| /* |
| * 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 "GrRenderTargetContext.h" |
| #include "GrTextBlobCache.h" |
| #include "SkDraw.h" |
| #include "SkDrawFilter.h" |
| #include "SkGr.h" |
| #include "ops/GrMeshDrawOp.h" |
| |
| GrAtlasTextContext::GrAtlasTextContext() |
| : fDistanceAdjustTable(new GrDistanceFieldAdjustTable) { |
| } |
| |
| GrAtlasTextContext* GrAtlasTextContext::Create() { |
| return new GrAtlasTextContext(); |
| } |
| |
| bool GrAtlasTextContext::canDraw(const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, |
| const GrShaderCaps& shaderCaps) { |
| return GrTextUtils::CanDrawAsDistanceFields(skPaint, viewMatrix, props, shaderCaps) || |
| !SkDraw::ShouldDrawTextAsPaths(skPaint, viewMatrix); |
| } |
| |
| 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; |
| } |
| |
| uint32_t GrAtlasTextContext::ComputeScalerContextFlags(GrRenderTargetContext* rtc) { |
| // 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 (rtc->isGammaCorrect()) { |
| return SkPaint::kBoostContrast_ScalerContextFlag; |
| } else { |
| return SkPaint::kFakeGammaAndBoostContrast_ScalerContextFlags; |
| } |
| } |
| |
| // 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, GrRenderTargetContext* rtc, |
| 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; |
| SkMaskFilter::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 && !mf->asABlur(&blurRec)) || |
| drawFilter); |
| uint32_t scalerContextFlags = ComputeScalerContextFlags(rtc); |
| |
| GrTextBlobCache* cache = context->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.reset(SkSafeRef(cache->find(key))); |
| } |
| |
| GrTextUtils::Paint paint(&skPaint); |
| 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 |
| cache->remove(cacheBlob.get()); |
| cacheBlob.reset(SkRef(cache->createCachedBlob(blob, key, blurRec, skPaint))); |
| RegenerateTextBlob(cacheBlob.get(), context->getAtlasGlyphCache(), |
| *context->caps()->shaderCaps(), paint, scalerContextFlags, |
| viewMatrix, props, blob, x, y, drawFilter); |
| } else { |
| cache->makeMRU(cacheBlob.get()); |
| |
| if (CACHE_SANITY_CHECK) { |
| int glyphCount = 0; |
| int runCount = 0; |
| GrTextBlobCache::BlobGlyphCount(&glyphCount, &runCount, blob); |
| sk_sp<GrAtlasTextBlob> sanityBlob(cache->createBlob(glyphCount, runCount)); |
| sanityBlob->setupKey(key, blurRec, skPaint); |
| RegenerateTextBlob(sanityBlob.get(), context->getAtlasGlyphCache(), |
| *context->caps()->shaderCaps(), paint, scalerContextFlags, |
| viewMatrix, props, blob, x, y, drawFilter); |
| GrAtlasTextBlob::AssertEqual(*sanityBlob, *cacheBlob); |
| } |
| } |
| } else { |
| if (canCache) { |
| cacheBlob.reset(SkRef(cache->createCachedBlob(blob, key, blurRec, skPaint))); |
| } else { |
| cacheBlob.reset(cache->createBlob(blob)); |
| } |
| RegenerateTextBlob(cacheBlob.get(), context->getAtlasGlyphCache(), |
| *context->caps()->shaderCaps(), paint, scalerContextFlags, viewMatrix, |
| props, blob, x, y, drawFilter); |
| } |
| |
| cacheBlob->flushCached(context, rtc, 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, |
| uint32_t scalerContextFlags, const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, const SkTextBlob* blob, |
| SkScalar x, SkScalar y, SkDrawFilter* drawFilter) { |
| cacheBlob->initReusableBlob(paint.filteredSkColor(), 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 (GrTextUtils::CanDrawAsDistanceFields(runPaint, viewMatrix, props, shaderCaps)) { |
| switch (it.positioning()) { |
| case SkTextBlob::kDefault_Positioning: { |
| GrTextUtils::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()); |
| GrTextUtils::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); |
| GrTextUtils::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->setRunDrawAsPaths(run); |
| } else { |
| switch (it.positioning()) { |
| case SkTextBlob::kDefault_Positioning: |
| GrTextUtils::DrawBmpText(cacheBlob, run, fontCache, props, runPaint, |
| scalerContextFlags, viewMatrix, |
| (const char*)it.glyphs(), textLen, x + offset.x(), |
| y + offset.y()); |
| break; |
| case SkTextBlob::kHorizontal_Positioning: |
| GrTextUtils::DrawBmpPosText(cacheBlob, run, fontCache, props, runPaint, |
| scalerContextFlags, viewMatrix, |
| (const char*)it.glyphs(), textLen, it.pos(), 1, |
| SkPoint::Make(x, y + offset.y())); |
| break; |
| case SkTextBlob::kFull_Positioning: |
| GrTextUtils::DrawBmpPosText(cacheBlob, run, fontCache, props, runPaint, |
| scalerContextFlags, viewMatrix, |
| (const char*)it.glyphs(), textLen, it.pos(), 2, |
| SkPoint::Make(x, y)); |
| break; |
| } |
| } |
| } |
| } |
| |
| inline GrAtlasTextBlob* |
| GrAtlasTextContext::CreateDrawTextBlob(GrTextBlobCache* blobCache, |
| GrAtlasGlyphCache* fontCache, |
| const GrShaderCaps& shaderCaps, |
| const GrTextUtils::Paint& paint, |
| uint32_t scalerContextFlags, |
| const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, |
| const char text[], size_t byteLength, |
| SkScalar x, SkScalar y) { |
| int glyphCount = paint.skPaint().countText(text, byteLength); |
| |
| GrAtlasTextBlob* blob = blobCache->createBlob(glyphCount, 1); |
| blob->initThrowawayBlob(viewMatrix, x, y); |
| |
| if (GrTextUtils::CanDrawAsDistanceFields(paint, viewMatrix, props, shaderCaps)) { |
| GrTextUtils::DrawDFText(blob, 0, fontCache, props, paint, scalerContextFlags, viewMatrix, |
| text, byteLength, x, y); |
| } else { |
| GrTextUtils::DrawBmpText(blob, 0, fontCache, props, paint, scalerContextFlags, viewMatrix, |
| text, byteLength, x, y); |
| } |
| return blob; |
| } |
| |
| inline GrAtlasTextBlob* |
| GrAtlasTextContext::CreateDrawPosTextBlob(GrTextBlobCache* blobCache, |
| GrAtlasGlyphCache* fontCache, |
| const GrShaderCaps& shaderCaps, |
| const GrTextUtils::Paint& paint, |
| uint32_t scalerContextFlags, |
| const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, |
| const char text[], size_t byteLength, |
| const SkScalar pos[], int scalarsPerPosition, const |
| SkPoint& offset) { |
| int glyphCount = paint.skPaint().countText(text, byteLength); |
| |
| GrAtlasTextBlob* blob = blobCache->createBlob(glyphCount, 1); |
| blob->initThrowawayBlob(viewMatrix, offset.x(), offset.y()); |
| |
| if (GrTextUtils::CanDrawAsDistanceFields(paint, viewMatrix, props, shaderCaps)) { |
| GrTextUtils::DrawDFPosText(blob, 0, fontCache, props, paint, scalerContextFlags, viewMatrix, |
| text, byteLength, pos, scalarsPerPosition, offset); |
| } else { |
| GrTextUtils::DrawBmpPosText(blob, 0, fontCache, props, paint, scalerContextFlags, |
| viewMatrix, text, byteLength, pos, scalarsPerPosition, offset); |
| } |
| return blob; |
| } |
| |
| void GrAtlasTextContext::drawText(GrContext* context, GrRenderTargetContext* rtc, |
| 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; |
| } |
| GrTextUtils::Paint paint(&skPaint); |
| if (this->canDraw(skPaint, viewMatrix, props, *context->caps()->shaderCaps())) { |
| sk_sp<GrAtlasTextBlob> blob( |
| CreateDrawTextBlob(context->getTextBlobCache(), context->getAtlasGlyphCache(), |
| *context->caps()->shaderCaps(), |
| paint, ComputeScalerContextFlags(rtc), |
| viewMatrix, props, |
| text, byteLength, x, y)); |
| blob->flushThrowaway(context, rtc, props, fDistanceAdjustTable.get(), paint, clip, |
| viewMatrix, regionClipBounds, x, y); |
| return; |
| } |
| |
| // fall back to drawing as a path |
| GrTextUtils::DrawTextAsPath(context, rtc, clip, paint, viewMatrix, text, byteLength, x, y, |
| regionClipBounds); |
| } |
| |
| void GrAtlasTextContext::drawPosText(GrContext* context, GrRenderTargetContext* rtc, |
| 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); |
| if (context->abandoned()) { |
| return; |
| } else if (this->canDraw(skPaint, viewMatrix, props, *context->caps()->shaderCaps())) { |
| sk_sp<GrAtlasTextBlob> blob( |
| CreateDrawPosTextBlob(context->getTextBlobCache(), context->getAtlasGlyphCache(), |
| *context->caps()->shaderCaps(), |
| paint, ComputeScalerContextFlags(rtc), |
| viewMatrix, props, |
| text, byteLength, |
| pos, scalarsPerPosition, |
| offset)); |
| blob->flushThrowaway(context, rtc, props, fDistanceAdjustTable.get(), paint, clip, |
| viewMatrix, regionClipBounds, offset.fX, offset.fY); |
| return; |
| } |
| |
| // fall back to drawing as a path |
| GrTextUtils::DrawPosTextAsPath(context, rtc, props, clip, paint, viewMatrix, text, byteLength, |
| pos, scalarsPerPosition, offset, regionClipBounds); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| #if GR_TEST_UTILS |
| |
| DRAW_OP_TEST_DEFINE(TextBlobOp) { |
| static uint32_t gContextID = SK_InvalidGenID; |
| static GrAtlasTextContext* gTextContext = nullptr; |
| static SkSurfaceProps gSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType); |
| |
| if (context->uniqueID() != gContextID) { |
| gContextID = context->uniqueID(); |
| delete gTextContext; |
| |
| gTextContext = GrAtlasTextContext::Create(); |
| } |
| |
| // Setup dummy SkPaint / GrPaint / GrRenderTargetContext |
| sk_sp<GrRenderTargetContext> renderTargetContext(context->makeRenderTargetContext( |
| SkBackingFit::kApprox, 1024, 1024, kRGBA_8888_GrPixelConfig, nullptr)); |
| |
| SkMatrix viewMatrix = GrTest::TestMatrixInvertible(random); |
| SkPaint skPaint; |
| skPaint.setColor(random->nextU()); |
| skPaint.setLCDRenderText(random->nextBool()); |
| skPaint.setAntiAlias(skPaint.isLCDRenderText() ? true : random->nextBool()); |
| skPaint.setSubpixelText(random->nextBool()); |
| |
| 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); |
| |
| GrTextUtils::Paint paint(&skPaint); |
| // 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(GrAtlasTextContext::CreateDrawTextBlob( |
| context->getTextBlobCache(), context->getAtlasGlyphCache(), |
| *context->caps()->shaderCaps(), paint, |
| GrAtlasTextContext::kTextBlobOpScalerContextFlags, viewMatrix, gSurfaceProps, text, |
| static_cast<size_t>(textLen), x, y)); |
| |
| return blob->test_makeOp(textLen, 0, 0, viewMatrix, x, y, paint, gSurfaceProps, |
| gTextContext->dfAdjustTable(), context->getAtlasGlyphCache()); |
| } |
| |
| #endif |