| /* | |
| * Copyright 2013 Google Inc. | |
| * | |
| * Use of this source code is governed by a BSD-style license that can be | |
| * found in the LICENSE file. | |
| */ | |
| #include "GrDistanceFieldTextContext.h" | |
| #include "GrAtlas.h" | |
| #include "GrBitmapTextContext.h" | |
| #include "GrDrawTarget.h" | |
| #include "GrDrawTargetCaps.h" | |
| #include "GrFontCache.h" | |
| #include "GrFontScaler.h" | |
| #include "GrGpu.h" | |
| #include "GrIndexBuffer.h" | |
| #include "GrStrokeInfo.h" | |
| #include "GrTexturePriv.h" | |
| #include "SkAutoKern.h" | |
| #include "SkColorFilter.h" | |
| #include "SkDistanceFieldGen.h" | |
| #include "SkDraw.h" | |
| #include "SkGlyphCache.h" | |
| #include "SkGpuDevice.h" | |
| #include "SkPath.h" | |
| #include "SkRTConf.h" | |
| #include "SkStrokeRec.h" | |
| #include "effects/GrDistanceFieldTextureEffect.h" | |
| SK_CONF_DECLARE(bool, c_DumpFontCache, "gpu.dumpFontCache", false, | |
| "Dump the contents of the font cache before every purge."); | |
| static const int kSmallDFFontSize = 32; | |
| static const int kSmallDFFontLimit = 32; | |
| static const int kMediumDFFontSize = 78; | |
| static const int kMediumDFFontLimit = 78; | |
| static const int kLargeDFFontSize = 192; | |
| static const int kVerticesPerGlyph = 4; | |
| static const int kIndicesPerGlyph = 6; | |
| GrDistanceFieldTextContext::GrDistanceFieldTextContext(GrContext* context, | |
| const SkDeviceProperties& properties, | |
| bool enable) | |
| : GrTextContext(context, properties) { | |
| #if SK_FORCE_DISTANCE_FIELD_TEXT | |
| fEnableDFRendering = true; | |
| #else | |
| fEnableDFRendering = enable; | |
| #endif | |
| fStrike = NULL; | |
| fGammaTexture = NULL; | |
| fEffectTextureUniqueID = SK_InvalidUniqueID; | |
| fEffectColor = GrColor_ILLEGAL; | |
| fEffectFlags = kInvalid_DistanceFieldEffectFlag; | |
| fVertices = NULL; | |
| fCurrVertex = 0; | |
| fAllocVertexCount = 0; | |
| fTotalVertexCount = 0; | |
| fCurrTexture = NULL; | |
| fVertexBounds.setLargestInverted(); | |
| } | |
| GrDistanceFieldTextContext* GrDistanceFieldTextContext::Create(GrContext* context, | |
| const SkDeviceProperties& props, | |
| bool enable) { | |
| GrDistanceFieldTextContext* textContext = SkNEW_ARGS(GrDistanceFieldTextContext, | |
| (context, props, enable)); | |
| textContext->fFallbackTextContext = GrBitmapTextContext::Create(context, props); | |
| return textContext; | |
| } | |
| GrDistanceFieldTextContext::~GrDistanceFieldTextContext() { | |
| SkSafeSetNull(fGammaTexture); | |
| } | |
| bool GrDistanceFieldTextContext::canDraw(const SkPaint& paint, const SkMatrix& viewMatrix) { | |
| if (!fEnableDFRendering && !paint.isDistanceFieldTextTEMP()) { | |
| return false; | |
| } | |
| // rasterizers and mask filters modify alpha, which doesn't | |
| // translate well to distance | |
| if (paint.getRasterizer() || paint.getMaskFilter() || | |
| !fContext->getTextTarget()->caps()->shaderDerivativeSupport()) { | |
| return false; | |
| } | |
| // TODO: add some stroking support | |
| if (paint.getStyle() != SkPaint::kFill_Style) { | |
| return false; | |
| } | |
| // TODO: choose an appropriate maximum scale for distance fields and | |
| // enable perspective | |
| if (SkDraw::ShouldDrawTextAsPaths(paint, viewMatrix)) { | |
| return false; | |
| } | |
| return true; | |
| } | |
| inline void GrDistanceFieldTextContext::init(const GrPaint& paint, const SkPaint& skPaint) { | |
| GrTextContext::init(paint, skPaint); | |
| fStrike = NULL; | |
| const SkMatrix& ctm = fViewMatrix; | |
| // getMaxScale doesn't support perspective, so neither do we at the moment | |
| SkASSERT(!ctm.hasPerspective()); | |
| SkScalar maxScale = ctm.getMaxScale(); | |
| SkScalar textSize = fSkPaint.getTextSize(); | |
| SkScalar scaledTextSize = textSize; | |
| // if we have non-unity scale, we need to choose our base text size | |
| // based on the SkPaint's text size multiplied by the max scale factor | |
| // TODO: do we need to do this if we're scaling down (i.e. maxScale < 1)? | |
| if (maxScale > 0 && !SkScalarNearlyEqual(maxScale, SK_Scalar1)) { | |
| scaledTextSize *= maxScale; | |
| } | |
| fVertices = NULL; | |
| fCurrVertex = 0; | |
| fAllocVertexCount = 0; | |
| fTotalVertexCount = 0; | |
| if (scaledTextSize <= kSmallDFFontLimit) { | |
| fTextRatio = textSize / kSmallDFFontSize; | |
| fSkPaint.setTextSize(SkIntToScalar(kSmallDFFontSize)); | |
| #if DEBUG_TEXT_SIZE | |
| fSkPaint.setColor(SkColorSetARGB(0xFF, 0x00, 0x00, 0xFF)); | |
| fPaint.setColor(GrColorPackRGBA(0x00, 0x00, 0xFF, 0xFF)); | |
| #endif | |
| } else if (scaledTextSize <= kMediumDFFontLimit) { | |
| fTextRatio = textSize / kMediumDFFontSize; | |
| fSkPaint.setTextSize(SkIntToScalar(kMediumDFFontSize)); | |
| #if DEBUG_TEXT_SIZE | |
| fSkPaint.setColor(SkColorSetARGB(0xFF, 0x00, 0xFF, 0x00)); | |
| fPaint.setColor(GrColorPackRGBA(0x00, 0xFF, 0x00, 0xFF)); | |
| #endif | |
| } else { | |
| fTextRatio = textSize / kLargeDFFontSize; | |
| fSkPaint.setTextSize(SkIntToScalar(kLargeDFFontSize)); | |
| #if DEBUG_TEXT_SIZE | |
| fSkPaint.setColor(SkColorSetARGB(0xFF, 0xFF, 0x00, 0x00)); | |
| fPaint.setColor(GrColorPackRGBA(0xFF, 0x00, 0x00, 0xFF)); | |
| #endif | |
| } | |
| fUseLCDText = fSkPaint.isLCDRenderText(); | |
| fSkPaint.setLCDRenderText(false); | |
| fSkPaint.setAutohinted(false); | |
| fSkPaint.setHinting(SkPaint::kNormal_Hinting); | |
| fSkPaint.setSubpixelText(true); | |
| } | |
| static void setup_gamma_texture(GrContext* context, const SkGlyphCache* cache, | |
| const SkDeviceProperties& deviceProperties, | |
| GrTexture** gammaTexture) { | |
| if (NULL == *gammaTexture) { | |
| int width, height; | |
| size_t size; | |
| #ifdef SK_GAMMA_CONTRAST | |
| SkScalar contrast = SK_GAMMA_CONTRAST; | |
| #else | |
| SkScalar contrast = 0.5f; | |
| #endif | |
| SkScalar paintGamma = deviceProperties.gamma(); | |
| SkScalar deviceGamma = deviceProperties.gamma(); | |
| size = SkScalerContext::GetGammaLUTSize(contrast, paintGamma, deviceGamma, | |
| &width, &height); | |
| SkAutoTArray<uint8_t> data((int)size); | |
| SkScalerContext::GetGammaLUTData(contrast, paintGamma, deviceGamma, data.get()); | |
| // TODO: Update this to use the cache rather than directly creating a texture. | |
| GrSurfaceDesc desc; | |
| desc.fFlags = kNone_GrSurfaceFlags; | |
| desc.fWidth = width; | |
| desc.fHeight = height; | |
| desc.fConfig = kAlpha_8_GrPixelConfig; | |
| *gammaTexture = context->getGpu()->createTexture(desc, true, NULL, 0); | |
| if (NULL == *gammaTexture) { | |
| return; | |
| } | |
| (*gammaTexture)->writePixels(0, 0, width, height, | |
| (*gammaTexture)->config(), data.get(), 0, | |
| GrContext::kDontFlush_PixelOpsFlag); | |
| } | |
| } | |
| void GrDistanceFieldTextContext::onDrawText(const GrPaint& paint, const SkPaint& skPaint, | |
| const SkMatrix& viewMatrix, | |
| const char text[], size_t byteLength, | |
| SkScalar x, SkScalar y) { | |
| SkASSERT(byteLength == 0 || text != NULL); | |
| // nothing to draw | |
| if (text == NULL || byteLength == 0) { | |
| return; | |
| } | |
| fViewMatrix = viewMatrix; | |
| SkDrawCacheProc glyphCacheProc = skPaint.getDrawCacheProc(); | |
| SkAutoGlyphCache autoCache(skPaint, &fDeviceProperties, NULL); | |
| SkGlyphCache* cache = autoCache.getCache(); | |
| SkTArray<SkScalar> positions; | |
| const char* textPtr = text; | |
| SkFixed stopX = 0; | |
| SkFixed stopY = 0; | |
| SkFixed origin; | |
| switch (skPaint.getTextAlign()) { | |
| case SkPaint::kRight_Align: origin = SK_Fixed1; break; | |
| case SkPaint::kCenter_Align: origin = SK_FixedHalf; break; | |
| case SkPaint::kLeft_Align: origin = 0; break; | |
| default: SkFAIL("Invalid paint origin"); return; | |
| } | |
| SkAutoKern autokern; | |
| const char* stop = text + byteLength; | |
| while (textPtr < stop) { | |
| // don't need x, y here, since all subpixel variants will have the | |
| // same advance | |
| const SkGlyph& glyph = glyphCacheProc(cache, &textPtr, 0, 0); | |
| SkFixed width = glyph.fAdvanceX + autokern.adjust(glyph); | |
| positions.push_back(SkFixedToScalar(stopX + SkFixedMul_portable(origin, width))); | |
| SkFixed height = glyph.fAdvanceY; | |
| positions.push_back(SkFixedToScalar(stopY + SkFixedMul_portable(origin, height))); | |
| stopX += width; | |
| stopY += height; | |
| } | |
| SkASSERT(textPtr == stop); | |
| // now adjust starting point depending on alignment | |
| SkScalar alignX = SkFixedToScalar(stopX); | |
| SkScalar alignY = SkFixedToScalar(stopY); | |
| if (skPaint.getTextAlign() == SkPaint::kCenter_Align) { | |
| alignX = SkScalarHalf(alignX); | |
| alignY = SkScalarHalf(alignY); | |
| } else if (skPaint.getTextAlign() == SkPaint::kLeft_Align) { | |
| alignX = 0; | |
| alignY = 0; | |
| } | |
| x -= alignX; | |
| y -= alignY; | |
| SkPoint offset = SkPoint::Make(x, y); | |
| this->drawPosText(paint, skPaint, viewMatrix, text, byteLength, positions.begin(), 2, offset); | |
| } | |
| void GrDistanceFieldTextContext::onDrawPosText(const GrPaint& paint, const SkPaint& skPaint, | |
| const SkMatrix& viewMatrix, | |
| const char text[], size_t byteLength, | |
| const SkScalar pos[], int scalarsPerPosition, | |
| const SkPoint& offset) { | |
| SkASSERT(byteLength == 0 || text != NULL); | |
| SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition); | |
| // nothing to draw | |
| if (text == NULL || byteLength == 0 /* no raster clip? || fRC->isEmpty()*/) { | |
| return; | |
| } | |
| fViewMatrix = viewMatrix; | |
| this->init(paint, skPaint); | |
| SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc(); | |
| SkAutoGlyphCacheNoGamma autoCache(fSkPaint, &fDeviceProperties, NULL); | |
| SkGlyphCache* cache = autoCache.getCache(); | |
| GrFontScaler* fontScaler = GetGrFontScaler(cache); | |
| setup_gamma_texture(fContext, cache, fDeviceProperties, &fGammaTexture); | |
| int numGlyphs = fSkPaint.textToGlyphs(text, byteLength, NULL); | |
| fTotalVertexCount = kVerticesPerGlyph*numGlyphs; | |
| const char* stop = text + byteLength; | |
| SkTArray<char> fallbackTxt; | |
| SkTArray<SkScalar> fallbackPos; | |
| if (SkPaint::kLeft_Align == fSkPaint.getTextAlign()) { | |
| while (text < stop) { | |
| const char* lastText = text; | |
| // the last 2 parameters are ignored | |
| const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0); | |
| if (glyph.fWidth) { | |
| SkScalar x = offset.x() + pos[0]; | |
| SkScalar y = offset.y() + (2 == scalarsPerPosition ? pos[1] : 0); | |
| if (!this->appendGlyph(GrGlyph::Pack(glyph.getGlyphID(), | |
| glyph.getSubXFixed(), | |
| glyph.getSubYFixed()), | |
| x, y, fontScaler)) { | |
| // couldn't append, send to fallback | |
| fallbackTxt.push_back_n(SkToInt(text-lastText), lastText); | |
| fallbackPos.push_back(pos[0]); | |
| if (2 == scalarsPerPosition) { | |
| fallbackPos.push_back(pos[1]); | |
| } | |
| } | |
| } | |
| pos += scalarsPerPosition; | |
| } | |
| } else { | |
| SkScalar alignMul = SkPaint::kCenter_Align == fSkPaint.getTextAlign() ? SK_ScalarHalf | |
| : SK_Scalar1; | |
| while (text < stop) { | |
| const char* lastText = text; | |
| // the last 2 parameters are ignored | |
| const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0); | |
| if (glyph.fWidth) { | |
| SkScalar x = offset.x() + pos[0]; | |
| SkScalar y = offset.y() + (2 == scalarsPerPosition ? pos[1] : 0); | |
| SkScalar advanceX = SkFixedToScalar(glyph.fAdvanceX)*alignMul*fTextRatio; | |
| SkScalar advanceY = SkFixedToScalar(glyph.fAdvanceY)*alignMul*fTextRatio; | |
| if (!this->appendGlyph(GrGlyph::Pack(glyph.getGlyphID(), | |
| glyph.getSubXFixed(), | |
| glyph.getSubYFixed()), | |
| x - advanceX, y - advanceY, fontScaler)) { | |
| // couldn't append, send to fallback | |
| fallbackTxt.push_back_n(SkToInt(text-lastText), lastText); | |
| fallbackPos.push_back(pos[0]); | |
| if (2 == scalarsPerPosition) { | |
| fallbackPos.push_back(pos[1]); | |
| } | |
| } | |
| } | |
| pos += scalarsPerPosition; | |
| } | |
| } | |
| this->finish(); | |
| if (fallbackTxt.count() > 0) { | |
| fFallbackTextContext->drawPosText(paint, skPaint, viewMatrix, fallbackTxt.begin(), | |
| fallbackTxt.count(), fallbackPos.begin(), | |
| scalarsPerPosition, offset); | |
| } | |
| } | |
| static inline GrColor skcolor_to_grcolor_nopremultiply(SkColor c) { | |
| unsigned r = SkColorGetR(c); | |
| unsigned g = SkColorGetG(c); | |
| unsigned b = SkColorGetB(c); | |
| return GrColorPackRGBA(r, g, b, 0xff); | |
| } | |
| static size_t get_vertex_stride(bool useColorVerts) { | |
| return useColorVerts ? (2 * sizeof(SkPoint) + sizeof(GrColor)) : | |
| (2 * sizeof(SkPoint)); | |
| } | |
| static void* alloc_vertices(GrDrawTarget* drawTarget, | |
| int numVertices, | |
| bool useColorVerts) { | |
| if (numVertices <= 0) { | |
| return NULL; | |
| } | |
| void* vertices = NULL; | |
| bool success = drawTarget->reserveVertexAndIndexSpace(numVertices, | |
| get_vertex_stride(useColorVerts), | |
| 0, | |
| &vertices, | |
| NULL); | |
| GrAlwaysAssert(success); | |
| return vertices; | |
| } | |
| void GrDistanceFieldTextContext::setupCoverageEffect(const SkColor& filteredColor) { | |
| GrTextureParams params(SkShader::kRepeat_TileMode, GrTextureParams::kBilerp_FilterMode); | |
| GrTextureParams gammaParams(SkShader::kClamp_TileMode, GrTextureParams::kNone_FilterMode); | |
| uint32_t textureUniqueID = fCurrTexture->getUniqueID(); | |
| const SkMatrix& ctm = fViewMatrix; | |
| // set up any flags | |
| uint32_t flags = 0; | |
| flags |= ctm.isSimilarity() ? kSimilarity_DistanceFieldEffectFlag : 0; | |
| flags |= fUseLCDText ? kUseLCD_DistanceFieldEffectFlag : 0; | |
| flags |= fUseLCDText && ctm.rectStaysRect() ? | |
| kRectToRect_DistanceFieldEffectFlag : 0; | |
| bool useBGR = SkPixelGeometryIsBGR(fDeviceProperties.pixelGeometry()); | |
| flags |= fUseLCDText && useBGR ? kBGR_DistanceFieldEffectFlag : 0; | |
| // see if we need to create a new effect | |
| if (textureUniqueID != fEffectTextureUniqueID || | |
| filteredColor != fEffectColor || | |
| flags != fEffectFlags || | |
| !fCachedGeometryProcessor->viewMatrix().cheapEqualTo(fViewMatrix)) { | |
| GrColor color = fPaint.getColor(); | |
| if (fUseLCDText) { | |
| GrColor colorNoPreMul = skcolor_to_grcolor_nopremultiply(filteredColor); | |
| fCachedGeometryProcessor.reset(GrDistanceFieldLCDTextureEffect::Create(color, | |
| fViewMatrix, | |
| fCurrTexture, | |
| params, | |
| fGammaTexture, | |
| gammaParams, | |
| colorNoPreMul, | |
| flags)); | |
| } else { | |
| flags |= kColorAttr_DistanceFieldEffectFlag; | |
| bool opaque = GrColorIsOpaque(color); | |
| #ifdef SK_GAMMA_APPLY_TO_A8 | |
| U8CPU lum = SkColorSpaceLuminance::computeLuminance(fDeviceProperties.gamma(), | |
| filteredColor); | |
| fCachedGeometryProcessor.reset(GrDistanceFieldTextureEffect::Create(color, | |
| fViewMatrix, | |
| fCurrTexture, | |
| params, | |
| fGammaTexture, | |
| gammaParams, | |
| lum/255.f, | |
| flags, | |
| opaque)); | |
| #else | |
| fCachedGeometryProcessor.reset(GrDistanceFieldNoGammaTextureEffect::Create(color, | |
| fViewMatrix, | |
| fCurrTexture, | |
| params, | |
| flags, | |
| opaque)); | |
| #endif | |
| } | |
| fEffectTextureUniqueID = textureUniqueID; | |
| fEffectColor = filteredColor; | |
| fEffectFlags = flags; | |
| } | |
| } | |
| inline bool GrDistanceFieldTextContext::uploadGlyph(GrGlyph* glyph, GrFontScaler* scaler) { | |
| if (!fStrike->glyphTooLargeForAtlas(glyph)) { | |
| if (fStrike->addGlyphToAtlas(glyph, scaler)) { | |
| return true; | |
| } | |
| // try to clear out an unused plot before we flush | |
| if (fContext->getFontCache()->freeUnusedPlot(fStrike, glyph) && | |
| fStrike->addGlyphToAtlas(glyph, scaler)) { | |
| return true; | |
| } | |
| if (c_DumpFontCache) { | |
| #ifdef SK_DEVELOPER | |
| fContext->getFontCache()->dump(); | |
| #endif | |
| } | |
| // before we purge the cache, we must flush any accumulated draws | |
| this->flush(); | |
| fContext->flush(); | |
| // we should have an unused plot now | |
| if (fContext->getFontCache()->freeUnusedPlot(fStrike, glyph) && | |
| fStrike->addGlyphToAtlas(glyph, scaler)) { | |
| return true; | |
| } | |
| // we should never get here | |
| SkASSERT(false); | |
| } | |
| return false; | |
| } | |
| // Returns true if this method handled the glyph, false if needs to be passed to fallback | |
| // | |
| bool GrDistanceFieldTextContext::appendGlyph(GrGlyph::PackedID packed, | |
| SkScalar sx, SkScalar sy, | |
| GrFontScaler* scaler) { | |
| if (NULL == fDrawTarget) { | |
| return true; | |
| } | |
| if (NULL == fStrike) { | |
| fStrike = fContext->getFontCache()->getStrike(scaler, true); | |
| } | |
| GrGlyph* glyph = fStrike->getGlyph(packed, scaler); | |
| if (NULL == glyph || glyph->fBounds.isEmpty()) { | |
| return true; | |
| } | |
| // fallback to color glyph support | |
| if (kA8_GrMaskFormat != glyph->fMaskFormat) { | |
| return false; | |
| } | |
| SkScalar dx = SkIntToScalar(glyph->fBounds.fLeft + SK_DistanceFieldInset); | |
| SkScalar dy = SkIntToScalar(glyph->fBounds.fTop + SK_DistanceFieldInset); | |
| SkScalar width = SkIntToScalar(glyph->fBounds.width() - 2*SK_DistanceFieldInset); | |
| SkScalar height = SkIntToScalar(glyph->fBounds.height() - 2*SK_DistanceFieldInset); | |
| SkScalar scale = fTextRatio; | |
| dx *= scale; | |
| dy *= scale; | |
| sx += dx; | |
| sy += dy; | |
| width *= scale; | |
| height *= scale; | |
| SkRect glyphRect = SkRect::MakeXYWH(sx, sy, width, height); | |
| // check if we clipped out | |
| SkRect dstRect; | |
| const SkMatrix& ctm = fViewMatrix; | |
| (void) ctm.mapRect(&dstRect, glyphRect); | |
| if (fClipRect.quickReject(SkScalarTruncToInt(dstRect.left()), | |
| SkScalarTruncToInt(dstRect.top()), | |
| SkScalarTruncToInt(dstRect.right()), | |
| SkScalarTruncToInt(dstRect.bottom()))) { | |
| // SkCLZ(3); // so we can set a break-point in the debugger | |
| return true; | |
| } | |
| if (NULL == glyph->fPlot) { | |
| // needs to be a separate conditional to avoid over-optimization | |
| // on Nexus 7 and Nexus 10 | |
| // If the glyph is too large we fall back to paths | |
| if (!uploadGlyph(glyph, scaler)) { | |
| if (NULL == glyph->fPath) { | |
| SkPath* path = SkNEW(SkPath); | |
| if (!scaler->getGlyphPath(glyph->glyphID(), path)) { | |
| // flag the glyph as being dead? | |
| delete path; | |
| return true; | |
| } | |
| glyph->fPath = path; | |
| } | |
| // flush any accumulated draws before drawing this glyph as a path. | |
| this->flush(); | |
| SkMatrix ctm; | |
| ctm.setScale(fTextRatio, fTextRatio); | |
| ctm.postTranslate(sx - dx, sy - dy); | |
| SkPath tmpPath(*glyph->fPath); | |
| tmpPath.transform(ctm); | |
| GrStrokeInfo strokeInfo(SkStrokeRec::kFill_InitStyle); | |
| fContext->drawPath(fPaint, fViewMatrix, tmpPath, strokeInfo); | |
| // remove this glyph from the vertices we need to allocate | |
| fTotalVertexCount -= kVerticesPerGlyph; | |
| return true; | |
| } | |
| } | |
| SkASSERT(glyph->fPlot); | |
| GrDrawTarget::DrawToken drawToken = fDrawTarget->getCurrentDrawToken(); | |
| glyph->fPlot->setDrawToken(drawToken); | |
| GrTexture* texture = glyph->fPlot->texture(); | |
| SkASSERT(texture); | |
| if (fCurrTexture != texture || fCurrVertex + kVerticesPerGlyph > fTotalVertexCount) { | |
| this->flush(); | |
| fCurrTexture = texture; | |
| fCurrTexture->ref(); | |
| } | |
| bool useColorVerts = !fUseLCDText; | |
| if (NULL == fVertices) { | |
| int maxQuadVertices = kVerticesPerGlyph * fContext->getQuadIndexBuffer()->maxQuads(); | |
| fAllocVertexCount = SkMin32(fTotalVertexCount, maxQuadVertices); | |
| fVertices = alloc_vertices(fDrawTarget, | |
| fAllocVertexCount, | |
| useColorVerts); | |
| } | |
| SkFixed tx = SkIntToFixed(glyph->fAtlasLocation.fX + SK_DistanceFieldInset); | |
| SkFixed ty = SkIntToFixed(glyph->fAtlasLocation.fY + SK_DistanceFieldInset); | |
| SkFixed tw = SkIntToFixed(glyph->fBounds.width() - 2*SK_DistanceFieldInset); | |
| SkFixed th = SkIntToFixed(glyph->fBounds.height() - 2*SK_DistanceFieldInset); | |
| fVertexBounds.joinNonEmptyArg(glyphRect); | |
| size_t vertSize = get_vertex_stride(useColorVerts); | |
| SkPoint* positions = reinterpret_cast<SkPoint*>( | |
| reinterpret_cast<intptr_t>(fVertices) + vertSize * fCurrVertex); | |
| positions->setRectFan(glyphRect.fLeft, glyphRect.fTop, glyphRect.fRight, glyphRect.fBottom, | |
| vertSize); | |
| // The texture coords are last in both the with and without color vertex layouts. | |
| SkPoint* textureCoords = reinterpret_cast<SkPoint*>( | |
| reinterpret_cast<intptr_t>(positions) + vertSize - sizeof(SkPoint)); | |
| textureCoords->setRectFan(SkFixedToFloat(texture->texturePriv().normalizeFixedX(tx)), | |
| SkFixedToFloat(texture->texturePriv().normalizeFixedY(ty)), | |
| SkFixedToFloat(texture->texturePriv().normalizeFixedX(tx + tw)), | |
| SkFixedToFloat(texture->texturePriv().normalizeFixedY(ty + th)), | |
| vertSize); | |
| if (useColorVerts) { | |
| // color comes after position. | |
| GrColor* colors = reinterpret_cast<GrColor*>(positions + 1); | |
| for (int i = 0; i < 4; ++i) { | |
| *colors = fPaint.getColor(); | |
| colors = reinterpret_cast<GrColor*>(reinterpret_cast<intptr_t>(colors) + vertSize); | |
| } | |
| } | |
| fCurrVertex += 4; | |
| return true; | |
| } | |
| void GrDistanceFieldTextContext::flush() { | |
| if (NULL == fDrawTarget) { | |
| return; | |
| } | |
| if (fCurrVertex > 0) { | |
| GrDrawState drawState; | |
| drawState.setFromPaint(fPaint, fContext->getRenderTarget()); | |
| // setup our sampler state for our text texture/atlas | |
| SkASSERT(SkIsAlign4(fCurrVertex)); | |
| // get our current color | |
| SkColor filteredColor; | |
| SkColorFilter* colorFilter = fSkPaint.getColorFilter(); | |
| if (colorFilter) { | |
| filteredColor = colorFilter->filterColor(fSkPaint.getColor()); | |
| } else { | |
| filteredColor = fSkPaint.getColor(); | |
| } | |
| this->setupCoverageEffect(filteredColor); | |
| // Set draw state | |
| if (fUseLCDText) { | |
| // TODO: move supportsRGBCoverage check to setupCoverageEffect and only add LCD | |
| // processor if the xp can support it. For now we will simply assume that if | |
| // fUseLCDText is true, then we have a known color output. | |
| if (!drawState.getXPFactory()->supportsRGBCoverage(0, kRGBA_GrColorComponentFlags)) { | |
| SkDebugf("LCD Text will not draw correctly.\n"); | |
| } | |
| SkASSERT(!fCachedGeometryProcessor->hasVertexColor()); | |
| } else { | |
| // We're using per-vertex color. | |
| SkASSERT(fCachedGeometryProcessor->hasVertexColor()); | |
| } | |
| int nGlyphs = fCurrVertex / kVerticesPerGlyph; | |
| fDrawTarget->setIndexSourceToBuffer(fContext->getQuadIndexBuffer()); | |
| fDrawTarget->drawIndexedInstances(&drawState, | |
| fCachedGeometryProcessor.get(), | |
| kTriangles_GrPrimitiveType, | |
| nGlyphs, | |
| kVerticesPerGlyph, | |
| kIndicesPerGlyph, | |
| &fVertexBounds); | |
| fDrawTarget->resetVertexSource(); | |
| fVertices = NULL; | |
| fTotalVertexCount -= fCurrVertex; | |
| fCurrVertex = 0; | |
| SkSafeSetNull(fCurrTexture); | |
| fVertexBounds.setLargestInverted(); | |
| } | |
| } | |
| inline void GrDistanceFieldTextContext::finish() { | |
| this->flush(); | |
| fTotalVertexCount = 0; | |
| GrTextContext::finish(); | |
| } | |