| /* |
| * 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 "GrAtlasTextContext.h" |
| #include "GrBitmapTextContext.h" |
| #include "GrDrawTarget.h" |
| #include "GrDrawTargetCaps.h" |
| #include "GrFontAtlasSizes.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 kMinDFFontSize = 18; |
| static const int kSmallDFFontSize = 32; |
| static const int kSmallDFFontLimit = 32; |
| static const int kMediumDFFontSize = 72; |
| static const int kMediumDFFontLimit = 72; |
| static const int kLargeDFFontSize = 162; |
| |
| static const int kVerticesPerGlyph = 4; |
| static const int kIndicesPerGlyph = 6; |
| |
| #ifdef SK_DEBUG |
| static const int kExpectedDistanceAdjustTableSize = 8; |
| #endif |
| static const int kDistanceAdjustLumShift = 5; |
| |
| GrDistanceFieldTextContext::GrDistanceFieldTextContext(GrContext* context, |
| SkGpuDevice* gpuDevice, |
| const SkDeviceProperties& properties, |
| bool enable) |
| : GrTextContext(context, gpuDevice, properties) { |
| #if SK_FORCE_DISTANCE_FIELD_TEXT |
| fEnableDFRendering = true; |
| #else |
| fEnableDFRendering = enable; |
| #endif |
| fStrike = NULL; |
| fDistanceAdjustTable = 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, |
| SkGpuDevice* gpuDevice, |
| const SkDeviceProperties& props, |
| bool enable) { |
| GrDistanceFieldTextContext* textContext = SkNEW_ARGS(GrDistanceFieldTextContext, |
| (context, gpuDevice, props, enable)); |
| textContext->buildDistanceAdjustTable(); |
| #ifdef USE_BITMAP_TEXTBLOBS |
| textContext->fFallbackTextContext = GrBitmapTextContextB::Create(context, gpuDevice, props); |
| #else |
| textContext->fFallbackTextContext = GrBitmapTextContext::Create(context, gpuDevice, props); |
| #endif |
| |
| return textContext; |
| } |
| |
| void GrDistanceFieldTextContext::buildDistanceAdjustTable() { |
| |
| // This is used for an approximation of the mask gamma hack, used by raster and bitmap |
| // text. The mask gamma hack is based off of guessing what the blend color is going to |
| // be, and adjusting the mask so that when run through the linear blend will |
| // produce the value closest to the desired result. However, in practice this means |
| // that the 'adjusted' mask is just increasing or decreasing the coverage of |
| // the mask depending on what it is thought it will blit against. For black (on |
| // assumed white) this means that coverages are decreased (on a curve). For white (on |
| // assumed black) this means that coverages are increased (on a a curve). At |
| // middle (perceptual) gray (which could be blit against anything) the coverages |
| // remain the same. |
| // |
| // The idea here is that instead of determining the initial (real) coverage and |
| // then adjusting that coverage, we determine an adjusted coverage directly by |
| // essentially manipulating the geometry (in this case, the distance to the glyph |
| // edge). So for black (on assumed white) this thins a bit; for white (on |
| // assumed black) this fake bolds the geometry a bit. |
| // |
| // The distance adjustment is calculated by determining the actual coverage value which |
| // when fed into in the mask gamma table gives us an 'adjusted coverage' value of 0.5. This |
| // actual coverage value (assuming it's between 0 and 1) corresponds to a distance from the |
| // actual edge. So by subtracting this distance adjustment and computing without the |
| // the coverage adjustment we should get 0.5 coverage at the same point. |
| // |
| // This has several implications: |
| // For non-gray lcd smoothed text, each subpixel essentially is using a |
| // slightly different geometry. |
| // |
| // For black (on assumed white) this may not cover some pixels which were |
| // previously covered; however those pixels would have been only slightly |
| // covered and that slight coverage would have been decreased anyway. Also, some pixels |
| // which were previously fully covered may no longer be fully covered. |
| // |
| // For white (on assumed black) this may cover some pixels which weren't |
| // previously covered at all. |
| |
| int width, height; |
| size_t size; |
| |
| #ifdef SK_GAMMA_CONTRAST |
| SkScalar contrast = SK_GAMMA_CONTRAST; |
| #else |
| SkScalar contrast = 0.5f; |
| #endif |
| SkScalar paintGamma = fDeviceProperties.gamma(); |
| SkScalar deviceGamma = fDeviceProperties.gamma(); |
| |
| size = SkScalerContext::GetGammaLUTSize(contrast, paintGamma, deviceGamma, |
| &width, &height); |
| |
| SkASSERT(kExpectedDistanceAdjustTableSize == height); |
| fDistanceAdjustTable = SkNEW_ARRAY(SkScalar, height); |
| |
| SkAutoTArray<uint8_t> data((int)size); |
| SkScalerContext::GetGammaLUTData(contrast, paintGamma, deviceGamma, data.get()); |
| |
| // find the inverse points where we cross 0.5 |
| // binsearch might be better, but we only need to do this once on creation |
| for (int row = 0; row < height; ++row) { |
| uint8_t* rowPtr = data.get() + row*width; |
| for (int col = 0; col < width - 1; ++col) { |
| if (rowPtr[col] <= 127 && rowPtr[col + 1] >= 128) { |
| // compute point where a mask value will give us a result of 0.5 |
| float interp = (127.5f - rowPtr[col]) / (rowPtr[col + 1] - rowPtr[col]); |
| float borderAlpha = (col + interp) / 255.f; |
| |
| // compute t value for that alpha |
| // this is an approximate inverse for smoothstep() |
| float t = borderAlpha*(borderAlpha*(4.0f*borderAlpha - 6.0f) + 5.0f) / 3.0f; |
| |
| // compute distance which gives us that t value |
| const float kDistanceFieldAAFactor = 0.65f; // should match SK_DistanceFieldAAFactor |
| float d = 2.0f*kDistanceFieldAAFactor*t - kDistanceFieldAAFactor; |
| |
| fDistanceAdjustTable[row] = d; |
| break; |
| } |
| } |
| } |
| } |
| |
| |
| GrDistanceFieldTextContext::~GrDistanceFieldTextContext() { |
| SkDELETE_ARRAY(fDistanceAdjustTable); |
| fDistanceAdjustTable = NULL; |
| } |
| |
| bool GrDistanceFieldTextContext::canDraw(const GrRenderTarget* rt, |
| const GrClip& clip, |
| const GrPaint& paint, |
| const SkPaint& skPaint, |
| const SkMatrix& viewMatrix) { |
| // TODO: support perspective (need getMaxScale replacement) |
| if (viewMatrix.hasPerspective()) { |
| return false; |
| } |
| |
| SkScalar maxScale = viewMatrix.getMaxScale(); |
| SkScalar scaledTextSize = maxScale*skPaint.getTextSize(); |
| // Hinted text looks far better at small resolutions |
| // Scaling up beyond 2x yields undesireable artifacts |
| if (scaledTextSize < kMinDFFontSize || scaledTextSize > 2*kLargeDFFontSize) { |
| return false; |
| } |
| |
| if (!fEnableDFRendering && !skPaint.isDistanceFieldTextTEMP() && |
| scaledTextSize < kLargeDFFontSize) { |
| return false; |
| } |
| |
| // rasterizers and mask filters modify alpha, which doesn't |
| // translate well to distance |
| if (skPaint.getRasterizer() || skPaint.getMaskFilter() || |
| !fContext->getTextTarget()->caps()->shaderDerivativeSupport()) { |
| return false; |
| } |
| |
| // TODO: add some stroking support |
| if (skPaint.getStyle() != SkPaint::kFill_Style) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| inline void GrDistanceFieldTextContext::init(GrRenderTarget* rt, const GrClip& clip, |
| const GrPaint& paint, const SkPaint& skPaint, |
| const SkIRect& regionClipBounds) { |
| GrTextContext::init(rt, clip, paint, skPaint, regionClipBounds); |
| |
| 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, 0x7F)); |
| fPaint.setColor(GrColorPackRGBA(0x00, 0x00, 0x7F, 0xFF)); |
| #endif |
| } else if (scaledTextSize <= kMediumDFFontLimit) { |
| fTextRatio = textSize / kMediumDFFontSize; |
| fSkPaint.setTextSize(SkIntToScalar(kMediumDFFontSize)); |
| #if DEBUG_TEXT_SIZE |
| fSkPaint.setColor(SkColorSetARGB(0xFF, 0x00, 0x3F, 0x00)); |
| fPaint.setColor(GrColorPackRGBA(0x00, 0x3F, 0x00, 0xFF)); |
| #endif |
| } else { |
| fTextRatio = textSize / kLargeDFFontSize; |
| fSkPaint.setTextSize(SkIntToScalar(kLargeDFFontSize)); |
| #if DEBUG_TEXT_SIZE |
| fSkPaint.setColor(SkColorSetARGB(0xFF, 0x7F, 0x00, 0x00)); |
| fPaint.setColor(GrColorPackRGBA(0x7F, 0x00, 0x00, 0xFF)); |
| #endif |
| } |
| |
| fUseLCDText = fSkPaint.isLCDRenderText(); |
| |
| fSkPaint.setLCDRenderText(false); |
| fSkPaint.setAutohinted(false); |
| fSkPaint.setHinting(SkPaint::kNormal_Hinting); |
| fSkPaint.setSubpixelText(true); |
| } |
| |
| void GrDistanceFieldTextContext::onDrawText(GrRenderTarget* rt, const GrClip& clip, |
| const GrPaint& paint, |
| const SkPaint& skPaint, const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| SkScalar x, SkScalar y, |
| const SkIRect& regionClipBounds) { |
| 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(origin, width))); |
| |
| SkFixed height = glyph.fAdvanceY; |
| positions.push_back(SkFixedToScalar(stopY + SkFixedMul(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->onDrawPosText(rt, clip, paint, skPaint, viewMatrix, text, byteLength, positions.begin(), |
| 2, offset, regionClipBounds); |
| } |
| |
| void GrDistanceFieldTextContext::onDrawPosText(GrRenderTarget* rt, const GrClip& clip, |
| const GrPaint& paint, |
| const SkPaint& skPaint, const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| const SkScalar pos[], int scalarsPerPosition, |
| const SkPoint& offset, |
| const SkIRect& regionClipBounds) { |
| |
| 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(rt, clip, paint, skPaint, regionClipBounds); |
| |
| SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc(); |
| |
| SkAutoGlyphCacheNoGamma autoCache(fSkPaint, &fDeviceProperties, NULL); |
| SkGlyphCache* cache = autoCache.getCache(); |
| GrFontScaler* fontScaler = GetGrFontScaler(cache); |
| |
| 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(), |
| GrGlyph::kDistance_MaskStyle), |
| 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(), |
| GrGlyph::kDistance_MaskStyle), |
| 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(rt, clip, paint, skPaint, viewMatrix, |
| fallbackTxt.begin(), fallbackTxt.count(), |
| fallbackPos.begin(), scalarsPerPosition, offset, |
| regionClipBounds); |
| } |
| } |
| |
| 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 ? (sizeof(SkPoint) + sizeof(GrColor) + sizeof(SkIPoint16)) : |
| (sizeof(SkPoint) + sizeof(SkIPoint16)); |
| } |
| |
| 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::kClamp_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); |
| |
| float redCorrection = |
| fDistanceAdjustTable[GrColorUnpackR(colorNoPreMul) >> kDistanceAdjustLumShift]; |
| float greenCorrection = |
| fDistanceAdjustTable[GrColorUnpackG(colorNoPreMul) >> kDistanceAdjustLumShift]; |
| float blueCorrection = |
| fDistanceAdjustTable[GrColorUnpackB(colorNoPreMul) >> kDistanceAdjustLumShift]; |
| GrDistanceFieldLCDTextureEffect::DistanceAdjust widthAdjust = |
| GrDistanceFieldLCDTextureEffect::DistanceAdjust::Make(redCorrection, |
| greenCorrection, |
| blueCorrection); |
| fCachedGeometryProcessor.reset(GrDistanceFieldLCDTextureEffect::Create(color, |
| fViewMatrix, |
| fCurrTexture, |
| params, |
| widthAdjust, |
| flags)); |
| } else { |
| flags |= kColorAttr_DistanceFieldEffectFlag; |
| bool opaque = GrColorIsOpaque(color); |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| U8CPU lum = SkColorSpaceLuminance::computeLuminance(fDeviceProperties.gamma(), |
| filteredColor); |
| float correction = fDistanceAdjustTable[lum >> kDistanceAdjustLumShift]; |
| fCachedGeometryProcessor.reset(GrDistanceFieldTextureEffect::Create(color, |
| fViewMatrix, |
| fCurrTexture, |
| params, |
| correction, |
| flags, |
| opaque)); |
| #else |
| fCachedGeometryProcessor.reset(GrDistanceFieldTextureEffect::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); |
| } |
| |
| 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()))) { |
| 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(fRenderTarget, fClip, 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); |
| } |
| |
| fVertexBounds.joinNonEmptyArg(glyphRect); |
| |
| int u0 = glyph->fAtlasLocation.fX + SK_DistanceFieldInset; |
| int v0 = glyph->fAtlasLocation.fY + SK_DistanceFieldInset; |
| int u1 = u0 + glyph->fBounds.width() - 2*SK_DistanceFieldInset; |
| int v1 = v0 + glyph->fBounds.height() - 2*SK_DistanceFieldInset; |
| |
| size_t vertSize = get_vertex_stride(useColorVerts); |
| intptr_t vertex = reinterpret_cast<intptr_t>(fVertices) + vertSize * fCurrVertex; |
| |
| // V0 |
| SkPoint* position = reinterpret_cast<SkPoint*>(vertex); |
| position->set(glyphRect.fLeft, glyphRect.fTop); |
| if (useColorVerts) { |
| SkColor* color = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint)); |
| *color = fPaint.getColor(); |
| } |
| SkIPoint16* textureCoords = reinterpret_cast<SkIPoint16*>(vertex + vertSize - |
| sizeof(SkIPoint16)); |
| textureCoords->set(u0, v0); |
| vertex += vertSize; |
| |
| // V1 |
| position = reinterpret_cast<SkPoint*>(vertex); |
| position->set(glyphRect.fLeft, glyphRect.fBottom); |
| if (useColorVerts) { |
| SkColor* color = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint)); |
| *color = fPaint.getColor(); |
| } |
| textureCoords = reinterpret_cast<SkIPoint16*>(vertex + vertSize - sizeof(SkIPoint16)); |
| textureCoords->set(u0, v1); |
| vertex += vertSize; |
| |
| // V2 |
| position = reinterpret_cast<SkPoint*>(vertex); |
| position->set(glyphRect.fRight, glyphRect.fBottom); |
| if (useColorVerts) { |
| SkColor* color = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint)); |
| *color = fPaint.getColor(); |
| } |
| textureCoords = reinterpret_cast<SkIPoint16*>(vertex + vertSize - sizeof(SkIPoint16)); |
| textureCoords->set(u1, v1); |
| vertex += vertSize; |
| |
| // V3 |
| position = reinterpret_cast<SkPoint*>(vertex); |
| position->set(glyphRect.fRight, glyphRect.fTop); |
| if (useColorVerts) { |
| SkColor* color = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint)); |
| *color = fPaint.getColor(); |
| } |
| textureCoords = reinterpret_cast<SkIPoint16*>(vertex + vertSize - sizeof(SkIPoint16)); |
| textureCoords->set(u1, v0); |
| |
| fCurrVertex += 4; |
| |
| return true; |
| } |
| |
| void GrDistanceFieldTextContext::flush() { |
| if (NULL == fDrawTarget) { |
| return; |
| } |
| |
| if (fCurrVertex > 0) { |
| GrPipelineBuilder pipelineBuilder; |
| pipelineBuilder.setFromPaint(fPaint, fRenderTarget, fClip); |
| |
| // 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. |
| const GrXPFactory* xpFactory = pipelineBuilder.getXPFactory(); |
| if (!xpFactory->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(&pipelineBuilder, |
| 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(); |
| } |
| |
