DPF

nanovg.c (83231B)

---

 //
 // 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 <stdlib.h>
 #include <stdio.h>
 #include <math.h>
 #include <memory.h>
 
 #include "nanovg.h"
 #define FONTSTASH_IMPLEMENTATION
 #define stbtt_fontinfo dpf_nvg_stbtt_fontinfo
 #define stbrp_context dpf_nvg_stbrp_context
 #define stbrp_rect dpf_nvg_stbrp_rect
 #define stbrp_node dpf_nvg_stbrp_node
 #define stbrp_coord dpf_nvg_stbrp_coord
 #include "fontstash.h"
 
 #ifndef NVG_NO_STB
 #define STB_IMAGE_IMPLEMENTATION
 #define stbi_convert_iphone_png_to_rgb dpf_stbi_convert_iphone_png_to_rgb
 #define stbi_failure_reason dpf_stbi_failure_reason
 #define stbi_hdr_to_ldr_gamma dpf_stbi_hdr_to_ldr_gamma
 #define stbi_hdr_to_ldr_scale dpf_stbi_hdr_to_ldr_scale
 #define stbi_image_free dpf_stbi_image_free
 #define stbi_info dpf_stbi_info
 #define stbi_info_from_callbacks dpf_stbi_info_from_callbacks
 #define stbi_info_from_file dpf_stbi_info_from_file
 #define stbi_info_from_memory dpf_stbi_info_from_memory
 #define stbi_is_hdr dpf_stbi_is_hdr
 #define stbi_is_hdr_from_callbacks dpf_stbi_is_hdr_from_callbacks
 #define stbi_is_hdr_from_file dpf_stbi_is_hdr_from_file
 #define stbi_is_hdr_from_memory dpf_stbi_is_hdr_from_memory
 #define stbi_ldr_to_hdr_gamma dpf_stbi_ldr_to_hdr_gamma
 #define stbi_ldr_to_hdr_scale dpf_stbi_ldr_to_hdr_scale
 #define stbi_load dpf_stbi_load
 #define stbi_load_from_callbacks dpf_stbi_load_from_callbacks
 #define stbi_load_from_file dpf_stbi_load_from_file
 #define stbi_load_from_memory dpf_stbi_load_from_memory
 #define stbi_loadf dpf_stbi_loadf
 #define stbi_loadf_from_callbacks dpf_stbi_loadf_from_callbacks
 #define stbi_loadf_from_file dpf_stbi_loadf_from_file
 #define stbi_loadf_from_memory dpf_stbi_loadf_from_memory
 #define stbi_set_flip_vertically_on_load dpf_stbi_set_flip_vertically_on_load
 #define stbi_set_unpremultiply_on_load dpf_stbi_set_unpremultiply_on_load
 #define stbi_zlib_decode_buffer dpf_stbi_zlib_decode_buffer
 #define stbi_zlib_decode_malloc dpf_stbi_zlib_decode_malloc
 #define stbi_zlib_decode_malloc_guesssize dpf_stbi_zlib_decode_malloc_guesssize
 #define stbi_zlib_decode_malloc_guesssize_headerflag dpf_stbi_zlib_decode_malloc_guesssize_headerflag
 #define stbi_zlib_decode_noheader_buffer dpf_stbi_zlib_decode_noheader_buffer
 #define stbi_zlib_decode_noheader_malloc dpf_stbi_zlib_decode_noheader_malloc
 #include "stb_image.h"
 #endif
 
 #ifdef NVG_DISABLE_SKIPPING_WHITESPACE
 #define NVG_SKIPPED_CHAR NVG_SPACE
 #else
 #define NVG_SKIPPED_CHAR NVG_CHAR
 #endif
 
 #ifndef NVG_FONT_TEXTURE_FLAGS
 #define NVG_FONT_TEXTURE_FLAGS 0
 #endif
 
 #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 {
 	NVGcompositeOperationState compositeOperation;
 	int shapeAntiAlias;
 	NVGpaint fill;
 	NVGpaint stroke;
 	float strokeWidth;
 	float miterLimit;
 	int lineJoin;
 	int lineCap;
 	NVGcolor tint;
 	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 NVGfontContext {  // Fontstash context plus font images; shared between shared NanoVG contexts.
 	int refCount;
 	struct FONScontext* fs;
 	int fontImages[NVG_MAX_FONTIMAGES];
 	int fontImageIdx;
 };
 typedef struct NVGfontContext NVGfontContext;
 
 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;
 	NVGfontContext* fontContext;
 	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;
 }
 
 static NVGcompositeOperationState nvg__compositeOperationState(int op)
 {
 	int sfactor, dfactor;
 
 	if (op == NVG_SOURCE_OVER)
 	{
 		sfactor = NVG_ONE;
 		dfactor = NVG_ONE_MINUS_SRC_ALPHA;
 	}
 	else if (op == NVG_SOURCE_IN)
 	{
 		sfactor = NVG_DST_ALPHA;
 		dfactor = NVG_ZERO;
 	}
 	else if (op == NVG_SOURCE_OUT)
 	{
 		sfactor = NVG_ONE_MINUS_DST_ALPHA;
 		dfactor = NVG_ZERO;
 	}
 	else if (op == NVG_ATOP)
 	{
 		sfactor = NVG_DST_ALPHA;
 		dfactor = NVG_ONE_MINUS_SRC_ALPHA;
 	}
 	else if (op == NVG_DESTINATION_OVER)
 	{
 		sfactor = NVG_ONE_MINUS_DST_ALPHA;
 		dfactor = NVG_ONE;
 	}
 	else if (op == NVG_DESTINATION_IN)
 	{
 		sfactor = NVG_ZERO;
 		dfactor = NVG_SRC_ALPHA;
 	}
 	else if (op == NVG_DESTINATION_OUT)
 	{
 		sfactor = NVG_ZERO;
 		dfactor = NVG_ONE_MINUS_SRC_ALPHA;
 	}
 	else if (op == NVG_DESTINATION_ATOP)
 	{
 		sfactor = NVG_ONE_MINUS_DST_ALPHA;
 		dfactor = NVG_SRC_ALPHA;
 	}
 	else if (op == NVG_LIGHTER)
 	{
 		sfactor = NVG_ONE;
 		dfactor = NVG_ONE;
 	}
 	else if (op == NVG_COPY)
 	{
 		sfactor = NVG_ONE;
 		dfactor = NVG_ZERO;
 	}
 	else if (op == NVG_XOR)
 	{
 		sfactor = NVG_ONE_MINUS_DST_ALPHA;
 		dfactor = NVG_ONE_MINUS_SRC_ALPHA;
 	}
 	else
 	{
 		sfactor = NVG_ONE;
 		dfactor = NVG_ZERO;
 	}
 
 	NVGcompositeOperationState state;
 	state.srcRGB = sfactor;
 	state.dstRGB = dfactor;
 	state.srcAlpha = sfactor;
 	state.dstAlpha = dfactor;
 	return state;
 }
 
 static NVGstate* nvg__getState(NVGcontext* ctx)
 {
 	return &ctx->states[ctx->nstates-1];
 }
 
 NVGcontext* nvgCreateInternal(NVGparams* params, NVGcontext* other)  // Share the fonts and images of 'other' if it's non-NULL.
 {
 	FONSparams fontParams;
 	NVGcontext* ctx = (NVGcontext*)malloc(sizeof(NVGcontext));
 	int i;
 	if (ctx == NULL) goto error;
 	memset(ctx, 0, sizeof(NVGcontext));
 
 	ctx->params = *params;
 	if (other) {
 		ctx->fontContext = other->fontContext;
 		ctx->fontContext->refCount++;
 	} else {
 		ctx->fontContext = (NVGfontContext*)malloc(sizeof(NVGfontContext));
 		if (ctx->fontContext == NULL) goto error;
 		for (i = 0; i < NVG_MAX_FONTIMAGES; i++)
 			ctx->fontContext->fontImages[i] = 0;
 		ctx->fontContext->refCount = 1;
 	}
 
 	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, other ? other->params.userPtr : NULL) == 0) goto error;
 
 	// Init font rendering
 	if (!other) {
 		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->fontContext->fs = fonsCreateInternal(&fontParams);
 		if (ctx->fontContext->fs == NULL) goto error;
 
 		// Create font texture
 		ctx->fontContext->fontImages[0] = ctx->params.renderCreateTexture(ctx->params.userPtr,
 		                                                                  NVG_TEXTURE_ALPHA,
 		                                                                  fontParams.width,
 		                                                                  fontParams.height,
 		                                                                  NVG_FONT_TEXTURE_FLAGS,
 		                                                                  NULL);
 		if (ctx->fontContext->fontImages[0] == 0) goto error;
 		ctx->fontContext->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->fontContext != NULL && --ctx->fontContext->refCount == 0) {
 		if (ctx->fontContext->fs)
 			fonsDeleteInternal(ctx->fontContext->fs);
 
 		for (i = 0; i < NVG_MAX_FONTIMAGES; i++) {
 			if (ctx->fontContext->fontImages[i] != 0) {
 				nvgDeleteImage(ctx, ctx->fontContext->fontImages[i]);
 				ctx->fontContext->fontImages[i] = 0;
 			}
 		}
 
 		free(ctx->fontContext);
 	}
 
 	if (ctx->params.renderDelete != NULL)
 		ctx->params.renderDelete(ctx->params.userPtr);
 
 	free(ctx);
 }
 
 void nvgBeginFrame(NVGcontext* ctx, float windowWidth, float 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, devicePixelRatio);
 
 	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->fontContext->fontImageIdx != 0) {
 		int fontImage = ctx->fontContext->fontImages[ctx->fontContext->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->fontContext->fontImageIdx; i++) {
 			if (ctx->fontContext->fontImages[i] != 0) {
 				int nw, nh;
 				nvgImageSize(ctx, ctx->fontContext->fontImages[i], &nw, &nh);
 				if (nw < iw || nh < ih)
 					nvgDeleteImage(ctx, ctx->fontContext->fontImages[i]);
 				else
 					ctx->fontContext->fontImages[j++] = ctx->fontContext->fontImages[i];
 			}
 		}
 		// make current font image to first
 		ctx->fontContext->fontImages[j++] = ctx->fontContext->fontImages[0];
 		ctx->fontContext->fontImages[0] = fontImage;
 		ctx->fontContext->fontImageIdx = 0;
 		// clear all images after j
 		for (i = j; i < NVG_MAX_FONTIMAGES; i++)
 			ctx->fontContext->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 = {{{0}}};
 
 	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;
 }
 
 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->compositeOperation = nvg__compositeOperationState(NVG_SOURCE_OVER);
 	state->shapeAntiAlias = 1;
 	state->strokeWidth = 1.0f;
 	state->miterLimit = 10.0f;
 	state->lineCap = NVG_BUTT;
 	state->lineJoin = NVG_MITER;
 	state->tint = nvgRGBAf(1, 1, 1, 1);
 	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 nvgShapeAntiAlias(NVGcontext* ctx, int enabled)
 {
 	NVGstate* state = nvg__getState(ctx);
 	state->shapeAntiAlias = enabled;
 }
 
 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->tint.a = alpha;
 }
 
 void nvgGlobalTint(NVGcontext* ctx, NVGcolor tint)
 {
 	NVGstate* state = nvg__getState(ctx);
 	state->tint = tint;
 }
 
 NVGcolor nvgGetGlobalTint(NVGcontext* ctx)
 {
 	NVGstate* state = nvg__getState(ctx);
 	return state->tint;
 }
 
 void nvgAlpha(NVGcontext* ctx, float alpha)
 {
 	NVGstate* state = nvg__getState(ctx);
 	state->tint.a *= alpha;
 }
 
 void nvgTint(NVGcontext* ctx, NVGcolor tint)
 {
 	NVGstate* state = nvg__getState(ctx);
 	int i;
 	for (i = 0; i < 4; i++)
 		state->tint.rgba[i] *= tint.rgba[i];
 }
 
 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);
 }
 
 #ifndef NVG_NO_STB
 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, const 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;
 }
 #endif
 
 int nvgCreateImageRaw(NVGcontext* ctx, int w, int h, int imageFlags, NVGtexture format, const unsigned char* data)
 {
 	return ctx->params.renderCreateTexture(ctx->params.userPtr, format, w, h, imageFlags, data);
 }
 
 int nvgCreateImageRGBA(NVGcontext* ctx, int w, int h, int imageFlags, const unsigned char* data)
 {
 	return nvgCreateImageRaw(ctx, w, h, imageFlags, NVG_TEXTURE_RGBA, 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;
 }
 
 // Global composite operation.
 void nvgGlobalCompositeOperation(NVGcontext* ctx, int op)
 {
 	NVGstate* state = nvg__getState(ctx);
 	state->compositeOperation = nvg__compositeOperationState(op);
 }
 
 void nvgGlobalCompositeBlendFunc(NVGcontext* ctx, int sfactor, int dfactor)
 {
 	nvgGlobalCompositeBlendFuncSeparate(ctx, sfactor, dfactor, sfactor, dfactor);
 }
 
 void nvgGlobalCompositeBlendFuncSeparate(NVGcontext* ctx, int srcRGB, int dstRGB, int srcAlpha, int dstAlpha)
 {
 	NVGcompositeOperationState op;
 	op.srcRGB = srcRGB;
 	op.dstRGB = dstRGB;
 	op.srcAlpha = srcAlpha;
 	op.dstAlpha = dstAlpha;
 
 	NVGstate* state = nvg__getState(ctx);
 	state->compositeOperation = op;
 }
 
 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 u0, float u1)
 {
 	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, u0,0); dst++;
 	nvg__vset(dst, px - dlx*w - dx*aa, py - dly*w - dy*aa, u1,0); dst++;
 	nvg__vset(dst, px + dlx*w, py + dly*w, u0,1); dst++;
 	nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); dst++;
 	return dst;
 }
 
 static NVGvertex* nvg__buttCapEnd(NVGvertex* dst, NVGpoint* p,
 								  float dx, float dy, float w, float d,
 								  float aa, float u0, float u1)
 {
 	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, u0,1); dst++;
 	nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); dst++;
 	nvg__vset(dst, px + dlx*w + dx*aa, py + dly*w + dy*aa, u0,0); dst++;
 	nvg__vset(dst, px - dlx*w + dx*aa, py - dly*w + dy*aa, u1,0); dst++;
 	return dst;
 }
 
 
 static NVGvertex* nvg__roundCapStart(NVGvertex* dst, NVGpoint* p,
 									 float dx, float dy, float w, int ncap,
 									 float aa, float u0, float u1)
 {
 	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, u0,1); dst++;
 		nvg__vset(dst, px, py, 0.5f,1); dst++;
 	}
 	nvg__vset(dst, px + dlx*w, py + dly*w, u0,1); dst++;
 	nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); dst++;
 	return dst;
 }
 
 static NVGvertex* nvg__roundCapEnd(NVGvertex* dst, NVGpoint* p,
 								   float dx, float dy, float w, int ncap,
 								   float aa, float u0, float u1)
 {
 	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, u0,1); dst++;
 	nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); 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, u0,1); 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, float fringe, int lineCap, int lineJoin, float miterLimit)
 {
 	NVGpathCache* cache = ctx->cache;
 	NVGvertex* verts;
 	NVGvertex* dst;
 	int cverts, i, j;
 	float aa = fringe;//ctx->fringeWidth;
 	float u0 = 0.0f, u1 = 1.0f;
 	int ncap = nvg__curveDivs(w, NVG_PI, ctx->tessTol);	// Calculate divisions per half circle.
 
 	w += aa * 0.5f;
 
 	// Disable the gradient used for antialiasing when antialiasing is not used.
 	if (aa == 0.0f) {
 		u0 = 0.5f;
 		u1 = 0.5f;
 	}
 
 	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, u0, u1);
 			else if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE)
 				dst = nvg__buttCapStart(dst, p0, dx, dy, w, w-aa, aa, u0, u1);
 			else if (lineCap == NVG_ROUND)
 				dst = nvg__roundCapStart(dst, p0, dx, dy, w, ncap, aa, u0, u1);
 		}
 
 		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, u0, u1, ncap, aa);
 				} else {
 					dst = nvg__bevelJoin(dst, p0, p1, w, w, u0, u1, aa);
 				}
 			} else {
 				nvg__vset(dst, p1->x + (p1->dmx * w), p1->y + (p1->dmy * w), u0,1); dst++;
 				nvg__vset(dst, p1->x - (p1->dmx * w), p1->y - (p1->dmy * w), u1,1); dst++;
 			}
 			p0 = p1++;
 		}
 
 		if (loop) {
 			// Loop it
 			nvg__vset(dst, verts[0].x, verts[0].y, u0,1); dst++;
 			nvg__vset(dst, verts[1].x, verts[1].y, u1,1); 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, u0, u1);
 			else if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE)
 				dst = nvg__buttCapEnd(dst, p1, dx, dy, w, w-aa, aa, u0, u1);
 			else if (lineCap == NVG_ROUND)
 				dst = nvg__roundCapEnd(dst, p1, dx, dy, w, ncap, aa, u0, u1);
 		}
 
 		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)
 {
 	nvgRoundedRectVarying(ctx, x, y, w, h, r, r, r, r);
 }
 
 void nvgRoundedRectVarying(NVGcontext* ctx, float x, float y, float w, float h, float radTopLeft, float radTopRight, float radBottomRight, float radBottomLeft)
 {
 	if(radTopLeft < 0.1f && radTopRight < 0.1f && radBottomRight < 0.1f && radBottomLeft < 0.1f) {
 		nvgRect(ctx, x, y, w, h);
 		return;
 	} else {
 		float halfw = nvg__absf(w)*0.5f;
 		float halfh = nvg__absf(h)*0.5f;
 		float rxBL = nvg__minf(radBottomLeft, halfw) * nvg__signf(w), ryBL = nvg__minf(radBottomLeft, halfh) * nvg__signf(h);
 		float rxBR = nvg__minf(radBottomRight, halfw) * nvg__signf(w), ryBR = nvg__minf(radBottomRight, halfh) * nvg__signf(h);
 		float rxTR = nvg__minf(radTopRight, halfw) * nvg__signf(w), ryTR = nvg__minf(radTopRight, halfh) * nvg__signf(h);
 		float rxTL = nvg__minf(radTopLeft, halfw) * nvg__signf(w), ryTL = nvg__minf(radTopLeft, halfh) * nvg__signf(h);
 		float vals[] = {
 			NVG_MOVETO, x, y + ryTL,
 			NVG_LINETO, x, y + h - ryBL,
 			NVG_BEZIERTO, x, y + h - ryBL*(1 - NVG_KAPPA90), x + rxBL*(1 - NVG_KAPPA90), y + h, x + rxBL, y + h,
 			NVG_LINETO, x + w - rxBR, y + h,
 			NVG_BEZIERTO, x + w - rxBR*(1 - NVG_KAPPA90), y + h, x + w, y + h - ryBR*(1 - NVG_KAPPA90), x + w, y + h - ryBR,
 			NVG_LINETO, x + w, y + ryTR,
 			NVG_BEZIERTO, x + w, y + ryTR*(1 - NVG_KAPPA90), x + w - rxTR*(1 - NVG_KAPPA90), y, x + w - rxTR, y,
 			NVG_LINETO, x + rxTL, y,
 			NVG_BEZIERTO, x + rxTL*(1 - NVG_KAPPA90), y, x, y + ryTL*(1 - NVG_KAPPA90), x, y + ryTL,
 			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 && state->shapeAntiAlias)
 		nvg__expandFill(ctx, ctx->fringeWidth, NVG_MITER, 2.4f);
 	else
 		nvg__expandFill(ctx, 0.0f, NVG_MITER, 2.4f);
 
 	// Apply global tint
 	for (i = 0; i < 4; i++) {
 		fillPaint.innerColor.rgba[i] *= state->tint.rgba[i];
 		fillPaint.outerColor.rgba[i] *= state->tint.rgba[i];
 	}
 
 	ctx->params.renderFill(ctx->params.userPtr, &fillPaint, state->compositeOperation, &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 tint
 	for (i = 0; i < 4; i++) {
 		strokePaint.innerColor.rgba[i] *= state->tint.rgba[i];
 		strokePaint.outerColor.rgba[i] *= state->tint.rgba[i];
 	}
 
 	nvg__flattenPaths(ctx);
 
 	if (ctx->params.edgeAntiAlias && state->shapeAntiAlias)
 		nvg__expandStroke(ctx, strokeWidth*0.5f, ctx->fringeWidth, state->lineCap, state->lineJoin, state->miterLimit);
 	else
 		nvg__expandStroke(ctx, strokeWidth*0.5f, 0.0f, state->lineCap, state->lineJoin, state->miterLimit);
 
 	ctx->params.renderStroke(ctx->params.userPtr, &strokePaint, state->compositeOperation, &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* filename)
 {
 	return fonsAddFont(ctx->fontContext->fs, name, filename, 0);
 }
 
 int nvgCreateFontAtIndex(NVGcontext* ctx, const char* name, const char* filename, const int fontIndex)
 {
 	return fonsAddFont(ctx->fontContext->fs, name, filename, fontIndex);
 }
 
 int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData)
 {
 	return fonsAddFontMem(ctx->fontContext->fs, name, data, ndata, freeData, 0);
 }
 
 int nvgCreateFontMemAtIndex(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData, const int fontIndex)
 {
 	return fonsAddFontMem(ctx->fontContext->fs, name, data, ndata, freeData, fontIndex);
 }
 
 int nvgFindFont(NVGcontext* ctx, const char* name)
 {
 	if (name == NULL) return -1;
 	return fonsGetFontByName(ctx->fontContext->fs, name);
 }
 
 
 int nvgAddFallbackFontId(NVGcontext* ctx, int baseFont, int fallbackFont)
 {
 	if(baseFont == -1 || fallbackFont == -1) return 0;
 	return fonsAddFallbackFont(ctx->fontContext->fs, baseFont, fallbackFont);
 }
 
 int nvgAddFallbackFont(NVGcontext* ctx, const char* baseFont, const char* fallbackFont)
 {
 	return nvgAddFallbackFontId(ctx, nvgFindFont(ctx, baseFont), nvgFindFont(ctx, fallbackFont));
 }
 
 void nvgResetFallbackFontsId(NVGcontext* ctx, int baseFont)
 {
 	fonsResetFallbackFont(ctx->fontContext->fs, baseFont);
 }
 
 void nvgResetFallbackFonts(NVGcontext* ctx, const char* baseFont)
 {
 	nvgResetFallbackFontsId(ctx, nvgFindFont(ctx, baseFont));
 }
 
 // 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->fontContext->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->fontContext->fs, dirty)) {
 		int fontImage = ctx->fontContext->fontImages[ctx->fontContext->fontImageIdx];
 		// Update texture
 		if (fontImage != 0) {
 			int iw, ih;
 			const unsigned char* data = fonsGetTextureData(ctx->fontContext->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->fontContext->fontImageIdx >= NVG_MAX_FONTIMAGES-1)
 		return 0;
 	// if next fontImage already have a texture
 	if (ctx->fontContext->fontImages[ctx->fontContext->fontImageIdx+1] != 0)
 		nvgImageSize(ctx, ctx->fontContext->fontImages[ctx->fontContext->fontImageIdx+1], &iw, &ih);
 	else { // calculate the new font image size and create it.
 		nvgImageSize(ctx, ctx->fontContext->fontImages[ctx->fontContext->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->fontContext->fontImages[ctx->fontContext->fontImageIdx+1]
 			= ctx->params.renderCreateTexture(ctx->params.userPtr,
 			                                  NVG_TEXTURE_ALPHA, iw, ih, NVG_FONT_TEXTURE_FLAGS, NULL);
 	}
 	++ctx->fontContext->fontImageIdx;
 	fonsResetAtlas(ctx->fontContext->fs, iw, ih);
 	return 1;
 }
 
 static void nvg__renderText(NVGcontext* ctx, NVGvertex* verts, int nverts)
 {
 	int i;
 	NVGstate* state = nvg__getState(ctx);
 	NVGpaint paint = state->fill;
 
 	// Render triangles.
 	paint.image = ctx->fontContext->fontImages[ctx->fontContext->fontImageIdx];
 
 	// Apply global tint
 	for (i = 0; i < 4; i++) {
 		paint.innerColor.rgba[i] *= state->tint.rgba[i];
 		paint.outerColor.rgba[i] *= state->tint.rgba[i];
 	}
 
 	ctx->params.renderTriangles(ctx->params.userPtr, &paint, state->compositeOperation, &state->scissor, verts, nverts, ctx->fringeWidth);
 
 	ctx->drawCallCount++;
 	ctx->textTriCount += nverts/3;
 }
 
 static int nvg__isTransformFlipped(const float *xform)
 {
 	float det = xform[0] * xform[3] - xform[2] * xform[1];
 	return( det < 0);
 }
 
 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;
 	int isFlipped = nvg__isTransformFlipped(state->xform);
 
 	if (end == NULL)
 		end = string + strlen(string);
 
 	if (state->fontId == FONS_INVALID) return x;
 
 	fonsSetSize(ctx->fontContext->fs, state->fontSize*scale);
 	fonsSetSpacing(ctx->fontContext->fs, state->letterSpacing*scale);
 	fonsSetBlur(ctx->fontContext->fs, state->fontBlur*scale);
 	fonsSetAlign(ctx->fontContext->fs, state->textAlign);
 	fonsSetFont(ctx->fontContext->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->fontContext->fs, &iter, x*scale, y*scale, string, end, FONS_GLYPH_BITMAP_REQUIRED);
 	prevIter = iter;
 	while (fonsTextIterNext(ctx->fontContext->fs, &iter, &q)) {
 		float c[4*2];
 		if (iter.prevGlyphIndex == -1) { // can not retrieve glyph?
 			if (nverts != 0) {
 				nvg__renderText(ctx, verts, nverts);
 				nverts = 0;
 			}
 			if (!nvg__allocTextAtlas(ctx))
 				break; // no memory :(
 			iter = prevIter;
 			fonsTextIterNext(ctx->fontContext->fs, &iter, &q); // try again
 			if (iter.prevGlyphIndex == -1) // still can not find glyph?
 				break;
 		}
 		prevIter = iter;
 		if(isFlipped) {
 			float tmp;
 
 			tmp = q.y0; q.y0 = q.y1; q.y1 = tmp;
 			tmp = q.t0; q.t0 = q.t1; q.t1 = tmp;
 		}
 		// 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) {
 #if NVG_FONT_TEXTURE_FLAGS
 			// align font kerning to integer pixel positions
 			for (int i = 0; i < 8; ++i)
 				c[i] = (int)(c[i] + 0.5f);
 #endif
 			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.nextx / scale;
 }
 
 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->fontContext->fs, state->fontSize*scale);
 	fonsSetSpacing(ctx->fontContext->fs, state->letterSpacing*scale);
 	fonsSetBlur(ctx->fontContext->fs, state->fontBlur*scale);
 	fonsSetAlign(ctx->fontContext->fs, state->textAlign);
 	fonsSetFont(ctx->fontContext->fs, state->fontId);
 
 	fonsTextIterInit(ctx->fontContext->fs, &iter, x*scale, y*scale, string, end, FONS_GLYPH_BITMAP_OPTIONAL);
 	prevIter = iter;
 	while (fonsTextIterNext(ctx->fontContext->fs, &iter, &q)) {
 		if (iter.prevGlyphIndex < 0 && nvg__allocTextAtlas(ctx)) { // can not retrieve glyph?
 			iter = prevIter;
 			fonsTextIterNext(ctx->fontContext->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,
 	NVG_CJK_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->fontContext->fs, state->fontSize*scale);
 	fonsSetSpacing(ctx->fontContext->fs, state->letterSpacing*scale);
 	fonsSetBlur(ctx->fontContext->fs, state->fontBlur*scale);
 	fonsSetAlign(ctx->fontContext->fs, state->textAlign);
 	fonsSetFont(ctx->fontContext->fs, state->fontId);
 
 	breakRowWidth *= scale;
 
 	fonsTextIterInit(ctx->fontContext->fs, &iter, 0, 0, string, end, FONS_GLYPH_BITMAP_OPTIONAL);
 	prevIter = iter;
 	while (fonsTextIterNext(ctx->fontContext->fs, &iter, &q)) {
 		if (iter.prevGlyphIndex < 0 && nvg__allocTextAtlas(ctx)) { // can not retrieve glyph?
 			iter = prevIter;
 			fonsTextIterNext(ctx->fontContext->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:
 				if ((iter.codepoint >= 0x4E00 && iter.codepoint <= 0x9FFF) ||
 					(iter.codepoint >= 0x3000 && iter.codepoint <= 0x30FF) ||
 					(iter.codepoint >= 0xFF00 && iter.codepoint <= 0xFFEF) ||
 					(iter.codepoint >= 0x1100 && iter.codepoint <= 0x11FF) ||
 					(iter.codepoint >= 0x3130 && iter.codepoint <= 0x318F) ||
 					(iter.codepoint >= 0xAC00 && iter.codepoint <= 0xD7AF))
 					type = NVG_CJK_CHAR;
 				else
 					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 || type == NVG_CJK_CHAR || type == NVG_SKIPPED_CHAR) {
 					// The current char is the row so far
 					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;
 					// 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 || type == NVG_CJK_CHAR || type == NVG_SKIPPED_CHAR) {
 					rowEnd = iter.next;
 					rowWidth = iter.nextx - rowStartX;
 					rowMaxX = q.x1 - rowStartX;
 				}
 				// track last end of a word
 				if (((ptype == NVG_CHAR || ptype == NVG_CJK_CHAR) && type == NVG_SPACE) || type == NVG_CJK_CHAR) {
 					breakEnd = iter.str;
 					breakWidth = rowWidth;
 					breakMaxX = rowMaxX;
 				}
 				// track last beginning of a word
 				if ((ptype == NVG_SPACE && (type == NVG_CHAR || type == NVG_CJK_CHAR)) || type == NVG_CJK_CHAR) {
 					wordStart = iter.str;
 					wordStartX = iter.x;
 					wordMinX = q.x0;
 				}
 
 				// Break to new line when a character is beyond break width.
 				if ((type == NVG_CHAR || type == NVG_CJK_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;
 						// Update row
 						rowStartX = wordStartX;
 						rowStart = wordStart;
 						rowEnd = iter.next;
 						rowWidth = iter.nextx - rowStartX;
 						rowMinX = wordMinX - rowStartX;
 						rowMaxX = q.x1 - rowStartX;
 					}
 					// 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->fontContext->fs, state->fontSize*scale);
 	fonsSetSpacing(ctx->fontContext->fs, state->letterSpacing*scale);
 	fonsSetBlur(ctx->fontContext->fs, state->fontBlur*scale);
 	fonsSetAlign(ctx->fontContext->fs, state->textAlign);
 	fonsSetFont(ctx->fontContext->fs, state->fontId);
 
 	width = fonsTextBounds(ctx->fontContext->fs, x*scale, y*scale, string, end, bounds);
 	if (bounds != NULL) {
 		// Use line bounds for height.
 		fonsLineBounds(ctx->fontContext->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->fontContext->fs, state->fontSize*scale);
 	fonsSetSpacing(ctx->fontContext->fs, state->letterSpacing*scale);
 	fonsSetBlur(ctx->fontContext->fs, state->fontBlur*scale);
 	fonsSetAlign(ctx->fontContext->fs, state->textAlign);
 	fonsSetFont(ctx->fontContext->fs, state->fontId);
 	fonsLineBounds(ctx->fontContext->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->fontContext->fs, state->fontSize*scale);
 	fonsSetSpacing(ctx->fontContext->fs, state->letterSpacing*scale);
 	fonsSetBlur(ctx->fontContext->fs, state->fontBlur*scale);
 	fonsSetAlign(ctx->fontContext->fs, state->textAlign);
 	fonsSetFont(ctx->fontContext->fs, state->fontId);
 
 	fonsVertMetrics(ctx->fontContext->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