| /* | |
| * 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 "GrDrawContext.h" | |
| #include "GrTextBlobCache.h" | |
| #include "GrTextUtils.h" | |
| #include "SkDraw.h" | |
| #include "SkDrawFilter.h" | |
| #include "SkGrPriv.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); | |
| } | |
| GrColor GrAtlasTextContext::ComputeCanonicalColor(const SkPaint& paint, bool lcd) { | |
| GrColor 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(GrDrawContext* dc) { | |
| // 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 (dc->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, GrDrawContext* dc, | |
| 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; | |
| } | |
| SkAutoTUnref<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(dc); | |
| 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))); | |
| } | |
| // Though for the time being runs in the textblob can override the paint, they only touch font | |
| // info. | |
| GrPaint grPaint; | |
| if (!SkPaintToGrPaint(context, dc, skPaint, viewMatrix, &grPaint)) { | |
| return; | |
| } | |
| if (cacheBlob) { | |
| if (cacheBlob->mustRegenerate(skPaint, grPaint.getColor(), 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); | |
| cacheBlob.reset(SkRef(cache->createCachedBlob(blob, key, blurRec, skPaint))); | |
| RegenerateTextBlob(cacheBlob, context->getBatchFontCache(), | |
| *context->caps()->shaderCaps(), skPaint, grPaint.getColor(), | |
| scalerContextFlags, viewMatrix, props, | |
| blob, x, y, drawFilter); | |
| } else { | |
| cache->makeMRU(cacheBlob); | |
| if (CACHE_SANITY_CHECK) { | |
| int glyphCount = 0; | |
| int runCount = 0; | |
| GrTextBlobCache::BlobGlyphCount(&glyphCount, &runCount, blob); | |
| SkAutoTUnref<GrAtlasTextBlob> sanityBlob(cache->createBlob(glyphCount, runCount)); | |
| sanityBlob->setupKey(key, blurRec, skPaint); | |
| RegenerateTextBlob(sanityBlob, context->getBatchFontCache(), | |
| *context->caps()->shaderCaps(), skPaint, | |
| grPaint.getColor(), 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, context->getBatchFontCache(), | |
| *context->caps()->shaderCaps(), skPaint, grPaint.getColor(), | |
| scalerContextFlags, viewMatrix, props, | |
| blob, x, y, drawFilter); | |
| } | |
| cacheBlob->flushCached(context, dc, blob, props, fDistanceAdjustTable, skPaint, | |
| grPaint, drawFilter, clip, viewMatrix, clipBounds, x, y); | |
| } | |
| void GrAtlasTextContext::RegenerateTextBlob(GrAtlasTextBlob* cacheBlob, | |
| GrBatchFontCache* fontCache, | |
| const GrShaderCaps& shaderCaps, | |
| const SkPaint& skPaint, GrColor color, | |
| uint32_t scalerContextFlags, | |
| const SkMatrix& viewMatrix, | |
| const SkSurfaceProps& props, | |
| const SkTextBlob* blob, SkScalar x, SkScalar y, | |
| SkDrawFilter* drawFilter) { | |
| cacheBlob->initReusableBlob(color, viewMatrix, x, y); | |
| // Regenerate textblob | |
| SkPaint runPaint = skPaint; | |
| SkTextBlobRunIterator it(blob); | |
| 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(); | |
| // applyFontToPaint() always overwrites the exact same attributes, | |
| // so it is safe to not re-seed the paint for this reason. | |
| it.applyFontToPaint(&runPaint); | |
| if (drawFilter && !drawFilter->filter(&runPaint, SkDrawFilter::kText_Type)) { | |
| // A false return from filter() means we should abort the current draw. | |
| runPaint = skPaint; | |
| continue; | |
| } | |
| runPaint.setFlags(GrTextUtils::FilterTextFlags(props, runPaint)); | |
| cacheBlob->push_back_run(run); | |
| if (GrTextUtils::CanDrawAsDistanceFields(runPaint, viewMatrix, props, shaderCaps)) { | |
| switch (it.positioning()) { | |
| case SkTextBlob::kDefault_Positioning: { | |
| GrTextUtils::DrawDFText(cacheBlob, run, fontCache, | |
| props, runPaint, color, 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, color, 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, color, 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, color, 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, color, 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, color, scalerContextFlags, | |
| viewMatrix, (const char*)it.glyphs(), textLen, | |
| it.pos(), 2, SkPoint::Make(x, y)); | |
| break; | |
| } | |
| } | |
| if (drawFilter) { | |
| // A draw filter may change the paint arbitrarily, so we must re-seed in this case. | |
| runPaint = skPaint; | |
| } | |
| } | |
| } | |
| inline GrAtlasTextBlob* | |
| GrAtlasTextContext::CreateDrawTextBlob(GrTextBlobCache* blobCache, | |
| GrBatchFontCache* fontCache, | |
| const GrShaderCaps& shaderCaps, | |
| const GrPaint& paint, | |
| const SkPaint& skPaint, | |
| uint32_t scalerContextFlags, | |
| const SkMatrix& viewMatrix, | |
| const SkSurfaceProps& props, | |
| const char text[], size_t byteLength, | |
| SkScalar x, SkScalar y) { | |
| int glyphCount = skPaint.countText(text, byteLength); | |
| GrAtlasTextBlob* blob = blobCache->createBlob(glyphCount, 1); | |
| blob->initThrowawayBlob(viewMatrix, x, y); | |
| if (GrTextUtils::CanDrawAsDistanceFields(skPaint, viewMatrix, props, shaderCaps)) { | |
| GrTextUtils::DrawDFText(blob, 0, fontCache, props, skPaint, paint.getColor(), | |
| scalerContextFlags, viewMatrix, text, byteLength, x, y); | |
| } else { | |
| GrTextUtils::DrawBmpText(blob, 0, fontCache, props, skPaint, paint.getColor(), | |
| scalerContextFlags, viewMatrix, text, byteLength, x, y); | |
| } | |
| return blob; | |
| } | |
| inline GrAtlasTextBlob* | |
| GrAtlasTextContext::CreateDrawPosTextBlob(GrTextBlobCache* blobCache, GrBatchFontCache* fontCache, | |
| const GrShaderCaps& shaderCaps, const GrPaint& paint, | |
| const SkPaint& skPaint, 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 = skPaint.countText(text, byteLength); | |
| GrAtlasTextBlob* blob = blobCache->createBlob(glyphCount, 1); | |
| blob->initThrowawayBlob(viewMatrix, offset.x(), offset.y()); | |
| if (GrTextUtils::CanDrawAsDistanceFields(skPaint, viewMatrix, props, shaderCaps)) { | |
| GrTextUtils::DrawDFPosText(blob, 0, fontCache, props, | |
| skPaint, paint.getColor(), scalerContextFlags, viewMatrix, text, | |
| byteLength, pos, scalarsPerPosition, offset); | |
| } else { | |
| GrTextUtils::DrawBmpPosText(blob, 0, fontCache, props, skPaint, | |
| paint.getColor(), scalerContextFlags, viewMatrix, text, | |
| byteLength, pos, scalarsPerPosition, offset); | |
| } | |
| return blob; | |
| } | |
| void GrAtlasTextContext::drawText(GrContext* context, | |
| GrDrawContext* dc, | |
| const GrClip& clip, | |
| const GrPaint& paint, 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; | |
| } else if (this->canDraw(skPaint, viewMatrix, props, *context->caps()->shaderCaps())) { | |
| SkAutoTUnref<GrAtlasTextBlob> blob( | |
| CreateDrawTextBlob(context->getTextBlobCache(), context->getBatchFontCache(), | |
| *context->caps()->shaderCaps(), | |
| paint, skPaint, | |
| ComputeScalerContextFlags(dc), | |
| viewMatrix, props, | |
| text, byteLength, x, y)); | |
| blob->flushThrowaway(context, dc, props, fDistanceAdjustTable, skPaint, paint, | |
| clip, viewMatrix, regionClipBounds, x, y); | |
| return; | |
| } | |
| // fall back to drawing as a path | |
| GrTextUtils::DrawTextAsPath(context, dc, clip, skPaint, viewMatrix, text, byteLength, x, y, | |
| regionClipBounds); | |
| } | |
| void GrAtlasTextContext::drawPosText(GrContext* context, | |
| GrDrawContext* dc, | |
| const GrClip& clip, | |
| const GrPaint& paint, 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) { | |
| if (context->abandoned()) { | |
| return; | |
| } else if (this->canDraw(skPaint, viewMatrix, props, *context->caps()->shaderCaps())) { | |
| SkAutoTUnref<GrAtlasTextBlob> blob( | |
| CreateDrawPosTextBlob(context->getTextBlobCache(), | |
| context->getBatchFontCache(), | |
| *context->caps()->shaderCaps(), | |
| paint, skPaint, | |
| ComputeScalerContextFlags(dc), | |
| viewMatrix, props, | |
| text, byteLength, | |
| pos, scalarsPerPosition, | |
| offset)); | |
| blob->flushThrowaway(context, dc, props, fDistanceAdjustTable, skPaint, paint, | |
| clip, viewMatrix, regionClipBounds, offset.fX, offset.fY); | |
| return; | |
| } | |
| // fall back to drawing as a path | |
| GrTextUtils::DrawPosTextAsPath(context, dc, props, clip, skPaint, viewMatrix, text, | |
| byteLength, pos, scalarsPerPosition, offset, regionClipBounds); | |
| } | |
| /////////////////////////////////////////////////////////////////////////////////////////////////// | |
| #ifdef GR_TEST_UTILS | |
| DRAW_BATCH_TEST_DEFINE(TextBlobBatch) { | |
| 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 / GrDrawContext | |
| sk_sp<GrDrawContext> drawContext(context->makeDrawContext(SkBackingFit::kApprox, 1024, 1024, | |
| kSkia8888_GrPixelConfig, nullptr)); | |
| GrColor color = GrRandomColor(random); | |
| SkMatrix viewMatrix = GrTest::TestMatrixInvertible(random); | |
| SkPaint skPaint; | |
| skPaint.setColor(color); | |
| skPaint.setLCDRenderText(random->nextBool()); | |
| skPaint.setAntiAlias(skPaint.isLCDRenderText() ? true : random->nextBool()); | |
| skPaint.setSubpixelText(random->nextBool()); | |
| GrPaint grPaint; | |
| if (!SkPaintToGrPaint(context, drawContext.get(), skPaint, viewMatrix, &grPaint)) { | |
| SkFAIL("couldn't convert paint\n"); | |
| } | |
| 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); | |
| // right now we don't handle textblobs, nor do we handle drawPosText. Since we only | |
| // intend to test the batch with this unit test, that is okay. | |
| SkAutoTUnref<GrAtlasTextBlob> blob( | |
| GrAtlasTextContext::CreateDrawTextBlob(context->getTextBlobCache(), | |
| context->getBatchFontCache(), | |
| *context->caps()->shaderCaps(), grPaint, skPaint, | |
| GrAtlasTextContext::kTextBlobBatchScalerContextFlags, | |
| viewMatrix, | |
| gSurfaceProps, text, | |
| static_cast<size_t>(textLen), x, y)); | |
| return blob->test_createBatch(textLen, 0, 0, viewMatrix, x, y, color, skPaint, | |
| gSurfaceProps, gTextContext->dfAdjustTable(), | |
| context->getBatchFontCache()); | |
| } | |
| #endif |