commit b89907ba6b59ff9915544d1c07e76382bb9ac450 Author: Mikko Mononen Date: Tue Nov 12 08:34:27 2013 +0100 First commit diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..70f534e --- /dev/null +++ b/.gitignore @@ -0,0 +1,28 @@ +## Compiled source # +*.com +*.class +*.dll +*.exe +*.o +*.so +test + +## Logs and databases # +*.log +*.sql +*.sqlite + +## OS generated files # +.DS_Store +.DS_Store? +._* +.Spotlight-V100 +.Trashes +ehthumbs.db +Thumbs.db + +## Build dir +build/* + +## xcode specific +*xcuserdata* diff --git a/README.md b/README.md new file mode 100644 index 0000000..549803d --- /dev/null +++ b/README.md @@ -0,0 +1,138 @@ +Font Stash +========== + +Font stash is light-weight online font texture atlas builder written in C. It uses [stb_truetype](http://nothings.org) to render fonts on demand to a texture atlas. + +The code is split in two parts, the font atlas and glyph quad generator [fontstash.h](/src/fontstash.h), and an example OpenGL backend ([glstash.h](/glstash.h). + +## Screenshot + +![screenshot of some text rendered witht the sample program](/screenshots/screen-01.png?raw=true) + +## Example +``` C +// Create stash for 512x512 texture, our coordinate system has zero at top-left. +struct FONSparams params; +memset(¶ms, 0, sizeof(params)); +params.width = 512; +params.height = 512; +params.flags = FONS_ZERO_TOPLEFT; +glstInit(¶ms); +struct FONScontext* fs = fonsCreate(¶ms); + +// Add font to stash. +int fontNormal = fonsAddFont(fs, "DroidSerif-Regular.ttf"); + +// Render some text +float dx = 10, dy = 10; +unsigned int white = glstRGBA(255,255,255,255); +unsigned int brown = glstRGBA(192,128,0,128); + +struct fontstash_style styleBig = { FONT_NORMAL, 124.0f, white }; + +fonsSetFont(fs, fontNormal); +fonsSetSize(fs, 124.0f); +fonsSetColor(fs, white); +fonsDrawText(fs, dx,dy,"The big ", &dx); + +fonsSetSize(fs, 24.0f); +fonsSetColor(fs, brown); +fonsDrawText(fs, dx,dy,"brown fox", &dx); +``` + +## Using Font Stash in your project + +In order to use fontstash in your own project, just copy fontstash.h, stb_truetype.h, and potentially glstash.h to your project. +In one C/C++ define FONTSTASH_IMPLEMENTATION before including the library to expand the font stash implementation in that file. + +``` C +#include // malloc, free, fopen, fclose, ftell, fseek, fread +#include // memset +#define FONTSTASH_IMPLEMENTATION // Expands implementation +#include "fontstash.h" +``` + +``` C +#include // Or any other GL header of your choice. +#define GLSTASH_IMPLEMENTATION // Expands implementation +#include "glstash.h" +``` + +## Creating new rendering backend + +The default rendering backend uses OpenGL to render the glyphs. If you want to render the text using some other API, or want tighter integration with your code base you can write your own rendering backend. Take a look at the [glstash.h](/src/glstash.h) for reference implementation. + +The rendering interface FontStash assumes access to is defined in the FONSparams structure. The call to `glstInit()` fills in variables. + +```C +struct FONSparams { + ... + void* userPtr; + int (*renderCreate)(void* uptr, int width, int height); + void (*renderUpdate)(void* uptr, int* rect, const unsigned char* data); + void (*renderDraw)(void* uptr, const float* verts, const float* tcoords, const unsigned int* colors, int nverts); + void (*renderDelete)(void* uptr); +}; +``` + +- **renderCreate** is called to create renderer for specific API, this is where you should create a texture of given size. + - return 1 of success, or 0 on failure. +- **renderUpdate** is called to update texture data + - _rect_ describes the region of the texture that has changed + - _data_ pointer to full texture data +- **renderDraw** is called when the font triangles should be drawn + - _verts_ pointer to vertex position data, 2 floats per vertex + - _tcoords_ pointer to texture coordinate data, 2 floats per vertex + - _colors_ pointer to color data, 1 uint per vertex (or 4 bytes) + - _nverts_ is the number of vertices to draw +- **renderDelete** is called when the renderer should be deleted +- **userPtr** is passed to all calls as first parameter + +FontStash uses this API as follows: + +``` +fonsDrawText() { + foreach (glyph in input string) { + if (internal buffer full) { + updateTexture() + render() + } + add glyph to interal draw buffer + } + updateTexture() + render() +} +``` + +The size of the internal buffer is defined using `FONS_VERTEX_COUNT` define. The default value is 1024, you can override it when you include fontstash.h and specify the implementation: + +``` C +#define FONS_VERTEX_COUNT 2048 +#define FONTSTASH_IMPLEMENTATION // Expands implementation +#include "fontstash.h" +``` + +## Compiling + +In order to compile the demo project, your will need to install [GLFW](http://www.glfw.org/) to compile. + +FontStash example project uses [premake4](http://industriousone.com/premake) to build platform specific projects, now is good time to install it if you don't have it already. To build the example, navigate into the root folder in your favorite terminal, then: + +- *OS X*: `premake4 xcode4` +- *Windows*: `premake4 vs2010` +- *Linux*: `premake4 gmake` + +See premake4 documentation for full list of supported build file types. The projects will be created in `build` folder. An example of building and running the example on OS X: + +```bash +$ premake4 gmake +$ cd build/ +$ make +$ ./example +``` + +# License +The library is licensed under [zlib license](LICENSE.txt) + +## Links +Uses [stb_truetype](http://nothings.org) for font rendering. diff --git a/example/FiraSans-Bold.ttf b/example/FiraSans-Bold.ttf new file mode 100755 index 0000000..c45687f Binary files /dev/null and b/example/FiraSans-Bold.ttf differ diff --git a/example/FiraSans-Light.ttf b/example/FiraSans-Light.ttf new file mode 100755 index 0000000..9dc6a16 Binary files /dev/null and b/example/FiraSans-Light.ttf differ diff --git a/example/FiraSans-Regular.ttf b/example/FiraSans-Regular.ttf new file mode 100755 index 0000000..93561ae Binary files /dev/null and b/example/FiraSans-Regular.ttf differ diff --git a/example/Roboto-Bold.ttf b/example/Roboto-Bold.ttf new file mode 100755 index 0000000..aaf374d Binary files /dev/null and b/example/Roboto-Bold.ttf differ diff --git a/example/Roboto-Light.ttf b/example/Roboto-Light.ttf new file mode 100755 index 0000000..664e1b2 Binary files /dev/null and b/example/Roboto-Light.ttf differ diff --git a/example/Roboto-Regular.ttf b/example/Roboto-Regular.ttf new file mode 100755 index 0000000..3e6e2e7 Binary files /dev/null and b/example/Roboto-Regular.ttf differ diff --git a/example/entypo.ttf b/example/entypo.ttf new file mode 100644 index 0000000..fc305d2 Binary files /dev/null and b/example/entypo.ttf differ diff --git a/example/example.c b/example/example.c new file mode 100644 index 0000000..f521b36 --- /dev/null +++ b/example/example.c @@ -0,0 +1,767 @@ +// +// Copyright (c) 2013 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 +#include +#include +#include +#include +#include "nanovg.h" +#define GLNANOVG_IMPLEMENTATION +#include "glnanovg.h" + +#define ICON_SEARCH 0x1F50D +#define ICON_CIRCLED_CROSS 0x2716 +#define ICON_CHEVRON_RIGHT 0xE75E +#define ICON_CHECK 0x2713 +#define ICON_LOGIN 0xE740 +#define ICON_TRASH 0xE729 + +static char* cpToUTF8(int cp, char* str) +{ + int n = 0; + if (cp < 0x80) n = 1; + else if (cp < 0x800) n = 2; + else if (cp < 0x10000) n = 3; + else if (cp < 0x200000) n = 4; + else if (cp < 0x4000000) n = 5; + else if (cp <= 0x7fffffff) n = 6; + str[n] = '\0'; + switch (n) { + case 6: str[5] = 0x80 | (cp & 0x3f); cp = cp >> 6; cp |= 0x4000000; + case 5: str[4] = 0x80 | (cp & 0x3f); cp = cp >> 6; cp |= 0x200000; + case 4: str[3] = 0x80 | (cp & 0x3f); cp = cp >> 6; cp |= 0x10000; + case 3: str[2] = 0x80 | (cp & 0x3f); cp = cp >> 6; cp |= 0x800; + case 2: str[1] = 0x80 | (cp & 0x3f); cp = cp >> 6; cp |= 0xc0; + case 1: str[0] = cp; + } + return str; +} + + +void drawWindow(struct NVGcontext* vg, const char* title, float x, float y, float w, float h) +{ + float cornerRadius = 3.0f; + struct NVGpaint shadowPaint; + struct NVGpaint headerPaint; + + nvgSave(vg); +// nvgClearState(vg); + + // Window + nvgBeginPath(vg); + nvgRoundedRect(vg, x,y, w,h, cornerRadius); + nvgFillColor(vg, nvgRGBA(28,30,34,192)); +// nvgFillColor(vg, nvgRGBA(0,0,0,128)); + nvgFill(vg); + + // Drop shadow + shadowPaint = nvgBoxGradient(vg, x,y+2, w,h, cornerRadius*2, 10, nvgRGBA(0,0,0,128), nvgRGBA(0,0,0,0)); + nvgBeginPath(vg); + nvgRect(vg, x-10,y-10, w+20,h+30); + nvgRoundedRect(vg, x,y, w,h, cornerRadius); + nvgPathWinding(vg, NVG_HOLE); + nvgFillPaint(vg, shadowPaint); + nvgFill(vg); + + // Header + headerPaint = nvgLinearGradient(vg, x,y,x,y+15, nvgRGBA(255,255,255,8), nvgRGBA(0,0,0,16)); + nvgBeginPath(vg); + nvgRoundedRect(vg, x+1,y+1, w-2,30, cornerRadius-1); + nvgFillPaint(vg, headerPaint); + nvgFill(vg); + nvgBeginPath(vg); + nvgMoveTo(vg, x+0.5f, y+0.5f+30); + nvgLineTo(vg, x+0.5f+w-1, y+0.5f+30); + nvgStrokeColor(vg, nvgRGBA(0,0,0,32)); + nvgStroke(vg); + + nvgFontSize(vg, 18.0f); + nvgFontFace(vg, "sans-bold"); + nvgTextAlign(vg,NVG_ALIGN_CENTER|NVG_ALIGN_MIDDLE); + + nvgFontBlur(vg,2); + nvgFillColor(vg, nvgRGBA(0,0,0,128)); + nvgText(vg, x+w/2,y+16+1, title); + + nvgFontBlur(vg,0); + nvgFillColor(vg, nvgRGBA(220,220,220,160)); + nvgText(vg, x+w/2,y+16, title); + + nvgRestore(vg); +} + +void drawSearchBox(struct NVGcontext* vg, const char* text, float x, float y, float w, float h) +{ + struct NVGpaint bg; + char icon[8]; + float cornerRadius = h/2-1; + + // Edit + bg = nvgBoxGradient(vg, x,y+1.5f, w,h, h/2,5, nvgRGBA(0,0,0,16), nvgRGBA(0,0,0,92)); + nvgBeginPath(vg); + nvgRoundedRect(vg, x,y, w,h, cornerRadius); + nvgFillPaint(vg, bg); + nvgFill(vg); + +/* nvgBeginPath(vg); + nvgRoundedRect(vg, x+0.5f,y+0.5f, w-1,h-1, cornerRadius-0.5f); + nvgStrokeColor(vg, nvgRGBA(0,0,0,48)); + nvgStroke(vg);*/ + + nvgFontSize(vg, h*1.3f); + nvgFontFace(vg, "icons"); + nvgFillColor(vg, nvgRGBA(255,255,255,64)); + nvgTextAlign(vg,NVG_ALIGN_CENTER|NVG_ALIGN_MIDDLE); + nvgText(vg, x+h*0.55f, y+h*0.55f, cpToUTF8(ICON_SEARCH,icon)); + + nvgFontSize(vg, 20.0f); + nvgFontFace(vg, "sans"); + nvgFillColor(vg, nvgRGBA(255,255,255,32)); + + nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE); + nvgText(vg, x+h*1.05f,y+h*0.5f,text); + + nvgFontSize(vg, h*1.3f); + nvgFontFace(vg, "icons"); + nvgFillColor(vg, nvgRGBA(255,255,255,32)); + nvgTextAlign(vg,NVG_ALIGN_CENTER|NVG_ALIGN_MIDDLE); + nvgText(vg, x+w-h*0.55f, y+h*0.55f, cpToUTF8(ICON_CIRCLED_CROSS,icon)); +} + +void drawDropDown(struct NVGcontext* vg, const char* text, float x, float y, float w, float h) +{ + struct NVGpaint bg; + char icon[8]; + float cornerRadius = 4.0f; + + bg = nvgLinearGradient(vg, x,y,x,y+h, nvgRGBA(255,255,255,16), nvgRGBA(0,0,0,16)); + nvgBeginPath(vg); + nvgRoundedRect(vg, x+1,y+1, w-2,h-2, cornerRadius-1); + nvgFillPaint(vg, bg); + nvgFill(vg); + + nvgBeginPath(vg); + nvgRoundedRect(vg, x+0.5f,y+0.5f, w-1,h-1, cornerRadius-0.5f); + nvgStrokeColor(vg, nvgRGBA(0,0,0,48)); + nvgStroke(vg); + + nvgFontSize(vg, 20.0f); + nvgFontFace(vg, "sans"); + nvgFillColor(vg, nvgRGBA(255,255,255,160)); + nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE); + nvgText(vg, x+h*0.3f,y+h*0.5f,text); + + nvgFontSize(vg, h*1.3f); + nvgFontFace(vg, "icons"); + nvgFillColor(vg, nvgRGBA(255,255,255,64)); + nvgTextAlign(vg,NVG_ALIGN_CENTER|NVG_ALIGN_MIDDLE); + nvgText(vg, x+w-h*0.5f, y+h*0.5f, cpToUTF8(ICON_CHEVRON_RIGHT,icon)); +} + +void drawLabel(struct NVGcontext* vg, const char* text, float x, float y, float w, float h) +{ + nvgFontSize(vg, 18.0f); + nvgFontFace(vg, "sans"); + nvgFillColor(vg, nvgRGBA(255,255,255,128)); + + nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE); + nvgText(vg, x,y+h*0.5f,text); +} + +void drawEditBoxBase(struct NVGcontext* vg, float x, float y, float w, float h) +{ + struct NVGpaint bg; + // Edit + bg = nvgBoxGradient(vg, x+1,y+1+1.5f, w-2,h-2, 3,4, nvgRGBA(255,255,255,32), nvgRGBA(32,32,32,32)); + nvgBeginPath(vg); + nvgRoundedRect(vg, x+1,y+1, w-2,h-2, 4-1); + nvgFillPaint(vg, bg); + nvgFill(vg); + + nvgBeginPath(vg); + nvgRoundedRect(vg, x+0.5f,y+0.5f, w-1,h-1, 4-0.5f); + nvgStrokeColor(vg, nvgRGBA(0,0,0,48)); + nvgStroke(vg); +} + +void drawEditBox(struct NVGcontext* vg, const char* text, float x, float y, float w, float h) +{ + + drawEditBoxBase(vg, x,y, w,h); + + nvgFontSize(vg, 20.0f); + nvgFontFace(vg, "sans"); + nvgFillColor(vg, nvgRGBA(255,255,255,64)); + nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE); + nvgText(vg, x+h*0.3f,y+h*0.5f,text); +} + +void drawEditBoxNum(struct NVGcontext* vg, + const char* text, const char* units, float x, float y, float w, float h) +{ + float uw; + + drawEditBoxBase(vg, x,y, w,h); + + nvgTextBounds(vg, units, &uw, NULL); + + nvgFontSize(vg, 18.0f); + nvgFontFace(vg, "sans"); + nvgFillColor(vg, nvgRGBA(255,255,255,64)); + nvgTextAlign(vg,NVG_ALIGN_RIGHT|NVG_ALIGN_MIDDLE); + nvgText(vg, x+w-h*0.3f,y+h*0.5f,units); + + nvgFontSize(vg, 20.0f); + nvgFontFace(vg, "sans"); + nvgFillColor(vg, nvgRGBA(255,255,255,128)); + nvgTextAlign(vg,NVG_ALIGN_RIGHT|NVG_ALIGN_MIDDLE); + nvgText(vg, x+w-uw-h*0.5f,y+h*0.5f,text); +} + +void drawCheckBox(struct NVGcontext* vg, const char* text, float x, float y, float w, float h) +{ + struct NVGpaint bg; + char icon[8]; + + nvgFontSize(vg, 18.0f); + nvgFontFace(vg, "sans"); + nvgFillColor(vg, nvgRGBA(255,255,255,160)); + + nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE); + nvgText(vg, x+28,y+h*0.5f,text); + + bg = nvgBoxGradient(vg, x+1,y+(int)(h*0.5f)-9+1, 18,18, 3,3, nvgRGBA(0,0,0,32), nvgRGBA(0,0,0,92)); + nvgBeginPath(vg); + nvgRoundedRect(vg, x+1,y+(int)(h*0.5f)-9, 18,18, 3); + nvgFillPaint(vg, bg); + nvgFill(vg); + + nvgFontSize(vg, 40); + nvgFontFace(vg, "icons"); + nvgFillColor(vg, nvgRGBA(255,255,255,128)); + nvgTextAlign(vg,NVG_ALIGN_CENTER|NVG_ALIGN_MIDDLE); + nvgText(vg, x+9+2, y+h*0.5f, cpToUTF8(ICON_CHECK,icon)); +} + +void drawButton(struct NVGcontext* vg, int preicon, const char* text, float x, float y, float w, float h, unsigned int col) +{ + struct NVGpaint bg; + char icon[8]; + float cornerRadius = 4.0f; + float tw = 0, iw = 0; + + bg = nvgLinearGradient(vg, x,y,x,y+h, nvgRGBA(255,255,255,col==0?16:32), nvgRGBA(0,0,0,col==0?16:32)); + nvgBeginPath(vg); + nvgRoundedRect(vg, x+1,y+1, w-2,h-2, cornerRadius-1); + if (col != 0) { + nvgFillColor(vg, col); + nvgFill(vg); + } + nvgFillPaint(vg, bg); + nvgFill(vg); + + nvgBeginPath(vg); + nvgRoundedRect(vg, x+0.5f,y+0.5f, w-1,h-1, cornerRadius-0.5f); + nvgStrokeColor(vg, nvgRGBA(0,0,0,48)); + nvgStroke(vg); + + nvgFontSize(vg, 20.0f); + nvgFontFace(vg, "sans-bold"); + nvgTextBounds(vg, text, &tw, NULL); + if (preicon != 0) { + nvgFontSize(vg, h*1.3f); + nvgFontFace(vg, "icons"); + nvgTextBounds(vg, cpToUTF8(preicon,icon), &iw, NULL); + iw += h*0.15f; + } + + if (preicon != 0) { + nvgFontSize(vg, h*1.3f); + nvgFontFace(vg, "icons"); + nvgFillColor(vg, nvgRGBA(255,255,255,96)); + nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE); + nvgText(vg, x+w*0.5f-tw*0.5f-iw*0.75f, y+h*0.5f, cpToUTF8(preicon,icon)); + } + + nvgFontSize(vg, 20.0f); + nvgFontFace(vg, "sans-bold"); + nvgTextAlign(vg,NVG_ALIGN_LEFT|NVG_ALIGN_MIDDLE); + nvgFillColor(vg, nvgRGBA(0,0,0,160)); + nvgText(vg, x+w*0.5f-tw*0.5f+iw*0.25f,y+h*0.5f-1,text); + nvgFillColor(vg, nvgRGBA(255,255,255,160)); + nvgText(vg, x+w*0.5f-tw*0.5f+iw*0.25f,y+h*0.5f,text); +} + +void drawSlider(struct NVGcontext* vg, float pos, float x, float y, float w, float h) +{ + struct NVGpaint bg, knob; + float cy = y+(int)(h*0.5f); + float kr = (int)(h*0.25f); + + nvgSave(vg); +// nvgClearState(vg); + + // Slot + bg = nvgBoxGradient(vg, x,cy-2+1, w,4, 2,2, nvgRGBA(0,0,0,32), nvgRGBA(0,0,0,128)); + nvgBeginPath(vg); + nvgRoundedRect(vg, x,cy-2, w,4, 2); + nvgFillPaint(vg, bg); + nvgFill(vg); + + // Knob Shadow + bg = nvgRadialGradient(vg, x+(int)(pos*w),cy+1, kr-3,kr+3, nvgRGBA(0,0,0,64), nvgRGBA(0,0,0,0)); + nvgBeginPath(vg); + nvgRect(vg, x+(int)(pos*w)-kr-5,cy-kr-5,kr*2+5+5,kr*2+5+5+3); + nvgCircle(vg, x+(int)(pos*w),cy, kr); + nvgPathWinding(vg, NVG_HOLE); + nvgFillPaint(vg, bg); + nvgFill(vg); + + // Knob + knob = nvgLinearGradient(vg, x,cy-kr,x,cy+kr, nvgRGBA(255,255,255,16), nvgRGBA(0,0,0,16)); + nvgBeginPath(vg); + nvgCircle(vg, x+(int)(pos*w),cy, kr-1); + nvgFillColor(vg, nvgRGBA(40,43,48,255)); + nvgFill(vg); + nvgFillPaint(vg, knob); + nvgFill(vg); + + nvgBeginPath(vg); + nvgCircle(vg, x+(int)(pos*w),cy, kr-0.5f); + nvgStrokeColor(vg, nvgRGBA(0,0,0,92)); + nvgStroke(vg); + + nvgRestore(vg); +} + +void drawEyes(struct NVGcontext* vg, float x, float y, float w, float h, float mx, float my, float t) +{ + struct NVGpaint gloss, bg; + float ex = w *0.23f; + float ey = h * 0.5f; + float lx = x + ex; + float ly = y + ey; + float rx = x + w - ex; + float ry = y + ey; + float dx,dy,d; + float br = (ex < ey ? ex : ey) * 0.5f; + float blink = 1 - pow(sinf(t*0.5f),200)*0.8f; + + bg = nvgLinearGradient(vg, x,y+h*0.5f,x+w*0.1f,y+h, nvgRGBA(0,0,0,32), nvgRGBA(0,0,0,16)); + nvgBeginPath(vg); + nvgEllipse(vg, lx+3.0f,ly+16.0f, ex,ey); + nvgEllipse(vg, rx+3.0f,ry+16.0f, ex,ey); + nvgFillPaint(vg, bg); + nvgFill(vg); + + bg = nvgLinearGradient(vg, x,y+h*0.25f,x+w*0.1f,y+h, nvgRGBA(220,220,220,255), nvgRGBA(128,128,128,255)); + nvgBeginPath(vg); + nvgEllipse(vg, lx,ly, ex,ey); + nvgEllipse(vg, rx,ry, ex,ey); + nvgFillPaint(vg, bg); + nvgFill(vg); + + dx = (mx - rx) / (ex * 10); + dy = (my - ry) / (ey * 10); + d = sqrtf(dx*dx+dy*dy); + if (d > 1.0f) { + dx /= d; dy /= d; + } + dx *= ex*0.4f; + dy *= ey*0.5f; + nvgBeginPath(vg); + nvgEllipse(vg, lx+dx,ly+dy+ey*0.25f*(1-blink), br,br*blink); + nvgFillColor(vg, nvgRGBA(32,32,32,255)); + nvgFill(vg); + + dx = (mx - rx) / (ex * 10); + dy = (my - ry) / (ey * 10); + d = sqrtf(dx*dx+dy*dy); + if (d > 1.0f) { + dx /= d; dy /= d; + } + dx *= ex*0.4f; + dy *= ey*0.5f; + nvgBeginPath(vg); + nvgEllipse(vg, rx+dx,ry+dy+ey*0.25f*(1-blink), br,br*blink); + nvgFillColor(vg, nvgRGBA(32,32,32,255)); + nvgFill(vg); + + gloss = nvgRadialGradient(vg, lx-ex*0.25f,ly-ey*0.5f, ex*0.1f,ex*0.75f, nvgRGBA(255,255,255,128), nvgRGBA(255,255,255,0)); + nvgBeginPath(vg); + nvgEllipse(vg, lx,ly, ex,ey); + nvgFillPaint(vg, gloss); + nvgFill(vg); + + gloss = nvgRadialGradient(vg, rx-ex*0.25f,ry-ey*0.5f, ex*0.1f,ex*0.75f, nvgRGBA(255,255,255,128), nvgRGBA(255,255,255,0)); + nvgBeginPath(vg); + nvgEllipse(vg, rx,ry, ex,ey); + nvgFillPaint(vg, gloss); + nvgFill(vg); +} + +void drawGraph(struct NVGcontext* vg, float x, float y, float w, float h, float t) +{ + struct NVGpaint bg; + float samples[6]; + float sx[6], sy[6]; + float dx = w/5.0f; + int i; + + samples[0] = (1+sinf(t*1.2345f+cosf(t*0.33457f)*0.44f))*0.5f; + samples[1] = (1+sinf(t*0.68363f+cosf(t*1.3f)*1.55f))*0.5f; + samples[2] = (1+sinf(t*1.1642f+cosf(t*0.33457)*1.24f))*0.5f; + samples[3] = (1+sinf(t*0.56345f+cosf(t*1.63f)*0.14f))*0.5f; + samples[4] = (1+sinf(t*1.6245f+cosf(t*0.254f)*0.3f))*0.5f; + samples[5] = (1+sinf(t*0.345f+cosf(t*0.03f)*0.6f))*0.5f; + + for (i = 0; i < 6; i++) { + sx[i] = x+i*dx; + sy[i] = y+h*samples[i]*0.8f; + } + + // Graph background + bg = nvgLinearGradient(vg, x,y,x,y+h, nvgRGBA(0,160,192,0), nvgRGBA(0,160,192,64)); + nvgBeginPath(vg); + nvgMoveTo(vg, sx[0], sy[0]); + for (i = 1; i < 6; i++) + nvgBezierTo(vg, sx[i-1]+dx*0.5f,sy[i-1], sx[i]-dx*0.5f,sy[i], sx[i],sy[i]); + nvgLineTo(vg, x+w, y+h); + nvgLineTo(vg, x, y+h); + nvgFillPaint(vg, bg); + nvgFill(vg); + + // Graph line + nvgBeginPath(vg); + nvgMoveTo(vg, sx[0], sy[0]+2); + for (i = 1; i < 6; i++) + nvgBezierTo(vg, sx[i-1]+dx*0.5f,sy[i-1]+2, sx[i]-dx*0.5f,sy[i]+2, sx[i],sy[i]+2); + nvgStrokeColor(vg, nvgRGBA(0,0,0,32)); + nvgStrokeWidth(vg, 3.0f); + nvgStroke(vg); + + nvgBeginPath(vg); + nvgMoveTo(vg, sx[0], sy[0]); + for (i = 1; i < 6; i++) + nvgBezierTo(vg, sx[i-1]+dx*0.5f,sy[i-1], sx[i]-dx*0.5f,sy[i], sx[i],sy[i]); + nvgStrokeColor(vg, nvgRGBA(0,160,192,255)); + nvgStrokeWidth(vg, 3.0f); + nvgStroke(vg); + + // Graph sample pos + for (i = 0; i < 6; i++) { + bg = nvgRadialGradient(vg, sx[i],sy[i]+2, 3.0f,8.0f, nvgRGBA(0,0,0,32), nvgRGBA(0,0,0,0)); + nvgBeginPath(vg); + nvgRect(vg, sx[i]-10, sy[i]-10+2, 20,20); + nvgFillPaint(vg, bg); + nvgFill(vg); + } + + nvgBeginPath(vg); + for (i = 0; i < 6; i++) + nvgCircle(vg, sx[i], sy[i], 4.0f); + nvgFillColor(vg, nvgRGBA(0,160,192,255)); + nvgFill(vg); + nvgBeginPath(vg); + for (i = 0; i < 6; i++) + nvgCircle(vg, sx[i], sy[i], 2.0f); + nvgFillColor(vg, nvgRGBA(220,220,220,255)); + nvgFill(vg); + + nvgStrokeWidth(vg, 1.0f); +} + +void drawThumbnails(struct NVGcontext* vg, float x, float y, float w, float h, const int* images, int nimages, float t) +{ + float cornerRadius = 3.0f; + struct NVGpaint shadowPaint, imgPaint, fadePaint; + float ix,iy,iw,ih; + float thumb = 60.0f; + float arry = 30.5f; + int imgw, imgh; + float stackh = (nimages/2) * (thumb+10) + 10; + int i; + float u = (1+cosf(t*0.5f))*0.5f; + + nvgSave(vg); +// nvgClearState(vg); + + // Drop shadow + shadowPaint = nvgBoxGradient(vg, x,y+4, w,h, cornerRadius*2, 20, nvgRGBA(0,0,0,128), nvgRGBA(0,0,0,0)); + nvgBeginPath(vg); + nvgRect(vg, x-10,y-10, w+20,h+30); + nvgRoundedRect(vg, x,y, w,h, cornerRadius); + nvgPathWinding(vg, NVG_HOLE); + nvgFillPaint(vg, shadowPaint); + nvgFill(vg); + + // Window + nvgBeginPath(vg); + nvgRoundedRect(vg, x,y, w,h, cornerRadius); + nvgMoveTo(vg, x-10,y+arry); + nvgLineTo(vg, x+1,y+arry-11); + nvgLineTo(vg, x+1,y+arry+11); + nvgFillColor(vg, nvgRGBA(200,200,200,255)); + nvgFill(vg); + + nvgSave(vg); + nvgScissor(vg, x,y,w,h); + nvgTranslate(vg, 0, -(stackh - h)*u); + + for (i = 0; i < nimages; i++) { + float tx, ty; + tx = x+10; + ty = y+10; + tx += (i%2) * (thumb+10); + ty += (i/2) * (thumb+10); + nvgImageSize(vg, images[i], &imgw, &imgh); + if (imgw < imgh) { + iw = thumb; + ih = iw * (float)imgh/(float)imgw; + ix = 0; + iy = -(ih-thumb)*0.5f; + } else { + ih = thumb; + iw = ih * (float)imgw/(float)imgh; + ix = -(iw-thumb)*0.5f; + iy = 0; + } + imgPaint = nvgImagePattern(vg, tx+ix, ty+iy, iw,ih, 0.0f/180.0f*NVG_PI, images[i], 0); + nvgBeginPath(vg); + nvgRoundedRect(vg, tx,ty, thumb,thumb, 5); + nvgFillPaint(vg, imgPaint); + nvgFill(vg); + + shadowPaint = nvgBoxGradient(vg, tx-1,ty, thumb+2,thumb+2, 5, 3, nvgRGBA(0,0,0,128), nvgRGBA(0,0,0,0)); + nvgBeginPath(vg); + nvgRect(vg, tx-5,ty-5, thumb+10,thumb+10); + nvgRoundedRect(vg, tx,ty, thumb,thumb, 6); + nvgPathWinding(vg, NVG_HOLE); + nvgFillPaint(vg, shadowPaint); + nvgFill(vg); + + nvgBeginPath(vg); + nvgRoundedRect(vg, tx+0.5f,ty+0.5f, thumb-1,thumb-1, 4-0.5f); + nvgStrokeWidth(vg,1.0f); + nvgStrokeColor(vg, nvgRGBA(255,255,255,192)); + nvgStroke(vg); + } + nvgRestore(vg); + + // Hide fades + fadePaint = nvgLinearGradient(vg, x,y,x,y+6, nvgRGBA(200,200,200,255), nvgRGBA(200,200,200,0)); + nvgBeginPath(vg); + nvgRect(vg, x+4,y,w-8,6); + nvgFillPaint(vg, fadePaint); + nvgFill(vg); + + fadePaint = nvgLinearGradient(vg, x,y+h,x,y+h-6, nvgRGBA(200,200,200,255), nvgRGBA(200,200,200,0)); + nvgBeginPath(vg); + nvgRect(vg, x+4,y+h-6,w-8,6); + nvgFillPaint(vg, fadePaint); + nvgFill(vg); + + // Scroll bar + shadowPaint = nvgBoxGradient(vg, x+w-12+1,y+4+1, 8,h-8, 3,4, nvgRGBA(0,0,0,32), nvgRGBA(0,0,0,92)); + nvgBeginPath(vg); + nvgRoundedRect(vg, x+w-12,y+4, 8,h-8, 3); + nvgFillPaint(vg, shadowPaint); +// nvgFillColor(vg, nvgRGBA(255,0,0,128)); + nvgFill(vg); + + float scrollh = (h/stackh) * (h-8); + shadowPaint = nvgBoxGradient(vg, x+w-12-1,y+4+(h-8-scrollh)*u-1, 8,scrollh, 3,4, nvgRGBA(220,220,220,255), nvgRGBA(128,128,128,255)); + nvgBeginPath(vg); + nvgRoundedRect(vg, x+w-12+1,y+4+1 + (h-8-scrollh)*u, 8-2,scrollh-2, 2); + nvgFillPaint(vg, shadowPaint); +// nvgFillColor(vg, nvgRGBA(0,0,0,128)); + nvgFill(vg); + + nvgRestore(vg); +} + +void errorcb(int error, const char* desc) +{ + printf("GLFW error: %s\n", desc); +} + +int blowup = 0; + +static void key(GLFWwindow* window, int key, int scancode, int action, int mods) +{ + if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) + glfwSetWindowShouldClose(window, GL_TRUE); + if (key == GLFW_KEY_SPACE && action == GLFW_PRESS) + blowup = !blowup; +} + +int main() +{ + GLFWwindow* window; + int fontNormal = -1, fontBold = -1, fontIcons = -1; + struct NVGcontext* vg = NULL; + int images[12]; + int i; + + if (!glfwInit()) { + printf("Failed to init GLFW."); + return -1; + } + + glfwSetErrorCallback(errorcb); + + glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2); + glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0); + + window = glfwCreateWindow(1000, 600, "NanoVG", NULL, NULL); + if (!window) { + glfwTerminate(); + return -1; + } + + glfwSetKeyCallback(window, key); + + glfwMakeContextCurrent(window); + + vg = glnvgCreate(); + if (vg == NULL) { + printf("Could not init nanovg.\n"); + return -1; + } + + for (i = 0; i < 12; i++) { + char file[128]; + snprintf(file, 128, "../example/images/image%d.jpg", i+1); + images[i] = nvgCreateImage(vg, file); + if (images[i] == 0) { + printf("Could not load %s.\n", file); + return -1; + } + } + + fontIcons = nvgCreateFont(vg, "icons", "../example/entypo.ttf"); + if (fontIcons == -1) { + printf("Could not add font icons.\n"); + return -1; + } + fontNormal = nvgCreateFont(vg, "sans", "../example/Roboto-Regular.ttf"); +// fontNormal = nvgAddFont(vg, "sans", "../example/FiraSans-Regular.ttf"); + if (fontNormal == -1) { + printf("Could not add font italic.\n"); + return -1; + } + fontBold = nvgCreateFont(vg, "sans-bold", "../example/Roboto-Bold.ttf"); +// fontBold = nvgAddFont(vg, "sans-bold", "../example/FiraSans-Bold.ttf"); + if (fontBold == -1) { + printf("Could not add font bold.\n"); + return -1; + } + + + glfwSetTime(0); + + while (!glfwWindowShouldClose(window)) + { +// float sx, sy, dx, dy, lh = 0; + double mx, my; + int width, height; + glfwGetCursorPos(window, &mx, &my); + glfwGetFramebufferSize(window, &width, &height); + // 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|GL_STENCIL_BUFFER_BIT); + glEnable(GL_BLEND); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glEnable(GL_CULL_FACE); + glDisable(GL_TEXTURE_2D); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(0,width,height,0,-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); + + float t = glfwGetTime(); + float x,y,popy; + + nvgBeginFrame(vg); + + drawEyes(vg, width - 250, 50, 200, 120, mx, my, t); + drawGraph(vg, 0, height/2, width, height/2, t); + + nvgSave(vg); + if (blowup) { +// nvgRotate(vg, 3.0f/180.0f*NVG_PI); + nvgScale(vg, 2.0f, 2.0f); + } + + // Widgets + drawWindow(vg, "Widgets `n Stuff", 20, 20, 300, 400); + x = 30; y = 65; + drawSearchBox(vg, "Search", x,y,280,25); + y += 40; + drawDropDown(vg, "Effects", x,y,280,28); + popy = y + 14; + y += 45; + + // Form + drawLabel(vg, "Login", x,y, 280,20); + y += 25; + drawEditBox(vg, "Email", x,y, 280,28); + y += 35; + drawEditBox(vg, "Password", x,y, 280,28); + y += 38; + drawCheckBox(vg, "Remember me", x,y, 140,28); + drawButton(vg, ICON_LOGIN, "Sign in", x+138, y, 140, 28, nvgRGBA(0,96,128,255)); + y += 45; + + // Slider + drawLabel(vg, "Diameter", x,y, 280,20); + y += 25; + drawEditBoxNum(vg, "123.00", "px", x+180,y, 100,28); + drawSlider(vg, 0.4f, x,y, 170,28); + y += 55; + + drawButton(vg, ICON_TRASH, "Delete", x, y, 160, 28, nvgRGBA(128,16,8,255)); + drawButton(vg, 0, "Cancel", x+170, y, 110, 28, nvgRGBA(0,0,0,0)); + + // Thumbnails box + drawThumbnails(vg, 325, popy-30, 160, 300, images, 12, t); + + nvgRestore(vg); + + glEnable(GL_DEPTH_TEST); + + glfwSwapBuffers(window); + glfwPollEvents(); + } + + for (i = 0; i < 12; i++) + nvgDeleteImage(vg, images[i]); + + glnvgDelete(vg); + + glfwTerminate(); + return 0; +} diff --git a/example/glstash.h b/example/glstash.h new file mode 100644 index 0000000..977ae7c --- /dev/null +++ b/example/glstash.h @@ -0,0 +1,116 @@ +// +// Copyright (c) 2009-2013 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 GLSTASH_H +#define GLSTASH_H + +int glstInit(struct FONSparams* params); +unsigned int glstRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a); + +#endif + +#ifdef GLSTASH_IMPLEMENTATION + +struct GLSTcontext { + GLuint tex; + int width, height; +}; + +static int glst__renderCreate(void* userPtr, int width, int height) +{ + struct GLSTcontext* gl = (struct GLSTcontext*)userPtr; + glGenTextures(1, &gl->tex); + if (!gl->tex) return 0; + gl->width = width; + gl->height = width; + glBindTexture(GL_TEXTURE_2D, gl->tex); + glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, gl->width, gl->height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, 0); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + return 1; +} + +static void glst__renderUpdate(void* userPtr, int* rect, const unsigned char* data) +{ + struct GLSTcontext* gl = (struct GLSTcontext*)userPtr; + if (gl->tex == 0) return; + int w = rect[2] - rect[0]; + int h = rect[3] - rect[1]; + glBindTexture(GL_TEXTURE_2D, gl->tex); + glPixelStorei(GL_UNPACK_ALIGNMENT,1); + glPixelStorei(GL_UNPACK_ROW_LENGTH, gl->width); + glPixelStorei(GL_UNPACK_SKIP_PIXELS, rect[0]); + glPixelStorei(GL_UNPACK_SKIP_ROWS, rect[1]); + glTexSubImage2D(GL_TEXTURE_2D, 0, rect[0], rect[1], w, h, GL_ALPHA,GL_UNSIGNED_BYTE, data); +} + +static void glst__renderDraw(void* userPtr, const float* verts, const float* tcoords, const unsigned int* colors, int nverts) +{ + struct GLSTcontext* gl = (struct GLSTcontext*)userPtr; + if (gl->tex == 0) return; + glBindTexture(GL_TEXTURE_2D, gl->tex); + glEnable(GL_TEXTURE_2D); + glEnableClientState(GL_VERTEX_ARRAY); + glEnableClientState(GL_TEXTURE_COORD_ARRAY); + glEnableClientState(GL_COLOR_ARRAY); + + glVertexPointer(2, GL_FLOAT, sizeof(float)*2, verts); + glTexCoordPointer(2, GL_FLOAT, sizeof(float)*2, tcoords); + glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(unsigned int), colors); + + glDrawArrays(GL_TRIANGLES, 0, nverts); + + glDisable(GL_TEXTURE_2D); + glDisableClientState(GL_VERTEX_ARRAY); + glDisableClientState(GL_TEXTURE_COORD_ARRAY); + glDisableClientState(GL_COLOR_ARRAY); +} + +static void glst__renderDelete(void* userPtr) +{ + struct GLSTcontext* gl = (struct GLSTcontext*)userPtr; + if (gl->tex) + glDeleteTextures(1, &gl->tex); + gl->tex = 0; + free(gl); +} + + +int glstInit(struct FONSparams* params) +{ + struct GLSTcontext* gl = (struct GLSTcontext*)malloc(sizeof(struct GLSTcontext)); + if (gl == NULL) goto error; + memset(gl, 0, sizeof(struct GLSTcontext)); + + params->renderCreate = glst__renderCreate; + params->renderUpdate = glst__renderUpdate; + params->renderDraw = glst__renderDraw; + params->renderDelete = glst__renderDelete; + params->userPtr = gl; + + return 1; + +error: + if (gl != NULL) free(gl); + return 0; +} + +unsigned int glstRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a) +{ + return (r) | (g << 8) | (b << 16) | (a << 24); +} + +#endif diff --git a/example/icons.txt b/example/icons.txt new file mode 100644 index 0000000..64f61d2 --- /dev/null +++ b/example/icons.txt @@ -0,0 +1,431 @@ +struct Icon { + const char* name; + int codepoint; +}; + + +const char* getIcon(const char* name) +{ + static struct Icon icons[] = { + { "phone", 0x1F4DE }, + { "mobile", 0x1F4F1 }, + { "mouse", 0xE789 }, + { "address", 0xE723 }, + { "mail", 0x2709 }, + { "paper-plane", 0x1F53F }, + { "pencil", 0x270E }, + { "feather", 0x2712 }, + { "attach", 0x1F4CE }, + { "inbox", 0xE777 }, + { "reply", 0xE712 }, + { "reply-all", 0xE713 }, + { "forward", 0x27A6 }, + { "user", 0x1F464 }, + { "users", 0x1F465 }, + { "add-user", 0xE700 }, + { "vcard", 0xE722 }, + { "export", 0xE715 }, + { "location", 0xE724 }, + { "map", 0xE727 }, + { "compass", 0xE728 }, + { "direction", 0x27A2 }, + { "hair-cross", 0x1F3AF }, + { "share", 0xE73C }, + { "shareable", 0xE73E }, + { "heart", 0x2665 }, + { "heart-empty", 0x2661 }, + { "star", 0x2605 }, + { "star-empty", 0x2606 }, + { "thumbs-up", 0x1F44D }, + { "thumbs-down", 0x1F44E }, + { "chat", 0xE720 }, + { "comment", 0xE718 }, + { "quote", 0x275E }, + { "home", 0x2302 }, + { "popup", 0xE74C }, + { "search", 0x1F50D }, + { "flashlight", 0x1F526 }, + { "print", 0xE716 }, + { "bell", 0x1F514 }, + { "link", 0x1F517 }, + { "flag", 0x2691 }, + { "cog", 0x2699 }, + { "tools", 0x2692 }, + { "trophy", 0x1F3C6 }, + { "tag", 0xE70C }, + { "camera", 0x1F4F7 }, + { "megaphone", 0x1F4E3 }, + { "moon", 0x263D }, + { "palette", 0x1F3A8 }, + { "leaf", 0x1F342 }, + { "note", 0x266A }, + { "beamed-note", 0x266B }, + { "new", 0x1F4A5 }, + { "graduation-cap", 0x1F393 }, + { "book", 0x1F4D5 }, + { "newspaper", 0x1F4F0 }, + { "bag", 0x1F45C }, + { "airplane", 0x2708 }, + { "lifebuoy", 0xE788 }, + { "eye", 0xE70A }, + { "clock", 0x1F554 }, + { "mic", 0x1F3A4 }, + { "calendar", 0x1F4C5 }, + { "flash", 0x26A1 }, + { "thunder-cloud", 0x26C8 }, + { "droplet", 0x1F4A7 }, + { "cd", 0x1F4BF }, + { "briefcase", 0x1F4BC }, + { "air", 0x1F4A8 }, + { "hourglass", 0x23F3 }, + { "gauge", 0x1F6C7 }, + { "language", 0x1F394 }, + { "network", 0xE776 }, + { "key", 0x1F511 }, + { "battery", 0x1F50B }, + { "bucket", 0x1F4FE }, + { "magnet", 0xE7A1 }, + { "drive", 0x1F4FD }, + { "cup", 0x2615 }, + { "rocket", 0x1F680 }, + { "brush", 0xE79A }, + { "suitcase", 0x1F6C6 }, + { "traffic-cone", 0x1F6C8 }, + { "globe", 0x1F30E }, + { "keyboard", 0x2328 }, + { "browser", 0xE74E }, + { "publish", 0xE74D }, + { "progress-3", 0xE76B }, + { "progress-2", 0xE76A }, + { "progress-1", 0xE769 }, + { "progress-0", 0xE768 }, + { "light-down", 0x1F505 }, + { "light-up", 0x1F506 }, + { "adjust", 0x25D1 }, + { "code", 0xE714 }, + { "monitor", 0x1F4BB }, + { "infinity", 0x221E }, + { "light-bulb", 0x1F4A1 }, + { "credit-card", 0x1F4B3 }, + { "database", 0x1F4F8 }, + { "voicemail", 0x2707 }, + { "clipboard", 0x1F4CB }, + { "cart", 0xE73D }, + { "box", 0x1F4E6 }, + { "ticket", 0x1F3AB }, + { "rss", 0xE73A }, + { "signal", 0x1F4F6 }, + { "thermometer", 0x1F4FF }, + { "water", 0x1F4A6 }, + { "sweden", 0xF601 }, + { "line-graph", 0x1F4C8 }, + { "pie-chart", 0x25F4 }, + { "bar-graph", 0x1F4CA }, + { "area-graph", 0x1F53E }, + { "lock", 0x1F512 }, + { "lock-open", 0x1F513 }, + { "logout", 0xE741 }, + { "login", 0xE740 }, + { "check", 0x2713 }, + { "cross", 0x274C }, + { "squared-minus", 0x229F }, + { "squared-plus", 0x229E }, + { "squared-cross", 0x274E }, + { "circled-minus", 0x2296 }, + { "circled-plus", 0x2295 }, + { "circled-cross", 0x2716 }, + { "minus", 0x2796 }, + { "plus", 0x2795 }, + { "erase", 0x232B }, + { "block", 0x1F6AB }, + { "info", 0x2139 }, + { "circled-info", 0xE705 }, + { "help", 0x2753 }, + { "circled-help", 0xE704 }, + { "warning", 0x26A0 }, + { "cycle", 0x1F504 }, + { "cw", 0x27F3 }, + { "ccw", 0x27F2 }, + { "shuffle", 0x1F500 }, + { "back", 0x1F519 }, + { "level-down", 0x21B3 }, + { "retweet", 0xE717 }, + { "loop", 0x1F501 }, + { "back-in-time", 0xE771 }, + { "level-up", 0x21B0 }, + { "switch", 0x21C6 }, + { "numbered-list", 0xE005 }, + { "add-to-list", 0xE003 }, + { "layout", 0x268F }, + { "list", 0x2630 }, + { "text-doc", 0x1F4C4 }, + { "text-doc-inverted", 0xE731}, + { "doc", 0xE730 }, + { "docs", 0xE736 }, + { "landscape-doc", 0xE737 }, + { "picture", 0x1F304 }, + { "video", 0x1F3AC }, + { "music", 0x1F3B5 }, + { "folder", 0x1F4C1 }, + { "archive", 0xE800 }, + { "trash", 0xE729 }, + { "upload", 0x1F4E4 }, + { "download", 0x1F4E5 }, + { "save", 0x1F4BE }, + { "install", 0xE778 }, + { "cloud", 0x2601 }, + { "upload-cloud", 0xE711 }, + { "bookmark", 0x1F516 }, + { "bookmarks", 0x1F4D1 }, + { "open-book", 0x1F4D6 }, + { "play", 0x25B6 }, + { "paus", 0x2016 }, + { "record", 0x25CF }, + { "stop", 0x25A0 }, + { "ff", 0x23E9 }, + { "fb", 0x23EA }, + { "to-start", 0x23EE }, + { "to-end", 0x23ED }, + { "resize-full", 0xE744 }, + { "resize-small", 0xE746 }, + { "volume", 0x23F7 }, + { "sound", 0x1F50A }, + { "mute", 0x1F507 }, + { "flow-cascade", 0x1F568 }, + { "flow-branch", 0x1F569 }, + { "flow-tree", 0x1F56A }, + { "flow-line", 0x1F56B }, + { "flow-parallel", 0x1F56C }, + { "left-bold", 0xE4AD }, + { "down-bold", 0xE4B0 }, + { "up-bold", 0xE4AF }, + { "right-bold", 0xE4AE }, + { "left", 0x2B05 }, + { "down", 0x2B07 }, + { "up", 0x2B06 }, + { "right", 0x27A1 }, + { "circled-left", 0xE759 }, + { "circled-down", 0xE758 }, + { "circled-up", 0xE75B }, + { "circled-right", 0xE75A }, + { "triangle-left", 0x25C2 }, + { "triangle-down", 0x25BE }, + { "triangle-up", 0x25B4 }, + { "triangle-right", 0x25B8 }, + { "chevron-left", 0xE75D }, + { "chevron-down", 0xE75C }, + { "chevron-up", 0xE75F }, + { "chevron-right", 0xE75E }, + { "chevron-small-left", 0xE761 }, + { "chevron-small-down", 0xE760 }, + { "chevron-small-up", 0xE763 }, + { "chevron-small-right",0xE762 }, + { "chevron-thin-left", 0xE765 }, + { "chevron-thin-down", 0xE764 }, + { "chevron-thin-up", 0xE767 }, + { "chevron-thin-right", 0xE766 }, + { "left-thin", 0x2190 }, + { "down-thin", 0x2193 }, + { "up-thin", 0x2191 }, + { "right-thin", 0x2192 }, + { "arrow-combo", 0xE74F }, + { "three-dots", 0x23F6 }, + { "two-dots", 0x23F5 }, + { "dot", 0x23F4 }, + { "cc", 0x1F545 }, + { "cc-by", 0x1F546 }, + { "cc-nc", 0x1F547 }, + { "cc-nc-eu", 0x1F548 }, + { "cc-nc-jp", 0x1F549 }, + { "cc-sa", 0x1F54A }, + { "cc-nd", 0x1F54B }, + { "cc-pd", 0x1F54C }, + { "cc-zero", 0x1F54D }, + { "cc-share", 0x1F54E }, + { "cc-remix", 0x1F54F }, + { "db-logo", 0x1F5F9 }, + { "db-shape", 0x1F5FA }, + +/* { "icon-cloud", 0x2601 }, + { "icon-at", 0x0040 }, + { "icon-plus", 0x002B }, + + { "icon-arrow_up", 0x2191 }, + { "icon-arrow_down", 0x2193 }, + { "icon-arrow_right", 0x2192 }, + { "icon-arrow_left", 0x2190 }, + { "icon-chevron_down", 0xf004 }, + { "icon-chevron_up", 0xf005 }, + { "icon-chevron_right", 0xf006 }, + { "icon-chevron_left", 0xf007 }, + { "icon-reorder", 0xf008 }, + { "icon-list", 0xf009 }, + { "icon-reorder_square", 0xf00a }, + { "icon-reorder_square_line", 0xf00b }, + { "icon-coverflow", 0xf00c }, + { "icon-coverflow_line", 0xf00d }, + { "icon-pause", 0xf00e }, + { "icon-play", 0xf00f }, + + { "icon-step_forward", 0xf010 }, + { "icon-step_backward", 0xf011 }, + { "icon-fast_forward", 0xf012 }, + { "icon-fast_backward", 0xf013 }, + { "icon-cloud_upload", 0xf014 }, + { "icon-cloud_download", 0xf015 }, + { "icon-data_science", 0xf016 }, + { "icon-data_science_black", 0xf017 }, + { "icon-globe", 0xf018 }, + { "icon-globe_black", 0xf019 }, + { "icon-math_ico", 0xf01a }, + { "icon-math", 0xf01b }, + { "icon-math_black", 0xf01c }, + { "icon-paperplane_ico", 0xf01d }, + { "icon-paperplane", 0xf01e }, + { "icon-paperplane_black", 0xf01f }, + + { "icon-color_balance", 0xf020 }, + { "icon-star", 0x2605 }, + { "icon-star_half", 0xf022 }, + { "icon-star_empty", 0x2606 }, + { "icon-star_half_empty", 0xf024 }, + { "icon-reload", 0xf025 }, + + { "icon-heart", 0x2665 }, + { "icon-heart_broken", 0xf028 }, + { "icon-hashtag", 0xf029 }, + { "icon-reply", 0xf02a }, + { "icon-retweet", 0xf02b }, + { "icon-signin", 0xf02c }, + { "icon-signout", 0xf02d }, + { "icon-download", 0xf02e }, + { "icon-upload", 0xf02f }, + + + { "icon-placepin", 0xf031 }, + { "icon-display_screen", 0xf032 }, + { "icon-tablet", 0xf033 }, + { "icon-smartphone", 0xf034 }, + { "icon-connected_object", 0xf035 }, + { "icon-lock", 0xF512 }, + { "icon-unlock", 0xF513 }, + { "icon-camera", 0xF4F7 }, + { "icon-isight", 0xf039 }, + { "icon-video_camera", 0xf03a }, + { "icon-random", 0xf03b }, + { "icon-message", 0xF4AC }, + { "icon-discussion", 0xf03d }, + { "icon-calendar", 0xF4C5 }, + { "icon-ringbell", 0xf03f }, + + { "icon-movie", 0xf040 }, + { "icon-mail", 0x2709 }, + { "icon-pen", 0x270F }, + { "icon-settings", 0x9881 }, + { "icon-measure", 0xf044 }, + { "icon-vector", 0xf045 }, + { "icon-vector_pen", 0x2712 }, + { "icon-mute_on", 0xf047 }, + { "icon-mute_off", 0xf048 }, + { "icon-home", 0x2302 }, + { "icon-sheet", 0xf04a }, + { "icon-arrow_big_right", 0x21C9 }, + { "icon-arrow_big_left", 0x21C7 }, + { "icon-arrow_big_down", 0x21CA }, + { "icon-arrow_big_up", 0x21C8 }, + { "icon-dribbble_circle", 0xf04f }, + + { "icon-dribbble", 0xf050 }, + { "icon-facebook_circle", 0xf051 }, + { "icon-facebook", 0xf052 }, + { "icon-git_circle_alt", 0xf053 }, + { "icon-git_circle", 0xf054 }, + { "icon-git", 0xf055 }, + { "icon-octopus", 0xf056 }, + { "icon-twitter_circle", 0xf057 }, + { "icon-twitter", 0xf058 }, + { "icon-google_plus_circle", 0xf059 }, + { "icon-google_plus", 0xf05a }, + { "icon-linked_in_circle", 0xf05b }, + { "icon-linked_in", 0xf05c }, + { "icon-instagram", 0xf05d }, + { "icon-instagram_circle", 0xf05e }, + { "icon-mfg_icon", 0xf05f }, + + { "icon-mfg_icon_circle", 0xf060 }, + { "icon-user", 0xf061 }, + { "icon-user_male", 0xf062 }, + { "icon-user_female", 0xf063 }, + { "icon-users", 0xf064 }, + + { "icon-file_open", 0xF4C2 }, + { "icon-file_close", 0xf067 }, + { "icon-file_alt", 0xf068 }, + { "icon-file_close_alt", 0xf069 }, + { "icon-attachment", 0xf06a }, + { "icon-check", 0x2713 }, + { "icon-cross_mark", 0x274C }, + { "icon-cancel_circle", 0xF06E }, + { "icon-check_circle", 0xf06d }, + { "icon-magnifying", 0xF50D }, + + { "icon-inbox", 0xf070 }, + { "icon-clock", 0x23F2 }, + { "icon-stopwatch", 0x23F1 }, + { "icon-hourglass", 0x231B }, + { "icon-trophy", 0xf074 }, + { "icon-unlock_alt", 0xF075 }, + { "icon-lock_alt", 0xF510 }, + { "icon-arrow_doubled_right", 0x21D2 }, + { "icon-arrow_doubled_left", 0x21D0 }, + { "icon-arrow_doubled_down", 0x21D3 }, + { "icon-arrow_doubled_up", 0x21D1 }, + { "icon-link", 0xf07B }, + { "icon-warning", 0x2757 }, + { "icon-warning_alt", 0x2755 }, + { "icon-magnifying_plus", 0xf07E }, + { "icon-magnifying_minus", 0xf07F }, + + { "icon-white_question", 0x2754 }, + { "icon-black_question", 0x2753 }, + { "icon-stop", 0xf080 }, + { "icon-share", 0xf081 }, + { "icon-eye", 0xf082 }, + { "icon-trash_can", 0xf083 }, + { "icon-hard_drive", 0xf084 }, + { "icon-information_black", 0xf085 }, + { "icon-information_white", 0xf086 }, + { "icon-printer", 0xf087 }, + { "icon-letter", 0xf088 }, + { "icon-soundcloud", 0xf089 }, + { "icon-soundcloud_circle", 0xf08A }, + { "icon-anchor", 0x2693 }, + + { "icon-female_sign", 0x2640 }, + { "icon-male_sign", 0x2642 }, + { "icon-joystick", 0xF514 }, + { "icon-high_voltage", 0x26A1 }, + { "icon-fire", 0xF525 }, + { "icon-newspaper", 0xF4F0 }, + { "icon-chart", 0xF526 }, + { "icon-spread", 0xF527 }, + + { "icon-spinner_1", 0xF528 }, + { "icon-spinner_2", 0xF529 }, + + { "icon-chart_alt", 0xF530 }, + { "icon-label", 0xF531 },*/ + }; + static const int nicons = sizeof(icons) / sizeof(struct Icon); + int i; + static char str[8]; + + for (i = 0; i < nicons; i++) { + if (strcmp(icons[i].name, name) == 0) { + cpToUTF8(icons[i].codepoint, str); + return str; + } + } + + return ""; +} diff --git a/example/images.txt b/example/images.txt new file mode 100644 index 0000000..96ad626 --- /dev/null +++ b/example/images.txt @@ -0,0 +1,13 @@ +Image credits +http://cuteoverload.com/2013/11/05/mom-taxi-xvi-birthday-party/ +http://cuteoverload.com/2013/11/05/benson-hedges-private-eye-in-the-case-of-the-crafty-craftsman/ +http://cuteoverload.com/2013/11/05/no-underwater-ballets/ +http://cuteoverload.com/2013/11/05/every-nose-has-a-story/ +http://cuteoverload.com/2013/11/04/nosevember-nozzle-nose/ +http://cuteoverload.com/2013/11/04/this-just-in-super-strength-cute/ +http://cuteoverload.com/2013/11/03/have-a-bunderful-sunday/ +http://cuteoverload.com/2013/11/02/caturday-sense-a-common-theme-here/ +http://cuteoverload.com/2013/11/01/nosevember-1st-24-hours-of-noses-1148pm-pt/ +http://cuteoverload.com/2013/04/02/there-might-be-something-cuter-than-this/ +http://cuteoverload.com/2013/07/17/snorting-micro-peeg-gets-belleh-rubs-interwebs-explode/ +http://cuteoverload.com/2013/08/07/bark-in-the-park-v3-0/ \ No newline at end of file diff --git a/example/images/image1.jpg b/example/images/image1.jpg new file mode 100644 index 0000000..c2ce39b Binary 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a/example/mfglabsiconset-webfont.ttf b/example/mfglabsiconset-webfont.ttf new file mode 100755 index 0000000..a4cce0f Binary files /dev/null and b/example/mfglabsiconset-webfont.ttf differ diff --git a/example/templates.xml b/example/templates.xml new file mode 100644 index 0000000..d2402a3 --- /dev/null +++ b/example/templates.xml @@ -0,0 +1,84 @@ + + + + + + + diff --git a/premake4.lua b/premake4.lua new file mode 100644 index 0000000..23a24f0 --- /dev/null +++ b/premake4.lua @@ -0,0 +1,32 @@ + +local action = _ACTION or "" + +solution "nanovg" + location ( "build" ) + configurations { "Debug", "Release" } + platforms {"native", "x64", "x32"} + + project "example" + kind "ConsoleApp" + language "C" + files { "example/*.c", "src/*.h", "src/*.c" } + includedirs { "src" } + targetdir("build") + + configuration { "linux" } + links { "X11","Xrandr", "rt", "GL", "GLU", "pthread" } + + configuration { "windows" } + links { "glu32","opengl32", "gdi32", "winmm", "user32" } + + configuration { "macosx" } + links { "glfw3" } + linkoptions { "-framework OpenGL", "-framework Cocoa", "-framework IOKit" } + + configuration "Debug" + defines { "DEBUG" } + flags { "Symbols", "ExtraWarnings"} + + configuration "Release" + defines { "NDEBUG" } + flags { "Optimize", "ExtraWarnings"} diff --git a/src/fontstash.h b/src/fontstash.h new file mode 100644 index 0000000..0979001 --- /dev/null +++ b/src/fontstash.h @@ -0,0 +1,1134 @@ +// +// Copyright (c) 2009-2013 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 FONS_H +#define FONS_H + +#define FONS_INVALID -1 + +enum FONSflags { + FONS_ZERO_TOPLEFT = 1, + FONS_ZERO_BOTTOMLEFT = 2, +}; + +enum FONSaling { + // Horizontal align + FONS_ALIGN_LEFT = 1<<0, // Default + FONS_ALIGN_CENTER = 1<<1, + FONS_ALIGN_RIGHT = 1<<2, + // Vertical align + FONS_ALIGN_TOP = 1<<3, + FONS_ALIGN_MIDDLE = 1<<4, + FONS_ALIGN_BOTTOM = 1<<5, + FONS_ALIGN_BASELINE = 1<<6, // Default +}; + +struct FONSparams { + int width, height; + unsigned char flags; + void* userPtr; + int (*renderCreate)(void* uptr, int width, int height); + void (*renderUpdate)(void* uptr, int* rect, const unsigned char* data); + void (*renderDraw)(void* uptr, const float* verts, const float* tcoords, const unsigned int* colors, int nverts); + void (*renderDelete)(void* uptr); +}; + +struct FONSquad +{ + float x0,y0,s0,t0; + float x1,y1,s1,t1; +}; + +struct FONStextIter { + float x, y, scale, spacing; + short isize, iblur; + struct FONSfont* font; + struct FONSglyph* prevGlyph; + const char* str; + unsigned int utf8state; +}; + +// Contructor and destructor. +struct FONScontext* fonsCreate(struct FONSparams* params); +void fonsDelete(struct FONScontext* s); + +// Add fonts +int fonsAddFont(struct FONScontext* s, const char* name, const char* path); +int fonsAddFontMem(struct FONScontext* s, const char* name, unsigned char* data, int ndata, int freeData); +int fonsGetFontByName(struct FONScontext* s, const char* name); + +// State handling +void fonsPushState(struct FONScontext* s); +void fonsPopState(struct FONScontext* s); +void fonsClearState(struct FONScontext* s); + +// State setting +void fonsSetSize(struct FONScontext* s, float size); +void fonsSetColor(struct FONScontext* s, unsigned int color); +void fonsSetSpacing(struct FONScontext* s, float spacing); +void fonsSetBlur(struct FONScontext* s, float blur); +void fonsSetAlign(struct FONScontext* s, int align); +void fonsSetFont(struct FONScontext* s, int font); + +// Draw text +void fonsDrawText(struct FONScontext* s, float x, float y, const char* string, float* dx); + +// Measure text +void fonsTextBounds(struct FONScontext* s, const char* string, float* width, float* bounds); +void fonsVertMetrics(struct FONScontext* s, float* ascender, float* descender, float* lineh); + +// Text iterator +int fonsTextIterInit(struct FONScontext* stash, struct FONStextIter* iter, float x, float y, const char* s); +int fonsTextIterNext(struct FONScontext* stash, struct FONStextIter* iter, struct FONSquad* quad); + +// Pull texture data +const unsigned char* fonsGetTextureData(struct FONScontext* stash, int* width, int* height); +int fonsValidateTexture(struct FONScontext* s, int* dirty); + +// Draws the stash texture for debugging +void fonsDrawDebug(struct FONScontext* s, float x, float y); + +#endif // FONS_H + + +#ifdef FONTSTASH_IMPLEMENTATION + +#define STB_TRUETYPE_IMPLEMENTATION +static void* fons__tmpalloc(size_t size, void* up); +static void fons__tmpfree(void* ptr, void* up); +#define STBTT_malloc(x,u) fons__tmpalloc(x,u) +#define STBTT_free(x,u) fons__tmpfree(x,u) +#include "stb_truetype.h" + +#ifndef FONS_SCRATCH_BUF_SIZE +# define FONS_SCRATCH_BUF_SIZE 16000 +#endif +#ifndef FONS_HASH_LUT_SIZE +# define FONS_HASH_LUT_SIZE 256 +#endif +#ifndef FONS_INIT_FONTS +# define FONS_INIT_FONTS 4 +#endif +#ifndef FONS_INIT_ROWS +# define FONS_INIT_ROWS 64 +#endif +#ifndef FONS_INIT_GLYPHS +# define FONS_INIT_GLYPHS 256 +#endif +#ifndef FONS_VERTEX_COUNT +# define FONS_VERTEX_COUNT 1024 +#endif +#ifndef FONS_MAX_STATES +# define FONS_MAX_STATES 20 +#endif + +static unsigned int fons__hashint(unsigned int a) +{ + a += ~(a<<15); + a ^= (a>>10); + a += (a<<3); + a ^= (a>>6); + a += ~(a<<11); + a ^= (a>>16); + return a; +} + +static int fons__mini(int a, int b) +{ + return a < b ? a : b; +} + +static int fons__maxi(int a, int b) +{ + return a > b ? a : b; +} + +struct FONSrow +{ + short x,y,h; +}; + +struct FONSglyph +{ + unsigned int codepoint; + int index; + int next; + short size, blur; + short x0,y0,x1,y1; + short xadv,xoff,yoff; +}; + +struct FONSfont +{ + stbtt_fontinfo font; + char name[64]; + unsigned char* data; + int dataSize; + unsigned char freeData; + float ascender; + float descender; + float lineh; + struct FONSglyph* glyphs; + int cglyphs; + int nglyphs; + int lut[FONS_HASH_LUT_SIZE]; +}; + +struct FONSstate +{ + int font; + int align; + float size; + unsigned int color; + float blur; + float spacing; +}; + +struct FONScontext +{ + struct FONSparams params; + float itw,ith; + unsigned char* texData; + int dirtyRect[4]; + struct FONSrow* rows; + int crows; + int nrows; + struct FONSfont** fonts; + int cfonts; + int nfonts; + float verts[FONS_VERTEX_COUNT*2]; + float tcoords[FONS_VERTEX_COUNT*2]; + unsigned int colors[FONS_VERTEX_COUNT]; + int nverts; + unsigned char scratch[FONS_SCRATCH_BUF_SIZE]; + int nscratch; + struct FONSstate states[FONS_MAX_STATES]; + int nstates; +}; + +static void* fons__tmpalloc(size_t size, void* up) +{ + struct FONScontext* stash = (struct FONScontext*)up; + if (stash->nscratch+(int)size > FONS_SCRATCH_BUF_SIZE) + return NULL; + unsigned char* ptr = stash->scratch + stash->nscratch; + stash->nscratch += (int)size; + return ptr; +} + +static void fons__tmpfree(void* ptr, void* up) +{ + // empty +} + +// Copyright (c) 2008-2010 Bjoern Hoehrmann +// See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details. + +#define FONS_UTF8_ACCEPT 0 +#define FONS_UTF8_REJECT 12 + +static unsigned int fons__decutf8(unsigned int* state, unsigned int* codep, unsigned int byte) +{ + static const unsigned char utf8d[] = { + // The first part of the table maps bytes to character classes that + // to reduce the size of the transition table and create bitmasks. + 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, + 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, + 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, + 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, + 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, + 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, + 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, + 10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8, + + // The second part is a transition table that maps a combination + // of a state of the automaton and a character class to a state. + 0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12, + 12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12, + 12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12, + 12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12, + 12,36,12,12,12,12,12,12,12,12,12,12, + }; + + unsigned int type = utf8d[byte]; + + *codep = (*state != FONS_UTF8_ACCEPT) ? + (byte & 0x3fu) | (*codep << 6) : + (0xff >> type) & (byte); + + *state = utf8d[256 + *state + type]; + return *state; +} + +struct FONScontext* fonsCreate(struct FONSparams* params) +{ + struct FONScontext* stash = NULL; + + // Allocate memory for the font stash. + stash = (struct FONScontext*)malloc(sizeof(struct FONScontext)); + if (stash == NULL) goto error; + memset(stash, 0, sizeof(struct FONScontext)); + + stash->params = *params; + + if (stash->params.renderCreate != NULL) + if (stash->params.renderCreate(stash->params.userPtr, stash->params.width, stash->params.height) == 0) goto error; + + // Allocate space for rows + stash->rows = (struct FONSrow*)malloc(sizeof(struct FONSrow) * FONS_INIT_ROWS); + if (stash->rows == NULL) goto error; + memset(stash->rows, 0, sizeof(struct FONSrow) * FONS_INIT_ROWS); + stash->crows = FONS_INIT_ROWS; + stash->nrows = 0; + + // Allocate space for fonts. + stash->fonts = (struct FONSfont**)malloc(sizeof(struct FONSfont*) * FONS_INIT_FONTS); + if (stash->fonts == NULL) goto error; + memset(stash->fonts, 0, sizeof(struct FONSfont*) * FONS_INIT_FONTS); + stash->cfonts = FONS_INIT_FONTS; + stash->nfonts = 0; + + // Create texture for the cache. + stash->itw = 1.0f/stash->params.width; + stash->ith = 1.0f/stash->params.height; + stash->texData = (unsigned char*)malloc(stash->params.width * stash->params.height); + if (stash->texData == NULL) goto error; + memset(stash->texData, 0, stash->params.width * stash->params.height); + + stash->dirtyRect[0] = stash->params.width; + stash->dirtyRect[1] = stash->params.height; + stash->dirtyRect[2] = 0; + stash->dirtyRect[3] = 0; + + fonsPushState(stash); + fonsClearState(stash); + + return stash; + +error: + fonsDelete(stash); + return NULL; +} + +static struct FONSstate* fons__getState(struct FONScontext* stash) +{ + return &stash->states[stash->nstates-1]; +} + +void fonsSetSize(struct FONScontext* stash, float size) +{ + fons__getState(stash)->size = size; +} + +void fonsSetColor(struct FONScontext* stash, unsigned int color) +{ + fons__getState(stash)->color = color; +} + +void fonsSetSpacing(struct FONScontext* stash, float spacing) +{ + fons__getState(stash)->spacing = spacing; +} + +void fonsSetBlur(struct FONScontext* stash, float blur) +{ + fons__getState(stash)->blur = blur; +} + +void fonsSetAlign(struct FONScontext* stash, int align) +{ + fons__getState(stash)->align = align; +} + +void fonsSetFont(struct FONScontext* stash, int font) +{ + fons__getState(stash)->font = font; +} + +void fonsPushState(struct FONScontext* stash) +{ + if (stash->nstates >= FONS_MAX_STATES) + return; + if (stash->nstates > 0) + memcpy(&stash->states[stash->nstates], &stash->states[stash->nstates-1], sizeof(struct FONSstate)); + stash->nstates++; +} + +void fonsPopState(struct FONScontext* stash) +{ + if (stash->nstates <= 1) + return; + stash->nstates--; +} + +void fonsClearState(struct FONScontext* stash) +{ + struct FONSstate* state = fons__getState(stash); + state->size = 12.0f; + state->color = 0xffffffff; + state->font = 0; + state->blur = 0; + state->spacing = 0; + state->align = FONS_ALIGN_LEFT | FONS_ALIGN_BASELINE; +} + + + +int fonsAddFont(struct FONScontext* stash, const char* name, const char* path) +{ + FILE* fp = 0; + int dataSize = 0; + unsigned char* data = NULL; + + // Read in the font data. + fp = fopen(path, "rb"); + if (!fp) goto error; + fseek(fp,0,SEEK_END); + dataSize = (int)ftell(fp); + fseek(fp,0,SEEK_SET); + data = (unsigned char*)malloc(dataSize); + if (data == NULL) goto error; + fread(data, 1, dataSize, fp); + fclose(fp); + fp = 0; + + return fonsAddFontMem(stash, name, data, dataSize, 1); + +error: + if (data) free(data); + if (fp) fclose(fp); + return 0; +} + +static void fons__freeFont(struct FONSfont* font) +{ + if (font == NULL) return; + if (font->glyphs) free(font->glyphs); + if (font->freeData && font->data) free(font->data); + free(font); +} + +static int fons__allocFont(struct FONScontext* stash) +{ + struct FONSfont** fonts = NULL; + struct FONSfont* font = NULL; + if (stash->nfonts+1 > stash->cfonts) { + stash->cfonts *= 2; + fonts = (struct FONSfont**)malloc(sizeof(struct FONSfont*) * stash->cfonts); + if (fonts == NULL) goto error; + memset(fonts, 0, sizeof(struct FONSfont*) * stash->cfonts); + if (stash->nfonts > 0) + memcpy(fonts, stash->fonts, sizeof(struct FONSfont*)); + + free(stash->fonts); + stash->fonts = fonts; + } + font = (struct FONSfont*)malloc(sizeof(struct FONSfont)); + if (font == NULL) goto error; + memset(font, 0, sizeof(struct FONSfont)); + + font->glyphs = (struct FONSglyph*)malloc(sizeof(struct FONSglyph) * FONS_INIT_GLYPHS); + if (font->glyphs == NULL) goto error; + font->cglyphs = FONS_INIT_GLYPHS; + font->nglyphs = 0; + + stash->fonts[stash->nfonts++] = font; + return stash->nfonts-1; + +error: + fons__freeFont(font); + + return FONS_INVALID; +} + +int fonsAddFontMem(struct FONScontext* stash, const char* name, unsigned char* data, int dataSize, int freeData) +{ + int i, ascent, descent, fh, lineGap; + struct FONSfont* font; + + int idx = fons__allocFont(stash); + if (idx == FONS_INVALID) + return FONS_INVALID; + + font = stash->fonts[idx]; + + strncpy(font->name, name, sizeof(font->name)); + font->name[sizeof(font->name)-1] = '\0'; + + // Init hash lookup. + for (i = 0; i < FONS_HASH_LUT_SIZE; ++i) + font->lut[i] = -1; + + // Read in the font data. + font->dataSize = dataSize; + font->data = data; + font->freeData = freeData; + + // Init stb_truetype + stash->nscratch = 0; + font->font.userdata = stash; + if (!stbtt_InitFont(&font->font, font->data, 0)) goto error; + + // Store normalized line height. The real line height is got + // by multiplying the lineh by font size. + stbtt_GetFontVMetrics(&font->font, &ascent, &descent, &lineGap); + fh = ascent - descent; + font->ascender = (float)ascent / (float)fh; + font->descender = (float)descent / (float)fh; + font->lineh = (float)(fh + lineGap) / (float)fh; + + return idx; + +error: + fons__freeFont(font); + stash->nfonts--; + return FONS_INVALID; +} + +int fonsGetFontByName(struct FONScontext* s, const char* name) +{ + int i; + for (i = 0; i < s->nfonts; i++) { + if (strcmp(s->fonts[i]->name, name) == 0) + return i; + } + return FONS_INVALID; +} + +const unsigned char* fonsGetTextureData(struct FONScontext* stash, int* width, int* height) +{ + if (width != NULL) + *width = stash->params.width; + if (height != NULL) + *height = stash->params.height; + return stash->texData; +} + +int fonsValidateTexture(struct FONScontext* stash, int* dirty) +{ + if (stash->dirtyRect[0] < stash->dirtyRect[2] && stash->dirtyRect[1] < stash->dirtyRect[3]) { + dirty[0] = stash->dirtyRect[0]; + dirty[1] = stash->dirtyRect[1]; + dirty[2] = stash->dirtyRect[2]; + dirty[3] = stash->dirtyRect[3]; + // Reset dirty rect + stash->dirtyRect[0] = stash->params.width; + stash->dirtyRect[1] = stash->params.height; + stash->dirtyRect[2] = 0; + stash->dirtyRect[3] = 0; + return 1; + } + return 0; +} + +static struct FONSrow* fons__allocRow(struct FONScontext* stash) +{ + struct FONSrow* rows = NULL; + if (stash->nrows+1 > stash->crows) { + stash->crows *= 2; + rows = (struct FONSrow*)malloc(sizeof(struct FONSrow) * stash->crows); + if (rows == NULL) return NULL; + memset(rows, 0, sizeof(struct FONSrow) * stash->crows); + if (stash->nrows > 0) + memcpy(rows, stash->rows, sizeof(struct FONSrow) * stash->nrows); + free(stash->rows); + stash->rows = rows; + } + stash->nrows++; + return &stash->rows[stash->nrows-1]; +} + +static struct FONSglyph* fons__allocGlyph(struct FONSfont* font) +{ + struct FONSglyph* glyphs = NULL; + if (font->nglyphs+1 > font->cglyphs) { + font->cglyphs *= 2; + glyphs = (struct FONSglyph*)malloc(sizeof(struct FONSglyph) * font->cglyphs); + if (glyphs == NULL) return NULL; + memset(glyphs, 0, sizeof(struct FONSglyph) * font->cglyphs); + if (font->nglyphs > 0) + memcpy(glyphs, font->glyphs, sizeof(struct FONSglyph) * font->nglyphs); + free(font->glyphs); + font->glyphs = glyphs; + } + font->nglyphs++; + return &font->glyphs[font->nglyphs-1]; +} + +static int fons__clamp(int a, int amin, int amax) { return a < amin ? amin : (a > amax ? amax : a); } + +static void fons__hblur(unsigned char* dst, int dstStride, unsigned char* src, int srcStride, + int w, int h, int blur, unsigned short* idx) +{ + int x,y,acc; + int d = 1 + 2*blur; + int w1 = w-1; + idx += blur; + + for (x = -blur; x <= w+blur; x++) { + idx[x] = fons__clamp(x,0,w1); + } + + for (y = 0; y < h; y++) { + // warm up accumulator + acc = 0; + for (x = -blur; x < blur; x++) + acc += src[idx[x]]; + for (x = 0; x < w; x++) { + acc += src[idx[x+blur]]; + dst[x] = (unsigned char)(acc / d); + acc -= src[idx[x-blur]]; + } + src += srcStride; + dst += dstStride; + } + +} + +static void fons__vblur(unsigned char* dst, int dstStride, unsigned char* src, int srcStride, + int w, int h, int blur, unsigned short* idx) +{ + int x,y,acc; + int d = 1 + 2*blur; + int h1 = h-1; + idx += blur; + + for (y = -blur; y <= h+blur; y++) + idx[y] = fons__clamp(y,0,h1) * srcStride; + + for (x = 0; x < w; x++) { + // warm up accumulator + acc = 0; + for (y = -blur; y < blur; y++) + acc += src[idx[y]]; + for (y = 0; y < h; y++) { + acc += src[idx[y+blur]]; + dst[y*dstStride] = (unsigned char)(acc / d); + acc -= src[idx[y-blur]]; + } + src++; + dst++; + } +} + +static void fons__blur(struct FONScontext* stash, unsigned char* dst, int w, int h, int dstStride, int blur) +{ + // It is possible that our scratch is too small for blurring (16k scratch can handle about 120x120 blur). + int bufStride = w; + unsigned short* idx; + unsigned char* buf; + buf = (unsigned char*)fons__tmpalloc(w*h, stash); + if (buf == NULL) { + return; + } + idx = (unsigned short*)fons__tmpalloc((1+2*blur+fons__maxi(w,h))*sizeof(unsigned short), stash); + if (idx == NULL) { + return; + } + + // Tent. + int b1 = (blur+1)/2, b2 = blur-b1; + fons__hblur(buf,bufStride, dst,dstStride, w,h, b1, idx); + fons__vblur(dst,dstStride, buf,bufStride, w,h, b1, idx); + if (b2 > 0) { + fons__hblur(buf,bufStride, dst,dstStride, w,h, b2, idx); + fons__vblur(dst,dstStride, buf,bufStride, w,h, b2, idx); + } +} + + +static struct FONSglyph* fons__getGlyph(struct FONScontext* stash, struct FONSfont* font, unsigned int codepoint, + short isize, short iblur) +{ + int i, g, advance, lsb, x0, y0, x1, y1, gw, gh; + float scale; + struct FONSglyph* glyph = NULL; + unsigned int h; + float size = isize/10.0f; + int rh, pad, x, y; + struct FONSrow* br; + unsigned char* dst; + + if (isize < 2) return NULL; + if (iblur > 20) iblur = 20; + pad = iblur+2; + + // Reset allocator. + stash->nscratch = 0; + + // Find code point and size. + h = fons__hashint(codepoint) & (FONS_HASH_LUT_SIZE-1); + i = font->lut[h]; + while (i != -1) { + if (font->glyphs[i].codepoint == codepoint && font->glyphs[i].size == isize && font->glyphs[i].blur == iblur) + return &font->glyphs[i]; + i = font->glyphs[i].next; + } + + // Could not find glyph, create it. + scale = stbtt_ScaleForPixelHeight(&font->font, size); + g = stbtt_FindGlyphIndex(&font->font, codepoint); + stbtt_GetGlyphHMetrics(&font->font, g, &advance, &lsb); + stbtt_GetGlyphBitmapBox(&font->font, g, scale,scale, &x0,&y0,&x1,&y1); + gw = x1-x0 + pad*2; + gh = y1-y0 + pad*2; + + // Find row where the glyph can be fit. + br = NULL; + rh = (gh+7) & ~7; + for (i = 0; i < stash->nrows; ++i) { + int rmax = stash->rows[i].h, rmin = rmax - rmax/4; + if (rh >= rmin && rh <= rmax && (stash->rows[i].x+gw) <= stash->params.width) { + br = &stash->rows[i]; + break; + } + } + + // If no row found, add new. + if (br == NULL) { + short py = 0; + // Check that there is enough space. + if (stash->nrows > 0) { + py = stash->rows[stash->nrows-1].y + stash->rows[stash->nrows-1].h; + if (py+rh > stash->params.height) + return NULL; + } + // Init and add row + br = fons__allocRow(stash); + if (br == NULL) + return NULL; + br->x = 0; + br->y = py; + br->h = rh; + } + + // Init glyph. + glyph = fons__allocGlyph(font); + glyph->codepoint = codepoint; + glyph->size = isize; + glyph->blur = iblur; + glyph->index = g; + glyph->x0 = br->x; + glyph->y0 = br->y; + glyph->x1 = glyph->x0+gw; + glyph->y1 = glyph->y0+gh; + glyph->xadv = (short)(scale * advance * 10.0f); + glyph->xoff = x0 - pad; + glyph->yoff = y0 - pad; + glyph->next = 0; + + // Advance row location. + br->x += gw+1; + + // Insert char to hash lookup. + glyph->next = font->lut[h]; + font->lut[h] = font->nglyphs-1; + + // Rasterize + dst = &stash->texData[(glyph->x0+pad) + (glyph->y0+pad) * stash->params.width]; + stbtt_MakeGlyphBitmap(&font->font, dst, gw-pad*2,gh-pad*2, stash->params.width, scale,scale, g); + + // Make sure there is one pixel empty border. + dst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width]; + for (y = 0; y < gh; y++) { + dst[y*stash->params.width] = 0; + dst[gw-1 + y*stash->params.width] = 0; + } + for (x = 0; x < gw; x++) { + dst[x] = 0; + dst[x + (gh-1)*stash->params.width] = 0; + } + + // Debug code to color the glyph background +/* dst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width]; + for (y = 0; y < gh; y++) { + for (x = 0; x < gw; x++) { + int a = (int)dst[x+y*stash->params.width] + 20; + if (a > 255) a = 255; + dst[x+y*stash->params.width] = a; + } + }*/ + + // Blur + if (iblur > 0) { + stash->nscratch = 0; + dst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width]; + fons__blur(stash, dst, gw,gh, stash->params.width, iblur); + } + + stash->dirtyRect[0] = fons__mini(stash->dirtyRect[0], fons__maxi(0, glyph->x0-1)); + stash->dirtyRect[1] = fons__mini(stash->dirtyRect[1], fons__maxi(0, glyph->y0-1)); + stash->dirtyRect[2] = fons__maxi(stash->dirtyRect[2], fons__mini(glyph->x1+1, stash->params.width)); + stash->dirtyRect[3] = fons__maxi(stash->dirtyRect[3], fons__mini(glyph->y1+1, stash->params.height)); + + return glyph; +} + +static void fons__getQuad(struct FONScontext* stash, struct FONSfont* font, + struct FONSglyph* prevGlyph, struct FONSglyph* glyph, + float scale, float spacing, float* x, float* y, struct FONSquad* q) +{ + int rx,ry,xoff,yoff,x0,y0,x1,y1; + if (prevGlyph) { + float adv = stbtt_GetGlyphKernAdvance(&font->font, prevGlyph->index, glyph->index) * scale; + *x += (int)(adv+0.5f); + } + + // Each glyph has 2px border to allow good interpolation, + // one pixel to prevent leaking, and one to allow good interpolation for rendering. + // Inset the texture region by one pixel for corret interpolation. + xoff = glyph->xoff+1; + yoff = glyph->yoff+1; + x0 = glyph->x0+1; + y0 = glyph->y0+1; + x1 = glyph->x1-1; + y1 = glyph->y1-1; + + if (stash->params.flags & FONS_ZERO_TOPLEFT) { + rx = (int)(*x + xoff); + ry = (int)(*y + yoff); + + q->x0 = rx; + q->y0 = ry; + q->x1 = rx + x1 - x0; + q->y1 = ry + y1 - y0; + + q->s0 = x0 * stash->itw; + q->t0 = y0 * stash->ith; + q->s1 = x1 * stash->itw; + q->t1 = y1 * stash->ith; + } else { + rx = (int)(*x + xoff); + ry = (int)(*y - yoff); + + q->x0 = rx; + q->y0 = ry; + q->x1 = rx + x1 - x0; + q->y1 = ry - y1 + y0; + + q->s0 = x0 * stash->itw; + q->t0 = y0 * stash->ith; + q->s1 = x1 * stash->itw; + q->t1 = y1 * stash->ith; + } + + *x += (int)(glyph->xadv / 10.0f + spacing + 0.5f); +} + +static void fons__flush(struct FONScontext* stash) +{ + // Flush texture + if (stash->dirtyRect[0] < stash->dirtyRect[2] && stash->dirtyRect[1] < stash->dirtyRect[3]) { + if (stash->params.renderUpdate != NULL) + stash->params.renderUpdate(stash->params.userPtr, stash->dirtyRect, stash->texData); + // Reset dirty rect + stash->dirtyRect[0] = stash->params.width; + stash->dirtyRect[1] = stash->params.height; + stash->dirtyRect[2] = 0; + stash->dirtyRect[3] = 0; + } + + // Flush triangles + if (stash->nverts > 0) { + if (stash->params.renderDraw != NULL) + stash->params.renderDraw(stash->params.userPtr, stash->verts, stash->tcoords, stash->colors, stash->nverts); + stash->nverts = 0; + } +} + +static inline void fons__vertex(struct FONScontext* stash, float x, float y, float s, float t, unsigned int c) +{ + stash->verts[stash->nverts*2+0] = x; + stash->verts[stash->nverts*2+1] = y; + stash->tcoords[stash->nverts*2+0] = s; + stash->tcoords[stash->nverts*2+1] = t; + stash->colors[stash->nverts] = c; + stash->nverts++; +} + +static float fons__getVertAlign(struct FONScontext* stash, struct FONSfont* font, int align, short isize) +{ + if (stash->params.flags & FONS_ZERO_TOPLEFT) { + if (align & FONS_ALIGN_TOP) { + return font->ascender * (float)isize/10.0f; + } else if (align & FONS_ALIGN_MIDDLE) { + return (font->ascender + font->descender) / 2.0f * (float)isize/10.0f; + } else if (align & FONS_ALIGN_BASELINE) { + return 0.0f; + } else if (align & FONS_ALIGN_BOTTOM) { + return font->descender * (float)isize/10.0f; + } + } else { + if (align & FONS_ALIGN_TOP) { + return -font->ascender * (float)isize/10.0f; + } else if (align & FONS_ALIGN_MIDDLE) { + return -(font->ascender + font->descender) / 2.0f * (float)isize/10.0f; + } else if (align & FONS_ALIGN_BASELINE) { + return 0.0f; + } else if (align & FONS_ALIGN_BOTTOM) { + return -font->descender * (float)isize/10.0f; + } + } + return 0.0; +} + +void fonsDrawText(struct FONScontext* stash, + float x, float y, + const char* s, float* dx) +{ + struct FONSstate* state = fons__getState(stash); + unsigned int codepoint; + unsigned int utf8state = 0; + struct FONSglyph* glyph = NULL; + struct FONSglyph* prevGlyph = NULL; + struct FONSquad q; + short isize = (short)(state->size*10.0f); + short iblur = (short)state->blur; + float scale; + struct FONSfont* font; + + if (stash == NULL) return; + if (state->font < 0 || state->font >= stash->nfonts) return; + font = stash->fonts[state->font]; + if (!font->data) return; + + scale = stbtt_ScaleForPixelHeight(&font->font, (float)isize/10.0f); + + float width; + // Align horizontally + if (state->align & FONS_ALIGN_LEFT) { + // empty + } else if (state->align & FONS_ALIGN_RIGHT) { + fonsTextBounds(stash, s, &width, NULL); + x -= width; + } else if (state->align & FONS_ALIGN_CENTER) { + fonsTextBounds(stash, s, &width, NULL); + x -= width * 0.5f; + } + // Align vertically. + y += fons__getVertAlign(stash, font, state->align, isize); + + for (; *s; ++s) { + if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)s)) + continue; + glyph = fons__getGlyph(stash, font, codepoint, isize, iblur); + if (glyph != NULL) { + fons__getQuad(stash, font, prevGlyph, glyph, scale, state->spacing, &x, &y, &q); + + if (stash->nverts+6 > FONS_VERTEX_COUNT) + fons__flush(stash); + + fons__vertex(stash, q.x0, q.y0, q.s0, q.t0, state->color); + fons__vertex(stash, q.x1, q.y1, q.s1, q.t1, state->color); + fons__vertex(stash, q.x1, q.y0, q.s1, q.t0, state->color); + + fons__vertex(stash, q.x0, q.y0, q.s0, q.t0, state->color); + fons__vertex(stash, q.x0, q.y1, q.s0, q.t1, state->color); + fons__vertex(stash, q.x1, q.y1, q.s1, q.t1, state->color); + } + prevGlyph = glyph; + } + fons__flush(stash); + if (dx) *dx = x; +} + +int fonsTextIterInit(struct FONScontext* stash, struct FONStextIter* iter, + float x, float y, const char* s) +{ + struct FONSstate* state = fons__getState(stash); + float width; + + memset(iter, 0, sizeof(*iter)); + + if (stash == NULL) return 0; + if (state->font < 0 || state->font >= stash->nfonts) return 0; + iter->font = stash->fonts[state->font]; + if (!iter->font->data) return 0; + + iter->isize = (short)(state->size*10.0f); + iter->iblur = (short)state->blur; + iter->scale = stbtt_ScaleForPixelHeight(&iter->font->font, (float)iter->isize/10.0f); + + // Align horizontally + if (state->align & FONS_ALIGN_LEFT) { + // empty + } else if (state->align & FONS_ALIGN_RIGHT) { + fonsTextBounds(stash, s, &width, NULL); + x -= width; + } else if (state->align & FONS_ALIGN_CENTER) { + fonsTextBounds(stash, s, &width, NULL); + x -= width * 0.5f; + } + // Align vertically. + y += fons__getVertAlign(stash, iter->font, state->align, iter->isize); + + iter->x = x; + iter->y = y; + iter->spacing = state->spacing; + iter->str = s; + + return 1; +} + +int fonsTextIterNext(struct FONScontext* stash, struct FONStextIter* iter, struct FONSquad* quad) +{ + struct FONSglyph* glyph = NULL; + unsigned int codepoint = 0; + const char* s = iter->str; + + if (*s == '\0') + return 0; + + for (; *s; s++) { + if (fons__decutf8(&iter->utf8state, &codepoint, *(const unsigned char*)s)) + continue; + s++; + +// printf("%c", codepoint); + + // Get glyph and quad + glyph = fons__getGlyph(stash, iter->font, codepoint, iter->isize, iter->iblur); + if (glyph != NULL) + fons__getQuad(stash, iter->font, iter->prevGlyph, glyph, iter->scale, iter->spacing, &iter->x, &iter->y, quad); + iter->prevGlyph = glyph; + break; + } + iter->str = s; + + return 1; +} + +void fonsDrawDebug(struct FONScontext* stash, float x, float y) +{ + int w = stash->params.width; + int h = stash->params.height; + if (stash->nverts+6 > FONS_VERTEX_COUNT) + fons__flush(stash); + + fons__vertex(stash, x+0, y+0, 0, 0, 0xffffffff); + fons__vertex(stash, x+w, y+h, 1, 1, 0xffffffff); + fons__vertex(stash, x+w, y+0, 1, 0, 0xffffffff); + + fons__vertex(stash, x+0, y+0, 0, 0, 0xffffffff); + fons__vertex(stash, x+0, y+h, 0, 1, 0xffffffff); + fons__vertex(stash, x+w, y+h, 1, 1, 0xffffffff); + + fons__flush(stash); +} + +void fonsTextBounds(struct FONScontext* stash, + const char* s, + float* width, float* bounds) +{ + struct FONSstate* state = fons__getState(stash); + unsigned int codepoint; + unsigned int utf8state = 0; + struct FONSquad q; + struct FONSglyph* glyph = NULL; + struct FONSglyph* prevGlyph = NULL; + short isize = (short)(state->size*10.0f); + short iblur = (short)state->blur; + float scale; + struct FONSfont* font; + float x = 0, y = 0, minx, miny, maxx, maxy; + + if (stash == NULL) return; + if (state->font < 0 || state->font >= stash->nfonts) return; + font = stash->fonts[state->font]; + if (!font->data) return; + + scale = stbtt_ScaleForPixelHeight(&font->font, (float)isize/10.0f); + + // Align vertically. + y += fons__getVertAlign(stash, font, state->align, isize); + + minx = maxx = x; + miny = maxy = y; + + for (; *s; ++s) { + if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)s)) + continue; + glyph = fons__getGlyph(stash, font, codepoint, isize, iblur); + if (glyph) { + fons__getQuad(stash, font, prevGlyph, glyph, scale, state->spacing, &x, &y, &q); + 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; + } + prevGlyph = glyph; + } + if (width) { + *width = x; + } + + // Align horizontally + if (state->align & FONS_ALIGN_LEFT) { + // empty + } else if (state->align & FONS_ALIGN_RIGHT) { + minx -= x; + maxx -= x; + } else if (state->align & FONS_ALIGN_CENTER) { + minx -= x * 0.5f; + maxx -= x * 0.5f; + } + + if (bounds) { + bounds[0] = minx; + bounds[1] = miny; + bounds[2] = maxx; + bounds[3] = maxy; + } +} + +void fonsVertMetrics(struct FONScontext* stash, + float* ascender, float* descender, float* lineh) +{ + struct FONSstate* state = fons__getState(stash); + if (stash == NULL) return; + if (state->font < 0 || state->font >= stash->nfonts) return; + struct FONSfont* font = stash->fonts[state->font]; + short isize = (short)(state->size*10.0f); + if (!font->data) return; + + if (ascender) + *ascender = font->ascender*isize/10.0f; + if (descender) + *descender = font->descender*isize/10.0f; + if (lineh) + *lineh = font->lineh*isize/10.0f; +} + +void fonsDelete(struct FONScontext* stash) +{ + int i; + if (stash == NULL) return; + + if (stash->params.renderDelete != NULL) + stash->params.renderDelete(stash->params.userPtr); + + for (i = 0; i < stash->nfonts; ++i) + fons__freeFont(stash->fonts[i]); + + if (stash->fonts) free(stash->fonts); + if (stash->rows) free(stash->rows); + if (stash->texData) free(stash->texData); + free(stash); +} + +#endif diff --git a/src/glnanovg.h b/src/glnanovg.h new file mode 100644 index 0000000..7d7e63e --- /dev/null +++ b/src/glnanovg.h @@ -0,0 +1,690 @@ +// +// Copyright (c) 2009-2013 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 GLNANOVG_H +#define GLNANOVG_H + +struct NVGcontext* glnvgCreate(); +void glnvgDelete(struct NVGcontext* ctx); + +#endif + +#ifdef GLNANOVG_IMPLEMENTATION + +#include +#include "nanovg.h" + +enum GLNVGuniformLoc { + GLNVG_LOC_SCISSORMAT, + GLNVG_LOC_SCISSOREXT, + GLNVG_LOC_PAINTMAT, + GLNVG_LOC_EXTENT, + GLNVG_LOC_RADIUS, + GLNVG_LOC_FEATHER, + GLNVG_LOC_INNERCOL, + GLNVG_LOC_OUTERCOL, + GLNVG_LOC_STROKEMULT, + GLNVG_LOC_TEX, + GLNVG_MAX_LOCS +}; + +struct GLNVGshader { + GLuint prog; + GLuint frag; + GLuint vert; + GLint loc[GLNVG_MAX_LOCS]; +}; + +struct GLNVGtexture { + int id; + GLuint tex; + int width, height; + int type; +}; + +struct GLNVGcontext { + struct GLNVGshader gradShader; + struct GLNVGshader imgShader; + struct GLNVGtexture* textures; + int ntextures; + int ctextures; + int textureId; +}; + +static struct GLNVGtexture* glnvg__allocTexture(struct GLNVGcontext* gl) +{ + struct GLNVGtexture* tex = NULL; + int i; + + for (i = 0; i < gl->ntextures; i++) { + if (gl->textures[i].id == 0) { + tex = &gl->textures[i]; + break; + } + } + if (tex == NULL) { + if (gl->ntextures+1 > gl->ctextures) { + gl->ctextures = (gl->ctextures == 0) ? 2 : gl->ctextures*2; + gl->textures = (struct GLNVGtexture*)realloc(gl->textures, sizeof(struct GLNVGtexture)*gl->ctextures); + if (gl->textures == NULL) return NULL; + } + tex = &gl->textures[gl->ntextures++]; + } + + memset(tex, 0, sizeof(*tex)); + tex->id = ++gl->textureId; + + return tex; +} + +static struct GLNVGtexture* glnvg__findTexture(struct GLNVGcontext* gl, int id) +{ + int i; + for (i = 0; i < gl->ntextures; i++) + if (gl->textures[i].id == id) + return &gl->textures[i]; + return NULL; +} + +static int glnvg__deleteTexture(struct GLNVGcontext* gl, int id) +{ + int i; + for (i = 0; i < gl->ntextures; i++) { + if (gl->textures[i].id == id) { + if (gl->textures[i].tex != 0) + glDeleteTextures(1, &gl->textures[i].tex); + memset(&gl->textures[i], 0, sizeof(gl->textures[i])); + return 1; + } + } + return 0; +} + +static void glnvg__dumpShaderError(GLuint shader, const char* name, const char* type) +{ + char str[512+1]; + int len = 0; + glGetShaderInfoLog(shader, 512, &len, str); + if (len > 512) len = 512; + str[len] = '\0'; + printf("Shader %s/%s error:\n%s\n", name, type, str); +} + +static void glnvg__dumpProgramError(GLuint prog, const char* name) +{ + char str[512+1]; + int len = 0; + glGetProgramInfoLog(prog, 512, &len, str); + if (len > 512) len = 512; + str[len] = '\0'; + printf("Program %s error:\n%s\n", name, str); +} + +static void glnvg__checkError(const char* str) +{ + GLenum err = glGetError(); + if (err != GL_NO_ERROR) { + printf("Error %08x after %s\n", err, str); + } +} + +static int glnvg__createShader(struct GLNVGshader* shader, const char* name, const char* vshader, const char* fshader) +{ + GLint status; + GLuint prog, vert, frag; + + memset(shader, 0, sizeof(*shader)); + + prog = glCreateProgram(); + vert = glCreateShader(GL_VERTEX_SHADER); + frag = glCreateShader(GL_FRAGMENT_SHADER); + glShaderSource(vert, 1, &vshader, 0); + glShaderSource(frag, 1, &fshader, 0); + + glCompileShader(vert); + glGetShaderiv(vert, GL_COMPILE_STATUS, &status); + if (status != GL_TRUE) { + glnvg__dumpShaderError(vert, name, "vert"); + return 0; + } + + glCompileShader(frag); + glGetShaderiv(frag, GL_COMPILE_STATUS, &status); + if (status != GL_TRUE) { + glnvg__dumpShaderError(frag, name, "frag"); + return 0; + } + + glAttachShader(prog, vert); + glAttachShader(prog, frag); + glLinkProgram(prog); + glGetProgramiv(prog, GL_LINK_STATUS, &status); + if (status != GL_TRUE) { + glnvg__dumpProgramError(prog, name); + return 0; + } + + shader->prog = prog; + shader->vert = vert; + shader->frag = frag; + + return 1; +} + +static void glnvg__deleteShader(struct GLNVGshader* shader) +{ + if (shader->prog != 0) + glDeleteProgram(shader->prog); + if (shader->vert != 0) + glDeleteShader(shader->vert); + if (shader->frag != 0) + glDeleteShader(shader->frag); +} + +static int glnvg__renderCreate(void* uptr) +{ + struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr; + + static const char* fillVertShader = + "#version 120\n" + "varying vec2 pos;\n" + "varying vec2 alpha;\n" + "void main(void) {\n" + " alpha = gl_MultiTexCoord0.st;" + " pos = gl_Vertex.xy;\n" + " gl_Position = ftransform();\n" + "}\n"; + + static const char* fillFragGradShader = + "#version 120\n" + "uniform mat3 scissorMat;\n" + "uniform vec2 scissorExt;\n" + "uniform mat3 paintMat;\n" + "uniform vec2 extent;\n" + "uniform float radius;\n" + "uniform float feather;\n" + "uniform vec4 innerCol;\n" + "uniform vec4 outerCol;\n" + "uniform float strokeMult;\n" + "varying vec2 pos;\n" + "varying vec2 alpha;\n" + "float sdroundrect(vec2 pt, vec2 ext, float rad) {\n" + " vec2 ext2 = ext - vec2(rad,rad);\n" + " vec2 d = abs(pt) - ext2;\n" + " return min(max(d.x,d.y),0.0) + length(max(d,0.0)) - rad;\n" + "}\n" + "void main(void) {\n" + " // Scissoring\n" + " vec2 sc = vec2(0.5,0.5) - (abs((scissorMat * vec3(pos,1.0)).xy) - scissorExt);\n" + " float scissor = clamp(sc.x,0.0,1.0) * clamp(sc.y,0.0,1.0);\n" +// " if (scissor < 0.001) discard;\n" + " // Stroke - from [0..1] to clipped pyramid, where the slope is 1px.\n" + " float strokeAlpha = min(1.0, (1.0-abs(alpha.x*2.0-1.0))*strokeMult) * alpha.y;\n" + " // Calculate gradient color using box gradient\n" + " vec2 pt = (paintMat * vec3(pos,1.0)).xy;\n" + " float d = clamp((sdroundrect(pt, extent, radius) + feather*0.5) / feather, 0.0, 1.0);\n" + " vec4 color = mix(innerCol,outerCol,d);\n" + " // Combine alpha\n" + " color.w *= strokeAlpha * scissor;\n" + " gl_FragColor = color;\n" + "}\n"; + + static const char* fillFragImgShader = + "#version 120\n" + "uniform mat3 scissorMat;\n" + "uniform vec2 scissorExt;\n" + "uniform mat3 paintMat;\n" + "uniform vec2 extent;\n" + "uniform float strokeMult;\n" + "uniform sampler2D tex;\n" + "varying vec2 pos;\n" + "varying vec2 alpha;\n" + "void main(void) {\n" + " // Scissoring\n" + " vec2 sc = vec2(0.5,0.5) - (abs((scissorMat * vec3(pos,1.0)).xy) - scissorExt);\n" + " float scissor = clamp(sc.x,0.0,1.0) * clamp(sc.y,0.0,1.0);\n" +// " if (scissor < 0.001) discard;\n" + " // Stroke - from [0..1] to clipped pyramid, where the slope is 1px.\n" + " float strokeAlpha = min(1.0, (1.0-abs(alpha.x*2.0-1.0))*strokeMult) * alpha.y;\n" + " // Calculate color fron texture\n" + " vec2 pt = (paintMat * vec3(pos,1.0)).xy;\n" + " pt /= extent;\n" + " vec4 color = texture2D(tex, pt);\n" + " // Combine alpha\n" + " color.w *= strokeAlpha * scissor;\n" + " gl_FragColor = color;\n" + "}\n"; + + glnvg__checkError("init"); + + if (glnvg__createShader(&gl->gradShader, "grad", fillVertShader, fillFragGradShader) == 0) + return 0; + + glnvg__checkError("grad"); + + gl->gradShader.loc[GLNVG_LOC_SCISSORMAT] = glGetUniformLocation(gl->gradShader.prog, "scissorMat"); + gl->gradShader.loc[GLNVG_LOC_SCISSOREXT] = glGetUniformLocation(gl->gradShader.prog, "scissorExt"); + gl->gradShader.loc[GLNVG_LOC_PAINTMAT] = glGetUniformLocation(gl->gradShader.prog, "paintMat"); + gl->gradShader.loc[GLNVG_LOC_EXTENT] = glGetUniformLocation(gl->gradShader.prog, "extent"); + gl->gradShader.loc[GLNVG_LOC_RADIUS] = glGetUniformLocation(gl->gradShader.prog, "radius"); + gl->gradShader.loc[GLNVG_LOC_FEATHER] = glGetUniformLocation(gl->gradShader.prog, "feather"); + gl->gradShader.loc[GLNVG_LOC_INNERCOL] = glGetUniformLocation(gl->gradShader.prog, "innerCol"); + gl->gradShader.loc[GLNVG_LOC_OUTERCOL] = glGetUniformLocation(gl->gradShader.prog, "outerCol"); + gl->gradShader.loc[GLNVG_LOC_STROKEMULT] = glGetUniformLocation(gl->gradShader.prog, "strokeMult"); + + glnvg__checkError("grad loc"); + + if (glnvg__createShader(&gl->imgShader, "image", fillVertShader, fillFragImgShader) == 0) + return 0; + + glnvg__checkError("image"); + + gl->imgShader.loc[GLNVG_LOC_SCISSORMAT] = glGetUniformLocation(gl->imgShader.prog, "scissorMat"); + gl->imgShader.loc[GLNVG_LOC_SCISSOREXT] = glGetUniformLocation(gl->imgShader.prog, "scissorExt"); + gl->imgShader.loc[GLNVG_LOC_PAINTMAT] = glGetUniformLocation(gl->imgShader.prog, "paintMat"); + gl->imgShader.loc[GLNVG_LOC_EXTENT] = glGetUniformLocation(gl->imgShader.prog, "extent"); +// gl->gradShader.loc[GLNVG_LOC_RADIUS] = glGetUniformLocation(gl->gradShader.prog, "radius"); +// gl->gradShader.loc[GLNVG_LOC_FEATHER] = glGetUniformLocation(gl->gradShader.prog, "feather"); +// gl->gradShader.loc[GLNVG_LOC_INNERCOL] = glGetUniformLocation(gl->gradShader.prog, "innerCol"); +// gl->gradShader.loc[GLNVG_LOC_OUTERCOL] = glGetUniformLocation(gl->gradShader.prog, "outerCol"); + gl->imgShader.loc[GLNVG_LOC_STROKEMULT] = glGetUniformLocation(gl->imgShader.prog, "strokeMult"); + gl->imgShader.loc[GLNVG_LOC_TEX] = glGetUniformLocation(gl->imgShader.prog, "tex"); + + glnvg__checkError("image loc"); + + return 1; +} + +static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, const unsigned char* data) +{ + struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr; + struct GLNVGtexture* tex = glnvg__allocTexture(gl); + if (tex == NULL) return 0; + glGenTextures(1, &tex->tex); + tex->width = w; + tex->height = h; + tex->type = type; + glBindTexture(GL_TEXTURE_2D, tex->tex); + + glPixelStorei(GL_UNPACK_ALIGNMENT,1); + glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width); + glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0); + glPixelStorei(GL_UNPACK_SKIP_ROWS, 0); + + if (type == NVG_TEXTURE_RGBA) + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data); + else + glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, w, h, 0, GL_ALPHA, GL_UNSIGNED_BYTE, data); + + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + + glnvg__checkError("create tex"); + + return tex->id; +} + +static int glnvg__renderDeleteTexture(void* uptr, int image) +{ + struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr; + return glnvg__deleteTexture(gl, image); +} + +static int glnvg__renderUpdateTexture(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data) +{ + struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr; + struct GLNVGtexture* tex = glnvg__findTexture(gl, image); + if (tex == NULL) return 0; + glBindTexture(GL_TEXTURE_2D, tex->tex); + + glPixelStorei(GL_UNPACK_ALIGNMENT,1); + glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width); + glPixelStorei(GL_UNPACK_SKIP_PIXELS, x); + glPixelStorei(GL_UNPACK_SKIP_ROWS, y); + + if (tex->type == NVG_TEXTURE_RGBA) + glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RGBA, GL_UNSIGNED_BYTE, data); + else + glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_ALPHA, GL_UNSIGNED_BYTE, data); + + return 1; +} + +static int glnvg__renderGetTextureSize(void* uptr, int image, int* w, int* h) +{ + struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr; + struct GLNVGtexture* tex = glnvg__findTexture(gl, image); + if (tex == NULL) return 0; + *w = tex->width; + *h = tex->height; + return 1; +} + +static void glnvg__toFloatColor(float* fc, unsigned int c) +{ + fc[0] = ((c) & 0xff) / 255.0f; + fc[1] = ((c>>8) & 0xff) / 255.0f; + fc[2] = ((c>>16) & 0xff) / 255.0f; + fc[3] = ((c>>24) & 0xff) / 255.0f; +} + +static void glnvg__xformIdentity(float* t) +{ + t[0] = 1.0f; t[1] = 0.0f; + t[2] = 0.0f; t[3] = 1.0f; + t[4] = 0.0f; t[5] = 0.0f; +} + +static void glnvg__xformInverse(float* inv, float* t) +{ + double det = (double)t[0] * t[3] - (double)t[2] * t[1]; + if (det > -1e-6 && det < -1e-6) { + glnvg__xformIdentity(t); + return; + } + double invdet = 1.0 / det; + inv[0] = (float)(t[3] * invdet); + inv[2] = (float)(-t[2] * invdet); + inv[4] = (float)(((double)t[2] * t[5] - (double)t[3] * t[4]) * invdet); + inv[1] = (float)(-t[1] * invdet); + inv[3] = (float)(t[0] * invdet); + inv[5] = (float)(((double)t[1] * t[4] - (double)t[0] * t[5]) * invdet); +} + +static void glnvg__xformToMat3x3(float* m3, float* t) +{ + m3[0] = t[0]; + m3[1] = t[1]; + m3[2] = 0.0f; + m3[3] = t[2]; + m3[4] = t[3]; + m3[5] = 0.0f; + m3[6] = t[4]; + m3[7] = t[5]; + m3[8] = 1.0f; +} + +static int glnvg__setupPaint(struct GLNVGcontext* gl, struct NVGpaint* paint, struct NVGscissor* scissor, + float width, float aasize) +{ + float innerCol[4]; + float outerCol[4]; + glnvg__toFloatColor(innerCol, paint->innerColor); + glnvg__toFloatColor(outerCol, paint->outerColor); + struct GLNVGtexture* tex = NULL; + float invxform[6], paintMat[9], scissorMat[9]; + float scissorx = 0, scissory = 0; + + glnvg__xformInverse(invxform, paint->xform); + glnvg__xformToMat3x3(paintMat, invxform); + + if (scissor->extent[0] < 0.5f || scissor->extent[1] < 0.5f) { + memset(scissorMat, 0, sizeof(scissorMat)); + scissorx = 1.0f; + scissory = 1.0f; + } else { + glnvg__xformInverse(invxform, scissor->xform); + glnvg__xformToMat3x3(scissorMat, invxform); + scissorx = scissor->extent[0]; + scissory = scissor->extent[1]; + } + + if (paint->image != 0) { + tex = glnvg__findTexture(gl, paint->image); + if (tex == NULL) return 0; + glUseProgram(gl->imgShader.prog); + glUniformMatrix3fv(gl->imgShader.loc[GLNVG_LOC_SCISSORMAT], 1, GL_FALSE, scissorMat); + glUniform2f(gl->imgShader.loc[GLNVG_LOC_SCISSOREXT], scissorx, scissory); + glUniformMatrix3fv(gl->imgShader.loc[GLNVG_LOC_PAINTMAT], 1, GL_FALSE, paintMat); + glUniform2f(gl->imgShader.loc[GLNVG_LOC_EXTENT], paint->extent[0], paint->extent[1]); + glUniform1f(gl->imgShader.loc[GLNVG_LOC_STROKEMULT], width*0.5f + aasize*0.5f); + glUniform1i(gl->imgShader.loc[GLNVG_LOC_TEX], 0); + + glnvg__checkError("tex paint loc"); + + glBindTexture(GL_TEXTURE_2D, tex->tex); + glEnable(GL_TEXTURE_2D); + + glnvg__checkError("tex paint tex"); + + } else { + glUseProgram(gl->gradShader.prog); + glUniformMatrix3fv(gl->gradShader.loc[GLNVG_LOC_SCISSORMAT], 1, GL_FALSE, scissorMat); + glUniform2f(gl->gradShader.loc[GLNVG_LOC_SCISSOREXT], scissorx, scissory); + glUniformMatrix3fv(gl->gradShader.loc[GLNVG_LOC_PAINTMAT], 1, GL_FALSE, paintMat); + glUniform2f(gl->gradShader.loc[GLNVG_LOC_EXTENT], paint->extent[0], paint->extent[1]); + glUniform1f(gl->gradShader.loc[GLNVG_LOC_RADIUS], paint->radius); + glUniform1f(gl->gradShader.loc[GLNVG_LOC_FEATHER], paint->feather); + glUniform4fv(gl->gradShader.loc[GLNVG_LOC_INNERCOL], 1, innerCol); + glUniform4fv(gl->gradShader.loc[GLNVG_LOC_OUTERCOL], 1, outerCol); + glUniform1f(gl->gradShader.loc[GLNVG_LOC_STROKEMULT], width*0.5f + aasize*0.5f); + + glnvg__checkError("grad paint loc"); + } + return 1; +} + +static void glnvg__renderFill(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float aasize, + const float* bounds, const struct NVGpath* paths, int npaths) +{ + struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr; + const struct NVGpath* path; + int i; + + if (gl->gradShader.prog == 0) + return; + + glEnable(GL_CULL_FACE); + + glEnableClientState(GL_VERTEX_ARRAY); + + // Draw shapes + glDisable(GL_BLEND); + glEnable(GL_STENCIL_TEST); + glStencilMask(0xff); + glStencilFunc(GL_ALWAYS, 0, ~0); + glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); + + glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR_WRAP); + glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR_WRAP); + glDisable(GL_CULL_FACE); + for (i = 0; i < npaths; i++) { + path = &paths[i]; + glVertexPointer(2, GL_FLOAT, sizeof(struct NVGvertex), &path->fill[0].x); + glDrawArrays(GL_TRIANGLE_FAN, 0, path->nfill); + } + +/* glStencilOp(GL_KEEP, GL_KEEP, GL_INCR_WRAP); + glCullFace(GL_BACK); + + for (i = 0; i < npaths; i++) { + path = &paths[i]; + glVertexPointer(2, GL_FLOAT, sizeof(struct NVGvertex), &path->fill[0].x); + glDrawArrays(GL_TRIANGLE_FAN, 0, path->nfill); + } + + glStencilOp(GL_KEEP, GL_KEEP, GL_DECR_WRAP); + glCullFace(GL_FRONT); + + for (i = 0; i < npaths; i++) { + path = &paths[i]; + glVertexPointer(2, GL_FLOAT, sizeof(struct NVGvertex), &path->fill[0].x); + glDrawArrays(GL_TRIANGLE_FAN, 0, path->nfill); + } + glCullFace(GL_BACK);*/ + + glEnable(GL_CULL_FACE); + + // Draw aliased off-pixels + glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); + glEnable(GL_BLEND); + + glStencilFunc(GL_EQUAL, 0x00, 0xff); + glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); + + glEnableClientState(GL_TEXTURE_COORD_ARRAY); + + glnvg__setupPaint(gl, paint, scissor, 1.0001f, aasize); + + // Draw fringes + for (i = 0; i < npaths; i++) { + path = &paths[i]; + glVertexPointer(2, GL_FLOAT, sizeof(struct NVGvertex), &path->stroke[0].x); + glTexCoordPointer(2, GL_FLOAT, sizeof(struct NVGvertex), &path->stroke[0].u); + glDrawArrays(GL_TRIANGLE_STRIP, 0, path->nstroke); + } + + glDisableClientState(GL_VERTEX_ARRAY); + glDisableClientState(GL_TEXTURE_COORD_ARRAY); + + // Draw fill + glStencilFunc(GL_NOTEQUAL, 0x0, 0xff); + glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO); + +// glUseProgram(0); +// glColor4ub(255,0,0,128); + + glBegin(GL_QUADS); + glTexCoord2f(0.5f,1.0f); + glVertex2f(bounds[0], bounds[3]); + glVertex2f(bounds[2], bounds[3]); + glVertex2f(bounds[2], bounds[1]); + glVertex2f(bounds[0], bounds[1]); + glEnd(); + + glUseProgram(0); + + glDisable(GL_TEXTURE_2D); + glDisable(GL_STENCIL_TEST); +} + +static void glnvg__renderStroke(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float aasize, + float width, const struct NVGpath* paths, int npaths) +{ + struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr; + const struct NVGpath* path; + int i; + + if (gl->gradShader.prog == 0) + return; + + glnvg__setupPaint(gl, paint, scissor, width, aasize); + + glEnable(GL_CULL_FACE); + + glEnableClientState(GL_VERTEX_ARRAY); + glEnableClientState(GL_TEXTURE_COORD_ARRAY); + + // Draw Strokes + for (i = 0; i < npaths; i++) { + path = &paths[i]; + glVertexPointer(2, GL_FLOAT, sizeof(struct NVGvertex), &path->stroke[0].x); + glTexCoordPointer(2, GL_FLOAT, sizeof(struct NVGvertex), &path->stroke[0].u); + glDrawArrays(GL_TRIANGLE_STRIP, 0, path->nstroke); + } + + glDisableClientState(GL_VERTEX_ARRAY); + glDisableClientState(GL_TEXTURE_COORD_ARRAY); + + glUseProgram(0); + glDisable(GL_TEXTURE_2D); +} + +static void glnvg__renderTriangles(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, int image, + const struct NVGvertex* verts, int nverts) +{ + struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr; + struct GLNVGtexture* tex = glnvg__findTexture(gl, image); + float color[4]; + + if (tex != NULL) { + glBindTexture(GL_TEXTURE_2D, tex->tex); + glEnable(GL_TEXTURE_2D); + } + + glEnableClientState(GL_VERTEX_ARRAY); + glEnableClientState(GL_TEXTURE_COORD_ARRAY); + + glnvg__toFloatColor(color, paint->innerColor); + glColor4fv(color); + + glVertexPointer(2, GL_FLOAT, sizeof(struct NVGvertex), &verts[0].x); + glTexCoordPointer(2, GL_FLOAT, sizeof(struct NVGvertex), &verts[0].u); + glDrawArrays(GL_TRIANGLES, 0, nverts); + + glDisableClientState(GL_VERTEX_ARRAY); + glDisableClientState(GL_TEXTURE_COORD_ARRAY); + + glDisable(GL_TEXTURE_2D); +} + +static void glnvg__renderDelete(void* uptr) +{ + struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr; + int i; + if (gl == NULL) return; + + glnvg__deleteShader(&gl->gradShader); + glnvg__deleteShader(&gl->imgShader); + + for (i = 0; i < gl->ntextures; i++) { + if (gl->textures[i].tex != 0) + glDeleteTextures(1, &gl->textures[i].tex); + } + free(gl->textures); + + free(gl); +} + + +struct NVGcontext* glnvgCreate() +{ + struct NVGparams params; + struct NVGcontext* ctx = NULL; + struct GLNVGcontext* gl = (struct GLNVGcontext*)malloc(sizeof(struct GLNVGcontext)); + if (gl == NULL) goto error; + memset(gl, 0, sizeof(struct GLNVGcontext)); + + memset(¶ms, 0, sizeof(params)); + params.renderCreate = glnvg__renderCreate; + params.renderCreateTexture = glnvg__renderCreateTexture; + params.renderDeleteTexture = glnvg__renderDeleteTexture; + params.renderUpdateTexture = glnvg__renderUpdateTexture; + params.renderGetTextureSize = glnvg__renderGetTextureSize; + params.renderFill = glnvg__renderFill; + params.renderStroke = glnvg__renderStroke; + params.renderTriangles = glnvg__renderTriangles; + params.renderDelete = glnvg__renderDelete; + params.userPtr = gl; + + ctx = nvgCreateInternal(¶ms); + if (ctx == NULL) goto error; + + return ctx; + +error: + if (gl != NULL) free(gl); + if (ctx != NULL) nvgDeleteInternal(ctx); + return NULL; +} + +void glnvgDelete(struct NVGcontext* ctx) +{ + nvgDeleteInternal(ctx); +} + +#endif diff --git a/src/nanovg.c b/src/nanovg.c new file mode 100644 index 0000000..0bf5f03 --- /dev/null +++ b/src/nanovg.c @@ -0,0 +1,1586 @@ +// +// Copyright (c) 2013 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 +#include +#include "nanovg.h" +#define FONTSTASH_IMPLEMENTATION +#include "fontstash.h" +#define STBI_HEADER_FILE_ONLY +#include "stb_image.c" + + +#define NVG_INIT_PATH_SIZE 256 +#define NVG_MAX_STATES 32 + +#define NVG_AA 1.0f +#define NVG_KAPPA90 0.5522847493f // Lenght proportional to radius of a cubic bezier handle for 90deg arcs. + +#define NVG_COUNTOF(arr) (sizeof(arr) / sizeof(0[arr])) + + +enum NVGcommands { + NVG_MOVETO = 0, + NVG_LINETO = 1, + NVG_BEZIERTO = 2, + NVG_CLOSE = 3, + NVG_WINDING = 4, +}; + +enum NVGpointFlags +{ + NVG_BEVEL = 0x01, + NVG_LEFT = 0x02, + NVG_CUSP = 0x04, +}; + +enum NVGexpandFeatures { + NVG_FILL = 0x01, + NVG_STROKE = 0x02, + NVG_CAPS = 0x04, +}; + +struct NVGstate { + struct NVGpaint fill; + struct NVGpaint stroke; + float strokeWidth; + float miterLimit; + float xform[6]; + struct NVGscissor scissor; + float fontSize; + float letterSpacing; + float fontBlur; + int textAlign; + int fontId; +}; + +struct NVGpoint { + float x,y; + float dx, dy; + float len; + float dmx, dmy; + unsigned char flags; +}; + +struct NVGpathCache { + struct NVGpoint* points; + int npoints; + int cpoints; + struct NVGpath* paths; + int npaths; + int cpaths; + struct NVGvertex* verts; + int nverts; + int cverts; + float bounds[4]; +}; + +struct NVGcontext { + struct NVGparams params; + float* commands; + int ccommands; + int ncommands; + float commandx, commandy; + struct NVGstate states[NVG_MAX_STATES]; + int nstates; + struct NVGpathCache* cache; + float tessTol; + float distTol; + struct FONScontext* fs; + int fontImage; + int drawCallCount; + int fillTriCount; + int strokeTriCount; + int textTriCount; +}; + +static int nvg__mini(int a, int b) { return a < b ? a : b; } +static int nvg__maxi(int a, int b) { return a > b ? a : b; } +static float nvg__minf(float a, float b) { return a < b ? a : b; } +static float nvg__maxf(float a, float b) { return a > b ? a : b; } +static float nvg__absf(float a) { return a >= 0.0f ? a : -a; } +static float nvg__clampf(float a, float mn, float mx) { return a < mn ? mn : (a > mx ? mx : a); } +static float nvg__cross(float dx0, float dy0, float dx1, float dy1) { return dx1*dy0 - dx0*dy1; } + +static float nvg__normalize(float *x, float* y) +{ + float d = sqrtf((*x)*(*x) + (*y)*(*y)); + if (d > 1e-6f) { + d = 1.0f / d; + *x *= d; + *y *= d; + } + return d; +} + + +static void nvg__deletePathCache(struct NVGpathCache* c) +{ + if (c == NULL) return; + if (c->points != NULL) free(c->points); + if (c->paths != NULL) free(c->paths); + if (c->verts != NULL) free(c->verts); + free(c); +} + +static struct NVGpathCache* nvg__allocPathCache() +{ + struct NVGpathCache* c = (struct NVGpathCache*)malloc(sizeof(struct NVGpathCache)); + if (c == NULL) goto error; + memset(c, 0, sizeof(struct NVGpathCache)); + + c->points = (struct NVGpoint*)malloc(sizeof(struct NVGpoint)*4); + if (!c->points) goto error; + c->npoints = 0; + c->cpoints = 4; + + c->paths = (struct NVGpath*)malloc(sizeof(struct NVGpath)*4); + if (!c->paths) goto error; + c->npaths = 0; + c->cpaths = 4; + + c->verts = (struct NVGvertex*)malloc(sizeof(struct NVGvertex)*4); + if (!c->verts) goto error; + c->nverts = 0; + c->cverts = 4; + + return c; +error: + nvg__deletePathCache(c); + return NULL; +} + + +struct NVGcontext* nvgCreateInternal(struct NVGparams* params) +{ + struct FONSparams fontParams; + struct NVGcontext* ctx = (struct NVGcontext*)malloc(sizeof(struct NVGcontext)); + if (ctx == NULL) goto error; + memset(ctx, 0, sizeof(struct NVGcontext)); + + ctx->params = *params; + + ctx->commands = (float*)malloc(sizeof(float)*NVG_INIT_PATH_SIZE); + if (!ctx->commands) goto error; + ctx->ncommands = 0; + ctx->ccommands = NVG_INIT_PATH_SIZE; + + ctx->cache = nvg__allocPathCache(); + if (ctx->cache == NULL) goto error; + + nvgSave(ctx); + nvgReset(ctx); + + ctx->tessTol = 0.3f * 4.0f; + ctx->distTol = 0.01f; + + if (ctx->params.renderCreate(ctx->params.userPtr) == 0) goto error; + + // Init font rendering + memset(&fontParams, 0, sizeof(fontParams)); + fontParams.width = 512; + fontParams.height = 512; + fontParams.flags = FONS_ZERO_TOPLEFT; + fontParams.renderCreate = NULL; + fontParams.renderUpdate = NULL; + fontParams.renderDraw = NULL; + fontParams.renderDelete = NULL; + fontParams.userPtr = NULL; + ctx->fs = fonsCreate(&fontParams); + if (ctx->fs == NULL) goto error; + + // Create font texture + ctx->fontImage = ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_ALPHA, 512, 512, NULL); + if (ctx->fontImage == 0) goto error; + + return ctx; + +error: + nvgDeleteInternal(ctx); + return 0; +} + +void nvgDeleteInternal(struct NVGcontext* ctx) +{ + if (ctx == NULL) return; + if (ctx->commands != NULL) free(ctx->commands); + if (ctx->cache != NULL) nvg__deletePathCache(ctx->cache); + + if (ctx->fs) + fonsDelete(ctx->fs); + + if (ctx->params.renderDelete != NULL) + ctx->params.renderDelete(ctx->params.userPtr); + + free(ctx); +} + +void nvgBeginFrame(struct NVGcontext* ctx) +{ +/* printf("Tris: draws:%d fill:%d stroke:%d text:%d TOT:%d\n", + ctx->drawCallCount, ctx->fillTriCount, ctx->strokeTriCount, ctx->textTriCount, + ctx->fillTriCount+ctx->strokeTriCount+ctx->textTriCount);*/ + + ctx->drawCallCount = 0; + ctx->fillTriCount = 0; + ctx->strokeTriCount = 0; + ctx->textTriCount = 0; +} + +unsigned int nvgRGB(unsigned char r, unsigned char g, unsigned char b) +{ + return nvgRGBA(r,g,b,255); +} + +unsigned int nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a) +{ + return (r) | (g << 8) | (b << 16) | (a << 24); +} + +unsigned int nvgLerpRGBA(unsigned int c0, unsigned int c1, float u) +{ + int iu = (float)(nvg__clampf(u, 0.0f, 1.0f) * 256.0f); + int r = (((c0) & 0xff)*(256-iu) + (((c1) & 0xff)*iu)) >> 8; + int g = (((c0>>8) & 0xff)*(256-iu) + (((c1>>8) & 0xff)*iu)) >> 8; + int b = (((c0>>16) & 0xff)*(256-iu) + (((c1>>16) & 0xff)*iu)) >> 8; + int a = (((c0>>24) & 0xff)*(256-iu) + (((c1>>24) & 0xff)*iu)) >> 8; + return nvgRGBA(r,g,b,a); +} + + +static struct NVGstate* nvg__getState(struct NVGcontext* ctx) +{ + return &ctx->states[ctx->nstates-1]; +} + +static void nvg__xformIdentity(float* t) +{ + t[0] = 1.0f; t[1] = 0.0f; + t[2] = 0.0f; t[3] = 1.0f; + t[4] = 0.0f; t[5] = 0.0f; +} + +static void nvg__xformTranslate(float* t, float tx, float ty) +{ + t[0] = 1.0f; t[1] = 0.0f; + t[2] = 0.0f; t[3] = 1.0f; + t[4] = tx; t[5] = ty; +} + +static void nvg__xformScale(float* t, float sx, float sy) +{ + t[0] = sx; t[1] = 0.0f; + t[2] = 0.0f; t[3] = sy; + t[4] = 0.0f; t[5] = 0.0f; +} + +static void nvg__xformRotate(float* t, float a) +{ + float cs = cosf(a), sn = sinf(a); + t[0] = cs; t[1] = sn; + t[2] = -sn; t[3] = cs; + t[4] = 0.0f; t[5] = 0.0f; +} + +static void nvg__xformMultiply(float* t, float* s) +{ + float t0 = t[0] * s[0] + t[1] * s[2]; + float t2 = t[2] * s[0] + t[3] * s[2]; + float t4 = t[4] * s[0] + t[5] * s[2] + s[4]; + t[1] = t[0] * s[1] + t[1] * s[3]; + t[3] = t[2] * s[1] + t[3] * s[3]; + t[5] = t[4] * s[1] + t[5] * s[3] + s[5]; + t[0] = t0; + t[2] = t2; + t[4] = t4; +} + +static void nvg__xformPremultiply(float* t, float* s) +{ + float s2[6]; + memcpy(s2, s, sizeof(float)*6); + nvg__xformMultiply(s2, t); + memcpy(t, s2, sizeof(float)*6); +} + +static void nvg__setPaintColor(struct NVGpaint* p, unsigned int color) +{ + memset(p, 0, sizeof(*p)); + nvg__xformIdentity(p->xform); + p->radius = 0.0f; + p->feather = 1.0f; + p->innerColor = color; + p->outerColor = color; +} + + +// State handling +void nvgSave(struct NVGcontext* ctx) +{ + if (ctx->nstates >= NVG_MAX_STATES) + return; + if (ctx->nstates > 0) + memcpy(&ctx->states[ctx->nstates], &ctx->states[ctx->nstates-1], sizeof(struct NVGstate)); + ctx->nstates++; +} + +void nvgRestore(struct NVGcontext* ctx) +{ + if (ctx->nstates <= 1) + return; + ctx->nstates--; +} + +void nvgReset(struct NVGcontext* ctx) +{ + struct NVGstate* state = nvg__getState(ctx); + memset(state, 0, sizeof(*state)); + + nvg__setPaintColor(&state->fill, nvgRGBA(255,255,255,255)); + nvg__setPaintColor(&state->stroke, nvgRGBA(0,0,0,255)); + state->strokeWidth = 1.0f; + state->miterLimit = 1.2f; + nvg__xformIdentity(state->xform); + + state->scissor.extent[0] = 0.0f; + state->scissor.extent[1] = 0.0f; + + state->fontSize = 16.0f; + state->letterSpacing = 0.0f; + state->fontBlur = 0.0f; + state->textAlign = NVG_ALIGN_LEFT | NVG_ALIGN_BASELINE; + state->fontId = 0; +} + +// State setting +void nvgStrokeWidth(struct NVGcontext* ctx, float width) +{ + struct NVGstate* state = nvg__getState(ctx); + state->strokeWidth = width; +} + +void nvgMiterLimit(struct NVGcontext* ctx, float limit) +{ + struct NVGstate* state = nvg__getState(ctx); + state->miterLimit = limit; +} + +void nvgTransform(struct NVGcontext* ctx, float a, float b, float c, float d, float e, float f) +{ + struct NVGstate* state = nvg__getState(ctx); + float t[6] = { a, b, c, d, e, f }; + nvg__xformPremultiply(state->xform, t); +} + +void nvgResetTransform(struct NVGcontext* ctx) +{ + struct NVGstate* state = nvg__getState(ctx); + nvg__xformIdentity(state->xform); +} + +void nvgTranslate(struct NVGcontext* ctx, float x, float y) +{ + struct NVGstate* state = nvg__getState(ctx); + float t[6]; + nvg__xformTranslate(t, x,y); + nvg__xformPremultiply(state->xform, t); +} + +void nvgRotate(struct NVGcontext* ctx, float angle) +{ + struct NVGstate* state = nvg__getState(ctx); + float t[6]; + nvg__xformRotate(t, angle); + nvg__xformPremultiply(state->xform, t); +} + +void nvgScale(struct NVGcontext* ctx, float x, float y) +{ + struct NVGstate* state = nvg__getState(ctx); + float t[6]; + nvg__xformScale(t, x,y); + nvg__xformPremultiply(state->xform, t); +} + + +void nvgStrokeColor(struct NVGcontext* ctx, unsigned int color) +{ + struct NVGstate* state = nvg__getState(ctx); + nvg__setPaintColor(&state->stroke, color); +} + +void nvgStrokePaint(struct NVGcontext* ctx, struct NVGpaint paint) +{ + struct NVGstate* state = nvg__getState(ctx); + state->stroke = paint; + nvg__xformMultiply(state->stroke.xform, state->xform); +} + +void nvgFillColor(struct NVGcontext* ctx, unsigned int color) +{ + struct NVGstate* state = nvg__getState(ctx); + nvg__setPaintColor(&state->fill, color); +} + +void nvgFillPaint(struct NVGcontext* ctx, struct NVGpaint paint) +{ + struct NVGstate* state = nvg__getState(ctx); + state->fill = paint; + nvg__xformMultiply(state->fill.xform, state->xform); +} + +int nvgCreateImage(struct NVGcontext* ctx, const char* filename) +{ + int w, h, n, image; + unsigned char* img = stbi_load(filename, &w, &h, &n, 4); + if (img == NULL) { +// printf("Failed to load %s - %s\n", filename, stbi_failure_reason()); + return 0; + } + image = nvgCreateImageRGBA(ctx, w, h, img); + stbi_image_free(img); + return image; +} + +int nvgCreateImageMem(struct NVGcontext* ctx, unsigned char* data, int ndata, int freeData) +{ + int w, h, n, image; + unsigned char* img = stbi_load_from_memory(data, ndata, &w, &h, &n, 4); + if (img == NULL) { +// printf("Failed to load %s - %s\n", filename, stbi_failure_reason()); + return 0; + } + image = nvgCreateImageRGBA(ctx, w, h, img); + stbi_image_free(img); + return image; +} + +int nvgCreateImageRGBA(struct NVGcontext* ctx, int w, int h, const unsigned char* data) +{ + return ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_RGBA, w, h, data); +} + +void nvgUpdateImage(struct NVGcontext* ctx, int image, const unsigned char* data) +{ + int w, h; + ctx->params.renderGetTextureSize(ctx->params.userPtr, image, &w, &h); + ctx->params.renderUpdateTexture(ctx->params.userPtr, image, 0,0, w,h, data); +} + +void nvgImageSize(struct NVGcontext* ctx, int image, int* w, int* h) +{ + ctx->params.renderGetTextureSize(ctx->params.userPtr, image, w, h); +} + +void nvgDeleteImage(struct NVGcontext* ctx, int image) +{ + ctx->params.renderDeleteTexture(ctx->params.userPtr, image); +} + +struct NVGpaint nvgLinearGradient(struct NVGcontext* ctx, + float sx, float sy, float ex, float ey, + unsigned int icol, unsigned int ocol) +{ + struct NVGpaint p; + float dx, dy, d; + const float large = 1e5; + + memset(&p, 0, sizeof(p)); + + // Calculate transform aligned to the line + dx = ex - sx; + dy = ey - sy; + d = sqrtf(dx*dx + dy*dy); + if (d > 0.0001f) { + dx /= d; + dy /= d; + } else { + dx = 0; + dy = 1; + } + + p.xform[0] = dy; p.xform[1] = -dx; + p.xform[2] = dx; p.xform[3] = dy; + p.xform[4] = sx - dx*large; p.xform[5] = sy - dy*large; + + p.extent[0] = large; + p.extent[1] = large + d*0.5f; + + p.radius = 0.0f; + + p.feather = nvg__maxf(1.0f, d); + + p.innerColor = icol; + p.outerColor = ocol; + + return p; +} + +struct NVGpaint nvgRadialGradient(struct NVGcontext* ctx, + float cx, float cy, float inr, float outr, + unsigned int icol, unsigned int ocol) +{ + struct NVGpaint p; + float r = (inr+outr)*0.5f; + float f = (outr-inr); + + memset(&p, 0, sizeof(p)); + + nvg__xformIdentity(p.xform); + p.xform[4] = cx; + p.xform[5] = cy; + + p.extent[0] = r; + p.extent[1] = r; + + p.radius = r; + + p.feather = nvg__maxf(1.0f, f); + + p.innerColor = icol; + p.outerColor = ocol; + + return p; +} + +struct NVGpaint nvgBoxGradient(struct NVGcontext* ctx, + float x, float y, float w, float h, float r, float f, + unsigned int icol, unsigned int ocol) +{ + struct NVGpaint p; + + memset(&p, 0, sizeof(p)); + + nvg__xformIdentity(p.xform); + p.xform[4] = x+w*0.5f; + p.xform[5] = y+h*0.5f; + + p.extent[0] = w*0.5f; + p.extent[1] = h*0.5f; + + p.radius = r; + + p.feather = nvg__maxf(1.0f, f); + + p.innerColor = icol; + p.outerColor = ocol; + + return p; +} + + +struct NVGpaint nvgImagePattern(struct NVGcontext* ctx, + float cx, float cy, float w, float h, float angle, + int image, int repeat) +{ + struct NVGpaint p; + + memset(&p, 0, sizeof(p)); + + nvg__xformRotate(p.xform, angle); + p.xform[4] = cx; + p.xform[5] = cy; + + p.extent[0] = w; + p.extent[1] = h; + + p.image = image; + p.repeat = repeat; + + return p; +} + +// Scissoring +void nvgScissor(struct NVGcontext* ctx, float x, float y, float w, float h) +{ + struct NVGstate* state = nvg__getState(ctx); + + nvg__xformIdentity(state->scissor.xform); + state->scissor.xform[4] = x+w*0.5f; + state->scissor.xform[5] = y+h*0.5f; + nvg__xformMultiply(state->scissor.xform, state->xform); + + state->scissor.extent[0] = w*0.5f; + state->scissor.extent[1] = h*0.5f; +} + +void nvgResetScissor(struct NVGcontext* ctx) +{ + struct NVGstate* state = nvg__getState(ctx); + memset(state->scissor.xform, 0, sizeof(state->scissor.xform)); + state->scissor.extent[0] = 0; + state->scissor.extent[1] = 0; +} + +static void nvg__xformPt(float* dx, float* dy, float sx, float sy, const float* t) +{ + *dx = sx*t[0] + sy*t[2] + t[4]; + *dy = sx*t[1] + sy*t[3] + t[5]; +} + +static int nvg__ptEquals(float x1, float y1, float x2, float y2, float tol) +{ + float dx = x2 - x1; + float dy = y2 - y1; + return dx*dx + dy*dy < tol*tol; +} + +static float nvg__distPtSeg(float x, float y, float px, float py, float qx, float qy) +{ + float pqx, pqy, dx, dy, d, t; + pqx = qx-px; + pqy = qy-py; + dx = x-px; + dy = y-py; + d = pqx*pqx + pqy*pqy; + t = pqx*dx + pqy*dy; + if (d > 0) t /= d; + if (t < 0) t = 0; + else if (t > 1) t = 1; + dx = px + t*pqx - x; + dy = py + t*pqy - y; + return dx*dx + dy*dy; +} + +static void nvg__appendCommands(struct NVGcontext* ctx, float* vals, int nvals) +{ + struct NVGstate* state = nvg__getState(ctx); + int i; + + if (ctx->ncommands+nvals > ctx->ccommands) { + if (ctx->ccommands == 0) ctx->ccommands = 8; + while (ctx->ccommands < ctx->ncommands+nvals) + ctx->ccommands *= 2; + ctx->commands = (float*)realloc(ctx->commands, ctx->ccommands*sizeof(float)); + if (ctx->commands == NULL) return; + } + + // transform commands + i = 0; + while (i < nvals) { + int cmd = (int)vals[i]; + switch (cmd) { + case NVG_MOVETO: + nvg__xformPt(&vals[i+1],&vals[i+2], vals[i+1],vals[i+2], state->xform); + i += 3; + break; + case NVG_LINETO: + nvg__xformPt(&vals[i+1],&vals[i+2], vals[i+1],vals[i+2], state->xform); + i += 3; + break; + case NVG_BEZIERTO: + nvg__xformPt(&vals[i+1],&vals[i+2], vals[i+1],vals[i+2], state->xform); + nvg__xformPt(&vals[i+3],&vals[i+4], vals[i+3],vals[i+4], state->xform); + nvg__xformPt(&vals[i+5],&vals[i+6], vals[i+5],vals[i+6], state->xform); + i += 7; + break; + case NVG_CLOSE: + i++; + break; + case NVG_WINDING: + i += 2; + break; + default: + i++; + } + } + + memcpy(&ctx->commands[ctx->ncommands], vals, nvals*sizeof(float)); + + ctx->ncommands += nvals; + + if ((int)vals[0] != NVG_CLOSE && (int)vals[0] != NVG_WINDING) { + ctx->commandx = vals[nvals-2]; + ctx->commandy = vals[nvals-1]; + } +} + + +static void nvg__clearPathCache(struct NVGcontext* ctx) +{ + ctx->cache->npoints = 0; + ctx->cache->npaths = 0; +} + +static struct NVGpath* nvg__lastPath(struct NVGcontext* ctx) +{ + if (ctx->cache->npaths > 0) + return &ctx->cache->paths[ctx->cache->npaths-1]; + return NULL; +} + +static void nvg__addPath(struct NVGcontext* ctx) +{ + struct NVGpath* path; + if (ctx->cache->npaths+1 > ctx->cache->cpaths) { + ctx->cache->cpaths = (ctx->cache->cpaths == 0) ? 8 : (ctx->cache->cpaths*2); + ctx->cache->paths = (struct NVGpath*)realloc(ctx->cache->paths, sizeof(struct NVGpath)*ctx->cache->cpaths); + if (ctx->cache->paths == NULL) return; + } + path = &ctx->cache->paths[ctx->cache->npaths]; + memset(path, 0, sizeof(*path)); + path->first = ctx->cache->npoints; + path->winding = NVG_CCW; + + ctx->cache->npaths++; +} + +static struct NVGpoint* nvg__lastPoint(struct NVGcontext* ctx) +{ + if (ctx->cache->npoints > 0) + return &ctx->cache->points[ctx->cache->npoints-1]; + return NULL; +} + +static void nvg__addPoint(struct NVGcontext* ctx, float x, float y) +{ + struct NVGpath* path = nvg__lastPath(ctx); + struct NVGpoint* pt; + if (path == NULL) return; + + if (ctx->cache->npoints > 0) { + pt = nvg__lastPoint(ctx); + if (nvg__ptEquals(pt->x,pt->y, x,y, ctx->distTol)) + return; + } + + if (ctx->cache->npoints+1 > ctx->cache->cpoints) { + ctx->cache->cpoints = (ctx->cache->cpoints == 0) ? 8 : (ctx->cache->cpoints*2); + ctx->cache->points = (struct NVGpoint*)realloc(ctx->cache->points, sizeof(struct NVGpoint)*ctx->cache->cpoints); + if (ctx->cache->points == NULL) return; + } + + pt = &ctx->cache->points[ctx->cache->npoints]; + memset(pt, 0, sizeof(*pt)); + pt->x = x; + pt->y = y; + + ctx->cache->npoints++; + path->count++; +} + +static void nvg__closePath(struct NVGcontext* ctx) +{ + struct NVGpath* path = nvg__lastPath(ctx); + if (path == NULL) return; + path->closed = 1; +} + +static void nvg__pathWinding(struct NVGcontext* ctx, int winding) +{ + struct NVGpath* path = nvg__lastPath(ctx); + if (path == NULL) return; + path->winding = winding; +} + +static float nvg__getAverageScale(float *t) +{ + float sx = sqrtf(t[0]*t[0] + t[2]*t[2]); + float sy = sqrtf(t[1]*t[1] + t[3]*t[3]); + return (sx + sy) * 0.5f; +} + +static struct NVGvertex* nvg__allocTempVerts(struct NVGcontext* ctx, int nverts) +{ + if (nverts > ctx->cache->cverts) { + if (ctx->cache->cverts == 0) ctx->cache->cverts = 8; + while (ctx->cache->cverts < nverts) + ctx->cache->cverts *= 2; + ctx->cache->verts = (struct NVGvertex*)realloc(ctx->cache->verts, sizeof(struct NVGvertex)*ctx->cache->cverts); + if (ctx->cache->verts == NULL) return NULL; + } + return ctx->cache->verts; +} + +static float nvg__triarea2(float ax, float ay, float bx, float by, float cx, float cy) +{ + float abx = bx - ax; + float aby = by - ay; + float acx = cx - ax; + float acy = cy - ay; + return acx*aby - abx*acy; +} + +static float nvg__polyArea(struct NVGpoint* pts, int npts) +{ + int i; + float area = 0; + for (i = 2; i < npts; i++) { + struct NVGpoint* a = &pts[0]; + struct NVGpoint* b = &pts[i-1]; + struct NVGpoint* c = &pts[i]; + area += nvg__triarea2(a->x,a->y, b->x,b->y, c->x,c->y); + } + return area * 0.5f; +} + +static void nvg__polyReverse(struct NVGpoint* pts, int npts) +{ + struct NVGpoint tmp; + int i = 0, j = npts-1; + while (i < j) { + tmp = pts[i]; + pts[i] = pts[j]; + pts[j] = tmp; + i++; + j--; + } +} + + +static void nvg__vset(struct NVGvertex* vtx, float x, float y, float u, float v) +{ + vtx->x = x; + vtx->y = y; + vtx->u = u; + vtx->v = v; +} + +static void nvg__tesselateBezier(struct NVGcontext* ctx, + float x1, float y1, float x2, float y2, + float x3, float y3, float x4, float y4, + int level) +{ + float x12,y12,x23,y23,x34,y34,x123,y123,x234,y234,x1234,y1234; + + if (level > 10) return; + + if (nvg__absf(x1+x3-x2-x2) + nvg__absf(y1+y3-y2-y2) + nvg__absf(x2+x4-x3-x3) + nvg__absf(y2+y4-y3-y3) < ctx->tessTol) { + nvg__addPoint(ctx, x4, y4); + return; + } + + x12 = (x1+x2)*0.5f; + y12 = (y1+y2)*0.5f; + x23 = (x2+x3)*0.5f; + y23 = (y2+y3)*0.5f; + x34 = (x3+x4)*0.5f; + y34 = (y3+y4)*0.5f; + x123 = (x12+x23)*0.5f; + y123 = (y12+y23)*0.5f; + x234 = (x23+x34)*0.5f; + y234 = (y23+y34)*0.5f; + x1234 = (x123+x234)*0.5f; + y1234 = (y123+y234)*0.5f; + + nvg__tesselateBezier(ctx, x1,y1, x12,y12, x123,y123, x1234,y1234, level+1); + nvg__tesselateBezier(ctx, x1234,y1234, x234,y234, x34,y34, x4,y4, level+1); +} + +static void nvg__flattenPaths(struct NVGcontext* ctx, float m) +{ + struct NVGpathCache* cache = ctx->cache; +// struct NVGstate* state = nvg__getState(ctx); + struct NVGpoint* last; + struct NVGpoint* p0; + struct NVGpoint* p1; + struct NVGpoint* pts; + struct NVGpath* path; + int i, j; + float* cp1; + float* cp2; + float* p; + float area; + + if (cache->npaths > 0) + return; + + // Flatten + i = 0; + while (i < ctx->ncommands) { + int cmd = (int)ctx->commands[i]; + switch (cmd) { + case NVG_MOVETO: + nvg__addPath(ctx); + p = &ctx->commands[i+1]; + nvg__addPoint(ctx, p[0], p[1]); + i += 3; + break; + case NVG_LINETO: + p = &ctx->commands[i+1]; + nvg__addPoint(ctx, p[0], p[1]); + i += 3; + break; + case NVG_BEZIERTO: + last = nvg__lastPoint(ctx); + if (last != NULL) { + cp1 = &ctx->commands[i+1]; + cp2 = &ctx->commands[i+3]; + p = &ctx->commands[i+5]; + nvg__tesselateBezier(ctx, last->x,last->y, cp1[0],cp1[1], cp2[0],cp2[1], p[0],p[1], 0); + } + i += 7; + break; + case NVG_CLOSE: + nvg__closePath(ctx); + i++; + break; + case NVG_WINDING: + nvg__pathWinding(ctx, (int)ctx->commands[i+1]); + i += 2; + break; + default: + i++; + } + } + + cache->bounds[0] = cache->bounds[1] = 1e6f; + cache->bounds[2] = cache->bounds[3] = -1e6f; + + // Calculate the direction and length of line segments. + for (j = 0; j < cache->npaths; j++) { + path = &cache->paths[j]; + pts = &cache->points[path->first]; + + // If the first and last points are the same, remove the last, mark as closed path. + p0 = &pts[path->count-1]; + p1 = &pts[0]; + if (nvg__ptEquals(p0->x,p0->y, p1->x,p1->y, ctx->distTol)) { + path->count--; + p0 = &pts[path->count-1]; + path->closed = 1; + } + + // Enforce winding. + if (path->count > 2) { + area = nvg__polyArea(pts, path->count); + if (path->winding == NVG_CCW && area > 0.0f) + nvg__polyReverse(pts, path->count); + if (path->winding == NVG_CW && area < 0.0f) + nvg__polyReverse(pts, path->count); + } + + for(i = 0; i < path->count; ++i) { + // Calculate segment direction and length + p0->dx = p1->x - p0->x; + p0->dy = p1->y - p0->y; + p0->len = nvg__normalize(&p0->dx, &p0->dy); + // Update bounds + cache->bounds[0] = nvg__minf(cache->bounds[0], p0->x); + cache->bounds[1] = nvg__minf(cache->bounds[1], p0->y); + cache->bounds[2] = nvg__maxf(cache->bounds[2], p0->x); + cache->bounds[3] = nvg__maxf(cache->bounds[3], p0->y); + // Advance + p0 = p1++; + } + } + + // Calculate which joins needs extra vertices to append, and gather vertex count. + for (j = 0; j < cache->npaths; j++) { + path = &cache->paths[j]; + pts = &cache->points[path->first]; + path->nbevel = 0; + + p0 = &pts[path->count-1]; + p1 = &pts[0]; + for(i = 0; i < path->count; ++i) { + float dlx0, dly0, dlx1, dly1, dmr2, scale, cross; + dlx0 = p0->dy; + dly0 = -p0->dx; + dlx1 = p1->dy; + dly1 = -p1->dx; + // Calculate extrusions + p1->dmx = (dlx0 + dlx1) * 0.5f; + p1->dmy = (dly0 + dly1) * 0.5f; + dmr2 = p1->dmx*p1->dmx + p1->dmy*p1->dmy; + if (dmr2 > 0.000001f) { + scale = 1.0f / dmr2; + if (scale > 200.0f) scale = 200.0f; + p1->dmx *= scale; + p1->dmy *= scale; + } + // Check to see if the corner needs to be beveled. + if ((dmr2 * m*m) < 1.0f) { + cross = p1->dx * p0->dy - p0->dx * p1->dy; + p1->flags |= NVG_BEVEL; + if (cross < 0) + p1->flags |= NVG_LEFT; + path->nbevel++; + } + p0 = p1++; + } + } +} + +static int nvg__expandStrokeAndFill(struct NVGcontext* ctx, int feats, float w) +{ + struct NVGpathCache* cache = ctx->cache; + struct NVGpath* path; + struct NVGpoint* pts; + struct NVGvertex* verts; + struct NVGvertex* dst; + struct NVGpoint* p0; + struct NVGpoint* p1; + int nstroke, cverts; + int i, j, s, e; + float wo = 0; + + // Calculate max vertex usage. + cverts = 0; + for (i = 0; i < cache->npaths; i++) { + path = &cache->paths[i]; + if (feats & NVG_FILL) + cverts += path->count + path->nbevel + 1; + if (feats & NVG_STROKE) { + int loop = ((feats & NVG_CAPS) && path->closed == 0) ? 0 : 1; + cverts += (path->count + path->nbevel + 1) * 2; // plus one for loop + if (loop == 0) + cverts += (3+3)*2; // space for caps + } + } + + verts = nvg__allocTempVerts(ctx, cverts); + if (verts == NULL) return 0; + + for (i = 0; i < cache->npaths; i++) { + path = &cache->paths[i]; + pts = &cache->points[path->first]; + nstroke = (path->count + path->nbevel + 1) * 2; + + // Calculate shape vertices. + if (feats & NVG_FILL) { + wo = 0.5f; + dst = verts; + path->fill = dst; + + // Looping + p0 = &pts[path->count-1]; + p1 = &pts[0]; + for (j = 0; j < path->count; ++j) { + if (p1->flags & NVG_BEVEL) { + float dlx0 = p0->dy; + float dly0 = -p0->dx; + float dlx1 = p1->dy; + float dly1 = -p1->dx; + if (p1->flags & NVG_LEFT) { + float lx = p1->x - p1->dmx * wo; + float ly = p1->y - p1->dmy * wo; + nvg__vset(dst, lx, ly, 0.5f,1); dst++; + } else { + float lx0 = p1->x - dlx0 * wo; + float ly0 = p1->y - dly0 * wo; + float lx1 = p1->x - dlx1 * wo; + float ly1 = p1->y - dly1 * wo; + nvg__vset(dst, lx0, ly0, 0.5f,1); dst++; + nvg__vset(dst, lx1, ly1, 0.5f,1); dst++; + } + } else { + nvg__vset(dst, p1->x - (p1->dmx * wo), p1->y - (p1->dmy * wo), 0.5f,1); dst++; + } + p0 = p1++; + } + + path->nfill = (int)(dst - verts); + verts += path->nfill; + + } else { + wo = 0.0f; + path->fill = 0; + path->nfill = 0; + } + + // Calculate fringe + if (feats & NVG_STROKE) { + float lw = w + wo; float rw = w - wo; + int loop = ((feats & NVG_CAPS) && path->closed == 0) ? 0 : 1; + dst = verts; + path->stroke = dst; + + if (loop) { + // Looping + p0 = &pts[path->count-1]; + p1 = &pts[0]; + s = 0; + e = path->count; + } else { + // Add cap + p0 = &pts[0]; + p1 = &pts[1]; + s = 1; + e = path->count-1; + } + + if (loop == 0) { + // Add cap + float dx, dy, dlx, dly; + dx = p1->x - p0->x; + dy = p1->y - p0->y; + nvg__normalize(&dx, &dy); + dlx = dy; + dly = -dx; + nvg__vset(dst, p0->x + dlx*rw - dx*NVG_AA, p0->y + dly*rw - dy*NVG_AA, 0,0); dst++; + nvg__vset(dst, p0->x - dlx*lw - dx*NVG_AA, p0->y - dly*lw - dy*NVG_AA, 1,0); dst++; + nvg__vset(dst, p0->x + dlx*rw, p0->y + dly * rw, 0,1); dst++; + nvg__vset(dst, p0->x - dlx*lw, p0->y - dly * lw, 1,1); dst++; + } + + for (j = s; j < e; ++j) { + if (p1->flags & NVG_BEVEL) { + float dlx0 = p0->dy; + float dly0 = -p0->dx; + float dlx1 = p1->dy; + float dly1 = -p1->dx; + if (p1->flags & NVG_LEFT) { + float rx0 = p1->x + dlx0 * rw; + float ry0 = p1->y + dly0 * rw; + float rx1 = p1->x + dlx1 * rw; + float ry1 = p1->y + dly1 * rw; + float lx = p1->x - p1->dmx * lw; + float ly = p1->y - p1->dmy * lw; + nvg__vset(dst, rx0, ry0, 0,1); dst++; + nvg__vset(dst, lx, ly, 1,1); dst++; + nvg__vset(dst, rx1, ry1, 0,1); dst++; + nvg__vset(dst, lx, ly, 1,1); dst++; + } else { + float rx = p1->x + p1->dmx * rw; + float ry = p1->y + p1->dmy * rw; + float lx0 = p1->x - dlx0 * lw; + float ly0 = p1->y - dly0 * lw; + float lx1 = p1->x - dlx1 * lw; + float ly1 = p1->y - dly1 * lw; + nvg__vset(dst, rx, ry, 0,1); dst++; + nvg__vset(dst, lx0, ly0, 1,1); dst++; + nvg__vset(dst, rx, ry, 0,1); dst++; + nvg__vset(dst, lx1, ly1, 1,1); dst++; + } + } else { + nvg__vset(dst, p1->x + (p1->dmx * rw), p1->y + (p1->dmy * rw), 0,1); dst++; + nvg__vset(dst, p1->x - (p1->dmx * lw), p1->y - (p1->dmy * lw), 1,1); dst++; + } + p0 = p1++; + } + + if (loop) { + // Loop it + nvg__vset(dst, verts[0].x, verts[0].y, 0,1); dst++; + nvg__vset(dst, verts[1].x, verts[1].y, 1,1); dst++; + } else { + // Add cap + float dx, dy, dlx, dly; + dx = p1->x - p0->x; + dy = p1->y - p0->y; + nvg__normalize(&dx, &dy); + dlx = dy; + dly = -dx; + nvg__vset(dst, p1->x + dlx*rw, p1->y + dly * rw, 0,1); dst++; + nvg__vset(dst, p1->x - dlx*lw, p1->y - dly * lw, 1,1); dst++; + nvg__vset(dst, p1->x + dlx*rw + dx*NVG_AA, p1->y + dly*rw + dy*NVG_AA, 0,0); dst++; + nvg__vset(dst, p1->x - dlx*lw + dx*NVG_AA, p1->y - dly*lw + dy*NVG_AA, 1,0); dst++; + } + + path->nstroke = (int)(dst - verts); + + verts += nstroke; + } else { + path->stroke = 0; + path->nstroke = 0; + } + } + + return 1; +} + + +// Draw +void nvgBeginPath(struct NVGcontext* ctx) +{ + ctx->ncommands = 0; + nvg__clearPathCache(ctx); +} + +void nvgMoveTo(struct NVGcontext* ctx, float x, float y) +{ + float vals[] = { NVG_MOVETO, x, y }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgLineTo(struct NVGcontext* ctx, float x, float y) +{ + float vals[] = { NVG_LINETO, x, y }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgBezierTo(struct NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y) +{ + float vals[] = { NVG_BEZIERTO, c1x, c1y, c2x, c2y, x, y }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgArcTo(struct NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius) +{ + float x0 = ctx->commandx; + float y0 = ctx->commandx; + float dx0,dy0, dx1,dy1, a, d, cx,cy, a0,a1; + int dir; + + if (ctx->ncommands == 0) { + return; + } + + // Handle degenerate cases. + if (nvg__ptEquals(x0,y0, x1,y1, ctx->distTol) || + nvg__ptEquals(x1,y1, x2,y2, ctx->distTol) || + nvg__distPtSeg(x1,y1, x0,y0, x2,y2) < ctx->distTol*ctx->distTol || + radius < ctx->distTol) { + nvgLineTo(ctx, x1,y1); + return; + } + + // Calculate tangential circle to lines (x0,y0)-(x1,y1) and (x1,y1)-(x2,y2). + dx0 = x0-x1; + dy0 = y0-y1; + dx1 = x2-x1; + dy1 = y2-y1; + nvg__normalize(&dx0,&dy0); + nvg__normalize(&dx1,&dy1); + a = acosf(dx0*dx1 + dy0*dy1); + d = radius / tanf(a/2.0f); + + if (d > 10000.0f) { + nvgLineTo(ctx, x1,y1); + return; + } + + if (nvg__cross(dx0,dy0, dx1,dy1) > 0.0f) { + cx = x1 + dx0*d + dy0*radius; + cy = y1 + dy0*d + -dx0*radius; + a0 = atan2f(dx0, -dy0); + a1 = atan2f(-dx1, dy1); + dir = NVG_CW; + } else { + cx = x1 + dx0*d + -dy0*radius; + cy = y1 + dy0*d + dx0*radius; + a0 = atan2f(-dx0, dy0); + a1 = atan2f(dx1, -dy1); + dir = NVG_CCW; + } + + nvgArc(ctx, cx, cy, radius, a0, a1, dir); +} + +void nvgClosePath(struct NVGcontext* ctx) +{ + float vals[] = { NVG_CLOSE }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgPathWinding(struct NVGcontext* ctx, int dir) +{ + float vals[] = { NVG_WINDING, (float)dir }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgArc(struct NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir) +{ + float a, da, hda, kappa; + float dx, dy, x, y, tanx, tany; + float px, py, ptanx, ptany; + float vals[3 + 5*7 + 100]; + int i, ndivs, nvals; + int move = ctx->ncommands > 0 ? NVG_LINETO : NVG_MOVETO; + + // Clamp angles + da = a1 - a0; + if (dir == NVG_CW) { + if (nvg__absf(da) >= NVG_PI*2) { + da = NVG_PI*2; + } else { + while (da < 0.0f) da += NVG_PI*2; + } + } else { + if (nvg__absf(da) >= NVG_PI*2) { + da = -NVG_PI*2; + } else { + while (da > 0.0f) da -= NVG_PI*2; + } + } + + // Split arc into max 90 degree segments. + ndivs = nvg__mini((int)(nvg__absf(da) / (NVG_PI*0.5f) + 0.5f), 5); + hda = (da / (float)ndivs) / 2.0f; + kappa = nvg__absf(4.0f / 3.0f * (1.0f - cosf(hda)) / sinf(hda)); + + if (dir == NVG_CCW) + kappa = -kappa; + + nvals = 0; + for (i = 0; i <= ndivs; i++) { + a = a0 + da * (i/(float)ndivs); + dx = cosf(a); + dy = sinf(a); + x = cx + dx*r; + y = cy + dy*r; + tanx = -dy*r*kappa; + tany = dx*r*kappa; + + if (i == 0) { + vals[nvals++] = move; + vals[nvals++] = x; + vals[nvals++] = y; + } else { + vals[nvals++] = NVG_BEZIERTO; + vals[nvals++] = px+ptanx; + vals[nvals++] = py+ptany; + vals[nvals++] = x-tanx; + vals[nvals++] = y-tany; + vals[nvals++] = x; + vals[nvals++] = y; + } + px = x; + py = y; + ptanx = tanx; + ptany = tany; + } + + nvg__appendCommands(ctx, vals, nvals); +} + +void nvgRect(struct NVGcontext* ctx, float x, float y, float w, float h) +{ + float vals[] = { + NVG_MOVETO, x,y, + NVG_LINETO, x+w,y, + NVG_LINETO, x+w,y+h, + NVG_LINETO, x,y+h, + NVG_CLOSE + }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgRoundedRect(struct NVGcontext* ctx, float x, float y, float w, float h, float r) +{ + if (r < 0.1f) { + nvgRect(ctx, x,y,w,h); + return; + } + + float vals[] = { + NVG_MOVETO, x+r, y, + NVG_LINETO, x+w-r, y, + NVG_BEZIERTO, x+w-r*(1-NVG_KAPPA90), y, x+w, y+r*(1-NVG_KAPPA90), x+w, y+r, + NVG_LINETO, x+w, y+h-r, + NVG_BEZIERTO, x+w, y+h-r*(1-NVG_KAPPA90), x+w-r*(1-NVG_KAPPA90), y+h, x+w-r, y+h, + NVG_LINETO, x+r, y+h, + NVG_BEZIERTO, x+r*(1-NVG_KAPPA90), y+h, x, y+h-r*(1-NVG_KAPPA90), x, y+h-r, + NVG_LINETO, x, y+r, + NVG_BEZIERTO, x, y+r*(1-NVG_KAPPA90), x+r*(1-NVG_KAPPA90), y, x+r, y, + NVG_CLOSE + }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgEllipse(struct NVGcontext* ctx, float cx, float cy, float rx, float ry) +{ + float vals[] = { + NVG_MOVETO, cx+rx, cy, + NVG_BEZIERTO, cx+rx, cy+ry*NVG_KAPPA90, cx+rx*NVG_KAPPA90, cy+ry, cx, cy+ry, + NVG_BEZIERTO, cx-rx*NVG_KAPPA90, cy+ry, cx-rx, cy+ry*NVG_KAPPA90, cx-rx, cy, + NVG_BEZIERTO, cx-rx, cy-ry*NVG_KAPPA90, cx-rx*NVG_KAPPA90, cy-ry, cx, cy-ry, + NVG_BEZIERTO, cx+rx*NVG_KAPPA90, cy-ry, cx+rx, cy-ry*NVG_KAPPA90, cx+rx, cy, + NVG_CLOSE + }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgCircle(struct NVGcontext* ctx, float cx, float cy, float r) +{ + nvgEllipse(ctx, cx,cy, r,r); +} + + +void nvgFill(struct NVGcontext* ctx) +{ + struct NVGstate* state = nvg__getState(ctx); + const struct NVGpath* path; + int i; + + nvg__flattenPaths(ctx, state->miterLimit); + nvg__expandStrokeAndFill(ctx, NVG_FILL|NVG_STROKE, NVG_AA); + + ctx->params.renderFill(ctx->params.userPtr, &state->fill, &state->scissor, NVG_AA, + ctx->cache->bounds, ctx->cache->paths, ctx->cache->npaths); + + // Count triangles + for (i = 0; i < ctx->cache->npaths; i++) { + path = &ctx->cache->paths[i]; + ctx->fillTriCount += path->nfill-2; + ctx->fillTriCount += path->nstroke-2; + ctx->drawCallCount += 2; + } +} + +void nvgStroke(struct NVGcontext* ctx) +{ + struct NVGstate* state = nvg__getState(ctx); + float scale = nvg__getAverageScale(state->xform); + float strokeWidth = nvg__clampf(state->strokeWidth * scale, 1.0f, 20.0f); + const struct NVGpath* path; + int i; + + nvg__flattenPaths(ctx, state->miterLimit); + nvg__expandStrokeAndFill(ctx, NVG_STROKE|NVG_CAPS, strokeWidth*0.5f + NVG_AA/2.0f); + + ctx->params.renderStroke(ctx->params.userPtr, &state->stroke, &state->scissor, NVG_AA, + strokeWidth, ctx->cache->paths, ctx->cache->npaths); + + // Count triangles + for (i = 0; i < ctx->cache->npaths; i++) { + path = &ctx->cache->paths[i]; + ctx->strokeTriCount += path->nstroke-2; + ctx->drawCallCount++; + } +} + +// Add fonts +int nvgCreateFont(struct NVGcontext* ctx, const char* name, const char* path) +{ + return fonsAddFont(ctx->fs, name, path); +} + +int nvgCreateFontMem(struct NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData) +{ + return fonsAddFontMem(ctx->fs, name, data, ndata, freeData); +} + +// State setting +void nvgFontSize(struct NVGcontext* ctx, float size) +{ + struct NVGstate* state = nvg__getState(ctx); + state->fontSize = size; +} + +void nvgLetterSpacing(struct NVGcontext* ctx, float spacing) +{ + struct NVGstate* state = nvg__getState(ctx); + state->letterSpacing = spacing; +} + +void nvgFontBlur(struct NVGcontext* ctx, float blur) +{ + struct NVGstate* state = nvg__getState(ctx); + state->fontBlur = blur; +} + +void nvgTextAlign(struct NVGcontext* ctx, int align) +{ + struct NVGstate* state = nvg__getState(ctx); + state->textAlign = align; +} + +void nvgFontFaceId(struct NVGcontext* ctx, int font) +{ + struct NVGstate* state = nvg__getState(ctx); + state->fontId = font; +} + +void nvgFontFace(struct NVGcontext* ctx, const char* font) +{ + struct NVGstate* state = nvg__getState(ctx); + state->fontId = fonsGetFontByName(ctx->fs, font); +} + +void nvgText(struct NVGcontext* ctx, float x, float y, const char* string) +{ + struct NVGstate* state = nvg__getState(ctx); + struct FONStextIter iter; + struct FONSquad q; + struct NVGvertex* verts; + float scale = nvg__minf(nvg__getAverageScale(state->xform), 4.0f); + float invscale = 1.0f / scale; + int dirty[4]; + int cverts = 0; + int nverts = 0; + + if (state->fontId == FONS_INVALID) return; + + fonsSetSize(ctx->fs, state->fontSize*scale); + fonsSetSpacing(ctx->fs, state->letterSpacing*scale); + fonsSetBlur(ctx->fs, state->fontBlur*scale); + fonsSetAlign(ctx->fs, state->textAlign); + fonsSetFont(ctx->fs, state->fontId); + + cverts = nvg__maxi(2, strlen(string)) * 6; // conservative estimate. + verts = nvg__allocTempVerts(ctx, cverts); + if (verts == NULL) return; + + fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string); + while (fonsTextIterNext(ctx->fs, &iter, &q)) { + // Trasnform corners. + float c[4*2]; + nvg__xformPt(&c[0],&c[1], q.x0*invscale, q.y0*invscale, state->xform); + nvg__xformPt(&c[2],&c[3], q.x1*invscale, q.y0*invscale, state->xform); + nvg__xformPt(&c[4],&c[5], q.x1*invscale, q.y1*invscale, state->xform); + nvg__xformPt(&c[6],&c[7], q.x0*invscale, q.y1*invscale, state->xform); + // Create triangles + if (nverts+6 <= cverts) { + nvg__vset(&verts[nverts], c[0], c[1], q.s0, q.t0); nverts++; + nvg__vset(&verts[nverts], c[4], c[5], q.s1, q.t1); nverts++; + nvg__vset(&verts[nverts], c[2], c[3], q.s1, q.t0); nverts++; + nvg__vset(&verts[nverts], c[0], c[1], q.s0, q.t0); nverts++; + nvg__vset(&verts[nverts], c[6], c[7], q.s0, q.t1); nverts++; + nvg__vset(&verts[nverts], c[4], c[5], q.s1, q.t1); nverts++; + } + } + + if (fonsValidateTexture(ctx->fs, dirty)) { + // Update texture + if (ctx->fontImage != 0) { + int iw, ih; + const unsigned char* data = fonsGetTextureData(ctx->fs, &iw, &ih); + int x = dirty[0]; + int y = dirty[1]; + int w = dirty[2] - dirty[0]; + int h = dirty[3] - dirty[1]; + ctx->params.renderUpdateTexture(ctx->params.userPtr, ctx->fontImage, x,y, w,h, data); + } + } + + // Render triangles. + ctx->params.renderTriangles(ctx->params.userPtr, &state->fill, &state->scissor, ctx->fontImage, verts, nverts); + + ctx->drawCallCount++; + ctx->textTriCount += nverts/3; +} + +void nvgTextBounds(struct NVGcontext* ctx, const char* string, float* width, float* bounds) +{ + struct NVGstate* state = nvg__getState(ctx); + if (state->fontId == FONS_INVALID) return; + + fonsSetSize(ctx->fs, state->fontSize); + fonsSetSpacing(ctx->fs, state->letterSpacing); + fonsSetBlur(ctx->fs, state->fontBlur); + fonsSetAlign(ctx->fs, state->textAlign); + fonsSetFont(ctx->fs, state->fontId); + + fonsTextBounds(ctx->fs, string, width, bounds); +} + +void nvgVertMetrics(struct NVGcontext* ctx, float* ascender, float* descender, float* lineh) +{ + struct NVGstate* state = nvg__getState(ctx); + if (state->fontId == FONS_INVALID) return; + + fonsSetSize(ctx->fs, state->fontSize); + fonsSetSpacing(ctx->fs, state->letterSpacing); + fonsSetBlur(ctx->fs, state->fontBlur); + fonsSetAlign(ctx->fs, state->textAlign); + fonsSetFont(ctx->fs, state->fontId); + + fonsVertMetrics(ctx->fs, ascender, descender, lineh); +} diff --git a/src/nanovg.h b/src/nanovg.h new file mode 100644 index 0000000..5b69f1c --- /dev/null +++ b/src/nanovg.h @@ -0,0 +1,194 @@ +// +// Copyright (c) 2013 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 NANOVG_H +#define NANOVG_H + +#define NVG_PI 3.14159265358979323846264338327f + +enum NVGdir { + NVG_CCW = 1, + NVG_CW = 2, +}; +enum NVGdir2 { + NVG_SOLID = 1, // ccw + NVG_HOLE = 2, // cw +}; + +enum NVGpatternRepeat { + NVG_REPEATX = 0x01, + NVG_REPEATY = 0x02, +}; + +enum NVGaling { + // Horizontal align + NVG_ALIGN_LEFT = 1<<0, // Default + NVG_ALIGN_CENTER = 1<<1, + NVG_ALIGN_RIGHT = 1<<2, + // Vertical align + NVG_ALIGN_TOP = 1<<3, + NVG_ALIGN_MIDDLE = 1<<4, + NVG_ALIGN_BOTTOM = 1<<5, + NVG_ALIGN_BASELINE = 1<<6, // Default +}; + + +// Used by the rendering API +enum NVGtexture { + NVG_TEXTURE_ALPHA = 0x01, + NVG_TEXTURE_RGBA = 0x02, +}; + +struct NVGpaint +{ + float xform[6]; + float extent[2]; + float radius; + float feather; + unsigned int innerColor; + unsigned int outerColor; + int image; + int repeat; +}; + +struct NVGscissor +{ + float xform[6]; + float extent[2]; +}; + +struct NVGvertex { + float x,y,u,v; +}; + +struct NVGpath { + int first; + int count; + unsigned char closed; + int nbevel; + struct NVGvertex* fill; + int nfill; + struct NVGvertex* stroke; + int nstroke; + int winding; +}; + +struct NVGparams { + void* userPtr; + int (*renderCreate)(void* uptr); + int (*renderCreateTexture)(void* uptr, int type, int w, int h, const unsigned char* data); + int (*renderDeleteTexture)(void* uptr, int image); + int (*renderUpdateTexture)(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data); + int (*renderGetTextureSize)(void* uptr, int image, int* w, int* h); + void (*renderFill)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float aasize, const float* bounds, const struct NVGpath* paths, int npaths); + void (*renderStroke)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float aasize, float strokeWidth, const struct NVGpath* paths, int npaths); + void (*renderTriangles)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, int image, const struct NVGvertex* verts, int nverts); + void (*renderDelete)(void* uptr); +}; + +// Contructor and destructor. +struct NVGcontext* nvgCreateInternal(struct NVGparams* params); +void nvgDeleteInternal(struct NVGcontext* ctx); + +// Color utils +unsigned int nvgRGB(unsigned char r, unsigned char g, unsigned char b); +unsigned int nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a); +unsigned int nvgLerpRGBA(unsigned int c0, unsigned int c1, float u); + +// State handling +void nvgSave(struct NVGcontext* ctx); +void nvgRestore(struct NVGcontext* ctx); +void nvgReset(struct NVGcontext* ctx); + +// State setting +void nvgStrokeColor(struct NVGcontext* ctx, unsigned int color); +void nvgStrokePaint(struct NVGcontext* ctx, struct NVGpaint paint); + +void nvgFillColor(struct NVGcontext* ctx, unsigned int color); +void nvgFillPaint(struct NVGcontext* ctx, struct NVGpaint paint); + +void nvgMiterLimit(struct NVGcontext* ctx, float limit); +void nvgStrokeWidth(struct NVGcontext* ctx, float size); + +void nvgResetTransform(struct NVGcontext* ctx); +void nvgTransform(struct NVGcontext* ctx, float a, float b, float c, float d, float e, float f); +void nvgTranslate(struct NVGcontext* ctx, float x, float y); +void nvgRotate(struct NVGcontext* ctx, float angle); +void nvgScale(struct NVGcontext* ctx, float x, float y); + +// Images +int nvgCreateImage(struct NVGcontext* ctx, const char* filename); +int nvgCreateImageMem(struct NVGcontext* ctx, unsigned char* data, int ndata, int freeData); +int nvgCreateImageRGBA(struct NVGcontext* ctx, int w, int h, const unsigned char* data); +void nvgUpdateImage(struct NVGcontext* ctx, int image, const unsigned char* data); +void nvgImageSize(struct NVGcontext* ctx, int image, int* w, int* h); +void nvgDeleteImage(struct NVGcontext* ctx, int image); + +// Paints +struct NVGpaint nvgLinearGradient(struct NVGcontext* ctx, float sx, float sy, float ex, float ey, unsigned int icol, unsigned int ocol); +struct NVGpaint nvgBoxGradient(struct NVGcontext* ctx, float x, float y, float w, float h, float r, float f, unsigned int icol, unsigned int ocol); +struct NVGpaint nvgRadialGradient(struct NVGcontext* ctx, float cx, float cy, float inr, float outr, unsigned int icol, unsigned int ocol); +struct NVGpaint nvgImagePattern(struct NVGcontext* ctx, float ox, float oy, float ex, float ey, float angle, int image, int repeat); + +// Scissoring +void nvgScissor(struct NVGcontext* ctx, float x, float y, float w, float h); +void nvgResetScissor(struct NVGcontext* ctx); + +// Draw +void nvgBeginFrame(struct NVGcontext* ctx); + +void nvgBeginPath(struct NVGcontext* ctx); +void nvgMoveTo(struct NVGcontext* ctx, float x, float y); +void nvgLineTo(struct NVGcontext* ctx, float x, float y); +void nvgBezierTo(struct NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y); +void nvgArcTo(struct NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius); +void nvgClosePath(struct NVGcontext* ctx); +void nvgPathWinding(struct NVGcontext* ctx, int dir); + +void nvgArc(struct NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir); +void nvgRect(struct NVGcontext* ctx, float x, float y, float w, float h); +void nvgRoundedRect(struct NVGcontext* ctx, float x, float y, float w, float h, float r); +void nvgEllipse(struct NVGcontext* ctx, float cx, float cy, float rx, float ry); +void nvgCircle(struct NVGcontext* ctx, float cx, float cy, float r); + +void nvgFill(struct NVGcontext* ctx); +void nvgStroke(struct NVGcontext* ctx); + +// Text + +// Add fonts +int nvgCreateFont(struct NVGcontext* ctx, const char* name, const char* path); +int nvgCreateFontMem(struct NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData); + +// State setting +void nvgFontSize(struct NVGcontext* ctx, float size); +void nvgLetterSpacing(struct NVGcontext* ctx, float spacing); +void nvgFontBlur(struct NVGcontext* ctx, float blur); +void nvgTextAlign(struct NVGcontext* ctx, int align); +void nvgFontFaceId(struct NVGcontext* ctx, int font); +void nvgFontFace(struct NVGcontext* ctx, const char* font); + +// Draw text +void nvgText(struct NVGcontext* ctx, float x, float y, const char* string); + +// Measure text +void nvgTextBounds(struct NVGcontext* ctx, const char* string, float* width, float* bounds); +void nvgVertMetrics(struct NVGcontext* ctx, float* ascender, float* descender, float* lineh); + + +#endif // NANOVG_H diff --git a/src/stb_image.c b/src/stb_image.c new file mode 100644 index 0000000..098b91a --- /dev/null +++ b/src/stb_image.c @@ -0,0 +1,4673 @@ +/* stbi-1.33 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c + when you control the images you're loading + no warranty implied; use at your own risk + + 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) + PNG 8-bit-per-channel only + + TGA (not sure what subset, if a subset) + BMP non-1bpp, non-RLE + PSD (composited view only, no extra channels) + + GIF (*comp always reports as 4-channel) + HDR (radiance rgbE format) + PIC (Softimage PIC) + + - decode from memory or through FILE (define STBI_NO_STDIO to remove code) + - decode from arbitrary I/O callbacks + - overridable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD) + + Latest revisions: + 1.33 (2011-07-14) minor fixes suggested by Dave Moore + 1.32 (2011-07-13) info support for all filetypes (SpartanJ) + 1.31 (2011-06-19) a few more leak fixes, bug in PNG handling (SpartanJ) + 1.30 (2011-06-11) added ability to load files via io callbacks (Ben Wenger) + 1.29 (2010-08-16) various warning fixes from Aurelien Pocheville + 1.28 (2010-08-01) fix bug in GIF palette transparency (SpartanJ) + 1.27 (2010-08-01) cast-to-uint8 to fix warnings (Laurent Gomila) + allow trailing 0s at end of image data (Laurent Gomila) + 1.26 (2010-07-24) fix bug in file buffering for PNG reported by SpartanJ + + See end of file for full revision history. + + TODO: + stbi_info support for BMP,PSD,HDR,PIC + + + ============================ Contributors ========================= + + Image formats Optimizations & bugfixes + Sean Barrett (jpeg, png, bmp) Fabian "ryg" Giesen + Nicolas Schulz (hdr, psd) + Jonathan Dummer (tga) Bug fixes & warning fixes + Jean-Marc Lienher (gif) Marc LeBlanc + Tom Seddon (pic) Christpher Lloyd + Thatcher Ulrich (psd) Dave Moore + Won Chun + the Horde3D community + Extensions, features Janez Zemva + Jetro Lauha (stbi_info) Jonathan Blow + James "moose2000" Brown (iPhone PNG) Laurent Gomila + Ben "Disch" Wenger (io callbacks) Aruelien Pocheville + Martin "SpartanJ" Golini Ryamond Barbiero + David Woo + + + If your name should be here but isn't, let Sean know. + +*/ + +#ifndef STBI_INCLUDE_STB_IMAGE_H +#define STBI_INCLUDE_STB_IMAGE_H + +// To get a header file for this, either cut and paste the header, +// or create stb_image.h, #define STBI_HEADER_FILE_ONLY, and +// then include stb_image.c from it. + +//// begin header file //////////////////////////////////////////////////// +// +// Limitations: +// - no jpeg progressive support +// - non-HDR formats support 8-bit samples only (jpeg, png) +// - no delayed line count (jpeg) -- IJG doesn't support either +// - no 1-bit BMP +// - GIF always returns *comp=4 +// +// 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 +// // ... but 'n' will always be the number that it would have been if you said 0 +// 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, BMP, GIF, and PIC images are automatically depalettized. +// +// =========================================================================== +// +// iPhone PNG support: +// +// By default we convert iphone-formatted PNGs back to RGB; nominally they +// would silently load as BGR, except the existing code should have just +// failed on such iPhone PNGs. But you can disable this conversion by +// by calling stbi_convert_iphone_png_to_rgb(0), in which case +// you will always just get the native iphone "format" through. +// +// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per +// pixel to remove any premultiplied alpha *only* if the image file explicitly +// says there's premultiplied data (currently only happens in iPhone images, +// and only if iPhone convert-to-rgb processing is on). +// +// =========================================================================== +// +// 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); +// +// =========================================================================== +// +// I/O callbacks +// +// I/O callbacks allow you to read from arbitrary sources, like packaged +// files or some other source. Data read from callbacks are processed +// through a small internal buffer (currently 128 bytes) to try to reduce +// overhead. +// +// The three functions you must define are "read" (reads some bytes of data), +// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end). + + +#ifndef STBI_NO_STDIO + +#if defined(_MSC_VER) && _MSC_VER >= 0x1400 +#define _CRT_SECURE_NO_WARNINGS // suppress bogus warnings about fopen() +#endif + +#include +#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 + +////////////////////////////////////////////////////////////////////////////// +// +// PRIMARY API - works on images of any type +// + +// +// load image by filename, open file, or memory buffer +// + +extern stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); + +#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); +// for stbi_load_from_file, file pointer is left pointing immediately after image +#endif + +typedef struct +{ + int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read + void (*skip) (void *user,unsigned n); // skip the next 'n' bytes + int (*eof) (void *user); // returns nonzero if we are at end of file/data +} stbi_io_callbacks; + +extern stbi_uc *stbi_load_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp); + +#ifndef STBI_NO_HDR + extern float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); + + #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_callbacks (stbi_io_callbacks const *clbk, void *user, 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 + +// stbi_is_hdr is always defined +extern int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user); +extern int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len); +#ifndef STBI_NO_STDIO +extern int stbi_is_hdr (char const *filename); +extern int stbi_is_hdr_from_file(FILE *f); +#endif // STBI_NO_STDIO + + +// get a VERY brief reason for failure +// NOT THREADSAFE +extern const 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_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp); + +#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 + + + +// for image formats that explicitly notate that they have premultiplied alpha, +// we just return the colors as stored in the file. set this flag to force +// unpremultiplication. results are undefined if the unpremultiply overflow. +extern void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply); + +// indicate whether we should process iphone images back to canonical format, +// or just pass them through "as-is" +extern void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert); + + +// 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); + + +// define faster low-level operations (typically SIMD support) +#ifdef STBI_SIMD +typedef void (*stbi_idct_8x8)(stbi_uc *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)(stbi_uc *output, stbi_uc const *y, stbi_uc const *cb, stbi_uc 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 + +#ifndef STBI_HEADER_FILE_ONLY + +#ifndef STBI_NO_HDR +#include // ldexp +#include // strcmp, strtok +#endif + +#ifndef STBI_NO_STDIO +#include +#endif +#include +#include +#include +#include + +#ifndef _MSC_VER + #ifdef __cplusplus + #define stbi_inline inline + #else + #define stbi_inline + #endif +#else + #define stbi_inline __forceinline +#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 ? 1 : -1]; + +#if defined(STBI_NO_STDIO) && !defined(STBI_NO_WRITE) +#define STBI_NO_WRITE +#endif + +#define STBI_NOTUSED(v) (void)sizeof(v) + +#ifdef _MSC_VER +#define STBI_HAS_LROTL +#endif + +#ifdef STBI_HAS_LROTL + #define stbi_lrot(x,y) _lrotl(x,y) +#else + #define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (32 - (y)))) +#endif + +/////////////////////////////////////////////// +// +// stbi struct and start_xxx functions + +// stbi structure is our basic context used by all images, so it +// contains all the IO context, plus some basic image information +typedef struct +{ + uint32 img_x, img_y; + int img_n, img_out_n; + + stbi_io_callbacks io; + void *io_user_data; + + int read_from_callbacks; + int buflen; + uint8 buffer_start[128]; + + uint8 *img_buffer, *img_buffer_end; + uint8 *img_buffer_original; +} stbi; + + +static void refill_buffer(stbi *s); + +// initialize a memory-decode context +static void start_mem(stbi *s, uint8 const *buffer, int len) +{ + s->io.read = NULL; + s->read_from_callbacks = 0; + s->img_buffer = s->img_buffer_original = (uint8 *) buffer; + s->img_buffer_end = (uint8 *) buffer+len; +} + +// initialize a callback-based context +static void start_callbacks(stbi *s, stbi_io_callbacks *c, void *user) +{ + s->io = *c; + s->io_user_data = user; + s->buflen = sizeof(s->buffer_start); + s->read_from_callbacks = 1; + s->img_buffer_original = s->buffer_start; + refill_buffer(s); +} + +#ifndef STBI_NO_STDIO + +static int stdio_read(void *user, char *data, int size) +{ + return (int) fread(data,1,size,(FILE*) user); +} + +static void stdio_skip(void *user, unsigned n) +{ + fseek((FILE*) user, n, SEEK_CUR); +} + +static int stdio_eof(void *user) +{ + return feof((FILE*) user); +} + +static stbi_io_callbacks stbi_stdio_callbacks = +{ + stdio_read, + stdio_skip, + stdio_eof, +}; + +static void start_file(stbi *s, FILE *f) +{ + start_callbacks(s, &stbi_stdio_callbacks, (void *) f); +} + +//static void stop_file(stbi *s) { } + +#endif // !STBI_NO_STDIO + +static void stbi_rewind(stbi *s) +{ + // conceptually rewind SHOULD rewind to the beginning of the stream, + // but we just rewind to the beginning of the initial buffer, because + // we only use it after doing 'test', which only ever looks at at most 92 bytes + s->img_buffer = s->img_buffer_original; +} + +static int stbi_jpeg_test(stbi *s); +static stbi_uc *stbi_jpeg_load(stbi *s, int *x, int *y, int *comp, int req_comp); +static int stbi_jpeg_info(stbi *s, int *x, int *y, int *comp); +static int stbi_png_test(stbi *s); +static stbi_uc *stbi_png_load(stbi *s, int *x, int *y, int *comp, int req_comp); +static int stbi_png_info(stbi *s, int *x, int *y, int *comp); +static int stbi_bmp_test(stbi *s); +static stbi_uc *stbi_bmp_load(stbi *s, int *x, int *y, int *comp, int req_comp); +static int stbi_tga_test(stbi *s); +static stbi_uc *stbi_tga_load(stbi *s, int *x, int *y, int *comp, int req_comp); +static int stbi_tga_info(stbi *s, int *x, int *y, int *comp); +static int stbi_psd_test(stbi *s); +static stbi_uc *stbi_psd_load(stbi *s, int *x, int *y, int *comp, int req_comp); +static int stbi_hdr_test(stbi *s); +static float *stbi_hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp); +static int stbi_pic_test(stbi *s); +static stbi_uc *stbi_pic_load(stbi *s, int *x, int *y, int *comp, int req_comp); +static int stbi_gif_test(stbi *s); +static stbi_uc *stbi_gif_load(stbi *s, int *x, int *y, int *comp, int req_comp); +static int stbi_gif_info(stbi *s, int *x, int *y, int *comp); + + +// this is not threadsafe +static const char *failure_reason; + +const char *stbi_failure_reason(void) +{ + return failure_reason; +} + +static int e(const char *str) +{ + failure_reason = str; + return 0; +} + +// e - error +// epf - error returning pointer to float +// epuc - error returning pointer to unsigned char + +#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); +} + +#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 + +static unsigned char *stbi_load_main(stbi *s, int *x, int *y, int *comp, int req_comp) +{ + if (stbi_jpeg_test(s)) return stbi_jpeg_load(s,x,y,comp,req_comp); + if (stbi_png_test(s)) return stbi_png_load(s,x,y,comp,req_comp); + if (stbi_bmp_test(s)) return stbi_bmp_load(s,x,y,comp,req_comp); + if (stbi_gif_test(s)) return stbi_gif_load(s,x,y,comp,req_comp); + if (stbi_psd_test(s)) return stbi_psd_load(s,x,y,comp,req_comp); + if (stbi_pic_test(s)) return stbi_pic_load(s,x,y,comp,req_comp); + + #ifndef STBI_NO_HDR + if (stbi_hdr_test(s)) { + float *hdr = stbi_hdr_load(s, x,y,comp,req_comp); + return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); + } + #endif + + // test tga last because it's a crappy test! + if (stbi_tga_test(s)) + return stbi_tga_load(s,x,y,comp,req_comp); + return epuc("unknown image type", "Image not of any known type, or corrupt"); +} + +#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) +{ + stbi s; + start_file(&s,f); + return stbi_load_main(&s,x,y,comp,req_comp); +} +#endif //!STBI_NO_STDIO + +unsigned char *stbi_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 stbi_load_main(&s,x,y,comp,req_comp); +} + +unsigned char *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) +{ + stbi s; + start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi_load_main(&s,x,y,comp,req_comp); +} + +#ifndef STBI_NO_HDR + +float *stbi_loadf_main(stbi *s, int *x, int *y, int *comp, int req_comp) +{ + unsigned char *data; + #ifndef STBI_NO_HDR + if (stbi_hdr_test(s)) + return stbi_hdr_load(s,x,y,comp,req_comp); + #endif + data = stbi_load_main(s, 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"); +} + +float *stbi_loadf_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 stbi_loadf_main(&s,x,y,comp,req_comp); +} + +float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) +{ + stbi s; + start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi_loadf_main(&s,x,y,comp,req_comp); +} + +#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) +{ + stbi s; + start_file(&s,f); + return stbi_loadf_main(&s,x,y,comp,req_comp); +} +#endif // !STBI_NO_STDIO + +#endif // !STBI_NO_HDR + +// 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 + stbi s; + start_mem(&s,buffer,len); + return stbi_hdr_test(&s); + #else + STBI_NOTUSED(buffer); + STBI_NOTUSED(len); + 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 + stbi s; + start_file(&s,f); + return stbi_hdr_test(&s); + #else + return 0; + #endif +} +#endif // !STBI_NO_STDIO + +extern int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user) +{ + #ifndef STBI_NO_HDR + stbi s; + start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi_hdr_test(&s); + #else + return 0; + #endif +} + +#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 +}; + +static void refill_buffer(stbi *s) +{ + int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen); + if (n == 0) { + // at end of file, treat same as if from memory + s->read_from_callbacks = 0; + s->img_buffer = s->img_buffer_end-1; + *s->img_buffer = 0; + } else { + s->img_buffer = s->buffer_start; + s->img_buffer_end = s->buffer_start + n; + } +} + +stbi_inline static int get8(stbi *s) +{ + if (s->img_buffer < s->img_buffer_end) + return *s->img_buffer++; + if (s->read_from_callbacks) { + refill_buffer(s); + return *s->img_buffer++; + } + return 0; +} + +stbi_inline static int at_eof(stbi *s) +{ + if (s->io.read) { + if (!(s->io.eof)(s->io_user_data)) return 0; + // if feof() is true, check if buffer = end + // special case: we've only got the special 0 character at the end + if (s->read_from_callbacks == 0) return 1; + } + + return s->img_buffer >= s->img_buffer_end; +} + +stbi_inline static uint8 get8u(stbi *s) +{ + return (uint8) get8(s); +} + +static void skip(stbi *s, int n) +{ + if (s->io.read) { + int blen = s->img_buffer_end - s->img_buffer; + if (blen < n) { + s->img_buffer = s->img_buffer_end; + (s->io.skip)(s->io_user_data, n - blen); + return; + } + } + s->img_buffer += n; +} + +static int getn(stbi *s, stbi_uc *buffer, int n) +{ + if (s->io.read) { + int blen = s->img_buffer_end - s->img_buffer; + if (blen < n) { + int res, count; + + memcpy(buffer, s->img_buffer, blen); + + count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen); + res = (count == (n-blen)); + s->img_buffer = s->img_buffer_end; + return res; + } + } + + if (s->img_buffer+n <= s->img_buffer_end) { + memcpy(buffer, s->img_buffer, n); + s->img_buffer += n; + return 1; + } else + return 0; +} + +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); +} + +////////////////////////////////////////////////////////////////////////////// +// +// 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] = (uint8) 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] = (uint8) 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 +{ + #ifdef 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 |= b << (24 - j->code_bits); + 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 +stbi_inline 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 >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); + k = h->fast[c]; + if (k < 255) { + int s = h->size[k]; + if (s > j->code_bits) + return -1; + j->code_buffer <<= s; + j->code_bits -= s; + 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. + temp = j->code_buffer >> 16; + 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 >> (32 - k)) & bmask[k]) + h->delta[k]; + assert((((j->code_buffer) >> (32 - h->size[c])) & bmask[h->size[c]]) == h->code[c]); + + // convert the id to a symbol + j->code_bits -= k; + j->code_buffer <<= k; + return h->values[c]; +} + +// combined JPEG 'receive' and JPEG 'extend', since baseline +// always extends everything it receives. +stbi_inline 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); + + #if 1 + k = stbi_lrot(j->code_buffer, n); + j->code_buffer = k & ~bmask[n]; + k &= bmask[n]; + j->code_bits -= n; + #else + k = (j->code_buffer >> (32 - n)) & bmask[n]; + j->code_bits -= n; + j->code_buffer <<= n; + #endif + // 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 +stbi_inline static uint8 clamp(int x) +{ + // 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; + +#ifdef STBI_SIMD +typedef unsigned short stbi_dequantize_t; +#else +typedef uint8 stbi_dequantize_t; +#endif + +// .344 seconds on 3*anemones.jpg +static void idct_block(uint8 *out, int out_stride, short data[64], stbi_dequantize_t *dequantize) +{ + int i,val[64],*v=val; + stbi_dequantize_t *dq = dequantize; + uint8 *o; + 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. + // so we want to round that, which means adding 0.5 * 1<<17, + // aka 65536. Also, we'll end up with -128 to 127 that we want + // to encode as 0..255 by adding 128, so we'll add that before the shift + x0 += 65536 + (128<<17); + x1 += 65536 + (128<<17); + x2 += 65536 + (128<<17); + x3 += 65536 + (128<<17); + // tried computing the shifts into temps, or'ing the temps to see + // if any were out of range, but that was slower + 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); + } +} + +#ifdef STBI_SIMD +static stbi_idct_8x8 stbi_idct_installed = idct_block; + +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; + #ifdef 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; + #ifdef 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; + #ifdef 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); + #ifdef STBI_SIMD + for (i=0; i < 64; ++i) + z->dequant2[t][i] = z->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; + if (j->marker == MARKER_none ) { + // handle 0s at the end of image data from IP Kamera 9060 + while (!at_eof(j->s)) { + int x = get8(j->s); + if (x == 255) { + j->marker = get8u(j->s); + break; + } else if (x != 0) { + return 0; + } + } + // if we reach eof without hitting a marker, get_marker() below will fail and we'll eventually 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) +{ + STBI_NOTUSED(out); + STBI_NOTUSED(in_far); + STBI_NOTUSED(w); + STBI_NOTUSED(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; + STBI_NOTUSED(hs); + 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]; + + STBI_NOTUSED(in_far); + STBI_NOTUSED(hs); + + 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); + + STBI_NOTUSED(hs); + + 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; + in_far = in_far; + 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, const uint8 *y, const uint8 *pcb, const 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; + } +} + +#ifdef 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) { + #ifdef 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; + } +} + +static unsigned char *stbi_jpeg_load(stbi *s, int *x, int *y, int *comp, int req_comp) +{ + jpeg j; + j.s = s; + return load_jpeg_image(&j, x,y,comp,req_comp); +} + +static int stbi_jpeg_test(stbi *s) +{ + int r; + jpeg j; + j.s = s; + r = decode_jpeg_header(&j, SCAN_type); + stbi_rewind(s); + return r; +} + +static int stbi_jpeg_info_raw(jpeg *j, int *x, int *y, int *comp) +{ + if (!decode_jpeg_header(j, SCAN_header)) { + stbi_rewind( j->s ); + return 0; + } + if (x) *x = j->s->img_x; + if (y) *y = j->s->img_y; + if (comp) *comp = j->s->img_n; + return 1; +} + +static int stbi_jpeg_info(stbi *s, int *x, int *y, int *comp) +{ + jpeg j; + j.s = s; + return stbi_jpeg_info_raw(&j, x, y, 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; + +stbi_inline 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; +} + +stbi_inline 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; + +stbi_inline 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); +} + +stbi_inline 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; +} + +stbi_inline 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 }; + zhuffman z_codelength; + 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; +} + +int stbi_png_partial; // a quick hack to only allow decoding some of a PNG... I should implement real streaming support instead +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; + } + if (stbi_png_partial && a->zout - a->zout_start > 65536) + break; + } 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); +} + +char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header) +{ + 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, parse_header)) { + if (outlen) *outlen = (int) (a.zout - a.zout_start); + return a.zout_start; + } else { + free(a.zout_start); + return NULL; + } +} + +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 (get8u(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_raw(png *a, uint8 *raw, uint32 raw_len, int out_n, uint32 x, uint32 y) +{ + stbi *s = a->s; + uint32 i,j,stride = 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); + if (stbi_png_partial) y = 1; + a->out = (uint8 *) malloc(x * y * out_n); + if (!a->out) return e("outofmem", "Out of memory"); + if (!stbi_png_partial) { + if (s->img_x == x && s->img_y == y) { + if (raw_len != (img_n * x + 1) * y) return e("not enough pixels","Corrupt PNG"); + } else { // interlaced: + if (raw_len < (img_n * x + 1) * y) return e("not enough pixels","Corrupt PNG"); + } + } + for (j=0; j < 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=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=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 create_png_image(png *a, uint8 *raw, uint32 raw_len, int out_n, int interlaced) +{ + uint8 *final; + int p; + int save; + if (!interlaced) + return create_png_image_raw(a, raw, raw_len, out_n, a->s->img_x, a->s->img_y); + save = stbi_png_partial; + stbi_png_partial = 0; + + // de-interlacing + final = (uint8 *) malloc(a->s->img_x * a->s->img_y * out_n); + for (p=0; p < 7; ++p) { + int xorig[] = { 0,4,0,2,0,1,0 }; + int yorig[] = { 0,0,4,0,2,0,1 }; + int xspc[] = { 8,8,4,4,2,2,1 }; + int yspc[] = { 8,8,8,4,4,2,2 }; + int i,j,x,y; + // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1 + x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p]; + y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p]; + if (x && y) { + if (!create_png_image_raw(a, raw, raw_len, out_n, x, y)) { + free(final); + return 0; + } + for (j=0; j < y; ++j) + for (i=0; i < x; ++i) + memcpy(final + (j*yspc[p]+yorig[p])*a->s->img_x*out_n + (i*xspc[p]+xorig[p])*out_n, + a->out + (j*x+i)*out_n, out_n); + free(a->out); + raw += (x*out_n+1)*y; + raw_len -= (x*out_n+1)*y; + } + } + a->out = final; + + stbi_png_partial = save; + 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; + + STBI_NOTUSED(len); + + return 1; +} + +static int stbi_unpremultiply_on_load = 0; +static int stbi_de_iphone_flag = 0; + +void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) +{ + stbi_unpremultiply_on_load = flag_true_if_should_unpremultiply; +} +void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) +{ + stbi_de_iphone_flag = flag_true_if_should_convert; +} + +static void stbi_de_iphone(png *z) +{ + stbi *s = z->s; + uint32 i, pixel_count = s->img_x * s->img_y; + uint8 *p = z->out; + + if (s->img_out_n == 3) { // convert bgr to rgb + for (i=0; i < pixel_count; ++i) { + uint8 t = p[0]; + p[0] = p[2]; + p[2] = t; + p += 3; + } + } else { + assert(s->img_out_n == 4); + if (stbi_unpremultiply_on_load) { + // convert bgr to rgb and unpremultiply + for (i=0; i < pixel_count; ++i) { + uint8 a = p[3]; + uint8 t = p[0]; + if (a) { + p[0] = p[2] * 255 / a; + p[1] = p[1] * 255 / a; + p[2] = t * 255 / a; + } else { + p[0] = p[2]; + p[2] = t; + } + p += 4; + } + } else { + // convert bgr to rgb + for (i=0; i < pixel_count; ++i) { + uint8 t = p[0]; + p[0] = p[2]; + p[2] = t; + p += 4; + } + } + } +} + +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,interlace=0, iphone=0; + stbi *s = z->s; + + z->expanded = NULL; + z->idata = NULL; + z->out = NULL; + + if (!check_png_header(s)) return 0; + + if (scan == SCAN_type) return 1; + + for (;;) { + chunk c = get_chunk_header(s); + switch (c.type) { + case PNG_TYPE('C','g','B','I'): + iphone = stbi_de_iphone_flag; + skip(s, c.length); + break; + case PNG_TYPE('I','H','D','R'): { + int depth,color,comp,filter; + if (!first) return e("multiple IHDR","Corrupt PNG"); + first = 0; + 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>1) return e("bad interlace method","Corrupt PNG"); + 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 (first) return e("first not IHDR", "Corrupt PNG"); + 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 (first) return e("first not IHDR", "Corrupt PNG"); + 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 (first) return e("first not IHDR", "Corrupt PNG"); + 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; + } + if (!getn(s, z->idata+ioff,c.length)) return e("outofdata","Corrupt PNG"); + ioff += c.length; + break; + } + + case PNG_TYPE('I','E','N','D'): { + uint32 raw_len; + if (first) return e("first not IHDR", "Corrupt PNG"); + if (scan != SCAN_load) return 1; + if (z->idata == NULL) return e("no IDAT","Corrupt PNG"); + z->expanded = (uint8 *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, 16384, (int *) &raw_len, !iphone); + 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, interlace)) return 0; + if (has_trans) + if (!compute_transparency(z, tc, s->img_out_n)) return 0; + if (iphone && s->img_out_n > 2) + stbi_de_iphone(z); + 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 (first) return e("first not IHDR", "Corrupt PNG"); + 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; + 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; +} + +static unsigned char *stbi_png_load(stbi *s, int *x, int *y, int *comp, int req_comp) +{ + png p; + p.s = s; + return do_png(&p, x,y,comp,req_comp); +} + +static int stbi_png_test(stbi *s) +{ + int r; + r = check_png_header(s); + stbi_rewind(s); + return r; +} + +static int stbi_png_info_raw(png *p, int *x, int *y, int *comp) +{ + if (!parse_png_file(p, SCAN_header, 0)) { + stbi_rewind( p->s ); + return 0; + } + if (x) *x = p->s->img_x; + if (y) *y = p->s->img_y; + if (comp) *comp = p->s->img_n; + return 1; +} + +static int stbi_png_info(stbi *s, int *x, int *y, int *comp) +{ + png p; + p.s = s; + return stbi_png_info_raw(&p, x, y, 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; +} + +static int stbi_bmp_test(stbi *s) +{ + int r = bmp_test(s); + stbi_rewind(s); + return r; +} + + +// 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, fake_a=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"); + 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 epuc("bad BMP", "bad BMP"); + 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 = 0xffu << 16; + mg = 0xffu << 8; + mb = 0xffu << 0; + ma = 0xffu << 24; + fake_a = 1; // @TODO: check for cases like alpha value is all 0 and switch it to 255 + } else { + mr = 31u << 10; + mg = 31u << 5; + mb = 31u << 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 epuc("bad BMP", "bad BMP"); + } + } else + return epuc("bad BMP", "bad BMP"); + } + } 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] = get8u(s); + pal[i][1] = get8u(s); + pal[i][0] = get8u(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 == 0x00ff0000 && ma == 0xff000000) + easy = 2; + } + if (!easy) { + if (!mr || !mg || !mb) { free(out); 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] = get8u(s); + out[z+1] = get8u(s); + out[z+0] = get8u(s); + z += 3; + a = (easy == 2 ? get8(s) : 255); + if (target == 4) out[z++] = (uint8) a; + } + } else { + for (i=0; i < (int) s->img_x; ++i) { + uint32 v = (bpp == 16 ? get16le(s) : get32le(s)); + int a; + out[z++] = (uint8) shiftsigned(v & mr, rshift, rcount); + out[z++] = (uint8) shiftsigned(v & mg, gshift, gcount); + out[z++] = (uint8) shiftsigned(v & mb, bshift, bcount); + a = (ma ? shiftsigned(v & ma, ashift, acount) : 255); + if (target == 4) out[z++] = (uint8) 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 = s->img_n; + return out; +} + +static stbi_uc *stbi_bmp_load(stbi *s,int *x, int *y, int *comp, int req_comp) +{ + return bmp_load(s, x,y,comp,req_comp); +} + + +// Targa Truevision - TGA +// by Jonathan Dummer + +static int tga_info(stbi *s, int *x, int *y, int *comp) +{ + int tga_w, tga_h, tga_comp; + int sz; + get8u(s); // discard Offset + sz = get8u(s); // color type + if( sz > 1 ) { + stbi_rewind(s); + return 0; // only RGB or indexed allowed + } + sz = get8u(s); // image type + // only RGB or grey allowed, +/- RLE + if ((sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11)) return 0; + skip(s,9); + tga_w = get16le(s); + if( tga_w < 1 ) { + stbi_rewind(s); + return 0; // test width + } + tga_h = get16le(s); + if( tga_h < 1 ) { + stbi_rewind(s); + return 0; // test height + } + sz = get8(s); // bits per pixel + // only RGB or RGBA or grey allowed + if ((sz != 8) && (sz != 16) && (sz != 24) && (sz != 32)) { + stbi_rewind(s); + return 0; + } + tga_comp = sz; + if (x) *x = tga_w; + if (y) *y = tga_h; + if (comp) *comp = tga_comp / 8; + return 1; // seems to have passed everything +} + +int stbi_tga_info(stbi *s, int *x, int *y, int *comp) +{ + return tga_info(s, x, y, comp); +} + +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 +} + +static int stbi_tga_test(stbi *s) +{ + int res = tga_test(s); + stbi_rewind(s); + return res; +} + +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[4]; + 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; // we don't report this as a bad TGA because we don't even know if it's TGA + } + + // 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 ); + if (!tga_data) return epuc("outofmem", "Out of memory"); + + // 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 ); + if (!tga_palette) return epuc("outofmem", "Out of memory"); + if (!getn(s, tga_palette, tga_palette_len * tga_palette_bits / 8 )) { + free(tga_data); + free(tga_palette); + return epuc("bad palette", "Corrupt TGA"); + } + } + // load the data + trans_data[0] = trans_data[1] = trans_data[2] = trans_data[3] = 0; + 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; +} + +static stbi_uc *stbi_tga_load(stbi *s, int *x, int *y, int *comp, int req_comp) +{ + return tga_load(s,x,y,comp,req_comp); +} + + +// ************************************************************************************************* +// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB + +static int psd_test(stbi *s) +{ + if (get32(s) != 0x38425053) return 0; // "8BPS" + else return 1; +} + +static int stbi_psd_test(stbi *s) +{ + int r = psd_test(s); + stbi_rewind(s); + return r; +} + +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 = get8u(s); + p += 4; + len--; + } + } else if (len > 128) { + uint8 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 = get8u(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. + for (i = 0; i < pixelCount; i++) + *p = get8u(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; +} + +static stbi_uc *stbi_psd_load(stbi *s, int *x, int *y, int *comp, int req_comp) +{ + return psd_load(s,x,y,comp,req_comp); +} + +// ************************************************************************************************* +// Softimage PIC loader +// by Tom Seddon +// +// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format +// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/ + +static int pic_is4(stbi *s,const char *str) +{ + int i; + for (i=0; i<4; ++i) + if (get8(s) != (stbi_uc)str[i]) + return 0; + + return 1; +} + +static int pic_test(stbi *s) +{ + int i; + + if (!pic_is4(s,"\x53\x80\xF6\x34")) + return 0; + + for(i=0;i<84;++i) + get8(s); + + if (!pic_is4(s,"PICT")) + return 0; + + return 1; +} + +typedef struct +{ + stbi_uc size,type,channel; +} pic_packet_t; + +static stbi_uc *pic_readval(stbi *s, int channel, stbi_uc *dest) +{ + int mask=0x80, i; + + for (i=0; i<4; ++i, mask>>=1) { + if (channel & mask) { + if (at_eof(s)) return epuc("bad file","PIC file too short"); + dest[i]=get8u(s); + } + } + + return dest; +} + +static void pic_copyval(int channel,stbi_uc *dest,const stbi_uc *src) +{ + int mask=0x80,i; + + for (i=0;i<4; ++i, mask>>=1) + if (channel&mask) + dest[i]=src[i]; +} + +static stbi_uc *pic_load2(stbi *s,int width,int height,int *comp, stbi_uc *result) +{ + int act_comp=0,num_packets=0,y,chained; + pic_packet_t packets[10]; + + // this will (should...) cater for even some bizarre stuff like having data + // for the same channel in multiple packets. + do { + pic_packet_t *packet; + + if (num_packets==sizeof(packets)/sizeof(packets[0])) + return epuc("bad format","too many packets"); + + packet = &packets[num_packets++]; + + chained = get8(s); + packet->size = get8u(s); + packet->type = get8u(s); + packet->channel = get8u(s); + + act_comp |= packet->channel; + + if (at_eof(s)) return epuc("bad file","file too short (reading packets)"); + if (packet->size != 8) return epuc("bad format","packet isn't 8bpp"); + } while (chained); + + *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel? + + for(y=0; ytype) { + default: + return epuc("bad format","packet has bad compression type"); + + case 0: {//uncompressed + int x; + + for(x=0;xchannel,dest)) + return 0; + break; + } + + case 1://Pure RLE + { + int left=width, i; + + while (left>0) { + stbi_uc count,value[4]; + + count=get8u(s); + if (at_eof(s)) return epuc("bad file","file too short (pure read count)"); + + if (count > left) + count = (uint8) left; + + if (!pic_readval(s,packet->channel,value)) return 0; + + for(i=0; ichannel,dest,value); + left -= count; + } + } + break; + + case 2: {//Mixed RLE + int left=width; + while (left>0) { + int count = get8(s), i; + if (at_eof(s)) return epuc("bad file","file too short (mixed read count)"); + + if (count >= 128) { // Repeated + stbi_uc value[4]; + int i; + + if (count==128) + count = get16(s); + else + count -= 127; + if (count > left) + return epuc("bad file","scanline overrun"); + + if (!pic_readval(s,packet->channel,value)) + return 0; + + for(i=0;ichannel,dest,value); + } else { // Raw + ++count; + if (count>left) return epuc("bad file","scanline overrun"); + + for(i=0;ichannel,dest)) + return 0; + } + left-=count; + } + break; + } + } + } + } + + return result; +} + +static stbi_uc *pic_load(stbi *s,int *px,int *py,int *comp,int req_comp) +{ + stbi_uc *result; + int i, x,y; + + for (i=0; i<92; ++i) + get8(s); + + x = get16(s); + y = get16(s); + if (at_eof(s)) return epuc("bad file","file too short (pic header)"); + if ((1 << 28) / x < y) return epuc("too large", "Image too large to decode"); + + get32(s); //skip `ratio' + get16(s); //skip `fields' + get16(s); //skip `pad' + + // intermediate buffer is RGBA + result = (stbi_uc *) malloc(x*y*4); + memset(result, 0xff, x*y*4); + + if (!pic_load2(s,x,y,comp, result)) { + free(result); + result=0; + } + *px = x; + *py = y; + if (req_comp == 0) req_comp = *comp; + result=convert_format(result,4,req_comp,x,y); + + return result; +} + +static int stbi_pic_test(stbi *s) +{ + int r = pic_test(s); + stbi_rewind(s); + return r; +} + +static stbi_uc *stbi_pic_load(stbi *s, int *x, int *y, int *comp, int req_comp) +{ + return pic_load(s,x,y,comp,req_comp); +} + +// ************************************************************************************************* +// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb +typedef struct stbi_gif_lzw_struct { + int16 prefix; + uint8 first; + uint8 suffix; +} stbi_gif_lzw; + +typedef struct stbi_gif_struct +{ + int w,h; + stbi_uc *out; // output buffer (always 4 components) + int flags, bgindex, ratio, transparent, eflags; + uint8 pal[256][4]; + uint8 lpal[256][4]; + stbi_gif_lzw codes[4096]; + uint8 *color_table; + int parse, step; + int lflags; + int start_x, start_y; + int max_x, max_y; + int cur_x, cur_y; + int line_size; +} stbi_gif; + +static int gif_test(stbi *s) +{ + int sz; + if (get8(s) != 'G' || get8(s) != 'I' || get8(s) != 'F' || get8(s) != '8') return 0; + sz = get8(s); + if (sz != '9' && sz != '7') return 0; + if (get8(s) != 'a') return 0; + return 1; +} + +static int stbi_gif_test(stbi *s) +{ + int r = gif_test(s); + stbi_rewind(s); + return r; +} + +static void stbi_gif_parse_colortable(stbi *s, uint8 pal[256][4], int num_entries, int transp) +{ + int i; + for (i=0; i < num_entries; ++i) { + pal[i][2] = get8u(s); + pal[i][1] = get8u(s); + pal[i][0] = get8u(s); + pal[i][3] = transp ? 0 : 255; + } +} + +static int stbi_gif_header(stbi *s, stbi_gif *g, int *comp, int is_info) +{ + uint8 version; + if (get8(s) != 'G' || get8(s) != 'I' || get8(s) != 'F' || get8(s) != '8') + return e("not GIF", "Corrupt GIF"); + + version = get8u(s); + if (version != '7' && version != '9') return e("not GIF", "Corrupt GIF"); + if (get8(s) != 'a') return e("not GIF", "Corrupt GIF"); + + failure_reason = ""; + g->w = get16le(s); + g->h = get16le(s); + g->flags = get8(s); + g->bgindex = get8(s); + g->ratio = get8(s); + g->transparent = -1; + + if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments + + if (is_info) return 1; + + if (g->flags & 0x80) + stbi_gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1); + + return 1; +} + +static int stbi_gif_info_raw(stbi *s, int *x, int *y, int *comp) +{ + stbi_gif g; + if (!stbi_gif_header(s, &g, comp, 1)) { + stbi_rewind( s ); + return 0; + } + if (x) *x = g.w; + if (y) *y = g.h; + return 1; +} + +static void stbi_out_gif_code(stbi_gif *g, uint16 code) +{ + uint8 *p, *c; + + // recurse to decode the prefixes, since the linked-list is backwards, + // and working backwards through an interleaved image would be nasty + if (g->codes[code].prefix >= 0) + stbi_out_gif_code(g, g->codes[code].prefix); + + if (g->cur_y >= g->max_y) return; + + p = &g->out[g->cur_x + g->cur_y]; + c = &g->color_table[g->codes[code].suffix * 4]; + + if (c[3] >= 128) { + p[0] = c[2]; + p[1] = c[1]; + p[2] = c[0]; + p[3] = c[3]; + } + g->cur_x += 4; + + if (g->cur_x >= g->max_x) { + g->cur_x = g->start_x; + g->cur_y += g->step; + + while (g->cur_y >= g->max_y && g->parse > 0) { + g->step = (1 << g->parse) * g->line_size; + g->cur_y = g->start_y + (g->step >> 1); + --g->parse; + } + } +} + +static uint8 *stbi_process_gif_raster(stbi *s, stbi_gif *g) +{ + uint8 lzw_cs; + int32 len, code; + uint32 first; + int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear; + stbi_gif_lzw *p; + + lzw_cs = get8u(s); + clear = 1 << lzw_cs; + first = 1; + codesize = lzw_cs + 1; + codemask = (1 << codesize) - 1; + bits = 0; + valid_bits = 0; + for (code = 0; code < clear; code++) { + g->codes[code].prefix = -1; + g->codes[code].first = (uint8) code; + g->codes[code].suffix = (uint8) code; + } + + // support no starting clear code + avail = clear+2; + oldcode = -1; + + len = 0; + for(;;) { + if (valid_bits < codesize) { + if (len == 0) { + len = get8(s); // start new block + if (len == 0) + return g->out; + } + --len; + bits |= (int32) get8(s) << valid_bits; + valid_bits += 8; + } else { + int32 code = bits & codemask; + bits >>= codesize; + valid_bits -= codesize; + // @OPTIMIZE: is there some way we can accelerate the non-clear path? + if (code == clear) { // clear code + codesize = lzw_cs + 1; + codemask = (1 << codesize) - 1; + avail = clear + 2; + oldcode = -1; + first = 0; + } else if (code == clear + 1) { // end of stream code + skip(s, len); + while ((len = get8(s)) > 0) + skip(s,len); + return g->out; + } else if (code <= avail) { + if (first) return epuc("no clear code", "Corrupt GIF"); + + if (oldcode >= 0) { + p = &g->codes[avail++]; + if (avail > 4096) return epuc("too many codes", "Corrupt GIF"); + p->prefix = (int16) oldcode; + p->first = g->codes[oldcode].first; + p->suffix = (code == avail) ? p->first : g->codes[code].first; + } else if (code == avail) + return epuc("illegal code in raster", "Corrupt GIF"); + + stbi_out_gif_code(g, (uint16) code); + + if ((avail & codemask) == 0 && avail <= 0x0FFF) { + codesize++; + codemask = (1 << codesize) - 1; + } + + oldcode = code; + } else { + return epuc("illegal code in raster", "Corrupt GIF"); + } + } + } +} + +static void stbi_fill_gif_background(stbi_gif *g) +{ + int i; + uint8 *c = g->pal[g->bgindex]; + // @OPTIMIZE: write a dword at a time + for (i = 0; i < g->w * g->h * 4; i += 4) { + uint8 *p = &g->out[i]; + p[0] = c[2]; + p[1] = c[1]; + p[2] = c[0]; + p[3] = c[3]; + } +} + +// this function is designed to support animated gifs, although stb_image doesn't support it +static uint8 *stbi_gif_load_next(stbi *s, stbi_gif *g, int *comp, int req_comp) +{ + int i; + uint8 *old_out = 0; + + if (g->out == 0) { + if (!stbi_gif_header(s, g, comp,0)) return 0; // failure_reason set by stbi_gif_header + g->out = (uint8 *) malloc(4 * g->w * g->h); + if (g->out == 0) return epuc("outofmem", "Out of memory"); + stbi_fill_gif_background(g); + } else { + // animated-gif-only path + if (((g->eflags & 0x1C) >> 2) == 3) { + old_out = g->out; + g->out = (uint8 *) malloc(4 * g->w * g->h); + if (g->out == 0) return epuc("outofmem", "Out of memory"); + memcpy(g->out, old_out, g->w*g->h*4); + } + } + + for (;;) { + switch (get8(s)) { + case 0x2C: /* Image Descriptor */ + { + int32 x, y, w, h; + uint8 *o; + + x = get16le(s); + y = get16le(s); + w = get16le(s); + h = get16le(s); + if (((x + w) > (g->w)) || ((y + h) > (g->h))) + return epuc("bad Image Descriptor", "Corrupt GIF"); + + g->line_size = g->w * 4; + g->start_x = x * 4; + g->start_y = y * g->line_size; + g->max_x = g->start_x + w * 4; + g->max_y = g->start_y + h * g->line_size; + g->cur_x = g->start_x; + g->cur_y = g->start_y; + + g->lflags = get8(s); + + if (g->lflags & 0x40) { + g->step = 8 * g->line_size; // first interlaced spacing + g->parse = 3; + } else { + g->step = g->line_size; + g->parse = 0; + } + + if (g->lflags & 0x80) { + stbi_gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1); + g->color_table = (uint8 *) g->lpal; + } else if (g->flags & 0x80) { + for (i=0; i < 256; ++i) // @OPTIMIZE: reset only the previous transparent + g->pal[i][3] = 255; + if (g->transparent >= 0 && (g->eflags & 0x01)) + g->pal[g->transparent][3] = 0; + g->color_table = (uint8 *) g->pal; + } else + return epuc("missing color table", "Corrupt GIF"); + + o = stbi_process_gif_raster(s, g); + if (o == NULL) return NULL; + + if (req_comp && req_comp != 4) + o = convert_format(o, 4, req_comp, g->w, g->h); + return o; + } + + case 0x21: // Comment Extension. + { + int len; + if (get8(s) == 0xF9) { // Graphic Control Extension. + len = get8(s); + if (len == 4) { + g->eflags = get8(s); + get16le(s); // delay + g->transparent = get8(s); + } else { + skip(s, len); + break; + } + } + while ((len = get8(s)) != 0) + skip(s, len); + break; + } + + case 0x3B: // gif stream termination code + return (uint8 *) 1; + + default: + return epuc("unknown code", "Corrupt GIF"); + } + } +} + +static stbi_uc *stbi_gif_load(stbi *s, int *x, int *y, int *comp, int req_comp) +{ + uint8 *u = 0; + stbi_gif g={0}; + + u = stbi_gif_load_next(s, &g, comp, req_comp); + if (u == (void *) 1) u = 0; // end of animated gif marker + if (u) { + *x = g.w; + *y = g.h; + } + + return u; +} + +static int stbi_gif_info(stbi *s, int *x, int *y, int *comp) +{ + return stbi_gif_info_raw(s,x,y,comp); +} + + +// ************************************************************************************************* +// Radiance RGBE HDR loader +// originally by Nicolas Schulz +#ifndef STBI_NO_HDR +static int hdr_test(stbi *s) +{ + const char *signature = "#?RADIANCE\n"; + int i; + for (i=0; signature[i]; ++i) + if (get8(s) != signature[i]) + return 0; + return 1; +} + +static int stbi_hdr_test(stbi* s) +{ + int r = hdr_test(s); + stbi_rewind(s); + return r; +} + +#define HDR_BUFLEN 1024 +static char *hdr_gettoken(stbi *z, char *buffer) +{ + int len=0; + char c = '\0'; + + c = (char) 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 = (char) 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 + for(;;) { + 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) + uint8 rgbe[4]; + rgbe[0] = (uint8) c1; + rgbe[1] = (uint8) c2; + rgbe[2] = (uint8) len; + rgbe[3] = (uint8) get8u(s); + hdr_convert(hdr_data, rgbe, req_comp); + i = 1; + j = 0; + free(scanline); + goto main_decode_loop; // yes, this makes no sense + } + 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 = get8u(s); + if (count > 128) { + // Run + value = get8u(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] = get8u(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 float *stbi_hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp) +{ + return hdr_load(s,x,y,comp,req_comp); +} + +static int stbi_hdr_info(stbi *s, int *x, int *y, int *comp) +{ + char buffer[HDR_BUFLEN]; + char *token; + int valid = 0; + + if (strcmp(hdr_gettoken(s,buffer), "#?RADIANCE") != 0) { + stbi_rewind( s ); + return 0; + } + + for(;;) { + token = hdr_gettoken(s,buffer); + if (token[0] == 0) break; + if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; + } + + if (!valid) { + stbi_rewind( s ); + return 0; + } + token = hdr_gettoken(s,buffer); + if (strncmp(token, "-Y ", 3)) { + stbi_rewind( s ); + return 0; + } + token += 3; + *y = strtol(token, &token, 10); + while (*token == ' ') ++token; + if (strncmp(token, "+X ", 3)) { + stbi_rewind( s ); + return 0; + } + token += 3; + *x = strtol(token, NULL, 10); + *comp = 3; + return 1; +} +#endif // STBI_NO_HDR + +static int stbi_bmp_info(stbi *s, int *x, int *y, int *comp) +{ + int hsz; + if (get8(s) != 'B' || get8(s) != 'M') { + stbi_rewind( s ); + return 0; + } + skip(s,12); + hsz = get32le(s); + if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) { + stbi_rewind( s ); + return 0; + } + if (hsz == 12) { + *x = get16le(s); + *y = get16le(s); + } else { + *x = get32le(s); + *y = get32le(s); + } + if (get16le(s) != 1) { + stbi_rewind( s ); + return 0; + } + *comp = get16le(s) / 8; + return 1; +} + +static int stbi_psd_info(stbi *s, int *x, int *y, int *comp) +{ + int channelCount; + if (get32(s) != 0x38425053) { + stbi_rewind( s ); + return 0; + } + if (get16(s) != 1) { + stbi_rewind( s ); + return 0; + } + skip(s, 6); + channelCount = get16(s); + if (channelCount < 0 || channelCount > 16) { + stbi_rewind( s ); + return 0; + } + *y = get32(s); + *x = get32(s); + if (get16(s) != 8) { + stbi_rewind( s ); + return 0; + } + if (get16(s) != 3) { + stbi_rewind( s ); + return 0; + } + *comp = 4; + return 1; +} + +static int stbi_pic_info(stbi *s, int *x, int *y, int *comp) +{ + int act_comp=0,num_packets=0,chained; + pic_packet_t packets[10]; + + skip(s, 92); + + *x = get16(s); + *y = get16(s); + if (at_eof(s)) return 0; + if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) { + stbi_rewind( s ); + return 0; + } + + skip(s, 8); + + do { + pic_packet_t *packet; + + if (num_packets==sizeof(packets)/sizeof(packets[0])) + return 0; + + packet = &packets[num_packets++]; + chained = get8(s); + packet->size = get8u(s); + packet->type = get8u(s); + packet->channel = get8u(s); + act_comp |= packet->channel; + + if (at_eof(s)) { + stbi_rewind( s ); + return 0; + } + if (packet->size != 8) { + stbi_rewind( s ); + return 0; + } + } while (chained); + + *comp = (act_comp & 0x10 ? 4 : 3); + + return 1; +} + +static int stbi_info_main(stbi *s, int *x, int *y, int *comp) +{ + if (stbi_jpeg_info(s, x, y, comp)) + return 1; + if (stbi_png_info(s, x, y, comp)) + return 1; + if (stbi_gif_info(s, x, y, comp)) + return 1; + if (stbi_bmp_info(s, x, y, comp)) + return 1; + if (stbi_psd_info(s, x, y, comp)) + return 1; + if (stbi_pic_info(s, x, y, comp)) + return 1; + #ifndef STBI_NO_HDR + if (stbi_hdr_info(s, x, y, comp)) + return 1; + #endif + // test tga last because it's a crappy test! + if (stbi_tga_info(s, x, y, comp)) + return 1; + return e("unknown image type", "Image not of any known type, or corrupt"); +} + +#ifndef STBI_NO_STDIO +int stbi_info(char const *filename, int *x, int *y, int *comp) +{ + FILE *f = fopen(filename, "rb"); + int result; + if (!f) return e("can't fopen", "Unable to open file"); + result = stbi_info_from_file(f, x, y, comp); + fclose(f); + return result; +} + +int stbi_info_from_file(FILE *f, int *x, int *y, int *comp) +{ + int r; + stbi s; + long pos = ftell(f); + start_file(&s, f); + r = stbi_info_main(&s,x,y,comp); + fseek(f,pos,SEEK_SET); + return r; +} +#endif // !STBI_NO_STDIO + +int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) +{ + stbi s; + start_mem(&s,buffer,len); + return stbi_info_main(&s,x,y,comp); +} + +int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp) +{ + stbi s; + start_callbacks(&s, (stbi_io_callbacks *) c, user); + return stbi_info_main(&s,x,y,comp); +} + +#endif // STBI_HEADER_FILE_ONLY + +/* + revision history: + 1.33 (2011-07-14) + make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements + 1.32 (2011-07-13) + support for "info" function for all supported filetypes (SpartanJ) + 1.31 (2011-06-20) + a few more leak fixes, bug in PNG handling (SpartanJ) + 1.30 (2011-06-11) + added ability to load files via callbacks to accomidate custom input streams (Ben Wenger) + removed deprecated format-specific test/load functions + removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway + error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha) + fix inefficiency in decoding 32-bit BMP (David Woo) + 1.29 (2010-08-16) + various warning fixes from Aurelien Pocheville + 1.28 (2010-08-01) + fix bug in GIF palette transparency (SpartanJ) + 1.27 (2010-08-01) + cast-to-uint8 to fix warnings + 1.26 (2010-07-24) + fix bug in file buffering for PNG reported by SpartanJ + 1.25 (2010-07-17) + refix trans_data warning (Won Chun) + 1.24 (2010-07-12) + perf improvements reading from files on platforms with lock-heavy fgetc() + minor perf improvements for jpeg + deprecated type-specific functions so we'll get feedback if they're needed + attempt to fix trans_data warning (Won Chun) + 1.23 fixed bug in iPhone support + 1.22 (2010-07-10) + removed image *writing* support + stbi_info support from Jetro Lauha + GIF support from Jean-Marc Lienher + iPhone PNG-extensions from James Brown + warning-fixes from Nicolas Schulz and Janez Zemva (i.e. Janez (U+017D)emva) + 1.21 fix use of 'uint8' in header (reported by jon blow) + 1.20 added support for Softimage PIC, by Tom Seddon + 1.19 bug in interlaced PNG corruption check (found by ryg) + 1.18 2008-08-02 + fix a threading bug (local mutable static) + 1.17 support interlaced PNG + 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 + 0.50 first released version +*/ diff --git a/src/stb_truetype.h b/src/stb_truetype.h new file mode 100644 index 0000000..3947a23 --- /dev/null +++ b/src/stb_truetype.h @@ -0,0 +1,2065 @@ +// 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 +#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 + #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 + #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 + #define STBTT_malloc(x,u) malloc(x) + #define STBTT_free(x,u) free(x) + #endif + + #ifndef STBTT_assert + #include + #define STBTT_assert(x) assert(x) + #endif + + #ifndef STBTT_strlen + #include + #define STBTT_strlen(x) strlen(x) + #endif + + #ifndef STBTT_memcpy + #include + #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