diff --git a/demo/nanovg/.gitignore b/demo/nanovg/.gitignore new file mode 100644 index 0000000..70f534e --- /dev/null +++ b/demo/nanovg/.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/demo/nanovg/LICENSE.txt b/demo/nanovg/LICENSE.txt new file mode 100644 index 0000000..2a03a1a --- /dev/null +++ b/demo/nanovg/LICENSE.txt @@ -0,0 +1,18 @@ +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. + diff --git a/demo/nanovg/README.md b/demo/nanovg/README.md new file mode 100644 index 0000000..764344e --- /dev/null +++ b/demo/nanovg/README.md @@ -0,0 +1,118 @@ +/work in progress.../ + + +NanoVG +========== + +NanoVG is small antialiased vector graphics rendering library for OpenGL. It has lean API modeled after HTML5 canvas API. It is aimed to be a practical and fun toolset for building scalable user interfaces and visualizations. + +## Screenshot + +![screenshot of some text rendered witht the sample program](/example/screenshot-01.png?raw=true) + +Usage +===== + +The NanoVG API is modeled loosely on HTML5 canvas API. If you know canvas, you're up to speed with NanoVG in no time. + +## Creating drawing context + +The drawing context is created using platform specific constructor function. If you're using the OpenGL 2.0 back-end the context is created as follows: +```C +#define NANOVG_GL2_IMPLEMENTATION // Use GL2 implementation. +#include "nanovg_gl.h" +... +struct NVGcontext* vg = nvgCreateGL2(NVG_ANTIALIAS | NVG_STENCIL_STROKES); +``` + +The first parameter defines flags for creating the renderer. + +- `NVG_ANTIALIAS` means that the renderer adjusts the geometry to include anti-aliasing. If you're using MSAA, you can omit this flags. +- `NVG_STENCIL_STROKES` means that the render uses better quality rendering for (overlapping) strokes. The quality is mostly visible on wider strokes. If you want speed, you can omit this flag. + +Currently there is an OpenGL back-end for NanoVG: [nanovg_gl.h](/src/nanovg_gl.h) for OpenGL 2.0, OpenGL ES 2.0, OpenGL 3.2 core profile and OpenGL ES 3. The implementation can be chosen using a define as in above example. See the header file and examples for further info. + +## Drawing shapes with NanoVG + +Drawing a simple shape using NanoVG consists of four steps: 1) begin a new shape, 2) define the path to draw, 3) set fill or stroke, 4) and finally fill or stroke the path. + +```C +nvgBeginPath(vg); +nvgRect(vg, 100,100, 120,30); +nvgFillColor(vg, nvgRGBA(255,192,0,255)); +nvgFill(vg); +``` + +Calling `nvgBeginPath()` will clear any existing paths and start drawing from blank slate. There are number of number of functions to define the path to draw, such as rectangle, rounded rectangle and ellipse, or you can use the common moveTo, lineTo, bezierTo and arcTo API to compose the paths step by step. + +## Understanding Composite Paths + +Because of the way the rendering backend is build in NanoVG, drawing a composite path, that is path consisting from multiple paths defining holes and fills, is a bit more involved. NanoVG uses even-odd filling rule and by default the paths are wound in counter clockwise order. Keep that in mind when drawing using the low level draw API. In order to wind one of the predefined shapes as a hole, you should call `nvgPathWinding(vg, NVG_HOLE)`, or `nvgPathWinding(vg, NVG_CW)` _after_ defining the path. + +``` C +nvgBeginPath(vg); +nvgRect(vg, 100,100, 120,30); +nvgCircle(vg, 120,120, 5); +nvgPathWinding(vg, NVG_HOLE); // Mark circle as a hole. +nvgFillColor(vg, nvgRGBA(255,192,0,255)); +nvgFill(vg); +``` + +## Rendering is wrong, what to do? + +- make sure you have created NanoVG context using one of the `nvgCreatexxx()` calls +- make sure you have initialised OpenGL with stencil buffer +- make sure you have cleared stencil buffer +- make sure all rendering calls happen between `nvgBeginFrame()` and `nvgEndFrame()` +- to enable more checks for OpenGL errors, add `NVG_DEBUG` flag to `nvgCreatexxx()` +- if the problem still persists, please report an issue! + +## OpenGL state touched by the backend + +The OpenGL back-end touches following states: + +When textures are uploaded or updated, the following pixel store is set to defaults: `GL_UNPACK_ALIGNMENT`, `GL_UNPACK_ROW_LENGTH`, `GL_UNPACK_SKIP_PIXELS`, `GL_UNPACK_SKIP_ROWS`. Texture binding is also affected. Texture updates can happen when the user loads images, or when new font glyphs are added. Glyphs are added as needed between calls to `nvgBeginFrame()` and `nvgEndFrame()`. + +The data for the whole frame is buffered and flushed in `nvgEndFrame()`. The following code illustrates the OpenGL state touched by the rendering code: +```C + glUseProgram(prog); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glEnable(GL_CULL_FACE); + glCullFace(GL_BACK); + glFrontFace(GL_CCW); + glEnable(GL_BLEND); + glDisable(GL_DEPTH_TEST); + glDisable(GL_SCISSOR_TEST); + glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); + glStencilMask(0xffffffff); + glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); + glStencilFunc(GL_ALWAYS, 0, 0xffffffff); + glActiveTexture(GL_TEXTURE0); + glBindBuffer(GL_UNIFORM_BUFFER, buf); + glBindVertexArray(arr); + glBindBuffer(GL_ARRAY_BUFFER, buf); + glBindTexture(GL_TEXTURE_2D, tex); +``` + +## API Reference + +See the header file [nanovg.h](/src/nanovg.h) for API reference. + +## Ports + +- [DX11 port](https://github.com/cmaughan/nanovg) by [Chris Maughan](https://github.com/cmaughan) +- [bgfx port](https://github.com/bkaradzic/bgfx/tree/master/examples/20-nanovg) by [Branimir Karadžić](https://github.com/bkaradzic) + +## Projects using NanoVG + +- [Processing API simulation by vinjn](https://github.com/vinjn/island/blob/master/examples/01-processing/sketch2d.h) + +## License +The library is licensed under [zlib license](LICENSE.txt) + +## Discussions +[NanoVG mailing list](https://groups.google.com/forum/#!forum/nanovg) + +## Links +Uses [stb_truetype](http://nothings.org) (or, optionally, [freetype](http://freetype.org)) for font rendering. +Uses [stb_image](http://nothings.org) for image loading. diff --git a/demo/nanovg/nanovg.c b/demo/nanovg/nanovg.c new file mode 100644 index 0000000..44cf25f --- /dev/null +++ b/demo/nanovg/nanovg.c @@ -0,0 +1,2752 @@ +// +// 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 STB_IMAGE_IMPLEMENTATION +#include "stb_image.h" + +#ifdef _MSC_VER +#pragma warning(disable: 4100) // unreferenced formal parameter +#pragma warning(disable: 4127) // conditional expression is constant +#pragma warning(disable: 4204) // nonstandard extension used : non-constant aggregate initializer +#pragma warning(disable: 4706) // assignment within conditional expression +#endif + +#define NVG_INIT_FONTIMAGE_SIZE 512 +#define NVG_MAX_FONTIMAGE_SIZE 2048 +#define NVG_MAX_FONTIMAGES 4 + +#define NVG_INIT_COMMANDS_SIZE 256 +#define NVG_INIT_POINTS_SIZE 128 +#define NVG_INIT_PATHS_SIZE 16 +#define NVG_INIT_VERTS_SIZE 256 +#define NVG_MAX_STATES 32 + +#define NVG_KAPPA90 0.5522847493f // Length 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_PT_CORNER = 0x01, + NVG_PT_LEFT = 0x02, + NVG_PT_BEVEL = 0x04, + NVG_PR_INNERBEVEL = 0x08, +}; + +struct NVGstate { + NVGpaint fill; + NVGpaint stroke; + float strokeWidth; + float miterLimit; + int lineJoin; + int lineCap; + float alpha; + float xform[6]; + NVGscissor scissor; + float fontSize; + float letterSpacing; + float lineHeight; + float fontBlur; + int textAlign; + int fontId; +}; +typedef struct NVGstate NVGstate; + +struct NVGpoint { + float x,y; + float dx, dy; + float len; + float dmx, dmy; + unsigned char flags; +}; +typedef struct NVGpoint NVGpoint; + +struct NVGpathCache { + NVGpoint* points; + int npoints; + int cpoints; + NVGpath* paths; + int npaths; + int cpaths; + NVGvertex* verts; + int nverts; + int cverts; + float bounds[4]; +}; +typedef struct NVGpathCache NVGpathCache; + +struct NVGcontext { + NVGparams params; + float* commands; + int ccommands; + int ncommands; + float commandx, commandy; + NVGstate states[NVG_MAX_STATES]; + int nstates; + NVGpathCache* cache; + float tessTol; + float distTol; + float fringeWidth; + float devicePxRatio; + struct FONScontext* fs; + int fontImages[NVG_MAX_FONTIMAGES]; + int fontImageIdx; + int drawCallCount; + int fillTriCount; + int strokeTriCount; + int textTriCount; +}; + +static float nvg__sqrtf(float a) { return sqrtf(a); } +static float nvg__modf(float a, float b) { return fmodf(a, b); } +static float nvg__sinf(float a) { return sinf(a); } +static float nvg__cosf(float a) { return cosf(a); } +static float nvg__tanf(float a) { return tanf(a); } +static float nvg__atan2f(float a,float b) { return atan2f(a, b); } +static float nvg__acosf(float a) { return acosf(a); } + +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 int nvg__clampi(int a, int mn, int mx) { return a < mn ? mn : (a > mx ? mx : a); } +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__signf(float a) { return a >= 0.0f ? 1.0f : -1.0f; } +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 = nvg__sqrtf((*x)*(*x) + (*y)*(*y)); + if (d > 1e-6f) { + float id = 1.0f / d; + *x *= id; + *y *= id; + } + return d; +} + + +static void nvg__deletePathCache(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 NVGpathCache* nvg__allocPathCache(void) +{ + NVGpathCache* c = (NVGpathCache*)malloc(sizeof(NVGpathCache)); + if (c == NULL) goto error; + memset(c, 0, sizeof(NVGpathCache)); + + c->points = (NVGpoint*)malloc(sizeof(NVGpoint)*NVG_INIT_POINTS_SIZE); + if (!c->points) goto error; + c->npoints = 0; + c->cpoints = NVG_INIT_POINTS_SIZE; + + c->paths = (NVGpath*)malloc(sizeof(NVGpath)*NVG_INIT_PATHS_SIZE); + if (!c->paths) goto error; + c->npaths = 0; + c->cpaths = NVG_INIT_PATHS_SIZE; + + c->verts = (NVGvertex*)malloc(sizeof(NVGvertex)*NVG_INIT_VERTS_SIZE); + if (!c->verts) goto error; + c->nverts = 0; + c->cverts = NVG_INIT_VERTS_SIZE; + + return c; +error: + nvg__deletePathCache(c); + return NULL; +} + +static void nvg__setDevicePixelRatio(NVGcontext* ctx, float ratio) +{ + ctx->tessTol = 0.25f / ratio; + ctx->distTol = 0.01f / ratio; + ctx->fringeWidth = 1.0f / ratio; + ctx->devicePxRatio = ratio; +} + +NVGcontext* nvgCreateInternal(NVGparams* params) +{ + FONSparams fontParams; + NVGcontext* ctx = (NVGcontext*)malloc(sizeof(NVGcontext)); + int i; + if (ctx == NULL) goto error; + memset(ctx, 0, sizeof(NVGcontext)); + + ctx->params = *params; + for (i = 0; i < NVG_MAX_FONTIMAGES; i++) + ctx->fontImages[i] = 0; + + ctx->commands = (float*)malloc(sizeof(float)*NVG_INIT_COMMANDS_SIZE); + if (!ctx->commands) goto error; + ctx->ncommands = 0; + ctx->ccommands = NVG_INIT_COMMANDS_SIZE; + + ctx->cache = nvg__allocPathCache(); + if (ctx->cache == NULL) goto error; + + nvgSave(ctx); + nvgReset(ctx); + + nvg__setDevicePixelRatio(ctx, 1.0f); + + if (ctx->params.renderCreate(ctx->params.userPtr) == 0) goto error; + + // Init font rendering + memset(&fontParams, 0, sizeof(fontParams)); + fontParams.width = NVG_INIT_FONTIMAGE_SIZE; + fontParams.height = NVG_INIT_FONTIMAGE_SIZE; + fontParams.flags = FONS_ZERO_TOPLEFT; + fontParams.renderCreate = NULL; + fontParams.renderUpdate = NULL; + fontParams.renderDraw = NULL; + fontParams.renderDelete = NULL; + fontParams.userPtr = NULL; + ctx->fs = fonsCreateInternal(&fontParams); + if (ctx->fs == NULL) goto error; + + // Create font texture + ctx->fontImages[0] = ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_ALPHA, fontParams.width, fontParams.height, 0, NULL); + if (ctx->fontImages[0] == 0) goto error; + ctx->fontImageIdx = 0; + + return ctx; + +error: + nvgDeleteInternal(ctx); + return 0; +} + +NVGparams* nvgInternalParams(NVGcontext* ctx) +{ + return &ctx->params; +} + +void nvgDeleteInternal(NVGcontext* ctx) +{ + int i; + if (ctx == NULL) return; + if (ctx->commands != NULL) free(ctx->commands); + if (ctx->cache != NULL) nvg__deletePathCache(ctx->cache); + + if (ctx->fs) + fonsDeleteInternal(ctx->fs); + + for (i = 0; i < NVG_MAX_FONTIMAGES; i++) { + if (ctx->fontImages[i] != 0) { + nvgDeleteImage(ctx, ctx->fontImages[i]); + ctx->fontImages[i] = 0; + } + } + + if (ctx->params.renderDelete != NULL) + ctx->params.renderDelete(ctx->params.userPtr); + + free(ctx); +} + +void nvgBeginFrame(NVGcontext* ctx, int windowWidth, int windowHeight, float devicePixelRatio) +{ +/* 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->nstates = 0; + nvgSave(ctx); + nvgReset(ctx); + + nvg__setDevicePixelRatio(ctx, devicePixelRatio); + + ctx->params.renderViewport(ctx->params.userPtr, windowWidth, windowHeight); + + ctx->drawCallCount = 0; + ctx->fillTriCount = 0; + ctx->strokeTriCount = 0; + ctx->textTriCount = 0; +} + +void nvgCancelFrame(NVGcontext* ctx) +{ + ctx->params.renderCancel(ctx->params.userPtr); +} + +void nvgEndFrame(NVGcontext* ctx) +{ + ctx->params.renderFlush(ctx->params.userPtr); + if (ctx->fontImageIdx != 0) { + int fontImage = ctx->fontImages[ctx->fontImageIdx]; + int i, j, iw, ih; + // delete images that smaller than current one + if (fontImage == 0) + return; + nvgImageSize(ctx, fontImage, &iw, &ih); + for (i = j = 0; i < ctx->fontImageIdx; i++) { + if (ctx->fontImages[i] != 0) { + int nw, nh; + nvgImageSize(ctx, ctx->fontImages[i], &nw, &nh); + if (nw < iw || nh < ih) + nvgDeleteImage(ctx, ctx->fontImages[i]); + else + ctx->fontImages[j++] = ctx->fontImages[i]; + } + } + // make current font image to first + ctx->fontImages[j++] = ctx->fontImages[0]; + ctx->fontImages[0] = fontImage; + ctx->fontImageIdx = 0; + // clear all images after j + for (i = j; i < NVG_MAX_FONTIMAGES; i++) + ctx->fontImages[i] = 0; + } +} + +NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b) +{ + return nvgRGBA(r,g,b,255); +} + +NVGcolor nvgRGBf(float r, float g, float b) +{ + return nvgRGBAf(r,g,b,1.0f); +} + +NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a) +{ + NVGcolor color; + // Use longer initialization to suppress warning. + color.r = r / 255.0f; + color.g = g / 255.0f; + color.b = b / 255.0f; + color.a = a / 255.0f; + return color; +} + +NVGcolor nvgRGBAf(float r, float g, float b, float a) +{ + NVGcolor color; + // Use longer initialization to suppress warning. + color.r = r; + color.g = g; + color.b = b; + color.a = a; + return color; +} + +NVGcolor nvgTransRGBA(NVGcolor c, unsigned char a) +{ + c.a = a / 255.0f; + return c; +} + +NVGcolor nvgTransRGBAf(NVGcolor c, float a) +{ + c.a = a; + return c; +} + +NVGcolor nvgLerpRGBA(NVGcolor c0, NVGcolor c1, float u) +{ + int i; + float oneminu; + NVGcolor cint; + + u = nvg__clampf(u, 0.0f, 1.0f); + oneminu = 1.0f - u; + for( i = 0; i <4; i++ ) + { + cint.rgba[i] = c0.rgba[i] * oneminu + c1.rgba[i] * u; + } + + return cint; +} + +NVGcolor nvgHSL(float h, float s, float l) +{ + return nvgHSLA(h,s,l,255); +} + +static float nvg__hue(float h, float m1, float m2) +{ + if (h < 0) h += 1; + if (h > 1) h -= 1; + if (h < 1.0f/6.0f) + return m1 + (m2 - m1) * h * 6.0f; + else if (h < 3.0f/6.0f) + return m2; + else if (h < 4.0f/6.0f) + return m1 + (m2 - m1) * (2.0f/3.0f - h) * 6.0f; + return m1; +} + +NVGcolor nvgHSLA(float h, float s, float l, unsigned char a) +{ + float m1, m2; + NVGcolor col; + h = nvg__modf(h, 1.0f); + if (h < 0.0f) h += 1.0f; + s = nvg__clampf(s, 0.0f, 1.0f); + l = nvg__clampf(l, 0.0f, 1.0f); + m2 = l <= 0.5f ? (l * (1 + s)) : (l + s - l * s); + m1 = 2 * l - m2; + col.r = nvg__clampf(nvg__hue(h + 1.0f/3.0f, m1, m2), 0.0f, 1.0f); + col.g = nvg__clampf(nvg__hue(h, m1, m2), 0.0f, 1.0f); + col.b = nvg__clampf(nvg__hue(h - 1.0f/3.0f, m1, m2), 0.0f, 1.0f); + col.a = a/255.0f; + return col; +} + + +static NVGstate* nvg__getState(NVGcontext* ctx) +{ + return &ctx->states[ctx->nstates-1]; +} + +void nvgTransformIdentity(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; +} + +void nvgTransformTranslate(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; +} + +void nvgTransformScale(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; +} + +void nvgTransformRotate(float* t, float a) +{ + float cs = nvg__cosf(a), sn = nvg__sinf(a); + t[0] = cs; t[1] = sn; + t[2] = -sn; t[3] = cs; + t[4] = 0.0f; t[5] = 0.0f; +} + +void nvgTransformSkewX(float* t, float a) +{ + t[0] = 1.0f; t[1] = 0.0f; + t[2] = nvg__tanf(a); t[3] = 1.0f; + t[4] = 0.0f; t[5] = 0.0f; +} + +void nvgTransformSkewY(float* t, float a) +{ + t[0] = 1.0f; t[1] = nvg__tanf(a); + t[2] = 0.0f; t[3] = 1.0f; + t[4] = 0.0f; t[5] = 0.0f; +} + +void nvgTransformMultiply(float* t, const 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; +} + +void nvgTransformPremultiply(float* t, const float* s) +{ + float s2[6]; + memcpy(s2, s, sizeof(float)*6); + nvgTransformMultiply(s2, t); + memcpy(t, s2, sizeof(float)*6); +} + +int nvgTransformInverse(float* inv, const float* t) +{ + double invdet, det = (double)t[0] * t[3] - (double)t[2] * t[1]; + if (det > -1e-6 && det < 1e-6) { + nvgTransformIdentity(inv); + return 0; + } + 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); + return 1; +} + +void nvgTransformPoint(float* dx, float* dy, const float* t, float sx, float sy) +{ + *dx = sx*t[0] + sy*t[2] + t[4]; + *dy = sx*t[1] + sy*t[3] + t[5]; +} + +float nvgDegToRad(float deg) +{ + return deg / 180.0f * NVG_PI; +} + +float nvgRadToDeg(float rad) +{ + return rad / NVG_PI * 180.0f; +} + +static void nvg__setPaintColor(NVGpaint* p, NVGcolor color) +{ + memset(p, 0, sizeof(*p)); + nvgTransformIdentity(p->xform); + p->radius = 0.0f; + p->feather = 1.0f; + p->innerColor = color; + p->outerColor = color; +} + + +// State handling +void nvgSave(NVGcontext* ctx) +{ + if (ctx->nstates >= NVG_MAX_STATES) + return; + if (ctx->nstates > 0) + memcpy(&ctx->states[ctx->nstates], &ctx->states[ctx->nstates-1], sizeof(NVGstate)); + ctx->nstates++; +} + +void nvgRestore(NVGcontext* ctx) +{ + if (ctx->nstates <= 1) + return; + ctx->nstates--; +} + +void nvgReset(NVGcontext* ctx) +{ + 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 = 10.0f; + state->lineCap = NVG_BUTT; + state->lineJoin = NVG_MITER; + state->alpha = 1.0f; + nvgTransformIdentity(state->xform); + + state->scissor.extent[0] = -1.0f; + state->scissor.extent[1] = -1.0f; + + state->fontSize = 16.0f; + state->letterSpacing = 0.0f; + state->lineHeight = 1.0f; + state->fontBlur = 0.0f; + state->textAlign = NVG_ALIGN_LEFT | NVG_ALIGN_BASELINE; + state->fontId = 0; +} + +// State setting +void nvgStrokeWidth(NVGcontext* ctx, float width) +{ + NVGstate* state = nvg__getState(ctx); + state->strokeWidth = width; +} + +void nvgMiterLimit(NVGcontext* ctx, float limit) +{ + NVGstate* state = nvg__getState(ctx); + state->miterLimit = limit; +} + +void nvgLineCap(NVGcontext* ctx, int cap) +{ + NVGstate* state = nvg__getState(ctx); + state->lineCap = cap; +} + +void nvgLineJoin(NVGcontext* ctx, int join) +{ + NVGstate* state = nvg__getState(ctx); + state->lineJoin = join; +} + +void nvgGlobalAlpha(NVGcontext* ctx, float alpha) +{ + NVGstate* state = nvg__getState(ctx); + state->alpha = alpha; +} + +void nvgTransform(NVGcontext* ctx, float a, float b, float c, float d, float e, float f) +{ + NVGstate* state = nvg__getState(ctx); + float t[6] = { a, b, c, d, e, f }; + nvgTransformPremultiply(state->xform, t); +} + +void nvgResetTransform(NVGcontext* ctx) +{ + NVGstate* state = nvg__getState(ctx); + nvgTransformIdentity(state->xform); +} + +void nvgTranslate(NVGcontext* ctx, float x, float y) +{ + NVGstate* state = nvg__getState(ctx); + float t[6]; + nvgTransformTranslate(t, x,y); + nvgTransformPremultiply(state->xform, t); +} + +void nvgRotate(NVGcontext* ctx, float angle) +{ + NVGstate* state = nvg__getState(ctx); + float t[6]; + nvgTransformRotate(t, angle); + nvgTransformPremultiply(state->xform, t); +} + +void nvgSkewX(NVGcontext* ctx, float angle) +{ + NVGstate* state = nvg__getState(ctx); + float t[6]; + nvgTransformSkewX(t, angle); + nvgTransformPremultiply(state->xform, t); +} + +void nvgSkewY(NVGcontext* ctx, float angle) +{ + NVGstate* state = nvg__getState(ctx); + float t[6]; + nvgTransformSkewY(t, angle); + nvgTransformPremultiply(state->xform, t); +} + +void nvgScale(NVGcontext* ctx, float x, float y) +{ + NVGstate* state = nvg__getState(ctx); + float t[6]; + nvgTransformScale(t, x,y); + nvgTransformPremultiply(state->xform, t); +} + +void nvgCurrentTransform(NVGcontext* ctx, float* xform) +{ + NVGstate* state = nvg__getState(ctx); + if (xform == NULL) return; + memcpy(xform, state->xform, sizeof(float)*6); +} + +void nvgStrokeColor(NVGcontext* ctx, NVGcolor color) +{ + NVGstate* state = nvg__getState(ctx); + nvg__setPaintColor(&state->stroke, color); +} + +void nvgStrokePaint(NVGcontext* ctx, NVGpaint paint) +{ + NVGstate* state = nvg__getState(ctx); + state->stroke = paint; + nvgTransformMultiply(state->stroke.xform, state->xform); +} + +void nvgFillColor(NVGcontext* ctx, NVGcolor color) +{ + NVGstate* state = nvg__getState(ctx); + nvg__setPaintColor(&state->fill, color); +} + +void nvgFillPaint(NVGcontext* ctx, NVGpaint paint) +{ + NVGstate* state = nvg__getState(ctx); + state->fill = paint; + nvgTransformMultiply(state->fill.xform, state->xform); +} + +int nvgCreateImage(NVGcontext* ctx, const char* filename, int imageFlags) +{ + int w, h, n, image; + unsigned char* img; + stbi_set_unpremultiply_on_load(1); + stbi_convert_iphone_png_to_rgb(1); + 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, imageFlags, img); + stbi_image_free(img); + return image; +} + +int nvgCreateImageMem(NVGcontext* ctx, int imageFlags, unsigned char* data, int ndata) +{ + 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, imageFlags, img); + stbi_image_free(img); + return image; +} + +int nvgCreateImageRGBA(NVGcontext* ctx, int w, int h, int imageFlags, const unsigned char* data) +{ + return ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_RGBA, w, h, imageFlags, data); +} + +void nvgUpdateImage(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(NVGcontext* ctx, int image, int* w, int* h) +{ + ctx->params.renderGetTextureSize(ctx->params.userPtr, image, w, h); +} + +void nvgDeleteImage(NVGcontext* ctx, int image) +{ + ctx->params.renderDeleteTexture(ctx->params.userPtr, image); +} + +NVGpaint nvgLinearGradient(NVGcontext* ctx, + float sx, float sy, float ex, float ey, + NVGcolor icol, NVGcolor ocol) +{ + NVGpaint p; + float dx, dy, d; + const float large = 1e5; + NVG_NOTUSED(ctx); + 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; +} + +NVGpaint nvgRadialGradient(NVGcontext* ctx, + float cx, float cy, float inr, float outr, + NVGcolor icol, NVGcolor ocol) +{ + NVGpaint p; + float r = (inr+outr)*0.5f; + float f = (outr-inr); + NVG_NOTUSED(ctx); + memset(&p, 0, sizeof(p)); + + nvgTransformIdentity(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; +} + +NVGpaint nvgBoxGradient(NVGcontext* ctx, + float x, float y, float w, float h, float r, float f, + NVGcolor icol, NVGcolor ocol) +{ + NVGpaint p; + NVG_NOTUSED(ctx); + memset(&p, 0, sizeof(p)); + + nvgTransformIdentity(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; +} + + +NVGpaint nvgImagePattern(NVGcontext* ctx, + float cx, float cy, float w, float h, float angle, + int image, float alpha) +{ + NVGpaint p; + NVG_NOTUSED(ctx); + memset(&p, 0, sizeof(p)); + + nvgTransformRotate(p.xform, angle); + p.xform[4] = cx; + p.xform[5] = cy; + + p.extent[0] = w; + p.extent[1] = h; + + p.image = image; + + p.innerColor = p.outerColor = nvgRGBAf(1,1,1,alpha); + + return p; +} + +// Scissoring +void nvgScissor(NVGcontext* ctx, float x, float y, float w, float h) +{ + NVGstate* state = nvg__getState(ctx); + + w = nvg__maxf(0.0f, w); + h = nvg__maxf(0.0f, h); + + nvgTransformIdentity(state->scissor.xform); + state->scissor.xform[4] = x+w*0.5f; + state->scissor.xform[5] = y+h*0.5f; + nvgTransformMultiply(state->scissor.xform, state->xform); + + state->scissor.extent[0] = w*0.5f; + state->scissor.extent[1] = h*0.5f; +} + +static void nvg__isectRects(float* dst, + float ax, float ay, float aw, float ah, + float bx, float by, float bw, float bh) +{ + float minx = nvg__maxf(ax, bx); + float miny = nvg__maxf(ay, by); + float maxx = nvg__minf(ax+aw, bx+bw); + float maxy = nvg__minf(ay+ah, by+bh); + dst[0] = minx; + dst[1] = miny; + dst[2] = nvg__maxf(0.0f, maxx - minx); + dst[3] = nvg__maxf(0.0f, maxy - miny); +} + +void nvgIntersectScissor(NVGcontext* ctx, float x, float y, float w, float h) +{ + NVGstate* state = nvg__getState(ctx); + float pxform[6], invxorm[6]; + float rect[4]; + float ex, ey, tex, tey; + + // If no previous scissor has been set, set the scissor as current scissor. + if (state->scissor.extent[0] < 0) { + nvgScissor(ctx, x, y, w, h); + return; + } + + // Transform the current scissor rect into current transform space. + // If there is difference in rotation, this will be approximation. + memcpy(pxform, state->scissor.xform, sizeof(float)*6); + ex = state->scissor.extent[0]; + ey = state->scissor.extent[1]; + nvgTransformInverse(invxorm, state->xform); + nvgTransformMultiply(pxform, invxorm); + tex = ex*nvg__absf(pxform[0]) + ey*nvg__absf(pxform[2]); + tey = ex*nvg__absf(pxform[1]) + ey*nvg__absf(pxform[3]); + + // Intersect rects. + nvg__isectRects(rect, pxform[4]-tex,pxform[5]-tey,tex*2,tey*2, x,y,w,h); + + nvgScissor(ctx, rect[0], rect[1], rect[2], rect[3]); +} + +void nvgResetScissor(NVGcontext* ctx) +{ + NVGstate* state = nvg__getState(ctx); + memset(state->scissor.xform, 0, sizeof(state->scissor.xform)); + state->scissor.extent[0] = -1.0f; + state->scissor.extent[1] = -1.0f; +} + +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(NVGcontext* ctx, float* vals, int nvals) +{ + NVGstate* state = nvg__getState(ctx); + int i; + + if (ctx->ncommands+nvals > ctx->ccommands) { + float* commands; + int ccommands = ctx->ncommands+nvals + ctx->ccommands/2; + commands = (float*)realloc(ctx->commands, sizeof(float)*ccommands); + if (commands == NULL) return; + ctx->commands = commands; + ctx->ccommands = ccommands; + } + + if ((int)vals[0] != NVG_CLOSE && (int)vals[0] != NVG_WINDING) { + ctx->commandx = vals[nvals-2]; + ctx->commandy = vals[nvals-1]; + } + + // transform commands + i = 0; + while (i < nvals) { + int cmd = (int)vals[i]; + switch (cmd) { + case NVG_MOVETO: + nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]); + i += 3; + break; + case NVG_LINETO: + nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]); + i += 3; + break; + case NVG_BEZIERTO: + nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]); + nvgTransformPoint(&vals[i+3],&vals[i+4], state->xform, vals[i+3],vals[i+4]); + nvgTransformPoint(&vals[i+5],&vals[i+6], state->xform, vals[i+5],vals[i+6]); + 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; +} + + +static void nvg__clearPathCache(NVGcontext* ctx) +{ + ctx->cache->npoints = 0; + ctx->cache->npaths = 0; +} + +static NVGpath* nvg__lastPath(NVGcontext* ctx) +{ + if (ctx->cache->npaths > 0) + return &ctx->cache->paths[ctx->cache->npaths-1]; + return NULL; +} + +static void nvg__addPath(NVGcontext* ctx) +{ + NVGpath* path; + if (ctx->cache->npaths+1 > ctx->cache->cpaths) { + NVGpath* paths; + int cpaths = ctx->cache->npaths+1 + ctx->cache->cpaths/2; + paths = (NVGpath*)realloc(ctx->cache->paths, sizeof(NVGpath)*cpaths); + if (paths == NULL) return; + ctx->cache->paths = paths; + ctx->cache->cpaths = cpaths; + } + 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 NVGpoint* nvg__lastPoint(NVGcontext* ctx) +{ + if (ctx->cache->npoints > 0) + return &ctx->cache->points[ctx->cache->npoints-1]; + return NULL; +} + +static void nvg__addPoint(NVGcontext* ctx, float x, float y, int flags) +{ + NVGpath* path = nvg__lastPath(ctx); + NVGpoint* pt; + if (path == NULL) return; + + if (path->count > 0 && ctx->cache->npoints > 0) { + pt = nvg__lastPoint(ctx); + if (nvg__ptEquals(pt->x,pt->y, x,y, ctx->distTol)) { + pt->flags |= flags; + return; + } + } + + if (ctx->cache->npoints+1 > ctx->cache->cpoints) { + NVGpoint* points; + int cpoints = ctx->cache->npoints+1 + ctx->cache->cpoints/2; + points = (NVGpoint*)realloc(ctx->cache->points, sizeof(NVGpoint)*cpoints); + if (points == NULL) return; + ctx->cache->points = points; + ctx->cache->cpoints = cpoints; + } + + pt = &ctx->cache->points[ctx->cache->npoints]; + memset(pt, 0, sizeof(*pt)); + pt->x = x; + pt->y = y; + pt->flags = (unsigned char)flags; + + ctx->cache->npoints++; + path->count++; +} + +static void nvg__closePath(NVGcontext* ctx) +{ + NVGpath* path = nvg__lastPath(ctx); + if (path == NULL) return; + path->closed = 1; +} + +static void nvg__pathWinding(NVGcontext* ctx, int winding) +{ + 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 NVGvertex* nvg__allocTempVerts(NVGcontext* ctx, int nverts) +{ + if (nverts > ctx->cache->cverts) { + NVGvertex* verts; + int cverts = (nverts + 0xff) & ~0xff; // Round up to prevent allocations when things change just slightly. + verts = (NVGvertex*)realloc(ctx->cache->verts, sizeof(NVGvertex)*cverts); + if (verts == NULL) return NULL; + ctx->cache->verts = verts; + ctx->cache->cverts = cverts; + } + + 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(NVGpoint* pts, int npts) +{ + int i; + float area = 0; + for (i = 2; i < npts; i++) { + NVGpoint* a = &pts[0]; + NVGpoint* b = &pts[i-1]; + 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(NVGpoint* pts, int npts) +{ + 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(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(NVGcontext* ctx, + float x1, float y1, float x2, float y2, + float x3, float y3, float x4, float y4, + int level, int type) +{ + float x12,y12,x23,y23,x34,y34,x123,y123,x234,y234,x1234,y1234; + float dx,dy,d2,d3; + + if (level > 10) 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; + + dx = x4 - x1; + dy = y4 - y1; + d2 = nvg__absf(((x2 - x4) * dy - (y2 - y4) * dx)); + d3 = nvg__absf(((x3 - x4) * dy - (y3 - y4) * dx)); + + if ((d2 + d3)*(d2 + d3) < ctx->tessTol * (dx*dx + dy*dy)) { + nvg__addPoint(ctx, x4, y4, type); + 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, type); + return; + }*/ + + 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, 0); + nvg__tesselateBezier(ctx, x1234,y1234, x234,y234, x34,y34, x4,y4, level+1, type); +} + +static void nvg__flattenPaths(NVGcontext* ctx) +{ + NVGpathCache* cache = ctx->cache; +// NVGstate* state = nvg__getState(ctx); + NVGpoint* last; + NVGpoint* p0; + NVGpoint* p1; + NVGpoint* pts; + 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], NVG_PT_CORNER); + i += 3; + break; + case NVG_LINETO: + p = &ctx->commands[i+1]; + nvg__addPoint(ctx, p[0], p[1], NVG_PT_CORNER); + 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, NVG_PT_CORNER); + } + 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++; + } + } +} + +static int nvg__curveDivs(float r, float arc, float tol) +{ + float da = acosf(r / (r + tol)) * 2.0f; + return nvg__maxi(2, (int)ceilf(arc / da)); +} + +static void nvg__chooseBevel(int bevel, NVGpoint* p0, NVGpoint* p1, float w, + float* x0, float* y0, float* x1, float* y1) +{ + if (bevel) { + *x0 = p1->x + p0->dy * w; + *y0 = p1->y - p0->dx * w; + *x1 = p1->x + p1->dy * w; + *y1 = p1->y - p1->dx * w; + } else { + *x0 = p1->x + p1->dmx * w; + *y0 = p1->y + p1->dmy * w; + *x1 = p1->x + p1->dmx * w; + *y1 = p1->y + p1->dmy * w; + } +} + +static NVGvertex* nvg__roundJoin(NVGvertex* dst, NVGpoint* p0, NVGpoint* p1, + float lw, float rw, float lu, float ru, int ncap, float fringe) +{ + int i, n; + float dlx0 = p0->dy; + float dly0 = -p0->dx; + float dlx1 = p1->dy; + float dly1 = -p1->dx; + NVG_NOTUSED(fringe); + + if (p1->flags & NVG_PT_LEFT) { + float lx0,ly0,lx1,ly1,a0,a1; + nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, lw, &lx0,&ly0, &lx1,&ly1); + a0 = atan2f(-dly0, -dlx0); + a1 = atan2f(-dly1, -dlx1); + if (a1 > a0) a1 -= NVG_PI*2; + + nvg__vset(dst, lx0, ly0, lu,1); dst++; + nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++; + + n = nvg__clampi((int)ceilf(((a0 - a1) / NVG_PI) * ncap), 2, ncap); + for (i = 0; i < n; i++) { + float u = i/(float)(n-1); + float a = a0 + u*(a1-a0); + float rx = p1->x + cosf(a) * rw; + float ry = p1->y + sinf(a) * rw; + nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; + nvg__vset(dst, rx, ry, ru,1); dst++; + } + + nvg__vset(dst, lx1, ly1, lu,1); dst++; + nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++; + + } else { + float rx0,ry0,rx1,ry1,a0,a1; + nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, -rw, &rx0,&ry0, &rx1,&ry1); + a0 = atan2f(dly0, dlx0); + a1 = atan2f(dly1, dlx1); + if (a1 < a0) a1 += NVG_PI*2; + + nvg__vset(dst, p1->x + dlx0*rw, p1->y + dly0*rw, lu,1); dst++; + nvg__vset(dst, rx0, ry0, ru,1); dst++; + + n = nvg__clampi((int)ceilf(((a1 - a0) / NVG_PI) * ncap), 2, ncap); + for (i = 0; i < n; i++) { + float u = i/(float)(n-1); + float a = a0 + u*(a1-a0); + float lx = p1->x + cosf(a) * lw; + float ly = p1->y + sinf(a) * lw; + nvg__vset(dst, lx, ly, lu,1); dst++; + nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; + } + + nvg__vset(dst, p1->x + dlx1*rw, p1->y + dly1*rw, lu,1); dst++; + nvg__vset(dst, rx1, ry1, ru,1); dst++; + + } + return dst; +} + +static NVGvertex* nvg__bevelJoin(NVGvertex* dst, NVGpoint* p0, NVGpoint* p1, + float lw, float rw, float lu, float ru, float fringe) +{ + float rx0,ry0,rx1,ry1; + float lx0,ly0,lx1,ly1; + float dlx0 = p0->dy; + float dly0 = -p0->dx; + float dlx1 = p1->dy; + float dly1 = -p1->dx; + NVG_NOTUSED(fringe); + + if (p1->flags & NVG_PT_LEFT) { + nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, lw, &lx0,&ly0, &lx1,&ly1); + + nvg__vset(dst, lx0, ly0, lu,1); dst++; + nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++; + + if (p1->flags & NVG_PT_BEVEL) { + nvg__vset(dst, lx0, ly0, lu,1); dst++; + nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++; + + nvg__vset(dst, lx1, ly1, lu,1); dst++; + nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++; + } else { + rx0 = p1->x - p1->dmx * rw; + ry0 = p1->y - p1->dmy * rw; + + nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; + nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++; + + nvg__vset(dst, rx0, ry0, ru,1); dst++; + nvg__vset(dst, rx0, ry0, ru,1); dst++; + + nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; + nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++; + } + + nvg__vset(dst, lx1, ly1, lu,1); dst++; + nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++; + + } else { + nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, -rw, &rx0,&ry0, &rx1,&ry1); + + nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++; + nvg__vset(dst, rx0, ry0, ru,1); dst++; + + if (p1->flags & NVG_PT_BEVEL) { + nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++; + nvg__vset(dst, rx0, ry0, ru,1); dst++; + + nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++; + nvg__vset(dst, rx1, ry1, ru,1); dst++; + } else { + lx0 = p1->x + p1->dmx * lw; + ly0 = p1->y + p1->dmy * lw; + + nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++; + nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; + + nvg__vset(dst, lx0, ly0, lu,1); dst++; + nvg__vset(dst, lx0, ly0, lu,1); dst++; + + nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++; + nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; + } + + nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++; + nvg__vset(dst, rx1, ry1, ru,1); dst++; + } + + return dst; +} + +static NVGvertex* nvg__buttCapStart(NVGvertex* dst, NVGpoint* p, + float dx, float dy, float w, float d, float aa) +{ + float px = p->x - dx*d; + float py = p->y - dy*d; + float dlx = dy; + float dly = -dx; + nvg__vset(dst, px + dlx*w - dx*aa, py + dly*w - dy*aa, 0,0); dst++; + nvg__vset(dst, px - dlx*w - dx*aa, py - dly*w - dy*aa, 1,0); dst++; + nvg__vset(dst, px + dlx*w, py + dly*w, 0,1); dst++; + nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); dst++; + return dst; +} + +static NVGvertex* nvg__buttCapEnd(NVGvertex* dst, NVGpoint* p, + float dx, float dy, float w, float d, float aa) +{ + float px = p->x + dx*d; + float py = p->y + dy*d; + float dlx = dy; + float dly = -dx; + nvg__vset(dst, px + dlx*w, py + dly*w, 0,1); dst++; + nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); dst++; + nvg__vset(dst, px + dlx*w + dx*aa, py + dly*w + dy*aa, 0,0); dst++; + nvg__vset(dst, px - dlx*w + dx*aa, py - dly*w + dy*aa, 1,0); dst++; + return dst; +} + + +static NVGvertex* nvg__roundCapStart(NVGvertex* dst, NVGpoint* p, + float dx, float dy, float w, int ncap, float aa) +{ + int i; + float px = p->x; + float py = p->y; + float dlx = dy; + float dly = -dx; + NVG_NOTUSED(aa); + for (i = 0; i < ncap; i++) { + float a = i/(float)(ncap-1)*NVG_PI; + float ax = cosf(a) * w, ay = sinf(a) * w; + nvg__vset(dst, px - dlx*ax - dx*ay, py - dly*ax - dy*ay, 0,1); dst++; + nvg__vset(dst, px, py, 0.5f,1); dst++; + } + nvg__vset(dst, px + dlx*w, py + dly*w, 0,1); dst++; + nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); dst++; + return dst; +} + +static NVGvertex* nvg__roundCapEnd(NVGvertex* dst, NVGpoint* p, + float dx, float dy, float w, int ncap, float aa) +{ + int i; + float px = p->x; + float py = p->y; + float dlx = dy; + float dly = -dx; + NVG_NOTUSED(aa); + nvg__vset(dst, px + dlx*w, py + dly*w, 0,1); dst++; + nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); dst++; + for (i = 0; i < ncap; i++) { + float a = i/(float)(ncap-1)*NVG_PI; + float ax = cosf(a) * w, ay = sinf(a) * w; + nvg__vset(dst, px, py, 0.5f,1); dst++; + nvg__vset(dst, px - dlx*ax + dx*ay, py - dly*ax + dy*ay, 0,1); dst++; + } + return dst; +} + + +static void nvg__calculateJoins(NVGcontext* ctx, float w, int lineJoin, float miterLimit) +{ + NVGpathCache* cache = ctx->cache; + int i, j; + float iw = 0.0f; + + if (w > 0.0f) iw = 1.0f / w; + + // Calculate which joins needs extra vertices to append, and gather vertex count. + for (i = 0; i < cache->npaths; i++) { + NVGpath* path = &cache->paths[i]; + NVGpoint* pts = &cache->points[path->first]; + NVGpoint* p0 = &pts[path->count-1]; + NVGpoint* p1 = &pts[0]; + int nleft = 0; + + path->nbevel = 0; + + for (j = 0; j < path->count; j++) { + float dlx0, dly0, dlx1, dly1, dmr2, cross, limit; + 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) { + float scale = 1.0f / dmr2; + if (scale > 600.0f) { + scale = 600.0f; + } + p1->dmx *= scale; + p1->dmy *= scale; + } + + // Clear flags, but keep the corner. + p1->flags = (p1->flags & NVG_PT_CORNER) ? NVG_PT_CORNER : 0; + + // Keep track of left turns. + cross = p1->dx * p0->dy - p0->dx * p1->dy; + if (cross > 0.0f) { + nleft++; + p1->flags |= NVG_PT_LEFT; + } + + // Calculate if we should use bevel or miter for inner join. + limit = nvg__maxf(1.01f, nvg__minf(p0->len, p1->len) * iw); + if ((dmr2 * limit*limit) < 1.0f) + p1->flags |= NVG_PR_INNERBEVEL; + + // Check to see if the corner needs to be beveled. + if (p1->flags & NVG_PT_CORNER) { + if ((dmr2 * miterLimit*miterLimit) < 1.0f || lineJoin == NVG_BEVEL || lineJoin == NVG_ROUND) { + p1->flags |= NVG_PT_BEVEL; + } + } + + if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0) + path->nbevel++; + + p0 = p1++; + } + + path->convex = (nleft == path->count) ? 1 : 0; + } +} + + +static int nvg__expandStroke(NVGcontext* ctx, float w, int lineCap, int lineJoin, float miterLimit) +{ + NVGpathCache* cache = ctx->cache; + NVGvertex* verts; + NVGvertex* dst; + int cverts, i, j; + float aa = ctx->fringeWidth; + int ncap = nvg__curveDivs(w, NVG_PI, ctx->tessTol); // Calculate divisions per half circle. + + nvg__calculateJoins(ctx, w, lineJoin, miterLimit); + + // Calculate max vertex usage. + cverts = 0; + for (i = 0; i < cache->npaths; i++) { + NVGpath* path = &cache->paths[i]; + int loop = (path->closed == 0) ? 0 : 1; + if (lineJoin == NVG_ROUND) + cverts += (path->count + path->nbevel*(ncap+2) + 1) * 2; // plus one for loop + else + cverts += (path->count + path->nbevel*5 + 1) * 2; // plus one for loop + if (loop == 0) { + // space for caps + if (lineCap == NVG_ROUND) { + cverts += (ncap*2 + 2)*2; + } else { + cverts += (3+3)*2; + } + } + } + + verts = nvg__allocTempVerts(ctx, cverts); + if (verts == NULL) return 0; + + for (i = 0; i < cache->npaths; i++) { + NVGpath* path = &cache->paths[i]; + NVGpoint* pts = &cache->points[path->first]; + NVGpoint* p0; + NVGpoint* p1; + int s, e, loop; + float dx, dy; + + path->fill = 0; + path->nfill = 0; + + // Calculate fringe or stroke + loop = (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 + dx = p1->x - p0->x; + dy = p1->y - p0->y; + nvg__normalize(&dx, &dy); + if (lineCap == NVG_BUTT) + dst = nvg__buttCapStart(dst, p0, dx, dy, w, -aa*0.5f, aa); + else if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE) + dst = nvg__buttCapStart(dst, p0, dx, dy, w, w-aa, aa); + else if (lineCap == NVG_ROUND) + dst = nvg__roundCapStart(dst, p0, dx, dy, w, ncap, aa); + } + + for (j = s; j < e; ++j) { + if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0) { + if (lineJoin == NVG_ROUND) { + dst = nvg__roundJoin(dst, p0, p1, w, w, 0, 1, ncap, aa); + } else { + dst = nvg__bevelJoin(dst, p0, p1, w, w, 0, 1, aa); + } + } else { + nvg__vset(dst, p1->x + (p1->dmx * w), p1->y + (p1->dmy * w), 0,1); dst++; + nvg__vset(dst, p1->x - (p1->dmx * w), p1->y - (p1->dmy * w), 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 + dx = p1->x - p0->x; + dy = p1->y - p0->y; + nvg__normalize(&dx, &dy); + if (lineCap == NVG_BUTT) + dst = nvg__buttCapEnd(dst, p1, dx, dy, w, -aa*0.5f, aa); + else if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE) + dst = nvg__buttCapEnd(dst, p1, dx, dy, w, w-aa, aa); + else if (lineCap == NVG_ROUND) + dst = nvg__roundCapEnd(dst, p1, dx, dy, w, ncap, aa); + } + + path->nstroke = (int)(dst - verts); + + verts = dst; + } + + return 1; +} + +static int nvg__expandFill(NVGcontext* ctx, float w, int lineJoin, float miterLimit) +{ + NVGpathCache* cache = ctx->cache; + NVGvertex* verts; + NVGvertex* dst; + int cverts, convex, i, j; + float aa = ctx->fringeWidth; + int fringe = w > 0.0f; + + nvg__calculateJoins(ctx, w, lineJoin, miterLimit); + + // Calculate max vertex usage. + cverts = 0; + for (i = 0; i < cache->npaths; i++) { + NVGpath* path = &cache->paths[i]; + cverts += path->count + path->nbevel + 1; + if (fringe) + cverts += (path->count + path->nbevel*5 + 1) * 2; // plus one for loop + } + + verts = nvg__allocTempVerts(ctx, cverts); + if (verts == NULL) return 0; + + convex = cache->npaths == 1 && cache->paths[0].convex; + + for (i = 0; i < cache->npaths; i++) { + NVGpath* path = &cache->paths[i]; + NVGpoint* pts = &cache->points[path->first]; + NVGpoint* p0; + NVGpoint* p1; + float rw, lw, woff; + float ru, lu; + + // Calculate shape vertices. + woff = 0.5f*aa; + dst = verts; + path->fill = dst; + + if (fringe) { + // Looping + p0 = &pts[path->count-1]; + p1 = &pts[0]; + for (j = 0; j < path->count; ++j) { + if (p1->flags & NVG_PT_BEVEL) { + float dlx0 = p0->dy; + float dly0 = -p0->dx; + float dlx1 = p1->dy; + float dly1 = -p1->dx; + if (p1->flags & NVG_PT_LEFT) { + float lx = p1->x + p1->dmx * woff; + float ly = p1->y + p1->dmy * woff; + nvg__vset(dst, lx, ly, 0.5f,1); dst++; + } else { + float lx0 = p1->x + dlx0 * woff; + float ly0 = p1->y + dly0 * woff; + float lx1 = p1->x + dlx1 * woff; + float ly1 = p1->y + dly1 * woff; + 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 * woff), p1->y + (p1->dmy * woff), 0.5f,1); dst++; + } + p0 = p1++; + } + } else { + for (j = 0; j < path->count; ++j) { + nvg__vset(dst, pts[j].x, pts[j].y, 0.5f,1); + dst++; + } + } + + path->nfill = (int)(dst - verts); + verts = dst; + + // Calculate fringe + if (fringe) { + lw = w + woff; + rw = w - woff; + lu = 0; + ru = 1; + dst = verts; + path->stroke = dst; + + // Create only half a fringe for convex shapes so that + // the shape can be rendered without stenciling. + if (convex) { + lw = woff; // This should generate the same vertex as fill inset above. + lu = 0.5f; // Set outline fade at middle. + } + + // Looping + p0 = &pts[path->count-1]; + p1 = &pts[0]; + + for (j = 0; j < path->count; ++j) { + if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0) { + dst = nvg__bevelJoin(dst, p0, p1, lw, rw, lu, ru, ctx->fringeWidth); + } else { + nvg__vset(dst, p1->x + (p1->dmx * lw), p1->y + (p1->dmy * lw), lu,1); dst++; + nvg__vset(dst, p1->x - (p1->dmx * rw), p1->y - (p1->dmy * rw), ru,1); dst++; + } + p0 = p1++; + } + + // Loop it + nvg__vset(dst, verts[0].x, verts[0].y, lu,1); dst++; + nvg__vset(dst, verts[1].x, verts[1].y, ru,1); dst++; + + path->nstroke = (int)(dst - verts); + verts = dst; + } else { + path->stroke = NULL; + path->nstroke = 0; + } + } + + return 1; +} + + +// Draw +void nvgBeginPath(NVGcontext* ctx) +{ + ctx->ncommands = 0; + nvg__clearPathCache(ctx); +} + +void nvgMoveTo(NVGcontext* ctx, float x, float y) +{ + float vals[] = { NVG_MOVETO, x, y }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgLineTo(NVGcontext* ctx, float x, float y) +{ + float vals[] = { NVG_LINETO, x, y }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgBezierTo(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 nvgQuadTo(NVGcontext* ctx, float cx, float cy, float x, float y) +{ + float x0 = ctx->commandx; + float y0 = ctx->commandy; + float vals[] = { NVG_BEZIERTO, + x0 + 2.0f/3.0f*(cx - x0), y0 + 2.0f/3.0f*(cy - y0), + x + 2.0f/3.0f*(cx - x), y + 2.0f/3.0f*(cy - y), + x, y }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgArcTo(NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius) +{ + float x0 = ctx->commandx; + float y0 = ctx->commandy; + 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 = nvg__acosf(dx0*dx1 + dy0*dy1); + d = radius / nvg__tanf(a/2.0f); + +// printf("a=%f° d=%f\n", a/NVG_PI*180.0f, d); + + 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 = nvg__atan2f(dx0, -dy0); + a1 = nvg__atan2f(-dx1, dy1); + dir = NVG_CW; +// printf("CW c=(%f, %f) a0=%f° a1=%f°\n", cx, cy, a0/NVG_PI*180.0f, a1/NVG_PI*180.0f); + } else { + cx = x1 + dx0*d + -dy0*radius; + cy = y1 + dy0*d + dx0*radius; + a0 = nvg__atan2f(-dx0, dy0); + a1 = nvg__atan2f(dx1, -dy1); + dir = NVG_CCW; +// printf("CCW c=(%f, %f) a0=%f° a1=%f°\n", cx, cy, a0/NVG_PI*180.0f, a1/NVG_PI*180.0f); + } + + nvgArc(ctx, cx, cy, radius, a0, a1, dir); +} + +void nvgClosePath(NVGcontext* ctx) +{ + float vals[] = { NVG_CLOSE }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgPathWinding(NVGcontext* ctx, int dir) +{ + float vals[] = { NVG_WINDING, (float)dir }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgArc(NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir) +{ + float a = 0, da = 0, hda = 0, kappa = 0; + float dx = 0, dy = 0, x = 0, y = 0, tanx = 0, tany = 0; + float px = 0, py = 0, ptanx = 0, ptany = 0; + 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__maxi(1, 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 - nvg__cosf(hda)) / nvg__sinf(hda)); + + if (dir == NVG_CCW) + kappa = -kappa; + + nvals = 0; + for (i = 0; i <= ndivs; i++) { + a = a0 + da * (i/(float)ndivs); + dx = nvg__cosf(a); + dy = nvg__sinf(a); + x = cx + dx*r; + y = cy + dy*r; + tanx = -dy*r*kappa; + tany = dx*r*kappa; + + if (i == 0) { + vals[nvals++] = (float)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(NVGcontext* ctx, float x, float y, float w, float h) +{ + float vals[] = { + NVG_MOVETO, x,y, + NVG_LINETO, x,y+h, + NVG_LINETO, x+w,y+h, + NVG_LINETO, x+w,y, + NVG_CLOSE + }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); +} + +void nvgRoundedRect(NVGcontext* ctx, float x, float y, float w, float h, float r) +{ + if (r < 0.1f) { + nvgRect(ctx, x,y,w,h); + return; + } + else { + float rx = nvg__minf(r, nvg__absf(w)*0.5f) * nvg__signf(w), ry = nvg__minf(r, nvg__absf(h)*0.5f) * nvg__signf(h); + float vals[] = { + NVG_MOVETO, x, y+ry, + NVG_LINETO, x, y+h-ry, + NVG_BEZIERTO, x, y+h-ry*(1-NVG_KAPPA90), x+rx*(1-NVG_KAPPA90), y+h, x+rx, y+h, + NVG_LINETO, x+w-rx, y+h, + NVG_BEZIERTO, x+w-rx*(1-NVG_KAPPA90), y+h, x+w, y+h-ry*(1-NVG_KAPPA90), x+w, y+h-ry, + NVG_LINETO, x+w, y+ry, + NVG_BEZIERTO, x+w, y+ry*(1-NVG_KAPPA90), x+w-rx*(1-NVG_KAPPA90), y, x+w-rx, y, + NVG_LINETO, x+rx, y, + NVG_BEZIERTO, x+rx*(1-NVG_KAPPA90), y, x, y+ry*(1-NVG_KAPPA90), x, y+ry, + NVG_CLOSE + }; + nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); + } +} + +void nvgEllipse(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(NVGcontext* ctx, float cx, float cy, float r) +{ + nvgEllipse(ctx, cx,cy, r,r); +} + +void nvgDebugDumpPathCache(NVGcontext* ctx) +{ + const NVGpath* path; + int i, j; + + printf("Dumping %d cached paths\n", ctx->cache->npaths); + for (i = 0; i < ctx->cache->npaths; i++) { + path = &ctx->cache->paths[i]; + printf(" - Path %d\n", i); + if (path->nfill) { + printf(" - fill: %d\n", path->nfill); + for (j = 0; j < path->nfill; j++) + printf("%f\t%f\n", path->fill[j].x, path->fill[j].y); + } + if (path->nstroke) { + printf(" - stroke: %d\n", path->nstroke); + for (j = 0; j < path->nstroke; j++) + printf("%f\t%f\n", path->stroke[j].x, path->stroke[j].y); + } + } +} + +void nvgFill(NVGcontext* ctx) +{ + NVGstate* state = nvg__getState(ctx); + const NVGpath* path; + NVGpaint fillPaint = state->fill; + int i; + + nvg__flattenPaths(ctx); + if (ctx->params.edgeAntiAlias) + nvg__expandFill(ctx, ctx->fringeWidth, NVG_MITER, 2.4f); + else + nvg__expandFill(ctx, 0.0f, NVG_MITER, 2.4f); + + // Apply global alpha + fillPaint.innerColor.a *= state->alpha; + fillPaint.outerColor.a *= state->alpha; + + ctx->params.renderFill(ctx->params.userPtr, &fillPaint, &state->scissor, ctx->fringeWidth, + 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(NVGcontext* ctx) +{ + NVGstate* state = nvg__getState(ctx); + float scale = nvg__getAverageScale(state->xform); + float strokeWidth = nvg__clampf(state->strokeWidth * scale, 0.0f, 200.0f); + NVGpaint strokePaint = state->stroke; + const NVGpath* path; + int i; + + if (strokeWidth < ctx->fringeWidth) { + // If the stroke width is less than pixel size, use alpha to emulate coverage. + // Since coverage is area, scale by alpha*alpha. + float alpha = nvg__clampf(strokeWidth / ctx->fringeWidth, 0.0f, 1.0f); + strokePaint.innerColor.a *= alpha*alpha; + strokePaint.outerColor.a *= alpha*alpha; + strokeWidth = ctx->fringeWidth; + } + + // Apply global alpha + strokePaint.innerColor.a *= state->alpha; + strokePaint.outerColor.a *= state->alpha; + + nvg__flattenPaths(ctx); + + if (ctx->params.edgeAntiAlias) + nvg__expandStroke(ctx, strokeWidth*0.5f + ctx->fringeWidth*0.5f, state->lineCap, state->lineJoin, state->miterLimit); + else + nvg__expandStroke(ctx, strokeWidth*0.5f, state->lineCap, state->lineJoin, state->miterLimit); + + ctx->params.renderStroke(ctx->params.userPtr, &strokePaint, &state->scissor, ctx->fringeWidth, + 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(NVGcontext* ctx, const char* name, const char* path) +{ + return fonsAddFont(ctx->fs, name, path); +} + +int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData) +{ + return fonsAddFontMem(ctx->fs, name, data, ndata, freeData); +} + +int nvgFindFont(NVGcontext* ctx, const char* name) +{ + if (name == NULL) return -1; + return fonsGetFontByName(ctx->fs, name); +} + +// State setting +void nvgFontSize(NVGcontext* ctx, float size) +{ + NVGstate* state = nvg__getState(ctx); + state->fontSize = size; +} + +void nvgFontBlur(NVGcontext* ctx, float blur) +{ + NVGstate* state = nvg__getState(ctx); + state->fontBlur = blur; +} + +void nvgTextLetterSpacing(NVGcontext* ctx, float spacing) +{ + NVGstate* state = nvg__getState(ctx); + state->letterSpacing = spacing; +} + +void nvgTextLineHeight(NVGcontext* ctx, float lineHeight) +{ + NVGstate* state = nvg__getState(ctx); + state->lineHeight = lineHeight; +} + +void nvgTextAlign(NVGcontext* ctx, int align) +{ + NVGstate* state = nvg__getState(ctx); + state->textAlign = align; +} + +void nvgFontFaceId(NVGcontext* ctx, int font) +{ + NVGstate* state = nvg__getState(ctx); + state->fontId = font; +} + +void nvgFontFace(NVGcontext* ctx, const char* font) +{ + NVGstate* state = nvg__getState(ctx); + state->fontId = fonsGetFontByName(ctx->fs, font); +} + +static float nvg__quantize(float a, float d) +{ + return ((int)(a / d + 0.5f)) * d; +} + +static float nvg__getFontScale(NVGstate* state) +{ + return nvg__minf(nvg__quantize(nvg__getAverageScale(state->xform), 0.01f), 4.0f); +} + +static void nvg__flushTextTexture(NVGcontext* ctx) +{ + int dirty[4]; + + if (fonsValidateTexture(ctx->fs, dirty)) { + int fontImage = ctx->fontImages[ctx->fontImageIdx]; + // Update texture + if (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, fontImage, x,y, w,h, data); + } + } +} + +static int nvg__allocTextAtlas(NVGcontext* ctx) +{ + int iw, ih; + nvg__flushTextTexture(ctx); + if (ctx->fontImageIdx >= NVG_MAX_FONTIMAGES-1) + return 0; + // if next fontImage already have a texture + if (ctx->fontImages[ctx->fontImageIdx+1] != 0) + nvgImageSize(ctx, ctx->fontImages[ctx->fontImageIdx+1], &iw, &ih); + else { // calculate the new font image size and create it. + nvgImageSize(ctx, ctx->fontImages[ctx->fontImageIdx], &iw, &ih); + if (iw > ih) + ih *= 2; + else + iw *= 2; + if (iw > NVG_MAX_FONTIMAGE_SIZE || ih > NVG_MAX_FONTIMAGE_SIZE) + iw = ih = NVG_MAX_FONTIMAGE_SIZE; + ctx->fontImages[ctx->fontImageIdx+1] = ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_ALPHA, iw, ih, 0, NULL); + } + ++ctx->fontImageIdx; + fonsResetAtlas(ctx->fs, iw, ih); + return 1; +} + +static void nvg__renderText(NVGcontext* ctx, NVGvertex* verts, int nverts) +{ + NVGstate* state = nvg__getState(ctx); + NVGpaint paint = state->fill; + + // Render triangles. + paint.image = ctx->fontImages[ctx->fontImageIdx]; + + // Apply global alpha + paint.innerColor.a *= state->alpha; + paint.outerColor.a *= state->alpha; + + ctx->params.renderTriangles(ctx->params.userPtr, &paint, &state->scissor, verts, nverts); + + ctx->drawCallCount++; + ctx->textTriCount += nverts/3; +} + +float nvgText(NVGcontext* ctx, float x, float y, const char* string, const char* end) +{ + NVGstate* state = nvg__getState(ctx); + FONStextIter iter, prevIter; + FONSquad q; + NVGvertex* verts; + float scale = nvg__getFontScale(state) * ctx->devicePxRatio; + float invscale = 1.0f / scale; + int cverts = 0; + int nverts = 0; + + if (end == NULL) + end = string + strlen(string); + + if (state->fontId == FONS_INVALID) return x; + + 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, (int)(end - string)) * 6; // conservative estimate. + verts = nvg__allocTempVerts(ctx, cverts); + if (verts == NULL) return x; + + fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end); + prevIter = iter; + while (fonsTextIterNext(ctx->fs, &iter, &q)) { + float c[4*2]; + if (iter.prevGlyphIndex == -1) { // can not retrieve glyph? + if (!nvg__allocTextAtlas(ctx)) + break; // no memory :( + if (nverts != 0) { + nvg__renderText(ctx, verts, nverts); + nverts = 0; + } + iter = prevIter; + fonsTextIterNext(ctx->fs, &iter, &q); // try again + if (iter.prevGlyphIndex == -1) // still can not find glyph? + break; + } + prevIter = iter; + // Transform corners. + nvgTransformPoint(&c[0],&c[1], state->xform, q.x0*invscale, q.y0*invscale); + nvgTransformPoint(&c[2],&c[3], state->xform, q.x1*invscale, q.y0*invscale); + nvgTransformPoint(&c[4],&c[5], state->xform, q.x1*invscale, q.y1*invscale); + nvgTransformPoint(&c[6],&c[7], state->xform, q.x0*invscale, q.y1*invscale); + // 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++; + } + } + + // TODO: add back-end bit to do this just once per frame. + nvg__flushTextTexture(ctx); + + nvg__renderText(ctx, verts, nverts); + + return iter.x; +} + +void nvgTextBox(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end) +{ + NVGstate* state = nvg__getState(ctx); + NVGtextRow rows[2]; + int nrows = 0, i; + int oldAlign = state->textAlign; + int haling = state->textAlign & (NVG_ALIGN_LEFT | NVG_ALIGN_CENTER | NVG_ALIGN_RIGHT); + int valign = state->textAlign & (NVG_ALIGN_TOP | NVG_ALIGN_MIDDLE | NVG_ALIGN_BOTTOM | NVG_ALIGN_BASELINE); + float lineh = 0; + + if (state->fontId == FONS_INVALID) return; + + nvgTextMetrics(ctx, NULL, NULL, &lineh); + + state->textAlign = NVG_ALIGN_LEFT | valign; + + while ((nrows = nvgTextBreakLines(ctx, string, end, breakRowWidth, rows, 2))) { + for (i = 0; i < nrows; i++) { + NVGtextRow* row = &rows[i]; + if (haling & NVG_ALIGN_LEFT) + nvgText(ctx, x, y, row->start, row->end); + else if (haling & NVG_ALIGN_CENTER) + nvgText(ctx, x + breakRowWidth*0.5f - row->width*0.5f, y, row->start, row->end); + else if (haling & NVG_ALIGN_RIGHT) + nvgText(ctx, x + breakRowWidth - row->width, y, row->start, row->end); + y += lineh * state->lineHeight; + } + string = rows[nrows-1].next; + } + + state->textAlign = oldAlign; +} + +int nvgTextGlyphPositions(NVGcontext* ctx, float x, float y, const char* string, const char* end, NVGglyphPosition* positions, int maxPositions) +{ + NVGstate* state = nvg__getState(ctx); + float scale = nvg__getFontScale(state) * ctx->devicePxRatio; + float invscale = 1.0f / scale; + FONStextIter iter, prevIter; + FONSquad q; + int npos = 0; + + if (state->fontId == FONS_INVALID) return 0; + + if (end == NULL) + end = string + strlen(string); + + if (string == end) + return 0; + + 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); + + fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end); + prevIter = iter; + while (fonsTextIterNext(ctx->fs, &iter, &q)) { + if (iter.prevGlyphIndex < 0 && nvg__allocTextAtlas(ctx)) { // can not retrieve glyph? + iter = prevIter; + fonsTextIterNext(ctx->fs, &iter, &q); // try again + } + prevIter = iter; + positions[npos].str = iter.str; + positions[npos].x = iter.x * invscale; + positions[npos].minx = nvg__minf(iter.x, q.x0) * invscale; + positions[npos].maxx = nvg__maxf(iter.nextx, q.x1) * invscale; + npos++; + if (npos >= maxPositions) + break; + } + + return npos; +} + +enum NVGcodepointType { + NVG_SPACE, + NVG_NEWLINE, + NVG_CHAR, +}; + +int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, NVGtextRow* rows, int maxRows) +{ + NVGstate* state = nvg__getState(ctx); + float scale = nvg__getFontScale(state) * ctx->devicePxRatio; + float invscale = 1.0f / scale; + FONStextIter iter, prevIter; + FONSquad q; + int nrows = 0; + float rowStartX = 0; + float rowWidth = 0; + float rowMinX = 0; + float rowMaxX = 0; + const char* rowStart = NULL; + const char* rowEnd = NULL; + const char* wordStart = NULL; + float wordStartX = 0; + float wordMinX = 0; + const char* breakEnd = NULL; + float breakWidth = 0; + float breakMaxX = 0; + int type = NVG_SPACE, ptype = NVG_SPACE; + unsigned int pcodepoint = 0; + + if (maxRows == 0) return 0; + if (state->fontId == FONS_INVALID) return 0; + + if (end == NULL) + end = string + strlen(string); + + if (string == end) return 0; + + 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); + + breakRowWidth *= scale; + + fonsTextIterInit(ctx->fs, &iter, 0, 0, string, end); + prevIter = iter; + while (fonsTextIterNext(ctx->fs, &iter, &q)) { + if (iter.prevGlyphIndex < 0 && nvg__allocTextAtlas(ctx)) { // can not retrieve glyph? + iter = prevIter; + fonsTextIterNext(ctx->fs, &iter, &q); // try again + } + prevIter = iter; + switch (iter.codepoint) { + case 9: // \t + case 11: // \v + case 12: // \f + case 32: // space + case 0x00a0: // NBSP + type = NVG_SPACE; + break; + case 10: // \n + type = pcodepoint == 13 ? NVG_SPACE : NVG_NEWLINE; + break; + case 13: // \r + type = pcodepoint == 10 ? NVG_SPACE : NVG_NEWLINE; + break; + case 0x0085: // NEL + type = NVG_NEWLINE; + break; + default: + type = NVG_CHAR; + break; + } + + if (type == NVG_NEWLINE) { + // Always handle new lines. + rows[nrows].start = rowStart != NULL ? rowStart : iter.str; + rows[nrows].end = rowEnd != NULL ? rowEnd : iter.str; + rows[nrows].width = rowWidth * invscale; + rows[nrows].minx = rowMinX * invscale; + rows[nrows].maxx = rowMaxX * invscale; + rows[nrows].next = iter.next; + nrows++; + if (nrows >= maxRows) + return nrows; + // Set null break point + breakEnd = rowStart; + breakWidth = 0.0; + breakMaxX = 0.0; + // Indicate to skip the white space at the beginning of the row. + rowStart = NULL; + rowEnd = NULL; + rowWidth = 0; + rowMinX = rowMaxX = 0; + } else { + if (rowStart == NULL) { + // Skip white space until the beginning of the line + if (type == NVG_CHAR) { + // The current char is the row so far + rowStartX = iter.x; + rowStart = iter.str; + rowEnd = iter.next; + rowWidth = iter.nextx - rowStartX; // q.x1 - rowStartX; + rowMinX = q.x0 - rowStartX; + rowMaxX = q.x1 - rowStartX; + wordStart = iter.str; + wordStartX = iter.x; + wordMinX = q.x0 - rowStartX; + // Set null break point + breakEnd = rowStart; + breakWidth = 0.0; + breakMaxX = 0.0; + } + } else { + float nextWidth = iter.nextx - rowStartX; + + // track last non-white space character + if (type == NVG_CHAR) { + rowEnd = iter.next; + rowWidth = iter.nextx - rowStartX; + rowMaxX = q.x1 - rowStartX; + } + // track last end of a word + if (ptype == NVG_CHAR && type == NVG_SPACE) { + breakEnd = iter.str; + breakWidth = rowWidth; + breakMaxX = rowMaxX; + } + // track last beginning of a word + if (ptype == NVG_SPACE && type == NVG_CHAR) { + wordStart = iter.str; + wordStartX = iter.x; + wordMinX = q.x0 - rowStartX; + } + + // Break to new line when a character is beyond break width. + if (type == NVG_CHAR && nextWidth > breakRowWidth) { + // The run length is too long, need to break to new line. + if (breakEnd == rowStart) { + // The current word is longer than the row length, just break it from here. + rows[nrows].start = rowStart; + rows[nrows].end = iter.str; + rows[nrows].width = rowWidth * invscale; + rows[nrows].minx = rowMinX * invscale; + rows[nrows].maxx = rowMaxX * invscale; + rows[nrows].next = iter.str; + nrows++; + if (nrows >= maxRows) + return nrows; + rowStartX = iter.x; + rowStart = iter.str; + rowEnd = iter.next; + rowWidth = iter.nextx - rowStartX; + rowMinX = q.x0 - rowStartX; + rowMaxX = q.x1 - rowStartX; + wordStart = iter.str; + wordStartX = iter.x; + wordMinX = q.x0 - rowStartX; + } else { + // Break the line from the end of the last word, and start new line from the beginning of the new. + rows[nrows].start = rowStart; + rows[nrows].end = breakEnd; + rows[nrows].width = breakWidth * invscale; + rows[nrows].minx = rowMinX * invscale; + rows[nrows].maxx = breakMaxX * invscale; + rows[nrows].next = wordStart; + nrows++; + if (nrows >= maxRows) + return nrows; + rowStartX = wordStartX; + rowStart = wordStart; + rowEnd = iter.next; + rowWidth = iter.nextx - rowStartX; + rowMinX = wordMinX; + rowMaxX = q.x1 - rowStartX; + // No change to the word start + } + // Set null break point + breakEnd = rowStart; + breakWidth = 0.0; + breakMaxX = 0.0; + } + } + } + + pcodepoint = iter.codepoint; + ptype = type; + } + + // Break the line from the end of the last word, and start new line from the beginning of the new. + if (rowStart != NULL) { + rows[nrows].start = rowStart; + rows[nrows].end = rowEnd; + rows[nrows].width = rowWidth * invscale; + rows[nrows].minx = rowMinX * invscale; + rows[nrows].maxx = rowMaxX * invscale; + rows[nrows].next = end; + nrows++; + } + + return nrows; +} + +float nvgTextBounds(NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds) +{ + NVGstate* state = nvg__getState(ctx); + float scale = nvg__getFontScale(state) * ctx->devicePxRatio; + float invscale = 1.0f / scale; + float width; + + if (state->fontId == FONS_INVALID) return 0; + + 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); + + width = fonsTextBounds(ctx->fs, x*scale, y*scale, string, end, bounds); + if (bounds != NULL) { + // Use line bounds for height. + fonsLineBounds(ctx->fs, y*scale, &bounds[1], &bounds[3]); + bounds[0] *= invscale; + bounds[1] *= invscale; + bounds[2] *= invscale; + bounds[3] *= invscale; + } + return width * invscale; +} + +void nvgTextBoxBounds(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds) +{ + NVGstate* state = nvg__getState(ctx); + NVGtextRow rows[2]; + float scale = nvg__getFontScale(state) * ctx->devicePxRatio; + float invscale = 1.0f / scale; + int nrows = 0, i; + int oldAlign = state->textAlign; + int haling = state->textAlign & (NVG_ALIGN_LEFT | NVG_ALIGN_CENTER | NVG_ALIGN_RIGHT); + int valign = state->textAlign & (NVG_ALIGN_TOP | NVG_ALIGN_MIDDLE | NVG_ALIGN_BOTTOM | NVG_ALIGN_BASELINE); + float lineh = 0, rminy = 0, rmaxy = 0; + float minx, miny, maxx, maxy; + + if (state->fontId == FONS_INVALID) { + if (bounds != NULL) + bounds[0] = bounds[1] = bounds[2] = bounds[3] = 0.0f; + return; + } + + nvgTextMetrics(ctx, NULL, NULL, &lineh); + + state->textAlign = NVG_ALIGN_LEFT | valign; + + minx = maxx = x; + miny = maxy = y; + + 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); + fonsLineBounds(ctx->fs, 0, &rminy, &rmaxy); + rminy *= invscale; + rmaxy *= invscale; + + while ((nrows = nvgTextBreakLines(ctx, string, end, breakRowWidth, rows, 2))) { + for (i = 0; i < nrows; i++) { + NVGtextRow* row = &rows[i]; + float rminx, rmaxx, dx = 0; + // Horizontal bounds + if (haling & NVG_ALIGN_LEFT) + dx = 0; + else if (haling & NVG_ALIGN_CENTER) + dx = breakRowWidth*0.5f - row->width*0.5f; + else if (haling & NVG_ALIGN_RIGHT) + dx = breakRowWidth - row->width; + rminx = x + row->minx + dx; + rmaxx = x + row->maxx + dx; + minx = nvg__minf(minx, rminx); + maxx = nvg__maxf(maxx, rmaxx); + // Vertical bounds. + miny = nvg__minf(miny, y + rminy); + maxy = nvg__maxf(maxy, y + rmaxy); + + y += lineh * state->lineHeight; + } + string = rows[nrows-1].next; + } + + state->textAlign = oldAlign; + + if (bounds != NULL) { + bounds[0] = minx; + bounds[1] = miny; + bounds[2] = maxx; + bounds[3] = maxy; + } +} + +void nvgTextMetrics(NVGcontext* ctx, float* ascender, float* descender, float* lineh) +{ + NVGstate* state = nvg__getState(ctx); + float scale = nvg__getFontScale(state) * ctx->devicePxRatio; + float invscale = 1.0f / scale; + + 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); + + fonsVertMetrics(ctx->fs, ascender, descender, lineh); + if (ascender != NULL) + *ascender *= invscale; + if (descender != NULL) + *descender *= invscale; + if (lineh != NULL) + *lineh *= invscale; +} +// vim: ft=c nu noet ts=4 diff --git a/demo/nanovg/stb_image.h b/demo/nanovg/stb_image.h index 0c61065..4da7ec6 100644 --- a/demo/nanovg/stb_image.h +++ b/demo/nanovg/stb_image.h @@ -4127,8 +4127,7 @@ static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, i static stbi_uc *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) { stbi_uc *u = 0; - stbi__gif g; - memset(&g, 0, sizeof(g)); + 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