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SHA3-256: cc61552b2353a591bba407c3fc0ac84ee893afb4fa17e694db219594370589c2
User & Date: lexi 2019-05-20 11:40:30
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2019-06-08
19:28
make conf script more portable check-in: 2bf816277f user: lexi tags: trunk
2019-05-20
11:40
initial commit check-in: cc61552b23 user: lexi tags: trunk
07:39
initial empty check-in check-in: 95af6ee31c user: lexi tags: trunk
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this license covers all files in this repository EXCEPT those in the "ext"
directory, which contains libraries written by other authors. see the
appropriate file for details.


                    GNU AFFERO GENERAL PUBLIC LICENSE

                       Version 3, 19 November 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
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  A contributor's "essential patent claims" are all patent claims
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  A patent license is "discriminatory" if it does not include within
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or that patent license was granted, prior to 28 March 2007.

  Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
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  12. No Surrender of Others' Freedom.

  If conditions are imposed on you (whether by court order, agreement or
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  13. Remote Network Interaction; Use with the GNU General Public License.

  Notwithstanding any other provision of this License, if you modify the
Program, your modified version must prominently offer all users
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  Notwithstanding any other provision of this License, you have
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  14. Revised Versions of this License.

  The Free Software Foundation may publish revised and/or new versions of
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Foundation.  If the Program does not specify a version number of the
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  If the Program specifies that a proxy can decide which future
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  Later license versions may give you additional or different
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  15. Disclaimer of Warranty.

  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

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  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
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USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
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            How to Apply These Terms to Your New Programs

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possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

Also add information on how to contact you by electronic and paper mail.

  If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source.  For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code.  There are many ways you could offer source, and different
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specific requirements.

  You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

Added README.md.



























































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# visnov

`visnov` is a lightweight visual-novel authoring toolchain intended as an (eventual) alternative to the bulky & overcomplicated ren'py. visnov does not involve any scripting languages or DSLs: it's just a binary library with some tooling, and the user can choose to implement her visual novel in whatever language she likes. want to make a line of dialogue conditional on the weather? link in [tenki](https://c.hale.su/lexi/util) and query the Dark Sky API.

this repository also includes a low-level binding to ocaml, intended to be used by user-defined functions that operate on native ocaml data structures appropriate to the specific game. those bindings are defined in `visnov.ml`

## build process

`visnov` has very few external dependencies. the only thing you should need to worry about is [libglfw3](https://glfw.org), though the `visnov` library itself does not require glfw to build.

glfw may be installed through your distribution's package manager or may be compiled from source. the latter is recommended if you wish to create a portable binary (which you probably should when you're ready to release your game.) when you compile your source code and link against glfw, you can do it either by specifying `-lglfw` to dynamically link or by adding `libglfw3.a` to the source list on the command line. (if you using a language other than C, you may need to specify the libraries differently. if your language comes with a default binding see `bind/$lang/build.md`)

once you have built the library and compiled your binary against you, you will need to store your assets in the binary. this is currently done with the `build/visnarc` tool.

visnarc generates a flat binary archive from a list of files on the command like. if you run, for instance, `visnarc font/reg.ttf font/bold.ttf player.png` it will print to standard output an archive containing those three files, using the entered paths as keys to access the data with. therefore, to archive a whole directory, you currently must `cd` to that directory, and then run `visnarc **` (if your shell, unlike `zsh` or `fish`, does not support recursive glob expansion, you may need to use the `find` command with `xargs` - this is best done from a shell script or makefile). in the future, visnarc should support a `-r` flag to set a directory as the archive root and then recurse into it; this is not currently a priority since it's already minimally functional.

the compiled binary will try to resolve files references from a `visnarc` archive appended to the end of the binary. the `>>` redirection operator is sufficient for these purposes; however, if you wish to keep a fileless copy (for instance, if you want to be able to update the assets without generating a new binary) you may instead wish to use a process like

    cc $files $flags -o novel-empty
	(cd assets; visnarc ** > ../assets.arc)
	cat novel-empty assets.arc > novel

this will provide greater flexibility, at the cost of disk space and build system complexity.

## license

`visnov` is licensed under the AGPL (see LICENSE). the external libraries in ext/ are not my intellectual property and have their own licenses. per the AGPL, `visnov` binaries may be sold for profit, but *only* if the source code (to both the `visnov` engine *and* the game built with it) is made freely available. closed-source development with `visnov` is not permitted, though i might be convinced to grant commercial licenses on a case-by-case basis to low-income folks who genuinely need the money.

note that you are bound by the licenses of *ALL* code you compile statically into your binary.

Added conf.sh.



























































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#!/usr/bin/bash

cc="clang"
ocamlc="ocamlopt.opt"
cflags="-std=c++14 -Iext/soil/ -Iext/fontstash/ -fno-rtti -fno-exceptions -g"
ldflags="-cclib \"-lglfw -lGL\""
prod=$(basename $(pwd))
echo "all: tools link"
csrc=""
for x in csrc/*.cc; do
	bx=$(basename $x).o
	$cc $cflags -MM $x -MT $bx
	echo "	$cc -c $cflags $x -o build/$bx"
	csrc="$csrc $bx"
done

echo "link: $csrc soil fontstash"
echo "	ar -rcs build/libvisnov.a build/*.o"
echo "	$ocamlc -c build/libvisnov.a mlsrc/*.ml $ldflags"
echo "	mv mlsrc/*.cmx mlsrc/*.cmi build/"
echo "	cp mlsrc/*.ml build/"
echo "soil:"
echo "	cd build && clang -c ../ext/soil/*.c"
echo "fontstash:"
echo "	cd build && clang -c ../ext/fontstash/*.c"
echo "tools:"
echo "	cd build && clang -std=c++14 ../tool/visnarc.cc -o visnarc"
echo "clean:"
echo "	rm build/*"

Added csrc/tbox.cc.





























































































































































































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struct strsplit {
	size_t elts = 0;
	char** words;
	char* mem;
	char* original;
	static bool isws(char c) { return (c == ' ') or (c == '\t') or (c == '\n'); }
		/* TODO: ~unicode~ */
	void split(const char* str) {
		size_t len;
		/* figure out how much memory we need */ {
			bool space = true; const char* cur; 
			for (cur = str; *cur!=0; ++cur)
				if (space and not isws(*cur)) space = false, ++elts;
					else if (isws(*cur) and not space) space = true;
			len = cur - str;
		}
		/* TODO: stop malloc 2k17 */
		mem = new char[len+1];
		words = new char*[elts];
		original = strdup(str);
		char** wcur = words;
		bool newelt = true;
		for(char* cur = mem;*str!=0;++str, ++cur) {
			if (newelt and isws(*str)) *cur=0;
			else if (newelt) {
				*wcur ++= cur;
				newelt = false;
				*cur = *str;
			} else if (isws(*str)) *cur = 0, newelt = true;
			else *cur = *str;
		}
		mem[len] = 0;
		elts = wcur - words;
	}
	void del() {
		elts = 0;
		delete words;
		delete mem;
		delete original;
	}
};
const float linespace = 5;
float tboxh(sth_stash* ctx, int font, float size, float w, const strsplit& str, float* out_w) {
	float lw = 0;
	for (size_t i = 0; i<str.elts; ++i) {
		float x1, x2, y1, y2;
		sth_dim_text(ctx, font, size, str.words[i], &x1, &y1, &x2, &y2);
		lw += (x2-x1) + 7;
	}
	if (lw <= w) { *out_w =  lw; return size; }
	*out_w = w;
	float h = size + linespace;
	while(lw > w) {
		h += size + linespace;
		lw -= w;
	}
	return h - linespace;
}
void tbox(sth_stash* ctx, int font, float size,
	uint16_t left, uint16_t top, uint16_t w,
	const strsplit& str) {
	float ypos = 0;
	float linew = 0;
	size_t linestart = 0;
	float ww[str.elts]; // lick my clit, malloc
	for (size_t i = 0; i<str.elts; ++i) {
		float x1, x2, y1, y2;
		sth_dim_text(ctx, font, size, str.words[i], &x1, &y1, &x2, &y2);
		ww[i] = x2 - x1;
		float potential_wspace = (w - (linew+ww[i])) / (i - (linestart));
		if ((potential_wspace < 7) or (linew + ww[i] > w)) {
			/* render this line, start a new one */
			float cur = 0;
			float wspace = (w - linew) / (i - (linestart+1));
			for (size_t j = linestart; j<i; ++j) {
				float _;
				sth_draw_text(ctx, font, size, left+cur, top-ypos, str.words[j], &_);
				cur += ww[j] + wspace;
			}
			linestart = i;
			ypos += (y2-y1) + linespace;
			linew = ww[i];
		} else {
			linew += ww[i];
		}
	}
	float cur = left;
	for (size_t j = linestart; j<str.elts; ++j) {
		float _;
		sth_draw_text(ctx, font, size, cur, top-ypos, str.words[j], &_);
		cur += ww[j] + 7;
	}
		
}

Added csrc/visnov.cc.



















































































































































































































































































































































































































































































































































































































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#include <GLFW/glfw3.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <SOIL.h>
extern "C" {
	#include <fontstash.h>
}

void* operator new(size_t sz) { return malloc(sz); }
void* operator new[](size_t sz) { return malloc(sz); }
void operator delete(void* ptr) noexcept { free(ptr); }
void operator delete[](void* ptr) noexcept { free(ptr); }

#include "tbox.cc"

namespace visnov {
	constexpr uint8_t max_pos = 8;
	struct frame { int16_t x, y; uint16_t w, h; };
	struct game;
	struct file {
		char* name;
		uint8_t* data;
		size_t len;
		
		enum class kind { none, image, font } filetype = kind::none;
		union {
			struct {
				uint16_t w, h;
				GLuint id;
			} img;
			int font;
		};
		
		void render(frame f) {
			glEnable(GL_TEXTURE_2D);
			glBindTexture(GL_TEXTURE_2D, img.id);
			glBegin(GL_QUADS);
				glTexCoord2f(0,1); glVertex2i(f.x,f.y);
				glTexCoord2f(1,1); glVertex2i(f.x+f.w,f.y);
				glTexCoord2f(1,0); glVertex2i(f.x+f.w,f.y+f.h);
				glTexCoord2f(0,0); glVertex2i(f.x,f.y+f.h);
			glEnd();
			glDisable(GL_TEXTURE_2D);
		}
		frame getframe (const game* g, uint8_t p);
	};
	struct text {
		strsplit str;
		uint32_t fg = 0, bg = 0xffFFff;
		file* font;
	};
	char* readstr(unsigned char** cur) {
		uint8_t len = **cur;
		char* strbuf = new char[len+1];
		for (uint8_t i = 0; i<len; ++i) {
			strbuf[i] = *++* cur;
		}
		++*cur;
		strbuf[len] = 0;
		return strbuf;
	}
	struct game {
		GLFWwindow* window;
		uint16_t width, height, cw, ch;
		file* bg = nullptr;
		uint8_t npos = 3;
		file* chars[max_pos] = {nullptr};
		text dlg[max_pos];
		sth_stash* fs = 0;
		bool pause = false;
		file* files; size_t filec;
		unsigned char* dat;
		void genlists() {
			const uint16_t ct = dat[0] | (dat [1] << 8);
			files = new file[ct];
			filec = ct;
			unsigned char* cur = dat + 2;
			for (size_t i = 0; i < ct; ++i) {
				files[i].name = readstr(&cur);
				files[i].data = dat + ((cur[0]) | (cur [1] << 8) | (cur[2] << 16) | (cur[3] << 24));
				cur+=4;
				files[i].len = ((cur[0]) | (cur [1] << 8) | (cur[2] << 16) | (cur[3] << 24));
				cur+=4;
			}
			
			for (size_t i = 0; i < ct; ++i) {
				files[i].data += cur-dat; // account for size of the file table
			}
		}
	};
	frame file::getframe (const game* g, uint8_t p) {
		const int16_t
			maxw = g -> cw / g -> npos, /* TODO padding? */
			x = maxw * p,
			xo = x+(maxw / 2 - img.w / 2);
		return { xo, 0, img.w, img.h }; /* TODO downscaling */
	};
	void resize(GLFWwindow* win, int w, int h) {
		game* g = (game*)glfwGetWindowUserPointer(win);
		g->cw=w;
		g->ch=h;
		glViewport(0,0,w,h);
		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		glOrtho(0,w,0,h,0,1);
		glMatrixMode(GL_MODELVIEW);
		glLoadIdentity();
	}
	void render(const game* g) {
		glClear(GL_COLOR_BUFFER_BIT);
		glfwMakeContextCurrent(g->window);
		glEnable(GL_BLEND);
		sth_begin_draw(g->fs);
		if (g -> bg) {
			const float wfac = float(g->cw) / g->width,
				hfac = float(g->ch) / g-> height,
				factor = (wfac > hfac) ? wfac : hfac;
			frame bgf = {0,0, uint16_t(float(g->bg->img.w) * factor),
				uint16_t(float(g->bg->img.h) * factor)};
			g -> bg -> render(bgf);
		}
		for (uint8_t i = 0; i < g->npos; ++i) {
			if (g -> chars[i]) {
				auto f = g -> chars[i] -> getframe(g, i);
				g -> chars[i] -> render(
					g -> chars[i] -> getframe(g, i));
			};
			const auto& d = g -> dlg[i];
			if (d.str.elts != 0) {
				const uint16_t pad = 15, fontsize = 32;
				const uint16_t col = g -> cw / g -> npos;
				float boxw;
				const uint16_t text_height = tboxh(g->fs, g->dlg[i].font->font,
					fontsize, col-pad*4, g->dlg[i].str, &boxw);
				const uint16_t top = text_height + ((g->chars[i] != nullptr) ?
					(g->chars[i]->img.h) + 20 : pad);
				const int16_t x1 = col*i + (col/2 - boxw/2), y1 = top - (text_height+pad),
					x2 = x1 + boxw + pad*2, y2 = top;
				glColor4ub(d.bg >> 16, (d.bg >> 8) & 0xFF, d.bg & 0xFF,200);
				glEnable(GL_MULTISAMPLE);
				glBegin(GL_POLYGON);
					glVertex2i((x1 + (x2-x1)/2) - 10,y1);
					glVertex2i((x1 + (x2-x1)/2), y1 - 20);
					glVertex2i((x1 + (x2-x1)/2) + 10,y1);
					glVertex2i(x2,y1);
					glVertex2i(x2,y2);
					glVertex2i(x1,y2);
					glVertex2i(x1,y1);
				glEnd();
				glColor3ub(d.fg >> 16, (d.fg >> 8) & 0xFF, d.fg & 0xFF);
				glBegin(GL_LINE_STRIP);
					glVertex2i(x1,y1);
					glVertex2i((x1 + (x2-x1)/2) - 10,y1);
					glVertex2i((x1 + (x2-x1)/2), y1 - 20);
					glVertex2i((x1 + (x2-x1)/2) + 10,y1);
					glVertex2i(x2,y1);
					glVertex2i(x2,y2);
					glVertex2i(x1,y2);
					glVertex2i(x1,y1);
				glEnd();
				glDisable(GL_MULTISAMPLE);
				float x;
				glColor3ub(d.fg >> 16, (d.fg >> 8) & 0xFF, d.fg & 0xFF);
				tbox(g->fs, g->dlg[i].font->font, fontsize, x1+pad, top-fontsize, col-pad*4,
					g->dlg[i].str);
				glColor3ub(255,255,255);
			}
		}
		sth_end_draw(g->fs);
		glDisable(GL_BLEND);
		
		glfwSwapBuffers(g->window);
	}
	void onclick(GLFWwindow* win, int button, int action, int mods) {
		if (action == GLFW_RELEASE and button == 0)
			((game*)glfwGetWindowUserPointer(win))->pause=false;
	}
	extern "C" {
		game* visnov_init(const char* gname, const char* str, int w, int h) {
			w>>=1; h>>=1;
			game* g = new game;
			g->width=w;
			g->height=h;
			FILE* f = fopen(gname, "rb");
			fseek(f,0,SEEK_END);
			long len = ftell(f);
			fseek(f,len-7,SEEK_SET);
			unsigned char buf[7];
			fread(buf,1,7,f);
			if (buf[4] == 0x9e and buf[5] == 0xcf and buf[6] == 0x44) {
				size_t sz = (buf[0]) | (buf [1] << 8) | (buf[2] << 16) | (buf [3] << 24);
				fseek(f,len-(sz+7),SEEK_SET);
				long arcsz = len-ftell(f);
				g -> dat = new unsigned char[arcsz];
				fread(g -> dat,arcsz,1,f);
				fclose(f);
				g -> genlists();
			} else {
				printf("\x1b[31;1merror:\x1b[0m cannot read resource pack\n");
				exit(1);
			}
			
			glfwInit();
			glfwWindowHint(GLFW_SAMPLES, 8);
			g -> window = glfwCreateWindow(w,h,str,nullptr,nullptr);
			glfwSetMouseButtonCallback(g->window,onclick);
			glfwMakeContextCurrent(g->window);
			g -> fs = sth_create(512,512);
			if (g->fs == 0) {
				printf("\x1b[31;1merror:\x1b[0m cannot init fontstash\n");
			}
			glfwSetWindowUserPointer(g->window,g);
			glClearColor(0,0,0,1);
			glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
			glBlendEquation(GL_FUNC_ADD);
			glfwSetWindowSizeCallback(g->window,resize);
			resize(g->window,w,h);
			return g;
		}
		void visnov_exit() {
			glfwTerminate();
		}
		
		file* visnov_fnt(game* g, const char* name) {
			for(uint16_t i = 0; i<g->filec; ++i) {
				if(strcmp(name,g->files[i].name)) continue;
				if(g->files[i].filetype==file::kind::none) {
					g->files[i].filetype = file::kind::font;
					g->files[i].font = sth_add_font_from_memory(g->fs, g->files[i].data);
					if (g->files[i].font < 0) {
						printf("\x1b[31;1mruntime error: \x1b[0m file \x1b[1m%s\x1b[0m is not a TTF\n",name);
						exit(2);
					}
				}
				return g->files + i;
			}
			printf("\x1b[31;1mruntime error: \x1b[0m font \x1b[1m%s\x1b[0m does not exist\n",name);
			exit(2);
		}
		
		file* visnov_img(game* g, const char* name) {
			for(uint16_t i = 0; i<g->filec; ++i) {
				if(strcmp(name,g->files[i].name)) continue;
				if (g->files[i].filetype==file::kind::none) {
					g->files[i].filetype = file::kind::image;
					int iw, ih;
					g->files[i].img.id = SOIL_load_OGL_texture_from_memory(
						/* address */ g->files[i].data,
						/* length */ g->files[i].len,
						/* force channels */ 4,
						/* reuse id */ 0,
						/* flags */ SOIL_LOAD_RGBA,
						/* MODIFICATION */ &iw, &ih
					);
					g->files[i].img.w=iw, g->files[i].img.h = ih;
					/*printf(" - %s [%zx ~ %zx] (%x)\n",
						g->files[i].name,
						g->files[i].data-g->dat, 
						(g->files[i].data-g->dat)+g->files[i].len,
						g->files[i].id);*/
				}
				return g->files + i;
			}
			printf("\x1b[31;1mruntime error: \x1b[0m image \x1b[1m%s\x1b[0m does not exist\n",name);
			exit(2);
		}
		void visnov_chr(game* g, int p, file* i) { g->chars[p>>1] = i; }
		void visnov_bg(game* g, file* i) { g->bg = i; }
		void visnov_layout(game* g, int l) { g -> npos = l >> 1; }
		void visnov_setfont(game* g, int pos, file* font) { g -> dlg[pos>>1].font = font; }
		void visnov_color(game* g, int pos, int fg, int bg) {
			g->dlg[pos>>1].fg = fg >> 1;
			g->dlg[pos>>1].bg = bg >> 1;
		}
		void visnov_block(game* g) {
			g->pause = true;
			int font = visnov_fnt(g,"font/comic/regular.ttf")->font;
			while(g->pause) {
				render(g);
				glfwPollEvents();
				if (glfwWindowShouldClose(g->window)) {
					/* uuuugh this is so hacky */
					glfwTerminate();
					exit(0);
				}
			}
		}
		void visnov_say(game* g, int pos, const char* str) {
			pos >>= 1;
			text& tx = g -> dlg[pos];
			if (tx.str.elts != 0) tx.str.del();
			tx.str.split(str);
		}
	}
}

Added ext/fontstash/Makefile.































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PROGRAM = fontstash
C_FILES := $(wildcard *.c)
CC = gcc
CFLAGS = -std=c99 -Wall -pedantic -Wno-unused-but-set-variable
CFLAGS += `sdl-config --cflags` `pkg-config --cflags SDL_image`
LDFLAGS = `sdl-config --libs` `pkg-config --libs SDL_image` -lGL -lm

all:
	$(CC) -o bin/$(PROGRAM) $(CFLAGS) $(C_FILES) $(LDFLAGS)

debug:
	$(CC) -o bin/$(PROGRAM) -ggdb $(CFLAGS) $(C_FILES) $(LDFLAGS)

run: all
	cd bin && ./$(PROGRAM)

Added ext/fontstash/README.md.





























































































































































































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# Font Stash: Dynamic font glyph cache for OpenGL

Font Stash enables easy string rendering in OpenGL applications. It supports truetype fonts and UTF-8 encoded localized strings. All glyphs are cached in OpenGL texture atlases. Font rasterization is done using Sean Barrett's [stb_truetype.h](http://nothings.org/).

Font Stash was originally created and [published](http://digestingduck.blogspot.com/2009/08/font-stash.html) by [Mikko Mononen](http://digestingduck.blogspot.com).

## Major changes to the original version

* Bitmap font support
* Truetype font loading from memory
* Added ability to load an arbitrary number of fonts (not just four)
* Use multiple OpenGL textures for glyph caching (not just one)

## Road map

* Freetype2 support (for glyph outlines)

## Screenshot

![Screenshot](https://github.com/akrinke/Font-Stash/wiki/screenshot.png)

## Usage

```c
#include "fontstash.h"

...
/* create a font stash with a maximum texture size of 512 x 512 */
struct sth_stash* stash = sth_create(512, 512);
/* load truetype font */
int droid = sth_add_font(stash, "DroidSerif-Regular.ttf");
/* position of the text */
float x = 10, y = 10;
...
/* draw text during your OpenGL render loop */
sth_begin_draw(stash);
/* position: (x, y); font size: 24 */
sth_draw_text(stash, droid, 24.0f, x, y, "Hello world!", &x);
/* now, the float x contains the x position of the next char */
sth_end_draw(stash);
... 

```

## Bitmap fonts

Bitmap fonts can be generated using the [AngelCode Bitmap Font Generator](http://www.angelcode.com/products/bmfont/). It's a Windows program that runs under Linux using Wine. This program generates one or more image files and a text file (*.fnt) containing the bounding box coordinates of all individual glyphs. These coordinates are used to reference the glyphs using Font Stash.

## License

The files fontstash.c, fontstash.h and main.c are licensed unter the zlib license:

    Copyright (c) 2011 Andreas Krinke andreas.krinke@gmx.de
    Copyright (c) 2009 Mikko Mononen memon@inside.org

    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.

For UTF-8 decoding, Font Stash uses Björn Höhrmann's [Flexible and Economical UTF-8 Decoder](http://bjoern.hoehrmann.de/utf-8/decoder/dfa/) (included in fontstash.c).
His code is licensed under the MIT license:

    Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
    THE SOFTWARE.
    
Finally, Font Stash uses Sean Barrett's public domain truetype font rasterizer [stb_truetype.h](http://nothings.org/).

Added ext/fontstash/bin/DroidSansJapanese.ttf.

cannot compute difference between binary files

Added ext/fontstash/bin/DroidSerif-Bold.ttf.

cannot compute difference between binary files

Added ext/fontstash/bin/DroidSerif-Italic.ttf.

cannot compute difference between binary files

Added ext/fontstash/bin/DroidSerif-Regular.ttf.

cannot compute difference between binary files

Added ext/fontstash/bin/NOTICE.





























































































































































































































































































































































































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   Copyright (c) 2005-2008, The Android Open Source Project

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.


                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

   1. Definitions.

      "License" shall mean the terms and conditions for use, reproduction,
      and distribution as defined by Sections 1 through 9 of this document.

      "Licensor" shall mean the copyright owner or entity authorized by
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      "Work" shall mean the work of authorship, whether in Source or
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      copyright notice that is included in or attached to the work
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      "Derivative Works" shall mean any work, whether in Source or Object
      form, that is based on (or derived from) the Work and for which the
      editorial revisions, annotations, elaborations, or other modifications
      represent, as a whole, an original work of authorship. For the purposes
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      separable from, or merely link (or bind by name) to the interfaces of,
      the Work and Derivative Works thereof.

      "Contribution" shall mean any work of authorship, including
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      "Contributor" shall mean Licensor and any individual or Legal Entity
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   2. Grant of Copyright License. Subject to the terms and conditions of
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      copyright license to reproduce, prepare Derivative Works of,
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      Work and such Derivative Works in Source or Object form.

   3. Grant of Patent License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      (except as stated in this section) patent license to make, have made,
      use, offer to sell, sell, import, and otherwise transfer the Work,
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      as of the date such litigation is filed.

   4. Redistribution. You may reproduce and distribute copies of the
      Work or Derivative Works thereof in any medium, with or without
      modifications, and in Source or Object form, provided that You
      meet the following conditions:

      (a) You must give any other recipients of the Work or
          Derivative Works a copy of this License; and

      (b) You must cause any modified files to carry prominent notices
          stating that You changed the files; and

      (c) You must retain, in the Source form of any Derivative Works
          that You distribute, all copyright, patent, trademark, and
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          within a display generated by the Derivative Works, if and
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          of the NOTICE file are for informational purposes only and
          do not modify the License. You may add Your own attribution
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          that such additional attribution notices cannot be construed
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      for use, reproduction, or distribution of Your modifications, or
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      this License, without any additional terms or conditions.
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      the terms of any separate license agreement you may have executed
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      whether in tort (including negligence), contract, or otherwise,
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      negligent acts) or agreed to in writing, shall any Contributor be
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   END OF TERMS AND CONDITIONS

Added ext/fontstash/bin/README.txt.





































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Copyright (C) 2008 The Android Open Source Project

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
  
     http://www.apache.org/licenses/LICENSE-2.0
  
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

##########

This directory contains the fonts for the platform. They are licensed
under the Apache 2 license.

Added ext/fontstash/bin/dejavu-sans.bmfc.











































































































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# AngelCode Bitmap Font Generator configuration file
fileVersion=1

# font settings
fontName=DejaVu Sans
charSet=0
fontSize=18
aa=1
scaleH=100
useSmoothing=1
isBold=1
isItalic=0
useUnicode=1
disableBoxChars=1
outputInvalidCharGlyph=0

# character alignment
paddingDown=0
paddingUp=0
paddingRight=0
paddingLeft=0
spacingHoriz=1
spacingVert=1
useFixedHeight=0

# output file
outWidth=512
outHeight=512
outBitDepth=8
fontDescFormat=0
fourChnlPacked=0
textureFormat=png
textureCompression=0
alphaChnl=0
redChnl=4
greenChnl=4
blueChnl=4
invA=0
invR=0
invG=0
invB=0

# outline
outlineThickness=0

# selected chars
chars=32-126,160-591,880-887,890-894,900-906,908,910-929,931-1309,1312-1317,1542-1543,1545-1546,1548,1557
chars=1563,1567,1569-1594,1600-1621,1623,1626,1632-1648,1652,1657-1727,1734,1740,1742,1749,1776-1785,8192
chars=8193-8292,8298-8305,8308-8334,8336-8340,8352-8373,8376-8377,8592-8703,9632-9884,9888-9912,9920-9923
chars=9985-9988,9990-9993,9996-10023,10025-10059,10061,10063-10066,10070,10072-10078,10081-10132,10136
chars=10137-10159,10161-10174

# imported icon images

Added 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kerning first=196 second=87  amount=-1  
kerning first=196 second=89  amount=-1  
kerning first=196 second=118 amount=-1  
kerning first=196 second=121 amount=-1  
kerning first=317 second=84  amount=-3  
kerning first=317 second=79  amount=-1  
kerning first=313 second=8221 amount=-4  
kerning first=313 second=8217 amount=-4  
kerning first=196 second=221 amount=-1  
kerning first=196 second=253 amount=-1  
kerning first=196 second=255 amount=-1  
kerning first=196 second=354 amount=-1  
kerning first=196 second=356 amount=-1  
kerning first=313 second=376 amount=-2  
kerning first=313 second=366 amount=-1  
kerning first=313 second=356 amount=-3  
kerning first=313 second=338 amount=-1  
kerning first=313 second=255 amount=-1  
kerning first=196 second=372 amount=-1  
kerning first=196 second=374 amount=-1  
kerning first=196 second=375 amount=-1  
kerning first=196 second=376 amount=-1  
kerning first=196 second=538 amount=-1  
kerning first=196 second=562 amount=-1  
kerning first=196 second=563 amount=-1  
kerning first=313 second=253 amount=-1  
kerning first=313 second=221 amount=-2  
kerning first=313 second=220 amount=-1  
kerning first=313 second=219 amount=-1  
kerning first=196 second=8217 amount=-1  
kerning first=196 second=8218 amount=1   
kerning first=196 second=8221 amount=-1  
kerning first=196 second=8222 amount=1   
kerning first=313 second=218 amount=-1  
kerning first=313 second=217 amount=-1  
kerning first=313 second=216 amount=-1  
kerning first=313 second=214 amount=-1  
kerning first=313 second=213 amount=-1  
kerning first=313 second=212 amount=-1  
kerning first=313 second=211 amount=-1  
kerning first=313 second=210 amount=-1  
kerning first=199 second=8217 amount=1   
kerning first=199 second=8221 amount=1   
kerning first=313 second=121 amount=-1  
kerning first=208 second=89  amount=-1  
kerning first=208 second=221 amount=-1  
kerning first=208 second=374 amount=-1  
kerning first=208 second=376 amount=-1  
kerning first=208 second=562 amount=-1  
kerning first=313 second=89  amount=-2  
kerning first=313 second=87  amount=-1  
kerning first=313 second=86  amount=-2  
kerning first=313 second=85  amount=-1  
kerning first=313 second=84  amount=-3  
kerning first=313 second=79  amount=-1  
kerning first=272 second=562 amount=-1  
kerning first=272 second=376 amount=-1  
kerning first=210 second=88  amount=-1  
kerning first=210 second=89  amount=-1  
kerning first=272 second=374 amount=-1  
kerning first=272 second=221 amount=-1  
kerning first=272 second=89  amount=-1  
kerning first=270 second=562 amount=-1  
kerning first=270 second=376 amount=-1  
kerning first=210 second=221 amount=-1  
kerning first=210 second=376 amount=-1  
kerning first=270 second=374 amount=-1  
kerning first=270 second=221 amount=-1  
kerning first=270 second=89  amount=-1  
kerning first=268 second=8221 amount=1   
kerning first=268 second=8217 amount=1   
kerning first=211 second=88  amount=-1  
kerning first=211 second=89  amount=-1  
kerning first=266 second=8221 amount=1   
kerning first=266 second=8217 amount=1   
kerning first=264 second=8221 amount=1   
kerning first=264 second=8217 amount=1   
kerning first=262 second=8221 amount=1   
kerning first=211 second=221 amount=-1  
kerning first=211 second=376 amount=-1  
kerning first=262 second=8217 amount=1   
kerning first=260 second=8222 amount=1   
kerning first=260 second=8221 amount=-1  
kerning first=260 second=8218 amount=1   
kerning first=260 second=8217 amount=-1  
kerning first=212 second=88  amount=-1  
kerning first=212 second=89  amount=-1  
kerning first=260 second=563 amount=-1  
kerning first=260 second=562 amount=-1  
kerning first=260 second=538 amount=-1  
kerning first=260 second=376 amount=-1  
kerning first=260 second=375 amount=-1  
kerning first=212 second=221 amount=-1  
kerning first=212 second=376 amount=-1  
kerning first=260 second=374 amount=-1  
kerning first=260 second=372 amount=-1  
kerning first=260 second=356 amount=-1  
kerning first=260 second=354 amount=-1  
kerning first=260 second=255 amount=-1  
kerning first=213 second=88  amount=-1  
kerning first=213 second=89  amount=-1  
kerning first=260 second=253 amount=-1  
kerning first=260 second=221 amount=-1  
kerning first=260 second=121 amount=-1  
kerning first=260 second=118 amount=-1  
kerning first=260 second=89  amount=-1  
kerning first=213 second=221 amount=-1  
kerning first=213 second=376 amount=-1  
kerning first=260 second=87  amount=-1  
kerning first=260 second=86  amount=-1  
kerning first=260 second=84  amount=-1  
kerning first=258 second=8222 amount=1   
kerning first=258 second=8221 amount=-1  
kerning first=214 second=88  amount=-1  
kerning first=214 second=89  amount=-1  
kerning first=258 second=8218 amount=1   
kerning first=258 second=8217 amount=-1  
kerning first=258 second=563 amount=-1  
kerning first=258 second=562 amount=-1  
kerning first=258 second=538 amount=-1  
kerning first=214 second=221 amount=-1  
kerning first=214 second=376 amount=-1  
kerning first=258 second=376 amount=-1  
kerning first=258 second=375 amount=-1  
kerning first=258 second=374 amount=-1  
kerning first=258 second=372 amount=-1  
kerning first=258 second=356 amount=-1  
kerning first=216 second=88  amount=-1  
kerning first=258 second=354 amount=-1  
kerning first=258 second=255 amount=-1  
kerning first=258 second=253 amount=-1  
kerning first=258 second=221 amount=-1  
kerning first=258 second=121 amount=-1  
kerning first=258 second=118 amount=-1  
kerning first=258 second=89  amount=-1  
kerning first=258 second=87  amount=-1  
kerning first=258 second=86  amount=-1  
kerning first=258 second=84  amount=-1  
kerning first=256 second=8222 amount=1   
kerning first=256 second=8221 amount=-1  
kerning first=256 second=8218 amount=1   
kerning first=256 second=8217 amount=-1  
kerning first=256 second=563 amount=-1  
kerning first=256 second=562 amount=-1  
kerning first=256 second=538 amount=-1  
kerning first=256 second=376 amount=-1  
kerning first=256 second=375 amount=-1  
kerning first=256 second=374 amount=-1  
kerning first=256 second=372 amount=-1  
kerning first=256 second=356 amount=-1  
kerning first=256 second=354 amount=-1  
kerning first=256 second=255 amount=-1  
kerning first=256 second=253 amount=-1  
kerning first=256 second=221 amount=-1  
kerning first=256 second=121 amount=-1  
kerning first=256 second=118 amount=-1  
kerning first=256 second=89  amount=-1  
kerning first=256 second=87  amount=-1  
kerning first=256 second=86  amount=-1  
kerning first=256 second=84  amount=-1  
kerning first=221 second=44  amount=-3  
kerning first=221 second=45  amount=-2  
kerning first=221 second=46  amount=-3  
kerning first=221 second=58  amount=-1  
kerning first=221 second=59  amount=-1  
kerning first=221 second=65  amount=-1  
kerning first=221 second=67  amount=-1  
kerning first=221 second=79  amount=-1  
kerning first=221 second=97  amount=-1  
kerning first=221 second=101 amount=-1  
kerning first=221 second=111 amount=-1  
kerning first=221 second=117 amount=-1  
kerning first=221 second=192 amount=-1  
kerning first=221 second=193 amount=-1  
kerning first=221 second=194 amount=-1  
kerning first=221 second=195 amount=-1  
kerning first=221 second=196 amount=-1  
kerning first=221 second=199 amount=-1  
kerning first=221 second=210 amount=-1  
kerning first=221 second=211 amount=-1  
kerning first=221 second=212 amount=-1  
kerning first=221 second=213 amount=-1  
kerning first=221 second=214 amount=-1  
kerning first=255 second=46  amount=-1  
kerning first=221 second=224 amount=-1  
kerning first=221 second=225 amount=-1  
kerning first=221 second=226 amount=-1  
kerning first=221 second=227 amount=-1  
kerning first=221 second=228 amount=-1  
kerning first=221 second=229 amount=-1  
kerning first=221 second=230 amount=-1  
kerning first=221 second=232 amount=-1  
kerning first=221 second=233 amount=-1  
kerning first=221 second=234 amount=-1  
kerning first=221 second=235 amount=-1  
kerning first=221 second=242 amount=-1  
kerning first=221 second=243 amount=-1  
kerning first=221 second=244 amount=-1  
kerning first=221 second=245 amount=-1  
kerning first=221 second=246 amount=-1  
kerning first=221 second=248 amount=-1  
kerning first=221 second=249 amount=-1  
kerning first=221 second=250 amount=-1  
kerning first=221 second=251 amount=-1  
kerning first=221 second=252 amount=-1  
kerning first=221 second=262 amount=-1  
kerning first=221 second=268 amount=-1  
kerning first=221 second=283 amount=-1  
kerning first=221 second=338 amount=-1  
kerning first=221 second=339 amount=-1  
kerning first=221 second=367 amount=-1  
kerning first=221 second=8218 amount=-3  
kerning first=221 second=8222 amount=-2  
kerning first=255 second=44  amount=-1  
kerning first=253 second=46  amount=-1  
kerning first=253 second=44  amount=-1  

Added ext/fontstash/bin/dejavu-sans_0.png.

cannot compute difference between binary files

Added ext/fontstash/bin/fontstash.

cannot compute difference between binary files

Added ext/fontstash/example.ex.



























































































































































































































































































































































































































































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//
// Copyright (c) 2011 Andreas Krinke andreas.krinke@gmx.de
// Copyright (c) 2009 Mikko Mononen memon@inside.org
//
// This software is provided 'as-is', without any express or implied
// warranty.  In no event will the authors be held liable for any damages
// arising from the use of this software.
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would be
//    appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
//    misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
//

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "SDL.h"
#include "SDL_image.h"

#ifdef __MACOSX__
#include "SDL_Opengl.h"
#else
#include "SDL_opengl.h"
#endif

#include "fontstash.h"

int main(int argc, char *argv[])
{
	int done;
	SDL_Event event;
	SDL_Surface* screen;
	int width, height;
	struct sth_stash* stash = 0;
	FILE* fp = 0;
	int datasize;
	unsigned char* data;
	float sx,sy,dx,dy,lh;
	int droidRegular, droidItalic, droidBold, droidJapanese, dejavu;
	SDL_Surface* surface;
	GLuint texture;

	if (SDL_Init(SDL_INIT_EVERYTHING) < 0)
	{
		fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
		return -1;
	}



	// Init OpenGL
	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
	SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);

	width = 800;
	height = 600;	
	screen = SDL_SetVideoMode(width, height, 0, SDL_OPENGL);
	if (!screen)
	{
		fprintf(stderr, "Could not initialise SDL opengl\n");
		return -1;
	}
	
	SDL_WM_SetCaption("FontStash Demo", 0);

	stash = sth_create(512,512);
	if (!stash)
	{
		fprintf(stderr, "Could not create stash.\n");
		return -1;
	}

	// Load the first truetype font from memory (just because we can).
	fp = fopen("DroidSerif-Regular.ttf", "rb");
	if (!fp) goto error_add_font;
	fseek(fp, 0, SEEK_END);
	datasize = (int)ftell(fp);
	fseek(fp, 0, SEEK_SET);
	data = (unsigned char*)malloc(datasize);
	if (data == NULL) goto error_add_font;
	fread(data, 1, datasize, fp);
	fclose(fp);
	fp = 0;
	
	if (!(droidRegular = sth_add_font_from_memory(stash, data)))
		goto error_add_font;

	// Load the remaining truetype fonts directly.
	if (!(droidItalic = sth_add_font(stash,"DroidSerif-Italic.ttf")))
		goto error_add_font;
	if (!(droidBold = sth_add_font(stash,"DroidSerif-Bold.ttf")))
		goto error_add_font;
	if (!(droidJapanese = sth_add_font(stash,"DroidSansJapanese.ttf")))
		goto error_add_font;

	// Load a bitmap font
	surface = IMG_Load("dejavu-sans_0.png");
	if (surface == NULL)
	{
		fprintf(stderr, "%s.\n", IMG_GetError());
		return -1;
	}
	glGenTextures(1, &texture);
	glBindTexture(GL_TEXTURE_2D, texture);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	if (SDL_MUSTLOCK(surface)) SDL_LockSurface(surface);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA8, surface->w, surface->h, 0, GL_ALPHA, GL_UNSIGNED_BYTE, surface->pixels);
	if (SDL_MUSTLOCK(surface)) SDL_UnlockSurface(surface);
	SDL_FreeSurface(surface);
	dejavu = sth_add_bitmap_font(stash, 17, -4, 2);
	sth_add_glyph_for_char(stash, dejavu, texture, "T", 18, 14, 363, 331, 10, 11, 0,  3, 10);
	sth_add_glyph_for_char(stash, dejavu, texture, "h", 18, 14, 225, 382,  8, 11, 1,  3, 10);
	sth_add_glyph_for_char(stash, dejavu, texture, "i", 18, 14, 478, 377,  2, 11, 1,  3,  4);
	sth_add_glyph_for_char(stash, dejavu, texture, "s", 18, 14, 199, 455,  7,  8, 1,  6,  9);
	sth_add_glyph_for_char(stash, dejavu, texture, " ", 18, 14,  66, 185,  1,  1, 0, 14,  5);
	sth_add_glyph_for_char(stash, dejavu, texture, "a", 18, 14,  18, 459,  8,  8, 1,  6, 10);
	sth_add_glyph_for_char(stash, dejavu, texture, "b", 18, 14, 198, 383,  8, 11, 1,  3, 10);
	sth_add_glyph_for_char(stash, dejavu, texture, "t", 18, 14, 436, 377,  5, 11, 1,  3,  6);
	sth_add_glyph_for_char(stash, dejavu, texture, "m", 18, 14, 494, 429, 12,  8, 2,  6, 16);
	sth_add_glyph_for_char(stash, dejavu, texture, "p", 18, 14, 436, 353,  8, 11, 1,  6, 10);
	sth_add_glyph_for_char(stash, dejavu, texture, "f", 18, 14, 442, 377,  5, 11, 1,  3,  7);
	sth_add_glyph_for_char(stash, dejavu, texture, "o", 18, 14, 483, 438,  8,  8, 1,  6, 10);
	sth_add_glyph_for_char(stash, dejavu, texture, "n", 18, 14,   0, 459,  8,  8, 1,  6, 10);
	sth_add_glyph_for_char(stash, dejavu, texture, ".", 18, 14, 285, 476,  2,  3, 1, 11,  6);
	
	done = 0;
	while (!done)
	{
		while (SDL_PollEvent(&event))
		{
			switch (event.type)
			{
				case SDL_MOUSEMOTION:
					break;
				case SDL_MOUSEBUTTONDOWN:
					break;
				case SDL_KEYDOWN:
					if (event.key.keysym.sym == SDLK_ESCAPE)
						done = 1;
					break;
				case SDL_QUIT:
					done = 1;
					break;
				default:
					break;
			}
		}
		
		// Update and render
		glViewport(0, 0, width, height);
		glClearColor(0.3f, 0.3f, 0.32f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
		glEnable(GL_BLEND);
		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
		glDisable(GL_TEXTURE_2D);
		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		glOrtho(0,width,0,height,-1,1);
		glMatrixMode(GL_MODELVIEW);
		glLoadIdentity();
		glDisable(GL_DEPTH_TEST);
		glColor4ub(255,255,255,255);
		glEnable(GL_BLEND);
		glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);

		sx = 100; sy = 250;
		
		sth_begin_draw(stash);
		
		dx = sx; dy = sy;
		sth_draw_text(stash, droidRegular, 24.0f, dx, dy, "The quick ", &dx);
		sth_draw_text(stash, droidItalic, 48.0f, dx, dy, "brown ", &dx);
		sth_draw_text(stash, droidRegular, 24.0f, dx, dy, "fox ", &dx);
		sth_vmetrics(stash, droidItalic, 24, NULL, NULL, &lh);
		dx = sx;
		dy -= lh*1.2f;
		sth_draw_text(stash, droidItalic, 24.0f, dx, dy, "jumps over ", &dx);
		sth_draw_text(stash, droidBold, 24.0f, dx, dy, "the lazy ", &dx);
		sth_draw_text(stash, droidRegular, 24.0f, dx, dy, "dog.", &dx);
		dx = sx;
		dy -= lh*1.2f;
		sth_draw_text(stash, droidRegular, 12.0f, dx, dy, "Now is the time for all good men to come to the aid of the party.", &dx);
		sth_vmetrics(stash, droidItalic, 12, NULL, NULL, &lh);
		dx = sx;
		dy -= lh*1.2f*2;
		sth_draw_text(stash, droidItalic, 18.0f, dx, dy, "Ég get etið gler án þess að meiða mig.", &dx);
		sth_vmetrics(stash, droidItalic, 18, NULL, NULL, &lh);
		dx = sx;
		dy -= lh*1.2f;
		sth_draw_text(stash, droidJapanese, 18.0f, dx, dy, "私はガラスを食べられます。それは私を傷つけません。", &dx);
		dx = sx;
		dy -= lh*1.2f*2;
		sth_draw_text(stash, dejavu, 18.0f, dx, dy, "This is a bitmap font.", &dx);

		sth_end_draw(stash);
		
		glEnable(GL_DEPTH_TEST);
		SDL_GL_SwapBuffers();
	}
	
	sth_delete(stash);
	free(data);
	SDL_Quit();
	return 0;

error_add_font:
	fprintf(stderr, "Could not add font.\n");
	return -1;
}

Added ext/fontstash/fontstash.c.































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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//
// Copyright (c) 2011-2013 Andreas Krinke andreas.krinke@gmx.de
// Copyright (c) 2009 Mikko Mononen memon@inside.org
//
// This software is provided 'as-is', without any express or implied
// warranty.  In no event will the authors be held liable for any damages
// arising from the use of this software.
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would be
//    appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
//    misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
//

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h> /* @rlyeh: floorf() */

#include <GL/glew.h>  /* @rlyeh: before including GL. doesnt hurt and makes life better */

#ifdef __MACOSX__
#include <OpenGL/gl.h>
#else
#include <GL/gl.h>
#endif

/* @rlyeh: removed STB_TRUETYPE_IMPLENTATION. We link it externally */
#include "stb_truetype.h"

#include "fontstash.h"

#define HASH_LUT_SIZE 256
#define MAX_ROWS 128
#define VERT_COUNT (6*128)
#define VERT_STRIDE (sizeof(float)*4)

#define TTFONT_FILE 1
#define TTFONT_MEM  2
#define BMFONT      3

static int idx = 1;

static unsigned int hashint(unsigned int a)
{
	a += ~(a<<15);
	a ^=  (a>>10);
	a +=  (a<<3);
	a ^=  (a>>6);
	a += ~(a<<11);
	a ^=  (a>>16);
	return a;
}


struct sth_quad
{
	float x0,y0,s0,t0;
	float x1,y1,s1,t1;
};

struct sth_row
{
	short x,y,h;
};

struct sth_glyph
{
	unsigned int codepoint;
	short size;
	struct sth_texture* texture;
	int x0,y0,x1,y1;
	float xadv,xoff,yoff;
	int next;
};

struct sth_font
{
	int idx;
	int type;
	stbtt_fontinfo font;
	unsigned char* data;
	struct sth_glyph* glyphs;
	int lut[HASH_LUT_SIZE];
	int nglyphs;
	float ascender;
	float descender;
	float lineh;
	struct sth_font* next;
};

struct sth_texture
{
	GLuint id;
	// TODO: replace rows with pointer
	struct sth_row rows[MAX_ROWS];
	int nrows;
	float verts[4*VERT_COUNT];
	int nverts;
	struct sth_texture* next;
};

struct sth_stash
{
	int tw,th;
	float itw,ith;
	GLubyte *empty_data;
	struct sth_texture* tt_textures;
	struct sth_texture* bm_textures;
	struct sth_font* fonts;
	int drawing;
};



// Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
// See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details.

#define UTF8_ACCEPT 0
#define UTF8_REJECT 1

static const unsigned char utf8d[] = {
	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 00..1f
	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 20..3f
	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 40..5f
	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 60..7f
	1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, // 80..9f
	7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, // a0..bf
	8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, // c0..df
	0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, // e0..ef
	0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, // f0..ff
	0x0,0x1,0x2,0x3,0x5,0x8,0x7,0x1,0x1,0x1,0x4,0x6,0x1,0x1,0x1,0x1, // s0..s0
	1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,0,1,0,1,1,1,1,1,1, // s1..s2
	1,2,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1, // s3..s4
	1,2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,3,1,1,1,1,1,1, // s5..s6
	1,3,1,1,1,1,1,3,1,3,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // s7..s8
};

static unsigned int decutf8(unsigned int* state, unsigned int* codep, unsigned int byte)
{
	unsigned int type = utf8d[byte];
	*codep = (*state != UTF8_ACCEPT) ?
		(byte & 0x3fu) | (*codep << 6) :
		(0xff >> type) & (byte);
	*state = utf8d[256 + *state*16 + type];
	return *state;
}



struct sth_stash* sth_create(int cachew, int cacheh)
{
	struct sth_stash* stash = NULL;
	GLubyte* empty_data = NULL;
	struct sth_texture* texture = NULL;

	// Allocate memory for the font stash.
	stash = (struct sth_stash*)malloc(sizeof(struct sth_stash));
	if (stash == NULL) goto error;
	memset(stash,0,sizeof(struct sth_stash));

	// Create data for clearing the textures
	empty_data = malloc(cachew * cacheh);
	if (empty_data == NULL) goto error;
	memset(empty_data, 0, cachew * cacheh);

	// Allocate memory for the first texture
	texture = (struct sth_texture*)malloc(sizeof(struct sth_texture));
	if (texture == NULL) goto error;
	memset(texture,0,sizeof(struct sth_texture));

	// Create first texture for the cache.
	stash->tw = cachew;
	stash->th = cacheh;
	stash->itw = 1.0f/cachew;
	stash->ith = 1.0f/cacheh;
	stash->empty_data = empty_data;
	stash->tt_textures = texture;
	glGenTextures(1, &texture->id);
	if (!texture->id) goto error;
	glBindTexture(GL_TEXTURE_2D, texture->id);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, cachew, cacheh, 0, GL_ALPHA, GL_UNSIGNED_BYTE, empty_data);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

	return stash;
	
error:
	if (stash != NULL)
		free(stash);
	if (empty_data != NULL)
		free(empty_data);
	if (texture != NULL)
		free(texture);
	return NULL;
}

int sth_add_font_from_memory(struct sth_stash* stash, unsigned char* buffer)
{
	int ret, i, ascent, descent, fh, lineGap;
	struct sth_font* fnt = NULL;

	fnt = (struct sth_font*)malloc(sizeof(struct sth_font));
	if (fnt == NULL) 
    {
        ret = STH_ENOMEM;
        goto error;
    }
	memset(fnt,0,sizeof(struct sth_font));

	// Init hash lookup.
	for (i = 0; i < HASH_LUT_SIZE; ++i) fnt->lut[i] = -1;

	fnt->data = buffer;

	// Init stb_truetype
	if (!stbtt_InitFont(&fnt->font, fnt->data, 0))
    {
        ret = STH_ETTFINIT;
        goto error;
    }
	
	// Store normalized line height. The real line height is got
	// by multiplying the lineh by font size.
	stbtt_GetFontVMetrics(&fnt->font, &ascent, &descent, &lineGap);
	fh = ascent - descent;
	fnt->ascender = (float)ascent / (float)fh;
	fnt->descender = (float)descent / (float)fh;
	fnt->lineh = (float)(fh + lineGap) / (float)fh;

	fnt->idx = idx;
	fnt->type = TTFONT_MEM;
	fnt->next = stash->fonts;
	stash->fonts = fnt;
	
	return idx++;

error:
	if (fnt) {
		if (fnt->glyphs) free(fnt->glyphs);
		free(fnt);
	}
	return ret;
}

int sth_add_font(struct sth_stash* stash, const char* path)
{
	FILE* fp = 0;
	int ret, datasize;
	unsigned char* data = NULL;
	int idx;
	
	// Read in the font data.
	fp = fopen(path, "rb");
	if (!fp)
    {
        ret = STH_EFILEIO;
        goto error;
    }
	fseek(fp,0,SEEK_END);
	datasize = (int)ftell(fp);
	fseek(fp,0,SEEK_SET);
	data = (unsigned char*)malloc(datasize);
	if (data == NULL)
    {
        ret = STH_ENOMEM;
        goto error;
    }
	fread(data, 1, datasize, fp);
	fclose(fp);
	fp = 0;
	
	idx = sth_add_font_from_memory(stash, data);
	// Modify type of the loaded font.
	if (idx)
		stash->fonts->type = TTFONT_FILE;
	else
		free(data);

	return idx;
	
error:
	if (data) free(data);
	if (fp) fclose(fp);
	return ret;
}

int sth_add_bitmap_font(struct sth_stash* stash, int ascent, int descent, int line_gap)
{
	int ret, i, fh;
	struct sth_font* fnt = NULL;

	fnt = (struct sth_font*)malloc(sizeof(struct sth_font));
	if (fnt == NULL)
    {
        ret = STH_ENOMEM;
        goto error;
    }
	memset(fnt,0,sizeof(struct sth_font));

	// Init hash lookup.
	for (i = 0; i < HASH_LUT_SIZE; ++i) fnt->lut[i] = -1;

	// Store normalized line height. The real line height is got
	// by multiplying the lineh by font size.
	fh = ascent - descent;
	fnt->ascender = (float)ascent / (float)fh;
	fnt->descender = (float)descent / (float)fh;
	fnt->lineh = (float)(fh + line_gap) / (float)fh;

	fnt->idx = idx;
	fnt->type = BMFONT;
	fnt->next = stash->fonts;
	stash->fonts = fnt;
	
	return idx++;

error:
	if (fnt) free(fnt);
	return ret;
}

int sth_add_glyph_for_codepoint(struct sth_stash* stash,
                                int idx,
                                GLuint id,
                                unsigned int codepoint,
                                short size, short base,
                                int x, int y, int w, int h,
                                float xoffset, float yoffset, float xadvance)
{
    struct sth_texture* texture = NULL;
	struct sth_font* fnt = NULL;
	struct sth_glyph* glyph = NULL;

	if (stash == NULL)
        return STH_EINVAL;
	texture = stash->bm_textures;
	while (texture != NULL && texture->id != id) texture = texture->next;
	if (texture == NULL)
	{
		// Create new texture
		texture = (struct sth_texture*)malloc(sizeof(struct sth_texture));
		if (texture == NULL)
            return STH_ENOMEM;
		memset(texture, 0, sizeof(struct sth_texture));
		texture->id = id;
		texture->next = stash->bm_textures;
		stash->bm_textures = texture;
	}

	fnt = stash->fonts;
	while (fnt != NULL && fnt->idx != idx) fnt = fnt->next;
	if (fnt == NULL)
        return STH_EINVAL;
	if (fnt->type != BMFONT)
        return STH_EINVAL;
	
	// Alloc space for new glyph.
	fnt->nglyphs++;
	fnt->glyphs = (struct sth_glyph *)realloc(fnt->glyphs, fnt->nglyphs*sizeof(struct sth_glyph)); /* @rlyeh: explicit cast needed in C++ */
	if (!fnt->glyphs)
        return STH_ENOMEM;

	// Init glyph.
	glyph = &fnt->glyphs[fnt->nglyphs-1];
	memset(glyph, 0, sizeof(struct sth_glyph));
	glyph->codepoint = codepoint;
	glyph->size = size;
	glyph->texture = texture;
	glyph->x0 = x;
	glyph->y0 = y;
	glyph->x1 = glyph->x0+w;
	glyph->y1 = glyph->y0+h;
	glyph->xoff = xoffset;
	glyph->yoff = yoffset - base;
	glyph->xadv = xadvance;
	
	// Find code point and size.
	h = hashint(codepoint) & (HASH_LUT_SIZE-1);
	// Insert char to hash lookup.
	glyph->next = fnt->lut[h];
	fnt->lut[h] = fnt->nglyphs-1;

    return STH_ESUCCESS;
}

inline int sth_add_glyph_for_char(struct sth_stash* stash,
                                  int idx,
                                  GLuint id,
                                  const char* s,
                                  short size, short base,
                                  int x, int y, int w, int h,
                                  float xoffset, float yoffset, float xadvance)
{
    unsigned int codepoint;
	unsigned int state = 0;
    
    for (; *s; ++s)
	{
		if (!decutf8(&state, &codepoint, *(unsigned char*)s))
            break;
	}
	if (state != UTF8_ACCEPT)
        return STH_EINVAL;
    
    return sth_add_glyph_for_codepoint(stash, idx, id, codepoint, size, base, x, y, w, h, xoffset, yoffset, xadvance);
}

static struct sth_glyph* get_glyph(struct sth_stash* stash, struct sth_font* fnt, unsigned int codepoint, short isize)
{
	int i,g,advance,lsb,x0,y0,x1,y1,gw,gh;
	float scale;
	struct sth_texture* texture = NULL;
	struct sth_glyph* glyph = NULL;
	unsigned char* bmp = NULL;
	unsigned int h;
	float size = isize/10.0f;
	int rh;
	struct sth_row* br = NULL;

	// Find code point and size.
	h = hashint(codepoint) & (HASH_LUT_SIZE-1);
	i = fnt->lut[h];
	while (i != -1)
	{
		if (fnt->glyphs[i].codepoint == codepoint && (fnt->type == BMFONT || fnt->glyphs[i].size == isize))
			return &fnt->glyphs[i];
		i = fnt->glyphs[i].next;
	}
	// Could not find glyph.
	
	// For bitmap fonts: ignore this glyph.
	if (fnt->type == BMFONT)
        return 0;
	
	// For truetype fonts: create this glyph.
	scale = stbtt_ScaleForPixelHeight(&fnt->font, size);
	g = stbtt_FindGlyphIndex(&fnt->font, codepoint);
	if(!g)
        return 0; /* @rlyeh: glyph not found, ie, arab chars */
	stbtt_GetGlyphHMetrics(&fnt->font, g, &advance, &lsb);
	stbtt_GetGlyphBitmapBox(&fnt->font, g, scale,scale, &x0,&y0,&x1,&y1);
	gw = x1-x0;
	gh = y1-y0;
	
	// Check if glyph is larger than maximum texture size
	if (gw >= stash->tw || gh >= stash->th)
		return 0;

	// Find texture and row where the glyph can be fit.
	br = NULL;
	rh = (gh+7) & ~7;
	texture = stash->tt_textures;
	while(br == NULL)
	{
		for (i = 0; i < texture->nrows; ++i)
		{
			if (texture->rows[i].h == rh && texture->rows[i].x+gw+1 <= stash->tw)
				br = &texture->rows[i];
		}
	
		// If no row is found, there are 3 possibilities:
		//   - add new row
		//   - try next texture
		//   - create new texture
		if (br == NULL)
		{
			short py = 0;
			// Check that there is enough space.
			if (texture->nrows)
			{
				py = texture->rows[texture->nrows-1].y + texture->rows[texture->nrows-1].h+1;
				if (py+rh > stash->th)
				{
					if (texture->next != NULL)
					{
						texture = texture->next;
					}
					else
					{
						// Create new texture
						texture->next = (struct sth_texture*)malloc(sizeof(struct sth_texture));
						texture = texture->next;
						if (texture == NULL) goto error;
						memset(texture,0,sizeof(struct sth_texture));
						glGenTextures(1, &texture->id);
						if (!texture->id) goto error;
						glBindTexture(GL_TEXTURE_2D, texture->id);
						glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, stash->tw,stash->th, 0, GL_ALPHA, GL_UNSIGNED_BYTE, stash->empty_data);
						glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
						glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
					}
					continue;
				}
			}
			// Init and add row
			br = &texture->rows[texture->nrows];
			br->x = 0;
			br->y = py;
			br->h = rh;
			texture->nrows++;	
		}
	}
	
	// Alloc space for new glyph.
	fnt->nglyphs++;
	fnt->glyphs = (struct sth_glyph *)realloc(fnt->glyphs, fnt->nglyphs*sizeof(struct sth_glyph)); /* @rlyeh: explicit cast needed in C++ */
	if (!fnt->glyphs)
        return 0;

	// Init glyph.
	glyph = &fnt->glyphs[fnt->nglyphs-1];
	memset(glyph, 0, sizeof(struct sth_glyph));
	glyph->codepoint = codepoint;
	glyph->size = isize;
	glyph->texture = texture;
	glyph->x0 = br->x;
	glyph->y0 = br->y;
	glyph->x1 = glyph->x0+gw;
	glyph->y1 = glyph->y0+gh;
	glyph->xadv = scale * advance;
	glyph->xoff = (float)x0;
	glyph->yoff = (float)y0;
	glyph->next = 0;

	// Advance row location.
	br->x += gw+1;
	
	// Insert char to hash lookup.
	glyph->next = fnt->lut[h];
	fnt->lut[h] = fnt->nglyphs-1;

	// Rasterize
	bmp = (unsigned char*)malloc(gw*gh);
	if (bmp)
	{
		stbtt_MakeGlyphBitmap(&fnt->font, bmp, gw,gh,gw, scale,scale, g);
		// Update texture
		glBindTexture(GL_TEXTURE_2D, texture->id);
		glPixelStorei(GL_UNPACK_ALIGNMENT,1);
		glTexSubImage2D(GL_TEXTURE_2D, 0, glyph->x0,glyph->y0, gw,gh, GL_ALPHA,GL_UNSIGNED_BYTE,bmp);
		free(bmp);
	}
	
	return glyph;

error:
	if (texture)
		free(texture);
	return 0;
}

static int get_quad(struct sth_stash* stash, struct sth_font* fnt, struct sth_glyph* glyph, short isize, float* x, float* y, struct sth_quad* q)
{
	int rx,ry;
	float scale = 1.0f;

	if (fnt->type == BMFONT) scale = isize/(glyph->size*10.0f);

	rx = floorf(*x + scale * glyph->xoff);
	ry = floorf(*y - scale * glyph->yoff);
	
	q->x0 = rx;
	q->y0 = ry;
	q->x1 = rx + scale * (glyph->x1 - glyph->x0);
	q->y1 = ry - scale * (glyph->y1 - glyph->y0);
	
	q->s0 = (glyph->x0) * stash->itw;
	q->t0 = (glyph->y0) * stash->ith;
	q->s1 = (glyph->x1) * stash->itw;
	q->t1 = (glyph->y1) * stash->ith;
	
	*x += scale * glyph->xadv;
	
	return 1;
}

static float* setv(float* v, float x, float y, float s, float t)
{
	v[0] = x;
	v[1] = y;
	v[2] = s;
	v[3] = t;
	return v+4;
}

static void flush_draw(struct sth_stash* stash)
{
	struct sth_texture* texture = stash->tt_textures;
	short tt = 1;
	while (texture)
	{
		if (texture->nverts > 0)
		{			
			glBindTexture(GL_TEXTURE_2D, texture->id);
			glEnable(GL_TEXTURE_2D);
			glEnableClientState(GL_VERTEX_ARRAY);
			glEnableClientState(GL_TEXTURE_COORD_ARRAY);
			glVertexPointer(2, GL_FLOAT, VERT_STRIDE, texture->verts);
			glTexCoordPointer(2, GL_FLOAT, VERT_STRIDE, texture->verts+2);
			glDrawArrays(GL_QUADS, 0, texture->nverts);
			glDisable(GL_TEXTURE_2D);
			glDisableClientState(GL_VERTEX_ARRAY);
			glDisableClientState(GL_TEXTURE_COORD_ARRAY);
			texture->nverts = 0;
		}
		texture = texture->next;
		if (!texture && tt)
		{
			texture = stash->bm_textures;
			tt = 0;
		}
	}
}

void sth_begin_draw(struct sth_stash* stash)
{
	if (stash == NULL)
        return;
	if (stash->drawing)
		flush_draw(stash);
	stash->drawing = 1;
}

void sth_end_draw(struct sth_stash* stash)
{
	if (stash == NULL)
        return;
	if (!stash->drawing)
        return;

/*
	// Debug dump.
	if (stash->nverts+6 < VERT_COUNT)
	{
		float x = 500, y = 100;
		float* v = &stash->verts[stash->nverts*4];

		v = setv(v, x, y, 0, 0);
		v = setv(v, x+stash->tw, y, 1, 0);
		v = setv(v, x+stash->tw, y+stash->th, 1, 1);

		v = setv(v, x, y, 0, 0);
		v = setv(v, x+stash->tw, y+stash->th, 1, 1);
		v = setv(v, x, y+stash->th, 0, 1);

		stash->nverts += 6;
	}
*/
	
	flush_draw(stash);
	stash->drawing = 0;
}

void sth_draw_text(struct sth_stash* stash,
				   int idx, float size,
				   float x, float y,
				   const char* s, float* dx)
{
	unsigned int codepoint;
	struct sth_glyph* glyph = NULL;
	struct sth_texture* texture = NULL;
	unsigned int state = 0;
	struct sth_quad q;
	short isize = (short)(size*10.0f);
	float* v;
	struct sth_font* fnt = NULL;
	
	if (stash == NULL)
        return;

	fnt = stash->fonts;
	while(fnt != NULL && fnt->idx != idx) fnt = fnt->next;
	if (fnt == NULL)
        return;
	if (fnt->type != BMFONT && !fnt->data)
        return;
	
	for (; *s; ++s)
	{
		if (decutf8(&state, &codepoint, *(unsigned char*)s))
            continue;
		glyph = get_glyph(stash, fnt, codepoint, isize);
		if (!glyph)
            continue;
		texture = glyph->texture;
		if (texture->nverts+4 >= VERT_COUNT)
			flush_draw(stash);
		
		if (!get_quad(stash, fnt, glyph, isize, &x, &y, &q))
            continue;
		
		v = &texture->verts[texture->nverts*4];
		
		v = setv(v, q.x0, q.y0, q.s0, q.t0);
		v = setv(v, q.x1, q.y0, q.s1, q.t0);
		v = setv(v, q.x1, q.y1, q.s1, q.t1);
		v = setv(v, q.x0, q.y1, q.s0, q.t1);
		
		texture->nverts += 4;
	}
	
	if (dx) *dx = x;
}

void sth_dim_text(struct sth_stash* stash,
				  int idx, float size,
				  const char* s,
				  float* minx, float* miny, float* maxx, float* maxy)
{
	unsigned int codepoint;
	struct sth_glyph* glyph = NULL;
	unsigned int state = 0;
	struct sth_quad q;
	short isize = (short)(size*10.0f);
	struct sth_font* fnt = NULL;
	float x = 0, y = 0;

	*minx = *maxx = *miny = *maxy = 0;	/* @rlyeh: reset vars before failing */

	if (stash == NULL)
        return;
	fnt = stash->fonts;
	while(fnt != NULL && fnt->idx != idx)
        fnt = fnt->next;
	if (fnt == NULL)
        return;
	if (fnt->type != BMFONT && !fnt->data)
        return;
	
	for (; *s; ++s)
	{
		if (decutf8(&state, &codepoint, *(unsigned char*)s))
            continue;
		glyph = get_glyph(stash, fnt, codepoint, isize);
		if (!glyph)
            continue;
		if (!get_quad(stash, fnt, glyph, isize, &x, &y, &q))
            continue;
		if (q.x0 < *minx) *minx = q.x0;
		if (q.x1 > *maxx) *maxx = q.x1;
		if (q.y1 < *miny) *miny = q.y1;
		if (q.y0 > *maxy) *maxy = q.y0;
	}
	if (floorf(x) > *maxx) *maxx = floorf(x);
}

void sth_vmetrics(struct sth_stash* stash,
				  int idx, float size,
				  float* ascender, float* descender, float* lineh)
{
	struct sth_font* fnt = NULL;

	if (stash == NULL)
        return;
	fnt = stash->fonts;
	while(fnt != NULL && fnt->idx != idx) fnt = fnt->next;
	if (fnt == NULL)
        return;
	if (fnt->type != BMFONT && !fnt->data)
        return;
	if (ascender)
		*ascender = fnt->ascender*size;
	if (descender)
		*descender = fnt->descender*size;
	if (lineh)
		*lineh = fnt->lineh*size;
}

void sth_delete(struct sth_stash* stash)
{
	struct sth_texture* tex = NULL;
	struct sth_texture* curtex = NULL;
	struct sth_font* fnt = NULL;
	struct sth_font* curfnt = NULL;

	if (!stash)
        return;

	tex = stash->tt_textures;
	while(tex != NULL) {
		curtex = tex;
		tex = tex->next;
		if (curtex->id)
			glDeleteTextures(1, &curtex->id);
		free(curtex);
	}

	tex = stash->bm_textures;
	while(tex != NULL) {
		curtex = tex;
		tex = tex->next;
		if (curtex->id)
			glDeleteTextures(1, &curtex->id);
		free(curtex);
	}

	fnt = stash->fonts;
	while(fnt != NULL) {
		curfnt = fnt;
		fnt = fnt->next;
		if (curfnt->glyphs)
			free(curfnt->glyphs);
		if (curfnt->type == TTFONT_FILE && curfnt->data)
			free(curfnt->data);
		free(curfnt);
	}
	free(stash->empty_data);
	free(stash);
}

Added ext/fontstash/fontstash.h.





























































































































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//
// Copyright (c) 2011 Andreas Krinke andreas.krinke@gmx.de
// Copyright (c) 2009 Mikko Mononen memon@inside.org
//
// This software is provided 'as-is', without any express or implied
// warranty.  In no event will the authors be held liable for any damages
// arising from the use of this software.
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would be
//    appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
//    misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
//

#ifndef FONTSTASH_H
#define FONTSTASH_H

#define STH_ESUCCESS 0
// error opening file
#define STH_EFILEIO -1
// error initializing truetype font
#define STH_ETTFINIT -2
// invalid argument
#define STH_EINVAL -3
// not enough memory
#define STH_ENOMEM -4

struct sth_stash* sth_create(int cachew, int cacheh);

int sth_add_font(struct sth_stash* stash, const char* path);
int sth_add_font_from_memory(struct sth_stash* stash, unsigned char* buffer);

int sth_add_bitmap_font(struct sth_stash* stash, int ascent, int descent, int line_gap);
int sth_add_glyph_for_codepoint(struct sth_stash* stash, int idx, GLuint id, unsigned int codepoint,
                                short size, short base, int x, int y, int w, int h,
                                float xoffset, float yoffset, float xadvance);
int sth_add_glyph_for_char(struct sth_stash* stash, int idx, GLuint id, const char* s,
                           short size, short base, int x, int y, int w, int h,
                           float xoffset, float yoffset, float xadvance);

void sth_begin_draw(struct sth_stash* stash);
void sth_end_draw(struct sth_stash* stash);

void sth_draw_text(struct sth_stash* stash,
				   int idx, float size,
				   float x, float y, const char* string, float* dx);

void sth_dim_text(struct sth_stash* stash, int idx, float size, const char* string,
				  float* minx, float* miny, float* maxx, float* maxy);

void sth_vmetrics(struct sth_stash* stash,
				  int idx, float size,
				  float* ascender, float* descender, float * lineh);

void sth_delete(struct sth_stash* stash);

#endif // FONTSTASH_H

Added ext/fontstash/stb_truetype.c.















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#define STB_TRUETYPE_IMPLEMENTATION

#define STBTT_malloc(x,u)    malloc(x)
#define STBTT_free(x,u)      free(x)
#define STBTT_assert(...)    do {} while(0)

#include "stb_truetype.h"

Added ext/fontstash/stb_truetype.h.



































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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// stb_truetype.h - v0.6c - public domain
// authored from 2009-2012 by Sean Barrett / RAD Game Tools
//
//   This library processes TrueType files:
//        parse files
//        extract glyph metrics
//        extract glyph shapes
//        render glyphs to one-channel bitmaps with antialiasing (box filter)
//
//   Todo:
//        non-MS cmaps
//        crashproof on bad data
//        hinting? (no longer patented)
//        cleartype-style AA?
//        optimize: use simple memory allocator for intermediates
//        optimize: build edge-list directly from curves
//        optimize: rasterize directly from curves?
//
// ADDITIONAL CONTRIBUTORS
//
//   Mikko Mononen: compound shape support, more cmap formats
//   Tor Andersson: kerning, subpixel rendering
//
//   Bug/warning reports:
//       "Zer" on mollyrocket (with fix)
//       Cass Everitt
//       stoiko (Haemimont Games)
//       Brian Hook
//       Walter van Niftrik
//
// VERSION HISTORY
//
//   0.6c (2012-07-24) improve documentation
//   0.6b (2012-07-20) fix a few more warnings
//   0.6  (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels,
//                        stbtt_GetFontBoundingBox, stbtt_IsGlyphEmpty
//   0.5  (2011-12-09) bugfixes:
//                        subpixel glyph renderer computed wrong bounding box
//                        first vertex of shape can be off-curve (FreeSans)
//   0.4b (2011-12-03) fixed an error in the font baking example
//   0.4  (2011-12-01) kerning, subpixel rendering (tor)
//                    bugfixes for:
//                        codepoint-to-glyph conversion using table fmt=12
//                        codepoint-to-glyph conversion using table fmt=4
//                        stbtt_GetBakedQuad with non-square texture (Zer)
//                    updated Hello World! sample to use kerning and subpixel
//                    fixed some warnings
//   0.3  (2009-06-24) cmap fmt=12, compound shapes (MM)
//                    userdata, malloc-from-userdata, non-zero fill (STB)
//   0.2  (2009-03-11) Fix unsigned/signed char warnings
//   0.1  (2009-03-09) First public release
//
// LICENSE
//
//   This software is in the public domain. Where that dedication is not
//   recognized, you are granted a perpetual, irrevokable license to copy
//   and modify this file as you see fit.
//
// USAGE
//
//   Include this file in whatever places neeed to refer to it. In ONE C/C++
//   file, write:
//      #define STB_TRUETYPE_IMPLEMENTATION
//   before the #include of this file. This expands out the actual
//   implementation into that C/C++ file.
//
//   Simple 3D API (don't ship this, but it's fine for tools and quick start,
//                  and you can cut and paste from it to move to more advanced)
//           stbtt_BakeFontBitmap()               -- bake a font to a bitmap for use as texture
//           stbtt_GetBakedQuad()                 -- compute quad to draw for a given char
//
//   "Load" a font file from a memory buffer (you have to keep the buffer loaded)
//           stbtt_InitFont()
//           stbtt_GetFontOffsetForIndex()        -- use for TTC font collections
//
//   Render a unicode codepoint to a bitmap
//           stbtt_GetCodepointBitmap()           -- allocates and returns a bitmap
//           stbtt_MakeCodepointBitmap()          -- renders into bitmap you provide
//           stbtt_GetCodepointBitmapBox()        -- how big the bitmap must be
//
//   Character advance/positioning
//           stbtt_GetCodepointHMetrics()
//           stbtt_GetFontVMetrics()
//           stbtt_GetCodepointKernAdvance()
//
// ADDITIONAL DOCUMENTATION
//
//   Immediately after this block comment are a series of sample programs.
//
//   After the sample programs is the "header file" section. This section
//   includes documentation for each API function.
//
//   Some important concepts to understand to use this library:
//
//      Codepoint
//         Characters are defined by unicode codepoints, e.g. 65 is
//         uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is
//         the hiragana for "ma".
//
//      Glyph
//         A visual character shape (every codepoint is rendered as
//         some glyph)
//
//      Glyph index
//         A font-specific integer ID representing a glyph
//
//      Baseline
//         Glyph shapes are defined relative to a baseline, which is the
//         bottom of uppercase characters. Characters extend both above
//         and below the baseline.
//
//      Current Point
//         As you draw text to the screen, you keep track of a "current point"
//         which is the origin of each character. The current point's vertical
//         position is the baseline. Even "baked fonts" use this model.
//
//      Vertical Font Metrics
//         The vertical qualities of the font, used to vertically position
//         and space the characters. See docs for stbtt_GetFontVMetrics.
//
//      Font Size in Pixels or Points
//         The preferred interface for specifying font sizes in stb_truetype
//         is to specify how tall the font's vertical extent should be in pixels.
//         If that sounds good enough, skip the next paragraph.
//
//         Most font APIs instead use "points", which are a common typographic
//         measurement for describing font size, defined as 72 points per inch.
//         stb_truetype provides a point API for compatibility. However, true
//         "per inch" conventions don't make much sense on computer displays
//         since they different monitors have different number of pixels per
//         inch. For example, Windows traditionally uses a convention that
//         there are 96 pixels per inch, thus making 'inch' measurements have
//         nothing to do with inches, and thus effectively defining a point to
//         be 1.333 pixels. Additionally, the TrueType font data provides
//         an explicit scale factor to scale a given font's glyphs to points,
//         but the author has observed that this scale factor is often wrong
//         for non-commercial fonts, thus making fonts scaled in points
//         according to the TrueType spec incoherently sized in practice.
//
// ADVANCED USAGE
//
//   Quality:
//
//    - Use the functions with Subpixel at the end to allow your characters
//      to have subpixel positioning. Since the font is anti-aliased, not
//      hinted, this is very import for quality. (This is not possible with
//      baked fonts.)
//
//    - Kerning is now supported, and if you're supporting subpixel rendering
//      then kerning is worth using to give your text a polished look.
//
//   Performance:
//
//    - Convert Unicode codepoints to glyph indexes and operate on the glyphs;
//      if you don't do this, stb_truetype is forced to do the conversion on
//      every call.
//
//    - There are a lot of memory allocations. We should modify it to take
//      a temp buffer and allocate from the temp buffer (without freeing),
//      should help performance a lot.
//
// NOTES
//
//   The system uses the raw data found in the .ttf file without changing it
//   and without building auxiliary data structures. This is a bit inefficient
//   on little-endian systems (the data is big-endian), but assuming you're
//   caching the bitmaps or glyph shapes this shouldn't be a big deal.
//
//   It appears to be very hard to programmatically determine what font a
//   given file is in a general way. I provide an API for this, but I don't
//   recommend it.
//
//
// SOURCE STATISTICS (based on v0.6c, 2050 LOC)
//
//   Documentation & header file        520 LOC  \___ 660 LOC documentation
//   Sample code                        140 LOC  /
//   Truetype parsing                   620 LOC  ---- 620 LOC TrueType
//   Software rasterization             240 LOC  \                           .
//   Curve tesselation                  120 LOC   \__ 550 LOC Bitmap creation
//   Bitmap management                  100 LOC   /
//   Baked bitmap interface              70 LOC  /
//   Font name matching & access        150 LOC  ---- 150
//   C runtime library abstraction       60 LOC  ----  60


//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
////
////  SAMPLE PROGRAMS
////
//
//  Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless
//
#if 0
#define STB_TRUETYPE_IMPLEMENTATION  // force following include to generate implementation
#include "stb_truetype.h"

char ttf_buffer[1<<20];
unsigned char temp_bitmap[512*512];

stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
GLstbtt_uint ftex;

void my_stbtt_initfont(void)
{
   fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
   stbtt_BakeFontBitmap(data,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits!
   // can free ttf_buffer at this point
   glGenTextures(1, &ftex);
   glBindTexture(GL_TEXTURE_2D, ftex);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
   // can free temp_bitmap at this point
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
}

void my_stbtt_print(float x, float y, char *text)
{
   // assume orthographic projection with units = screen pixels, origin at top left
   glBindTexture(GL_TEXTURE_2D, ftex);
   glBegin(GL_QUADS);
   while (*text) {
      if (*text >= 32 && *text < 128) {
         stbtt_aligned_quad q;
         stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl,0=old d3d
         glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y0);
         glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y0);
         glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y1);
         glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y1);
      }
      ++text;
   }
   glEnd();
}
#endif
//
//
//////////////////////////////////////////////////////////////////////////////
//
// Complete program (this compiles): get a single bitmap, print as ASCII art
//
#if 0
#include <stdio.h>
#define STB_TRUETYPE_IMPLEMENTATION  // force following include to generate implementation
#include "stb_truetype.h"

char ttf_buffer[1<<25];

int main(int argc, char **argv)
{
   stbtt_fontinfo font;
   unsigned char *bitmap;
   int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20);

   fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb"));

   stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
   bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0);

   for (j=0; j < h; ++j) {
      for (i=0; i < w; ++i)
         putchar(" .:ioVM@"[bitmap[j*w+i]>>5]);
      putchar('\n');
   }
   return 0;
}
#endif
//
// Output:
//
//     .ii.
//    @@@@@@.
//   V@Mio@@o
//   :i.  V@V
//     :oM@@M
//   :@@@MM@M
//   @@o  o@M
//  :@@.  M@M
//   @@@o@@@@
//   :M@@V:@@.
//
//////////////////////////////////////////////////////////////////////////////
//
// Complete program: print "Hello World!" banner, with bugs
//
#if 0
char buffer[24<<20];
unsigned char screen[20][79];

int main(int arg, char **argv)
{
   stbtt_fontinfo font;
   int i,j,ascent,baseline,ch=0;
   float scale, xpos=0;
   char *text = "Heljo World!";

   fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
   stbtt_InitFont(&font, buffer, 0);

   scale = stbtt_ScaleForPixelHeight(&font, 15);
   stbtt_GetFontVMetrics(&font, &ascent,0,0);
   baseline = (int) (ascent*scale);

   while (text[ch]) {
      int advance,lsb,x0,y0,x1,y1;
      float x_shift = xpos - (float) floor(xpos);
      stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb);
      stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1);
      stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]);
      // note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong
      // because this API is really for baking character bitmaps into textures. if you want to render
      // a sequence of characters, you really need to render each bitmap to a temp buffer, then
      // "alpha blend" that into the working buffer
      xpos += (advance * scale);
      if (text[ch+1])
         xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]);
      ++ch;
   }

   for (j=0; j < 20; ++j) {
      for (i=0; i < 78; ++i)
         putchar(" .:ioVM@"[screen[j][i]>>5]);
      putchar('\n');
   }

   return 0;
}
#endif


//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
////
////   INTEGRATION WITH YOUR CODEBASE
////
////   The following sections allow you to supply alternate definitions
////   of C library functions used by stb_truetype.

#ifdef STB_TRUETYPE_IMPLEMENTATION
   // #define your own (u)stbtt_int8/16/32 before including to override this
   #ifndef stbtt_uint8
   typedef unsigned char   stbtt_uint8;
   typedef signed   char   stbtt_int8;
   typedef unsigned short  stbtt_uint16;
   typedef signed   short  stbtt_int16;
   typedef unsigned int    stbtt_uint32;
   typedef signed   int    stbtt_int32;
   #endif

   typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
   typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];

   // #define your own STBTT_sort() to override this to avoid qsort
   #ifndef STBTT_sort
   #include <stdlib.h>
   #define STBTT_sort(data,num_items,item_size,compare_func)   qsort(data,num_items,item_size,compare_func)
   #endif

   // #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
   #ifndef STBTT_ifloor
   #include <math.h>
   #define STBTT_ifloor(x)   ((int) floor(x))
   #define STBTT_iceil(x)    ((int) ceil(x))
   #endif

   // #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h
   #ifndef STBTT_malloc
   #include <malloc.h>
   #define STBTT_malloc(x,u)  malloc(x)
   #define STBTT_free(x,u)    free(x)
   #endif

   #ifndef STBTT_assert
   #include <assert.h>
   #define STBTT_assert(x)    assert(x)
   #endif

   #ifndef STBTT_strlen
   #include <string.h>
   #define STBTT_strlen(x)    strlen(x)
   #endif

   #ifndef STBTT_memcpy
   #include <memory.h>
   #define STBTT_memcpy       memcpy
   #define STBTT_memset       memset
   #endif
#endif

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
////
////   INTERFACE
////
////

#ifndef __STB_INCLUDE_STB_TRUETYPE_H__
#define __STB_INCLUDE_STB_TRUETYPE_H__

#ifdef __cplusplus
extern "C" {
#endif

//////////////////////////////////////////////////////////////////////////////
//
// TEXTURE BAKING API
//
// If you use this API, you only have to call two functions ever.
//

typedef struct
{
   unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
   float xoff,yoff,xadvance;
} stbtt_bakedchar;

extern int stbtt_BakeFontBitmap(const unsigned char *data, int offset,  // font location (use offset=0 for plain .ttf)
                                float pixel_height,                     // height of font in pixels
                                unsigned char *pixels, int pw, int ph,  // bitmap to be filled in
                                int first_char, int num_chars,          // characters to bake
                                stbtt_bakedchar *chardata);             // you allocate this, it's num_chars long
// if return is positive, the first unused row of the bitmap
// if return is negative, returns the negative of the number of characters that fit
// if return is 0, no characters fit and no rows were used
// This uses a very crappy packing.

typedef struct
{
   float x0,y0,s0,t0; // top-left
   float x1,y1,s1,t1; // bottom-right
} stbtt_aligned_quad;

extern void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph,  // same data as above
                               int char_index,             // character to display
                               float *xpos, float *ypos,   // pointers to current position in screen pixel space
                               stbtt_aligned_quad *q,      // output: quad to draw
                               int opengl_fillrule);       // true if opengl fill rule; false if DX9 or earlier
// Call GetBakedQuad with char_index = 'character - first_char', and it
// creates the quad you need to draw and advances the current position.
//
// The coordinate system used assumes y increases downwards.
//
// Characters will extend both above and below the current position;
// see discussion of "BASELINE" above.
//
// It's inefficient; you might want to c&p it and optimize it.


//////////////////////////////////////////////////////////////////////////////
//
// FONT LOADING
//
//

extern int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
// Each .ttf/.ttc file may have more than one font. Each font has a sequential
// index number starting from 0. Call this function to get the font offset for
// a given index; it returns -1 if the index is out of range. A regular .ttf
// file will only define one font and it always be at offset 0, so it will
// return '0' for index 0, and -1 for all other indices. You can just skip
// this step if you know it's that kind of font.


// The following structure is defined publically so you can declare one on
// the stack or as a global or etc, but you should treat it as opaque.
typedef struct stbtt_fontinfo
{
   void           * userdata;
   unsigned char  * data;              // pointer to .ttf file
   int              fontstart;         // offset of start of font

   int numGlyphs;                     // number of glyphs, needed for range checking

   int loca,head,glyf,hhea,hmtx,kern; // table locations as offset from start of .ttf
   int index_map;                     // a cmap mapping for our chosen character encoding
   int indexToLocFormat;              // format needed to map from glyph index to glyph
} stbtt_fontinfo;

extern int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset);
// Given an offset into the file that defines a font, this function builds
// the necessary cached info for the rest of the system. You must allocate
// the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't
// need to do anything special to free it, because the contents are pure
// value data with no additional data structures. Returns 0 on failure.


//////////////////////////////////////////////////////////////////////////////
//
// CHARACTER TO GLYPH-INDEX CONVERSIOn

int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint);
// If you're going to perform multiple operations on the same character
// and you want a speed-up, call this function with the character you're
// going to process, then use glyph-based functions instead of the
// codepoint-based functions.


//////////////////////////////////////////////////////////////////////////////
//
// CHARACTER PROPERTIES
//

extern float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels);
// computes a scale factor to produce a font whose "height" is 'pixels' tall.
// Height is measured as the distance from the highest ascender to the lowest
// descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics
// and computing:
//       scale = pixels / (ascent - descent)
// so if you prefer to measure height by the ascent only, use a similar calculation.

extern float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels);
// computes a scale factor to produce a font whose EM size is mapped to
// 'pixels' tall. This is probably what traditional APIs compute, but
// I'm not positive.

extern void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap);
// ascent is the coordinate above the baseline the font extends; descent
// is the coordinate below the baseline the font extends (i.e. it is typically negative)
// lineGap is the spacing between one row's descent and the next row's ascent...
// so you should advance the vertical position by "*ascent - *descent + *lineGap"
//   these are expressed in unscaled coordinates, so you must multiply by
//   the scale factor for a given size

extern void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1);
// the bounding box around all possible characters

extern void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing);
// leftSideBearing is the offset from the current horizontal position to the left edge of the character
// advanceWidth is the offset from the current horizontal position to the next horizontal position
//   these are expressed in unscaled coordinates

extern int  stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2);
// an additional amount to add to the 'advance' value between ch1 and ch2
// @TODO; for now always returns 0!

extern int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1);
// Gets the bounding box of the visible part of the glyph, in unscaled coordinates

extern void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing);
extern int  stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2);
extern int  stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
// as above, but takes one or more glyph indices for greater efficiency


//////////////////////////////////////////////////////////////////////////////
//
// GLYPH SHAPES (you probably don't need these, but they have to go before
// the bitmaps for C declaration-order reasons)
//

#ifndef STBTT_vmove // you can predefine these to use different values (but why?)
   enum {
      STBTT_vmove=1,
      STBTT_vline,
      STBTT_vcurve
   };
#endif

#ifndef stbtt_vertex // you can predefine this to use different values
                   // (we share this with other code at RAD)
   #define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file
   typedef struct
   {
      stbtt_vertex_type x,y,cx,cy;
      unsigned char type,padding;
   } stbtt_vertex;
#endif

extern int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
// returns non-zero if nothing is drawn for this glyph

extern int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices);
extern int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices);
// returns # of vertices and fills *vertices with the pointer to them
//   these are expressed in "unscaled" coordinates

extern void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
// frees the data allocated above

//////////////////////////////////////////////////////////////////////////////
//
// BITMAP RENDERING
//

extern void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
// frees the bitmap allocated below

extern unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
// allocates a large-enough single-channel 8bpp bitmap and renders the
// specified character/glyph at the specified scale into it, with
// antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque).
// *width & *height are filled out with the width & height of the bitmap,
// which is stored left-to-right, top-to-bottom.
//
// xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap

extern unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
// the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel
// shift for the character

extern void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint);
// the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap
// in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap
// is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the
// width and height and positioning info for it first.

extern void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint);
// same as stbtt_MakeCodepointBitmap, but you can specify a subpixel
// shift for the character

extern void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
// get the bbox of the bitmap centered around the glyph origin; so the
// bitmap width is ix1-ix0, height is iy1-iy0, and location to place
// the bitmap top left is (leftSideBearing*scale,iy0).
// (Note that the bitmap uses y-increases-down, but the shape uses
// y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.)

extern void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
// same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel
// shift for the character

// the following functions are equivalent to the above functions, but operate
// on glyph indices instead of Unicode codepoints (for efficiency)
extern unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff);
extern unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff);
extern void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph);
extern void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph);
extern void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
extern void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);


// @TODO: don't expose this structure
typedef struct
{
   int w,h,stride;
   unsigned char *pixels;
} stbtt__bitmap;

extern void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata);

//////////////////////////////////////////////////////////////////////////////
//
// Finding the right font...
//
// You should really just solve this offline, keep your own tables
// of what font is what, and don't try to get it out of the .ttf file.
// That's because getting it out of the .ttf file is really hard, because
// the names in the file can appear in many possible encodings, in many
// possible languages, and e.g. if you need a case-insensitive comparison,
// the details of that depend on the encoding & language in a complex way
// (actually underspecified in truetype, but also gigantic).
//
// But you can use the provided functions in two possible ways:
//     stbtt_FindMatchingFont() will use *case-sensitive* comparisons on
//             unicode-encoded names to try to find the font you want;
//             you can run this before calling stbtt_InitFont()
//
//     stbtt_GetFontNameString() lets you get any of the various strings
//             from the file yourself and do your own comparisons on them.
//             You have to have called stbtt_InitFont() first.


extern int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags);
// returns the offset (not index) of the font that matches, or -1 if none
//   if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold".
//   if you use any other flag, use a font name like "Arial"; this checks
//     the 'macStyle' header field; i don't know if fonts set this consistently
#define STBTT_MACSTYLE_DONTCARE     0
#define STBTT_MACSTYLE_BOLD         1
#define STBTT_MACSTYLE_ITALIC       2
#define STBTT_MACSTYLE_UNDERSCORE   4
#define STBTT_MACSTYLE_NONE         8   // <= not same as 0, this makes us check the bitfield is 0

extern int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2);
// returns 1/0 whether the first string interpreted as utf8 is identical to
// the second string interpreted as big-endian utf16... useful for strings from next func

extern const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID);
// returns the string (which may be big-endian double byte, e.g. for unicode)
// and puts the length in bytes in *length.
//
// some of the values for the IDs are below; for more see the truetype spec:
//     http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html
//     http://www.microsoft.com/typography/otspec/name.htm

enum { // platformID
   STBTT_PLATFORM_ID_UNICODE   =0,
   STBTT_PLATFORM_ID_MAC       =1,
   STBTT_PLATFORM_ID_ISO       =2,
   STBTT_PLATFORM_ID_MICROSOFT =3
};

enum { // encodingID for STBTT_PLATFORM_ID_UNICODE
   STBTT_UNICODE_EID_UNICODE_1_0    =0,
   STBTT_UNICODE_EID_UNICODE_1_1    =1,
   STBTT_UNICODE_EID_ISO_10646      =2,
   STBTT_UNICODE_EID_UNICODE_2_0_BMP=3,
   STBTT_UNICODE_EID_UNICODE_2_0_FULL=4
};

enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT
   STBTT_MS_EID_SYMBOL        =0,
   STBTT_MS_EID_UNICODE_BMP   =1,
   STBTT_MS_EID_SHIFTJIS      =2,
   STBTT_MS_EID_UNICODE_FULL  =10
};

enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes
   STBTT_MAC_EID_ROMAN        =0,   STBTT_MAC_EID_ARABIC       =4,
   STBTT_MAC_EID_JAPANESE     =1,   STBTT_MAC_EID_HEBREW       =5,
   STBTT_MAC_EID_CHINESE_TRAD =2,   STBTT_MAC_EID_GREEK        =6,
   STBTT_MAC_EID_KOREAN       =3,   STBTT_MAC_EID_RUSSIAN      =7
};

enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID...
       // problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs
   STBTT_MS_LANG_ENGLISH     =0x0409,   STBTT_MS_LANG_ITALIAN     =0x0410,
   STBTT_MS_LANG_CHINESE     =0x0804,   STBTT_MS_LANG_JAPANESE    =0x0411,
   STBTT_MS_LANG_DUTCH       =0x0413,   STBTT_MS_LANG_KOREAN      =0x0412,
   STBTT_MS_LANG_FRENCH      =0x040c,   STBTT_MS_LANG_RUSSIAN     =0x0419,
   STBTT_MS_LANG_GERMAN      =0x0407,   STBTT_MS_LANG_SPANISH     =0x0409,
   STBTT_MS_LANG_HEBREW      =0x040d,   STBTT_MS_LANG_SWEDISH     =0x041D
};

enum { // languageID for STBTT_PLATFORM_ID_MAC
   STBTT_MAC_LANG_ENGLISH      =0 ,   STBTT_MAC_LANG_JAPANESE     =11,
   STBTT_MAC_LANG_ARABIC       =12,   STBTT_MAC_LANG_KOREAN       =23,
   STBTT_MAC_LANG_DUTCH        =4 ,   STBTT_MAC_LANG_RUSSIAN      =32,
   STBTT_MAC_LANG_FRENCH       =1 ,   STBTT_MAC_LANG_SPANISH      =6 ,
   STBTT_MAC_LANG_GERMAN       =2 ,   STBTT_MAC_LANG_SWEDISH      =5 ,
   STBTT_MAC_LANG_HEBREW       =10,   STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33,
   STBTT_MAC_LANG_ITALIAN      =3 ,   STBTT_MAC_LANG_CHINESE_TRAD =19
};

#ifdef __cplusplus
}
#endif

#endif // __STB_INCLUDE_STB_TRUETYPE_H__

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
////
////   IMPLEMENTATION
////
////

#ifdef STB_TRUETYPE_IMPLEMENTATION

//////////////////////////////////////////////////////////////////////////
//
// accessors to parse data from file
//

// on platforms that don't allow misaligned reads, if we want to allow
// truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE

#define ttBYTE(p)     (* (stbtt_uint8 *) (p))
#define ttCHAR(p)     (* (stbtt_int8 *) (p))
#define ttFixed(p)    ttLONG(p)

#if defined(STB_TRUETYPE_BIGENDIAN) && !defined(ALLOW_UNALIGNED_TRUETYPE)

   #define ttUSHORT(p)   (* (stbtt_uint16 *) (p))
   #define ttSHORT(p)    (* (stbtt_int16 *) (p))
   #define ttULONG(p)    (* (stbtt_uint32 *) (p))
   #define ttLONG(p)     (* (stbtt_int32 *) (p))

#else

   stbtt_uint16 ttUSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
   stbtt_int16 ttSHORT(const stbtt_uint8 *p)   { return p[0]*256 + p[1]; }
   stbtt_uint32 ttULONG(const stbtt_uint8 *p)  { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
   stbtt_int32 ttLONG(const stbtt_uint8 *p)    { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }

#endif

#define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3))
#define stbtt_tag(p,str)           stbtt_tag4(p,str[0],str[1],str[2],str[3])

static int stbtt__isfont(const stbtt_uint8 *font)
{
   // check the version number
   if (stbtt_tag4(font, '1',0,0,0))  return 1; // TrueType 1
   if (stbtt_tag(font, "typ1"))   return 1; // TrueType with type 1 font -- we don't support this!
   if (stbtt_tag(font, "OTTO"))   return 1; // OpenType with CFF
   if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0
   return 0;
}

// @OPTIMIZE: binary search
static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag)
{
   stbtt_int32 num_tables = ttUSHORT(data+fontstart+4);
   stbtt_uint32 tabledir = fontstart + 12;
   stbtt_int32 i;
   for (i=0; i < num_tables; ++i) {
      stbtt_uint32 loc = tabledir + 16*i;
      if (stbtt_tag(data+loc+0, tag))
         return ttULONG(data+loc+8);
   }
   return 0;
}

int stbtt_GetFontOffsetForIndex(const unsigned char *font_collection, int index)
{
   // if it's just a font, there's only one valid index
   if (stbtt__isfont(font_collection))
      return index == 0 ? 0 : -1;

   // check if it's a TTC
   if (stbtt_tag(font_collection, "ttcf")) {
      // version 1?
      if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
         stbtt_int32 n = ttLONG(font_collection+8);
         if (index >= n)
            return -1;
         return ttULONG(font_collection+12+index*14);
      }
   }
   return -1;
}

int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data2, int fontstart)
{
   stbtt_uint8 *data = (stbtt_uint8 *) data2;
   stbtt_uint32 cmap, t;
   stbtt_int32 i,numTables;

   info->data = data;
   info->fontstart = fontstart;

   cmap = stbtt__find_table(data, fontstart, "cmap");       // required
   info->loca = stbtt__find_table(data, fontstart, "loca"); // required
   info->head = stbtt__find_table(data, fontstart, "head"); // required
   info->glyf = stbtt__find_table(data, fontstart, "glyf"); // required
   info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required
   info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required
   info->kern = stbtt__find_table(data, fontstart, "kern"); // not required
   if (!cmap || !info->loca || !info->head || !info->glyf || !info->hhea || !info->hmtx)
      return 0;

   t = stbtt__find_table(data, fontstart, "maxp");
   if (t)
      info->numGlyphs = ttUSHORT(data+t+4);
   else
      info->numGlyphs = 0xffff;

   // find a cmap encoding table we understand *now* to avoid searching
   // later. (todo: could make this installable)
   // the same regardless of glyph.
   numTables = ttUSHORT(data + cmap + 2);
   info->index_map = 0;
   for (i=0; i < numTables; ++i) {
      stbtt_uint32 encoding_record = cmap + 4 + 8 * i;
      // find an encoding we understand:
      switch(ttUSHORT(data+encoding_record)) {
         case STBTT_PLATFORM_ID_MICROSOFT:
            switch (ttUSHORT(data+encoding_record+2)) {
               case STBTT_MS_EID_UNICODE_BMP:
               case STBTT_MS_EID_UNICODE_FULL:
                  // MS/Unicode
                  info->index_map = cmap + ttULONG(data+encoding_record+4);
                  break;
            }
            break;
      }
   }
   if (info->index_map == 0)
      return 0;

   info->indexToLocFormat = ttUSHORT(data+info->head + 50);
   return 1;
}

int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint)
{
   stbtt_uint8 *data = info->data;
   stbtt_uint32 index_map = info->index_map;

   stbtt_uint16 format = ttUSHORT(data + index_map + 0);
   if (format == 0) { // apple byte encoding
      stbtt_int32 bytes = ttUSHORT(data + index_map + 2);
      if (unicode_codepoint < bytes-6)
         return ttBYTE(data + index_map + 6 + unicode_codepoint);
      return 0;
   } else if (format == 6) {
      stbtt_uint32 first = ttUSHORT(data + index_map + 6);
      stbtt_uint32 count = ttUSHORT(data + index_map + 8);
      if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count)
         return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2);
      return 0;
   } else if (format == 2) {
      STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean
      return 0;
   } else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges
      stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1;
      stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1;
      stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10);
      stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1;
      stbtt_uint16 item, offset, start, end;

      // do a binary search of the segments
      stbtt_uint32 endCount = index_map + 14;
      stbtt_uint32 search = endCount;

      if (unicode_codepoint > 0xffff)
         return 0;

      // they lie from endCount .. endCount + segCount
      // but searchRange is the nearest power of two, so...
      if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2))
         search += rangeShift*2;

      // now decrement to bias correctly to find smallest
      search -= 2;
      while (entrySelector) {
         stbtt_uint16 start, end;
         searchRange >>= 1;
         start = ttUSHORT(data + search + 2 + segcount*2 + 2);
         end = ttUSHORT(data + search + 2);
         start = ttUSHORT(data + search + searchRange*2 + segcount*2 + 2);
         end = ttUSHORT(data + search + searchRange*2);
         if (unicode_codepoint > end)
            search += searchRange*2;
         --entrySelector;
      }
      search += 2;

      item = (stbtt_uint16) ((search - endCount) >> 1);

      STBTT_assert(unicode_codepoint <= ttUSHORT(data + endCount + 2*item));
      start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
      end = ttUSHORT(data + index_map + 14 + 2 + 2*item);
      if (unicode_codepoint < start)
         return 0;

      offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item);
      if (offset == 0)
         return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item));

      return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item);
   } else if (format == 12 || format == 13) {
      stbtt_uint32 ngroups = ttULONG(data+index_map+12);
      stbtt_int32 low,high;
      low = 0; high = (stbtt_int32)ngroups;
      // Binary search the right group.
      while (low < high) {
         stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high
         stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12);
         stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4);
         if ((stbtt_uint32) unicode_codepoint < start_char)
            high = mid;
         else if ((stbtt_uint32) unicode_codepoint > end_char)
            low = mid+1;
         else {
            stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8);
            if (format == 12)
               return start_glyph + unicode_codepoint-start_char;
            else // format == 13
               return start_glyph;
         }
      }
      return 0; // not found
   }
   // @TODO
   STBTT_assert(0);
   return 0;
}

int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices)
{
   return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices);
}

static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy)
{
   v->type = type;
   v->x = (stbtt_int16) x;
   v->y = (stbtt_int16) y;
   v->cx = (stbtt_int16) cx;
   v->cy = (stbtt_int16) cy;
}

static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index)
{
   int g1,g2;

   if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range
   if (info->indexToLocFormat >= 2)    return -1; // unknown index->glyph map format

   if (info->indexToLocFormat == 0) {
      g1 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2) * 2;
      g2 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2;
   } else {
      g1 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4);
      g2 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4 + 4);
   }

   return g1==g2 ? -1 : g1; // if length is 0, return -1
}

int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
{
   int g = stbtt__GetGlyfOffset(info, glyph_index);
   if (g < 0) return 0;

   if (x0) *x0 = ttSHORT(info->data + g + 2);
   if (y0) *y0 = ttSHORT(info->data + g + 4);
   if (x1) *x1 = ttSHORT(info->data + g + 6);
   if (y1) *y1 = ttSHORT(info->data + g + 8);
   return 1;
}

int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1)
{
   return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1);
}

int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index)
{
   stbtt_int16 numberOfContours;
   int g = stbtt__GetGlyfOffset(info, glyph_index);
   if (g < 0) return 1;
   numberOfContours = ttSHORT(info->data + g);
   return numberOfContours == 0;
}

static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off,
    stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy)
{
   if (start_off) {
      if (was_off)
         stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy);
      stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, sx,sy,scx,scy);
   } else {
      if (was_off)
         stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve,sx,sy,cx,cy);
      else
         stbtt_setvertex(&vertices[num_vertices++], STBTT_vline,sx,sy,0,0);
   }
   return num_vertices;
}

int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
{
   stbtt_int16 numberOfContours;
   stbtt_uint8 *endPtsOfContours;
   stbtt_uint8 *data = info->data;
   stbtt_vertex *vertices=0;
   int num_vertices=0;
   int g = stbtt__GetGlyfOffset(info, glyph_index);

   *pvertices = NULL;

   if (g < 0) return 0;

   numberOfContours = ttSHORT(data + g);

   if (numberOfContours > 0) {
      stbtt_uint8 flags=0,flagcount;
      stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0;
      stbtt_int32 x,y,cx,cy,sx,sy, scx,scy;
      stbtt_uint8 *points;
      endPtsOfContours = (data + g + 10);
      ins = ttUSHORT(data + g + 10 + numberOfContours * 2);
      points = data + g + 10 + numberOfContours * 2 + 2 + ins;

      n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2);

      m = n + 2*numberOfContours;  // a loose bound on how many vertices we might need
      vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata);
      if (vertices == 0)
         return 0;

      next_move = 0;
      flagcount=0;

      // in first pass, we load uninterpreted data into the allocated array
      // above, shifted to the end of the array so we won't overwrite it when
      // we create our final data starting from the front

      off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated

      // first load flags

      for (i=0; i < n; ++i) {
         if (flagcount == 0) {
            flags = *points++;
            if (flags & 8)
               flagcount = *points++;
         } else
            --flagcount;
         vertices[off+i].type = flags;
      }

      // now load x coordinates
      x=0;
      for (i=0; i < n; ++i) {
         flags = vertices[off+i].type;
         if (flags & 2) {
            stbtt_int16 dx = *points++;
            x += (flags & 16) ? dx : -dx; // ???
         } else {
            if (!(flags & 16)) {
               x = x + (stbtt_int16) (points[0]*256 + points[1]);
               points += 2;
            }
         }
         vertices[off+i].x = (stbtt_int16) x;
      }

      // now load y coordinates
      y=0;
      for (i=0; i < n; ++i) {
         flags = vertices[off+i].type;
         if (flags & 4) {
            stbtt_int16 dy = *points++;
            y += (flags & 32) ? dy : -dy; // ???
         } else {
            if (!(flags & 32)) {
               y = y + (stbtt_int16) (points[0]*256 + points[1]);
               points += 2;
            }
         }
         vertices[off+i].y = (stbtt_int16) y;
      }

      // now convert them to our format
      num_vertices=0;
      sx = sy = cx = cy = scx = scy = 0;
      for (i=0; i < n; ++i) {
         flags = vertices[off+i].type;
         x     = (stbtt_int16) vertices[off+i].x;
         y     = (stbtt_int16) vertices[off+i].y;

         if (next_move == i) {
            if (i != 0)
               num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);

            // now start the new one
            start_off = !(flags & 1);
            if (start_off) {
               // if we start off with an off-curve point, then when we need to find a point on the curve
               // where we can start, and we need to save some state for when we wraparound.
               scx = x;
               scy = y;
               if (!(vertices[off+i+1].type & 1)) {
                  // next point is also a curve point, so interpolate an on-point curve
                  sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1;
                  sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1;
               } else {
                  // otherwise just use the next point as our start point
                  sx = (stbtt_int32) vertices[off+i+1].x;
                  sy = (stbtt_int32) vertices[off+i+1].y;
                  ++i; // we're using point i+1 as the starting point, so skip it
               }
            } else {
               sx = x;
               sy = y;
            }
            stbtt_setvertex(&vertices[num_vertices++], STBTT_vmove,sx,sy,0,0);
            was_off = 0;
            next_move = 1 + ttUSHORT(endPtsOfContours+j*2);
            ++j;
         } else {
            if (!(flags & 1)) { // if it's a curve
               if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint
                  stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy);
               cx = x;
               cy = y;
               was_off = 1;
            } else {
               if (was_off)
                  stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, x,y, cx, cy);
               else
                  stbtt_setvertex(&vertices[num_vertices++], STBTT_vline, x,y,0,0);
               was_off = 0;
            }
         }
      }
      num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
   } else if (numberOfContours == -1) {
      // Compound shapes.
      int more = 1;
      stbtt_uint8 *comp = data + g + 10;
      num_vertices = 0;
      vertices = 0;
      while (more) {
         stbtt_uint16 flags, gidx;
         int comp_num_verts = 0, i;
         stbtt_vertex *comp_verts = 0, *tmp = 0;
         float mtx[6] = {1,0,0,1,0,0}, m, n;

         flags = ttSHORT(comp); comp+=2;
         gidx = ttSHORT(comp); comp+=2;

         if (flags & 2) { // XY values
            if (flags & 1) { // shorts
               mtx[4] = ttSHORT(comp); comp+=2;
               mtx[5] = ttSHORT(comp); comp+=2;
            } else {
               mtx[4] = ttCHAR(comp); comp+=1;
               mtx[5] = ttCHAR(comp); comp+=1;
            }
         }
         else {
            // @TODO handle matching point
            STBTT_assert(0);
         }
         if (flags & (1<<3)) { // WE_HAVE_A_SCALE
            mtx[0] = mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
            mtx[1] = mtx[2] = 0;
         } else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE
            mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
            mtx[1] = mtx[2] = 0;
            mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
         } else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO
            mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
            mtx[1] = ttSHORT(comp)/16384.0f; comp+=2;
            mtx[2] = ttSHORT(comp)/16384.0f; comp+=2;
            mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
         }

         // Find transformation scales.
         m = (float) sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
         n = (float) sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]);

         // Get indexed glyph.
         comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts);
         if (comp_num_verts > 0) {
            // Transform vertices.
            for (i = 0; i < comp_num_verts; ++i) {
               stbtt_vertex* v = &comp_verts[i];
               stbtt_vertex_type x,y;
               x=v->x; y=v->y;
               v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
               v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
               x=v->cx; y=v->cy;
               v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
               v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
            }
            // Append vertices.
            tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata);
            if (!tmp) {
               if (vertices) STBTT_free(vertices, info->userdata);
               if (comp_verts) STBTT_free(comp_verts, info->userdata);
               return 0;
            }
            if (num_vertices > 0) memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
            memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
            if (vertices) STBTT_free(vertices, info->userdata);
            vertices = tmp;
            STBTT_free(comp_verts, info->userdata);
            num_vertices += comp_num_verts;
         }
         // More components ?
         more = flags & (1<<5);
      }
   } else if (numberOfContours < 0) {
      // @TODO other compound variations?
      STBTT_assert(0);
   } else {
      // numberOfCounters == 0, do nothing
   }

   *pvertices = vertices;
   return num_vertices;
}

void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing)
{
   stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34);
   if (glyph_index < numOfLongHorMetrics) {
      if (advanceWidth)     *advanceWidth    = ttSHORT(info->data + info->hmtx + 4*glyph_index);
      if (leftSideBearing)  *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2);
   } else {
      if (advanceWidth)     *advanceWidth    = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1));
      if (leftSideBearing)  *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics));
   }
}

int  stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
{
   stbtt_uint8 *data = info->data + info->kern;
   stbtt_uint32 needle, straw;
   int l, r, m;

   // we only look at the first table. it must be 'horizontal' and format 0.
   if (!info->kern)
      return 0;
   if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
      return 0;
   if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
      return 0;

   l = 0;
   r = ttUSHORT(data+10) - 1;
   needle = glyph1 << 16 | glyph2;
   while (l <= r) {
      m = (l + r) >> 1;
      straw = ttULONG(data+18+(m*6)); // note: unaligned read
      if (needle < straw)
         r = m - 1;
      else if (needle > straw)
         l = m + 1;
      else
         return ttSHORT(data+22+(m*6));
   }
   return 0;
}

int  stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2)
{
   if (!info->kern) // if no kerning table, don't waste time looking up both codepoint->glyphs
      return 0;
   return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2));
}

void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing)
{
   stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing);
}

void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap)
{
   if (ascent ) *ascent  = ttSHORT(info->data+info->hhea + 4);
   if (descent) *descent = ttSHORT(info->data+info->hhea + 6);
   if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8);
}

void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1)
{
   *x0 = ttSHORT(info->data + info->head + 36);
   *y0 = ttSHORT(info->data + info->head + 38);
   *x1 = ttSHORT(info->data + info->head + 40);
   *y1 = ttSHORT(info->data + info->head + 42);
}

float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height)
{
   int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data + info->hhea + 6);
   return (float) height / fheight;
}

float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels)
{
   int unitsPerEm = ttUSHORT(info->data + info->head + 18);
   return pixels / unitsPerEm;
}

void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
{
   STBTT_free(v, info->userdata);
}

//////////////////////////////////////////////////////////////////////////////
//
// antialiasing software rasterizer
//

void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
   int x0,y0,x1,y1;
   if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1))
      x0=y0=x1=y1=0; // e.g. space character
   // now move to integral bboxes (treating pixels as little squares, what pixels get touched)?
   if (ix0) *ix0 =  STBTT_ifloor(x0 * scale_x + shift_x);
   if (iy0) *iy0 = -STBTT_iceil (y1 * scale_y + shift_y);
   if (ix1) *ix1 =  STBTT_iceil (x1 * scale_x + shift_x);
   if (iy1) *iy1 = -STBTT_ifloor(y0 * scale_y + shift_y);
}
void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
   stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1);
}

void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
   stbtt_GetGlyphBitmapBoxSubpixel(font, stbtt_FindGlyphIndex(font,codepoint), scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1);
}

void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
   stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x, scale_y,0.0f,0.0f, ix0,iy0,ix1,iy1);
}

typedef struct stbtt__edge {
   float x0,y0, x1,y1;
   int invert;
} stbtt__edge;

typedef struct stbtt__active_edge
{
   int x,dx;
   float ey;
   struct stbtt__active_edge *next;
   int valid;
} stbtt__active_edge;

#define FIXSHIFT   10
#define FIX        (1 << FIXSHIFT)
#define FIXMASK    (FIX-1)

static stbtt__active_edge *new_active(stbtt__edge *e, int off_x, float start_point, void *userdata)
{
   stbtt__active_edge *z = (stbtt__active_edge *) STBTT_malloc(sizeof(*z), userdata); // @TODO: make a pool of these!!!
   float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
   STBTT_assert(e->y0 <= start_point);
   if (!z) return z;
   // round dx down to avoid going too far
   if (dxdy < 0)
      z->dx = -STBTT_ifloor(FIX * -dxdy);
   else
      z->dx = STBTT_ifloor(FIX * dxdy);
   z->x = STBTT_ifloor(FIX * (e->x0 + dxdy * (start_point - e->y0)));
   z->x -= off_x * FIX;
   z->ey = e->y1;
   z->next = 0;
   z->valid = e->invert ? 1 : -1;
   return z;
}

// note: this routine clips fills that extend off the edges... ideally this
// wouldn't happen, but it could happen if the truetype glyph bounding boxes
// are wrong, or if the user supplies a too-small bitmap
static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight)
{
   // non-zero winding fill
   int x0=0, w=0;

   while (e) {
      if (w == 0) {
         // if we're currently at zero, we need to record the edge start point
         x0 = e->x; w += e->valid;
      } else {
         int x1 = e->x; w += e->valid;
         // if we went to zero, we need to draw
         if (w == 0) {
            int i = x0 >> FIXSHIFT;
            int j = x1 >> FIXSHIFT;

            if (i < len && j >= 0) {
               if (i == j) {
                  // x0,x1 are the same pixel, so compute combined coverage
                  scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> FIXSHIFT);
               } else {
                  if (i >= 0) // add antialiasing for x0
                     scanline[i] = scanline[i] + (stbtt_uint8) (((FIX - (x0 & FIXMASK)) * max_weight) >> FIXSHIFT);
                  else
                     i = -1; // clip

                  if (j < len) // add antialiasing for x1
                     scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & FIXMASK) * max_weight) >> FIXSHIFT);
                  else
                     j = len; // clip

                  for (++i; i < j; ++i) // fill pixels between x0 and x1
                     scanline[i] = scanline[i] + (stbtt_uint8) max_weight;
               }
            }
         }
      }

      e = e->next;
   }
}

static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
{
   stbtt__active_edge *active = NULL;
   int y,j=0;
   int max_weight = (255 / vsubsample);  // weight per vertical scanline
   int s; // vertical subsample index
   unsigned char scanline_data[512], *scanline;

   if (result->w > 512)
      scanline = (unsigned char *) STBTT_malloc(result->w, userdata);
   else
      scanline = scanline_data;

   y = off_y * vsubsample;
   e[n].y0 = (off_y + result->h) * (float) vsubsample + 1;

   while (j < result->h) {
      STBTT_memset(scanline, 0, result->w);
      for (s=0; s < vsubsample; ++s) {
         // find center of pixel for this scanline
         float scan_y = y + 0.5f;
         stbtt__active_edge **step = &active;

         // update all active edges;
         // remove all active edges that terminate before the center of this scanline
         while (*step) {
            stbtt__active_edge * z = *step;
            if (z->ey <= scan_y) {
               *step = z->next; // delete from list
               STBTT_assert(z->valid);
               z->valid = 0;
               STBTT_free(z, userdata);
            } else {
               z->x += z->dx; // advance to position for current scanline
               step = &((*step)->next); // advance through list
            }
         }

         // resort the list if needed
         for(;;) {
            int changed=0;
            step = &active;
            while (*step && (*step)->next) {
               if ((*step)->x > (*step)->next->x) {
                  stbtt__active_edge *t = *step;
                  stbtt__active_edge *q = t->next;

                  t->next = q->next;
                  q->next = t;
                  *step = q;
                  changed = 1;
               }
               step = &(*step)->next;
            }
            if (!changed) break;
         }

         // insert all edges that start before the center of this scanline -- omit ones that also end on this scanline
         while (e->y0 <= scan_y) {
            if (e->y1 > scan_y) {
               stbtt__active_edge *z = new_active(e, off_x, scan_y, userdata);
               // find insertion point
               if (active == NULL)
                  active = z;
               else if (z->x < active->x) {
                  // insert at front
                  z->next = active;
                  active = z;
               } else {
                  // find thing to insert AFTER
                  stbtt__active_edge *p = active;
                  while (p->next && p->next->x < z->x)
                     p = p->next;
                  // at this point, p->next->x is NOT < z->x
                  z->next = p->next;
                  p->next = z;
               }
            }
            ++e;
         }

         // now process all active edges in XOR fashion
         if (active)
            stbtt__fill_active_edges(scanline, result->w, active, max_weight);

         ++y;
      }
      STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w);
      ++j;
   }

   while (active) {
      stbtt__active_edge *z = active;
      active = active->next;
      STBTT_free(z, userdata);
   }

   if (scanline != scanline_data)
      STBTT_free(scanline, userdata);
}

static int stbtt__edge_compare(const void *p, const void *q)
{
   stbtt__edge *a = (stbtt__edge *) p;
   stbtt__edge *b = (stbtt__edge *) q;

   if (a->y0 < b->y0) return -1;
   if (a->y0 > b->y0) return  1;
   return 0;
}

typedef struct
{
   float x,y;
} stbtt__point;

static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcount, int windings, float scale_x, float scale_y, float shift_x, float shift_y, int off_x, int off_y, int invert, void *userdata)
{
   float y_scale_inv = invert ? -scale_y : scale_y;
   stbtt__edge *e;
   int n,i,j,k,m;
   int vsubsample = result->h < 8 ? 15 : 5;
   // vsubsample should divide 255 evenly; otherwise we won't reach full opacity

   // now we have to blow out the windings into explicit edge lists
   n = 0;
   for (i=0; i < windings; ++i)
      n += wcount[i];

   e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); // add an extra one as a sentinel
   if (e == 0) return;
   n = 0;

   m=0;
   for (i=0; i < windings; ++i) {
      stbtt__point *p = pts + m;
      m += wcount[i];
      j = wcount[i]-1;
      for (k=0; k < wcount[i]; j=k++) {
         int a=k,b=j;
         // skip the edge if horizontal
         if (p[j].y == p[k].y)
            continue;
         // add edge from j to k to the list
         e[n].invert = 0;
         if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) {
            e[n].invert = 1;
            a=j,b=k;
         }
         e[n].x0 = p[a].x * scale_x + shift_x;
         e[n].y0 = p[a].y * y_scale_inv * vsubsample + shift_y;
         e[n].x1 = p[b].x * scale_x + shift_x;
         e[n].y1 = p[b].y * y_scale_inv * vsubsample + shift_y;
         ++n;
      }
   }

   // now sort the edges by their highest point (should snap to integer, and then by x)
   STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare);

   // now, traverse the scanlines and find the intersections on each scanline, use xor winding rule
   stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata);

   STBTT_free(e, userdata);
}

static void stbtt__add_point(stbtt__point *points, int n, float x, float y)
{
   if (!points) return; // during first pass, it's unallocated
   points[n].x = x;
   points[n].y = y;
}

// tesselate until threshhold p is happy... @TODO warped to compensate for non-linear stretching
static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n)
{
   // midpoint
   float mx = (x0 + 2*x1 + x2)/4;
   float my = (y0 + 2*y1 + y2)/4;
   // versus directly drawn line
   float dx = (x0+x2)/2 - mx;
   float dy = (y0+y2)/2 - my;
   if (n > 16) // 65536 segments on one curve better be enough!
      return 1;
   if (dx*dx+dy*dy > objspace_flatness_squared) { // half-pixel error allowed... need to be smaller if AA
      stbtt__tesselate_curve(points, num_points, x0,y0, (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1);
      stbtt__tesselate_curve(points, num_points, mx,my, (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1);
   } else {
      stbtt__add_point(points, *num_points,x2,y2);
      *num_points = *num_points+1;
   }
   return 1;
}

// returns number of contours
stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata)
{
   stbtt__point *points=0;
   int num_points=0;

   float objspace_flatness_squared = objspace_flatness * objspace_flatness;
   int i,n=0,start=0, pass;

   // count how many "moves" there are to get the contour count
   for (i=0; i < num_verts; ++i)
      if (vertices[i].type == STBTT_vmove)
         ++n;

   *num_contours = n;
   if (n == 0) return 0;

   *contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata);

   if (*contour_lengths == 0) {
      *num_contours = 0;
      return 0;
   }

   // make two passes through the points so we don't need to realloc
   for (pass=0; pass < 2; ++pass) {
      float x=0,y=0;
      if (pass == 1) {
         points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata);
         if (points == NULL) goto error;
      }
      num_points = 0;
      n= -1;
      for (i=0; i < num_verts; ++i) {
         switch (vertices[i].type) {
            case STBTT_vmove:
               // start the next contour
               if (n >= 0)
                  (*contour_lengths)[n] = num_points - start;
               ++n;
               start = num_points;

               x = vertices[i].x, y = vertices[i].y;
               stbtt__add_point(points, num_points++, x,y);
               break;
            case STBTT_vline:
               x = vertices[i].x, y = vertices[i].y;
               stbtt__add_point(points, num_points++, x, y);
               break;
            case STBTT_vcurve:
               stbtt__tesselate_curve(points, &num_points, x,y,
                                        vertices[i].cx, vertices[i].cy,
                                        vertices[i].x,  vertices[i].y,
                                        objspace_flatness_squared, 0);
               x = vertices[i].x, y = vertices[i].y;
               break;
         }
      }
      (*contour_lengths)[n] = num_points - start;
   }

   return points;
error:
   STBTT_free(points, userdata);
   STBTT_free(*contour_lengths, userdata);
   *contour_lengths = 0;
   *num_contours = 0;
   return NULL;
}

void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata)
{
   float scale = scale_x > scale_y ? scale_y : scale_x;
   int winding_count, *winding_lengths;
   stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale, &winding_lengths, &winding_count, userdata);
   if (windings) {
      stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, userdata);
      STBTT_free(winding_lengths, userdata);
      STBTT_free(windings, userdata);
   }
}

void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata)
{
   STBTT_free(bitmap, userdata);
}

unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff)
{
   int ix0,iy0,ix1,iy1;
   stbtt__bitmap gbm;
   stbtt_vertex *vertices;
   int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);

   if (scale_x == 0) scale_x = scale_y;
   if (scale_y == 0) {
      if (scale_x == 0) return NULL;
      scale_y = scale_x;
   }

   stbtt_GetGlyphBitmapBox(info, glyph, scale_x, scale_y, &ix0,&iy0,&ix1,&iy1);

   // now we get the size
   gbm.w = (ix1 - ix0);
   gbm.h = (iy1 - iy0);
   gbm.pixels = NULL; // in case we error

   if (width ) *width  = gbm.w;
   if (height) *height = gbm.h;
   if (xoff  ) *xoff   = ix0;
   if (yoff  ) *yoff   = iy0;

   if (gbm.w && gbm.h) {
      gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata);
      if (gbm.pixels) {
         gbm.stride = gbm.w;

         stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, 1, info->userdata);
      }
   }
   STBTT_free(vertices, info->userdata);
   return gbm.pixels;
}

unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff)
{
   return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, 0.0f, 0.0f, glyph, width, height, xoff, yoff);
}

void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph)
{
   int ix0,iy0;
   stbtt_vertex *vertices;
   int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
   stbtt__bitmap gbm;

   stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,0,0);
   gbm.pixels = output;
   gbm.w = out_w;
   gbm.h = out_h;
   gbm.stride = out_stride;

   if (gbm.w && gbm.h)
      stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0,iy0, 1, info->userdata);

   STBTT_free(vertices, info->userdata);
}

void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph)
{
   stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, glyph);
}

unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
{
   return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, stbtt_FindGlyphIndex(info,codepoint), width,height,xoff,yoff);
}

void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint)
{
   stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, stbtt_FindGlyphIndex(info,codepoint));
}

unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
{
   return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, 0.0f,0.0f, codepoint, width,height,xoff,yoff);
}

void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint)
{
   stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, codepoint);
}

//////////////////////////////////////////////////////////////////////////////
//
// bitmap baking
//
// This is SUPER-CRAPPY packing to keep source code small

extern int stbtt_BakeFontBitmap(const unsigned char *data, int offset,  // font location (use offset=0 for plain .ttf)
                                float pixel_height,                     // height of font in pixels
                                unsigned char *pixels, int pw, int ph,  // bitmap to be filled in
                                int first_char, int num_chars,          // characters to bake
                                stbtt_bakedchar *chardata)
{
   float scale;
   int x,y,bottom_y, i;
   stbtt_fontinfo f;
   stbtt_InitFont(&f, data, offset);
   STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
   x=y=1;
   bottom_y = 1;

   scale = stbtt_ScaleForPixelHeight(&f, pixel_height);

   for (i=0; i < num_chars; ++i) {
      int advance, lsb, x0,y0,x1,y1,gw,gh;
      int g = stbtt_FindGlyphIndex(&f, first_char + i);
      stbtt_GetGlyphHMetrics(&f, g, &advance, &lsb);
      stbtt_GetGlyphBitmapBox(&f, g, scale,scale, &x0,&y0,&x1,&y1);
      gw = x1-x0;
      gh = y1-y0;
      if (x + gw + 1 >= pw)
         y = bottom_y, x = 1; // advance to next row
      if (y + gh + 1 >= ph) // check if it fits vertically AFTER potentially moving to next row
         return -i;
      STBTT_assert(x+gw < pw);
      STBTT_assert(y+gh < ph);
      stbtt_MakeGlyphBitmap(&f, pixels+x+y*pw, gw,gh,pw, scale,scale, g);
      chardata[i].x0 = (stbtt_int16) x;
      chardata[i].y0 = (stbtt_int16) y;
      chardata[i].x1 = (stbtt_int16) (x + gw);
      chardata[i].y1 = (stbtt_int16) (y + gh);
      chardata[i].xadvance = scale * advance;
      chardata[i].xoff     = (float) x0;
      chardata[i].yoff     = (float) y0;
      x = x + gw + 2;
      if (y+gh+2 > bottom_y)
         bottom_y = y+gh+2;
   }
   return bottom_y;
}

void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule)
{
   float d3d_bias = opengl_fillrule ? 0 : -0.5f;
   float ipw = 1.0f / pw, iph = 1.0f / ph;
   stbtt_bakedchar *b = chardata + char_index;
   int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5);
   int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5);

   q->x0 = round_x + d3d_bias;
   q->y0 = round_y + d3d_bias;
   q->x1 = round_x + b->x1 - b->x0 + d3d_bias;
   q->y1 = round_y + b->y1 - b->y0 + d3d_bias;

   q->s0 = b->x0 * ipw;
   q->t0 = b->y0 * iph;
   q->s1 = b->x1 * ipw;
   q->t1 = b->y1 * iph;

   *xpos += b->xadvance;
}

//////////////////////////////////////////////////////////////////////////////
//
// font name matching -- recommended not to use this
//

// check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string
static stbtt_int32 stbtt__CompareUTF8toUTF16_bigendian_prefix(const stbtt_uint8 *s1, stbtt_int32 len1, const stbtt_uint8 *s2, stbtt_int32 len2)
{
   stbtt_int32 i=0;

   // convert utf16 to utf8 and compare the results while converting
   while (len2) {
      stbtt_uint16 ch = s2[0]*256 + s2[1];
      if (ch < 0x80) {
         if (i >= len1) return -1;
         if (s1[i++] != ch) return -1;
      } else if (ch < 0x800) {
         if (i+1 >= len1) return -1;
         if (s1[i++] != 0xc0 + (ch >> 6)) return -1;
         if (s1[i++] != 0x80 + (ch & 0x3f)) return -1;
      } else if (ch >= 0xd800 && ch < 0xdc00) {
         stbtt_uint32 c;
         stbtt_uint16 ch2 = s2[2]*256 + s2[3];
         if (i+3 >= len1) return -1;
         c = ((ch - 0xd800) << 10) + (ch2 - 0xdc00) + 0x10000;
         if (s1[i++] != 0xf0 + (c >> 18)) return -1;
         if (s1[i++] != 0x80 + ((c >> 12) & 0x3f)) return -1;
         if (s1[i++] != 0x80 + ((c >>  6) & 0x3f)) return -1;
         if (s1[i++] != 0x80 + ((c      ) & 0x3f)) return -1;
         s2 += 2; // plus another 2 below
         len2 -= 2;
      } else if (ch >= 0xdc00 && ch < 0xe000) {
         return -1;
      } else {
         if (i+2 >= len1) return -1;
         if (s1[i++] != 0xe0 + (ch >> 12)) return -1;
         if (s1[i++] != 0x80 + ((ch >> 6) & 0x3f)) return -1;
         if (s1[i++] != 0x80 + ((ch     ) & 0x3f)) return -1;
      }
      s2 += 2;
      len2 -= 2;
   }
   return i;
}

int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2)
{
   return len1 == stbtt__CompareUTF8toUTF16_bigendian_prefix((const stbtt_uint8*) s1, len1, (const stbtt_uint8*) s2, len2);
}

// returns results in whatever encoding you request... but note that 2-byte encodings
// will be BIG-ENDIAN... use stbtt_CompareUTF8toUTF16_bigendian() to compare
const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID)
{
   stbtt_int32 i,count,stringOffset;
   stbtt_uint8 *fc = font->data;
   stbtt_uint32 offset = font->fontstart;
   stbtt_uint32 nm = stbtt__find_table(fc, offset, "name");
   if (!nm) return NULL;

   count = ttUSHORT(fc+nm+2);
   stringOffset = nm + ttUSHORT(fc+nm+4);
   for (i=0; i < count; ++i) {
      stbtt_uint32 loc = nm + 6 + 12 * i;
      if (platformID == ttUSHORT(fc+loc+0) && encodingID == ttUSHORT(fc+loc+2)
          && languageID == ttUSHORT(fc+loc+4) && nameID == ttUSHORT(fc+loc+6)) {
         *length = ttUSHORT(fc+loc+8);
         return (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10));
      }
   }
   return NULL;
}

static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id)
{
   stbtt_int32 i;
   stbtt_int32 count = ttUSHORT(fc+nm+2);
   stbtt_int32 stringOffset = nm + ttUSHORT(fc+nm+4);

   for (i=0; i < count; ++i) {
      stbtt_uint32 loc = nm + 6 + 12 * i;
      stbtt_int32 id = ttUSHORT(fc+loc+6);
      if (id == target_id) {
         // find the encoding
         stbtt_int32 platform = ttUSHORT(fc+loc+0), encoding = ttUSHORT(fc+loc+2), language = ttUSHORT(fc+loc+4);

         // is this a Unicode encoding?
         if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) {
            stbtt_int32 slen = ttUSHORT(fc+loc+8), off = ttUSHORT(fc+loc+10);

            // check if there's a prefix match
            stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen);
            if (matchlen >= 0) {
               // check for target_id+1 immediately following, with same encoding & language
               if (i+1 < count && ttUSHORT(fc+loc+12+6) == next_id && ttUSHORT(fc+loc+12) == platform && ttUSHORT(fc+loc+12+2) == encoding && ttUSHORT(fc+loc+12+4) == language) {
                  stbtt_int32 slen = ttUSHORT(fc+loc+12+8), off = ttUSHORT(fc+loc+12+10);
                  if (slen == 0) {
                     if (matchlen == nlen)
                        return 1;
                  } else if (matchlen < nlen && name[matchlen] == ' ') {
                     ++matchlen;
                     if (stbtt_CompareUTF8toUTF16_bigendian((char*) (name+matchlen), nlen-matchlen, (char*)(fc+stringOffset+off),slen))
                        return 1;
                  }
               } else {
                  // if nothing immediately following
                  if (matchlen == nlen)
                     return 1;
               }
            }
         }

         // @TODO handle other encodings
      }
   }
   return 0;
}

static int stbtt__matches(stbtt_uint8 *fc, stbtt_uint32 offset, stbtt_uint8 *name, stbtt_int32 flags)
{
   stbtt_int32 nlen = (stbtt_int32) STBTT_strlen((char *) name);
   stbtt_uint32 nm,hd;
   if (!stbtt__isfont(fc+offset)) return 0;

   // check italics/bold/underline flags in macStyle...
   if (flags) {
      hd = stbtt__find_table(fc, offset, "head");
      if ((ttUSHORT(fc+hd+44) & 7) != (flags & 7)) return 0;
   }

   nm = stbtt__find_table(fc, offset, "name");
   if (!nm) return 0;

   if (flags) {
      // if we checked the macStyle flags, then just check the family and ignore the subfamily
      if (stbtt__matchpair(fc, nm, name, nlen, 16, -1))  return 1;
      if (stbtt__matchpair(fc, nm, name, nlen,  1, -1))  return 1;
      if (stbtt__matchpair(fc, nm, name, nlen,  3, -1))  return 1;
   } else {
      if (stbtt__matchpair(fc, nm, name, nlen, 16, 17))  return 1;
      if (stbtt__matchpair(fc, nm, name, nlen,  1,  2))  return 1;
      if (stbtt__matchpair(fc, nm, name, nlen,  3, -1))  return 1;
   }

   return 0;
}

int stbtt_FindMatchingFont(const unsigned char *font_collection, const char *name_utf8, stbtt_int32 flags)
{
   stbtt_int32 i;
   for (i=0;;++i) {
      stbtt_int32 off = stbtt_GetFontOffsetForIndex(font_collection, i);
      if (off < 0) return off;
      if (stbtt__matches((stbtt_uint8 *) font_collection, off, (stbtt_uint8*) name_utf8, flags))
         return off;
   }
}

#endif // STB_TRUETYPE_IMPLEMENTATION

Added ext/soil/SOIL.c.





















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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/*
	Jonathan Dummer
	2007-07-26-10.36

	Simple OpenGL Image Library

	Public Domain
	using Sean Barret's stb_image as a base

	Thanks to:
	* Sean Barret - for the awesome stb_image
	* Dan Venkitachalam - for finding some non-compliant DDS files, and patching some explicit casts
	* everybody at gamedev.net
*/

#define SOIL_CHECK_FOR_GL_ERRORS 0

#ifdef WIN32
	#define WIN32_LEAN_AND_MEAN
	#include <windows.h>
	#include <wingdi.h>
	#include <GL/gl.h>
#elif defined(__APPLE__) || defined(__APPLE_CC__)
	/*	I can't test this Apple stuff!	*/
	#include <OpenGL/gl.h>
	#include <Carbon/Carbon.h>
	#define APIENTRY
#else
	#include <GL/gl.h>
	#include <GL/glx.h>
#endif

#include "SOIL.h"
#include "stb_image_aug.h"
#include "image_helper.h"
#include "image_DXT.h"

#include <stdlib.h>
#include <string.h>

/*	error reporting	*/
char *result_string_pointer = "SOIL initialized";

/*	for loading cube maps	*/
enum{
	SOIL_CAPABILITY_UNKNOWN = -1,
	SOIL_CAPABILITY_NONE = 0,
	SOIL_CAPABILITY_PRESENT = 1
};
static int has_cubemap_capability = SOIL_CAPABILITY_UNKNOWN;
int query_cubemap_capability( void );
#define SOIL_TEXTURE_WRAP_R					0x8072
#define SOIL_CLAMP_TO_EDGE					0x812F
#define SOIL_NORMAL_MAP						0x8511
#define SOIL_REFLECTION_MAP					0x8512
#define SOIL_TEXTURE_CUBE_MAP				0x8513
#define SOIL_TEXTURE_BINDING_CUBE_MAP		0x8514
#define SOIL_TEXTURE_CUBE_MAP_POSITIVE_X	0x8515
#define SOIL_TEXTURE_CUBE_MAP_NEGATIVE_X	0x8516
#define SOIL_TEXTURE_CUBE_MAP_POSITIVE_Y	0x8517
#define SOIL_TEXTURE_CUBE_MAP_NEGATIVE_Y	0x8518
#define SOIL_TEXTURE_CUBE_MAP_POSITIVE_Z	0x8519
#define SOIL_TEXTURE_CUBE_MAP_NEGATIVE_Z	0x851A
#define SOIL_PROXY_TEXTURE_CUBE_MAP			0x851B
#define SOIL_MAX_CUBE_MAP_TEXTURE_SIZE		0x851C
/*	for non-power-of-two texture	*/
static int has_NPOT_capability = SOIL_CAPABILITY_UNKNOWN;
int query_NPOT_capability( void );
/*	for texture rectangles	*/
static int has_tex_rectangle_capability = SOIL_CAPABILITY_UNKNOWN;
int query_tex_rectangle_capability( void );
#define SOIL_TEXTURE_RECTANGLE_ARB				0x84F5
#define SOIL_MAX_RECTANGLE_TEXTURE_SIZE_ARB		0x84F8
/*	for using DXT compression	*/
static int has_DXT_capability = SOIL_CAPABILITY_UNKNOWN;
int query_DXT_capability( void );
#define SOIL_RGB_S3TC_DXT1		0x83F0
#define SOIL_RGBA_S3TC_DXT1		0x83F1
#define SOIL_RGBA_S3TC_DXT3		0x83F2
#define SOIL_RGBA_S3TC_DXT5		0x83F3
typedef void (APIENTRY * P_SOIL_GLCOMPRESSEDTEXIMAGE2DPROC) (GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, const GLvoid * data);
P_SOIL_GLCOMPRESSEDTEXIMAGE2DPROC soilGlCompressedTexImage2D = NULL;
unsigned int SOIL_direct_load_DDS(
		const char *filename,
		unsigned int reuse_texture_ID,
		int flags,
		int loading_as_cubemap );
unsigned int SOIL_direct_load_DDS_from_memory(
		const unsigned char *const buffer,
		int buffer_length,
		unsigned int reuse_texture_ID,
		int flags,
		int loading_as_cubemap );
/*	other functions	*/
unsigned int
	SOIL_internal_create_OGL_texture
	(
		const unsigned char *const data,
		int width, int height, int channels,
		unsigned int reuse_texture_ID,
		unsigned int flags,
		unsigned int opengl_texture_type,
		unsigned int opengl_texture_target,
		unsigned int texture_check_size_enum
	);

/*	and the code magic begins here [8^)	*/
unsigned int
	SOIL_load_OGL_texture
	(
		const char *filename,
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	)
{
	/*	variables	*/
	unsigned char* img;
	int width, height, channels;
	unsigned int tex_id;
	/*	does the user want direct uploading of the image as a DDS file?	*/
	if( flags & SOIL_FLAG_DDS_LOAD_DIRECT )
	{
		/*	1st try direct loading of the image as a DDS file
			note: direct uploading will only load what is in the
			DDS file, no MIPmaps will be generated, the image will
			not be flipped, etc.	*/
		tex_id = SOIL_direct_load_DDS( filename, reuse_texture_ID, flags, 0 );
		if( tex_id )
		{
			/*	hey, it worked!!	*/
			return tex_id;
		}
	}
	/*	try to load the image	*/
	img = SOIL_load_image( filename, &width, &height, &channels, force_channels );
	/*	channels holds the original number of channels, which may have been forced	*/
	if( (force_channels >= 1) && (force_channels <= 4) )
	{
		channels = force_channels;
	}
	if( NULL == img )
	{
		/*	image loading failed	*/
		result_string_pointer = stbi_failure_reason();
		return 0;
	}
	/*	OK, make it a texture!	*/
	tex_id = SOIL_internal_create_OGL_texture(
			img, width, height, channels,
			reuse_texture_ID, flags,
			GL_TEXTURE_2D, GL_TEXTURE_2D,
			GL_MAX_TEXTURE_SIZE );
	/*	and nuke the image data	*/
	SOIL_free_image_data( img );
	/*	and return the handle, such as it is	*/
	return tex_id;
}

unsigned int
	SOIL_load_OGL_HDR_texture
	(
		const char *filename,
		int fake_HDR_format,
		int rescale_to_max,
		unsigned int reuse_texture_ID,
		unsigned int flags
	)
{
	/*	variables	*/
	unsigned char* img;
	int width, height, channels;
	unsigned int tex_id;
	/*	no direct uploading of the image as a DDS file	*/
	/* error check */
	if( (fake_HDR_format != SOIL_HDR_RGBE) &&
		(fake_HDR_format != SOIL_HDR_RGBdivA) &&
		(fake_HDR_format != SOIL_HDR_RGBdivA2) )
	{
		result_string_pointer = "Invalid fake HDR format specified";
		return 0;
	}
	/*	try to load the image (only the HDR type) */
	img = stbi_hdr_load_rgbe( filename, &width, &height, &channels, 4 );
	/*	channels holds the original number of channels, which may have been forced	*/
	if( NULL == img )
	{
		/*	image loading failed	*/
		result_string_pointer = stbi_failure_reason();
		return 0;
	}
	/* the load worked, do I need to convert it? */
	if( fake_HDR_format == SOIL_HDR_RGBdivA )
	{
		RGBE_to_RGBdivA( img, width, height, rescale_to_max );
	} else if( fake_HDR_format == SOIL_HDR_RGBdivA2 )
	{
		RGBE_to_RGBdivA2( img, width, height, rescale_to_max );
	}
	/*	OK, make it a texture!	*/
	tex_id = SOIL_internal_create_OGL_texture(
			img, width, height, channels,
			reuse_texture_ID, flags,
			GL_TEXTURE_2D, GL_TEXTURE_2D,
			GL_MAX_TEXTURE_SIZE );
	/*	and nuke the image data	*/
	SOIL_free_image_data( img );
	/*	and return the handle, such as it is	*/
	return tex_id;
}

unsigned int
	SOIL_load_OGL_texture_from_memory
	(
		const unsigned char *const buffer,
		int buffer_length,
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags,
		int* rw, int* rh
	)
{
	/*	variables	*/
	unsigned char* img;
	int width, height, channels;
	unsigned int tex_id;
	/*	does the user want direct uploading of the image as a DDS file?	*/
	if( flags & SOIL_FLAG_DDS_LOAD_DIRECT )
	{
		/*	1st try direct loading of the image as a DDS file
			note: direct uploading will only load what is in the
			DDS file, no MIPmaps will be generated, the image will
			not be flipped, etc.	*/
		tex_id = SOIL_direct_load_DDS_from_memory(
				buffer, buffer_length,
				reuse_texture_ID, flags, 0 );
		if( tex_id )
		{
			/*	hey, it worked!!	*/
			return tex_id;
		}
	}
	/*	try to load the image	*/
	img = SOIL_load_image_from_memory(
					buffer, buffer_length,
					&width, &height, &channels,
					force_channels );
	*rw = width; *rh = height;
	/*	channels holds the original number of channels, which may have been forced	*/
	if( (force_channels >= 1) && (force_channels <= 4) )
	{
		channels = force_channels;
	}
	if( NULL == img )
	{
		/*	image loading failed	*/
		result_string_pointer = stbi_failure_reason();
		return 0;
	}
	/*	OK, make it a texture!	*/
	tex_id = SOIL_internal_create_OGL_texture(
			img, width, height, channels,
			reuse_texture_ID, flags,
			GL_TEXTURE_2D, GL_TEXTURE_2D,
			GL_MAX_TEXTURE_SIZE );
	/*	and nuke the image data	*/
	SOIL_free_image_data( img );
	/*	and return the handle, such as it is	*/
	return tex_id;
}

unsigned int
	SOIL_load_OGL_cubemap
	(
		const char *x_pos_file,
		const char *x_neg_file,
		const char *y_pos_file,
		const char *y_neg_file,
		const char *z_pos_file,
		const char *z_neg_file,
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	)
{
	/*	variables	*/
	unsigned char* img;
	int width, height, channels;
	unsigned int tex_id;
	/*	error checking	*/
	if( (x_pos_file == NULL) ||
		(x_neg_file == NULL) ||
		(y_pos_file == NULL) ||
		(y_neg_file == NULL) ||
		(z_pos_file == NULL) ||
		(z_neg_file == NULL) )
	{
		result_string_pointer = "Invalid cube map files list";
		return 0;
	}
	/*	capability checking	*/
	if( query_cubemap_capability() != SOIL_CAPABILITY_PRESENT )
	{
		result_string_pointer = "No cube map capability present";
		return 0;
	}
	/*	1st face: try to load the image	*/
	img = SOIL_load_image( x_pos_file, &width, &height, &channels, force_channels );
	/*	channels holds the original number of channels, which may have been forced	*/
	if( (force_channels >= 1) && (force_channels <= 4) )
	{
		channels = force_channels;
	}
	if( NULL == img )
	{
		/*	image loading failed	*/
		result_string_pointer = stbi_failure_reason();
		return 0;
	}
	/*	upload the texture, and create a texture ID if necessary	*/
	tex_id = SOIL_internal_create_OGL_texture(
			img, width, height, channels,
			reuse_texture_ID, flags,
			SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_POSITIVE_X,
			SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
	/*	and nuke the image data	*/
	SOIL_free_image_data( img );
	/*	continue?	*/
	if( tex_id != 0 )
	{
		/*	1st face: try to load the image	*/
		img = SOIL_load_image( x_neg_file, &width, &height, &channels, force_channels );
		/*	channels holds the original number of channels, which may have been forced	*/
		if( (force_channels >= 1) && (force_channels <= 4) )
		{
			channels = force_channels;
		}
		if( NULL == img )
		{
			/*	image loading failed	*/
			result_string_pointer = stbi_failure_reason();
			return 0;
		}
		/*	upload the texture, but reuse the assigned texture ID	*/
		tex_id = SOIL_internal_create_OGL_texture(
				img, width, height, channels,
				tex_id, flags,
				SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_NEGATIVE_X,
				SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
		/*	and nuke the image data	*/
		SOIL_free_image_data( img );
	}
	/*	continue?	*/
	if( tex_id != 0 )
	{
		/*	1st face: try to load the image	*/
		img = SOIL_load_image( y_pos_file, &width, &height, &channels, force_channels );
		/*	channels holds the original number of channels, which may have been forced	*/
		if( (force_channels >= 1) && (force_channels <= 4) )
		{
			channels = force_channels;
		}
		if( NULL == img )
		{
			/*	image loading failed	*/
			result_string_pointer = stbi_failure_reason();
			return 0;
		}
		/*	upload the texture, but reuse the assigned texture ID	*/
		tex_id = SOIL_internal_create_OGL_texture(
				img, width, height, channels,
				tex_id, flags,
				SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_POSITIVE_Y,
				SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
		/*	and nuke the image data	*/
		SOIL_free_image_data( img );
	}
	/*	continue?	*/
	if( tex_id != 0 )
	{
		/*	1st face: try to load the image	*/
		img = SOIL_load_image( y_neg_file, &width, &height, &channels, force_channels );
		/*	channels holds the original number of channels, which may have been forced	*/
		if( (force_channels >= 1) && (force_channels <= 4) )
		{
			channels = force_channels;
		}
		if( NULL == img )
		{
			/*	image loading failed	*/
			result_string_pointer = stbi_failure_reason();
			return 0;
		}
		/*	upload the texture, but reuse the assigned texture ID	*/
		tex_id = SOIL_internal_create_OGL_texture(
				img, width, height, channels,
				tex_id, flags,
				SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
				SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
		/*	and nuke the image data	*/
		SOIL_free_image_data( img );
	}
	/*	continue?	*/
	if( tex_id != 0 )
	{
		/*	1st face: try to load the image	*/
		img = SOIL_load_image( z_pos_file, &width, &height, &channels, force_channels );
		/*	channels holds the original number of channels, which may have been forced	*/
		if( (force_channels >= 1) && (force_channels <= 4) )
		{
			channels = force_channels;
		}
		if( NULL == img )
		{
			/*	image loading failed	*/
			result_string_pointer = stbi_failure_reason();
			return 0;
		}
		/*	upload the texture, but reuse the assigned texture ID	*/
		tex_id = SOIL_internal_create_OGL_texture(
				img, width, height, channels,
				tex_id, flags,
				SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_POSITIVE_Z,
				SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
		/*	and nuke the image data	*/
		SOIL_free_image_data( img );
	}
	/*	continue?	*/
	if( tex_id != 0 )
	{
		/*	1st face: try to load the image	*/
		img = SOIL_load_image( z_neg_file, &width, &height, &channels, force_channels );
		/*	channels holds the original number of channels, which may have been forced	*/
		if( (force_channels >= 1) && (force_channels <= 4) )
		{
			channels = force_channels;
		}
		if( NULL == img )
		{
			/*	image loading failed	*/
			result_string_pointer = stbi_failure_reason();
			return 0;
		}
		/*	upload the texture, but reuse the assigned texture ID	*/
		tex_id = SOIL_internal_create_OGL_texture(
				img, width, height, channels,
				tex_id, flags,
				SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
				SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
		/*	and nuke the image data	*/
		SOIL_free_image_data( img );
	}
	/*	and return the handle, such as it is	*/
	return tex_id;
}

unsigned int
	SOIL_load_OGL_cubemap_from_memory
	(
		const unsigned char *const x_pos_buffer,
		int x_pos_buffer_length,
		const unsigned char *const x_neg_buffer,
		int x_neg_buffer_length,
		const unsigned char *const y_pos_buffer,
		int y_pos_buffer_length,
		const unsigned char *const y_neg_buffer,
		int y_neg_buffer_length,
		const unsigned char *const z_pos_buffer,
		int z_pos_buffer_length,
		const unsigned char *const z_neg_buffer,
		int z_neg_buffer_length,
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	)
{
	/*	variables	*/
	unsigned char* img;
	int width, height, channels;
	unsigned int tex_id;
	/*	error checking	*/
	if( (x_pos_buffer == NULL) ||
		(x_neg_buffer == NULL) ||
		(y_pos_buffer == NULL) ||
		(y_neg_buffer == NULL) ||
		(z_pos_buffer == NULL) ||
		(z_neg_buffer == NULL) )
	{
		result_string_pointer = "Invalid cube map buffers list";
		return 0;
	}
	/*	capability checking	*/
	if( query_cubemap_capability() != SOIL_CAPABILITY_PRESENT )
	{
		result_string_pointer = "No cube map capability present";
		return 0;
	}
	/*	1st face: try to load the image	*/
	img = SOIL_load_image_from_memory(
			x_pos_buffer, x_pos_buffer_length,
			&width, &height, &channels, force_channels );
	/*	channels holds the original number of channels, which may have been forced	*/
	if( (force_channels >= 1) && (force_channels <= 4) )
	{
		channels = force_channels;
	}
	if( NULL == img )
	{
		/*	image loading failed	*/
		result_string_pointer = stbi_failure_reason();
		return 0;
	}
	/*	upload the texture, and create a texture ID if necessary	*/
	tex_id = SOIL_internal_create_OGL_texture(
			img, width, height, channels,
			reuse_texture_ID, flags,
			SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_POSITIVE_X,
			SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
	/*	and nuke the image data	*/
	SOIL_free_image_data( img );
	/*	continue?	*/
	if( tex_id != 0 )
	{
		/*	1st face: try to load the image	*/
		img = SOIL_load_image_from_memory(
				x_neg_buffer, x_neg_buffer_length,
				&width, &height, &channels, force_channels );
		/*	channels holds the original number of channels, which may have been forced	*/
		if( (force_channels >= 1) && (force_channels <= 4) )
		{
			channels = force_channels;
		}
		if( NULL == img )
		{
			/*	image loading failed	*/
			result_string_pointer = stbi_failure_reason();
			return 0;
		}
		/*	upload the texture, but reuse the assigned texture ID	*/
		tex_id = SOIL_internal_create_OGL_texture(
				img, width, height, channels,
				tex_id, flags,
				SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_NEGATIVE_X,
				SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
		/*	and nuke the image data	*/
		SOIL_free_image_data( img );
	}
	/*	continue?	*/
	if( tex_id != 0 )
	{
		/*	1st face: try to load the image	*/
		img = SOIL_load_image_from_memory(
				y_pos_buffer, y_pos_buffer_length,
				&width, &height, &channels, force_channels );
		/*	channels holds the original number of channels, which may have been forced	*/
		if( (force_channels >= 1) && (force_channels <= 4) )
		{
			channels = force_channels;
		}
		if( NULL == img )
		{
			/*	image loading failed	*/
			result_string_pointer = stbi_failure_reason();
			return 0;
		}
		/*	upload the texture, but reuse the assigned texture ID	*/
		tex_id = SOIL_internal_create_OGL_texture(
				img, width, height, channels,
				tex_id, flags,
				SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_POSITIVE_Y,
				SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
		/*	and nuke the image data	*/
		SOIL_free_image_data( img );
	}
	/*	continue?	*/
	if( tex_id != 0 )
	{
		/*	1st face: try to load the image	*/
		img = SOIL_load_image_from_memory(
				y_neg_buffer, y_neg_buffer_length,
				&width, &height, &channels, force_channels );
		/*	channels holds the original number of channels, which may have been forced	*/
		if( (force_channels >= 1) && (force_channels <= 4) )
		{
			channels = force_channels;
		}
		if( NULL == img )
		{
			/*	image loading failed	*/
			result_string_pointer = stbi_failure_reason();
			return 0;
		}
		/*	upload the texture, but reuse the assigned texture ID	*/
		tex_id = SOIL_internal_create_OGL_texture(
				img, width, height, channels,
				tex_id, flags,
				SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
				SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
		/*	and nuke the image data	*/
		SOIL_free_image_data( img );
	}
	/*	continue?	*/
	if( tex_id != 0 )
	{
		/*	1st face: try to load the image	*/
		img = SOIL_load_image_from_memory(
				z_pos_buffer, z_pos_buffer_length,
				&width, &height, &channels, force_channels );
		/*	channels holds the original number of channels, which may have been forced	*/
		if( (force_channels >= 1) && (force_channels <= 4) )
		{
			channels = force_channels;
		}
		if( NULL == img )
		{
			/*	image loading failed	*/
			result_string_pointer = stbi_failure_reason();
			return 0;
		}
		/*	upload the texture, but reuse the assigned texture ID	*/
		tex_id = SOIL_internal_create_OGL_texture(
				img, width, height, channels,
				tex_id, flags,
				SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_POSITIVE_Z,
				SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
		/*	and nuke the image data	*/
		SOIL_free_image_data( img );
	}
	/*	continue?	*/
	if( tex_id != 0 )
	{
		/*	1st face: try to load the image	*/
		img = SOIL_load_image_from_memory(
				z_neg_buffer, z_neg_buffer_length,
				&width, &height, &channels, force_channels );
		/*	channels holds the original number of channels, which may have been forced	*/
		if( (force_channels >= 1) && (force_channels <= 4) )
		{
			channels = force_channels;
		}
		if( NULL == img )
		{
			/*	image loading failed	*/
			result_string_pointer = stbi_failure_reason();
			return 0;
		}
		/*	upload the texture, but reuse the assigned texture ID	*/
		tex_id = SOIL_internal_create_OGL_texture(
				img, width, height, channels,
				tex_id, flags,
				SOIL_TEXTURE_CUBE_MAP, SOIL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
				SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
		/*	and nuke the image data	*/
		SOIL_free_image_data( img );
	}
	/*	and return the handle, such as it is	*/
	return tex_id;
}

unsigned int
	SOIL_load_OGL_single_cubemap
	(
		const char *filename,
		const char face_order[6],
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	)
{
	/*	variables	*/
	unsigned char* img;
	int width, height, channels, i;
	unsigned int tex_id = 0;
	/*	error checking	*/
	if( filename == NULL )
	{
		result_string_pointer = "Invalid single cube map file name";
		return 0;
	}
	/*	does the user want direct uploading of the image as a DDS file?	*/
	if( flags & SOIL_FLAG_DDS_LOAD_DIRECT )
	{
		/*	1st try direct loading of the image as a DDS file
			note: direct uploading will only load what is in the
			DDS file, no MIPmaps will be generated, the image will
			not be flipped, etc.	*/
		tex_id = SOIL_direct_load_DDS( filename, reuse_texture_ID, flags, 1 );
		if( tex_id )
		{
			/*	hey, it worked!!	*/
			return tex_id;
		}
	}
	/*	face order checking	*/
	for( i = 0; i < 6; ++i )
	{
		if( (face_order[i] != 'N') &&
			(face_order[i] != 'S') &&
			(face_order[i] != 'W') &&
			(face_order[i] != 'E') &&
			(face_order[i] != 'U') &&
			(face_order[i] != 'D') )
		{
			result_string_pointer = "Invalid single cube map face order";
			return 0;
		};
	}
	/*	capability checking	*/
	if( query_cubemap_capability() != SOIL_CAPABILITY_PRESENT )
	{
		result_string_pointer = "No cube map capability present";
		return 0;
	}
	/*	1st off, try to load the full image	*/
	img = SOIL_load_image( filename, &width, &height, &channels, force_channels );
	/*	channels holds the original number of channels, which may have been forced	*/
	if( (force_channels >= 1) && (force_channels <= 4) )
	{
		channels = force_channels;
	}
	if( NULL == img )
	{
		/*	image loading failed	*/
		result_string_pointer = stbi_failure_reason();
		return 0;
	}
	/*	now, does this image have the right dimensions?	*/
	if( (width != 6*height) &&
		(6*width != height) )
	{
		SOIL_free_image_data( img );
		result_string_pointer = "Single cubemap image must have a 6:1 ratio";
		return 0;
	}
	/*	try the image split and create	*/
	tex_id = SOIL_create_OGL_single_cubemap(
			img, width, height, channels,
			face_order, reuse_texture_ID, flags
			);
	/*	nuke the temporary image data and return the texture handle	*/
	SOIL_free_image_data( img );
	return tex_id;
}

unsigned int
	SOIL_load_OGL_single_cubemap_from_memory
	(
		const unsigned char *const buffer,
		int buffer_length,
		const char face_order[6],
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	)
{
	/*	variables	*/
	unsigned char* img;
	int width, height, channels, i;
	unsigned int tex_id = 0;
	/*	error checking	*/
	if( buffer == NULL )
	{
		result_string_pointer = "Invalid single cube map buffer";
		return 0;
	}
	/*	does the user want direct uploading of the image as a DDS file?	*/
	if( flags & SOIL_FLAG_DDS_LOAD_DIRECT )
	{
		/*	1st try direct loading of the image as a DDS file
			note: direct uploading will only load what is in the
			DDS file, no MIPmaps will be generated, the image will
			not be flipped, etc.	*/
		tex_id = SOIL_direct_load_DDS_from_memory(
				buffer, buffer_length,
				reuse_texture_ID, flags, 1 );
		if( tex_id )
		{
			/*	hey, it worked!!	*/
			return tex_id;
		}
	}
	/*	face order checking	*/
	for( i = 0; i < 6; ++i )
	{
		if( (face_order[i] != 'N') &&
			(face_order[i] != 'S') &&
			(face_order[i] != 'W') &&
			(face_order[i] != 'E') &&
			(face_order[i] != 'U') &&
			(face_order[i] != 'D') )
		{
			result_string_pointer = "Invalid single cube map face order";
			return 0;
		};
	}
	/*	capability checking	*/
	if( query_cubemap_capability() != SOIL_CAPABILITY_PRESENT )
	{
		result_string_pointer = "No cube map capability present";
		return 0;
	}
	/*	1st off, try to load the full image	*/
	img = SOIL_load_image_from_memory(
			buffer, buffer_length,
			&width, &height, &channels,
			force_channels );
	/*	channels holds the original number of channels, which may have been forced	*/
	if( (force_channels >= 1) && (force_channels <= 4) )
	{
		channels = force_channels;
	}
	if( NULL == img )
	{
		/*	image loading failed	*/
		result_string_pointer = stbi_failure_reason();
		return 0;
	}
	/*	now, does this image have the right dimensions?	*/
	if( (width != 6*height) &&
		(6*width != height) )
	{
		SOIL_free_image_data( img );
		result_string_pointer = "Single cubemap image must have a 6:1 ratio";
		return 0;
	}
	/*	try the image split and create	*/
	tex_id = SOIL_create_OGL_single_cubemap(
			img, width, height, channels,
			face_order, reuse_texture_ID, flags
			);
	/*	nuke the temporary image data and return the texture handle	*/
	SOIL_free_image_data( img );
	return tex_id;
}

unsigned int
	SOIL_create_OGL_single_cubemap
	(
		const unsigned char *const data,
		int width, int height, int channels,
		const char face_order[6],
		unsigned int reuse_texture_ID,
		unsigned int flags
	)
{
	/*	variables	*/
	unsigned char* sub_img;
	int dw, dh, sz, i;
	unsigned int tex_id;
	/*	error checking	*/
	if( data == NULL )
	{
		result_string_pointer = "Invalid single cube map image data";
		return 0;
	}
	/*	face order checking	*/
	for( i = 0; i < 6; ++i )
	{
		if( (face_order[i] != 'N') &&
			(face_order[i] != 'S') &&
			(face_order[i] != 'W') &&
			(face_order[i] != 'E') &&
			(face_order[i] != 'U') &&
			(face_order[i] != 'D') )
		{
			result_string_pointer = "Invalid single cube map face order";
			return 0;
		};
	}
	/*	capability checking	*/
	if( query_cubemap_capability() != SOIL_CAPABILITY_PRESENT )
	{
		result_string_pointer = "No cube map capability present";
		return 0;
	}
	/*	now, does this image have the right dimensions?	*/
	if( (width != 6*height) &&
		(6*width != height) )
	{
		result_string_pointer = "Single cubemap image must have a 6:1 ratio";
		return 0;
	}
	/*	which way am I stepping?	*/
	if( width > height )
	{
		dw = height;
		dh = 0;
	} else
	{
		dw = 0;
		dh = width;
	}
	sz = dw+dh;
	sub_img = (unsigned char *)malloc( sz*sz*channels );
	/*	do the splitting and uploading	*/
	tex_id = reuse_texture_ID;
	for( i = 0; i < 6; ++i )
	{
		int x, y, idx = 0;
		unsigned int cubemap_target = 0;
		/*	copy in the sub-image	*/
		for( y = i*dh; y < i*dh+sz; ++y )
		{
			for( x = i*dw*channels; x < (i*dw+sz)*channels; ++x )
			{
				sub_img[idx++] = data[y*width*channels+x];
			}
		}
		/*	what is my texture target?
			remember, this coordinate system is
			LHS if viewed from inside the cube!	*/
		switch( face_order[i] )
		{
		case 'N':
			cubemap_target = SOIL_TEXTURE_CUBE_MAP_POSITIVE_Z;
			break;
		case 'S':
			cubemap_target = SOIL_TEXTURE_CUBE_MAP_NEGATIVE_Z;
			break;
		case 'W':
			cubemap_target = SOIL_TEXTURE_CUBE_MAP_NEGATIVE_X;
			break;
		case 'E':
			cubemap_target = SOIL_TEXTURE_CUBE_MAP_POSITIVE_X;
			break;
		case 'U':
			cubemap_target = SOIL_TEXTURE_CUBE_MAP_POSITIVE_Y;
			break;
		case 'D':
			cubemap_target = SOIL_TEXTURE_CUBE_MAP_NEGATIVE_Y;
			break;
		}
		/*	upload it as a texture	*/
		tex_id = SOIL_internal_create_OGL_texture(
				sub_img, sz, sz, channels,
				tex_id, flags,
				SOIL_TEXTURE_CUBE_MAP,
				cubemap_target,
				SOIL_MAX_CUBE_MAP_TEXTURE_SIZE );
	}
	/*	and nuke the image and sub-image data	*/
	SOIL_free_image_data( sub_img );
	/*	and return the handle, such as it is	*/
	return tex_id;
}

unsigned int
	SOIL_create_OGL_texture
	(
		const unsigned char *const data,
		int width, int height, int channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	)
{
	/*	wrapper function for 2D textures	*/
	return SOIL_internal_create_OGL_texture(
				data, width, height, channels,
				reuse_texture_ID, flags,
				GL_TEXTURE_2D, GL_TEXTURE_2D,
				GL_MAX_TEXTURE_SIZE );
}

#if SOIL_CHECK_FOR_GL_ERRORS
void check_for_GL_errors( const char *calling_location )
{
	/*	check for errors	*/
	GLenum err_code = glGetError();
	while( GL_NO_ERROR != err_code )
	{
		printf( "OpenGL Error @ %s: %i", calling_location, err_code );
		err_code = glGetError();
	}
}
#else
void check_for_GL_errors( const char *calling_location )
{
	/*	no check for errors	*/
}
#endif

unsigned int
	SOIL_internal_create_OGL_texture
	(
		const unsigned char *const data,
		int width, int height, int channels,
		unsigned int reuse_texture_ID,
		unsigned int flags,
		unsigned int opengl_texture_type,
		unsigned int opengl_texture_target,
		unsigned int texture_check_size_enum
	)
{
	/*	variables	*/
	unsigned char* img;
	unsigned int tex_id;
	unsigned int internal_texture_format = 0, original_texture_format = 0;
	int DXT_mode = SOIL_CAPABILITY_UNKNOWN;
	int max_supported_size;
	/*	If the user wants to use the texture rectangle I kill a few flags	*/
	if( flags & SOIL_FLAG_TEXTURE_RECTANGLE )
	{
		/*	well, the user asked for it, can we do that?	*/
		if( query_tex_rectangle_capability() == SOIL_CAPABILITY_PRESENT )
		{
			/*	only allow this if the user in _NOT_ trying to do a cubemap!	*/
			if( opengl_texture_type == GL_TEXTURE_2D )
			{
				/*	clean out the flags that cannot be used with texture rectangles	*/
				flags &= ~(
						SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS |
						SOIL_FLAG_TEXTURE_REPEATS
					);
				/*	and change my target	*/
				opengl_texture_target = SOIL_TEXTURE_RECTANGLE_ARB;
				opengl_texture_type = SOIL_TEXTURE_RECTANGLE_ARB;
			} else
			{
				/*	not allowed for any other uses (yes, I'm looking at you, cubemaps!)	*/
				flags &= ~SOIL_FLAG_TEXTURE_RECTANGLE;
			}

		} else
		{
			/*	can't do it, and that is a breakable offense (uv coords use pixels instead of [0,1]!)	*/
			result_string_pointer = "Texture Rectangle extension unsupported";
			return 0;
		}
	}
	/*	create a copy the image data	*/
	img = (unsigned char*)malloc( width*height*channels );
	memcpy( img, data, width*height*channels );
	/*	does the user want me to invert the image?	*/
	if( flags & SOIL_FLAG_INVERT_Y )
	{
		int i, j;
		for( j = 0; j*2 < height; ++j )
		{
			int index1 = j * width * channels;
			int index2 = (height - 1 - j) * width * channels;
			for( i = width * channels; i > 0; --i )
			{
				unsigned char temp = img[index1];
				img[index1] = img[index2];
				img[index2] = temp;
				++index1;
				++index2;
			}
		}
	}
	/*	does the user want me to scale the colors into the NTSC safe RGB range?	*/
	if( flags & SOIL_FLAG_NTSC_SAFE_RGB )
	{
		scale_image_RGB_to_NTSC_safe( img, width, height, channels );
	}
	/*	does the user want me to convert from straight to pre-multiplied alpha?
		(and do we even _have_ alpha?)	*/
	if( flags & SOIL_FLAG_MULTIPLY_ALPHA )
	{
		int i;
		switch( channels )
		{
		case 2:
			for( i = 0; i < 2*width*height; i += 2 )
			{
				img[i] = (img[i] * img[i+1] + 128) >> 8;
			}
			break;
		case 4:
			for( i = 0; i < 4*width*height; i += 4 )
			{
				img[i+0] = (img[i+0] * img[i+3] + 128) >> 8;
				img[i+1] = (img[i+1] * img[i+3] + 128) >> 8;
				img[i+2] = (img[i+2] * img[i+3] + 128) >> 8;
			}
			break;
		default:
			/*	no other number of channels contains alpha data	*/
			break;
		}
	}
	/*	if the user can't support NPOT textures, make sure we force the POT option	*/
	if( (query_NPOT_capability() == SOIL_CAPABILITY_NONE) &&
		!(flags & SOIL_FLAG_TEXTURE_RECTANGLE) )
	{
		/*	add in the POT flag */
		flags |= SOIL_FLAG_POWER_OF_TWO;
	}
	/*	how large of a texture can this OpenGL implementation handle?	*/
	/*	texture_check_size_enum will be GL_MAX_TEXTURE_SIZE or SOIL_MAX_CUBE_MAP_TEXTURE_SIZE	*/
	glGetIntegerv( texture_check_size_enum, &max_supported_size );
	/*	do I need to make it a power of 2?	*/
	if(
		(flags & SOIL_FLAG_POWER_OF_TWO) ||	/*	user asked for it	*/
		(flags & SOIL_FLAG_MIPMAPS) ||		/*	need it for the MIP-maps	*/
		(width > max_supported_size) ||		/*	it's too big, (make sure it's	*/
		(height > max_supported_size) )		/*	2^n for later down-sampling)	*/
	{
		int new_width = 1;
		int new_height = 1;
		while( new_width < width )
		{
			new_width *= 2;
		}
		while( new_height < height )
		{
			new_height *= 2;
		}
		/*	still?	*/
		if( (new_width != width) || (new_height != height) )
		{
			/*	yep, resize	*/
			unsigned char *resampled = (unsigned char*)malloc( channels*new_width*new_height );
			up_scale_image(
					img, width, height, channels,
					resampled, new_width, new_height );
			/*	OJO	this is for debug only!	*/
			/*
			SOIL_save_image( "\\showme.bmp", SOIL_SAVE_TYPE_BMP,
							new_width, new_height, channels,
							resampled );
			*/
			/*	nuke the old guy, then point it at the new guy	*/
			SOIL_free_image_data( img );
			img = resampled;
			width = new_width;
			height = new_height;
		}
	}
	/*	now, if it is too large...	*/
	if( (width > max_supported_size) || (height > max_supported_size) )
	{
		/*	I've already made it a power of two, so simply use the MIPmapping
			code to reduce its size to the allowable maximum.	*/
		unsigned char *resampled;
		int reduce_block_x = 1, reduce_block_y = 1;
		int new_width, new_height;
		if( width > max_supported_size )
		{
			reduce_block_x = width / max_supported_size;
		}
		if( height > max_supported_size )
		{
			reduce_block_y = height / max_supported_size;
		}
		new_width = width / reduce_block_x;
		new_height = height / reduce_block_y;
		resampled = (unsigned char*)malloc( channels*new_width*new_height );
		/*	perform the actual reduction	*/
		mipmap_image(	img, width, height, channels,
						resampled, reduce_block_x, reduce_block_y );
		/*	nuke the old guy, then point it at the new guy	*/
		SOIL_free_image_data( img );
		img = resampled;
		width = new_width;
		height = new_height;
	}
	/*	does the user want us to use YCoCg color space?	*/
	if( flags & SOIL_FLAG_CoCg_Y )
	{
		/*	this will only work with RGB and RGBA images */
		convert_RGB_to_YCoCg( img, width, height, channels );
		/*
		save_image_as_DDS( "CoCg_Y.dds", width, height, channels, img );
		*/
	}
	/*	create the OpenGL texture ID handle
    	(note: allowing a forced texture ID lets me reload a texture)	*/
    tex_id = reuse_texture_ID;
    if( tex_id == 0 )
    {
		glGenTextures( 1, &tex_id );
    }
	check_for_GL_errors( "glGenTextures" );
	/* Note: sometimes glGenTextures fails (usually no OpenGL context)	*/
	if( tex_id )
	{
		/*	and what type am I using as the internal texture format?	*/
		switch( channels )
		{
		case 1:
			original_texture_format = GL_LUMINANCE;
			break;
		case 2:
			original_texture_format = GL_LUMINANCE_ALPHA;
			break;
		case 3:
			original_texture_format = GL_RGB;
			break;
		case 4:
			original_texture_format = GL_RGBA;
			break;
		}
		internal_texture_format = original_texture_format;
		/*	does the user want me to, and can I, save as DXT?	*/
		if( flags & SOIL_FLAG_COMPRESS_TO_DXT )
		{
			DXT_mode = query_DXT_capability();
			if( DXT_mode == SOIL_CAPABILITY_PRESENT )
			{
				/*	I can use DXT, whether I compress it or OpenGL does	*/
				if( (channels & 1) == 1 )
				{
					/*	1 or 3 channels = DXT1	*/
					internal_texture_format = SOIL_RGB_S3TC_DXT1;
				} else
				{
					/*	2 or 4 channels = DXT5	*/
					internal_texture_format = SOIL_RGBA_S3TC_DXT5;
				}
			}
		}
		/*  bind an OpenGL texture ID	*/
		glBindTexture( opengl_texture_type, tex_id );
		check_for_GL_errors( "glBindTexture" );
		/*  upload the main image	*/
		if( DXT_mode == SOIL_CAPABILITY_PRESENT )
		{
			/*	user wants me to do the DXT conversion!	*/
			int DDS_size;
			unsigned char *DDS_data = NULL;
			if( (channels & 1) == 1 )
			{
				/*	RGB, use DXT1	*/
				DDS_data = convert_image_to_DXT1( img, width, height, channels, &DDS_size );
			} else
			{
				/*	RGBA, use DXT5	*/
				DDS_data = convert_image_to_DXT5( img, width, height, channels, &DDS_size );
			}
			if( DDS_data )
			{
				soilGlCompressedTexImage2D(
					opengl_texture_target, 0,
					internal_texture_format, width, height, 0,
					DDS_size, DDS_data );
				check_for_GL_errors( "glCompressedTexImage2D" );
				SOIL_free_image_data( DDS_data );
				/*	printf( "Internal DXT compressor\n" );	*/
			} else
			{
				/*	my compression failed, try the OpenGL driver's version	*/
				glTexImage2D(
					opengl_texture_target, 0,
					internal_texture_format, width, height, 0,
					original_texture_format, GL_UNSIGNED_BYTE, img );
				check_for_GL_errors( "glTexImage2D" );
				/*	printf( "OpenGL DXT compressor\n" );	*/
			}
		} else
		{
			/*	user want OpenGL to do all the work!	*/
			glTexImage2D(
				opengl_texture_target, 0,
				internal_texture_format, width, height, 0,
				original_texture_format, GL_UNSIGNED_BYTE, img );
			check_for_GL_errors( "glTexImage2D" );
			/*printf( "OpenGL DXT compressor\n" );	*/
		}
		/*	are any MIPmaps desired?	*/
		if( flags & SOIL_FLAG_MIPMAPS )
		{
			int MIPlevel = 1;
			int MIPwidth = (width+1) / 2;
			int MIPheight = (height+1) / 2;
			unsigned char *resampled = (unsigned char*)malloc( channels*MIPwidth*MIPheight );
			while( ((1<<MIPlevel) <= width) || ((1<<MIPlevel) <= height) )
			{
				/*	do this MIPmap level	*/
				mipmap_image(
						img, width, height, channels,
						resampled,
						(1 << MIPlevel), (1 << MIPlevel) );
				/*  upload the MIPmaps	*/
				if( DXT_mode == SOIL_CAPABILITY_PRESENT )
				{
					/*	user wants me to do the DXT conversion!	*/
					int DDS_size;
					unsigned char *DDS_data = NULL;
					if( (channels & 1) == 1 )
					{
						/*	RGB, use DXT1	*/
						DDS_data = convert_image_to_DXT1(
								resampled, MIPwidth, MIPheight, channels, &DDS_size );
					} else
					{
						/*	RGBA, use DXT5	*/
						DDS_data = convert_image_to_DXT5(
								resampled, MIPwidth, MIPheight, channels, &DDS_size );
					}
					if( DDS_data )
					{
						soilGlCompressedTexImage2D(
							opengl_texture_target, MIPlevel,
							internal_texture_format, MIPwidth, MIPheight, 0,
							DDS_size, DDS_data );
						check_for_GL_errors( "glCompressedTexImage2D" );
						SOIL_free_image_data( DDS_data );
					} else
					{
						/*	my compression failed, try the OpenGL driver's version	*/
						glTexImage2D(
							opengl_texture_target, MIPlevel,
							internal_texture_format, MIPwidth, MIPheight, 0,
							original_texture_format, GL_UNSIGNED_BYTE, resampled );
						check_for_GL_errors( "glTexImage2D" );
					}
				} else
				{
					/*	user want OpenGL to do all the work!	*/
					glTexImage2D(
						opengl_texture_target, MIPlevel,
						internal_texture_format, MIPwidth, MIPheight, 0,
						original_texture_format, GL_UNSIGNED_BYTE, resampled );
					check_for_GL_errors( "glTexImage2D" );
				}
				/*	prep for the next level	*/
				++MIPlevel;
				MIPwidth = (MIPwidth + 1) / 2;
				MIPheight = (MIPheight + 1) / 2;
			}
			SOIL_free_image_data( resampled );
			/*	instruct OpenGL to use the MIPmaps	*/
			glTexParameteri( opengl_texture_type, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
			glTexParameteri( opengl_texture_type, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
			check_for_GL_errors( "GL_TEXTURE_MIN/MAG_FILTER" );
		} else
		{
			/*	instruct OpenGL _NOT_ to use the MIPmaps	*/
			glTexParameteri( opengl_texture_type, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
			glTexParameteri( opengl_texture_type, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
			check_for_GL_errors( "GL_TEXTURE_MIN/MAG_FILTER" );
		}
		/*	does the user want clamping, or wrapping?	*/
		if( flags & SOIL_FLAG_TEXTURE_REPEATS )
		{
			glTexParameteri( opengl_texture_type, GL_TEXTURE_WRAP_S, GL_REPEAT );
			glTexParameteri( opengl_texture_type, GL_TEXTURE_WRAP_T, GL_REPEAT );
			if( opengl_texture_type == SOIL_TEXTURE_CUBE_MAP )
			{
				/*	SOIL_TEXTURE_WRAP_R is invalid if cubemaps aren't supported	*/
				glTexParameteri( opengl_texture_type, SOIL_TEXTURE_WRAP_R, GL_REPEAT );
			}
			check_for_GL_errors( "GL_TEXTURE_WRAP_*" );
		} else
		{
			/*	unsigned int clamp_mode = SOIL_CLAMP_TO_EDGE;	*/
			unsigned int clamp_mode = GL_CLAMP;
			glTexParameteri( opengl_texture_type, GL_TEXTURE_WRAP_S, clamp_mode );
			glTexParameteri( opengl_texture_type, GL_TEXTURE_WRAP_T, clamp_mode );
			if( opengl_texture_type == SOIL_TEXTURE_CUBE_MAP )
			{
				/*	SOIL_TEXTURE_WRAP_R is invalid if cubemaps aren't supported	*/
				glTexParameteri( opengl_texture_type, SOIL_TEXTURE_WRAP_R, clamp_mode );
			}
			check_for_GL_errors( "GL_TEXTURE_WRAP_*" );
		}
		/*	done	*/
		result_string_pointer = "Image loaded as an OpenGL texture";
	} else
	{
		/*	failed	*/
		result_string_pointer = "Failed to generate an OpenGL texture name; missing OpenGL context?";
	}
	SOIL_free_image_data( img );
	return tex_id;
}

int
	SOIL_save_screenshot
	(
		const char *filename,
		int image_type,
		int x, int y,
		int width, int height
	)
{
	unsigned char *pixel_data;
	int i, j;
	int save_result;

	/*	error checks	*/
	if( (width < 1) || (height < 1) )
	{
		result_string_pointer = "Invalid screenshot dimensions";
		return 0;
	}
	if( (x < 0) || (y < 0) )
	{
		result_string_pointer = "Invalid screenshot location";
		return 0;
	}
	if( filename == NULL )
	{
		result_string_pointer = "Invalid screenshot filename";
		return 0;
	}

    /*  Get the data from OpenGL	*/
    pixel_data = (unsigned char*)malloc( 3*width*height );
    glReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, pixel_data);

    /*	invert the image	*/
    for( j = 0; j*2 < height; ++j )
	{
		int index1 = j * width * 3;
		int index2 = (height - 1 - j) * width * 3;
		for( i = width * 3; i > 0; --i )
		{
			unsigned char temp = pixel_data[index1];
			pixel_data[index1] = pixel_data[index2];
			pixel_data[index2] = temp;
			++index1;
			++index2;
		}
	}

    /*	save the image	*/
    save_result = SOIL_save_image( filename, image_type, width, height, 3, pixel_data);

    /*  And free the memory	*/
    SOIL_free_image_data( pixel_data );
	return save_result;
}

unsigned char*
	SOIL_load_image
	(
		const char *filename,
		int *width, int *height, int *channels,
		int force_channels
	)
{
	unsigned char *result = stbi_load( filename,
			width, height, channels, force_channels );
	if( result == NULL )
	{
		result_string_pointer = stbi_failure_reason();
	} else
	{
		result_string_pointer = "Image loaded";
	}
	return result;
}

unsigned char*
	SOIL_load_image_from_memory
	(
		const unsigned char *const buffer,
		int buffer_length,
		int *width, int *height, int *channels,
		int force_channels
	)
{
	unsigned char *result = stbi_load_from_memory(
				buffer, buffer_length,
				width, height, channels,
				force_channels );
	if( result == NULL )
	{
		result_string_pointer = stbi_failure_reason();
	} else
	{
		result_string_pointer = "Image loaded from memory";
	}
	return result;
}

int
	SOIL_save_image
	(
		const char *filename,
		int image_type,
		int width, int height, int channels,
		const unsigned char *const data
	)
{
	int save_result;

	/*	error check	*/
	if( (width < 1) || (height < 1) ||
		(channels < 1) || (channels > 4) ||
		(data == NULL) ||
		(filename == NULL) )
	{
		return 0;
	}
	if( image_type == SOIL_SAVE_TYPE_BMP )
	{
		save_result = stbi_write_bmp( filename,
				width, height, channels, (void*)data );
	} else
	if( image_type == SOIL_SAVE_TYPE_TGA )
	{
		save_result = stbi_write_tga( filename,
				width, height, channels, (void*)data );
	} else
	if( image_type == SOIL_SAVE_TYPE_DDS )
	{
		save_result = save_image_as_DDS( filename,
				width, height, channels, (const unsigned char *const)data );
	} else
	{
		save_result = 0;
	}
	if( save_result == 0 )
	{
		result_string_pointer = "Saving the image failed";
	} else
	{
		result_string_pointer = "Image saved";
	}
	return save_result;
}

void
	SOIL_free_image_data
	(
		unsigned char *img_data
	)
{
	free( (void*)img_data );
}

const char*
	SOIL_last_result
	(
		void
	)
{
	return result_string_pointer;
}

unsigned int SOIL_direct_load_DDS_from_memory(
		const unsigned char *const buffer,
		int buffer_length,
		unsigned int reuse_texture_ID,
		int flags,
		int loading_as_cubemap )
{
	/*	variables	*/
	DDS_header header;
	unsigned int buffer_index = 0;
	unsigned int tex_ID = 0;
	/*	file reading variables	*/
	unsigned int S3TC_type = 0;
	unsigned char *DDS_data;
	unsigned int DDS_main_size;
	unsigned int DDS_full_size;
	unsigned int width, height;
	int mipmaps, cubemap, uncompressed, block_size = 16;
	unsigned int flag;
	unsigned int cf_target, ogl_target_start, ogl_target_end;
	unsigned int opengl_texture_type;
	int i;
	/*	1st off, does the filename even exist?	*/
	if( NULL == buffer )
	{
		/*	we can't do it!	*/
		result_string_pointer = "NULL buffer";
		return 0;
	}
	if( buffer_length < sizeof( DDS_header ) )
	{
		/*	we can't do it!	*/
		result_string_pointer = "DDS file was too small to contain the DDS header";
		return 0;
	}
	/*	try reading in the header	*/
	memcpy ( (void*)(&header), (const void *)buffer, sizeof( DDS_header ) );
	buffer_index = sizeof( DDS_header );
	/*	guilty until proven innocent	*/
	result_string_pointer = "Failed to read a known DDS header";
	/*	validate the header (warning, "goto"'s ahead, shield your eyes!!)	*/
	flag = ('D'<<0)|('D'<<8)|('S'<<16)|(' '<<24);
	if( header.dwMagic != flag ) {goto quick_exit;}
	if( header.dwSize != 124 ) {goto quick_exit;}
	/*	I need all of these	*/
	flag = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT;
	if( (header.dwFlags & flag) != flag ) {goto quick_exit;}
	/*	According to the MSDN spec, the dwFlags should contain
		DDSD_LINEARSIZE if it's compressed, or DDSD_PITCH if
		uncompressed.  Some DDS writers do not conform to the
		spec, so I need to make my reader more tolerant	*/
	/*	I need one of these	*/
	flag = DDPF_FOURCC | DDPF_RGB;
	if( (header.sPixelFormat.dwFlags & flag) == 0 ) {goto quick_exit;}
	if( header.sPixelFormat.dwSize != 32 ) {goto quick_exit;}
	if( (header.sCaps.dwCaps1 & DDSCAPS_TEXTURE) == 0 ) {goto quick_exit;}
	/*	make sure it is a type we can upload	*/
	if( (header.sPixelFormat.dwFlags & DDPF_FOURCC) &&
		!(
		(header.sPixelFormat.dwFourCC == (('D'<<0)|('X'<<8)|('T'<<16)|('1'<<24))) ||
		(header.sPixelFormat.dwFourCC == (('D'<<0)|('X'<<8)|('T'<<16)|('3'<<24))) ||
		(header.sPixelFormat.dwFourCC == (('D'<<0)|('X'<<8)|('T'<<16)|('5'<<24)))
		) )
	{
		goto quick_exit;
	}
	/*	OK, validated the header, let's load the image data	*/
	result_string_pointer = "DDS header loaded and validated";
	width = header.dwWidth;
	height = header.dwHeight;
	uncompressed = 1 - (header.sPixelFormat.dwFlags & DDPF_FOURCC) / DDPF_FOURCC;
	cubemap = (header.sCaps.dwCaps2 & DDSCAPS2_CUBEMAP) / DDSCAPS2_CUBEMAP;
	if( uncompressed )
	{
		S3TC_type = GL_RGB;
		block_size = 3;
		if( header.sPixelFormat.dwFlags & DDPF_ALPHAPIXELS )
		{
			S3TC_type = GL_RGBA;
			block_size = 4;
		}
		DDS_main_size = width * height * block_size;
	} else
	{
		/*	can we even handle direct uploading to OpenGL DXT compressed images?	*/
		if( query_DXT_capability() != SOIL_CAPABILITY_PRESENT )
		{
			/*	we can't do it!	*/
			result_string_pointer = "Direct upload of S3TC images not supported by the OpenGL driver";
			return 0;
		}
		/*	well, we know it is DXT1/3/5, because we checked above	*/
		switch( (header.sPixelFormat.dwFourCC >> 24) - '0' )
		{
		case 1:
			S3TC_type = SOIL_RGBA_S3TC_DXT1;
			block_size = 8;
			break;
		case 3:
			S3TC_type = SOIL_RGBA_S3TC_DXT3;
			block_size = 16;
			break;
		case 5:
			S3TC_type = SOIL_RGBA_S3TC_DXT5;
			block_size = 16;
			break;
		}
		DDS_main_size = ((width+3)>>2)*((height+3)>>2)*block_size;
	}
	if( cubemap )
	{
		/* does the user want a cubemap?	*/
		if( !loading_as_cubemap )
		{
			/*	we can't do it!	*/
			result_string_pointer = "DDS image was a cubemap";
			return 0;
		}
		/*	can we even handle cubemaps with the OpenGL driver?	*/
		if( query_cubemap_capability() != SOIL_CAPABILITY_PRESENT )
		{
			/*	we can't do it!	*/
			result_string_pointer = "Direct upload of cubemap images not supported by the OpenGL driver";
			return 0;
		}
		ogl_target_start = SOIL_TEXTURE_CUBE_MAP_POSITIVE_X;
		ogl_target_end =   SOIL_TEXTURE_CUBE_MAP_NEGATIVE_Z;
		opengl_texture_type = SOIL_TEXTURE_CUBE_MAP;
	} else
	{
		/* does the user want a non-cubemap?	*/
		if( loading_as_cubemap )
		{
			/*	we can't do it!	*/
			result_string_pointer = "DDS image was not a cubemap";
			return 0;
		}
		ogl_target_start = GL_TEXTURE_2D;
		ogl_target_end =   GL_TEXTURE_2D;
		opengl_texture_type = GL_TEXTURE_2D;
	}
	if( (header.sCaps.dwCaps1 & DDSCAPS_MIPMAP) && (header.dwMipMapCount > 1) )
	{
		int shift_offset;
		mipmaps = header.dwMipMapCount - 1;
		DDS_full_size = DDS_main_size;
		if( uncompressed )
		{
			/*	uncompressed DDS, simple MIPmap size calculation	*/
			shift_offset = 0;
		} else
		{
			/*	compressed DDS, MIPmap size calculation is block based	*/
			shift_offset = 2;
		}
		for( i = 1; i <= mipmaps; ++ i )
		{
			int w, h;
			w = width >> (shift_offset + i);
			h = height >> (shift_offset + i);
			if( w < 1 )
			{
				w = 1;
			}
			if( h < 1 )
			{
				h = 1;
			}
			DDS_full_size += w*h*block_size;
		}
	} else
	{
		mipmaps = 0;
		DDS_full_size = DDS_main_size;
	}
	DDS_data = (unsigned char*)malloc( DDS_full_size );
	/*	got the image data RAM, create or use an existing OpenGL texture handle	*/
	tex_ID = reuse_texture_ID;
	if( tex_ID == 0 )
	{
		glGenTextures( 1, &tex_ID );
	}
	/*  bind an OpenGL texture ID	*/
	glBindTexture( opengl_texture_type, tex_ID );
	/*	do this for each face of the cubemap!	*/
	for( cf_target = ogl_target_start; cf_target <= ogl_target_end; ++cf_target )
	{
		if( buffer_index + DDS_full_size <= buffer_length )
		{
			unsigned int byte_offset = DDS_main_size;
			memcpy( (void*)DDS_data, (const void*)(&buffer[buffer_index]), DDS_full_size );
			buffer_index += DDS_full_size;
			/*	upload the main chunk	*/
			if( uncompressed )
			{
				/*	and remember, DXT uncompressed uses BGR(A),
					so swap to RGB(A) for ALL MIPmap levels	*/
				for( i = 0; i < DDS_full_size; i += block_size )
				{
					unsigned char temp = DDS_data[i];
					DDS_data[i] = DDS_data[i+2];
					DDS_data[i+2] = temp;
				}
				glTexImage2D(
					cf_target, 0,
					S3TC_type, width, height, 0,
					S3TC_type, GL_UNSIGNED_BYTE, DDS_data );
			} else
			{
				soilGlCompressedTexImage2D(
					cf_target, 0,
					S3TC_type, width, height, 0,
					DDS_main_size, DDS_data );
			}
			/*	upload the mipmaps, if we have them	*/
			for( i = 1; i <= mipmaps; ++i )
			{
				int w, h, mip_size;
				w = width >> i;
				h = height >> i;
				if( w < 1 )
				{
					w = 1;
				}
				if( h < 1 )
				{
					h = 1;
				}
				/*	upload this mipmap	*/
				if( uncompressed )
				{
					mip_size = w*h*block_size;
					glTexImage2D(
						cf_target, i,
						S3TC_type, w, h, 0,
						S3TC_type, GL_UNSIGNED_BYTE, &DDS_data[byte_offset] );
				} else
				{
					mip_size = ((w+3)/4)*((h+3)/4)*block_size;
					soilGlCompressedTexImage2D(
						cf_target, i,
						S3TC_type, w, h, 0,
						mip_size, &DDS_data[byte_offset] );
				}
				/*	and move to the next mipmap	*/
				byte_offset += mip_size;
			}
			/*	it worked!	*/
			result_string_pointer = "DDS file loaded";
		} else
		{
			glDeleteTextures( 1, & tex_ID );
			tex_ID = 0;
			cf_target = ogl_target_end + 1;
			result_string_pointer = "DDS file was too small for expected image data";
		}
	}/* end reading each face */
	SOIL_free_image_data( DDS_data );
	if( tex_ID )
	{
		/*	did I have MIPmaps?	*/
		if( mipmaps > 0 )
		{
			/*	instruct OpenGL to use the MIPmaps	*/
			glTexParameteri( opengl_texture_type, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
			glTexParameteri( opengl_texture_type, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
		} else
		{
			/*	instruct OpenGL _NOT_ to use the MIPmaps	*/
			glTexParameteri( opengl_texture_type, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
			glTexParameteri( opengl_texture_type, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
		}
		/*	does the user want clamping, or wrapping?	*/
		if( flags & SOIL_FLAG_TEXTURE_REPEATS )
		{
			glTexParameteri( opengl_texture_type, GL_TEXTURE_WRAP_S, GL_REPEAT );
			glTexParameteri( opengl_texture_type, GL_TEXTURE_WRAP_T, GL_REPEAT );
			glTexParameteri( opengl_texture_type, SOIL_TEXTURE_WRAP_R, GL_REPEAT );
		} else
		{
			/*	unsigned int clamp_mode = SOIL_CLAMP_TO_EDGE;	*/
			unsigned int clamp_mode = GL_CLAMP;
			glTexParameteri( opengl_texture_type, GL_TEXTURE_WRAP_S, clamp_mode );
			glTexParameteri( opengl_texture_type, GL_TEXTURE_WRAP_T, clamp_mode );
			glTexParameteri( opengl_texture_type, SOIL_TEXTURE_WRAP_R, clamp_mode );
		}
	}

quick_exit:
	/*	report success or failure	*/
	return tex_ID;
}

unsigned int SOIL_direct_load_DDS(
		const char *filename,
		unsigned int reuse_texture_ID,
		int flags,
		int loading_as_cubemap )
{
	FILE *f;
	unsigned char *buffer;
	size_t buffer_length, bytes_read;
	unsigned int tex_ID = 0;
	/*	error checks	*/
	if( NULL == filename )
	{
		result_string_pointer = "NULL filename";
		return 0;
	}
	f = fopen( filename, "rb" );
	if( NULL == f )
	{
		/*	the file doesn't seem to exist (or be open-able)	*/
		result_string_pointer = "Can not find DDS file";
		return 0;
	}
	fseek( f, 0, SEEK_END );
	buffer_length = ftell( f );
	fseek( f, 0, SEEK_SET );
	buffer = (unsigned char *) malloc( buffer_length );
	if( NULL == buffer )
	{
		result_string_pointer = "malloc failed";
		fclose( f );
		return 0;
	}
	bytes_read = fread( (void*)buffer, 1, buffer_length, f );
	fclose( f );
	if( bytes_read < buffer_length )
	{
		/*	huh?	*/
		buffer_length = bytes_read;
	}
	/*	now try to do the loading	*/
	tex_ID = SOIL_direct_load_DDS_from_memory(
		(const unsigned char *const)buffer, buffer_length,
		reuse_texture_ID, flags, loading_as_cubemap );
	SOIL_free_image_data( buffer );
	return tex_ID;
}

int query_NPOT_capability( void )
{
	/*	check for the capability	*/
	if( has_NPOT_capability == SOIL_CAPABILITY_UNKNOWN )
	{
		/*	we haven't yet checked for the capability, do so	*/
		if(
			(NULL == strstr( (char const*)glGetString( GL_EXTENSIONS ),
				"GL_ARB_texture_non_power_of_two" ) )
			)
		{
			/*	not there, flag the failure	*/
			has_NPOT_capability = SOIL_CAPABILITY_NONE;
		} else
		{
			/*	it's there!	*/
			has_NPOT_capability = SOIL_CAPABILITY_PRESENT;
		}
	}
	/*	let the user know if we can do non-power-of-two textures or not	*/
	return has_NPOT_capability;
}

int query_tex_rectangle_capability( void )
{
	/*	check for the capability	*/
	if( has_tex_rectangle_capability == SOIL_CAPABILITY_UNKNOWN )
	{
		/*	we haven't yet checked for the capability, do so	*/
		if(
			(NULL == strstr( (char const*)glGetString( GL_EXTENSIONS ),
				"GL_ARB_texture_rectangle" ) )
		&&
			(NULL == strstr( (char const*)glGetString( GL_EXTENSIONS ),
				"GL_EXT_texture_rectangle" ) )
		&&
			(NULL == strstr( (char const*)glGetString( GL_EXTENSIONS ),
				"GL_NV_texture_rectangle" ) )
			)
		{
			/*	not there, flag the failure	*/
			has_tex_rectangle_capability = SOIL_CAPABILITY_NONE;
		} else
		{
			/*	it's there!	*/
			has_tex_rectangle_capability = SOIL_CAPABILITY_PRESENT;
		}
	}
	/*	let the user know if we can do texture rectangles or not	*/
	return has_tex_rectangle_capability;
}

int query_cubemap_capability( void )
{
	/*	check for the capability	*/
	if( has_cubemap_capability == SOIL_CAPABILITY_UNKNOWN )
	{
		/*	we haven't yet checked for the capability, do so	*/
		if(
			(NULL == strstr( (char const*)glGetString( GL_EXTENSIONS ),
				"GL_ARB_texture_cube_map" ) )
		&&
			(NULL == strstr( (char const*)glGetString( GL_EXTENSIONS ),
				"GL_EXT_texture_cube_map" ) )
			)
		{
			/*	not there, flag the failure	*/
			has_cubemap_capability = SOIL_CAPABILITY_NONE;
		} else
		{
			/*	it's there!	*/
			has_cubemap_capability = SOIL_CAPABILITY_PRESENT;
		}
	}
	/*	let the user know if we can do cubemaps or not	*/
	return has_cubemap_capability;
}

int query_DXT_capability( void )
{
	/*	check for the capability	*/
	if( has_DXT_capability == SOIL_CAPABILITY_UNKNOWN )
	{
		/*	we haven't yet checked for the capability, do so	*/
		if( NULL == strstr(
				(char const*)glGetString( GL_EXTENSIONS ),
				"GL_EXT_texture_compression_s3tc" ) )
		{
			/*	not there, flag the failure	*/
			has_DXT_capability = SOIL_CAPABILITY_NONE;
		} else
		{
			/*	and find the address of the extension function	*/
			P_SOIL_GLCOMPRESSEDTEXIMAGE2DPROC ext_addr = NULL;
			#ifdef WIN32
				ext_addr = (P_SOIL_GLCOMPRESSEDTEXIMAGE2DPROC)
						wglGetProcAddress
						(
							"glCompressedTexImage2DARB"
						);
			#elif defined(__APPLE__) || defined(__APPLE_CC__)
				/*	I can't test this Apple stuff!	*/
				CFBundleRef bundle;
				CFURLRef bundleURL =
					CFURLCreateWithFileSystemPath(
						kCFAllocatorDefault,
						CFSTR("/System/Library/Frameworks/OpenGL.framework"),
						kCFURLPOSIXPathStyle,
						true );
				CFStringRef extensionName =
					CFStringCreateWithCString(
						kCFAllocatorDefault,
						"glCompressedTexImage2DARB",
						kCFStringEncodingASCII );
				bundle = CFBundleCreate( kCFAllocatorDefault, bundleURL );
				assert( bundle != NULL );
				ext_addr = (P_SOIL_GLCOMPRESSEDTEXIMAGE2DPROC)
						CFBundleGetFunctionPointerForName
						(
							bundle, extensionName
						);
				CFRelease( bundleURL );
				CFRelease( extensionName );
				CFRelease( bundle );
			#else
				ext_addr = (P_SOIL_GLCOMPRESSEDTEXIMAGE2DPROC)
						glXGetProcAddressARB
						(
							(const GLubyte *)"glCompressedTexImage2DARB"
						);
			#endif
			/*	Flag it so no checks needed later	*/
			if( NULL == ext_addr )
			{
				/*	hmm, not good!!  This should not happen, but does on my
					laptop's VIA chipset.  The GL_EXT_texture_compression_s3tc
					spec requires that ARB_texture_compression be present too.
					this means I can upload and have the OpenGL drive do the
					conversion, but I can't use my own routines or load DDS files
					from disk and upload them directly [8^(	*/
				has_DXT_capability = SOIL_CAPABILITY_NONE;
			} else
			{
				/*	all's well!	*/
				soilGlCompressedTexImage2D = ext_addr;
				has_DXT_capability = SOIL_CAPABILITY_PRESENT;
			}
		}
	}
	/*	let the user know if we can do DXT or not	*/
	return has_DXT_capability;
}

Added ext/soil/SOIL.h.







































































































































































































































































































































































































































































































































































































































































































































































































































































































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/**
	@mainpage SOIL

	Jonathan Dummer
	2007-07-26-10.36

	Simple OpenGL Image Library

	A tiny c library for uploading images as
	textures into OpenGL.  Also saving and
	loading of images is supported.

	I'm using Sean's Tool Box image loader as a base:
	http://www.nothings.org/

	I'm upgrading it to load TGA and DDS files, and a direct
	path for loading DDS files straight into OpenGL textures,
	when applicable.

	Image Formats:
	- BMP		load & save
	- TGA		load & save
	- DDS		load & save
	- PNG		load
	- JPG		load

	OpenGL Texture Features:
	- resample to power-of-two sizes
	- MIPmap generation
	- compressed texture S3TC formats (if supported)
	- can pre-multiply alpha for you, for better compositing
	- can flip image about the y-axis (except pre-compressed DDS files)

	Thanks to:
	* Sean Barret - for the awesome stb_image
	* Dan Venkitachalam - for finding some non-compliant DDS files, and patching some explicit casts
	* everybody at gamedev.net
**/

#ifndef HEADER_SIMPLE_OPENGL_IMAGE_LIBRARY
#define HEADER_SIMPLE_OPENGL_IMAGE_LIBRARY

#ifdef __cplusplus
extern "C" {
#endif

/**
	The format of images that may be loaded (force_channels).
	SOIL_LOAD_AUTO leaves the image in whatever format it was found.
	SOIL_LOAD_L forces the image to load as Luminous (greyscale)
	SOIL_LOAD_LA forces the image to load as Luminous with Alpha
	SOIL_LOAD_RGB forces the image to load as Red Green Blue
	SOIL_LOAD_RGBA forces the image to load as Red Green Blue Alpha
**/
enum
{
	SOIL_LOAD_AUTO = 0,
	SOIL_LOAD_L = 1,
	SOIL_LOAD_LA = 2,
	SOIL_LOAD_RGB = 3,
	SOIL_LOAD_RGBA = 4
};

/**
	Passed in as reuse_texture_ID, will cause SOIL to
	register a new texture ID using glGenTextures().
	If the value passed into reuse_texture_ID > 0 then
	SOIL will just re-use that texture ID (great for
	reloading image assets in-game!)
**/
enum
{
	SOIL_CREATE_NEW_ID = 0
};

/**
	flags you can pass into SOIL_load_OGL_texture()
	and SOIL_create_OGL_texture().
	(note that if SOIL_FLAG_DDS_LOAD_DIRECT is used
	the rest of the flags with the exception of
	SOIL_FLAG_TEXTURE_REPEATS will be ignored while
	loading already-compressed DDS files.)

	SOIL_FLAG_POWER_OF_TWO: force the image to be POT
	SOIL_FLAG_MIPMAPS: generate mipmaps for the texture
	SOIL_FLAG_TEXTURE_REPEATS: otherwise will clamp
	SOIL_FLAG_MULTIPLY_ALPHA: for using (GL_ONE,GL_ONE_MINUS_SRC_ALPHA) blending
	SOIL_FLAG_INVERT_Y: flip the image vertically
	SOIL_FLAG_COMPRESS_TO_DXT: if the card can display them, will convert RGB to DXT1, RGBA to DXT5
	SOIL_FLAG_DDS_LOAD_DIRECT: will load DDS files directly without _ANY_ additional processing
	SOIL_FLAG_NTSC_SAFE_RGB: clamps RGB components to the range [16,235]
	SOIL_FLAG_CoCg_Y: Google YCoCg; RGB=>CoYCg, RGBA=>CoCgAY
	SOIL_FLAG_TEXTURE_RECTANGE: uses ARB_texture_rectangle ; pixel indexed & no repeat or MIPmaps or cubemaps
**/
enum
{
	SOIL_FLAG_POWER_OF_TWO = 1,
	SOIL_FLAG_MIPMAPS = 2,
	SOIL_FLAG_TEXTURE_REPEATS = 4,
	SOIL_FLAG_MULTIPLY_ALPHA = 8,
	SOIL_FLAG_INVERT_Y = 16,
	SOIL_FLAG_COMPRESS_TO_DXT = 32,
	SOIL_FLAG_DDS_LOAD_DIRECT = 64,
	SOIL_FLAG_NTSC_SAFE_RGB = 128,
	SOIL_FLAG_CoCg_Y = 256,
	SOIL_FLAG_TEXTURE_RECTANGLE = 512
};

/**
	The types of images that may be saved.
	(TGA supports uncompressed RGB / RGBA)
	(BMP supports uncompressed RGB)
	(DDS supports DXT1 and DXT5)
**/
enum
{
	SOIL_SAVE_TYPE_TGA = 0,
	SOIL_SAVE_TYPE_BMP = 1,
	SOIL_SAVE_TYPE_DDS = 2
};

/**
	Defines the order of faces in a DDS cubemap.
	I recommend that you use the same order in single
	image cubemap files, so they will be interchangeable
	with DDS cubemaps when using SOIL.
**/
#define SOIL_DDS_CUBEMAP_FACE_ORDER "EWUDNS"

/**
	The types of internal fake HDR representations

	SOIL_HDR_RGBE:		RGB * pow( 2.0, A - 128.0 )
	SOIL_HDR_RGBdivA:	RGB / A
	SOIL_HDR_RGBdivA2:	RGB / (A*A)
**/
enum
{
	SOIL_HDR_RGBE = 0,
	SOIL_HDR_RGBdivA = 1,
	SOIL_HDR_RGBdivA2 = 2
};

/**
	Loads an image from disk into an OpenGL texture.
	\param filename the name of the file to upload as a texture
	\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
	\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
	\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
	\return 0-failed, otherwise returns the OpenGL texture handle
**/
unsigned int
	SOIL_load_OGL_texture
	(
		const char *filename,
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	);

/**
	Loads 6 images from disk into an OpenGL cubemap texture.
	\param x_pos_file the name of the file to upload as the +x cube face
	\param x_neg_file the name of the file to upload as the -x cube face
	\param y_pos_file the name of the file to upload as the +y cube face
	\param y_neg_file the name of the file to upload as the -y cube face
	\param z_pos_file the name of the file to upload as the +z cube face
	\param z_neg_file the name of the file to upload as the -z cube face
	\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
	\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
	\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
	\return 0-failed, otherwise returns the OpenGL texture handle
**/
unsigned int
	SOIL_load_OGL_cubemap
	(
		const char *x_pos_file,
		const char *x_neg_file,
		const char *y_pos_file,
		const char *y_neg_file,
		const char *z_pos_file,
		const char *z_neg_file,
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	);

/**
	Loads 1 image from disk and splits it into an OpenGL cubemap texture.
	\param filename the name of the file to upload as a texture
	\param face_order the order of the faces in the file, any combination of NSWEUD, for North, South, Up, etc.
	\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
	\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
	\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
	\return 0-failed, otherwise returns the OpenGL texture handle
**/
unsigned int
	SOIL_load_OGL_single_cubemap
	(
		const char *filename,
		const char face_order[6],
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	);

/**
	Loads an HDR image from disk into an OpenGL texture.
	\param filename the name of the file to upload as a texture
	\param fake_HDR_format SOIL_HDR_RGBE, SOIL_HDR_RGBdivA, SOIL_HDR_RGBdivA2
	\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
	\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT
	\return 0-failed, otherwise returns the OpenGL texture handle
**/
unsigned int
	SOIL_load_OGL_HDR_texture
	(
		const char *filename,
		int fake_HDR_format,
		int rescale_to_max,
		unsigned int reuse_texture_ID,
		unsigned int flags
	);

/**
	Loads an image from RAM into an OpenGL texture.
	\param buffer the image data in RAM just as if it were still in a file
	\param buffer_length the size of the buffer in bytes
	\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
	\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
	\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
	\return 0-failed, otherwise returns the OpenGL texture handle
**/
unsigned int
	SOIL_load_OGL_texture_from_memory
	(
		const unsigned char *const buffer,
		int buffer_length,
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags,
		/* ADDED */
		int* rw, int* rh
	);

/**
	Loads 6 images from memory into an OpenGL cubemap texture.
	\param x_pos_buffer the image data in RAM to upload as the +x cube face
	\param x_pos_buffer_length the size of the above buffer
	\param x_neg_buffer the image data in RAM to upload as the +x cube face
	\param x_neg_buffer_length the size of the above buffer
	\param y_pos_buffer the image data in RAM to upload as the +x cube face
	\param y_pos_buffer_length the size of the above buffer
	\param y_neg_buffer the image data in RAM to upload as the +x cube face
	\param y_neg_buffer_length the size of the above buffer
	\param z_pos_buffer the image data in RAM to upload as the +x cube face
	\param z_pos_buffer_length the size of the above buffer
	\param z_neg_buffer the image data in RAM to upload as the +x cube face
	\param z_neg_buffer_length the size of the above buffer
	\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
	\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
	\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
	\return 0-failed, otherwise returns the OpenGL texture handle
**/
unsigned int
	SOIL_load_OGL_cubemap_from_memory
	(
		const unsigned char *const x_pos_buffer,
		int x_pos_buffer_length,
		const unsigned char *const x_neg_buffer,
		int x_neg_buffer_length,
		const unsigned char *const y_pos_buffer,
		int y_pos_buffer_length,
		const unsigned char *const y_neg_buffer,
		int y_neg_buffer_length,
		const unsigned char *const z_pos_buffer,
		int z_pos_buffer_length,
		const unsigned char *const z_neg_buffer,
		int z_neg_buffer_length,
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	);

/**
	Loads 1 image from RAM and splits it into an OpenGL cubemap texture.
	\param buffer the image data in RAM just as if it were still in a file
	\param buffer_length the size of the buffer in bytes
	\param face_order the order of the faces in the file, any combination of NSWEUD, for North, South, Up, etc.
	\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
	\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
	\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
	\return 0-failed, otherwise returns the OpenGL texture handle
**/
unsigned int
	SOIL_load_OGL_single_cubemap_from_memory
	(
		const unsigned char *const buffer,
		int buffer_length,
		const char face_order[6],
		int force_channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	);

/**
	Creates a 2D OpenGL texture from raw image data.  Note that the raw data is
	_NOT_ freed after the upload (so the user can load various versions).
	\param data the raw data to be uploaded as an OpenGL texture
	\param width the width of the image in pixels
	\param height the height of the image in pixels
	\param channels the number of channels: 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
	\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
	\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT
	\return 0-failed, otherwise returns the OpenGL texture handle
**/
unsigned int
	SOIL_create_OGL_texture
	(
		const unsigned char *const data,
		int width, int height, int channels,
		unsigned int reuse_texture_ID,
		unsigned int flags
	);

/**
	Creates an OpenGL cubemap texture by splitting up 1 image into 6 parts.
	\param data the raw data to be uploaded as an OpenGL texture
	\param width the width of the image in pixels
	\param height the height of the image in pixels
	\param channels the number of channels: 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
	\param face_order the order of the faces in the file, and combination of NSWEUD, for North, South, Up, etc.
	\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
	\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
	\return 0-failed, otherwise returns the OpenGL texture handle
**/
unsigned int
	SOIL_create_OGL_single_cubemap
	(
		const unsigned char *const data,
		int width, int height, int channels,
		const char face_order[6],
		unsigned int reuse_texture_ID,
		unsigned int flags
	);

/**
	Captures the OpenGL window (RGB) and saves it to disk
	\return 0 if it failed, otherwise returns 1
**/
int
	SOIL_save_screenshot
	(
		const char *filename,
		int image_type,
		int x, int y,
		int width, int height
	);

/**
	Loads an image from disk into an array of unsigned chars.
	Note that *channels return the original channel count of the
	image.  If force_channels was other than SOIL_LOAD_AUTO,
	the resulting image has force_channels, but *channels may be
	different (if the original image had a different channel
	count).
	\return 0 if failed, otherwise returns 1
**/
unsigned char*
	SOIL_load_image
	(
		const char *filename,
		int *width, int *height, int *channels,
		int force_channels
	);

/**
	Loads an image from memory into an array of unsigned chars.
	Note that *channels return the original channel count of the
	image.  If force_channels was other than SOIL_LOAD_AUTO,
	the resulting image has force_channels, but *channels may be
	different (if the original image had a different channel
	count).
	\return 0 if failed, otherwise returns 1
**/
unsigned char*
	SOIL_load_image_from_memory
	(
		const unsigned char *const buffer,
		int buffer_length,
		int *width, int *height, int *channels,
		int force_channels
	);

/**
	Saves an image from an array of unsigned chars (RGBA) to disk
	\return 0 if failed, otherwise returns 1
**/
int
	SOIL_save_image
	(
		const char *filename,
		int image_type,
		int width, int height, int channels,
		const unsigned char *const data
	);

/**
	Frees the image data (note, this is just C's "free()"...this function is
	present mostly so C++ programmers don't forget to use "free()" and call
	"delete []" instead [8^)
**/
void
	SOIL_free_image_data
	(
		unsigned char *img_data
	);

/**
	This function resturn a pointer to a string describing the last thing
	that happened inside SOIL.  It can be used to determine why an image
	failed to load.
**/
const char*
	SOIL_last_result
	(
		void
	);


#ifdef __cplusplus
}
#endif

#endif /* HEADER_SIMPLE_OPENGL_IMAGE_LIBRARY	*/

Added ext/soil/image_DXT.c.

















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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/*
	Jonathan Dummer
	2007-07-31-10.32

	simple DXT compression / decompression code

	public domain
*/

#include "image_DXT.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

/*	set this =1 if you want to use the covarince matrix method...
	which is better than my method of using standard deviations
	overall, except on the infintesimal chance that the power
	method fails for finding the largest eigenvector	*/
#define USE_COV_MAT	1

/********* Function Prototypes *********/
/*
	Takes a 4x4 block of pixels and compresses it into 8 bytes
	in DXT1 format (color only, no alpha).  Speed is valued
	over prettyness, at least for now.
*/
void compress_DDS_color_block(
				int channels,
				const unsigned char *const uncompressed,
				unsigned char compressed[8] );
/*
	Takes a 4x4 block of pixels and compresses the alpha
	component it into 8 bytes for use in DXT5 DDS files.
	Speed is valued over prettyness, at least for now.
*/
void compress_DDS_alpha_block(
				const unsigned char *const uncompressed,
				unsigned char compressed[8] );

/********* Actual Exposed Functions *********/
int
	save_image_as_DDS
	(
		const char *filename,
		int width, int height, int channels,
		const unsigned char *const data
	)
{
	/*	variables	*/
	FILE *fout;
	unsigned char *DDS_data;
	DDS_header header;
	int DDS_size;
	/*	error check	*/
	if( (NULL == filename) ||
		(width < 1) || (height < 1) ||
		(channels < 1) || (channels > 4) ||
		(data == NULL ) )
	{
		return 0;
	}
	/*	Convert the image	*/
	if( (channels & 1) == 1 )
	{
		/*	no alpha, just use DXT1	*/
		DDS_data = convert_image_to_DXT1( data, width, height, channels, &DDS_size );
	} else
	{
		/*	has alpha, so use DXT5	*/
		DDS_data = convert_image_to_DXT5( data, width, height, channels, &DDS_size );
	}
	/*	save it	*/
	memset( &header, 0, sizeof( DDS_header ) );
	header.dwMagic = ('D' << 0) | ('D' << 8) | ('S' << 16) | (' ' << 24);
	header.dwSize = 124;
	header.dwFlags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT | DDSD_LINEARSIZE;
	header.dwWidth = width;
	header.dwHeight = height;
	header.dwPitchOrLinearSize = DDS_size;
	header.sPixelFormat.dwSize = 32;
	header.sPixelFormat.dwFlags = DDPF_FOURCC;
	if( (channels & 1) == 1 )
	{
		header.sPixelFormat.dwFourCC = ('D' << 0) | ('X' << 8) | ('T' << 16) | ('1' << 24);
	} else
	{
		header.sPixelFormat.dwFourCC = ('D' << 0) | ('X' << 8) | ('T' << 16) | ('5' << 24);
	}
	header.sCaps.dwCaps1 = DDSCAPS_TEXTURE;
	/*	write it out	*/
	fout = fopen( filename, "wb");
	fwrite( &header, sizeof( DDS_header ), 1, fout );
	fwrite( DDS_data, 1, DDS_size, fout );
	fclose( fout );
	/*	done	*/
	free( DDS_data );
	return 1;
}

unsigned char* convert_image_to_DXT1(
		const unsigned char *const uncompressed,
		int width, int height, int channels,
		int *out_size )
{
	unsigned char *compressed;
	int i, j, x, y;
	unsigned char ublock[16*3];
	unsigned char cblock[8];
	int index = 0, chan_step = 1;
	int block_count = 0;
	/*	error check	*/
	*out_size = 0;
	if( (width < 1) || (height < 1) ||
		(NULL == uncompressed) ||
		(channels < 1) || (channels > 4) )
	{
		return NULL;
	}
	/*	for channels == 1 or 2, I do not step forward for R,G,B values	*/
	if( channels < 3 )
	{
		chan_step = 0;
	}
	/*	get the RAM for the compressed image
		(8 bytes per 4x4 pixel block)	*/
	*out_size = ((width+3) >> 2) * ((height+3) >> 2) * 8;
	compressed = (unsigned char*)malloc( *out_size );
	/*	go through each block	*/
	for( j = 0; j < height; j += 4 )
	{
		for( i = 0; i < width; i += 4 )
		{
			/*	copy this block into a new one	*/
			int idx = 0;
			int mx = 4, my = 4;
			if( j+4 >= height )
			{
				my = height - j;
			}
			if( i+4 >= width )
			{
				mx = width - i;
			}
			for( y = 0; y < my; ++y )
			{
				for( x = 0; x < mx; ++x )
				{
					ublock[idx++] = uncompressed[(j+y)*width*channels+(i+x)*channels];
					ublock[idx++] = uncompressed[(j+y)*width*channels+(i+x)*channels+chan_step];
					ublock[idx++] = uncompressed[(j+y)*width*channels+(i+x)*channels+chan_step+chan_step];
				}
				for( x = mx; x < 4; ++x )
				{
					ublock[idx++] = ublock[0];
					ublock[idx++] = ublock[1];
					ublock[idx++] = ublock[2];
				}
			}
			for( y = my; y < 4; ++y )
			{
				for( x = 0; x < 4; ++x )
				{
					ublock[idx++] = ublock[0];
					ublock[idx++] = ublock[1];
					ublock[idx++] = ublock[2];
				}
			}
			/*	compress the block	*/
			++block_count;
			compress_DDS_color_block( 3, ublock, cblock );
			/*	copy the data from the block into the main block	*/
			for( x = 0; x < 8; ++x )
			{
				compressed[index++] = cblock[x];
			}
		}
	}
	return compressed;
}

unsigned char* convert_image_to_DXT5(
		const unsigned char *const uncompressed,
		int width, int height, int channels,
		int *out_size )
{
	unsigned char *compressed;
	int i, j, x, y;
	unsigned char ublock[16*4];
	unsigned char cblock[8];
	int index = 0, chan_step = 1;
	int block_count = 0, has_alpha;
	/*	error check	*/
	*out_size = 0;
	if( (width < 1) || (height < 1) ||
		(NULL == uncompressed) ||
		(channels < 1) || ( channels > 4) )
	{
		return NULL;
	}
	/*	for channels == 1 or 2, I do not step forward for R,G,B vales	*/
	if( channels < 3 )
	{
		chan_step = 0;
	}
	/*	# channels = 1 or 3 have no alpha, 2 & 4 do have alpha	*/
	has_alpha = 1 - (channels & 1);
	/*	get the RAM for the compressed image
		(16 bytes per 4x4 pixel block)	*/
	*out_size = ((width+3) >> 2) * ((height+3) >> 2) * 16;
	compressed = (unsigned char*)malloc( *out_size );
	/*	go through each block	*/
	for( j = 0; j < height; j += 4 )
	{
		for( i = 0; i < width; i += 4 )
		{
			/*	local variables, and my block counter	*/
			int idx = 0;
			int mx = 4, my = 4;
			if( j+4 >= height )
			{
				my = height - j;
			}
			if( i+4 >= width )
			{
				mx = width - i;
			}
			for( y = 0; y < my; ++y )
			{
				for( x = 0; x < mx; ++x )
				{
					ublock[idx++] = uncompressed[(j+y)*width*channels+(i+x)*channels];
					ublock[idx++] = uncompressed[(j+y)*width*channels+(i+x)*channels+chan_step];
					ublock[idx++] = uncompressed[(j+y)*width*channels+(i+x)*channels+chan_step+chan_step];
					ublock[idx++] =
						has_alpha * uncompressed[(j+y)*width*channels+(i+x)*channels+channels-1]
						+ (1-has_alpha)*255;
				}
				for( x = mx; x < 4; ++x )
				{
					ublock[idx++] = ublock[0];
					ublock[idx++] = ublock[1];
					ublock[idx++] = ublock[2];
					ublock[idx++] = ublock[3];
				}
			}
			for( y = my; y < 4; ++y )
			{
				for( x = 0; x < 4; ++x )
				{
					ublock[idx++] = ublock[0];
					ublock[idx++] = ublock[1];
					ublock[idx++] = ublock[2];
					ublock[idx++] = ublock[3];
				}
			}
			/*	now compress the alpha block	*/
			compress_DDS_alpha_block( ublock, cblock );
			/*	copy the data from the compressed alpha block into the main buffer	*/
			for( x = 0; x < 8; ++x )
			{
				compressed[index++] = cblock[x];
			}
			/*	then compress the color block	*/
			++block_count;
			compress_DDS_color_block( 4, ublock, cblock );
			/*	copy the data from the compressed color block into the main buffer	*/
			for( x = 0; x < 8; ++x )
			{
				compressed[index++] = cblock[x];
			}
		}
	}
	return compressed;
}

/********* Helper Functions *********/
int convert_bit_range( int c, int from_bits, int to_bits )
{
	int b = (1 << (from_bits - 1)) + c * ((1 << to_bits) - 1);
	return (b + (b >> from_bits)) >> from_bits;
}

int rgb_to_565( int r, int g, int b )
{
	return
		(convert_bit_range( r, 8, 5 ) << 11) |
		(convert_bit_range( g, 8, 6 ) << 05) |
		(convert_bit_range( b, 8, 5 ) << 00);
}

void rgb_888_from_565( unsigned int c, int *r, int *g, int *b )
{
	*r = convert_bit_range( (c >> 11) & 31, 5, 8 );
	*g = convert_bit_range( (c >> 05) & 63, 6, 8 );
	*b = convert_bit_range( (c >> 00) & 31, 5, 8 );
}

void compute_color_line_STDEV(
		const unsigned char *const uncompressed,
		int channels,
		float point[3], float direction[3] )
{
	const float inv_16 = 1.0f / 16.0f;
	int i;
	float sum_r = 0.0f, sum_g = 0.0f, sum_b = 0.0f;
	float sum_rr = 0.0f, sum_gg = 0.0f, sum_bb = 0.0f;
	float sum_rg = 0.0f, sum_rb = 0.0f, sum_gb = 0.0f;
	/*	calculate all data needed for the covariance matrix
		( to compare with _rygdxt code)	*/
	for( i = 0; i < 16*channels; i += channels )
	{
		sum_r += uncompressed[i+0];
		sum_rr += uncompressed[i+0] * uncompressed[i+0];
		sum_g += uncompressed[i+1];
		sum_gg += uncompressed[i+1] * uncompressed[i+1];
		sum_b += uncompressed[i+2];
		sum_bb += uncompressed[i+2] * uncompressed[i+2];
		sum_rg += uncompressed[i+0] * uncompressed[i+1];
		sum_rb += uncompressed[i+0] * uncompressed[i+2];
		sum_gb += uncompressed[i+1] * uncompressed[i+2];
	}
	/*	convert the sums to averages	*/
	sum_r *= inv_16;
	sum_g *= inv_16;
	sum_b *= inv_16;
	/*	and convert the squares to the squares of the value - avg_value	*/
	sum_rr -= 16.0f * sum_r * sum_r;
	sum_gg -= 16.0f * sum_g * sum_g;
	sum_bb -= 16.0f * sum_b * sum_b;
	sum_rg -= 16.0f * sum_r * sum_g;
	sum_rb -= 16.0f * sum_r * sum_b;
	sum_gb -= 16.0f * sum_g * sum_b;
	/*	the point on the color line is the average	*/
	point[0] = sum_r;
	point[1] = sum_g;
	point[2] = sum_b;
	#if USE_COV_MAT
	/*
		The following idea was from ryg.
		(https://mollyrocket.com/forums/viewtopic.php?t=392)
		The method worked great (less RMSE than mine) most of
		the time, but had some issues handling some simple
		boundary cases, like full green next to full red,
		which would generate a covariance matrix like this:

		| 1  -1  0 |
		| -1  1  0 |
		| 0   0  0 |

		For a given starting vector, the power method can
		generate all zeros!  So no starting with {1,1,1}
		as I was doing!  This kind of error is still a
		slight posibillity, but will be very rare.
	*/
	/*	use the covariance matrix directly
		(1st iteration, don't use all 1.0 values!)	*/
	sum_r = 1.0f;
	sum_g = 2.718281828f;
	sum_b = 3.141592654f;
	direction[0] = sum_r*sum_rr + sum_g*sum_rg + sum_b*sum_rb;
	direction[1] = sum_r*sum_rg + sum_g*sum_gg + sum_b*sum_gb;
	direction[2] = sum_r*sum_rb + sum_g*sum_gb + sum_b*sum_bb;
	/*	2nd iteration, use results from the 1st guy	*/
	sum_r = direction[0];
	sum_g = direction[1];
	sum_b = direction[2];
	direction[0] = sum_r*sum_rr + sum_g*sum_rg + sum_b*sum_rb;
	direction[1] = sum_r*sum_rg + sum_g*sum_gg + sum_b*sum_gb;
	direction[2] = sum_r*sum_rb + sum_g*sum_gb + sum_b*sum_bb;
	/*	3rd iteration, use results from the 2nd guy	*/
	sum_r = direction[0];
	sum_g = direction[1];
	sum_b = direction[2];
	direction[0] = sum_r*sum_rr + sum_g*sum_rg + sum_b*sum_rb;
	direction[1] = sum_r*sum_rg + sum_g*sum_gg + sum_b*sum_gb;
	direction[2] = sum_r*sum_rb + sum_g*sum_gb + sum_b*sum_bb;
	#else
	/*	use my standard deviation method
		(very robust, a tiny bit slower and less accurate)	*/
	direction[0] = sqrt( sum_rr );
	direction[1] = sqrt( sum_gg );
	direction[2] = sqrt( sum_bb );
	/*	which has a greater component	*/
	if( sum_gg > sum_rr )
	{
		/*	green has greater component, so base the other signs off of green	*/
		if( sum_rg < 0.0f )
		{
			direction[0] = -direction[0];
		}
		if( sum_gb < 0.0f )
		{
			direction[2] = -direction[2];
		}
	} else
	{
		/*	red has a greater component	*/
		if( sum_rg < 0.0f )
		{
			direction[1] = -direction[1];
		}
		if( sum_rb < 0.0f )
		{
			direction[2] = -direction[2];
		}
	}
	#endif
}

void LSE_master_colors_max_min(
		int *cmax, int *cmin,
		int channels,
		const unsigned char *const uncompressed )
{
	int i, j;
	/*	the master colors	*/
	int c0[3], c1[3];
	/*	used for fitting the line	*/
	float sum_x[] = { 0.0f, 0.0f, 0.0f };
	float sum_x2[] = { 0.0f, 0.0f, 0.0f };
	float dot_max = 1.0f, dot_min = -1.0f;
	float vec_len2 = 0.0f;
	float dot;
	/*	error check	*/
	if( (channels < 3) || (channels > 4) )
	{
		return;
	}
	compute_color_line_STDEV( uncompressed, channels, sum_x, sum_x2 );
	vec_len2 = 1.0f / ( 0.00001f +
			sum_x2[0]*sum_x2[0] + sum_x2[1]*sum_x2[1] + sum_x2[2]*sum_x2[2] );
	/*	finding the max and min vector values	*/
	dot_max =
			(
				sum_x2[0] * uncompressed[0] +
				sum_x2[1] * uncompressed[1] +
				sum_x2[2] * uncompressed[2]
			);
	dot_min = dot_max;
	for( i = 1; i < 16; ++i )
	{
		dot =
			(
				sum_x2[0] * uncompressed[i*channels+0] +
				sum_x2[1] * uncompressed[i*channels+1] +
				sum_x2[2] * uncompressed[i*channels+2]
			);
		if( dot < dot_min )
		{
			dot_min = dot;
		} else if( dot > dot_max )
		{
			dot_max = dot;
		}
	}
	/*	and the offset (from the average location)	*/
	dot = sum_x2[0]*sum_x[0] + sum_x2[1]*sum_x[1] + sum_x2[2]*sum_x[2];
	dot_min -= dot;
	dot_max -= dot;
	/*	post multiply by the scaling factor	*/
	dot_min *= vec_len2;
	dot_max *= vec_len2;
	/*	OK, build the master colors	*/
	for( i = 0; i < 3; ++i )
	{
		/*	color 0	*/
		c0[i] = (int)(0.5f + sum_x[i] + dot_max * sum_x2[i]);
		if( c0[i] < 0 )
		{
			c0[i] = 0;
		} else if( c0[i] > 255 )
		{
			c0[i] = 255;
		}
		/*	color 1	*/
		c1[i] = (int)(0.5f + sum_x[i] + dot_min * sum_x2[i]);
		if( c1[i] < 0 )
		{
			c1[i] = 0;
		} else if( c1[i] > 255 )
		{
			c1[i] = 255;
		}
	}
	/*	down_sample (with rounding?)	*/
	i = rgb_to_565( c0[0], c0[1], c0[2] );
	j = rgb_to_565( c1[0], c1[1], c1[2] );
	if( i > j )
	{
		*cmax = i;
		*cmin = j;
	} else
	{
		*cmax = j;
		*cmin = i;
	}
}

void
	compress_DDS_color_block
	(
		int channels,
		const unsigned char *const uncompressed,
		unsigned char compressed[8]
	)
{
	/*	variables	*/
	int i;
	int next_bit;
	int enc_c0, enc_c1;
	int c0[4], c1[4];
	float color_line[] = { 0.0f, 0.0f, 0.0f, 0.0f };
	float vec_len2 = 0.0f, dot_offset = 0.0f;
	/*	stupid order	*/
	int swizzle4[] = { 0, 2, 3, 1 };
	/*	get the master colors	*/
	LSE_master_colors_max_min( &enc_c0, &enc_c1, channels, uncompressed );
	/*	store the 565 color 0 and color 1	*/
	compressed[0] = (enc_c0 >> 0) & 255;
	compressed[1] = (enc_c0 >> 8) & 255;
	compressed[2] = (enc_c1 >> 0) & 255;
	compressed[3] = (enc_c1 >> 8) & 255;
	/*	zero out the compressed data	*/
	compressed[4] = 0;
	compressed[5] = 0;
	compressed[6] = 0;
	compressed[7] = 0;
	/*	reconstitute the master color vectors	*/
	rgb_888_from_565( enc_c0, &c0[0], &c0[1], &c0[2] );
	rgb_888_from_565( enc_c1, &c1[0], &c1[1], &c1[2] );
	/*	the new vector	*/
	vec_len2 = 0.0f;
	for( i = 0; i < 3; ++i )
	{
		color_line[i] = (float)(c1[i] - c0[i]);
		vec_len2 += color_line[i] * color_line[i];
	}
	if( vec_len2 > 0.0f )
	{
		vec_len2 = 1.0f / vec_len2;
	}
	/*	pre-proform the scaling	*/
	color_line[0] *= vec_len2;
	color_line[1] *= vec_len2;
	color_line[2] *= vec_len2;
	/*	compute the offset (constant) portion of the dot product	*/
	dot_offset = color_line[0]*c0[0] + color_line[1]*c0[1] + color_line[2]*c0[2];
	/*	store the rest of the bits	*/
	next_bit = 8*4;
	for( i = 0; i < 16; ++i )
	{
		/*	find the dot product of this color, to place it on the line
			(should be [-1,1])	*/
		int next_value = 0;
		float dot_product =
			color_line[0] * uncompressed[i*channels+0] +
			color_line[1] * uncompressed[i*channels+1] +
			color_line[2] * uncompressed[i*channels+2] -
			dot_offset;
		/*	map to [0,3]	*/
		next_value = (int)( dot_product * 3.0f + 0.5f );
		if( next_value > 3 )
		{
			next_value = 3;
		} else if( next_value < 0 )
		{
			next_value = 0;
		}
		/*	OK, store this value	*/
		compressed[next_bit >> 3] |= swizzle4[ next_value ] << (next_bit & 7);
		next_bit += 2;
	}
	/*	done compressing to DXT1	*/
}

void
	compress_DDS_alpha_block
	(
		const unsigned char *const uncompressed,
		unsigned char compressed[8]
	)
{
	/*	variables	*/
	int i;
	int next_bit;
	int a0, a1;
	float scale_me;
	/*	stupid order	*/
	int swizzle8[] = { 1, 7, 6, 5, 4, 3, 2, 0 };
	/*	get the alpha limits (a0 > a1)	*/
	a0 = a1 = uncompressed[3];
	for( i = 4+3; i < 16*4; i += 4 )
	{
		if( uncompressed[i] > a0 )
		{
			a0 = uncompressed[i];
		} else if( uncompressed[i] < a1 )
		{
			a1 = uncompressed[i];
		}
	}
	/*	store those limits, and zero the rest of the compressed dataset	*/
	compressed[0] = a0;
	compressed[1] = a1;
	/*	zero out the compressed data	*/
	compressed[2] = 0;
	compressed[3] = 0;
	compressed[4] = 0;
	compressed[5] = 0;
	compressed[6] = 0;
	compressed[7] = 0;
	/*	store the all of the alpha values	*/
	next_bit = 8*2;
	scale_me = 7.9999f / (a0 - a1);
	for( i = 3; i < 16*4; i += 4 )
	{
		/*	convert this alpha value to a 3 bit number	*/
		int svalue;
		int value = (int)((uncompressed[i] - a1) * scale_me);
		svalue = swizzle8[ value&7 ];
		/*	OK, store this value, start with the 1st byte	*/
		compressed[next_bit >> 3] |= svalue << (next_bit & 7);
		if( (next_bit & 7) > 5 )
		{
			/*	spans 2 bytes, fill in the start of the 2nd byte	*/
			compressed[1 + (next_bit >> 3)] |= svalue >> (8 - (next_bit & 7) );
		}
		next_bit += 3;
	}
	/*	done compressing to DXT1	*/
}

Added ext/soil/image_DXT.h.























































































































































































































































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/*
	Jonathan Dummer
	2007-07-31-10.32

	simple DXT compression / decompression code

	public domain
*/

#ifndef HEADER_IMAGE_DXT
#define HEADER_IMAGE_DXT

/**
	Converts an image from an array of unsigned chars (RGB or RGBA) to
	DXT1 or DXT5, then saves the converted image to disk.
	\return 0 if failed, otherwise returns 1
**/
int
save_image_as_DDS
(
    const char *filename,
    int width, int height, int channels,
    const unsigned char *const data
);

/**
	take an image and convert it to DXT1 (no alpha)
**/
unsigned char*
convert_image_to_DXT1
(
    const unsigned char *const uncompressed,
    int width, int height, int channels,
    int *out_size
);

/**
	take an image and convert it to DXT5 (with alpha)
**/
unsigned char*
convert_image_to_DXT5
(
    const unsigned char *const uncompressed,
    int width, int height, int channels,
    int *out_size
);

/**	A bunch of DirectDraw Surface structures and flags **/
typedef struct
{
    unsigned int    dwMagic;
    unsigned int    dwSize;
    unsigned int    dwFlags;
    unsigned int    dwHeight;
    unsigned int    dwWidth;
    unsigned int    dwPitchOrLinearSize;
    unsigned int    dwDepth;
    unsigned int    dwMipMapCount;
    unsigned int    dwReserved1[ 11 ];

    /*  DDPIXELFORMAT	*/
    struct
    {
        unsigned int    dwSize;
        unsigned int    dwFlags;
        unsigned int    dwFourCC;
        unsigned int    dwRGBBitCount;
        unsigned int    dwRBitMask;
        unsigned int    dwGBitMask;
        unsigned int    dwBBitMask;
        unsigned int    dwAlphaBitMask;
    }
    sPixelFormat;

    /*  DDCAPS2	*/
    struct
    {
        unsigned int    dwCaps1;
        unsigned int    dwCaps2;
        unsigned int    dwDDSX;
        unsigned int    dwReserved;
    }
    sCaps;
    unsigned int    dwReserved2;
}
DDS_header ;

/*	the following constants were copied directly off the MSDN website	*/

/*	The dwFlags member of the original DDSURFACEDESC2 structure
	can be set to one or more of the following values.	*/
#define DDSD_CAPS	0x00000001
#define DDSD_HEIGHT	0x00000002
#define DDSD_WIDTH	0x00000004
#define DDSD_PITCH	0x00000008
#define DDSD_PIXELFORMAT	0x00001000
#define DDSD_MIPMAPCOUNT	0x00020000
#define DDSD_LINEARSIZE	0x00080000
#define DDSD_DEPTH	0x00800000

/*	DirectDraw Pixel Format	*/
#define DDPF_ALPHAPIXELS	0x00000001
#define DDPF_FOURCC	0x00000004
#define DDPF_RGB	0x00000040

/*	The dwCaps1 member of the DDSCAPS2 structure can be
	set to one or more of the following values.	*/
#define DDSCAPS_COMPLEX	0x00000008
#define DDSCAPS_TEXTURE	0x00001000
#define DDSCAPS_MIPMAP	0x00400000

/*	The dwCaps2 member of the DDSCAPS2 structure can be
	set to one or more of the following values.		*/
#define DDSCAPS2_CUBEMAP	0x00000200
#define DDSCAPS2_CUBEMAP_POSITIVEX	0x00000400
#define DDSCAPS2_CUBEMAP_NEGATIVEX	0x00000800
#define DDSCAPS2_CUBEMAP_POSITIVEY	0x00001000
#define DDSCAPS2_CUBEMAP_NEGATIVEY	0x00002000
#define DDSCAPS2_CUBEMAP_POSITIVEZ	0x00004000
#define DDSCAPS2_CUBEMAP_NEGATIVEZ	0x00008000
#define DDSCAPS2_VOLUME	0x00200000

#endif /* HEADER_IMAGE_DXT	*/

Added ext/soil/image_helper.c.







































































































































































































































































































































































































































































































































































































































































































































































































































































































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/*
    Jonathan Dummer

    image helper functions

    MIT license
*/

#include "image_helper.h"
#include <stdlib.h>
#include <math.h>

/*	Upscaling the image uses simple bilinear interpolation	*/
int
	up_scale_image
	(
		const unsigned char* const orig,
		int width, int height, int channels,
		unsigned char* resampled,
		int resampled_width, int resampled_height
	)
{
	float dx, dy;
	int x, y, c;

    /* error(s) check	*/
    if ( 	(width < 1) || (height < 1) ||
            (resampled_width < 2) || (resampled_height < 2) ||
            (channels < 1) ||
            (NULL == orig) || (NULL == resampled) )
    {
        /*	signify badness	*/
        return 0;
    }
    /*
		for each given pixel in the new map, find the exact location
		from the original map which would contribute to this guy
	*/
    dx = (width - 1.0f) / (resampled_width - 1.0f);
    dy = (height - 1.0f) / (resampled_height - 1.0f);
    for ( y = 0; y < resampled_height; ++y )
    {
    	/* find the base y index and fractional offset from that	*/
    	float sampley = y * dy;
    	int inty = (int)sampley;
    	/*	if( inty < 0 ) { inty = 0; } else	*/
		if( inty > height - 2 ) { inty = height - 2; }
		sampley -= inty;
        for ( x = 0; x < resampled_width; ++x )
        {
			float samplex = x * dx;
			int intx = (int)samplex;
			int base_index;
			/* find the base x index and fractional offset from that	*/
			/*	if( intx < 0 ) { intx = 0; } else	*/
			if( intx > width - 2 ) { intx = width - 2; }
			samplex -= intx;
			/*	base index into the original image	*/
			base_index = (inty * width + intx) * channels;
            for ( c = 0; c < channels; ++c )
            {
            	/*	do the sampling	*/
				float value = 0.5f;
				value += orig[base_index]
							*(1.0f-samplex)*(1.0f-sampley);
				value += orig[base_index+channels]
							*(samplex)*(1.0f-sampley);
				value += orig[base_index+width*channels]
							*(1.0f-samplex)*(sampley);
				value += orig[base_index+width*channels+channels]
							*(samplex)*(sampley);
				/*	move to the next channel	*/
				++base_index;
            	/*	save the new value	*/
            	resampled[y*resampled_width*channels+x*channels+c] =
						(unsigned char)(value);
            }
        }
    }
    /*	done	*/
    return 1;
}

int
	mipmap_image
	(
		const unsigned char* const orig,
		int width, int height, int channels,
		unsigned char* resampled,
		int block_size_x, int block_size_y
	)
{
	int mip_width, mip_height;
	int i, j, c;

	/*	error check	*/
	if( (width < 1) || (height < 1) ||
		(channels < 1) || (orig == NULL) ||
		(resampled == NULL) ||
		(block_size_x < 1) || (block_size_y < 1) )
	{
		/*	nothing to do	*/
		return 0;
	}
	mip_width = width / block_size_x;
	mip_height = height / block_size_y;
	if( mip_width < 1 )
	{
		mip_width = 1;
	}
	if( mip_height < 1 )
	{
		mip_height = 1;
	}
	for( j = 0; j < mip_height; ++j )
	{
		for( i = 0; i < mip_width; ++i )
		{
			for( c = 0; c < channels; ++c )
			{
				const int index = (j*block_size_y)*width*channels + (i*block_size_x)*channels + c;
				int sum_value;
				int u,v;
				int u_block = block_size_x;
				int v_block = block_size_y;
				int block_area;
				/*	do a bit of checking so we don't over-run the boundaries
					(necessary for non-square textures!)	*/
				if( block_size_x * (i+1) > width )
				{
					u_block = width - i*block_size_y;
				}
				if( block_size_y * (j+1) > height )
				{
					v_block = height - j*block_size_y;
				}
				block_area = u_block*v_block;
				/*	for this pixel, see what the average
					of all the values in the block are.
					note: start the sum at the rounding value, not at 0	*/
				sum_value = block_area >> 1;
				for( v = 0; v < v_block; ++v )
				for( u = 0; u < u_block; ++u )
				{
					sum_value += orig[index + v*width*channels + u*channels];
				}
				resampled[j*mip_width*channels + i*channels + c] = sum_value / block_area;
			}
		}
	}
	return 1;
}

int
	scale_image_RGB_to_NTSC_safe
	(
		unsigned char* orig,
		int width, int height, int channels
	)
{
	const float scale_lo = 16.0f - 0.499f;
	const float scale_hi = 235.0f + 0.499f;
	int i, j;
	int nc = channels;
	unsigned char scale_LUT[256];
	/*	error check	*/
	if( (width < 1) || (height < 1) ||
		(channels < 1) || (orig == NULL) )
	{
		/*	nothing to do	*/
		return 0;
	}
	/*	set up the scaling Look Up Table	*/
	for( i = 0; i < 256; ++i )
	{
		scale_LUT[i] = (unsigned char)((scale_hi - scale_lo) * i / 255.0f + scale_lo);
	}
	/*	for channels = 2 or 4, ignore the alpha component	*/
	nc -= 1 - (channels & 1);
	/*	OK, go through the image and scale any non-alpha components	*/
	for( i = 0; i < width*height*channels; i += channels )
	{
		for( j = 0; j < nc; ++j )
		{
			orig[i+j] = scale_LUT[orig[i+j]];
		}
	}
	return 1;
}

unsigned char clamp_byte( int x ) { return ( (x) < 0 ? (0) : ( (x) > 255 ? 255 : (x) ) ); }

/*
	This function takes the RGB components of the image
	and converts them into YCoCg.  3 components will be
	re-ordered to CoYCg (for optimum DXT1 compression),
	while 4 components will be ordered CoCgAY (for DXT5
	compression).
*/
int
	convert_RGB_to_YCoCg
	(
		unsigned char* orig,
		int width, int height, int channels
	)
{
	int i;
	/*	error check	*/
	if( (width < 1) || (height < 1) ||
		(channels < 3) || (channels > 4) ||
		(orig == NULL) )
	{
		/*	nothing to do	*/
		return -1;
	}
	/*	do the conversion	*/
	if( channels == 3 )
	{
		for( i = 0; i < width*height*3; i += 3 )
		{
			int r = orig[i+0];
			int g = (orig[i+1] + 1) >> 1;
			int b = orig[i+2];
			int tmp = (2 + r + b) >> 2;
			/*	Co	*/
			orig[i+0] = clamp_byte( 128 + ((r - b + 1) >> 1) );
			/*	Y	*/
			orig[i+1] = clamp_byte( g + tmp );
			/*	Cg	*/
			orig[i+2] = clamp_byte( 128 + g - tmp );
		}
	} else
	{
		for( i = 0; i < width*height*4; i += 4 )
		{
			int r = orig[i+0];
			int g = (orig[i+1] + 1) >> 1;
			int b = orig[i+2];
			unsigned char a = orig[i+3];
			int tmp = (2 + r + b) >> 2;
			/*	Co	*/
			orig[i+0] = clamp_byte( 128 + ((r - b + 1) >> 1) );
			/*	Cg	*/
			orig[i+1] = clamp_byte( 128 + g - tmp );
			/*	Alpha	*/
			orig[i+2] = a;
			/*	Y	*/
			orig[i+3] = clamp_byte( g + tmp );
		}
	}
	/*	done	*/
	return 0;
}

/*
	This function takes the YCoCg components of the image
	and converts them into RGB.  See above.
*/
int
	convert_YCoCg_to_RGB
	(
		unsigned char* orig,
		int width, int height, int channels
	)
{
	int i;
	/*	error check	*/
	if( (width < 1) || (height < 1) ||
		(channels < 3) || (channels > 4) ||
		(orig == NULL) )
	{
		/*	nothing to do	*/
		return -1;
	}
	/*	do the conversion	*/
	if( channels == 3 )
	{
		for( i = 0; i < width*height*3; i += 3 )
		{
			int co = orig[i+0] - 128;
			int y  = orig[i+1];
			int cg = orig[i+2] - 128;
			/*	R	*/
			orig[i+0] = clamp_byte( y + co - cg );
			/*	G	*/
			orig[i+1] = clamp_byte( y + cg );
			/*	B	*/
			orig[i+2] = clamp_byte( y - co - cg );
		}
	} else
	{
		for( i = 0; i < width*height*4; i += 4 )
		{
			int co = orig[i+0] - 128;
			int cg = orig[i+1] - 128;
			unsigned char a  = orig[i+2];
			int y  = orig[i+3];
			/*	R	*/
			orig[i+0] = clamp_byte( y + co - cg );
			/*	G	*/
			orig[i+1] = clamp_byte( y + cg );
			/*	B	*/
			orig[i+2] = clamp_byte( y - co - cg );
			/*	A	*/
			orig[i+3] = a;
		}
	}
	/*	done	*/
	return 0;
}

float
find_max_RGBE
(
	unsigned char *image,
    int width, int height
)
{
	float max_val = 0.0f;
	unsigned char *img = image;
	int i, j;
	for( i = width * height; i > 0; --i )
	{
		/* float scale = powf( 2.0f, img[3] - 128.0f ) / 255.0f; */
		float scale = ldexp( 1.0f / 255.0f, (int)(img[3]) - 128 );
		for( j = 0; j < 3; ++j )
		{
			if( img[j] * scale > max_val )
			{
				max_val = img[j] * scale;
			}
		}
		/* next pixel */
		img += 4;
	}
	return max_val;
}

int
RGBE_to_RGBdivA
(
    unsigned char *image,
    int width, int height,
    int rescale_to_max
)
{
	/* local variables */
	int i, iv;
	unsigned char *img = image;
	float scale = 1.0f;
	/* error check */
	if( (!image) || (width < 1) || (height < 1) )
	{
		return 0;
	}
	/* convert (note: no negative numbers, but 0.0 is possible) */
	if( rescale_to_max )
	{
		scale = 255.0f / find_max_RGBE( image, width, height );
	}
	for( i = width * height; i > 0; --i )
	{
		/* decode this pixel, and find the max */
		float r,g,b,e, m;
		/* e = scale * powf( 2.0f, img[3] - 128.0f ) / 255.0f; */
		e = scale * ldexp( 1.0f / 255.0f, (int)(img[3]) - 128 );
		r = e * img[0];
		g = e * img[1];
		b = e * img[2];
		m = (r > g) ? r : g;
		m = (b > m) ? b : m;
		/* and encode it into RGBdivA */
		iv = (m != 0.0f) ? (int)(255.0f / m) : 1.0f;
		iv = (iv < 1) ? 1 : iv;
		img[3] = (iv > 255) ? 255 : iv;
		iv = (int)(img[3] * r + 0.5f);
		img[0] = (iv > 255) ? 255 : iv;
		iv = (int)(img[3] * g + 0.5f);
		img[1] = (iv > 255) ? 255 : iv;
		iv = (int)(img[3] * b + 0.5f);
		img[2] = (iv > 255) ? 255 : iv;
		/* and on to the next pixel */
		img += 4;
	}
	return 1;
}

int
RGBE_to_RGBdivA2
(
    unsigned char *image,
    int width, int height,
    int rescale_to_max
)
{
	/* local variables */
	int i, iv;
	unsigned char *img = image;
	float scale = 1.0f;
	/* error check */
	if( (!image) || (width < 1) || (height < 1) )
	{
		return 0;
	}
	/* convert (note: no negative numbers, but 0.0 is possible) */
	if( rescale_to_max )
	{
		scale = 255.0f * 255.0f / find_max_RGBE( image, width, height );
	}
	for( i = width * height; i > 0; --i )
	{
		/* decode this pixel, and find the max */
		float r,g,b,e, m;
		/* e = scale * powf( 2.0f, img[3] - 128.0f ) / 255.0f; */
		e = scale * ldexp( 1.0f / 255.0f, (int)(img[3]) - 128 );
		r = e * img[0];
		g = e * img[1];
		b = e * img[2];
		m = (r > g) ? r : g;
		m = (b > m) ? b : m;
		/* and encode it into RGBdivA */
		iv = (m != 0.0f) ? (int)sqrtf( 255.0f * 255.0f / m ) : 1.0f;
		iv = (iv < 1) ? 1 : iv;
		img[3] = (iv > 255) ? 255 : iv;
		iv = (int)(img[3] * img[3] * r / 255.0f + 0.5f);
		img[0] = (iv > 255) ? 255 : iv;
		iv = (int)(img[3] * img[3] * g / 255.0f + 0.5f);
		img[1] = (iv > 255) ? 255 : iv;
		iv = (int)(img[3] * img[3] * b / 255.0f + 0.5f);
		img[2] = (iv > 255) ? 255 : iv;
		/* and on to the next pixel */
		img += 4;
	}
	return 1;
}

Added ext/soil/image_helper.h.







































































































































































































































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/*
    Jonathan Dummer

    Image helper functions

    MIT license
*/

#ifndef HEADER_IMAGE_HELPER
#define HEADER_IMAGE_HELPER

#ifdef __cplusplus
extern "C" {
#endif

/**
	This function upscales an image.
	Not to be used to create MIPmaps,
	but to make it square,
	or to make it a power-of-two sized.
**/
int
	up_scale_image
	(
		const unsigned char* const orig,
		int width, int height, int channels,
		unsigned char* resampled,
		int resampled_width, int resampled_height
	);

/**
	This function downscales an image.
	Used for creating MIPmaps,
	the incoming image should be a
	power-of-two sized.
**/
int
	mipmap_image
	(
		const unsigned char* const orig,
		int width, int height, int channels,
		unsigned char* resampled,
		int block_size_x, int block_size_y
	);

/**
	This function takes the RGB components of the image
	and scales each channel from [0,255] to [16,235].
	This makes the colors "Safe" for display on NTSC
	displays.  Note that this is _NOT_ a good idea for
	loading images like normal- or height-maps!
**/
int
	scale_image_RGB_to_NTSC_safe
	(
		unsigned char* orig,
		int width, int height, int channels
	);

/**
	This function takes the RGB components of the image
	and converts them into YCoCg.  3 components will be
	re-ordered to CoYCg (for optimum DXT1 compression),
	while 4 components will be ordered CoCgAY (for DXT5
	compression).
**/
int
	convert_RGB_to_YCoCg
	(
		unsigned char* orig,
		int width, int height, int channels
	);

/**
	This function takes the YCoCg components of the image
	and converts them into RGB.  See above.
**/
int
	convert_YCoCg_to_RGB
	(
		unsigned char* orig,
		int width, int height, int channels
	);

/**
	Converts an HDR image from an array
	of unsigned chars (RGBE) to RGBdivA
	\return 0 if failed, otherwise returns 1
**/
int
	RGBE_to_RGBdivA
	(
		unsigned char *image,
		int width, int height,
		int rescale_to_max
	);

/**
	Converts an HDR image from an array
	of unsigned chars (RGBE) to RGBdivA2
	\return 0 if failed, otherwise returns 1
**/
int
	RGBE_to_RGBdivA2
	(
		unsigned char *image,
		int width, int height,
		int rescale_to_max
	);

#ifdef __cplusplus
}
#endif

#endif /* HEADER_IMAGE_HELPER	*/

Added ext/soil/stb_image_aug.c.














































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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/* stbi-1.16 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c
                      when you control the images you're loading

   QUICK NOTES:
      Primarily of interest to game developers and other people who can
          avoid problematic images and only need the trivial interface

      JPEG baseline (no JPEG progressive, no oddball channel decimations)
      PNG non-interlaced
      BMP non-1bpp, non-RLE
      TGA (not sure what subset, if a subset)
      PSD (composited view only, no extra channels)
      HDR (radiance rgbE format)
      writes BMP,TGA (define STBI_NO_WRITE to remove code)
      decoded from memory or through stdio FILE (define STBI_NO_STDIO to remove code)
      supports installable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD)

   TODO:
      stbi_info_*

   history:
      1.16   major bugfix - convert_format converted one too many pixels
      1.15   initialize some fields for thread safety
      1.14   fix threadsafe conversion bug; header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
      1.13   threadsafe
      1.12   const qualifiers in the API
      1.11   Support installable IDCT, colorspace conversion routines
      1.10   Fixes for 64-bit (don't use "unsigned long")
             optimized upsampling by Fabian "ryg" Giesen
      1.09   Fix format-conversion for PSD code (bad global variables!)
      1.08   Thatcher Ulrich's PSD code integrated by Nicolas Schulz
      1.07   attempt to fix C++ warning/errors again
      1.06   attempt to fix C++ warning/errors again
      1.05   fix TGA loading to return correct *comp and use good luminance calc
      1.04   default float alpha is 1, not 255; use 'void *' for stbi_image_free
      1.03   bugfixes to STBI_NO_STDIO, STBI_NO_HDR
      1.02   support for (subset of) HDR files, float interface for preferred access to them
      1.01   fix bug: possible bug in handling right-side up bmps... not sure
             fix bug: the stbi_bmp_load() and stbi_tga_load() functions didn't work at all
      1.00   interface to zlib that skips zlib header
      0.99   correct handling of alpha in palette
      0.98   TGA loader by lonesock; dynamically add loaders (untested)
      0.97   jpeg errors on too large a file; also catch another malloc failure
      0.96   fix detection of invalid v value - particleman@mollyrocket forum
      0.95   during header scan, seek to markers in case of padding
      0.94   STBI_NO_STDIO to disable stdio usage; rename all #defines the same
      0.93   handle jpegtran output; verbose errors
      0.92   read 4,8,16,24,32-bit BMP files of several formats
      0.91   output 24-bit Windows 3.0 BMP files
      0.90   fix a few more warnings; bump version number to approach 1.0
      0.61   bugfixes due to Marc LeBlanc, Christopher Lloyd
      0.60   fix compiling as c++
      0.59   fix warnings: merge Dave Moore's -Wall fixes
      0.58   fix bug: zlib uncompressed mode len/nlen was wrong endian
      0.57   fix bug: jpg last huffman symbol before marker was >9 bits but less
                      than 16 available
      0.56   fix bug: zlib uncompressed mode len vs. nlen
      0.55   fix bug: restart_interval not initialized to 0
      0.54   allow NULL for 'int *comp'
      0.53   fix bug in png 3->4; speedup png decoding
      0.52   png handles req_comp=3,4 directly; minor cleanup; jpeg comments
      0.51   obey req_comp requests, 1-component jpegs return as 1-component,
             on 'test' only check type, not whether we support this variant
*/

#include "stb_image_aug.h"

#ifndef STBI_NO_HDR
#include <math.h>  // ldexp
#include <string.h> // strcmp
#endif

#ifndef STBI_NO_STDIO
#include <stdio.h>
#endif
#include <stdlib.h>
#include <memory.h>
#include <assert.h>
#include <stdarg.h>

#ifndef _MSC_VER
  #ifdef __cplusplus
  #define __forceinline inline
  #else
  #define __forceinline
  #endif
#endif


// implementation:
typedef unsigned char uint8;
typedef unsigned short uint16;
typedef   signed short  int16;
typedef unsigned int   uint32;
typedef   signed int    int32;
typedef unsigned int   uint;

// should produce compiler error if size is wrong
typedef unsigned char validate_uint32[sizeof(uint32)==4];

#if defined(STBI_NO_STDIO) && !defined(STBI_NO_WRITE)
#define STBI_NO_WRITE
#endif

#ifndef STBI_NO_DDS
#include "stbi_DDS_aug.h"
#endif

//	I (JLD) want full messages for SOIL
#define STBI_FAILURE_USERMSG 1

//////////////////////////////////////////////////////////////////////////////
//
// Generic API that works on all image types
//

// this is not threadsafe
static char *failure_reason;

char *stbi_failure_reason(void)
{
   return failure_reason;
}

static int e(char *str)
{
   failure_reason = str;
   return 0;
}

#ifdef STBI_NO_FAILURE_STRINGS
   #define e(x,y)  0
#elif defined(STBI_FAILURE_USERMSG)
   #define e(x,y)  e(y)
#else
   #define e(x,y)  e(x)
#endif

#define epf(x,y)   ((float *) (e(x,y)?NULL:NULL))
#define epuc(x,y)  ((unsigned char *) (e(x,y)?NULL:NULL))

void stbi_image_free(void *retval_from_stbi_load)
{
   free(retval_from_stbi_load);
}

#define MAX_LOADERS  32
stbi_loader *loaders[MAX_LOADERS];
static int max_loaders = 0;

int stbi_register_loader(stbi_loader *loader)
{
   int i;
   for (i=0; i < MAX_LOADERS; ++i) {
      // already present?
      if (loaders[i] == loader)
         return 1;
      // end of the list?
      if (loaders[i] == NULL) {
         loaders[i] = loader;
         max_loaders = i+1;
         return 1;
      }
   }
   // no room for it
   return 0;
}

#ifndef STBI_NO_HDR
static float   *ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
static stbi_uc *hdr_to_ldr(float   *data, int x, int y, int comp);
#endif

#ifndef STBI_NO_STDIO
unsigned char *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
{
   FILE *f = fopen(filename, "rb");
   unsigned char *result;
   if (!f) return epuc("can't fopen", "Unable to open file");
   result = stbi_load_from_file(f,x,y,comp,req_comp);
   fclose(f);
   return result;
}

unsigned char *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
{
   int i;
   if (stbi_jpeg_test_file(f))
      return stbi_jpeg_load_from_file(f,x,y,comp,req_comp);
   if (stbi_png_test_file(f))
      return stbi_png_load_from_file(f,x,y,comp,req_comp);
   if (stbi_bmp_test_file(f))
      return stbi_bmp_load_from_file(f,x,y,comp,req_comp);
   if (stbi_psd_test_file(f))
      return stbi_psd_load_from_file(f,x,y,comp,req_comp);
   #ifndef STBI_NO_DDS
   if (stbi_dds_test_file(f))
      return stbi_dds_load_from_file(f,x,y,comp,req_comp);
   #endif
   #ifndef STBI_NO_HDR
   if (stbi_hdr_test_file(f)) {
      float *hdr = stbi_hdr_load_from_file(f, x,y,comp,req_comp);
      return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
   }
   #endif
   for (i=0; i < max_loaders; ++i)
      if (loaders[i]->test_file(f))
         return loaders[i]->load_from_file(f,x,y,comp,req_comp);
   // test tga last because it's a crappy test!
   if (stbi_tga_test_file(f))
      return stbi_tga_load_from_file(f,x,y,comp,req_comp);
   return epuc("unknown image type", "Image not of any known type, or corrupt");
}
#endif

unsigned char *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
   int i;
   if (stbi_jpeg_test_memory(buffer,len))
      return stbi_jpeg_load_from_memory(buffer,len,x,y,comp,req_comp);
   if (stbi_png_test_memory(buffer,len))
      return stbi_png_load_from_memory(buffer,len,x,y,comp,req_comp);
   if (stbi_bmp_test_memory(buffer,len))
      return stbi_bmp_load_from_memory(buffer,len,x,y,comp,req_comp);
   if (stbi_psd_test_memory(buffer,len))
      return stbi_psd_load_from_memory(buffer,len,x,y,comp,req_comp);
   #ifndef STBI_NO_DDS
   if (stbi_dds_test_memory(buffer,len))
      return stbi_dds_load_from_memory(buffer,len,x,y,comp,req_comp);
   #endif
   #ifndef STBI_NO_HDR
   if (stbi_hdr_test_memory(buffer, len)) {
      float *hdr = stbi_hdr_load_from_memory(buffer, len,x,y,comp,req_comp);
      return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
   }
   #endif
   for (i=0; i < max_loaders; ++i)
      if (loaders[i]->test_memory(buffer,len))
         return loaders[i]->load_from_memory(buffer,len,x,y,comp,req_comp);
   // test tga last because it's a crappy test!
   if (stbi_tga_test_memory(buffer,len))
      return stbi_tga_load_from_memory(buffer,len,x,y,comp,req_comp);
   return epuc("unknown image type", "Image not of any known type, or corrupt");
}

#ifndef STBI_NO_HDR

#ifndef STBI_NO_STDIO
float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
{
   FILE *f = fopen(filename, "rb");
   float *result;
   if (!f) return epf("can't fopen", "Unable to open file");
   result = stbi_loadf_from_file(f,x,y,comp,req_comp);
   fclose(f);
   return result;
}

float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
{
   unsigned char *data;
   #ifndef STBI_NO_HDR
   if (stbi_hdr_test_file(f))
      return stbi_hdr_load_from_file(f,x,y,comp,req_comp);
   #endif
   data = stbi_load_from_file(f, x, y, comp, req_comp);
   if (data)
      return ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
   return epf("unknown image type", "Image not of any known type, or corrupt");
}
#endif

float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
   stbi_uc *data;
   #ifndef STBI_NO_HDR
   if (stbi_hdr_test_memory(buffer, len))
      return stbi_hdr_load_from_memory(buffer, len,x,y,comp,req_comp);
   #endif
   data = stbi_load_from_memory(buffer, len, x, y, comp, req_comp);
   if (data)
      return ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
   return epf("unknown image type", "Image not of any known type, or corrupt");
}
#endif

// these is-hdr-or-not is defined independent of whether STBI_NO_HDR is
// defined, for API simplicity; if STBI_NO_HDR is defined, it always
// reports false!

int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
{
   #ifndef STBI_NO_HDR
   return stbi_hdr_test_memory(buffer, len);
   #else
   return 0;
   #endif
}

#ifndef STBI_NO_STDIO
extern int      stbi_is_hdr          (char const *filename)
{
   FILE *f = fopen(filename, "rb");
   int result=0;
   if (f) {
      result = stbi_is_hdr_from_file(f);
      fclose(f);
   }
   return result;
}

extern int      stbi_is_hdr_from_file(FILE *f)
{
   #ifndef STBI_NO_HDR
   return stbi_hdr_test_file(f);
   #else
   return 0;
   #endif
}

#endif

// @TODO: get image dimensions & components without fully decoding
#ifndef STBI_NO_STDIO
extern int      stbi_info            (char const *filename,           int *x, int *y, int *comp);
extern int      stbi_info_from_file  (FILE *f,                  int *x, int *y, int *comp);
#endif
extern int      stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);

#ifndef STBI_NO_HDR
static float h2l_gamma_i=1.0f/2.2f, h2l_scale_i=1.0f;
static float l2h_gamma=2.2f, l2h_scale=1.0f;

void   stbi_hdr_to_ldr_gamma(float gamma) { h2l_gamma_i = 1/gamma; }
void   stbi_hdr_to_ldr_scale(float scale) { h2l_scale_i = 1/scale; }

void   stbi_ldr_to_hdr_gamma(float gamma) { l2h_gamma = gamma; }
void   stbi_ldr_to_hdr_scale(float scale) { l2h_scale = scale; }
#endif


//////////////////////////////////////////////////////////////////////////////
//
// Common code used by all image loaders
//

enum
{
   SCAN_load=0,
   SCAN_type,
   SCAN_header,
};

typedef struct
{
   uint32 img_x, img_y;
   int img_n, img_out_n;

   #ifndef STBI_NO_STDIO
   FILE  *img_file;
   #endif
   uint8 *img_buffer, *img_buffer_end;
} stbi;

#ifndef STBI_NO_STDIO
static void start_file(stbi *s, FILE *f)
{
   s->img_file = f;
}
#endif

static void start_mem(stbi *s, uint8 const *buffer, int len)
{
#ifndef STBI_NO_STDIO
   s->img_file = NULL;
#endif
   s->img_buffer = (uint8 *) buffer;
   s->img_buffer_end = (uint8 *) buffer+len;
}

__forceinline static int get8(stbi *s)
{
#ifndef STBI_NO_STDIO
   if (s->img_file) {
      int c = fgetc(s->img_file);
      return c == EOF ? 0 : c;
   }
#endif
   if (s->img_buffer < s->img_buffer_end)
      return *s->img_buffer++;
   return 0;
}

__forceinline static int at_eof(stbi *s)
{
#ifndef STBI_NO_STDIO
   if (s->img_file)
      return feof(s->img_file);
#endif
   return s->img_buffer >= s->img_buffer_end;
}

__forceinline static uint8 get8u(stbi *s)
{
   return (uint8) get8(s);
}

static void skip(stbi *s, int n)
{
#ifndef STBI_NO_STDIO
   if (s->img_file)
      fseek(s->img_file, n, SEEK_CUR);
   else
#endif
      s->img_buffer += n;
}

static int get16(stbi *s)
{
   int z = get8(s);
   return (z << 8) + get8(s);
}

static uint32 get32(stbi *s)
{
   uint32 z = get16(s);
   return (z << 16) + get16(s);
}

static int get16le(stbi *s)
{
   int z = get8(s);
   return z + (get8(s) << 8);
}

static uint32 get32le(stbi *s)
{
   uint32 z = get16le(s);
   return z + (get16le(s) << 16);
}

static void getn(stbi *s, stbi_uc *buffer, int n)
{
#ifndef STBI_NO_STDIO
   if (s->img_file) {
      fread(buffer, 1, n, s->img_file);
      return;
   }
#endif
   memcpy(buffer, s->img_buffer, n);
   s->img_buffer += n;
}

//////////////////////////////////////////////////////////////////////////////
//
//  generic converter from built-in img_n to req_comp
//    individual types do this automatically as much as possible (e.g. jpeg
//    does all cases internally since it needs to colorspace convert anyway,
//    and it never has alpha, so very few cases ). png can automatically
//    interleave an alpha=255 channel, but falls back to this for other cases
//
//  assume data buffer is malloced, so malloc a new one and free that one
//  only failure mode is malloc failing

static uint8 compute_y(int r, int g, int b)
{
   return (uint8) (((r*77) + (g*150) +  (29*b)) >> 8);
}

static unsigned char *convert_format(unsigned char *data, int img_n, int req_comp, uint x, uint y)
{
   int i,j;
   unsigned char *good;

   if (req_comp == img_n) return data;
   assert(req_comp >= 1 && req_comp <= 4);

   good = (unsigned char *) malloc(req_comp * x * y);
   if (good == NULL) {
      free(data);
      return epuc("outofmem", "Out of memory");
   }

   for (j=0; j < (int) y; ++j) {
      unsigned char *src  = data + j * x * img_n   ;
      unsigned char *dest = good + j * x * req_comp;

      #define COMBO(a,b)  ((a)*8+(b))
      #define CASE(a,b)   case COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
      // convert source image with img_n components to one with req_comp components;
      // avoid switch per pixel, so use switch per scanline and massive macros
      switch(COMBO(img_n, req_comp)) {
         CASE(1,2) dest[0]=src[0], dest[1]=255; break;
         CASE(1,3) dest[0]=dest[1]=dest[2]=src[0]; break;
         CASE(1,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; break;
         CASE(2,1) dest[0]=src[0]; break;
         CASE(2,3) dest[0]=dest[1]=dest[2]=src[0]; break;
         CASE(2,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; break;
         CASE(3,4) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; break;
         CASE(3,1) dest[0]=compute_y(src[0],src[1],src[2]); break;
         CASE(3,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = 255; break;
         CASE(4,1) dest[0]=compute_y(src[0],src[1],src[2]); break;
         CASE(4,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = src[3]; break;
         CASE(4,3) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; break;
         default: assert(0);
      }
      #undef CASE
   }

   free(data);
   return good;
}

#ifndef STBI_NO_HDR
static float   *ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
{
   int i,k,n;
   float *output = (float *) malloc(x * y * comp * sizeof(float));
   if (output == NULL) { free(data); return epf("outofmem", "Out of memory"); }
   // compute number of non-alpha components
   if (comp & 1) n = comp; else n = comp-1;
   for (i=0; i < x*y; ++i) {
      for (k=0; k < n; ++k) {
         output[i*comp + k] = (float) pow(data[i*comp+k]/255.0f, l2h_gamma) * l2h_scale;
      }
      if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f;
   }
   free(data);
   return output;
}

#define float2int(x)   ((int) (x))
static stbi_uc *hdr_to_ldr(float   *data, int x, int y, int comp)
{
   int i,k,n;
   stbi_uc *output = (stbi_uc *) malloc(x * y * comp);
   if (output == NULL) { free(data); return epuc("outofmem", "Out of memory"); }
   // compute number of non-alpha components
   if (comp & 1) n = comp; else n = comp-1;
   for (i=0; i < x*y; ++i) {
      for (k=0; k < n; ++k) {
         float z = (float) pow(data[i*comp+k]*h2l_scale_i, h2l_gamma_i) * 255 + 0.5f;
         if (z < 0) z = 0;
         if (z > 255) z = 255;
         output[i*comp + k] = float2int(z);
      }
      if (k < comp) {
         float z = data[i*comp+k] * 255 + 0.5f;
         if (z < 0) z = 0;
         if (z > 255) z = 255;
         output[i*comp + k] = float2int(z);
      }
   }
   free(data);
   return output;
}
#endif

//////////////////////////////////////////////////////////////////////////////
//
//  "baseline" JPEG/JFIF decoder (not actually fully baseline implementation)
//
//    simple implementation
//      - channel subsampling of at most 2 in each dimension
//      - doesn't support delayed output of y-dimension
//      - simple interface (only one output format: 8-bit interleaved RGB)
//      - doesn't try to recover corrupt jpegs
//      - doesn't allow partial loading, loading multiple at once
//      - still fast on x86 (copying globals into locals doesn't help x86)
//      - allocates lots of intermediate memory (full size of all components)
//        - non-interleaved case requires this anyway
//        - allows good upsampling (see next)
//    high-quality
//      - upsampled channels are bilinearly interpolated, even across blocks
//      - quality integer IDCT derived from IJG's 'slow'
//    performance
//      - fast huffman; reasonable integer IDCT
//      - uses a lot of intermediate memory, could cache poorly
//      - load http://nothings.org/remote/anemones.jpg 3 times on 2.8Ghz P4
//          stb_jpeg:   1.34 seconds (MSVC6, default release build)
//          stb_jpeg:   1.06 seconds (MSVC6, processor = Pentium Pro)
//          IJL11.dll:  1.08 seconds (compiled by intel)
//          IJG 1998:   0.98 seconds (MSVC6, makefile provided by IJG)
//          IJG 1998:   0.95 seconds (MSVC6, makefile + proc=PPro)

// huffman decoding acceleration
#define FAST_BITS   9  // larger handles more cases; smaller stomps less cache

typedef struct
{
   uint8  fast[1 << FAST_BITS];
   // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
   uint16 code[256];
   uint8  values[256];
   uint8  size[257];
   unsigned int maxcode[18];
   int    delta[17];   // old 'firstsymbol' - old 'firstcode'
} huffman;

typedef struct
{
   #if STBI_SIMD
   unsigned short dequant2[4][64];
   #endif
   stbi s;
   huffman huff_dc[4];
   huffman huff_ac[4];
   uint8 dequant[4][64];

// sizes for components, interleaved MCUs
   int img_h_max, img_v_max;
   int img_mcu_x, img_mcu_y;
   int img_mcu_w, img_mcu_h;

// definition of jpeg image component
   struct
   {
      int id;
      int h,v;
      int tq;
      int hd,ha;
      int dc_pred;

      int x,y,w2,h2;
      uint8 *data;
      void *raw_data;
      uint8 *linebuf;
   } img_comp[4];

   uint32         code_buffer; // jpeg entropy-coded buffer
   int            code_bits;   // number of valid bits
   unsigned char  marker;      // marker seen while filling entropy buffer
   int            nomore;      // flag if we saw a marker so must stop

   int scan_n, order[4];
   int restart_interval, todo;
} jpeg;

static int build_huffman(huffman *h, int *count)
{
   int i,j,k=0,code;
   // build size list for each symbol (from JPEG spec)
   for (i=0; i < 16; ++i)
      for (j=0; j < count[i]; ++j)
         h->size[k++] = (uint8) (i+1);
   h->size[k] = 0;

   // compute actual symbols (from jpeg spec)
   code = 0;
   k = 0;
   for(j=1; j <= 16; ++j) {
      // compute delta to add to code to compute symbol id
      h->delta[j] = k - code;
      if (h->size[k] == j) {
         while (h->size[k] == j)
            h->code[k++] = (uint16) (code++);
         if (code-1 >= (1 << j)) return e("bad code lengths","Corrupt JPEG");
      }
      // compute largest code + 1 for this size, preshifted as needed later
      h->maxcode[j] = code << (16-j);
      code <<= 1;
   }
   h->maxcode[j] = 0xffffffff;

   // build non-spec acceleration table; 255 is flag for not-accelerated
   memset(h->fast, 255, 1 << FAST_BITS);
   for (i=0; i < k; ++i) {
      int s = h->size[i];
      if (s <= FAST_BITS) {
         int c = h->code[i] << (FAST_BITS-s);
         int m = 1 << (FAST_BITS-s);
         for (j=0; j < m; ++j) {
            h->fast[c+j] = (uint8) i;
         }
      }
   }
   return 1;
}

static void grow_buffer_unsafe(jpeg *j)
{
   do {
      int b = j->nomore ? 0 : get8(&j->s);
      if (b == 0xff) {
         int c = get8(&j->s);
         if (c != 0) {
            j->marker = (unsigned char) c;
            j->nomore = 1;
            return;
         }
      }
      j->code_buffer = (j->code_buffer << 8) | b;
      j->code_bits += 8;
   } while (j->code_bits <= 24);
}

// (1 << n) - 1
static uint32 bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535};

// decode a jpeg huffman value from the bitstream
__forceinline static int decode(jpeg *j, huffman *h)
{
   unsigned int temp;
   int c,k;

   if (j->code_bits < 16) grow_buffer_unsafe(j);

   // look at the top FAST_BITS and determine what symbol ID it is,
   // if the code is <= FAST_BITS
   c = (j->code_buffer >> (j->code_bits - FAST_BITS)) & ((1 << FAST_BITS)-1);
   k = h->fast[c];
   if (k < 255) {
      if (h->size[k] > j->code_bits)
         return -1;
      j->code_bits -= h->size[k];
      return h->values[k];
   }

   // naive test is to shift the code_buffer down so k bits are
   // valid, then test against maxcode. To speed this up, we've
   // preshifted maxcode left so that it has (16-k) 0s at the
   // end; in other words, regardless of the number of bits, it
   // wants to be compared against something shifted to have 16;
   // that way we don't need to shift inside the loop.
   if (j->code_bits < 16)
      temp = (j->code_buffer << (16 - j->code_bits)) & 0xffff;
   else
      temp = (j->code_buffer >> (j->code_bits - 16)) & 0xffff;
   for (k=FAST_BITS+1 ; ; ++k)
      if (temp < h->maxcode[k])
         break;
   if (k == 17) {
      // error! code not found
      j->code_bits -= 16;
      return -1;
   }

   if (k > j->code_bits)
      return -1;

   // convert the huffman code to the symbol id
   c = ((j->code_buffer >> (j->code_bits - k)) & bmask[k]) + h->delta[k];
   assert((((j->code_buffer) >> (j->code_bits - h->size[c])) & bmask[h->size[c]]) == h->code[c]);

   // convert the id to a symbol
   j->code_bits -= k;
   return h->values[c];
}

// combined JPEG 'receive' and JPEG 'extend', since baseline
// always extends everything it receives.
__forceinline static int extend_receive(jpeg *j, int n)
{
   unsigned int m = 1 << (n-1);
   unsigned int k;
   if (j->code_bits < n) grow_buffer_unsafe(j);
   k = (j->code_buffer >> (j->code_bits - n)) & bmask[n];
   j->code_bits -= n;
   // the following test is probably a random branch that won't
   // predict well. I tried to table accelerate it but failed.
   // maybe it's compiling as a conditional move?
   if (k < m)
      return (-1 << n) + k + 1;
   else
      return k;
}

// given a value that's at position X in the zigzag stream,
// where does it appear in the 8x8 matrix coded as row-major?
static uint8 dezigzag[64+15] =
{
    0,  1,  8, 16,  9,  2,  3, 10,
   17, 24, 32, 25, 18, 11,  4,  5,
   12, 19, 26, 33, 40, 48, 41, 34,
   27, 20, 13,  6,  7, 14, 21, 28,
   35, 42, 49, 56, 57, 50, 43, 36,
   29, 22, 15, 23, 30, 37, 44, 51,
   58, 59, 52, 45, 38, 31, 39, 46,
   53, 60, 61, 54, 47, 55, 62, 63,
   // let corrupt input sample past end
   63, 63, 63, 63, 63, 63, 63, 63,
   63, 63, 63, 63, 63, 63, 63
};

// decode one 64-entry block--
static int decode_block(jpeg *j, short data[64], huffman *hdc, huffman *hac, int b)
{
   int diff,dc,k;
   int t = decode(j, hdc);
   if (t < 0) return e("bad huffman code","Corrupt JPEG");

   // 0 all the ac values now so we can do it 32-bits at a time
   memset(data,0,64*sizeof(data[0]));

   diff = t ? extend_receive(j, t) : 0;
   dc = j->img_comp[b].dc_pred + diff;
   j->img_comp[b].dc_pred = dc;
   data[0] = (short) dc;

   // decode AC components, see JPEG spec
   k = 1;
   do {
      int r,s;
      int rs = decode(j, hac);
      if (rs < 0) return e("bad huffman code","Corrupt JPEG");
      s = rs & 15;
      r = rs >> 4;
      if (s == 0) {
         if (rs != 0xf0) break; // end block
         k += 16;
      } else {
         k += r;
         // decode into unzigzag'd location
         data[dezigzag[k++]] = (short) extend_receive(j,s);
      }
   } while (k < 64);
   return 1;
}

// take a -128..127 value and clamp it and convert to 0..255
__forceinline static uint8 clamp(int x)
{
   x += 128;
   // trick to use a single test to catch both cases
   if ((unsigned int) x > 255) {
      if (x < 0) return 0;
      if (x > 255) return 255;
   }
   return (uint8) x;
}

#define f2f(x)  (int) (((x) * 4096 + 0.5))
#define fsh(x)  ((x) << 12)

// derived from jidctint -- DCT_ISLOW
#define IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7)       \
   int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \
   p2 = s2;                                    \
   p3 = s6;                                    \
   p1 = (p2+p3) * f2f(0.5411961f);             \
   t2 = p1 + p3*f2f(-1.847759065f);            \
   t3 = p1 + p2*f2f( 0.765366865f);            \
   p2 = s0;                                    \
   p3 = s4;                                    \
   t0 = fsh(p2+p3);                            \
   t1 = fsh(p2-p3);                            \
   x0 = t0+t3;                                 \
   x3 = t0-t3;                                 \
   x1 = t1+t2;                                 \
   x2 = t1-t2;                                 \
   t0 = s7;                                    \
   t1 = s5;                                    \
   t2 = s3;                                    \
   t3 = s1;                                    \
   p3 = t0+t2;                                 \
   p4 = t1+t3;                                 \
   p1 = t0+t3;                                 \
   p2 = t1+t2;                                 \
   p5 = (p3+p4)*f2f( 1.175875602f);            \
   t0 = t0*f2f( 0.298631336f);                 \
   t1 = t1*f2f( 2.053119869f);                 \
   t2 = t2*f2f( 3.072711026f);                 \
   t3 = t3*f2f( 1.501321110f);                 \
   p1 = p5 + p1*f2f(-0.899976223f);            \
   p2 = p5 + p2*f2f(-2.562915447f);            \
   p3 = p3*f2f(-1.961570560f);                 \
   p4 = p4*f2f(-0.390180644f);                 \
   t3 += p1+p4;                                \
   t2 += p2+p3;                                \
   t1 += p2+p4;                                \
   t0 += p1+p3;

#if !STBI_SIMD
// .344 seconds on 3*anemones.jpg
static void idct_block(uint8 *out, int out_stride, short data[64], uint8 *dequantize)
{
   int i,val[64],*v=val;
   uint8 *o,*dq = dequantize;
   short *d = data;

   // columns
   for (i=0; i < 8; ++i,++d,++dq, ++v) {
      // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
      if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
           && d[40]==0 && d[48]==0 && d[56]==0) {
         //    no shortcut                 0     seconds
         //    (1|2|3|4|5|6|7)==0          0     seconds
         //    all separate               -0.047 seconds
         //    1 && 2|3 && 4|5 && 6|7:    -0.047 seconds
         int dcterm = d[0] * dq[0] << 2;
         v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
      } else {
         IDCT_1D(d[ 0]*dq[ 0],d[ 8]*dq[ 8],d[16]*dq[16],d[24]*dq[24],
                 d[32]*dq[32],d[40]*dq[40],d[48]*dq[48],d[56]*dq[56])
         // constants scaled things up by 1<<12; let's bring them back
         // down, but keep 2 extra bits of precision
         x0 += 512; x1 += 512; x2 += 512; x3 += 512;
         v[ 0] = (x0+t3) >> 10;
         v[56] = (x0-t3) >> 10;
         v[ 8] = (x1+t2) >> 10;
         v[48] = (x1-t2) >> 10;
         v[16] = (x2+t1) >> 10;
         v[40] = (x2-t1) >> 10;
         v[24] = (x3+t0) >> 10;
         v[32] = (x3-t0) >> 10;
      }
   }

   for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
      // no fast case since the first 1D IDCT spread components out
      IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
      // constants scaled things up by 1<<12, plus we had 1<<2 from first
      // loop, plus horizontal and vertical each scale by sqrt(8) so together
      // we've got an extra 1<<3, so 1<<17 total we need to remove.
      x0 += 65536; x1 += 65536; x2 += 65536; x3 += 65536;
      o[0] = clamp((x0+t3) >> 17);
      o[7] = clamp((x0-t3) >> 17);
      o[1] = clamp((x1+t2) >> 17);
      o[6] = clamp((x1-t2) >> 17);
      o[2] = clamp((x2+t1) >> 17);
      o[5] = clamp((x2-t1) >> 17);
      o[3] = clamp((x3+t0) >> 17);
      o[4] = clamp((x3-t0) >> 17);
   }
}
#else
static void idct_block(uint8 *out, int out_stride, short data[64], unsigned short *dequantize)
{
   int i,val[64],*v=val;
   uint8 *o;
   unsigned short *dq = dequantize;
   short *d = data;

   // columns
   for (i=0; i < 8; ++i,++d,++dq, ++v) {
      // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
      if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
           && d[40]==0 && d[48]==0 && d[56]==0) {
         //    no shortcut                 0     seconds
         //    (1|2|3|4|5|6|7)==0          0     seconds
         //    all separate               -0.047 seconds
         //    1 && 2|3 && 4|5 && 6|7:    -0.047 seconds
         int dcterm = d[0] * dq[0] << 2;
         v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
      } else {
         IDCT_1D(d[ 0]*dq[ 0],d[ 8]*dq[ 8],d[16]*dq[16],d[24]*dq[24],
                 d[32]*dq[32],d[40]*dq[40],d[48]*dq[48],d[56]*dq[56])
         // constants scaled things up by 1<<12; let's bring them back
         // down, but keep 2 extra bits of precision
         x0 += 512; x1 += 512; x2 += 512; x3 += 512;
         v[ 0] = (x0+t3) >> 10;
         v[56] = (x0-t3) >> 10;
         v[ 8] = (x1+t2) >> 10;
         v[48] = (x1-t2) >> 10;
         v[16] = (x2+t1) >> 10;
         v[40] = (x2-t1) >> 10;
         v[24] = (x3+t0) >> 10;
         v[32] = (x3-t0) >> 10;
      }
   }

   for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
      // no fast case since the first 1D IDCT spread components out
      IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
      // constants scaled things up by 1<<12, plus we had 1<<2 from first
      // loop, plus horizontal and vertical each scale by sqrt(8) so together
      // we've got an extra 1<<3, so 1<<17 total we need to remove.
      x0 += 65536; x1 += 65536; x2 += 65536; x3 += 65536;
      o[0] = clamp((x0+t3) >> 17);
      o[7] = clamp((x0-t3) >> 17);
      o[1] = clamp((x1+t2) >> 17);
      o[6] = clamp((x1-t2) >> 17);
      o[2] = clamp((x2+t1) >> 17);
      o[5] = clamp((x2-t1) >> 17);
      o[3] = clamp((x3+t0) >> 17);
      o[4] = clamp((x3-t0) >> 17);
   }
}
static stbi_idct_8x8 stbi_idct_installed = idct_block;

extern void stbi_install_idct(stbi_idct_8x8 func)
{
   stbi_idct_installed = func;
}
#endif

#define MARKER_none  0xff
// if there's a pending marker from the entropy stream, return that
// otherwise, fetch from the stream and get a marker. if there's no
// marker, return 0xff, which is never a valid marker value
static uint8 get_marker(jpeg *j)
{
   uint8 x;
   if (j->marker != MARKER_none) { x = j->marker; j->marker = MARKER_none; return x; }
   x = get8u(&j->s);
   if (x != 0xff) return MARKER_none;
   while (x == 0xff)
      x = get8u(&j->s);
   return x;
}

// in each scan, we'll have scan_n components, and the order
// of the components is specified by order[]
#define RESTART(x)     ((x) >= 0xd0 && (x) <= 0xd7)

// after a restart interval, reset the entropy decoder and
// the dc prediction
static void reset(jpeg *j)
{
   j->code_bits = 0;
   j->code_buffer = 0;
   j->nomore = 0;
   j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0;
   j->marker = MARKER_none;
   j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
   // no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
   // since we don't even allow 1<<30 pixels
}

static int parse_entropy_coded_data(jpeg *z)
{
   reset(z);
   if (z->scan_n == 1) {
      int i,j;
      #if STBI_SIMD
      __declspec(align(16))
      #endif
      short data[64];
      int n = z->order[0];
      // non-interleaved data, we just need to process one block at a time,
      // in trivial scanline order
      // number of blocks to do just depends on how many actual "pixels" this
      // component has, independent of interleaved MCU blocking and such
      int w = (z->img_comp[n].x+7) >> 3;
      int h = (z->img_comp[n].y+7) >> 3;
      for (j=0; j < h; ++j) {
         for (i=0; i < w; ++i) {
            if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0;
            #if STBI_SIMD
            stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]);
            #else
            idct_block(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]);
            #endif
            // every data block is an MCU, so countdown the restart interval
            if (--z->todo <= 0) {
               if (z->code_bits < 24) grow_buffer_unsafe(z);
               // if it's NOT a restart, then just bail, so we get corrupt data
               // rather than no data
               if (!RESTART(z->marker)) return 1;
               reset(z);
            }
         }
      }
   } else { // interleaved!
      int i,j,k,x,y;
      short data[64];
      for (j=0; j < z->img_mcu_y; ++j) {
         for (i=0; i < z->img_mcu_x; ++i) {
            // scan an interleaved mcu... process scan_n components in order
            for (k=0; k < z->scan_n; ++k) {
               int n = z->order[k];
               // scan out an mcu's worth of this component; that's just determined
               // by the basic H and V specified for the component
               for (y=0; y < z->img_comp[n].v; ++y) {
                  for (x=0; x < z->img_comp[n].h; ++x) {
                     int x2 = (i*z->img_comp[n].h + x)*8;
                     int y2 = (j*z->img_comp[n].v + y)*8;
                     if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0;
                     #if STBI_SIMD
                     stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]);
                     #else
                     idct_block(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]);
                     #endif
                  }
               }
            }
            // after all interleaved components, that's an interleaved MCU,
            // so now count down the restart interval
            if (--z->todo <= 0) {
               if (z->code_bits < 24) grow_buffer_unsafe(z);
               // if it's NOT a restart, then just bail, so we get corrupt data
               // rather than no data
               if (!RESTART(z->marker)) return 1;
               reset(z);
            }
         }
      }
   }
   return 1;
}

static int process_marker(jpeg *z, int m)
{
   int L;
   switch (m) {
      case MARKER_none: // no marker found
         return e("expected marker","Corrupt JPEG");

      case 0xC2: // SOF - progressive
         return e("progressive jpeg","JPEG format not supported (progressive)");

      case 0xDD: // DRI - specify restart interval
         if (get16(&z->s) != 4) return e("bad DRI len","Corrupt JPEG");
         z->restart_interval = get16(&z->s);
         return 1;

      case 0xDB: // DQT - define quantization table
         L = get16(&z->s)-2;
         while (L > 0) {
            int q = get8(&z->s);
            int p = q >> 4;
            int t = q & 15,i;
            if (p != 0) return e("bad DQT type","Corrupt JPEG");
            if (t > 3) return e("bad DQT table","Corrupt JPEG");
            for (i=0; i < 64; ++i)
               z->dequant[t][dezigzag[i]] = get8u(&z->s);
            #if STBI_SIMD
            for (i=0; i < 64; ++i)
               z->dequant2[t][i] = dequant[t][i];
            #endif
            L -= 65;
         }
         return L==0;

      case 0xC4: // DHT - define huffman table
         L = get16(&z->s)-2;
         while (L > 0) {
            uint8 *v;
            int sizes[16],i,m=0;
            int q = get8(&z->s);
            int tc = q >> 4;
            int th = q & 15;
            if (tc > 1 || th > 3) return e("bad DHT header","Corrupt JPEG");
            for (i=0; i < 16; ++i) {
               sizes[i] = get8(&z->s);
               m += sizes[i];
            }
            L -= 17;
            if (tc == 0) {
               if (!build_huffman(z->huff_dc+th, sizes)) return 0;
               v = z->huff_dc[th].values;
            } else {
               if (!build_huffman(z->huff_ac+th, sizes)) return 0;
               v = z->huff_ac[th].values;
            }
            for (i=0; i < m; ++i)
               v[i] = get8u(&z->s);
            L -= m;
         }
         return L==0;
   }
   // check for comment block or APP blocks
   if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
      skip(&z->s, get16(&z->s)-2);
      return 1;
   }
   return 0;
}

// after we see SOS
static int process_scan_header(jpeg *z)
{
   int i;
   int Ls = get16(&z->s);
   z->scan_n = get8(&z->s);
   if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s.img_n) return e("bad SOS component count","Corrupt JPEG");
   if (Ls != 6+2*z->scan_n) return e("bad SOS len","Corrupt JPEG");
   for (i=0; i < z->scan_n; ++i) {
      int id = get8(&z->s), which;
      int q = get8(&z->s);
      for (which = 0; which < z->s.img_n; ++which)
         if (z->img_comp[which].id == id)
            break;
      if (which == z->s.img_n) return 0;
      z->img_comp[which].hd = q >> 4;   if (z->img_comp[which].hd > 3) return e("bad DC huff","Corrupt JPEG");
      z->img_comp[which].ha = q & 15;   if (z->img_comp[which].ha > 3) return e("bad AC huff","Corrupt JPEG");
      z->order[i] = which;
   }
   if (get8(&z->s) != 0) return e("bad SOS","Corrupt JPEG");
   get8(&z->s); // should be 63, but might be 0
   if (get8(&z->s) != 0) return e("bad SOS","Corrupt JPEG");

   return 1;
}

static int process_frame_header(jpeg *z, int scan)
{
   stbi *s = &z->s;
   int Lf,p,i,q, h_max=1,v_max=1,c;
   Lf = get16(s);         if (Lf < 11) return e("bad SOF len","Corrupt JPEG"); // JPEG
   p  = get8(s);          if (p != 8) return e("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
   s->img_y = get16(s);   if (s->img_y == 0) return e("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
   s->img_x = get16(s);   if (s->img_x == 0) return e("0 width","Corrupt JPEG"); // JPEG requires
   c = get8(s);
   if (c != 3 && c != 1) return e("bad component count","Corrupt JPEG");    // JFIF requires
   s->img_n = c;
   for (i=0; i < c; ++i) {
      z->img_comp[i].data = NULL;
      z->img_comp[i].linebuf = NULL;
   }

   if (Lf != 8+3*s->img_n) return e("bad SOF len","Corrupt JPEG");

   for (i=0; i < s->img_n; ++i) {
      z->img_comp[i].id = get8(s);
      if (z->img_comp[i].id != i+1)   // JFIF requires
         if (z->img_comp[i].id != i)  // some version of jpegtran outputs non-JFIF-compliant files!
            return e("bad component ID","Corrupt JPEG");
      q = get8(s);
      z->img_comp[i].h = (q >> 4);  if (!z->img_comp[i].h || z->img_comp[i].h > 4) return e("bad H","Corrupt JPEG");
      z->img_comp[i].v = q & 15;    if (!z->img_comp[i].v || z->img_comp[i].v > 4) return e("bad V","Corrupt JPEG");
      z->img_comp[i].tq = get8(s);  if (z->img_comp[i].tq > 3) return e("bad TQ","Corrupt JPEG");
   }

   if (scan != SCAN_load) return 1;

   if ((1 << 30) / s->img_x / s->img_n < s->img_y) return e("too large", "Image too large to decode");

   for (i=0; i < s->img_n; ++i) {
      if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
      if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
   }

   // compute interleaved mcu info
   z->img_h_max = h_max;
   z->img_v_max = v_max;
   z->img_mcu_w = h_max * 8;
   z->img_mcu_h = v_max * 8;
   z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w;
   z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h;

   for (i=0; i < s->img_n; ++i) {
      // number of effective pixels (e.g. for non-interleaved MCU)
      z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max;
      z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max;
      // to simplify generation, we'll allocate enough memory to decode
      // the bogus oversized data from using interleaved MCUs and their
      // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
      // discard the extra data until colorspace conversion
      z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
      z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
      z->img_comp[i].raw_data = malloc(z->img_comp[i].w2 * z->img_comp[i].h2+15);
      if (z->img_comp[i].raw_data == NULL) {
         for(--i; i >= 0; --i) {
            free(z->img_comp[i].raw_data);
            z->img_comp[i].data = NULL;
         }
         return e("outofmem", "Out of memory");
      }
      // align blocks for installable-idct using mmx/sse
      z->img_comp[i].data = (uint8*) (((size_t) z->img_comp[i].raw_data + 15) & ~15);
      z->img_comp[i].linebuf = NULL;
   }

   return 1;
}

// use comparisons since in some cases we handle more than one case (e.g. SOF)
#define DNL(x)         ((x) == 0xdc)
#define SOI(x)         ((x) == 0xd8)
#define EOI(x)         ((x) == 0xd9)
#define SOF(x)         ((x) == 0xc0 || (x) == 0xc1)
#define SOS(x)         ((x) == 0xda)

static int decode_jpeg_header(jpeg *z, int scan)
{
   int m;
   z->marker = MARKER_none; // initialize cached marker to empty
   m = get_marker(z);
   if (!SOI(m)) return e("no SOI","Corrupt JPEG");
   if (scan == SCAN_type) return 1;
   m = get_marker(z);
   while (!SOF(m)) {
      if (!process_marker(z,m)) return 0;
      m = get_marker(z);
      while (m == MARKER_none) {
         // some files have extra padding after their blocks, so ok, we'll scan
         if (at_eof(&z->s)) return e("no SOF", "Corrupt JPEG");
         m = get_marker(z);
      }
   }
   if (!process_frame_header(z, scan)) return 0;
   return 1;
}

static int decode_jpeg_image(jpeg *j)
{
   int m;
   j->restart_interval = 0;
   if (!decode_jpeg_header(j, SCAN_load)) return 0;
   m = get_marker(j);
   while (!EOI(m)) {
      if (SOS(m)) {
         if (!process_scan_header(j)) return 0;
         if (!parse_entropy_coded_data(j)) return 0;
      } else {
         if (!process_marker(j, m)) return 0;
      }
      m = get_marker(j);
   }
   return 1;
}

// static jfif-centered resampling (across block boundaries)

typedef uint8 *(*resample_row_func)(uint8 *out, uint8 *in0, uint8 *in1,
                                    int w, int hs);

#define div4(x) ((uint8) ((x) >> 2))

static uint8 *resample_row_1(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
{
   return in_near;
}

static uint8* resample_row_v_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
{
   // need to generate two samples vertically for every one in input
   int i;
   for (i=0; i < w; ++i)
      out[i] = div4(3*in_near[i] + in_far[i] + 2);
   return out;
}

static uint8*  resample_row_h_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
{
   // need to generate two samples horizontally for every one in input
   int i;
   uint8 *input = in_near;
   if (w == 1) {
      // if only one sample, can't do any interpolation
      out[0] = out[1] = input[0];
      return out;
   }

   out[0] = input[0];
   out[1] = div4(input[0]*3 + input[1] + 2);
   for (i=1; i < w-1; ++i) {
      int n = 3*input[i]+2;
      out[i*2+0] = div4(n+input[i-1]);
      out[i*2+1] = div4(n+input[i+1]);
   }
   out[i*2+0] = div4(input[w-2]*3 + input[w-1] + 2);
   out[i*2+1] = input[w-1];
   return out;
}

#define div16(x) ((uint8) ((x) >> 4))

static uint8 *resample_row_hv_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
{
   // need to generate 2x2 samples for every one in input
   int i,t0,t1;
   if (w == 1) {
      out[0] = out[1] = div4(3*in_near[0] + in_far[0] + 2);
      return out;
   }

   t1 = 3*in_near[0] + in_far[0];
   out[0] = div4(t1+2);
   for (i=1; i < w; ++i) {
      t0 = t1;
      t1 = 3*in_near[i]+in_far[i];
      out[i*2-1] = div16(3*t0 + t1 + 8);
      out[i*2  ] = div16(3*t1 + t0 + 8);
   }
   out[w*2-1] = div4(t1+2);
   return out;
}

static uint8 *resample_row_generic(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
{
   // resample with nearest-neighbor
   int i,j;
   for (i=0; i < w; ++i)
      for (j=0; j < hs; ++j)
         out[i*hs+j] = in_near[i];
   return out;
}

#define float2fixed(x)  ((int) ((x) * 65536 + 0.5))

// 0.38 seconds on 3*anemones.jpg   (0.25 with processor = Pro)
// VC6 without processor=Pro is generating multiple LEAs per multiply!
static void YCbCr_to_RGB_row(uint8 *out, uint8 *y, uint8 *pcb, uint8 *pcr, int count, int step)
{
   int i;
   for (i=0; i < count; ++i) {
      int y_fixed = (y[i] << 16) + 32768; // rounding
      int r,g,b;
      int cr = pcr[i] - 128;
      int cb = pcb[i] - 128;
      r = y_fixed + cr*float2fixed(1.40200f);
      g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f);
      b = y_fixed                            + cb*float2fixed(1.77200f);
      r >>= 16;
      g >>= 16;
      b >>= 16;
      if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
      if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
      if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
      out[0] = (uint8)r;
      out[1] = (uint8)g;
      out[2] = (uint8)b;
      out[3] = 255;
      out += step;
   }
}

#if STBI_SIMD
static stbi_YCbCr_to_RGB_run stbi_YCbCr_installed = YCbCr_to_RGB_row;

void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func)
{
   stbi_YCbCr_installed = func;
}
#endif


// clean up the temporary component buffers
static void cleanup_jpeg(jpeg *j)
{
   int i;
   for (i=0; i < j->s.img_n; ++i) {
      if (j->img_comp[i].data) {
         free(j->img_comp[i].raw_data);
         j->img_comp[i].data = NULL;
      }
      if (j->img_comp[i].linebuf) {
         free(j->img_comp[i].linebuf);
         j->img_comp[i].linebuf = NULL;
      }
   }
}

typedef struct
{
   resample_row_func resample;
   uint8 *line0,*line1;
   int hs,vs;   // expansion factor in each axis
   int w_lores; // horizontal pixels pre-expansion
   int ystep;   // how far through vertical expansion we are
   int ypos;    // which pre-expansion row we're on
} stbi_resample;

static uint8 *load_jpeg_image(jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
{
   int n, decode_n;
   // validate req_comp
   if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp", "Internal error");
   z->s.img_n = 0;

   // load a jpeg image from whichever source
   if (!decode_jpeg_image(z)) { cleanup_jpeg(z); return NULL; }

   // determine actual number of components to generate
   n = req_comp ? req_comp : z->s.img_n;

   if (z->s.img_n == 3 && n < 3)
      decode_n = 1;
   else
      decode_n = z->s.img_n;

   // resample and color-convert
   {
      int k;
      uint i,j;
      uint8 *output;
      uint8 *coutput[4];

      stbi_resample res_comp[4];

      for (k=0; k < decode_n; ++k) {
         stbi_resample *r = &res_comp[k];

         // allocate line buffer big enough for upsampling off the edges
         // with upsample factor of 4
         z->img_comp[k].linebuf = (uint8 *) malloc(z->s.img_x + 3);
         if (!z->img_comp[k].linebuf) { cleanup_jpeg(z); return epuc("outofmem", "Out of memory"); }

         r->hs      = z->img_h_max / z->img_comp[k].h;
         r->vs      = z->img_v_max / z->img_comp[k].v;
         r->ystep   = r->vs >> 1;
         r->w_lores = (z->s.img_x + r->hs-1) / r->hs;
         r->ypos    = 0;
         r->line0   = r->line1 = z->img_comp[k].data;

         if      (r->hs == 1 && r->vs == 1) r->resample = resample_row_1;
         else if (r->hs == 1 && r->vs == 2) r->resample = resample_row_v_2;
         else if (r->hs == 2 && r->vs == 1) r->resample = resample_row_h_2;
         else if (r->hs == 2 && r->vs == 2) r->resample = resample_row_hv_2;
         else                               r->resample = resample_row_generic;
      }

      // can't error after this so, this is safe
      output = (uint8 *) malloc(n * z->s.img_x * z->s.img_y + 1);
      if (!output) { cleanup_jpeg(z); return epuc("outofmem", "Out of memory"); }

      // now go ahead and resample
      for (j=0; j < z->s.img_y; ++j) {
         uint8 *out = output + n * z->s.img_x * j;
         for (k=0; k < decode_n; ++k) {
            stbi_resample *r = &res_comp[k];
            int y_bot = r->ystep >= (r->vs >> 1);
            coutput[k] = r->resample(z->img_comp[k].linebuf,
                                     y_bot ? r->line1 : r->line0,
                                     y_bot ? r->line0 : r->line1,
                                     r->w_lores, r->hs);
            if (++r->ystep >= r->vs) {
               r->ystep = 0;
               r->line0 = r->line1;
               if (++r->ypos < z->img_comp[k].y)
                  r->line1 += z->img_comp[k].w2;
            }
         }
         if (n >= 3) {
            uint8 *y = coutput[0];
            if (z->s.img_n == 3) {
               #if STBI_SIMD
               stbi_YCbCr_installed(out, y, coutput[1], coutput[2], z->s.img_x, n);
               #else
               YCbCr_to_RGB_row(out, y, coutput[1], coutput[2], z->s.img_x, n);
               #endif
            } else
               for (i=0; i < z->s.img_x; ++i) {
                  out[0] = out[1] = out[2] = y[i];
                  out[3] = 255; // not used if n==3
                  out += n;
               }
         } else {
            uint8 *y = coutput[0];
            if (n == 1)
               for (i=0; i < z->s.img_x; ++i) out[i] = y[i];
            else
               for (i=0; i < z->s.img_x; ++i) *out++ = y[i], *out++ = 255;
         }
      }
      cleanup_jpeg(z);
      *out_x = z->s.img_x;
      *out_y = z->s.img_y;
      if (comp) *comp  = z->s.img_n; // report original components, not output
      return output;
   }
}

#ifndef STBI_NO_STDIO
unsigned char *stbi_jpeg_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
{
   jpeg j;
   start_file(&j.s, f);
   return load_jpeg_image(&j, x,y,comp,req_comp);
}

unsigned char *stbi_jpeg_load(char const *filename, int *x, int *y, int *comp, int req_comp)
{
   unsigned char *data;
   FILE *f = fopen(filename, "rb");
   if (!f) return NULL;
   data = stbi_jpeg_load_from_file(f,x,y,comp,req_comp);
   fclose(f);
   return data;
}
#endif

unsigned char *stbi_jpeg_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
   jpeg j;
   start_mem(&j.s, buffer,len);
   return load_jpeg_image(&j, x,y,comp,req_comp);
}

#ifndef STBI_NO_STDIO
int stbi_jpeg_test_file(FILE *f)
{
   int n,r;
   jpeg j;
   n = ftell(f);
   start_file(&j.s, f);
   r = decode_jpeg_header(&j, SCAN_type);
   fseek(f,n,SEEK_SET);
   return r;
}
#endif

int stbi_jpeg_test_memory(stbi_uc const *buffer, int len)
{
   jpeg j;
   start_mem(&j.s, buffer,len);
   return decode_jpeg_header(&j, SCAN_type);
}

// @TODO:
#ifndef STBI_NO_STDIO
extern int      stbi_jpeg_info            (char const *filename,           int *x, int *y, int *comp);
extern int      stbi_jpeg_info_from_file  (FILE *f,                  int *x, int *y, int *comp);
#endif
extern int      stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);

// public domain zlib decode    v0.2  Sean Barrett 2006-11-18
//    simple implementation
//      - all input must be provided in an upfront buffer
//      - all output is written to a single output buffer (can malloc/realloc)
//    performance
//      - fast huffman

// fast-way is faster to check than jpeg huffman, but slow way is slower
#define ZFAST_BITS  9 // accelerate all cases in default tables
#define ZFAST_MASK  ((1 << ZFAST_BITS) - 1)

// zlib-style huffman encoding
// (jpegs packs from left, zlib from right, so can't share code)
typedef struct
{
   uint16 fast[1 << ZFAST_BITS];
   uint16 firstcode[16];
   int maxcode[17];
   uint16 firstsymbol[16];
   uint8  size[288];
   uint16 value[288];
} zhuffman;

__forceinline static int bitreverse16(int n)
{
  n = ((n & 0xAAAA) >>  1) | ((n & 0x5555) << 1);
  n = ((n & 0xCCCC) >>  2) | ((n & 0x3333) << 2);
  n = ((n & 0xF0F0) >>  4) | ((n & 0x0F0F) << 4);
  n = ((n & 0xFF00) >>  8) | ((n & 0x00FF) << 8);
  return n;
}

__forceinline static int bit_reverse(int v, int bits)
{
   assert(bits <= 16);
   // to bit reverse n bits, reverse 16 and shift
   // e.g. 11 bits, bit reverse and shift away 5
   return bitreverse16(v) >> (16-bits);
}

static int zbuild_huffman(zhuffman *z, uint8 *sizelist, int num)
{
   int i,k=0;
   int code, next_code[16], sizes[17];

   // DEFLATE spec for generating codes
   memset(sizes, 0, sizeof(sizes));
   memset(z->fast, 255, sizeof(z->fast));
   for (i=0; i < num; ++i)
      ++sizes[sizelist[i]];
   sizes[0] = 0;
   for (i=1; i < 16; ++i)
      assert(sizes[i] <= (1 << i));
   code = 0;
   for (i=1; i < 16; ++i) {
      next_code[i] = code;
      z->firstcode[i] = (uint16) code;
      z->firstsymbol[i] = (uint16) k;
      code = (code + sizes[i]);
      if (sizes[i])
         if (code-1 >= (1 << i)) return e("bad codelengths","Corrupt JPEG");
      z->maxcode[i] = code << (16-i); // preshift for inner loop
      code <<= 1;
      k += sizes[i];
   }
   z->maxcode[16] = 0x10000; // sentinel
   for (i=0; i < num; ++i) {
      int s = sizelist[i];
      if (s) {
         int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
         z->size[c] = (uint8)s;
         z->value[c] = (uint16)i;
         if (s <= ZFAST_BITS) {
            int k = bit_reverse(next_code[s],s);
            while (k < (1 << ZFAST_BITS)) {
               z->fast[k] = (uint16) c;
               k += (1 << s);
            }
         }
         ++next_code[s];
      }
   }
   return 1;
}

// zlib-from-memory implementation for PNG reading
//    because PNG allows splitting the zlib stream arbitrarily,
//    and it's annoying structurally to have PNG call ZLIB call PNG,
//    we require PNG read all the IDATs and combine them into a single
//    memory buffer

typedef struct
{
   uint8 *zbuffer, *zbuffer_end;
   int num_bits;
   uint32 code_buffer;

   char *zout;
   char *zout_start;
   char *zout_end;
   int   z_expandable;

   zhuffman z_length, z_distance;
} zbuf;

__forceinline static int zget8(zbuf *z)
{
   if (z->zbuffer >= z->zbuffer_end) return 0;
   return *z->zbuffer++;
}

static void fill_bits(zbuf *z)
{
   do {
      assert(z->code_buffer < (1U << z->num_bits));
      z->code_buffer |= zget8(z) << z->num_bits;
      z->num_bits += 8;
   } while (z->num_bits <= 24);
}

__forceinline static unsigned int zreceive(zbuf *z, int n)
{
   unsigned int k;
   if (z->num_bits < n) fill_bits(z);
   k = z->code_buffer & ((1 << n) - 1);
   z->code_buffer >>= n;
   z->num_bits -= n;
   return k;
}

__forceinline static int zhuffman_decode(zbuf *a, zhuffman *z)
{
   int b,s,k;
   if (a->num_bits < 16) fill_bits(a);
   b = z->fast[a->code_buffer & ZFAST_MASK];
   if (b < 0xffff) {
      s = z->size[b];
      a->code_buffer >>= s;
      a->num_bits -= s;
      return z->value[b];
   }

   // not resolved by fast table, so compute it the slow way
   // use jpeg approach, which requires MSbits at top
   k = bit_reverse(a->code_buffer, 16);
   for (s=ZFAST_BITS+1; ; ++s)
      if (k < z->maxcode[s])
         break;
   if (s == 16) return -1; // invalid code!
   // code size is s, so:
   b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
   assert(z->size[b] == s);
   a->code_buffer >>= s;
   a->num_bits -= s;
   return z->value[b];
}

static int expand(zbuf *z, int n)  // need to make room for n bytes
{
   char *q;
   int cur, limit;
   if (!z->z_expandable) return e("output buffer limit","Corrupt PNG");
   cur   = (int) (z->zout     - z->zout_start);
   limit = (int) (z->zout_end - z->zout_start);
   while (cur + n > limit)
      limit *= 2;
   q = (char *) realloc(z->zout_start, limit);
   if (q == NULL) return e("outofmem", "Out of memory");
   z->zout_start = q;
   z->zout       = q + cur;
   z->zout_end   = q + limit;
   return 1;
}

static int length_base[31] = {
   3,4,5,6,7,8,9,10,11,13,
   15,17,19,23,27,31,35,43,51,59,
   67,83,99,115,131,163,195,227,258,0,0 };

static int length_extra[31]=
{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };

static int dist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};

static int dist_extra[32] =
{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};

static int parse_huffman_block(zbuf *a)
{
   for(;;) {
      int z = zhuffman_decode(a, &a->z_length);
      if (z < 256) {
         if (z < 0) return e("bad huffman code","Corrupt PNG"); // error in huffman codes
         if (a->zout >= a->zout_end) if (!expand(a, 1)) return 0;
         *a->zout++ = (char) z;
      } else {
         uint8 *p;
         int len,dist;
         if (z == 256) return 1;
         z -= 257;
         len = length_base[z];
         if (length_extra[z]) len += zreceive(a, length_extra[z]);
         z = zhuffman_decode(a, &a->z_distance);
         if (z < 0) return e("bad huffman code","Corrupt PNG");
         dist = dist_base[z];
         if (dist_extra[z]) dist += zreceive(a, dist_extra[z]);
         if (a->zout - a->zout_start < dist) return e("bad dist","Corrupt PNG");
         if (a->zout + len > a->zout_end) if (!expand(a, len)) return 0;
         p = (uint8 *) (a->zout - dist);
         while (len--)
            *a->zout++ = *p++;
      }
   }
}

static int compute_huffman_codes(zbuf *a)
{
   static uint8 length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
   static zhuffman z_codelength; // static just to save stack space
   uint8 lencodes[286+32+137];//padding for maximum single op
   uint8 codelength_sizes[19];
   int i,n;

   int hlit  = zreceive(a,5) + 257;
   int hdist = zreceive(a,5) + 1;
   int hclen = zreceive(a,4) + 4;

   memset(codelength_sizes, 0, sizeof(codelength_sizes));
   for (i=0; i < hclen; ++i) {
      int s = zreceive(a,3);
      codelength_sizes[length_dezigzag[i]] = (uint8) s;
   }
   if (!zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;

   n = 0;
   while (n < hlit + hdist) {
      int c = zhuffman_decode(a, &z_codelength);
      assert(c >= 0 && c < 19);
      if (c < 16)
         lencodes[n++] = (uint8) c;
      else if (c == 16) {
         c = zreceive(a,2)+3;
         memset(lencodes+n, lencodes[n-1], c);
         n += c;
      } else if (c == 17) {
         c = zreceive(a,3)+3;
         memset(lencodes+n, 0, c);
         n += c;
      } else {
         assert(c == 18);
         c = zreceive(a,7)+11;
         memset(lencodes+n, 0, c);
         n += c;
      }
   }
   if (n != hlit+hdist) return e("bad codelengths","Corrupt PNG");
   if (!zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
   if (!zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
   return 1;
}

static int parse_uncompressed_block(zbuf *a)
{
   uint8 header[4];
   int len,nlen,k;
   if (a->num_bits & 7)
      zreceive(a, a->num_bits & 7); // discard
   // drain the bit-packed data into header
   k = 0;
   while (a->num_bits > 0) {
      header[k++] = (uint8) (a->code_buffer & 255); // wtf this warns?
      a->code_buffer >>= 8;
      a->num_bits -= 8;
   }
   assert(a->num_bits == 0);
   // now fill header the normal way
   while (k < 4)
      header[k++] = (uint8) zget8(a);
   len  = header[1] * 256 + header[0];
   nlen = header[3] * 256 + header[2];
   if (nlen != (len ^ 0xffff)) return e("zlib corrupt","Corrupt PNG");
   if (a->zbuffer + len > a->zbuffer_end) return e("read past buffer","Corrupt PNG");
   if (a->zout + len > a->zout_end)
      if (!expand(a, len)) return 0;
   memcpy(a->zout, a->zbuffer, len);
   a->zbuffer += len;
   a->zout += len;
   return 1;
}

static int parse_zlib_header(zbuf *a)
{
   int cmf   = zget8(a);
   int cm    = cmf & 15;
   /* int cinfo = cmf >> 4; */
   int flg   = zget8(a);
   if ((cmf*256+flg) % 31 != 0) return e("bad zlib header","Corrupt PNG"); // zlib spec
   if (flg & 32) return e("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
   if (cm != 8) return e("bad compression","Corrupt PNG"); // DEFLATE required for png
   // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
   return 1;
}

// @TODO: should statically initialize these for optimal thread safety
static uint8 default_length[288], default_distance[32];
static void init_defaults(void)
{
   int i;   // use <= to match clearly with spec
   for (i=0; i <= 143; ++i)     default_length[i]   = 8;
   for (   ; i <= 255; ++i)     default_length[i]   = 9;
   for (   ; i <= 279; ++i)     default_length[i]   = 7;
   for (   ; i <= 287; ++i)     default_length[i]   = 8;

   for (i=0; i <=  31; ++i)     default_distance[i] = 5;
}

static int parse_zlib(zbuf *a, int parse_header)
{
   int final, type;
   if (parse_header)
      if (!parse_zlib_header(a)) return 0;
   a->num_bits = 0;
   a->code_buffer = 0;
   do {
      final = zreceive(a,1);
      type = zreceive(a,2);
      if (type == 0) {
         if (!parse_uncompressed_block(a)) return 0;
      } else if (type == 3) {
         return 0;
      } else {
         if (type == 1) {
            // use fixed code lengths
            if (!default_distance[31]) init_defaults();
            if (!zbuild_huffman(&a->z_length  , default_length  , 288)) return 0;
            if (!zbuild_huffman(&a->z_distance, default_distance,  32)) return 0;
         } else {
            if (!compute_huffman_codes(a)) return 0;
         }
         if (!parse_huffman_block(a)) return 0;
      }
   } while (!final);
   return 1;
}

static int do_zlib(zbuf *a, char *obuf, int olen, int exp, int parse_header)
{
   a->zout_start = obuf;
   a->zout       = obuf;
   a->zout_end   = obuf + olen;
   a->z_expandable = exp;

   return parse_zlib(a, parse_header);
}

char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
{
   zbuf a;
   char *p = (char *) malloc(initial_size);
   if (p == NULL) return NULL;
   a.zbuffer = (uint8 *) buffer;
   a.zbuffer_end = (uint8 *) buffer + len;
   if (do_zlib(&a, p, initial_size, 1, 1)) {
      if (outlen) *outlen = (int) (a.zout - a.zout_start);
      return a.zout_start;
   } else {
      free(a.zout_start);
      return NULL;
   }
}

char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
{
   return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
}

int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
{
   zbuf a;
   a.zbuffer = (uint8 *) ibuffer;
   a.zbuffer_end = (uint8 *) ibuffer + ilen;
   if (do_zlib(&a, obuffer, olen, 0, 1))
      return (int) (a.zout - a.zout_start);
   else
      return -1;
}

char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
{
   zbuf a;
   char *p = (char *) malloc(16384);
   if (p == NULL) return NULL;
   a.zbuffer = (uint8 *) buffer;
   a.zbuffer_end = (uint8 *) buffer+len;
   if (do_zlib(&a, p, 16384, 1, 0)) {
      if (outlen) *outlen = (int) (a.zout - a.zout_start);
      return a.zout_start;
   } else {
      free(a.zout_start);
      return NULL;
   }
}

int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
{
   zbuf a;
   a.zbuffer = (uint8 *) ibuffer;
   a.zbuffer_end = (uint8 *) ibuffer + ilen;
   if (do_zlib(&a, obuffer, olen, 0, 0))
      return (int) (a.zout - a.zout_start);
   else
      return -1;
}

// public domain "baseline" PNG decoder   v0.10  Sean Barrett 2006-11-18
//    simple implementation
//      - only 8-bit samples
//      - no CRC checking
//      - allocates lots of intermediate memory
//        - avoids problem of streaming data between subsystems
//        - avoids explicit window management
//    performance
//      - uses stb_zlib, a PD zlib implementation with fast huffman decoding


typedef struct
{
   uint32 length;
   uint32 type;
} chunk;

#define PNG_TYPE(a,b,c,d)  (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))

static chunk get_chunk_header(stbi *s)
{
   chunk c;
   c.length = get32(s);
   c.type   = get32(s);
   return c;
}

static int check_png_header(stbi *s)
{
   static uint8 png_sig[8] = { 137,80,78,71,13,10,26,10 };
   int i;
   for (i=0; i < 8; ++i)
      if (get8(s) != png_sig[i]) return e("bad png sig","Not a PNG");
   return 1;
}

typedef struct
{
   stbi s;
   uint8 *idata, *expanded, *out;
} png;


enum {
   F_none=0, F_sub=1, F_up=2, F_avg=3, F_paeth=4,
   F_avg_first, F_paeth_first,
};

static uint8 first_row_filter[5] =
{
   F_none, F_sub, F_none, F_avg_first, F_paeth_first
};

static int paeth(int a, int b, int c)
{
   int p = a + b - c;
   int pa = abs(p-a);
   int pb = abs(p-b);
   int pc = abs(p-c);
   if (pa <= pb && pa <= pc) return a;
   if (pb <= pc) return b;
   return c;
}

// create the png data from post-deflated data
static int create_png_image(png *a, uint8 *raw, uint32 raw_len, int out_n)
{
   stbi *s = &a->s;
   uint32 i,j,stride = s->img_x*out_n;
   int k;
   int img_n = s->img_n; // copy it into a local for later
   assert(out_n == s->img_n || out_n == s->img_n+1);
   a->out = (uint8 *) malloc(s->img_x * s->img_y * out_n);
   if (!a->out) return e("outofmem", "Out of memory");
   if (raw_len != (img_n * s->img_x + 1) * s->img_y) return e("not enough pixels","Corrupt PNG");
   for (j=0; j < s->img_y; ++j) {
      uint8 *cur = a->out + stride*j;
      uint8 *prior = cur - stride;
      int filter = *raw++;
      if (filter > 4) return e("invalid filter","Corrupt PNG");
      // if first row, use special filter that doesn't sample previous row
      if (j == 0) filter = first_row_filter[filter];
      // handle first pixel explicitly
      for (k=0; k < img_n; ++k) {
         switch(filter) {
            case F_none       : cur[k] = raw[k]; break;
            case F_sub        : cur[k] = raw[k]; break;
            case F_up         : cur[k] = raw[k] + prior[k]; break;
            case F_avg        : cur[k] = raw[k] + (prior[k]>>1); break;
            case F_paeth      : cur[k] = (uint8) (raw[k] + paeth(0,prior[k],0)); break;
            case F_avg_first  : cur[k] = raw[k]; break;
            case F_paeth_first: cur[k] = raw[k]; break;
         }
      }
      if (img_n != out_n) cur[img_n] = 255;
      raw += img_n;
      cur += out_n;
      prior += out_n;
      // this is a little gross, so that we don't switch per-pixel or per-component
      if (img_n == out_n) {
         #define CASE(f) \
             case f:     \
                for (i=s->img_x-1; i >= 1; --i, raw+=img_n,cur+=img_n,prior+=img_n) \
                   for (k=0; k < img_n; ++k)
         switch(filter) {
            CASE(F_none)  cur[k] = raw[k]; break;
            CASE(F_sub)   cur[k] = raw[k] + cur[k-img_n]; break;
            CASE(F_up)    cur[k] = raw[k] + prior[k]; break;
            CASE(F_avg)   cur[k] = raw[k] + ((prior[k] + cur[k-img_n])>>1); break;
            CASE(F_paeth)  cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],prior[k],prior[k-img_n])); break;
            CASE(F_avg_first)    cur[k] = raw[k] + (cur[k-img_n] >> 1); break;
            CASE(F_paeth_first)  cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],0,0)); break;
         }
         #undef CASE
      } else {
         assert(img_n+1 == out_n);
         #define CASE(f) \
             case f:     \
                for (i=s->img_x-1; i >= 1; --i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \
                   for (k=0; k < img_n; ++k)
         switch(filter) {
            CASE(F_none)  cur[k] = raw[k]; break;
            CASE(F_sub)   cur[k] = raw[k] + cur[k-out_n]; break;
            CASE(F_up)    cur[k] = raw[k] + prior[k]; break;
            CASE(F_avg)   cur[k] = raw[k] + ((prior[k] + cur[k-out_n])>>1); break;
            CASE(F_paeth)  cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],prior[k],prior[k-out_n])); break;
            CASE(F_avg_first)    cur[k] = raw[k] + (cur[k-out_n] >> 1); break;
            CASE(F_paeth_first)  cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],0,0)); break;
         }
         #undef CASE
      }
   }
   return 1;
}

static int compute_transparency(png *z, uint8 tc[3], int out_n)
{
   stbi *s = &z->s;
   uint32 i, pixel_count = s->img_x * s->img_y;
   uint8 *p = z->out;

   // compute color-based transparency, assuming we've
   // already got 255 as the alpha value in the output
   assert(out_n == 2 || out_n == 4);

   if (out_n == 2) {
      for (i=0; i < pixel_count; ++i) {
         p[1] = (p[0] == tc[0] ? 0 : 255);
         p += 2;
      }
   } else {
      for (i=0; i < pixel_count; ++i) {
         if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
            p[3] = 0;
         p += 4;
      }
   }
   return 1;
}

static int expand_palette(png *a, uint8 *palette, int len, int pal_img_n)
{
   uint32 i, pixel_count = a->s.img_x * a->s.img_y;
   uint8 *p, *temp_out, *orig = a->out;

   p = (uint8 *) malloc(pixel_count * pal_img_n);
   if (p == NULL) return e("outofmem", "Out of memory");

   // between here and free(out) below, exitting would leak
   temp_out = p;

   if (pal_img_n == 3) {
      for (i=0; i < pixel_count; ++i) {
         int n = orig[i]*4;
         p[0] = palette[n  ];
         p[1] = palette[n+1];
         p[2] = palette[n+2];
         p += 3;
      }
   } else {
      for (i=0; i < pixel_count; ++i) {
         int n = orig[i]*4;
         p[0] = palette[n  ];
         p[1] = palette[n+1];
         p[2] = palette[n+2];
         p[3] = palette[n+3];
         p += 4;
      }
   }
   free(a->out);
   a->out = temp_out;
   return 1;
}

static int parse_png_file(png *z, int scan, int req_comp)
{
   uint8 palette[1024], pal_img_n=0;
   uint8 has_trans=0, tc[3];
   uint32 ioff=0, idata_limit=0, i, pal_len=0;
   int first=1,k;
   stbi *s = &z->s;

   if (!check_png_header(s)) return 0;

   if (scan == SCAN_type) return 1;

   for(;;first=0) {
      chunk c = get_chunk_header(s);
      if (first && c.type != PNG_TYPE('I','H','D','R'))
         return e("first not IHDR","Corrupt PNG");
      switch (c.type) {
         case PNG_TYPE('I','H','D','R'): {
            int depth,color,interlace,comp,filter;
            if (!first) return e("multiple IHDR","Corrupt PNG");
            if (c.length != 13) return e("bad IHDR len","Corrupt PNG");
            s->img_x = get32(s); if (s->img_x > (1 << 24)) return e("too large","Very large image (corrupt?)");
            s->img_y = get32(s); if (s->img_y > (1 << 24)) return e("too large","Very large image (corrupt?)");
            depth = get8(s);  if (depth != 8)        return e("8bit only","PNG not supported: 8-bit only");
            color = get8(s);  if (color > 6)         return e("bad ctype","Corrupt PNG");
            if (color == 3) pal_img_n = 3; else if (color & 1) return e("bad ctype","Corrupt PNG");
            comp  = get8(s);  if (comp) return e("bad comp method","Corrupt PNG");
            filter= get8(s);  if (filter) return e("bad filter method","Corrupt PNG");
            interlace = get8(s); if (interlace) return e("interlaced","PNG not supported: interlaced mode");
            if (!s->img_x || !s->img_y) return e("0-pixel image","Corrupt PNG");
            if (!pal_img_n) {
               s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
               if ((1 << 30) / s->img_x / s->img_n < s->img_y) return e("too large", "Image too large to decode");
               if (scan == SCAN_header) return 1;
            } else {
               // if paletted, then pal_n is our final components, and
               // img_n is # components to decompress/filter.
               s->img_n = 1;
               if ((1 << 30) / s->img_x / 4 < s->img_y) return e("too large","Corrupt PNG");
               // if SCAN_header, have to scan to see if we have a tRNS
            }
            break;
         }

         case PNG_TYPE('P','L','T','E'):  {
            if (c.length > 256*3) return e("invalid PLTE","Corrupt PNG");
            pal_len = c.length / 3;
            if (pal_len * 3 != c.length) return e("invalid PLTE","Corrupt PNG");
            for (i=0; i < pal_len; ++i) {
               palette[i*4+0] = get8u(s);
               palette[i*4+1] = get8u(s);
               palette[i*4+2] = get8u(s);
               palette[i*4+3] = 255;
            }
            break;
         }

         case PNG_TYPE('t','R','N','S'): {
            if (z->idata) return e("tRNS after IDAT","Corrupt PNG");
            if (pal_img_n) {
               if (scan == SCAN_header) { s->img_n = 4; return 1; }
               if (pal_len == 0) return e("tRNS before PLTE","Corrupt PNG");
               if (c.length > pal_len) return e("bad tRNS len","Corrupt PNG");
               pal_img_n = 4;
               for (i=0; i < c.length; ++i)
                  palette[i*4+3] = get8u(s);
            } else {
               if (!(s->img_n & 1)) return e("tRNS with alpha","Corrupt PNG");
               if (c.length != (uint32) s->img_n*2) return e("bad tRNS len","Corrupt PNG");
               has_trans = 1;
               for (k=0; k < s->img_n; ++k)
                  tc[k] = (uint8) get16(s); // non 8-bit images will be larger
            }
            break;
         }

         case PNG_TYPE('I','D','A','T'): {
            if (pal_img_n && !pal_len) return e("no PLTE","Corrupt PNG");
            if (scan == SCAN_header) { s->img_n = pal_img_n; return 1; }
            if (ioff + c.length > idata_limit) {
               uint8 *p;
               if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
               while (ioff + c.length > idata_limit)
                  idata_limit *= 2;
               p = (uint8 *) realloc(z->idata, idata_limit); if (p == NULL) return e("outofmem", "Out of memory");
               z->idata = p;
            }
            #ifndef STBI_NO_STDIO
            if (s->img_file)
            {
               if (fread(z->idata+ioff,1,c.length,s->img_file) != c.length) return e("outofdata","Corrupt PNG");
            }
            else
            #endif
            {
               memcpy(z->idata+ioff, s->img_buffer, c.length);
               s->img_buffer += c.length;
            }
            ioff += c.length;
            break;
         }

         case PNG_TYPE('I','E','N','D'): {
            uint32 raw_len;
            if (scan != SCAN_load) return 1;
            if (z->idata == NULL) return e("no IDAT","Corrupt PNG");
            z->expanded = (uint8 *) stbi_zlib_decode_malloc((char *) z->idata, ioff, (int *) &raw_len);
            if (z->expanded == NULL) return 0; // zlib should set error
            free(z->idata); z->idata = NULL;
            if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans)
               s->img_out_n = s->img_n+1;
            else
               s->img_out_n = s->img_n;
            if (!create_png_image(z, z->expanded, raw_len, s->img_out_n)) return 0;
            if (has_trans)
               if (!compute_transparency(z, tc, s->img_out_n)) return 0;
            if (pal_img_n) {
               // pal_img_n == 3 or 4
               s->img_n = pal_img_n; // record the actual colors we had
               s->img_out_n = pal_img_n;
               if (req_comp >= 3) s->img_out_n = req_comp;
               if (!expand_palette(z, palette, pal_len, s->img_out_n))
                  return 0;
            }
            free(z->expanded); z->expanded = NULL;
            return 1;
         }

         default:
            // if critical, fail
            if ((c.type & (1 << 29)) == 0) {
               #ifndef STBI_NO_FAILURE_STRINGS
               // not threadsafe
               static char invalid_chunk[] = "XXXX chunk not known";
               invalid_chunk[0] = (uint8) (c.type >> 24);
               invalid_chunk[1] = (uint8) (c.type >> 16);
               invalid_chunk[2] = (uint8) (c.type >>  8);
               invalid_chunk[3] = (uint8) (c.type >>  0);
               #endif
               return e(invalid_chunk, "PNG not supported: unknown chunk type");
            }
            skip(s, c.length);
            break;
      }
      // end of chunk, read and skip CRC
      get32(s);
   }
}

static unsigned char *do_png(png *p, int *x, int *y, int *n, int req_comp)
{
   unsigned char *result=NULL;
   p->expanded = NULL;
   p->idata = NULL;
   p->out = NULL;
   if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp", "Internal error");
   if (parse_png_file(p, SCAN_load, req_comp)) {
      result = p->out;
      p->out = NULL;
      if (req_comp && req_comp != p->s.img_out_n) {
         result = convert_format(result, p->s.img_out_n, req_comp, p->s.img_x, p->s.img_y);
         p->s.img_out_n = req_comp;
         if (result == NULL) return result;
      }
      *x = p->s.img_x;
      *y = p->s.img_y;
      if (n) *n = p->s.img_n;
   }
   free(p->out);      p->out      = NULL;
   free(p->expanded); p->expanded = NULL;
   free(p->idata);    p->idata    = NULL;

   return result;
}

#ifndef STBI_NO_STDIO
unsigned char *stbi_png_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
{
   png p;
   start_file(&p.s, f);
   return do_png(&p, x,y,comp,req_comp);
}

unsigned char *stbi_png_load(char const *filename, int *x, int *y, int *comp, int req_comp)
{
   unsigned char *data;
   FILE *f = fopen(filename, "rb");
   if (!f) return NULL;
   data = stbi_png_load_from_file(f,x,y,comp,req_comp);
   fclose(f);
   return data;
}
#endif

unsigned char *stbi_png_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
   png p;
   start_mem(&p.s, buffer,len);
   return do_png(&p, x,y,comp,req_comp);
}

#ifndef STBI_NO_STDIO
int stbi_png_test_file(FILE *f)
{
   png p;
   int n,r;
   n = ftell(f);
   start_file(&p.s, f);
   r = parse_png_file(&p, SCAN_type,STBI_default);
   fseek(f,n,SEEK_SET);
   return r;
}
#endif

int stbi_png_test_memory(stbi_uc const *buffer, int len)
{
   png p;
   start_mem(&p.s, buffer, len);
   return parse_png_file(&p, SCAN_type,STBI_default);
}

// TODO: load header from png
#ifndef STBI_NO_STDIO
extern int      stbi_png_info             (char const *filename,           int *x, int *y, int *comp);
extern int      stbi_png_info_from_file   (FILE *f,                  int *x, int *y, int *comp);
#endif
extern int      stbi_png_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp);

// Microsoft/Windows BMP image

static int bmp_test(stbi *s)
{
   int sz;
   if (get8(s) != 'B') return 0;
   if (get8(s) != 'M') return 0;
   get32le(s); // discard filesize
   get16le(s); // discard reserved
   get16le(s); // discard reserved
   get32le(s); // discard data offset
   sz = get32le(s);
   if (sz == 12 || sz == 40 || sz == 56 || sz == 108) return 1;
   return 0;
}

#ifndef STBI_NO_STDIO
int      stbi_bmp_test_file        (FILE *f)
{
   stbi s;
   int r,n = ftell(f);
   start_file(&s,f);
   r = bmp_test(&s);
   fseek(f,n,SEEK_SET);
   return r;
}
#endif

int      stbi_bmp_test_memory      (stbi_uc const *buffer, int len)
{
   stbi s;
   start_mem(&s, buffer, len);
   return bmp_test(&s);
}

// returns 0..31 for the highest set bit
static int high_bit(unsigned int z)
{
   int n=0;
   if (z == 0) return -1;
   if (z >= 0x10000) n += 16, z >>= 16;
   if (z >= 0x00100) n +=  8, z >>=  8;
   if (z >= 0x00010) n +=  4, z >>=  4;
   if (z >= 0x00004) n +=  2, z >>=  2;
   if (z >= 0x00002) n +=  1, z >>=  1;
   return n;
}

static int bitcount(unsigned int a)
{
   a = (a & 0x55555555) + ((a >>  1) & 0x55555555); // max 2
   a = (a & 0x33333333) + ((a >>  2) & 0x33333333); // max 4
   a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
   a = (a + (a >> 8)); // max 16 per 8 bits
   a = (a + (a >> 16)); // max 32 per 8 bits
   return a & 0xff;
}

static int shiftsigned(int v, int shift, int bits)
{
   int result;
   int z=0;

   if (shift < 0) v <<= -shift;
   else v >>= shift;
   result = v;

   z = bits;
   while (z < 8) {
      result += v >> z;
      z += bits;
   }
   return result;
}

static stbi_uc *bmp_load(stbi *s, int *x, int *y, int *comp, int req_comp)
{
   uint8 *out;
   unsigned int mr=0,mg=0,mb=0,ma=0;
   stbi_uc pal[256][4];
   int psize=0,i,j,compress=0,width;
   int bpp, flip_vertically, pad, target, offset, hsz;
   if (get8(s) != 'B' || get8(s) != 'M') return epuc("not BMP", "Corrupt BMP");
   get32le(s); // discard filesize
   get16le(s); // discard reserved
   get16le(s); // discard reserved
   offset = get32le(s);
   hsz = get32le(s);
   if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) return epuc("unknown BMP", "BMP type not supported: unknown");
   failure_reason = "bad BMP";
   if (hsz == 12) {
      s->img_x = get16le(s);
      s->img_y = get16le(s);
   } else {
      s->img_x = get32le(s);
      s->img_y = get32le(s);
   }
   if (get16le(s) != 1) return 0;
   bpp = get16le(s);
   if (bpp == 1) return epuc("monochrome", "BMP type not supported: 1-bit");
   flip_vertically = ((int) s->img_y) > 0;
   s->img_y = abs((int) s->img_y);
   if (hsz == 12) {
      if (bpp < 24)
         psize = (offset - 14 - 24) / 3;
   } else {
      compress = get32le(s);
      if (compress == 1 || compress == 2) return epuc("BMP RLE", "BMP type not supported: RLE");
      get32le(s); // discard sizeof
      get32le(s); // discard hres
      get32le(s); // discard vres
      get32le(s); // discard colorsused
      get32le(s); // discard max important
      if (hsz == 40 || hsz == 56) {
         if (hsz == 56) {
            get32le(s);
            get32le(s);
            get32le(s);
            get32le(s);
         }
         if (bpp == 16 || bpp == 32) {
            mr = mg = mb = 0;
            if (compress == 0) {
               if (bpp == 32) {
                  mr = 0xff << 16;
                  mg = 0xff <<  8;
                  mb = 0xff <<  0;
               } else {
                  mr = 31 << 10;
                  mg = 31 <<  5;
                  mb = 31 <<  0;
               }
            } else if (compress == 3) {
               mr = get32le(s);
               mg = get32le(s);
               mb = get32le(s);
               // not documented, but generated by photoshop and handled by mspaint
               if (mr == mg && mg == mb) {
                  // ?!?!?
                  return NULL;
               }
            } else
               return NULL;
         }
      } else {
         assert(hsz == 108);
         mr = get32le(s);
         mg = get32le(s);
         mb = get32le(s);
         ma = get32le(s);
         get32le(s); // discard color space
         for (i=0; i < 12; ++i)
            get32le(s); // discard color space parameters
      }
      if (bpp < 16)
         psize = (offset - 14 - hsz) >> 2;
   }
   s->img_n = ma ? 4 : 3;
   if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
      target = req_comp;
   else
      target = s->img_n; // if they want monochrome, we'll post-convert
   out = (stbi_uc *) malloc(target * s->img_x * s->img_y);
   if (!out) return epuc("outofmem", "Out of memory");
   if (bpp < 16) {
      int z=0;
      if (psize == 0 || psize > 256) { free(out); return epuc("invalid", "Corrupt BMP"); }
      for (i=0; i < psize; ++i) {
         pal[i][2] = get8(s);
         pal[i][1] = get8(s);
         pal[i][0] = get8(s);
         if (hsz != 12) get8(s);
         pal[i][3] = 255;
      }
      skip(s, offset - 14 - hsz - psize * (hsz == 12 ? 3 : 4));
      if (bpp == 4) width = (s->img_x + 1) >> 1;
      else if (bpp == 8) width = s->img_x;
      else { free(out); return epuc("bad bpp", "Corrupt BMP"); }
      pad = (-width)&3;
      for (j=0; j < (int) s->img_y; ++j) {
         for (i=0; i < (int) s->img_x; i += 2) {
            int v=get8(s),v2=0;
            if (bpp == 4) {
               v2 = v & 15;
               v >>= 4;
            }
            out[z++] = pal[v][0];
            out[z++] = pal[v][1];
            out[z++] = pal[v][2];
            if (target == 4) out[z++] = 255;
            if (i+1 == (int) s->img_x) break;
            v = (bpp == 8) ? get8(s) : v2;
            out[z++] = pal[v][0];
            out[z++] = pal[v][1];
            out[z++] = pal[v][2];
            if (target == 4) out[z++] = 255;
         }
         skip(s, pad);
      }
   } else {
      int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0;
      int z = 0;
      int easy=0;
      skip(s, offset - 14 - hsz);
      if (bpp == 24) width = 3 * s->img_x;
      else if (bpp == 16) width = 2*s->img_x;
      else /* bpp = 32 and pad = 0 */ width=0;
      pad = (-width) & 3;
      if (bpp == 24) {
         easy = 1;
      } else if (bpp == 32) {
         if (mb == 0xff && mg == 0xff00 && mr == 0xff000000 && ma == 0xff000000)
            easy = 2;
      }
      if (!easy) {
         if (!mr || !mg || !mb) return epuc("bad masks", "Corrupt BMP");
         // right shift amt to put high bit in position #7
         rshift = high_bit(mr)-7; rcount = bitcount(mr);
         gshift = high_bit(mg)-7; gcount = bitcount(mr);
         bshift = high_bit(mb)-7; bcount = bitcount(mr);
         ashift = high_bit(ma)-7; acount = bitcount(mr);
      }
      for (j=0; j < (int) s->img_y; ++j) {
         if (easy) {
            for (i=0; i < (int) s->img_x; ++i) {
               int a;
               out[z+2] = get8(s);
               out[z+1] = get8(s);
               out[z+0] = get8(s);
               z += 3;
               a = (easy == 2 ? get8(s) : 255);
               if (target == 4) out[z++] = a;
            }
         } else {
            for (i=0; i < (int) s->img_x; ++i) {
               uint32 v = (bpp == 16 ? get16le(s) : get32le(s));
               int a;
               out[z++] = shiftsigned(v & mr, rshift, rcount);
               out[z++] = shiftsigned(v & mg, gshift, gcount);
               out[z++] = shiftsigned(v & mb, bshift, bcount);
               a = (ma ? shiftsigned(v & ma, ashift, acount) : 255);
               if (target == 4) out[z++] = a;
            }
         }
         skip(s, pad);
      }
   }
   if (flip_vertically) {
      stbi_uc t;
      for (j=0; j < (int) s->img_y>>1; ++j) {
         stbi_uc *p1 = out +      j     *s->img_x*target;
         stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target;
         for (i=0; i < (int) s->img_x*target; ++i) {
            t = p1[i], p1[i] = p2[i], p2[i] = t;
         }
      }
   }

   if (req_comp && req_comp != target) {
      out = convert_format(out, target, req_comp, s->img_x, s->img_y);
      if (out == NULL) return out; // convert_format frees input on failure
   }

   *x = s->img_x;
   *y = s->img_y;
   if (comp) *comp = target;
   return out;
}

#ifndef STBI_NO_STDIO
stbi_uc *stbi_bmp_load             (char const *filename,           int *x, int *y, int *comp, int req_comp)
{
   stbi_uc *data;
   FILE *f = fopen(filename, "rb");
   if (!f) return NULL;
   data = stbi_bmp_load_from_file(f, x,y,comp,req_comp);
   fclose(f);
   return data;
}

stbi_uc *stbi_bmp_load_from_file   (FILE *f,                  int *x, int *y, int *comp, int req_comp)
{
   stbi s;
   start_file(&s, f);
   return bmp_load(&s, x,y,comp,req_comp);
}
#endif

stbi_uc *stbi_bmp_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
   stbi s;
   start_mem(&s, buffer, len);
   return bmp_load(&s, x,y,comp,req_comp);
}

// Targa Truevision - TGA
// by Jonathan Dummer

static int tga_test(stbi *s)
{
	int sz;
	get8u(s);		//	discard Offset
	sz = get8u(s);	//	color type
	if( sz > 1 ) return 0;	//	only RGB or indexed allowed
	sz = get8u(s);	//	image type
	if( (sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11) ) return 0;	//	only RGB or grey allowed, +/- RLE
	get16(s);		//	discard palette start
	get16(s);		//	discard palette length
	get8(s);			//	discard bits per palette color entry
	get16(s);		//	discard x origin
	get16(s);		//	discard y origin
	if( get16(s) < 1 ) return 0;		//	test width
	if( get16(s) < 1 ) return 0;		//	test height
	sz = get8(s);	//	bits per pixel
	if( (sz != 8) && (sz != 16) && (sz != 24) && (sz != 32) ) return 0;	//	only RGB or RGBA or grey allowed
	return 1;		//	seems to have passed everything
}

#ifndef STBI_NO_STDIO
int      stbi_tga_test_file        (FILE *f)
{
   stbi s;
   int r,n = ftell(f);
   start_file(&s, f);
   r = tga_test(&s);
   fseek(f,n,SEEK_SET);
   return r;
}
#endif

int      stbi_tga_test_memory      (stbi_uc const *buffer, int len)
{
   stbi s;
   start_mem(&s, buffer, len);
   return tga_test(&s);
}

static stbi_uc *tga_load(stbi *s, int *x, int *y, int *comp, int req_comp)
{
	//	read in the TGA header stuff
	int tga_offset = get8u(s);
	int tga_indexed = get8u(s);
	int tga_image_type = get8u(s);
	int tga_is_RLE = 0;
	int tga_palette_start = get16le(s);
	int tga_palette_len = get16le(s);
	int tga_palette_bits = get8u(s);
	int tga_x_origin = get16le(s);
	int tga_y_origin = get16le(s);
	int tga_width = get16le(s);
	int tga_height = get16le(s);
	int tga_bits_per_pixel = get8u(s);
	int tga_inverted = get8u(s);
	//	image data
	unsigned char *tga_data;
	unsigned char *tga_palette = NULL;
	int i, j;
	unsigned char raw_data[4];
	unsigned char trans_data[] = { 0,0,0,0 };
	int RLE_count = 0;
	int RLE_repeating = 0;
	int read_next_pixel = 1;
	//	do a tiny bit of precessing
	if( tga_image_type >= 8 )
	{
		tga_image_type -= 8;
		tga_is_RLE = 1;
	}
	/* int tga_alpha_bits = tga_inverted & 15; */
	tga_inverted = 1 - ((tga_inverted >> 5) & 1);

	//	error check
	if( //(tga_indexed) ||
		(tga_width < 1) || (tga_height < 1) ||
		(tga_image_type < 1) || (tga_image_type > 3) ||
		((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) &&
		(tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32))
		)
	{
		return NULL;
	}

	//	If I'm paletted, then I'll use the number of bits from the palette
	if( tga_indexed )
	{
		tga_bits_per_pixel = tga_palette_bits;
	}

	//	tga info
	*x = tga_width;
	*y = tga_height;
	if( (req_comp < 1) || (req_comp > 4) )
	{
		//	just use whatever the file was
		req_comp = tga_bits_per_pixel / 8;
		*comp = req_comp;
	} else
	{
		//	force a new number of components
		*comp = tga_bits_per_pixel/8;
	}
	tga_data = (unsigned char*)malloc( tga_width * tga_height * req_comp );

	//	skip to the data's starting position (offset usually = 0)
	skip(s, tga_offset );
	//	do I need to load a palette?
	if( tga_indexed )
	{
		//	any data to skip? (offset usually = 0)
		skip(s, tga_palette_start );
		//	load the palette
		tga_palette = (unsigned char*)malloc( tga_palette_len * tga_palette_bits / 8 );
		getn(s, tga_palette, tga_palette_len * tga_palette_bits / 8 );
	}
	//	load the data
	for( i = 0; i < tga_width * tga_height; ++i )
	{
		//	if I'm in RLE mode, do I need to get a RLE chunk?
		if( tga_is_RLE )
		{
			if( RLE_count == 0 )
			{
				//	yep, get the next byte as a RLE command
				int RLE_cmd = get8u(s);
				RLE_count = 1 + (RLE_cmd & 127);
				RLE_repeating = RLE_cmd >> 7;
				read_next_pixel = 1;
			} else if( !RLE_repeating )
			{
				read_next_pixel = 1;
			}
		} else
		{
			read_next_pixel = 1;
		}
		//	OK, if I need to read a pixel, do it now
		if( read_next_pixel )
		{
			//	load however much data we did have
			if( tga_indexed )
			{
				//	read in 1 byte, then perform the lookup
				int pal_idx = get8u(s);
				if( pal_idx >= tga_palette_len )
				{
					//	invalid index
					pal_idx = 0;
				}
				pal_idx *= tga_bits_per_pixel / 8;
				for( j = 0; j*8 < tga_bits_per_pixel; ++j )
				{
					raw_data[j] = tga_palette[pal_idx+j];
				}
			} else
			{
				//	read in the data raw
				for( j = 0; j*8 < tga_bits_per_pixel; ++j )
				{
					raw_data[j] = get8u(s);
				}
			}
			//	convert raw to the intermediate format
			switch( tga_bits_per_pixel )
			{
			case 8:
				//	Luminous => RGBA
				trans_data[0] = raw_data[0];
				trans_data[1] = raw_data[0];
				trans_data[2] = raw_data[0];
				trans_data[3] = 255;
				break;
			case 16:
				//	Luminous,Alpha => RGBA
				trans_data[0] = raw_data[0];
				trans_data[1] = raw_data[0];
				trans_data[2] = raw_data[0];
				trans_data[3] = raw_data[1];
				break;
			case 24:
				//	BGR => RGBA
				trans_data[0] = raw_data[2];
				trans_data[1] = raw_data[1];
				trans_data[2] = raw_data[0];
				trans_data[3] = 255;
				break;
			case 32:
				//	BGRA => RGBA
				trans_data[0] = raw_data[2];
				trans_data[1] = raw_data[1];
				trans_data[2] = raw_data[0];
				trans_data[3] = raw_data[3];
				break;
			}
			//	clear the reading flag for the next pixel
			read_next_pixel = 0;
		} // end of reading a pixel
		//	convert to final format
		switch( req_comp )
		{
		case 1:
			//	RGBA => Luminance
			tga_data[i*req_comp+0] = compute_y(trans_data[0],trans_data[1],trans_data[2]);
			break;
		case 2:
			//	RGBA => Luminance,Alpha
			tga_data[i*req_comp+0] = compute_y(trans_data[0],trans_data[1],trans_data[2]);
			tga_data[i*req_comp+1] = trans_data[3];
			break;
		case 3:
			//	RGBA => RGB
			tga_data[i*req_comp+0] = trans_data[0];
			tga_data[i*req_comp+1] = trans_data[1];
			tga_data[i*req_comp+2] = trans_data[2];
			break;
		case 4:
			//	RGBA => RGBA
			tga_data[i*req_comp+0] = trans_data[0];
			tga_data[i*req_comp+1] = trans_data[1];
			tga_data[i*req_comp+2] = trans_data[2];
			tga_data[i*req_comp+3] = trans_data[3];
			break;
		}
		//	in case we're in RLE mode, keep counting down
		--RLE_count;
	}
	//	do I need to invert the image?
	if( tga_inverted )
	{
		for( j = 0; j*2 < tga_height; ++j )
		{
			int index1 = j * tga_width * req_comp;
			int index2 = (tga_height - 1 - j) * tga_width * req_comp;
			for( i = tga_width * req_comp; i > 0; --i )
			{
				unsigned char temp = tga_data[index1];
				tga_data[index1] = tga_data[index2];
				tga_data[index2] = temp;
				++index1;
				++index2;
			}
		}
	}
	//	clear my palette, if I had one
	if( tga_palette != NULL )
	{
		free( tga_palette );
	}
	//	the things I do to get rid of an error message, and yet keep
	//	Microsoft's C compilers happy... [8^(
	tga_palette_start = tga_palette_len = tga_palette_bits =
			tga_x_origin = tga_y_origin = 0;
	//	OK, done
	return tga_data;
}

#ifndef STBI_NO_STDIO
stbi_uc *stbi_tga_load             (char const *filename,           int *x, int *y, int *comp, int req_comp)
{
   stbi_uc *data;
   FILE *f = fopen(filename, "rb");
   if (!f) return NULL;
   data = stbi_tga_load_from_file(f, x,y,comp,req_comp);
   fclose(f);
   return data;
}

stbi_uc *stbi_tga_load_from_file   (FILE *f,                  int *x, int *y, int *comp, int req_comp)
{
   stbi s;
   start_file(&s, f);
   return tga_load(&s, x,y,comp,req_comp);
}
#endif

stbi_uc *stbi_tga_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
   stbi s;
   start_mem(&s, buffer, len);
   return tga_load(&s, x,y,comp,req_comp);
}


// *************************************************************************************************
// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicholas Schulz, tweaked by STB

static int psd_test(stbi *s)
{
	if (get32(s) != 0x38425053) return 0;	// "8BPS"
	else return 1;
}

#ifndef STBI_NO_STDIO
int stbi_psd_test_file(FILE *f)
{
   stbi s;
   int r,n = ftell(f);
   start_file(&s, f);
   r = psd_test(&s);
   fseek(f,n,SEEK_SET);
   return r;
}
#endif

int stbi_psd_test_memory(stbi_uc const *buffer, int len)
{
   stbi s;
   start_mem(&s, buffer, len);
   return psd_test(&s);
}

static stbi_uc *psd_load(stbi *s, int *x, int *y, int *comp, int req_comp)
{
	int	pixelCount;
	int channelCount, compression;
	int channel, i, count, len;
   int w,h;
   uint8 *out;

	// Check identifier
	if (get32(s) != 0x38425053)	// "8BPS"
		return epuc("not PSD", "Corrupt PSD image");

	// Check file type version.
	if (get16(s) != 1)
		return epuc("wrong version", "Unsupported version of PSD image");

	// Skip 6 reserved bytes.
	skip(s, 6 );

	// Read the number of channels (R, G, B, A, etc).
	channelCount = get16(s);
	if (channelCount < 0 || channelCount > 16)
		return epuc("wrong channel count", "Unsupported number of channels in PSD image");

	// Read the rows and columns of the image.
   h = get32(s);
   w = get32(s);

	// Make sure the depth is 8 bits.
	if (get16(s) != 8)
		return epuc("unsupported bit depth", "PSD bit depth is not 8 bit");

	// Make sure the color mode is RGB.
	// Valid options are:
	//   0: Bitmap
	//   1: Grayscale
	//   2: Indexed color
	//   3: RGB color
	//   4: CMYK color
	//   7: Multichannel
	//   8: Duotone
	//   9: Lab color
	if (get16(s) != 3)
		return epuc("wrong color format", "PSD is not in RGB color format");

	// Skip the Mode Data.  (It's the palette for indexed color; other info for other modes.)
	skip(s,get32(s) );

	// Skip the image resources.  (resolution, pen tool paths, etc)
	skip(s, get32(s) );

	// Skip the reserved data.
	skip(s, get32(s) );

	// Find out if the data is compressed.
	// Known values:
	//   0: no compression
	//   1: RLE compressed
	compression = get16(s);
	if (compression > 1)
		return epuc("bad compression", "PSD has an unknown compression format");

	// Create the destination image.
	out = (stbi_uc *) malloc(4 * w*h);
	if (!out) return epuc("outofmem", "Out of memory");
   pixelCount = w*h;

	// Initialize the data to zero.
	//memset( out, 0, pixelCount * 4 );

	// Finally, the image data.
	if (compression) {
		// RLE as used by .PSD and .TIFF
		// Loop until you get the number of unpacked bytes you are expecting:
		//     Read the next source byte into n.
		//     If n is between 0 and 127 inclusive, copy the next n+1 bytes literally.
		//     Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times.
		//     Else if n is 128, noop.
		// Endloop

		// The RLE-compressed data is preceeded by a 2-byte data count for each row in the data,
		// which we're going to just skip.
		skip(s, h * channelCount * 2 );

		// Read the RLE data by channel.
		for (channel = 0; channel < 4; channel++) {
			uint8 *p;

         p = out+channel;
			if (channel >= channelCount) {
				// Fill this channel with default data.
				for (i = 0; i < pixelCount; i++) *p = (channel == 3 ? 255 : 0), p += 4;
			} else {
				// Read the RLE data.
				count = 0;
				while (count < pixelCount) {
					len = get8(s);
					if (len == 128) {
						// No-op.
					} else if (len < 128) {
						// Copy next len+1 bytes literally.
						len++;
						count += len;
						while (len) {
							*p = get8(s);
                     p += 4;
							len--;
						}
					} else if (len > 128) {
						uint32	val;
						// Next -len+1 bytes in the dest are replicated from next source byte.
						// (Interpret len as a negative 8-bit int.)
						len ^= 0x0FF;
						len += 2;
                  val = get8(s);
						count += len;
						while (len) {
							*p = val;
                     p += 4;
							len--;
						}
					}
				}
			}
		}

	} else {
		// We're at the raw image data.  It's each channel in order (Red, Green, Blue, Alpha, ...)
		// where each channel consists of an 8-bit value for each pixel in the image.

		// Read the data by channel.
		for (channel = 0; channel < 4; channel++) {
			uint8 *p;

         p = out + channel;
			if (channel > channelCount) {
				// Fill this channel with default data.
				for (i = 0; i < pixelCount; i++) *p = channel == 3 ? 255 : 0, p += 4;
			} else {
				// Read the data.
				count = 0;
				for (i = 0; i < pixelCount; i++)
					*p = get8(s), p += 4;
			}
		}
	}

	if (req_comp && req_comp != 4) {
		out = convert_format(out, 4, req_comp, w, h);
		if (out == NULL) return out; // convert_format frees input on failure
	}

	if (comp) *comp = channelCount;
	*y = h;
	*x = w;

	return out;
}

#ifndef STBI_NO_STDIO
stbi_uc *stbi_psd_load(char const *filename, int *x, int *y, int *comp, int req_comp)
{
   stbi_uc *data;
   FILE *f = fopen(filename, "rb");
   if (!f) return NULL;
   data = stbi_psd_load_from_file(f, x,y,comp,req_comp);
   fclose(f);
   return data;
}

stbi_uc *stbi_psd_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
{
   stbi s;
   start_file(&s, f);
   return psd_load(&s, x,y,comp,req_comp);
}
#endif

stbi_uc *stbi_psd_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
   stbi s;
   start_mem(&s, buffer, len);
   return psd_load(&s, x,y,comp,req_comp);
}


// *************************************************************************************************
// Radiance RGBE HDR loader
// originally by Nicolas Schulz
#ifndef STBI_NO_HDR
static int hdr_test(stbi *s)
{
   char *signature = "#?RADIANCE\n";
   int i;
   for (i=0; signature[i]; ++i)
      if (get8(s) != signature[i])
         return 0;
	return 1;
}

int stbi_hdr_test_memory(stbi_uc const *buffer, int len)
{
   stbi s;
	start_mem(&s, buffer, len);
	return hdr_test(&s);
}

#ifndef STBI_NO_STDIO
int stbi_hdr_test_file(FILE *f)
{
   stbi s;
   int r,n = ftell(f);
   start_file(&s, f);
   r = hdr_test(&s);
   fseek(f,n,SEEK_SET);
   return r;
}
#endif

#define HDR_BUFLEN  1024
static char *hdr_gettoken(stbi *z, char *buffer)
{
   int len=0;
	//char *s = buffer,
	char c = '\0';

   c = get8(z);

	while (!at_eof(z) && c != '\n') {
		buffer[len++] = c;
      if (len == HDR_BUFLEN-1) {
         // flush to end of line
         while (!at_eof(z) && get8(z) != '\n')
            ;
         break;
      }
      c = get8(z);
	}

   buffer[len] = 0;
	return buffer;
}

static void hdr_convert(float *output, stbi_uc *input, int req_comp)
{
	if( input[3] != 0 ) {
      float f1;
		// Exponent
		f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8));
      if (req_comp <= 2)
         output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
      else {
         output[0] = input[0] * f1;
         output[1] = input[1] * f1;
         output[2] = input[2] * f1;
      }
      if (req_comp == 2) output[1] = 1;
      if (req_comp == 4) output[3] = 1;
	} else {
      switch (req_comp) {
         case 4: output[3] = 1; /* fallthrough */
         case 3: output[0] = output[1] = output[2] = 0;
                 break;
         case 2: output[1] = 1; /* fallthrough */
         case 1: output[0] = 0;
                 break;
      }
	}
}


static float *hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp)
{
   char buffer[HDR_BUFLEN];
	char *token;
	int valid = 0;
	int width, height;
   stbi_uc *scanline;
	float *hdr_data;
	int len;
	unsigned char count, value;
	int i, j, k, c1,c2, z;


	// Check identifier
	if (strcmp(hdr_gettoken(s,buffer), "#?RADIANCE") != 0)
		return epf("not HDR", "Corrupt HDR image");

	// Parse header
	while(1) {
		token = hdr_gettoken(s,buffer);
      if (token[0] == 0) break;
		if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
   }

	if (!valid)    return epf("unsupported format", "Unsupported HDR format");

   // Parse width and height
   // can't use sscanf() if we're not using stdio!
   token = hdr_gettoken(s,buffer);
   if (strncmp(token, "-Y ", 3))  return epf("unsupported data layout", "Unsupported HDR format");
   token += 3;
   height = strtol(token, &token, 10);
   while (*token == ' ') ++token;
   if (strncmp(token, "+X ", 3))  return epf("unsupported data layout", "Unsupported HDR format");
   token += 3;
   width = strtol(token, NULL, 10);

	*x = width;
	*y = height;

   *comp = 3;
	if (req_comp == 0) req_comp = 3;

	// Read data
	hdr_data = (float *) malloc(height * width * req_comp * sizeof(float));

	// Load image data
   // image data is stored as some number of sca
	if( width < 8 || width >= 32768) {
		// Read flat data
      for (j=0; j < height; ++j) {
         for (i=0; i < width; ++i) {
            stbi_uc rgbe[4];
           main_decode_loop:
            getn(s, rgbe, 4);
            hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
         }
      }
	} else {
		// Read RLE-encoded data
		scanline = NULL;

		for (j = 0; j < height; ++j) {
         c1 = get8(s);
         c2 = get8(s);
         len = get8(s);
         if (c1 != 2 || c2 != 2 || (len & 0x80)) {
            // not run-length encoded, so we have to actually use THIS data as a decoded
            // pixel (note this can't be a valid pixel--one of RGB must be >= 128)
            stbi_uc rgbe[4] = { c1,c2,len, get8(s) };
            hdr_convert(hdr_data, rgbe, req_comp);
            i = 1;
            j = 0;
            free(scanline);
            goto main_decode_loop; // yes, this is fucking insane; blame the fucking insane format
         }
         len <<= 8;
         len |= get8(s);
         if (len != width) { free(hdr_data); free(scanline); return epf("invalid decoded scanline length", "corrupt HDR"); }
         if (scanline == NULL) scanline = (stbi_uc *) malloc(width * 4);

			for (k = 0; k < 4; ++k) {
				i = 0;
				while (i < width) {
					count = get8(s);
					if (count > 128) {
						// Run
						value = get8(s);
                  count -= 128;
						for (z = 0; z < count; ++z)
							scanline[i++ * 4 + k] = value;
					} else {
						// Dump
						for (z = 0; z < count; ++z)
							scanline[i++ * 4 + k] = get8(s);
					}
				}
			}
         for (i=0; i < width; ++i)
            hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp);
		}
      free(scanline);
	}

   return hdr_data;
}

static stbi_uc *hdr_load_rgbe(stbi *s, int *x, int *y, int *comp, int req_comp)
{
   char buffer[HDR_BUFLEN];
	char *token;
	int valid = 0;
	int width, height;
   stbi_uc *scanline;
	stbi_uc *rgbe_data;
	int len;
	unsigned char count, value;
	int i, j, k, c1,c2, z;


	// Check identifier
	if (strcmp(hdr_gettoken(s,buffer), "#?RADIANCE") != 0)
		return epuc("not HDR", "Corrupt HDR image");

	// Parse header
	while(1) {
		token = hdr_gettoken(s,buffer);
      if (token[0] == 0) break;
		if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
   }

	if (!valid)    return epuc("unsupported format", "Unsupported HDR format");

   // Parse width and height
   // can't use sscanf() if we're not using stdio!
   token = hdr_gettoken(s,buffer);
   if (strncmp(token, "-Y ", 3))  return epuc("unsupported data layout", "Unsupported HDR format");
   token += 3;
   height = strtol(token, &token, 10);
   while (*token == ' ') ++token;
   if (strncmp(token, "+X ", 3))  return epuc("unsupported data layout", "Unsupported HDR format");
   token += 3;
   width = strtol(token, NULL, 10);

	*x = width;
	*y = height;

	// RGBE _MUST_ come out as 4 components
   *comp = 4;
	req_comp = 4;

	// Read data
	rgbe_data = (stbi_uc *) malloc(height * width * req_comp * sizeof(stbi_uc));
	//	point to the beginning
	scanline = rgbe_data;

	// Load image data
   // image data is stored as some number of scan lines
	if( width < 8 || width >= 32768) {
		// Read flat data
      for (j=0; j < height; ++j) {
         for (i=0; i < width; ++i) {
           main_decode_loop:
            //getn(rgbe, 4);
            getn(s,scanline, 4);
			scanline += 4;
         }
      }
	} else {
		// Read RLE-encoded data
		for (j = 0; j < height; ++j) {
         c1 = get8(s);
         c2 = get8(s);
         len = get8(s);
         if (c1 != 2 || c2 != 2 || (len & 0x80)) {
            // not run-length encoded, so we have to actually use THIS data as a decoded
            // pixel (note this can't be a valid pixel--one of RGB must be >= 128)
            scanline[0] = c1;
            scanline[1] = c2;
            scanline[2] = len;
            scanline[3] = get8(s);
            scanline += 4;
            i = 1;
            j = 0;
            goto main_decode_loop; // yes, this is insane; blame the insane format
         }
         len <<= 8;
         len |= get8(s);
         if (len != width) { free(rgbe_data); return epuc("invalid decoded scanline length", "corrupt HDR"); }
			for (k = 0; k < 4; ++k) {
				i = 0;
				while (i < width) {
					count = get8(s);
					if (count > 128) {
						// Run
						value = get8(s);
                  count -= 128;
						for (z = 0; z < count; ++z)
							scanline[i++ * 4 + k] = value;
					} else {
						// Dump
						for (z = 0; z < count; ++z)
							scanline[i++ * 4 + k] = get8(s);
					}
				}
			}
			//	move the scanline on
			scanline += 4 * width;
		}
	}

   return rgbe_data;
}

#ifndef STBI_NO_STDIO
float *stbi_hdr_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
{
   stbi s;
   start_file(&s,f);
   return hdr_load(&s,x,y,comp,req_comp);
}

stbi_uc *stbi_hdr_load_rgbe_file(FILE *f, int *x, int *y, int *comp, int req_comp)
{
   stbi s;
   start_file(&s,f);
   return hdr_load_rgbe(&s,x,y,comp,req_comp);
}

stbi_uc *stbi_hdr_load_rgbe        (char const *filename,           int *x, int *y, int *comp, int req_comp)
{
   FILE *f = fopen(filename, "rb");
   unsigned char *result;
   if (!f) return epuc("can't fopen", "Unable to open file");
   result = stbi_hdr_load_rgbe_file(f,x,y,comp,req_comp);
   fclose(f);
   return result;
}
#endif

float *stbi_hdr_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
   stbi s;
   start_mem(&s,buffer, len);
   return hdr_load(&s,x,y,comp,req_comp);
}

stbi_uc *stbi_hdr_load_rgbe_memory(stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
   stbi s;
   start_mem(&s,buffer, len);
   return hdr_load_rgbe(&s,x,y,comp,req_comp);
}

#endif // STBI_NO_HDR

/////////////////////// write image ///////////////////////

#ifndef STBI_NO_WRITE

static void write8(FILE *f, int x) { uint8 z = (uint8) x; fwrite(&z,1,1,f); }

static void writefv(FILE *f, char *fmt, va_list v)
{
   while (*fmt) {
      switch (*fmt++) {
         case ' ': break;
         case '1': { uint8 x = va_arg(v, int); write8(f,x); break; }
         case '2': { int16 x = va_arg(v, int); write8(f,x); write8(f,x>>8); break; }
         case '4': { int32 x = va_arg(v, int); write8(f,x); write8(f,x>>8); write8(f,x>>16); write8(f,x>>24); break; }
         default:
            assert(0);
            va_end(v);
            return;
      }
   }
}

static void writef(FILE *f, char *fmt, ...)
{
   va_list v;
   va_start(v, fmt);
   writefv(f,fmt,v);
   va_end(v);
}

static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad)
{
   uint8 bg[3] = { 255, 0, 255}, px[3];
   uint32 zero = 0;
   int i,j,k, j_end;

   if (vdir < 0)
      j_end = -1, j = y-1;
   else
      j_end =  y, j = 0;

   for (; j != j_end; j += vdir) {
      for (i=0; i < x; ++i) {
         uint8 *d = (uint8 *) data + (j*x+i)*comp;
         if (write_alpha < 0)
            fwrite(&d[comp-1], 1, 1, f);
         switch (comp) {
            case 1:
            case 2: writef(f, "111", d[0],d[0],d[0]);
                    break;
            case 4:
               if (!write_alpha) {
                  for (k=0; k < 3; ++k)
                     px[k] = bg[k] + ((d[k] - bg[k]) * d[3])/255;
                  writef(f, "111", px[1-rgb_dir],px[1],px[1+rgb_dir]);
                  break;
               }
               /* FALLTHROUGH */
            case 3:
               writef(f, "111", d[1-rgb_dir],d[1],d[1+rgb_dir]);
               break;
         }
         if (write_alpha > 0)
            fwrite(&d[comp-1], 1, 1, f);
      }
      fwrite(&zero,scanline_pad,1,f);
   }
}

static int outfile(char const *filename, int rgb_dir, int vdir, int x, int y, int comp, void *data, int alpha, int pad, char *fmt, ...)
{
   FILE *f = fopen(filename, "wb");
   if (f) {
      va_list v;
      va_start(v, fmt);
      writefv(f, fmt, v);
      va_end(v);
      write_pixels(f,rgb_dir,vdir,x,y,comp,data,alpha,pad);
      fclose(f);
   }
   return f != NULL;
}

int stbi_write_bmp(char const *filename, int x, int y, int comp, void *data)
{
   int pad = (-x*3) & 3;
   return outfile(filename,-1,-1,x,y,comp,data,0,pad,
           "11 4 22 4" "4 44 22 444444",
           'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40,  // file header
            40, x,y, 1,24, 0,0,0,0,0,0);             // bitmap header
}

int stbi_write_tga(char const *filename, int x, int y, int comp, void *data)
{
   int has_alpha = !(comp & 1);
   return outfile(filename, -1,-1, x, y, comp, data, has_alpha, 0,
                  "111 221 2222 11", 0,0,2, 0,0,0, 0,0,x,y, 24+8*has_alpha, 8*has_alpha);
}

// any other image formats that do interleaved rgb data?
//    PNG: requires adler32,crc32 -- significant amount of code
//    PSD: no, channels output separately
//    TIFF: no, stripwise-interleaved... i think

#endif // STBI_NO_WRITE

//	add in my DDS loading support
#ifndef STBI_NO_DDS
#include "stbi_DDS_aug_c.h"
#endif

Added ext/soil/stb_image_aug.h.





































































































































































































































































































































































































































































































































































































































































































































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/* stbi-1.16 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c
                      when you control the images you're loading

   QUICK NOTES:
      Primarily of interest to game developers and other people who can
          avoid problematic images and only need the trivial interface

      JPEG baseline (no JPEG progressive, no oddball channel decimations)
      PNG non-interlaced
      BMP non-1bpp, non-RLE
      TGA (not sure what subset, if a subset)
      PSD (composited view only, no extra channels)
      HDR (radiance rgbE format)
      writes BMP,TGA (define STBI_NO_WRITE to remove code)
      decoded from memory or through stdio FILE (define STBI_NO_STDIO to remove code)
      supports installable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD)
        
   TODO:
      stbi_info_*
  
   history:
      1.16   major bugfix - convert_format converted one too many pixels
      1.15   initialize some fields for thread safety
      1.14   fix threadsafe conversion bug; header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
      1.13   threadsafe
      1.12   const qualifiers in the API
      1.11   Support installable IDCT, colorspace conversion routines
      1.10   Fixes for 64-bit (don't use "unsigned long")
             optimized upsampling by Fabian "ryg" Giesen
      1.09   Fix format-conversion for PSD code (bad global variables!)
      1.08   Thatcher Ulrich's PSD code integrated by Nicolas Schulz
      1.07   attempt to fix C++ warning/errors again
      1.06   attempt to fix C++ warning/errors again
      1.05   fix TGA loading to return correct *comp and use good luminance calc
      1.04   default float alpha is 1, not 255; use 'void *' for stbi_image_free
      1.03   bugfixes to STBI_NO_STDIO, STBI_NO_HDR
      1.02   support for (subset of) HDR files, float interface for preferred access to them
      1.01   fix bug: possible bug in handling right-side up bmps... not sure
             fix bug: the stbi_bmp_load() and stbi_tga_load() functions didn't work at all
      1.00   interface to zlib that skips zlib header
      0.99   correct handling of alpha in palette
      0.98   TGA loader by lonesock; dynamically add loaders (untested)
      0.97   jpeg errors on too large a file; also catch another malloc failure
      0.96   fix detection of invalid v value - particleman@mollyrocket forum
      0.95   during header scan, seek to markers in case of padding
      0.94   STBI_NO_STDIO to disable stdio usage; rename all #defines the same
      0.93   handle jpegtran output; verbose errors
      0.92   read 4,8,16,24,32-bit BMP files of several formats
      0.91   output 24-bit Windows 3.0 BMP files
      0.90   fix a few more warnings; bump version number to approach 1.0
      0.61   bugfixes due to Marc LeBlanc, Christopher Lloyd
      0.60   fix compiling as c++
      0.59   fix warnings: merge Dave Moore's -Wall fixes
      0.58   fix bug: zlib uncompressed mode len/nlen was wrong endian
      0.57   fix bug: jpg last huffman symbol before marker was >9 bits but less
                      than 16 available
      0.56   fix bug: zlib uncompressed mode len vs. nlen
      0.55   fix bug: restart_interval not initialized to 0
      0.54   allow NULL for 'int *comp'
      0.53   fix bug in png 3->4; speedup png decoding
      0.52   png handles req_comp=3,4 directly; minor cleanup; jpeg comments
      0.51   obey req_comp requests, 1-component jpegs return as 1-component,
             on 'test' only check type, not whether we support this variant
*/

#ifndef HEADER_STB_IMAGE_AUGMENTED
#define HEADER_STB_IMAGE_AUGMENTED

////   begin header file  ////////////////////////////////////////////////////
//
// Limitations:
//    - no progressive/interlaced support (jpeg, png)
//    - 8-bit samples only (jpeg, png)
//    - not threadsafe
//    - channel subsampling of at most 2 in each dimension (jpeg)
//    - no delayed line count (jpeg) -- IJG doesn't support either
//
// Basic usage (see HDR discussion below):
//    int x,y,n;
//    unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
//    // ... process data if not NULL ... 
//    // ... x = width, y = height, n = # 8-bit components per pixel ...
//    // ... replace '0' with '1'..'4' to force that many components per pixel
//    stbi_image_free(data)
//
// Standard parameters:
//    int *x       -- outputs image width in pixels
//    int *y       -- outputs image height in pixels
//    int *comp    -- outputs # of image components in image file
//    int req_comp -- if non-zero, # of image components requested in result
//
// The return value from an image loader is an 'unsigned char *' which points
// to the pixel data. The pixel data consists of *y scanlines of *x pixels,
// with each pixel consisting of N interleaved 8-bit components; the first
// pixel pointed to is top-left-most in the image. There is no padding between
// image scanlines or between pixels, regardless of format. The number of
// components N is 'req_comp' if req_comp is non-zero, or *comp otherwise.
// If req_comp is non-zero, *comp has the number of components that _would_
// have been output otherwise. E.g. if you set req_comp to 4, you will always
// get RGBA output, but you can check *comp to easily see if it's opaque.
//
// An output image with N components has the following components interleaved
// in this order in each pixel:
//
//     N=#comp     components
//       1           grey
//       2           grey, alpha
//       3           red, green, blue
//       4           red, green, blue, alpha
//
// If image loading fails for any reason, the return value will be NULL,
// and *x, *y, *comp will be unchanged. The function stbi_failure_reason()
// can be queried for an extremely brief, end-user unfriendly explanation
// of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid
// compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
// more user-friendly ones.
//
// Paletted PNG and BMP images are automatically depalettized.
//
//
// ===========================================================================
//
// HDR image support   (disable by defining STBI_NO_HDR)
//
// stb_image now supports loading HDR images in general, and currently
// the Radiance .HDR file format, although the support is provided
// generically. You can still load any file through the existing interface;
// if you attempt to load an HDR file, it will be automatically remapped to
// LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1;
// both of these constants can be reconfigured through this interface:
//
//     stbi_hdr_to_ldr_gamma(2.2f);
//     stbi_hdr_to_ldr_scale(1.0f);
//
// (note, do not use _inverse_ constants; stbi_image will invert them
// appropriately).
//
// Additionally, there is a new, parallel interface for loading files as
// (linear) floats to preserve the full dynamic range:
//
//    float *data = stbi_loadf(filename, &x, &y, &n, 0);
// 
// If you load LDR images through this interface, those images will
// be promoted to floating point values, run through the inverse of
// constants corresponding to the above:
//
//     stbi_ldr_to_hdr_scale(1.0f);
//     stbi_ldr_to_hdr_gamma(2.2f);
//
// Finally, given a filename (or an open file or memory block--see header
// file for details) containing image data, you can query for the "most
// appropriate" interface to use (that is, whether the image is HDR or
// not), using:
//
//     stbi_is_hdr(char *filename);

#ifndef STBI_NO_STDIO
#include <stdio.h>
#endif

#define STBI_VERSION 1

enum
{
   STBI_default = 0, // only used for req_comp

   STBI_grey       = 1,
   STBI_grey_alpha = 2,
   STBI_rgb        = 3,
   STBI_rgb_alpha  = 4,
};

typedef unsigned char stbi_uc;

#ifdef __cplusplus
extern "C" {
#endif

// WRITING API

#if !defined(STBI_NO_WRITE) && !defined(STBI_NO_STDIO)
// write a BMP/TGA file given tightly packed 'comp' channels (no padding, nor bmp-stride-padding)
// (you must include the appropriate extension in the filename).
// returns TRUE on success, FALSE if couldn't open file, error writing file
extern int      stbi_write_bmp       (char const *filename,     int x, int y, int comp, void *data);
extern int      stbi_write_tga       (char const *filename,     int x, int y, int comp, void *data);
#endif

// PRIMARY API - works on images of any type

// load image by filename, open file, or memory buffer
#ifndef STBI_NO_STDIO
extern stbi_uc *stbi_load            (char const *filename,     int *x, int *y, int *comp, int req_comp);
extern stbi_uc *stbi_load_from_file  (FILE *f,                  int *x, int *y, int *comp, int req_comp);
extern int      stbi_info_from_file  (FILE *f,                  int *x, int *y, int *comp);
#endif
extern stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
// for stbi_load_from_file, file pointer is left pointing immediately after image

#ifndef STBI_NO_HDR
#ifndef STBI_NO_STDIO
extern float *stbi_loadf            (char const *filename,     int *x, int *y, int *comp, int req_comp);
extern float *stbi_loadf_from_file  (FILE *f,                  int *x, int *y, int *comp, int req_comp);
#endif
extern float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);

extern void   stbi_hdr_to_ldr_gamma(float gamma);
extern void   stbi_hdr_to_ldr_scale(float scale);

extern void   stbi_ldr_to_hdr_gamma(float gamma);
extern void   stbi_ldr_to_hdr_scale(float scale);

#endif // STBI_NO_HDR

// get a VERY brief reason for failure
// NOT THREADSAFE
extern char    *stbi_failure_reason  (void); 

// free the loaded image -- this is just free()
extern void     stbi_image_free      (void *retval_from_stbi_load);

// get image dimensions & components without fully decoding
extern int      stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
extern int      stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
#ifndef STBI_NO_STDIO
extern int      stbi_info            (char const *filename,     int *x, int *y, int *comp);
extern int      stbi_is_hdr          (char const *filename);
extern int      stbi_is_hdr_from_file(FILE *f);
#endif

// ZLIB client - used by PNG, available for other purposes

extern char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
extern char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
extern int   stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);

extern char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
extern int   stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);

// TYPE-SPECIFIC ACCESS

// is it a jpeg?
extern int      stbi_jpeg_test_memory     (stbi_uc const *buffer, int len);
extern stbi_uc *stbi_jpeg_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
extern int      stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);

#ifndef STBI_NO_STDIO
extern stbi_uc *stbi_jpeg_load            (char const *filename,     int *x, int *y, int *comp, int req_comp);
extern int      stbi_jpeg_test_file       (FILE *f);
extern stbi_uc *stbi_jpeg_load_from_file  (FILE *f,                  int *x, int *y, int *comp, int req_comp);

extern int      stbi_jpeg_info            (char const *filename,     int *x, int *y, int *comp);
extern int      stbi_jpeg_info_from_file  (FILE *f,                  int *x, int *y, int *comp);
#endif

// is it a png?
extern int      stbi_png_test_memory      (stbi_uc const *buffer, int len);
extern stbi_uc *stbi_png_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
extern int      stbi_png_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp);

#ifndef STBI_NO_STDIO
extern stbi_uc *stbi_png_load             (char const *filename,     int *x, int *y, int *comp, int req_comp);
extern int      stbi_png_info             (char const *filename,     int *x, int *y, int *comp);
extern int      stbi_png_test_file        (FILE *f);
extern stbi_uc *stbi_png_load_from_file   (FILE *f,                  int *x, int *y, int *comp, int req_comp);
extern int      stbi_png_info_from_file   (FILE *f,                  int *x, int *y, int *comp);
#endif

// is it a bmp?
extern int      stbi_bmp_test_memory      (stbi_uc const *buffer, int len);

extern stbi_uc *stbi_bmp_load             (char const *filename,     int *x, int *y, int *comp, int req_comp);
extern stbi_uc *stbi_bmp_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
#ifndef STBI_NO_STDIO
extern int      stbi_bmp_test_file        (FILE *f);
extern stbi_uc *stbi_bmp_load_from_file   (FILE *f,                  int *x, int *y, int *comp, int req_comp);
#endif

// is it a tga?
extern int      stbi_tga_test_memory      (stbi_uc const *buffer, int len);

extern stbi_uc *stbi_tga_load             (char const *filename,     int *x, int *y, int *comp, int req_comp);
extern stbi_uc *stbi_tga_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
#ifndef STBI_NO_STDIO
extern int      stbi_tga_test_file        (FILE *f);
extern stbi_uc *stbi_tga_load_from_file   (FILE *f,                  int *x, int *y, int *comp, int req_comp);
#endif

// is it a psd?
extern int      stbi_psd_test_memory      (stbi_uc const *buffer, int len);

extern stbi_uc *stbi_psd_load             (char const *filename,     int *x, int *y, int *comp, int req_comp);
extern stbi_uc *stbi_psd_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
#ifndef STBI_NO_STDIO
extern int      stbi_psd_test_file        (FILE *f);
extern stbi_uc *stbi_psd_load_from_file   (FILE *f,                  int *x, int *y, int *comp, int req_comp);
#endif

// is it an hdr?
extern int      stbi_hdr_test_memory      (stbi_uc const *buffer, int len);

extern float *  stbi_hdr_load             (char const *filename,     int *x, int *y, int *comp, int req_comp);
extern float *  stbi_hdr_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
extern stbi_uc *stbi_hdr_load_rgbe        (char const *filename,           int *x, int *y, int *comp, int req_comp);
extern float *  stbi_hdr_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
#ifndef STBI_NO_STDIO
extern int      stbi_hdr_test_file        (FILE *f);
extern float *  stbi_hdr_load_from_file   (FILE *f,                  int *x, int *y, int *comp, int req_comp);
extern stbi_uc *stbi_hdr_load_rgbe_file   (FILE *f,                  int *x, int *y, int *comp, int req_comp);
#endif

// define new loaders
typedef struct
{
   int       (*test_memory)(stbi_uc const *buffer, int len);
   stbi_uc * (*load_from_memory)(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
   #ifndef STBI_NO_STDIO
   int       (*test_file)(FILE *f);
   stbi_uc * (*load_from_file)(FILE *f, int *x, int *y, int *comp, int req_comp);
   #endif
} stbi_loader;

// register a loader by filling out the above structure (you must defined ALL functions)
// returns 1 if added or already added, 0 if not added (too many loaders)
// NOT THREADSAFE
extern int stbi_register_loader(stbi_loader *loader);

// define faster low-level operations (typically SIMD support)
#if STBI_SIMD
typedef void (*stbi_idct_8x8)(uint8 *out, int out_stride, short data[64], unsigned short *dequantize);
// compute an integer IDCT on "input"
//     input[x] = data[x] * dequantize[x]
//     write results to 'out': 64 samples, each run of 8 spaced by 'out_stride'
//                             CLAMP results to 0..255
typedef void (*stbi_YCbCr_to_RGB_run)(uint8 *output, uint8 const *y, uint8 const *cb, uint8 const *cr, int count, int step);
// compute a conversion from YCbCr to RGB
//     'count' pixels
//     write pixels to 'output'; each pixel is 'step' bytes (either 3 or 4; if 4, write '255' as 4th), order R,G,B
//     y: Y input channel
//     cb: Cb input channel; scale/biased to be 0..255
//     cr: Cr input channel; scale/biased to be 0..255

extern void stbi_install_idct(stbi_idct_8x8 func);
extern void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func);
#endif // STBI_SIMD

#ifdef __cplusplus
}
#endif

//
//
////   end header file   /////////////////////////////////////////////////////
#endif // STBI_INCLUDE_STB_IMAGE_H

Added ext/soil/stbi_DDS_aug.h.











































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/*
	adding DDS loading support to stbi
*/

#ifndef HEADER_STB_IMAGE_DDS_AUGMENTATION
#define HEADER_STB_IMAGE_DDS_AUGMENTATION

//	is it a DDS file?
extern int      stbi_dds_test_memory      (stbi_uc const *buffer, int len);

extern stbi_uc *stbi_dds_load             (char *filename,           int *x, int *y, int *comp, int req_comp);
extern stbi_uc *stbi_dds_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
#ifndef STBI_NO_STDIO
extern int      stbi_dds_test_file        (FILE *f);
extern stbi_uc *stbi_dds_load_from_file   (FILE *f,                  int *x, int *y, int *comp, int req_comp);
#endif

//
//
////   end header file   /////////////////////////////////////////////////////
#endif // HEADER_STB_IMAGE_DDS_AUGMENTATION

Added ext/soil/stbi_DDS_aug_c.h.































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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///	DDS file support, does decoding, _not_ direct uploading
///	(use SOIL for that ;-)

///	A bunch of DirectDraw Surface structures and flags
typedef struct {
    unsigned int    dwMagic;
    unsigned int    dwSize;
    unsigned int    dwFlags;
    unsigned int    dwHeight;
    unsigned int    dwWidth;
    unsigned int    dwPitchOrLinearSize;
    unsigned int    dwDepth;
    unsigned int    dwMipMapCount;
    unsigned int    dwReserved1[ 11 ];

    //  DDPIXELFORMAT
    struct {
      unsigned int    dwSize;
      unsigned int    dwFlags;
      unsigned int    dwFourCC;
      unsigned int    dwRGBBitCount;
      unsigned int    dwRBitMask;
      unsigned int    dwGBitMask;
      unsigned int    dwBBitMask;
      unsigned int    dwAlphaBitMask;
    }               sPixelFormat;

    //  DDCAPS2
    struct {
      unsigned int    dwCaps1;
      unsigned int    dwCaps2;
      unsigned int    dwDDSX;
      unsigned int    dwReserved;
    }               sCaps;
    unsigned int    dwReserved2;
} DDS_header ;

//	the following constants were copied directly off the MSDN website

//	The dwFlags member of the original DDSURFACEDESC2 structure
//	can be set to one or more of the following values.
#define DDSD_CAPS	0x00000001
#define DDSD_HEIGHT	0x00000002
#define DDSD_WIDTH	0x00000004
#define DDSD_PITCH	0x00000008
#define DDSD_PIXELFORMAT	0x00001000
#define DDSD_MIPMAPCOUNT	0x00020000
#define DDSD_LINEARSIZE	0x00080000
#define DDSD_DEPTH	0x00800000

//	DirectDraw Pixel Format
#define DDPF_ALPHAPIXELS	0x00000001
#define DDPF_FOURCC	0x00000004
#define DDPF_RGB	0x00000040

//	The dwCaps1 member of the DDSCAPS2 structure can be
//	set to one or more of the following values.
#define DDSCAPS_COMPLEX	0x00000008
#define DDSCAPS_TEXTURE	0x00001000
#define DDSCAPS_MIPMAP	0x00400000

//	The dwCaps2 member of the DDSCAPS2 structure can be
//	set to one or more of the following values.
#define DDSCAPS2_CUBEMAP	0x00000200
#define DDSCAPS2_CUBEMAP_POSITIVEX	0x00000400
#define DDSCAPS2_CUBEMAP_NEGATIVEX	0x00000800
#define DDSCAPS2_CUBEMAP_POSITIVEY	0x00001000
#define DDSCAPS2_CUBEMAP_NEGATIVEY	0x00002000
#define DDSCAPS2_CUBEMAP_POSITIVEZ	0x00004000
#define DDSCAPS2_CUBEMAP_NEGATIVEZ	0x00008000
#define DDSCAPS2_VOLUME	0x00200000

static int dds_test(stbi *s)
{
	//	check the magic number
	if (get8(s) != 'D') return 0;
	if (get8(s) != 'D') return 0;
	if (get8(s) != 'S') return 0;
	if (get8(s) != ' ') return 0;
	//	check header size
	if (get32le(s) != 124) return 0;
	return 1;
}
#ifndef STBI_NO_STDIO
int      stbi_dds_test_file        (FILE *f)
{
   stbi s;
   int r,n = ftell(f);
   start_file(&s,f);
   r = dds_test(&s);
   fseek(f,n,SEEK_SET);
   return r;
}
#endif

int      stbi_dds_test_memory      (stbi_uc const *buffer, int len)
{
   stbi s;
   start_mem(&s,buffer, len);
   return dds_test(&s);
}

//	helper functions
int stbi_convert_bit_range( int c, int from_bits, int to_bits )
{
	int b = (1 << (from_bits - 1)) + c * ((1 << to_bits) - 1);
	return (b + (b >> from_bits)) >> from_bits;
}
void stbi_rgb_888_from_565( unsigned int c, int *r, int *g, int *b )
{
	*r = stbi_convert_bit_range( (c >> 11) & 31, 5, 8 );
	*g = stbi_convert_bit_range( (c >> 05) & 63, 6, 8 );
	*b = stbi_convert_bit_range( (c >> 00) & 31, 5, 8 );
}
void stbi_decode_DXT1_block(
			unsigned char uncompressed[16*4],
			unsigned char compressed[8] )
{
	int next_bit = 4*8;
	int i, r, g, b;
	int c0, c1;
	unsigned char decode_colors[4*4];
	//	find the 2 primary colors
	c0 = compressed[0] + (compressed[1] << 8);
	c1 = compressed[2] + (compressed[3] << 8);
	stbi_rgb_888_from_565( c0, &r, &g, &b );
	decode_colors[0] = r;
	decode_colors[1] = g;
	decode_colors[2] = b;
	decode_colors[3] = 255;
	stbi_rgb_888_from_565( c1, &r, &g, &b );
	decode_colors[4] = r;
	decode_colors[5] = g;
	decode_colors[6] = b;
	decode_colors[7] = 255;
	if( c0 > c1 )
	{
		//	no alpha, 2 interpolated colors
		decode_colors[8] = (2*decode_colors[0] + decode_colors[4]) / 3;
		decode_colors[9] = (2*decode_colors[1] + decode_colors[5]) / 3;
		decode_colors[10] = (2*decode_colors[2] + decode_colors[6]) / 3;
		decode_colors[11] = 255;
		decode_colors[12] = (decode_colors[0] + 2*decode_colors[4]) / 3;
		decode_colors[13] = (decode_colors[1] + 2*decode_colors[5]) / 3;
		decode_colors[14] = (decode_colors[2] + 2*decode_colors[6]) / 3;
		decode_colors[15] = 255;
	} else
	{
		//	1 interpolated color, alpha
		decode_colors[8] = (decode_colors[0] + decode_colors[4]) / 2;
		decode_colors[9] = (decode_colors[1] + decode_colors[5]) / 2;
		decode_colors[10] = (decode_colors[2] + decode_colors[6]) / 2;
		decode_colors[11] = 255;
		decode_colors[12] = 0;
		decode_colors[13] = 0;
		decode_colors[14] = 0;
		decode_colors[15] = 0;
	}
	//	decode the block
	for( i = 0; i < 16*4; i += 4 )
	{
		int idx = ((compressed[next_bit>>3] >> (next_bit & 7)) & 3) * 4;
		next_bit += 2;
		uncompressed[i+0] = decode_colors[idx+0];
		uncompressed[i+1] = decode_colors[idx+1];
		uncompressed[i+2] = decode_colors[idx+2];
		uncompressed[i+3] = decode_colors[idx+3];
	}
	//	done
}
void stbi_decode_DXT23_alpha_block(
			unsigned char uncompressed[16*4],
			unsigned char compressed[8] )
{
	int i, next_bit = 0;
	//	each alpha value gets 4 bits
	for( i = 3; i < 16*4; i += 4 )
	{
		uncompressed[i] = stbi_convert_bit_range(
				(compressed[next_bit>>3] >> (next_bit&7)) & 15,
				4, 8 );
		next_bit += 4;
	}
}
void stbi_decode_DXT45_alpha_block(
			unsigned char uncompressed[16*4],
			unsigned char compressed[8] )
{
	int i, next_bit = 8*2;
	unsigned char decode_alpha[8];
	//	each alpha value gets 3 bits, and the 1st 2 bytes are the range
	decode_alpha[0] = compressed[0];
	decode_alpha[1] = compressed[1];
	if( decode_alpha[0] > decode_alpha[1] )
	{
		//	6 step intermediate
		decode_alpha[2] = (6*decode_alpha[0] + 1*decode_alpha[1]) / 7;
		decode_alpha[3] = (5*decode_alpha[0] + 2*decode_alpha[1]) / 7;
		decode_alpha[4] = (4*decode_alpha[0] + 3*decode_alpha[1]) / 7;
		decode_alpha[5] = (3*decode_alpha[0] + 4*decode_alpha[1]) / 7;
		decode_alpha[6] = (2*decode_alpha[0] + 5*decode_alpha[1]) / 7;
		decode_alpha[7] = (1*decode_alpha[0] + 6*decode_alpha[1]) / 7;
	} else
	{
		//	4 step intermediate, pluss full and none
		decode_alpha[2] = (4*decode_alpha[0] + 1*decode_alpha[1]) / 5;
		decode_alpha[3] = (3*decode_alpha[0] + 2*decode_alpha[1]) / 5;
		decode_alpha[4] = (2*decode_alpha[0] + 3*decode_alpha[1]) / 5;
		decode_alpha[5] = (1*decode_alpha[0] + 4*decode_alpha[1]) / 5;
		decode_alpha[6] = 0;
		decode_alpha[7] = 255;
	}
	for( i = 3; i < 16*4; i += 4 )
	{
		int idx = 0, bit;
		bit = (compressed[next_bit>>3] >> (next_bit&7)) & 1;
		idx += bit << 0;
		++next_bit;
		bit = (compressed[next_bit>>3] >> (next_bit&7)) & 1;
		idx += bit << 1;
		++next_bit;
		bit = (compressed[next_bit>>3] >> (next_bit&7)) & 1;
		idx += bit << 2;
		++next_bit;
		uncompressed[i] = decode_alpha[idx & 7];
	}
	//	done
}
void stbi_decode_DXT_color_block(
			unsigned char uncompressed[16*4],
			unsigned char compressed[8] )
{
	int next_bit = 4*8;
	int i, r, g, b;
	int c0, c1;
	unsigned char decode_colors[4*3];
	//	find the 2 primary colors
	c0 = compressed[0] + (compressed[1] << 8);
	c1 = compressed[2] + (compressed[3] << 8);
	stbi_rgb_888_from_565( c0, &r, &g, &b );
	decode_colors[0] = r;
	decode_colors[1] = g;
	decode_colors[2] = b;
	stbi_rgb_888_from_565( c1, &r, &g, &b );
	decode_colors[3] = r;
	decode_colors[4] = g;
	decode_colors[5] = b;
	//	Like DXT1, but no choicees:
	//	no alpha, 2 interpolated colors
	decode_colors[6] = (2*decode_colors[0] + decode_colors[3]) / 3;
	decode_colors[7] = (2*decode_colors[1] + decode_colors[4]) / 3;
	decode_colors[8] = (2*decode_colors[2] + decode_colors[5]) / 3;
	decode_colors[9] = (decode_colors[0] + 2*decode_colors[3]) / 3;
	decode_colors[10] = (decode_colors[1] + 2*decode_colors[4]) / 3;
	decode_colors[11] = (decode_colors[2] + 2*decode_colors[5]) / 3;
	//	decode the block
	for( i = 0; i < 16*4; i += 4 )
	{
		int idx = ((compressed[next_bit>>3] >> (next_bit & 7)) & 3) * 3;
		next_bit += 2;
		uncompressed[i+0] = decode_colors[idx+0];
		uncompressed[i+1] = decode_colors[idx+1];
		uncompressed[i+2] = decode_colors[idx+2];
	}
	//	done
}
static stbi_uc *dds_load(stbi *s, int *x, int *y, int *comp, int req_comp)
{
	//	all variables go up front
	stbi_uc *dds_data = NULL;
	stbi_uc block[16*4];
	stbi_uc compressed[8];
	int flags, DXT_family;
	int has_alpha, has_mipmap;
	int is_compressed, cubemap_faces;
	int block_pitch, num_blocks;
	DDS_header header;
	int i, sz, cf;
	//	load the header
	if( sizeof( DDS_header ) != 128 )
	{
		return NULL;
	}
	getn( s, (stbi_uc*)(&header), 128 );
	//	and do some checking
	if( header.dwMagic != (('D' << 0) | ('D' << 8) | ('S' << 16) | (' ' << 24)) ) return NULL;
	if( header.dwSize != 124 ) return NULL;
	flags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT;
	if( (header.dwFlags & flags) != flags ) return NULL;
	/*	According to the MSDN spec, the dwFlags should contain
		DDSD_LINEARSIZE if it's compressed, or DDSD_PITCH if
		uncompressed.  Some DDS writers do not conform to the
		spec, so I need to make my reader more tolerant	*/
	if( header.sPixelFormat.dwSize != 32 ) return NULL;
	flags = DDPF_FOURCC | DDPF_RGB;
	if( (header.sPixelFormat.dwFlags & flags) == 0 ) return NULL;
	if( (header.sCaps.dwCaps1 & DDSCAPS_TEXTURE) == 0 ) return NULL;
	//	get the image data
	s->img_x = header.dwWidth;
	s->img_y = header.dwHeight;
	s->img_n = 4;
	is_compressed = (header.sPixelFormat.dwFlags & DDPF_FOURCC) / DDPF_FOURCC;
	has_alpha = (header.sPixelFormat.dwFlags & DDPF_ALPHAPIXELS) / DDPF_ALPHAPIXELS;
	has_mipmap = (header.sCaps.dwCaps1 & DDSCAPS_MIPMAP) && (header.dwMipMapCount > 1);
	cubemap_faces = (header.sCaps.dwCaps2 & DDSCAPS2_CUBEMAP) / DDSCAPS2_CUBEMAP;
	/*	I need cubemaps to have square faces	*/
	cubemap_faces &= (s->img_x == s->img_y);
	cubemap_faces *= 5;
	cubemap_faces += 1;
	block_pitch = (s->img_x+3) >> 2;
	num_blocks = block_pitch * ((s->img_y+3) >> 2);
	/*	let the user know what's going on	*/
	*x = s->img_x;
	*y = s->img_y;
	*comp = s->img_n;
	/*	is this uncompressed?	*/
	if( is_compressed )
	{
		/*	compressed	*/
		//	note: header.sPixelFormat.dwFourCC is something like (('D'<<0)|('X'<<8)|('T'<<16)|('1'<<24))
		DXT_family = 1 + (header.sPixelFormat.dwFourCC >> 24) - '1';
		if( (DXT_family < 1) || (DXT_family > 5) ) return NULL;
		/*	check the expected size...oops, nevermind...
			those non-compliant writers leave
			dwPitchOrLinearSize == 0	*/
		//	passed all the tests, get the RAM for decoding
		sz = (s->img_x)*(s->img_y)*4*cubemap_faces;
		dds_data = (unsigned char*)malloc( sz );
		/*	do this once for each face	*/
		for( cf = 0; cf < cubemap_faces; ++ cf )
		{
			//	now read and decode all the blocks
			for( i = 0; i < num_blocks; ++i )
			{
				//	where are we?
				int bx, by, bw=4, bh=4;
				int ref_x = 4 * (i % block_pitch);
				int ref_y = 4 * (i / block_pitch);
				//	get the next block's worth of compressed data, and decompress it
				if( DXT_family == 1 )
				{
					//	DXT1
					getn( s, compressed, 8 );
					stbi_decode_DXT1_block( block, compressed );
				} else if( DXT_family < 4 )
				{
					//	DXT2/3
					getn( s, compressed, 8 );
					stbi_decode_DXT23_alpha_block ( block, compressed );
					getn( s, compressed, 8 );
					stbi_decode_DXT_color_block ( block, compressed );
				} else
				{
					//	DXT4/5
					getn( s, compressed, 8 );
					stbi_decode_DXT45_alpha_block ( block, compressed );
					getn( s, compressed, 8 );
					stbi_decode_DXT_color_block ( block, compressed );
				}
				//	is this a partial block?
				if( ref_x + 4 > s->img_x )
				{
					bw = s->img_x - ref_x;
				}
				if( ref_y + 4 > s->img_y )
				{
					bh = s->img_y - ref_y;
				}
				//	now drop our decompressed data into the buffer
				for( by = 0; by < bh; ++by )
				{
					int idx = 4*((ref_y+by+cf*s->img_x)*s->img_x + ref_x);
					for( bx = 0; bx < bw*4; ++bx )
					{

						dds_data[idx+bx] = block[by*16+bx];
					}
				}
			}
			/*	done reading and decoding the main image...
				skip MIPmaps if present	*/
			if( has_mipmap )
			{
				int block_size = 16;
				if( DXT_family == 1 )
				{
					block_size = 8;
				}
				for( i = 1; i < header.dwMipMapCount; ++i )
				{
					int mx = s->img_x >> (i + 2);
					int my = s->img_y >> (i + 2);
					if( mx < 1 )
					{
						mx = 1;
					}
					if( my < 1 )
					{
						my = 1;
					}
					skip( s, mx*my*block_size );
				}
			}
		}/* per cubemap face */
	} else
	{
		/*	uncompressed	*/
		DXT_family = 0;
		s->img_n = 3;
		if( has_alpha )
		{
			s->img_n = 4;
		}
		*comp = s->img_n;
		sz = s->img_x*s->img_y*s->img_n*cubemap_faces;
		dds_data = (unsigned char*)malloc( sz );
		/*	do this once for each face	*/
		for( cf = 0; cf < cubemap_faces; ++ cf )
		{
			/*	read the main image for this face	*/
			getn( s, &dds_data[cf*s->img_x*s->img_y*s->img_n], s->img_x*s->img_y*s->img_n );
			/*	done reading and decoding the main image...
				skip MIPmaps if present	*/
			if( has_mipmap )
			{
				for( i = 1; i < header.dwMipMapCount; ++i )
				{
					int mx = s->img_x >> i;
					int my = s->img_y >> i;
					if( mx < 1 )
					{
						mx = 1;
					}
					if( my < 1 )
					{
						my = 1;
					}
					skip( s, mx*my*s->img_n );
				}
			}
		}
		/*	data was BGR, I need it RGB	*/
		for( i = 0; i < sz; i += s->img_n )
		{
			unsigned char temp = dds_data[i];
			dds_data[i] = dds_data[i+2];
			dds_data[i+2] = temp;
		}
	}
	/*	finished decompressing into RGBA,
		adjust the y size if we have a cubemap
		note: sz is already up to date	*/
	s->img_y *= cubemap_faces;
	*y = s->img_y;
	//	did the user want something else, or
	//	see if all the alpha values are 255 (i.e. no transparency)
	has_alpha = 0;
	if( s->img_n == 4)
	{
		for( i = 3; (i < sz) && (has_alpha == 0); i += 4 )
		{
			has_alpha |= (dds_data[i] < 255);
		}
	}
	if( (req_comp <= 4) && (req_comp >= 1) )
	{
		//	user has some requirements, meet them
		if( req_comp != s->img_n )
		{
			dds_data = convert_format( dds_data, s->img_n, req_comp, s->img_x, s->img_y );
			*comp = s->img_n;
		}
	} else
	{
		//	user had no requirements, only drop to RGB is no alpha
		if( (has_alpha == 0) && (s->img_n == 4) )
		{
			dds_data = convert_format( dds_data, 4, 3, s->img_x, s->img_y );
			*comp = 3;
		}
	}
	//	OK, done
	return dds_data;
}

#ifndef STBI_NO_STDIO
stbi_uc *stbi_dds_load_from_file   (FILE *f,                  int *x, int *y, int *comp, int req_comp)
{
	stbi s;
   start_file(&s,f);
   return dds_load(&s,x,y,comp,req_comp);
}

stbi_uc *stbi_dds_load             (char *filename,           int *x, int *y, int *comp, int req_comp)
{
   stbi_uc *data;
   FILE *f = fopen(filename, "rb");
   if (!f) return NULL;
   data = stbi_dds_load_from_file(f,x,y,comp,req_comp);
   fclose(f);
   return data;
}
#endif

stbi_uc *stbi_dds_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
	stbi s;
   start_mem(&s,buffer, len);
   return dds_load(&s,x,y,comp,req_comp);
}

Added makefile.





































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all: tools link
build:
	mkdir -p build
visnov.cc.o: csrc/visnov.cc ext/soil/SOIL.h ext/fontstash/fontstash.h build
	cc -c -std=c++14 -Iext/soil/ -Iext/fontstash/ -fno-rtti -fno-exceptions -g csrc/visnov.cc -o build/visnov.cc.o
link:  visnov.cc.o soil fontstash build
	ar -rcs build/libvisnov.a build/*.o
	ocamlopt.opt -c build/libvisnov.a mlsrc/*.ml -cclib "-lglfw -lGL"
	mv mlsrc/*.cmx mlsrc/*.cmi build/
	cp mlsrc/*.ml build/
soil: build
	cd build && cc -c ../ext/soil/*.c
fontstash: build
	cd build && cc -c ../ext/fontstash/*.c
tools: build
	cc -std=c++14 tool/visnarc.cc -o build/visnarc
clean: build
	rm -r build

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type handle
type image
type font
external init : string -> string -> int -> int -> handle = "visnov_init" [@@noalloc]
external exit : unit -> unit = "visnov_exit" [@@noalloc]
external block : handle -> unit = "visnov_block" [@@noalloc]
external say : handle -> int -> string -> unit = "visnov_say" [@@noalloc]
external img : handle -> string -> image = "visnov_img" [@@noalloc]
external fnt : handle -> string -> font = "visnov_fnt" [@@noalloc]
external setfont : handle -> int -> font -> unit = "visnov_setfont" [@@noalloc]
external chr : handle -> int -> image -> unit = "visnov_chr" [@@noalloc]
external bg : handle -> image -> unit = "visnov_bg" [@@noalloc]
external layout : handle -> int -> unit = "visnov_layout" [@@noalloc]
external color : handle -> int -> int -> int -> unit = "visnov_color" [@@noalloc]

Added tool/visnarc.cc.







































































































































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#include <stdio.h>
#include <stdint.h>
#include <string.h>
struct ent {
	size_t start;
	size_t len;
	FILE* fs;
};
void plend(uint32_t v) {
	putchar(v & 0xff);
	putchar((v >> 8) & 0xff);
	putchar((v >> 16) & 0xff);
	putchar((v >> 24) & 0xff);
}
void pstr(uint8_t len, const char* s) {
	putchar(len);
	for (size_t i = 0; i<len; ++i) {
		putchar(s[i]);
	}
}
int main(int argc, char** argv) {
	if (argc == 1) {
		printf ("\x1b[1musage:\x1b[0m %s files... >> visnov", argv[0]);
	} else {
		ent ftbl[argc-1];
		size_t cursize = 0;
		size_t biggest = 0;
		for (uint16_t i = 0; i<argc-1; ++i) {
			ftbl[i].fs=fopen(argv[1+i], "rb");
			fseek(ftbl[i].fs, 0, SEEK_END);
			ftbl[i].start=cursize;
			ftbl[i].len=ftell(ftbl[i].fs);
			if (ftbl[i].len>biggest) biggest=ftbl[i].len;
			cursize+=ftbl[i].len;
			fseek(ftbl[i].fs, 0, SEEK_SET);
		}
		size_t sz = 2;
		putchar((argc-1) & 0xff);
		putchar(((argc-1)>>8) & 0xff);
		for (uint16_t i = 0; i<argc-1; ++i) {
			uint8_t sl = strlen(argv[i+1]);
			pstr(sl,argv[1+i]); sz+=sl+1;
			plend(ftbl[i].start); sz+=4;
			plend(ftbl[i].len); sz+=4;
		}
		for (uint16_t i = 0; i<argc-1; ++i) {
			char buf[biggest];
			fread(buf,ftbl[i].len,1,ftbl[i].fs);
			for (size_t j = 0; j<ftbl[i].len; ++j) {
				putchar(buf[j]);		// printf is not binary-safe
			}
			sz += ftbl[i].len;
		}
		plend(sz);		
		putchar(0x9e);
		putchar(0xcf);
		putchar(0x44);
		fprintf(stderr,"\x1b[32;1mdone:\x1b[0m attached %d files, total size ",argc-1);
		if (sz < 1024) {
			fprintf(stderr, "%lu\n", sz);
		} else if (sz < 1024*1024) {
			fprintf(stderr, "%lu.%luK\n",sz / 1024, (sz % 1024) / 10000);
		} else {
			fprintf(stderr, "%lu.%luM\n",sz / (1024*1024), (sz % (1024*1024) / 10000));
		}
	}
}