| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "GrAtlasTextContext.h" |
| #include "GrContext.h" |
| #include "GrContextPriv.h" |
| #include "GrTextBlobCache.h" |
| #include "SkDistanceFieldGen.h" |
| #include "SkDraw.h" |
| #include "SkDrawFilter.h" |
| #include "SkFindAndPlaceGlyph.h" |
| #include "SkGr.h" |
| #include "SkGraphics.h" |
| #include "SkMakeUnique.h" |
| #include "SkMaskFilterBase.h" |
| #include "ops/GrMeshDrawOp.h" |
| |
| // DF sizes and thresholds for usage of the small and medium sizes. For example, above |
| // kSmallDFFontLimit we will use the medium size. The large size is used up until the size at |
| // which we switch over to drawing as paths as controlled by Options. |
| 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 kDefaultMinDistanceFieldFontSize = 18; |
| #ifdef SK_BUILD_FOR_ANDROID |
| static const int kDefaultMaxDistanceFieldFontSize = 384; |
| #else |
| static const int kDefaultMaxDistanceFieldFontSize = 2 * kLargeDFFontSize; |
| #endif |
| |
| GrAtlasTextContext::GrAtlasTextContext(const Options& options) |
| : fDistanceAdjustTable(new GrDistanceFieldAdjustTable) { |
| fMaxDistanceFieldFontSize = options.fMaxDistanceFieldFontSize < 0.f |
| ? kDefaultMaxDistanceFieldFontSize |
| : options.fMaxDistanceFieldFontSize; |
| fMinDistanceFieldFontSize = options.fMinDistanceFieldFontSize < 0.f |
| ? kDefaultMinDistanceFieldFontSize |
| : options.fMinDistanceFieldFontSize; |
| fDistanceFieldVerticesAlwaysHaveW = options.fDistanceFieldVerticesAlwaysHaveW; |
| } |
| |
| std::unique_ptr<GrAtlasTextContext> GrAtlasTextContext::Make(const Options& options) { |
| return std::unique_ptr<GrAtlasTextContext>(new GrAtlasTextContext(options)); |
| } |
| |
| bool GrAtlasTextContext::canDraw(const GrAtlasGlyphCache* fontCache, |
| const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, |
| const GrShaderCaps& shaderCaps) { |
| return this->canDrawAsDistanceFields(skPaint, viewMatrix, props, shaderCaps) || |
| !SkDraw::ShouldDrawTextAsPaths(skPaint, viewMatrix, fontCache->getGlyphSizeLimit()); |
| } |
| |
| SkColor GrAtlasTextContext::ComputeCanonicalColor(const SkPaint& paint, bool lcd) { |
| SkColor canonicalColor = paint.computeLuminanceColor(); |
| if (lcd) { |
| // This is the correct computation, but there are tons of cases where LCD can be overridden. |
| // For now we just regenerate if any run in a textblob has LCD. |
| // TODO figure out where all of these overrides are and see if we can incorporate that logic |
| // at a higher level *OR* use sRGB |
| SkASSERT(false); |
| //canonicalColor = SkMaskGamma::CanonicalColor(canonicalColor); |
| } else { |
| // A8, though can have mixed BMP text but it shouldn't matter because BMP text won't have |
| // gamma corrected masks anyways, nor color |
| U8CPU lum = SkComputeLuminance(SkColorGetR(canonicalColor), |
| SkColorGetG(canonicalColor), |
| SkColorGetB(canonicalColor)); |
| // reduce to our finite number of bits |
| canonicalColor = SkMaskGamma::CanonicalColor(SkColorSetRGB(lum, lum, lum)); |
| } |
| return canonicalColor; |
| } |
| |
| SkScalerContextFlags GrAtlasTextContext::ComputeScalerContextFlags( |
| const GrColorSpaceInfo& colorSpaceInfo) { |
| // If we're doing gamma-correct rendering, then we can disable the gamma hacks. |
| // Otherwise, leave them on. In either case, we still want the contrast boost: |
| if (colorSpaceInfo.isGammaCorrect()) { |
| return SkScalerContextFlags::kBoostContrast; |
| } else { |
| return SkScalerContextFlags::kFakeGammaAndBoostContrast; |
| } |
| } |
| |
| // TODO if this function ever shows up in profiling, then we can compute this value when the |
| // textblob is being built and cache it. However, for the time being textblobs mostly only have 1 |
| // run so this is not a big deal to compute here. |
| bool GrAtlasTextContext::HasLCD(const SkTextBlob* blob) { |
| SkTextBlobRunIterator it(blob); |
| for (; !it.done(); it.next()) { |
| if (it.isLCD()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| void GrAtlasTextContext::drawTextBlob(GrContext* context, GrTextUtils::Target* target, |
| const GrClip& clip, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, const SkSurfaceProps& props, |
| const SkTextBlob* blob, SkScalar x, SkScalar y, |
| SkDrawFilter* drawFilter, const SkIRect& clipBounds) { |
| // If we have been abandoned, then don't draw |
| if (context->abandoned()) { |
| return; |
| } |
| |
| sk_sp<GrAtlasTextBlob> cacheBlob; |
| SkMaskFilterBase::BlurRec blurRec; |
| GrAtlasTextBlob::Key key; |
| // It might be worth caching these things, but its not clear at this time |
| // TODO for animated mask filters, this will fill up our cache. We need a safeguard here |
| const SkMaskFilter* mf = skPaint.getMaskFilter(); |
| bool canCache = !(skPaint.getPathEffect() || |
| (mf && !as_MFB(mf)->asABlur(&blurRec)) || |
| drawFilter); |
| SkScalerContextFlags scalerContextFlags = ComputeScalerContextFlags(target->colorSpaceInfo()); |
| |
| auto atlasGlyphCache = context->contextPriv().getAtlasGlyphCache(); |
| GrTextBlobCache* textBlobCache = context->contextPriv().getTextBlobCache(); |
| |
| if (canCache) { |
| bool hasLCD = HasLCD(blob); |
| |
| // We canonicalize all non-lcd draws to use kUnknown_SkPixelGeometry |
| SkPixelGeometry pixelGeometry = hasLCD ? props.pixelGeometry() : |
| kUnknown_SkPixelGeometry; |
| |
| // TODO we want to figure out a way to be able to use the canonical color on LCD text, |
| // see the note on ComputeCanonicalColor above. We pick a dummy value for LCD text to |
| // ensure we always match the same key |
| GrColor canonicalColor = hasLCD ? SK_ColorTRANSPARENT : |
| ComputeCanonicalColor(skPaint, hasLCD); |
| |
| key.fPixelGeometry = pixelGeometry; |
| key.fUniqueID = blob->uniqueID(); |
| key.fStyle = skPaint.getStyle(); |
| key.fHasBlur = SkToBool(mf); |
| key.fCanonicalColor = canonicalColor; |
| key.fScalerContextFlags = scalerContextFlags; |
| cacheBlob = textBlobCache->find(key); |
| } |
| |
| GrTextUtils::Paint paint(&skPaint, &target->colorSpaceInfo()); |
| if (cacheBlob) { |
| if (cacheBlob->mustRegenerate(paint, blurRec, viewMatrix, x, y)) { |
| // We have to remake the blob because changes may invalidate our masks. |
| // TODO we could probably get away reuse most of the time if the pointer is unique, |
| // but we'd have to clear the subrun information |
| textBlobCache->remove(cacheBlob.get()); |
| cacheBlob = textBlobCache->makeCachedBlob(blob, key, blurRec, skPaint); |
| this->regenerateTextBlob(cacheBlob.get(), atlasGlyphCache, |
| *context->caps()->shaderCaps(), paint, scalerContextFlags, |
| viewMatrix, props, blob, x, y, drawFilter); |
| } else { |
| textBlobCache->makeMRU(cacheBlob.get()); |
| |
| if (CACHE_SANITY_CHECK) { |
| int glyphCount = 0; |
| int runCount = 0; |
| GrTextBlobCache::BlobGlyphCount(&glyphCount, &runCount, blob); |
| sk_sp<GrAtlasTextBlob> sanityBlob(textBlobCache->makeBlob(glyphCount, runCount)); |
| sanityBlob->setupKey(key, blurRec, skPaint); |
| this->regenerateTextBlob(sanityBlob.get(), atlasGlyphCache, |
| *context->caps()->shaderCaps(), paint, scalerContextFlags, |
| viewMatrix, props, blob, x, y, drawFilter); |
| GrAtlasTextBlob::AssertEqual(*sanityBlob, *cacheBlob); |
| } |
| } |
| } else { |
| if (canCache) { |
| cacheBlob = textBlobCache->makeCachedBlob(blob, key, blurRec, skPaint); |
| } else { |
| cacheBlob = textBlobCache->makeBlob(blob); |
| } |
| this->regenerateTextBlob(cacheBlob.get(), atlasGlyphCache, |
| *context->caps()->shaderCaps(), paint, scalerContextFlags, |
| viewMatrix, props, blob, x, y, drawFilter); |
| } |
| |
| cacheBlob->flushCached(atlasGlyphCache, target, blob, props, fDistanceAdjustTable.get(), paint, |
| drawFilter, clip, viewMatrix, clipBounds, x, y); |
| } |
| |
| void GrAtlasTextContext::regenerateTextBlob(GrAtlasTextBlob* cacheBlob, |
| GrAtlasGlyphCache* fontCache, |
| const GrShaderCaps& shaderCaps, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags, |
| const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, const SkTextBlob* blob, |
| SkScalar x, SkScalar y, |
| SkDrawFilter* drawFilter) const { |
| cacheBlob->initReusableBlob(paint.luminanceColor(), viewMatrix, x, y); |
| |
| // Regenerate textblob |
| SkTextBlobRunIterator it(blob); |
| GrTextUtils::RunPaint runPaint(&paint, drawFilter, props); |
| for (int run = 0; !it.done(); it.next(), run++) { |
| int glyphCount = it.glyphCount(); |
| size_t textLen = glyphCount * sizeof(uint16_t); |
| const SkPoint& offset = it.offset(); |
| cacheBlob->push_back_run(run); |
| if (!runPaint.modifyForRun(it)) { |
| continue; |
| } |
| if (this->canDrawAsDistanceFields(runPaint, viewMatrix, props, shaderCaps)) { |
| switch (it.positioning()) { |
| case SkTextBlob::kDefault_Positioning: { |
| this->drawDFText(cacheBlob, run, fontCache, props, runPaint, scalerContextFlags, |
| viewMatrix, (const char*)it.glyphs(), textLen, x + offset.x(), |
| y + offset.y()); |
| break; |
| } |
| case SkTextBlob::kHorizontal_Positioning: { |
| SkPoint dfOffset = SkPoint::Make(x, y + offset.y()); |
| this->drawDFPosText(cacheBlob, run, fontCache, props, runPaint, |
| scalerContextFlags, viewMatrix, (const char*)it.glyphs(), |
| textLen, it.pos(), 1, dfOffset); |
| break; |
| } |
| case SkTextBlob::kFull_Positioning: { |
| SkPoint dfOffset = SkPoint::Make(x, y); |
| this->drawDFPosText(cacheBlob, run, fontCache, props, runPaint, |
| scalerContextFlags, viewMatrix, (const char*)it.glyphs(), |
| textLen, it.pos(), 2, dfOffset); |
| break; |
| } |
| } |
| } else if (SkDraw::ShouldDrawTextAsPaths(runPaint, viewMatrix)) { |
| cacheBlob->setRunTooBigForAtlas(run); |
| } else { |
| switch (it.positioning()) { |
| case SkTextBlob::kDefault_Positioning: |
| DrawBmpText(cacheBlob, run, fontCache, props, runPaint, scalerContextFlags, |
| viewMatrix, (const char*)it.glyphs(), textLen, x + offset.x(), |
| y + offset.y()); |
| break; |
| case SkTextBlob::kHorizontal_Positioning: |
| DrawBmpPosText(cacheBlob, run, fontCache, props, runPaint, scalerContextFlags, |
| viewMatrix, (const char*)it.glyphs(), textLen, it.pos(), 1, |
| SkPoint::Make(x, y + offset.y()), SK_Scalar1); |
| break; |
| case SkTextBlob::kFull_Positioning: |
| DrawBmpPosText(cacheBlob, run, fontCache, props, runPaint, scalerContextFlags, |
| viewMatrix, (const char*)it.glyphs(), textLen, it.pos(), 2, |
| SkPoint::Make(x, y), SK_Scalar1); |
| break; |
| } |
| } |
| } |
| } |
| |
| inline sk_sp<GrAtlasTextBlob> |
| GrAtlasTextContext::makeDrawTextBlob(GrTextBlobCache* blobCache, |
| GrAtlasGlyphCache* fontCache, |
| const GrShaderCaps& shaderCaps, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags, |
| const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, |
| const char text[], size_t byteLength, |
| SkScalar x, SkScalar y) const { |
| int glyphCount = paint.skPaint().countText(text, byteLength); |
| if (!glyphCount) { |
| return nullptr; |
| } |
| sk_sp<GrAtlasTextBlob> blob = blobCache->makeBlob(glyphCount, 1); |
| blob->initThrowawayBlob(viewMatrix, x, y); |
| |
| if (this->canDrawAsDistanceFields(paint, viewMatrix, props, shaderCaps)) { |
| this->drawDFText(blob.get(), 0, fontCache, props, paint, scalerContextFlags, viewMatrix, |
| text, byteLength, x, y); |
| } else { |
| DrawBmpText(blob.get(), 0, fontCache, props, paint, scalerContextFlags, viewMatrix, text, |
| byteLength, x, y); |
| } |
| return blob; |
| } |
| |
| inline sk_sp<GrAtlasTextBlob> |
| GrAtlasTextContext::makeDrawPosTextBlob(GrTextBlobCache* blobCache, |
| GrAtlasGlyphCache* fontCache, |
| const GrShaderCaps& shaderCaps, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags, |
| const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, |
| const char text[], size_t byteLength, |
| const SkScalar pos[], int scalarsPerPosition, const |
| SkPoint& offset) const { |
| int glyphCount = paint.skPaint().countText(text, byteLength); |
| if (!glyphCount) { |
| return nullptr; |
| } |
| |
| sk_sp<GrAtlasTextBlob> blob = blobCache->makeBlob(glyphCount, 1); |
| blob->initThrowawayBlob(viewMatrix, offset.x(), offset.y()); |
| |
| if (this->canDrawAsDistanceFields(paint, viewMatrix, props, shaderCaps)) { |
| this->drawDFPosText(blob.get(), 0, fontCache, props, paint, scalerContextFlags, viewMatrix, |
| text, byteLength, pos, scalarsPerPosition, offset); |
| } else { |
| DrawBmpPosText(blob.get(), 0, fontCache, props, paint, scalerContextFlags, viewMatrix, text, |
| byteLength, pos, scalarsPerPosition, offset, SK_Scalar1); |
| } |
| return blob; |
| } |
| |
| void GrAtlasTextContext::drawText(GrContext* context, GrTextUtils::Target* target, |
| const GrClip& clip, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, const SkSurfaceProps& props, |
| const char text[], size_t byteLength, SkScalar x, SkScalar y, |
| const SkIRect& regionClipBounds) { |
| if (context->abandoned()) { |
| return; |
| } |
| |
| auto atlasGlyphCache = context->contextPriv().getAtlasGlyphCache(); |
| auto textBlobCache = context->contextPriv().getTextBlobCache(); |
| |
| GrTextUtils::Paint paint(&skPaint, &target->colorSpaceInfo()); |
| if (this->canDraw(atlasGlyphCache, skPaint, viewMatrix, props, |
| *context->caps()->shaderCaps())) { |
| sk_sp<GrAtlasTextBlob> blob( |
| this->makeDrawTextBlob(textBlobCache, atlasGlyphCache, |
| *context->caps()->shaderCaps(), paint, |
| ComputeScalerContextFlags(target->colorSpaceInfo()), |
| viewMatrix, props, text, byteLength, x, y)); |
| if (blob) { |
| blob->flushThrowaway(atlasGlyphCache, target, props, fDistanceAdjustTable.get(), paint, |
| clip, viewMatrix, regionClipBounds, x, y); |
| } |
| return; |
| } |
| |
| // fall back to drawing as a path or scaled glyph |
| GrTextUtils::DrawBigText(target, clip, paint, viewMatrix, text, byteLength, x, y, |
| regionClipBounds); |
| } |
| |
| void GrAtlasTextContext::drawPosText(GrContext* context, GrTextUtils::Target* target, |
| const GrClip& clip, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, const SkSurfaceProps& props, |
| const char text[], size_t byteLength, const SkScalar pos[], |
| int scalarsPerPosition, const SkPoint& offset, |
| const SkIRect& regionClipBounds) { |
| GrTextUtils::Paint paint(&skPaint, &target->colorSpaceInfo()); |
| if (context->abandoned()) { |
| return; |
| } |
| |
| auto atlasGlyphCache = context->contextPriv().getAtlasGlyphCache(); |
| auto textBlobCache = context->contextPriv().getTextBlobCache(); |
| |
| if (this->canDraw(atlasGlyphCache, skPaint, viewMatrix, props, |
| *context->caps()->shaderCaps())) { |
| sk_sp<GrAtlasTextBlob> blob(this->makeDrawPosTextBlob( |
| textBlobCache, atlasGlyphCache, |
| *context->caps()->shaderCaps(), paint, |
| ComputeScalerContextFlags(target->colorSpaceInfo()), viewMatrix, props, text, |
| byteLength, pos, scalarsPerPosition, offset)); |
| if (blob) { |
| blob->flushThrowaway(atlasGlyphCache, target, props, fDistanceAdjustTable.get(), paint, |
| clip, viewMatrix, regionClipBounds, offset.fX, offset.fY); |
| } |
| return; |
| } |
| |
| // fall back to drawing as a path or scaled glyph |
| GrTextUtils::DrawBigPosText(target, props, clip, paint, viewMatrix, text, |
| byteLength, pos, scalarsPerPosition, offset, regionClipBounds); |
| } |
| |
| void GrAtlasTextContext::DrawBmpText(GrAtlasTextBlob* blob, int runIndex, |
| GrAtlasGlyphCache* fontCache, const SkSurfaceProps& props, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags, |
| const SkMatrix& viewMatrix, const char text[], |
| size_t byteLength, SkScalar x, SkScalar y) { |
| SkASSERT(byteLength == 0 || text != nullptr); |
| |
| // nothing to draw |
| if (text == nullptr || byteLength == 0) { |
| return; |
| } |
| |
| // Ensure the blob is set for bitmaptext |
| blob->setHasBitmap(); |
| |
| GrAtlasTextStrike* currStrike = nullptr; |
| |
| SkGlyphCache* cache = blob->setupCache(runIndex, props, scalerContextFlags, paint, &viewMatrix); |
| SkFindAndPlaceGlyph::ProcessText(paint.skPaint().getTextEncoding(), text, byteLength, {x, y}, |
| viewMatrix, paint.skPaint().getTextAlign(), cache, |
| [&](const SkGlyph& glyph, SkPoint position, SkPoint rounding) { |
| position += rounding; |
| BmpAppendGlyph(blob, runIndex, fontCache, &currStrike, |
| glyph, SkScalarFloorToScalar(position.fX), |
| SkScalarFloorToScalar(position.fY), |
| paint.filteredPremulColor(), cache, |
| SK_Scalar1); |
| }); |
| |
| SkGlyphCache::AttachCache(cache); |
| } |
| |
| void GrAtlasTextContext::DrawBmpPosText(GrAtlasTextBlob* blob, int runIndex, |
| GrAtlasGlyphCache* fontCache, const SkSurfaceProps& props, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, const SkScalar pos[], |
| int scalarsPerPosition, const SkPoint& offset, |
| SkScalar textRatio) { |
| SkASSERT(byteLength == 0 || text != nullptr); |
| SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition); |
| |
| // nothing to draw |
| if (text == nullptr || byteLength == 0) { |
| return; |
| } |
| |
| // Ensure the blob is set for bitmaptext |
| blob->setHasBitmap(); |
| |
| GrAtlasTextStrike* currStrike = nullptr; |
| |
| SkGlyphCache* cache = blob->setupCache(runIndex, props, scalerContextFlags, paint, &viewMatrix); |
| |
| SkFindAndPlaceGlyph::ProcessPosText( |
| paint.skPaint().getTextEncoding(), text, byteLength, offset, viewMatrix, pos, |
| scalarsPerPosition, paint.skPaint().getTextAlign(), cache, |
| [&](const SkGlyph& glyph, SkPoint position, SkPoint rounding) { |
| position += rounding; |
| BmpAppendGlyph(blob, runIndex, fontCache, &currStrike, glyph, |
| SkScalarFloorToScalar(position.fX), |
| SkScalarFloorToScalar(position.fY), |
| paint.filteredPremulColor(), cache, textRatio); |
| }); |
| |
| SkGlyphCache::AttachCache(cache); |
| } |
| |
| void GrAtlasTextContext::BmpAppendGlyph(GrAtlasTextBlob* blob, int runIndex, |
| GrAtlasGlyphCache* fontCache, GrAtlasTextStrike** strike, |
| const SkGlyph& skGlyph, SkScalar sx, SkScalar sy, |
| GrColor color, SkGlyphCache* glyphCache, |
| SkScalar textRatio) { |
| if (!*strike) { |
| *strike = fontCache->getStrike(glyphCache); |
| } |
| |
| GrGlyph::PackedID id = GrGlyph::Pack(skGlyph.getGlyphID(), |
| skGlyph.getSubXFixed(), |
| skGlyph.getSubYFixed(), |
| GrGlyph::kCoverage_MaskStyle); |
| GrGlyph* glyph = (*strike)->getGlyph(skGlyph, id, glyphCache); |
| if (!glyph) { |
| return; |
| } |
| |
| SkASSERT(skGlyph.fWidth == glyph->width()); |
| SkASSERT(skGlyph.fHeight == glyph->height()); |
| |
| SkScalar dx = SkIntToScalar(glyph->fBounds.fLeft); |
| SkScalar dy = SkIntToScalar(glyph->fBounds.fTop); |
| SkScalar width = SkIntToScalar(glyph->fBounds.width()); |
| SkScalar height = SkIntToScalar(glyph->fBounds.height()); |
| |
| dx *= textRatio; |
| dy *= textRatio; |
| width *= textRatio; |
| height *= textRatio; |
| |
| SkRect glyphRect = SkRect::MakeXYWH(sx + dx, sy + dy, width, height); |
| |
| blob->appendGlyph(runIndex, glyphRect, color, *strike, glyph, glyphCache, skGlyph, sx, sy, |
| textRatio, true); |
| } |
| |
| bool GrAtlasTextContext::canDrawAsDistanceFields(const SkPaint& skPaint, const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, |
| const GrShaderCaps& caps) const { |
| if (!viewMatrix.hasPerspective()) { |
| 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 < fMinDistanceFieldFontSize || |
| scaledTextSize > fMaxDistanceFieldFontSize) { |
| return false; |
| } |
| |
| bool useDFT = props.isUseDeviceIndependentFonts(); |
| #if SK_FORCE_DISTANCE_FIELD_TEXT |
| useDFT = true; |
| #endif |
| |
| if (!useDFT && scaledTextSize < kLargeDFFontSize) { |
| return false; |
| } |
| } |
| |
| // mask filters modify alpha, which doesn't translate well to distance |
| if (skPaint.getMaskFilter() || !caps.shaderDerivativeSupport()) { |
| return false; |
| } |
| |
| // TODO: add some stroking support |
| if (skPaint.getStyle() != SkPaint::kFill_Style) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void GrAtlasTextContext::initDistanceFieldPaint(GrAtlasTextBlob* blob, |
| SkPaint* skPaint, |
| SkScalar* textRatio, |
| const SkMatrix& viewMatrix) const { |
| SkScalar textSize = skPaint->getTextSize(); |
| SkScalar scaledTextSize = textSize; |
| |
| if (viewMatrix.hasPerspective()) { |
| // for perspective, we simply force to the medium size |
| // TODO: compute a size based on approximate screen area |
| scaledTextSize = kMediumDFFontLimit; |
| } else { |
| SkScalar maxScale = viewMatrix.getMaxScale(); |
| // 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; |
| } |
| } |
| |
| // We have three sizes of distance field text, and within each size 'bucket' there is a floor |
| // and ceiling. A scale outside of this range would require regenerating the distance fields |
| SkScalar dfMaskScaleFloor; |
| SkScalar dfMaskScaleCeil; |
| if (scaledTextSize <= kSmallDFFontLimit) { |
| dfMaskScaleFloor = fMinDistanceFieldFontSize; |
| dfMaskScaleCeil = kSmallDFFontLimit; |
| *textRatio = textSize / kSmallDFFontSize; |
| skPaint->setTextSize(SkIntToScalar(kSmallDFFontSize)); |
| } else if (scaledTextSize <= kMediumDFFontLimit) { |
| dfMaskScaleFloor = kSmallDFFontLimit; |
| dfMaskScaleCeil = kMediumDFFontLimit; |
| *textRatio = textSize / kMediumDFFontSize; |
| skPaint->setTextSize(SkIntToScalar(kMediumDFFontSize)); |
| } else { |
| dfMaskScaleFloor = kMediumDFFontLimit; |
| dfMaskScaleCeil = fMaxDistanceFieldFontSize; |
| *textRatio = textSize / kLargeDFFontSize; |
| skPaint->setTextSize(SkIntToScalar(kLargeDFFontSize)); |
| } |
| |
| // Because there can be multiple runs in the blob, we want the overall maxMinScale, and |
| // minMaxScale to make regeneration decisions. Specifically, we want the maximum minimum scale |
| // we can tolerate before we'd drop to a lower mip size, and the minimum maximum scale we can |
| // tolerate before we'd have to move to a large mip size. When we actually test these values |
| // we look at the delta in scale between the new viewmatrix and the old viewmatrix, and test |
| // against these values to decide if we can reuse or not(ie, will a given scale change our mip |
| // level) |
| SkASSERT(dfMaskScaleFloor <= scaledTextSize && scaledTextSize <= dfMaskScaleCeil); |
| blob->setMinAndMaxScale(dfMaskScaleFloor / scaledTextSize, dfMaskScaleCeil / scaledTextSize); |
| |
| skPaint->setAntiAlias(true); |
| skPaint->setLCDRenderText(false); |
| skPaint->setAutohinted(false); |
| skPaint->setHinting(SkPaint::kNormal_Hinting); |
| skPaint->setSubpixelText(true); |
| } |
| |
| void GrAtlasTextContext::drawDFText(GrAtlasTextBlob* blob, int runIndex, |
| GrAtlasGlyphCache* fontCache, const SkSurfaceProps& props, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags, |
| const SkMatrix& viewMatrix, const char text[], |
| size_t byteLength, SkScalar x, SkScalar y) const { |
| SkASSERT(byteLength == 0 || text != nullptr); |
| |
| // nothing to draw |
| if (text == nullptr || byteLength == 0) { |
| return; |
| } |
| |
| const SkPaint& skPaint = paint.skPaint(); |
| SkPaint::GlyphCacheProc glyphCacheProc = |
| SkPaint::GetGlyphCacheProc(skPaint.getTextEncoding(), skPaint.isDevKernText(), true); |
| SkAutoDescriptor desc; |
| SkScalerContextEffects effects; |
| // We apply the fake-gamma by altering the distance in the shader, so we ignore the |
| // passed-in scaler context flags. (It's only used when we fall-back to bitmap text). |
| SkScalerContext::CreateDescriptorAndEffectsUsingPaint( |
| skPaint, &props, SkScalerContextFlags::kNone, nullptr, &desc, &effects); |
| SkGlyphCache* origPaintCache = |
| SkGlyphCache::DetachCache(skPaint.getTypeface(), effects, desc.getDesc()); |
| |
| SkTArray<SkScalar> positions; |
| |
| const char* textPtr = text; |
| SkScalar stopX = 0; |
| SkScalar stopY = 0; |
| SkScalar origin = 0; |
| switch (skPaint.getTextAlign()) { |
| case SkPaint::kRight_Align: origin = SK_Scalar1; break; |
| case SkPaint::kCenter_Align: origin = SK_ScalarHalf; break; |
| case SkPaint::kLeft_Align: origin = 0; break; |
| } |
| |
| 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(origPaintCache, &textPtr); |
| |
| SkScalar width = SkFloatToScalar(glyph.fAdvanceX) + autokern.adjust(glyph); |
| positions.push_back(stopX + origin * width); |
| |
| SkScalar height = SkFloatToScalar(glyph.fAdvanceY); |
| positions.push_back(stopY + origin * height); |
| |
| stopX += width; |
| stopY += height; |
| } |
| SkASSERT(textPtr == stop); |
| |
| SkGlyphCache::AttachCache(origPaintCache); |
| |
| // now adjust starting point depending on alignment |
| SkScalar alignX = stopX; |
| SkScalar alignY = 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->drawDFPosText(blob, runIndex, fontCache, props, paint, scalerContextFlags, viewMatrix, |
| text, byteLength, positions.begin(), 2, offset); |
| } |
| |
| void GrAtlasTextContext::drawDFPosText(GrAtlasTextBlob* blob, int runIndex, |
| GrAtlasGlyphCache* fontCache, const SkSurfaceProps& props, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags, |
| const SkMatrix& viewMatrix, const char text[], |
| size_t byteLength, const SkScalar pos[], |
| int scalarsPerPosition, const SkPoint& offset) const { |
| SkASSERT(byteLength == 0 || text != nullptr); |
| SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition); |
| |
| // nothing to draw |
| if (text == nullptr || byteLength == 0) { |
| return; |
| } |
| |
| SkTDArray<char> fallbackTxt; |
| SkTDArray<SkScalar> fallbackPos; |
| |
| SkTDArray<char> bigFallbackTxt; |
| SkTDArray<SkScalar> bigFallbackPos; |
| SkScalar textSize = paint.skPaint().getTextSize(); |
| SkScalar maxTextSize = fontCache->getGlyphSizeLimit(); |
| SkScalar bigFallbackTextSize = maxTextSize; |
| SkScalar maxScale = viewMatrix.getMaxScale(); |
| |
| bool hasWCoord = viewMatrix.hasPerspective() || fDistanceFieldVerticesAlwaysHaveW; |
| |
| // Setup distance field paint and text ratio |
| SkScalar textRatio; |
| SkPaint dfPaint(paint); |
| this->initDistanceFieldPaint(blob, &dfPaint, &textRatio, viewMatrix); |
| blob->setHasDistanceField(); |
| blob->setSubRunHasDistanceFields(runIndex, paint.skPaint().isLCDRenderText(), |
| paint.skPaint().isAntiAlias(), hasWCoord); |
| |
| GrAtlasTextStrike* currStrike = nullptr; |
| |
| // We apply the fake-gamma by altering the distance in the shader, so we ignore the |
| // passed-in scaler context flags. (It's only used when we fall-back to bitmap text). |
| SkGlyphCache* cache = |
| blob->setupCache(runIndex, props, SkScalerContextFlags::kNone, dfPaint, nullptr); |
| SkPaint::GlyphCacheProc glyphCacheProc = |
| SkPaint::GetGlyphCacheProc(dfPaint.getTextEncoding(), dfPaint.isDevKernText(), true); |
| |
| const char* stop = text + byteLength; |
| |
| SkPaint::Align align = dfPaint.getTextAlign(); |
| SkScalar alignMul = SkPaint::kCenter_Align == align ? SK_ScalarHalf : |
| (SkPaint::kRight_Align == align ? SK_Scalar1 : 0); |
| while (text < stop) { |
| const char* lastText = text; |
| // the last 2 parameters are ignored |
| const SkGlyph& glyph = glyphCacheProc(cache, &text); |
| |
| if (glyph.fWidth) { |
| SkScalar x = offset.x() + pos[0]; |
| SkScalar y = offset.y() + (2 == scalarsPerPosition ? pos[1] : 0); |
| |
| SkScalar advanceX = SkFloatToScalar(glyph.fAdvanceX) * alignMul * textRatio; |
| SkScalar advanceY = SkFloatToScalar(glyph.fAdvanceY) * alignMul * textRatio; |
| |
| if (glyph.fMaskFormat != SkMask::kARGB32_Format) { |
| DfAppendGlyph(blob, runIndex, fontCache, &currStrike, glyph, x - advanceX, |
| y - advanceY, paint.filteredPremulColor(), cache, textRatio); |
| } else { |
| // can't append color glyph to SDF batch, send to fallback |
| SkScalar maxDim = SkTMax(glyph.fWidth, glyph.fHeight)*textRatio; |
| SkScalar scaledGlyphSize = maxDim*maxScale; |
| |
| if (!viewMatrix.hasPerspective() && scaledGlyphSize > maxTextSize) { |
| bigFallbackTxt.append(SkToInt(text - lastText), lastText); |
| *bigFallbackPos.append() = maxScale*pos[0]; |
| if (2 == scalarsPerPosition) { |
| *bigFallbackPos.append() = maxScale*pos[1]; |
| } |
| SkScalar glyphTextSize = SkScalarFloorToScalar(maxTextSize*textSize/maxDim); |
| bigFallbackTextSize = SkTMin(glyphTextSize, bigFallbackTextSize); |
| } else { |
| fallbackTxt.append(SkToInt(text - lastText), lastText); |
| *fallbackPos.append() = pos[0]; |
| if (2 == scalarsPerPosition) { |
| *fallbackPos.append() = pos[1]; |
| } |
| } |
| } |
| } |
| pos += scalarsPerPosition; |
| } |
| |
| SkGlyphCache::AttachCache(cache); |
| if (fallbackTxt.count()) { |
| blob->initOverride(runIndex); |
| GrAtlasTextContext::DrawBmpPosText(blob, runIndex, fontCache, props, paint, |
| scalerContextFlags, viewMatrix, fallbackTxt.begin(), |
| fallbackTxt.count(), fallbackPos.begin(), |
| scalarsPerPosition, offset, SK_Scalar1); |
| } |
| |
| if (bigFallbackTxt.count()) { |
| // Set up paint and matrix to scale glyphs |
| blob->initOverride(runIndex); |
| SkPaint largePaint(paint); |
| largePaint.setTextSize(bigFallbackTextSize); |
| // remove maxScale from viewMatrix and move it into textRatio |
| // this keeps the base glyph size consistent regardless of matrix scale |
| SkMatrix modMatrix(viewMatrix); |
| SkScalar invScale = SkScalarInvert(maxScale); |
| modMatrix.preScale(invScale, invScale); |
| SkScalar bigFallbackTextRatio = textSize*maxScale/bigFallbackTextSize; |
| SkPoint modOffset(offset); |
| modOffset *= maxScale; |
| GrTextUtils::Paint textPaint(&largePaint, paint.dstColorSpaceInfo()); |
| GrAtlasTextContext::DrawBmpPosText(blob, runIndex, fontCache, props, textPaint, |
| scalerContextFlags, modMatrix, bigFallbackTxt.begin(), |
| bigFallbackTxt.count(), bigFallbackPos.begin(), |
| scalarsPerPosition, modOffset, bigFallbackTextRatio); |
| } |
| } |
| |
| // TODO: merge with BmpAppendGlyph |
| void GrAtlasTextContext::DfAppendGlyph(GrAtlasTextBlob* blob, int runIndex, |
| GrAtlasGlyphCache* cache, GrAtlasTextStrike** strike, |
| const SkGlyph& skGlyph, SkScalar sx, SkScalar sy, |
| GrColor color, SkGlyphCache* glyphCache, |
| SkScalar textRatio) { |
| if (!*strike) { |
| *strike = cache->getStrike(glyphCache); |
| } |
| |
| GrGlyph::PackedID id = GrGlyph::Pack(skGlyph.getGlyphID(), |
| skGlyph.getSubXFixed(), |
| skGlyph.getSubYFixed(), |
| GrGlyph::kDistance_MaskStyle); |
| GrGlyph* glyph = (*strike)->getGlyph(skGlyph, id, glyphCache); |
| if (!glyph) { |
| return; |
| } |
| |
| 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); |
| |
| dx *= textRatio; |
| dy *= textRatio; |
| width *= textRatio; |
| height *= textRatio; |
| SkRect glyphRect = SkRect::MakeXYWH(sx + dx, sy + dy, width, height); |
| |
| blob->appendGlyph(runIndex, glyphRect, color, *strike, glyph, glyphCache, skGlyph, sx, sy, |
| textRatio, false); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| #if GR_TEST_UTILS |
| |
| #include "GrRenderTargetContext.h" |
| |
| GR_DRAW_OP_TEST_DEFINE(GrAtlasTextOp) { |
| static uint32_t gContextID = SK_InvalidGenID; |
| static std::unique_ptr<GrAtlasTextContext> gTextContext; |
| static SkSurfaceProps gSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType); |
| |
| if (context->uniqueID() != gContextID) { |
| gContextID = context->uniqueID(); |
| gTextContext = GrAtlasTextContext::Make(GrAtlasTextContext::Options()); |
| } |
| |
| // Setup dummy SkPaint / GrPaint / GrRenderTargetContext |
| sk_sp<GrRenderTargetContext> rtc(context->makeDeferredRenderTargetContext( |
| SkBackingFit::kApprox, 1024, 1024, kRGBA_8888_GrPixelConfig, nullptr)); |
| |
| SkMatrix viewMatrix = GrTest::TestMatrixInvertible(random); |
| |
| // Because we the GrTextUtils::Paint requires an SkPaint for font info, we ignore the GrPaint |
| // param. |
| SkPaint skPaint; |
| skPaint.setColor(random->nextU()); |
| skPaint.setLCDRenderText(random->nextBool()); |
| skPaint.setAntiAlias(skPaint.isLCDRenderText() ? true : random->nextBool()); |
| skPaint.setSubpixelText(random->nextBool()); |
| GrTextUtils::Paint utilsPaint(&skPaint, &rtc->colorSpaceInfo()); |
| |
| const char* text = "The quick brown fox jumps over the lazy dog."; |
| int textLen = (int)strlen(text); |
| |
| // create some random x/y offsets, including negative offsets |
| static const int kMaxTrans = 1024; |
| int xPos = (random->nextU() % 2) * 2 - 1; |
| int yPos = (random->nextU() % 2) * 2 - 1; |
| int xInt = (random->nextU() % kMaxTrans) * xPos; |
| int yInt = (random->nextU() % kMaxTrans) * yPos; |
| SkScalar x = SkIntToScalar(xInt); |
| SkScalar y = SkIntToScalar(yInt); |
| |
| auto atlasGlyphCache = context->contextPriv().getAtlasGlyphCache(); |
| |
| // right now we don't handle textblobs, nor do we handle drawPosText. Since we only intend to |
| // test the text op with this unit test, that is okay. |
| sk_sp<GrAtlasTextBlob> blob(gTextContext->makeDrawTextBlob( |
| context->contextPriv().getTextBlobCache(), atlasGlyphCache, |
| *context->caps()->shaderCaps(), utilsPaint, |
| GrAtlasTextContext::kTextBlobOpScalerContextFlags, viewMatrix, gSurfaceProps, text, |
| static_cast<size_t>(textLen), x, y)); |
| |
| return blob->test_makeOp(textLen, 0, 0, viewMatrix, x, y, utilsPaint, gSurfaceProps, |
| gTextContext->dfAdjustTable(), atlasGlyphCache, |
| rtc->textTarget()); |
| } |
| |
| #endif |
