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-rw-r--r--src/nanovg.c2906
1 files changed, 2906 insertions, 0 deletions
diff --git a/src/nanovg.c b/src/nanovg.c
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+++ b/src/nanovg.c
@@ -0,0 +1,2906 @@
+//
+// 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
+#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 {
+ NVGcompositeOperationState compositeOperation;
+ int shapeAntiAlias;
+ 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;
+}
+
+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)
+{
+ 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, 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->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 = {{{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->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 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->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;
+}
+
+// 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 alpha
+ fillPaint.innerColor.a *= state->alpha;
+ fillPaint.outerColor.a *= state->alpha;
+
+ 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 alpha
+ strokePaint.innerColor.a *= state->alpha;
+ strokePaint.outerColor.a *= state->alpha;
+
+ 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* 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);
+}
+
+
+int nvgAddFallbackFontId(NVGcontext* ctx, int baseFont, int fallbackFont)
+{
+ if(baseFont == -1 || fallbackFont == -1) return 0;
+ return fonsAddFallbackFont(ctx->fs, baseFont, fallbackFont);
+}
+
+int nvgAddFallbackFont(NVGcontext* ctx, const char* baseFont, const char* fallbackFont)
+{
+ return nvgAddFallbackFontId(ctx, nvgFindFont(ctx, baseFont), nvgFindFont(ctx, fallbackFont));
+}
+
+// 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->compositeOperation, &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, FONS_GLYPH_BITMAP_REQUIRED);
+ prevIter = iter;
+ while (fonsTextIterNext(ctx->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->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.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->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, FONS_GLYPH_BITMAP_OPTIONAL);
+ 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,
+ 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->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, FONS_GLYPH_BITMAP_OPTIONAL);
+ 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:
+ 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) {
+ // 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 || type == NVG_CJK_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 - rowStartX;
+ }
+
+ // 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;
+ 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