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Diffstat (limited to 'libs/nanovg/src/nanovg.c')
| -rw-r--r-- | libs/nanovg/src/nanovg.c | 2947 |
1 files changed, 2947 insertions, 0 deletions
diff --git a/libs/nanovg/src/nanovg.c b/libs/nanovg/src/nanovg.c new file mode 100644 index 0000000..4119d0d --- /dev/null +++ b/libs/nanovg/src/nanovg.c @@ -0,0 +1,2947 @@ +// +// 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" + +#ifndef NVG_NO_STB +#define STB_IMAGE_IMPLEMENTATION +#include "stb_image.h" +#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 + +#ifndef NVG_MAX_STATES +#define NVG_MAX_STATES 32 +#endif + +#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]; + ctx->fontImages[ctx->fontImageIdx] = 0; + 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; + int image = ctx->fontImages[i]; + ctx->fontImages[i] = 0; + nvgImageSize(ctx, image, &nw, &nh); + if (nw < iw || nh < ih) + nvgDeleteImage(ctx, image); + else + ctx->fontImages[j++] = image; + } + } + // make current font image to first + ctx->fontImages[j] = ctx->fontImages[0]; + ctx->fontImages[0] = fontImage; + ctx->fontImageIdx = 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); +} + +#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, 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 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* filename) +{ + return fonsAddFont(ctx->fs, name, filename, 0); +} + +int nvgCreateFontAtIndex(NVGcontext* ctx, const char* name, const char* filename, const int fontIndex) +{ + return fonsAddFont(ctx->fs, name, filename, fontIndex); +} + +int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData) +{ + return fonsAddFontMem(ctx->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->fs, name, data, ndata, freeData, fontIndex); +} + +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)); +} + +void nvgResetFallbackFontsId(NVGcontext* ctx, int baseFont) +{ + fonsResetFallbackFont(ctx->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->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->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->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; + 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) { + 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; + 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; + } + + // 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->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 |