| /* |
| * 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 "GrFontScaler.h" |
| #include "GrGpu.h" |
| #include "GrIndexBuffer.h" |
| #include "GrStrokeInfo.h" |
| #include "GrTexturePriv.h" |
| #include "GrTextStrike.h" |
| #include "GrTextStrike_impl.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; |
| |
| namespace { |
| // position + texture coord |
| extern const GrVertexAttrib gTextVertexAttribs[] = { |
| {kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding}, |
| {kVec2f_GrVertexAttribType, sizeof(SkPoint) , kGeometryProcessor_GrVertexAttribBinding} |
| }; |
| |
| static const size_t kTextVASize = 2 * sizeof(SkPoint); |
| |
| // position + color + texture coord |
| extern const GrVertexAttrib gTextVertexWithColorAttribs[] = { |
| {kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding}, |
| {kVec4ub_GrVertexAttribType, sizeof(SkPoint), kColor_GrVertexAttribBinding}, |
| {kVec2f_GrVertexAttribType, sizeof(SkPoint) + sizeof(GrColor), kGeometryProcessor_GrVertexAttribBinding} |
| }; |
| |
| static const size_t kTextVAColorSize = 2 * sizeof(SkPoint) + sizeof(GrColor); |
| |
| 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_DISTANCEFIELD_FONTS |
| 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() { |
| this->finish(); |
| SkSafeSetNull(fGammaTexture); |
| } |
| |
| bool GrDistanceFieldTextContext::canDraw(const SkPaint& paint) { |
| 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, fContext->getMatrix())) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| inline void GrDistanceFieldTextContext::init(const GrPaint& paint, const SkPaint& skPaint) { |
| GrTextContext::init(paint, skPaint); |
| |
| fStrike = NULL; |
| |
| const SkMatrix& ctm = fContext->getMatrix(); |
| |
| // 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, 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 char text[], size_t byteLength, |
| SkScalar x, SkScalar y) { |
| SkASSERT(byteLength == 0 || text != NULL); |
| |
| // nothing to draw |
| if (text == NULL || byteLength == 0) { |
| return; |
| } |
| |
| 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, text, byteLength, positions.begin(), 2, offset); |
| } |
| |
| void GrDistanceFieldTextContext::onDrawPosText(const GrPaint& paint, const SkPaint& skPaint, |
| 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; |
| } |
| |
| 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(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(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, 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 void* alloc_vertices(GrDrawTarget* drawTarget, int numVertices, bool useColorVerts) { |
| if (numVertices <= 0) { |
| return NULL; |
| } |
| |
| // set up attributes |
| if (useColorVerts) { |
| drawTarget->drawState()->setVertexAttribs<gTextVertexWithColorAttribs>( |
| SK_ARRAY_COUNT(gTextVertexWithColorAttribs), kTextVAColorSize); |
| } else { |
| drawTarget->drawState()->setVertexAttribs<gTextVertexAttribs>( |
| SK_ARRAY_COUNT(gTextVertexAttribs), kTextVASize); |
| } |
| void* vertices = NULL; |
| bool success = drawTarget->reserveVertexAndIndexSpace(numVertices, |
| 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 = fContext->getMatrix(); |
| |
| // 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) { |
| if (fUseLCDText) { |
| GrColor colorNoPreMul = skcolor_to_grcolor_nopremultiply(filteredColor); |
| fCachedGeometryProcessor.reset(GrDistanceFieldLCDTextureEffect::Create(fCurrTexture, |
| params, |
| fGammaTexture, |
| gammaParams, |
| colorNoPreMul, |
| flags)); |
| } else { |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| U8CPU lum = SkColorSpaceLuminance::computeLuminance(fDeviceProperties.gamma(), |
| filteredColor); |
| fCachedGeometryProcessor.reset(GrDistanceFieldTextureEffect::Create(fCurrTexture, |
| params, |
| fGammaTexture, |
| gammaParams, |
| lum/255.f, |
| flags)); |
| #else |
| fCachedGeometryProcessor.reset(GrDistanceFieldNoGammaTextureEffect::Create(fCurrTexture, |
| params, flags)); |
| #endif |
| } |
| fEffectTextureUniqueID = textureUniqueID; |
| fEffectColor = filteredColor; |
| fEffectFlags = flags; |
| } |
| |
| } |
| |
| // 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 = fContext->getMatrix(); |
| (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) { |
| if (!fStrike->glyphTooLargeForAtlas(glyph)) { |
| if (fStrike->addGlyphToAtlas(glyph, scaler)) { |
| goto HAS_ATLAS; |
| } |
| |
| // try to clear out an unused plot before we flush |
| if (fContext->getFontCache()->freeUnusedPlot(fStrike, glyph) && |
| fStrike->addGlyphToAtlas(glyph, scaler)) { |
| goto HAS_ATLAS; |
| } |
| |
| 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)) { |
| goto HAS_ATLAS; |
| } |
| } |
| |
| 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(); |
| |
| GrContext::AutoMatrix am; |
| SkMatrix ctm; |
| ctm.setScale(fTextRatio, fTextRatio); |
| ctm.postTranslate(sx - dx, sy - dy); |
| GrPaint tmpPaint(fPaint); |
| am.setPreConcat(fContext, ctm, &tmpPaint); |
| GrStrokeInfo strokeInfo(SkStrokeRec::kFill_InitStyle); |
| fContext->drawPath(tmpPaint, *glyph->fPath, strokeInfo); |
| |
| // remove this glyph from the vertices we need to allocate |
| fTotalVertexCount -= kVerticesPerGlyph; |
| return true; |
| } |
| |
| HAS_ATLAS: |
| 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 = fUseLCDText ? (2 * sizeof(SkPoint)) |
| : (2 * sizeof(SkPoint) + sizeof(GrColor)); |
| |
| SkASSERT(vertSize == fDrawTarget->getDrawState().getVertexStride()); |
| |
| 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) { |
| if (0xFF == GrColorUnpackA(fPaint.getColor())) { |
| fDrawTarget->drawState()->setHint(GrDrawState::kVertexColorsAreOpaque_Hint, true); |
| } |
| // 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; |
| } |
| |
| GrDrawState* drawState = fDrawTarget->drawState(); |
| GrDrawState::AutoRestoreEffects are(drawState); |
| |
| drawState->setFromPaint(fPaint, fContext->getMatrix(), fContext->getRenderTarget()); |
| |
| if (fCurrVertex > 0) { |
| // 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); |
| |
| // Effects could be stored with one of the cache objects (atlas?) |
| drawState->setGeometryProcessor(fCachedGeometryProcessor.get()); |
| |
| // Set draw state |
| if (fUseLCDText) { |
| GrColor colorNoPreMul = skcolor_to_grcolor_nopremultiply(filteredColor); |
| if (kOne_GrBlendCoeff != fPaint.getSrcBlendCoeff() || |
| kISA_GrBlendCoeff != fPaint.getDstBlendCoeff() || |
| fPaint.numColorStages()) { |
| SkDebugf("LCD Text will not draw correctly.\n"); |
| } |
| SkASSERT(!drawState->hasColorVertexAttribute()); |
| // We don't use the GrPaint's color in this case because it's been premultiplied by |
| // alpha. Instead we feed in a non-premultiplied color, and multiply its alpha by |
| // the mask texture color. The end result is that we get |
| // mask*paintAlpha*paintColor + (1-mask*paintAlpha)*dstColor |
| int a = SkColorGetA(fSkPaint.getColor()); |
| // paintAlpha |
| drawState->setColor(SkColorSetARGB(a, a, a, a)); |
| // paintColor |
| drawState->setBlendConstant(colorNoPreMul); |
| drawState->setBlendFunc(kConstC_GrBlendCoeff, kISC_GrBlendCoeff); |
| } else { |
| // set back to normal in case we took LCD path previously. |
| drawState->setBlendFunc(fPaint.getSrcBlendCoeff(), fPaint.getDstBlendCoeff()); |
| // We're using per-vertex color. |
| SkASSERT(drawState->hasColorVertexAttribute()); |
| } |
| int nGlyphs = fCurrVertex / kVerticesPerGlyph; |
| fDrawTarget->setIndexSourceToBuffer(fContext->getQuadIndexBuffer()); |
| fDrawTarget->drawIndexedInstances(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(); |
| } |
| |
