| /* |
| * 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 "GrDrawContext.h" |
| #include "GrDrawTarget.h" |
| #include "GrFontScaler.h" |
| #include "GrStrokeInfo.h" |
| #include "GrTextBlobCache.h" |
| #include "GrTexturePriv.h" |
| #include "GrTextUtils.h" |
| #include "GrVertexBuffer.h" |
| |
| #include "SkAutoKern.h" |
| #include "SkColorPriv.h" |
| #include "SkColorFilter.h" |
| #include "SkDistanceFieldGen.h" |
| #include "SkDraw.h" |
| #include "SkDrawFilter.h" |
| #include "SkDrawProcs.h" |
| #include "SkFindAndPlaceGlyph.h" |
| #include "SkGlyphCache.h" |
| #include "SkGpuDevice.h" |
| #include "SkGrPriv.h" |
| #include "SkPath.h" |
| #include "SkRTConf.h" |
| #include "SkStrokeRec.h" |
| #include "SkTextBlob.h" |
| #include "SkTextMapStateProc.h" |
| |
| #include "batches/GrAtlasTextBatch.h" |
| |
| GrAtlasTextContext::GrAtlasTextContext(GrContext* context, const SkSurfaceProps& surfaceProps) |
| : INHERITED(context, surfaceProps) |
| , fDistanceAdjustTable(new GrDistanceFieldAdjustTable) { |
| // We overallocate vertices in our textblobs based on the assumption that A8 has the greatest |
| // vertexStride |
| static_assert(GrAtlasTextBlob::kGrayTextVASize >= GrAtlasTextBlob::kColorTextVASize && |
| GrAtlasTextBlob::kGrayTextVASize >= GrAtlasTextBlob::kLCDTextVASize, |
| "vertex_attribute_changed"); |
| fCache = context->getTextBlobCache(); |
| } |
| |
| |
| GrAtlasTextContext* GrAtlasTextContext::Create(GrContext* context, |
| const SkSurfaceProps& surfaceProps) { |
| return new GrAtlasTextContext(context, surfaceProps); |
| } |
| |
| bool GrAtlasTextContext::canDraw(const SkPaint& skPaint, const SkMatrix& viewMatrix) { |
| return GrTextUtils::CanDrawAsDistanceFields(skPaint, viewMatrix, fSurfaceProps, |
| *fContext->caps()->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; |
| } |
| |
| // 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(GrDrawContext* dc, |
| const GrClip& clip, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, const SkTextBlob* blob, |
| SkScalar x, SkScalar y, |
| SkDrawFilter* drawFilter, const SkIRect& clipBounds) { |
| // If we have been abandoned, then don't draw |
| if (fContext->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); |
| |
| if (canCache) { |
| bool hasLCD = HasLCD(blob); |
| |
| // We canonicalize all non-lcd draws to use kUnknown_SkPixelGeometry |
| SkPixelGeometry pixelGeometry = hasLCD ? fSurfaceProps.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; |
| cacheBlob.reset(SkSafeRef(fCache->find(key))); |
| } |
| |
| SkScalar transX = 0.f; |
| SkScalar transY = 0.f; |
| |
| // Though for the time being runs in the textblob can override the paint, they only touch font |
| // info. |
| GrPaint grPaint; |
| if (!SkPaintToGrPaint(fContext, skPaint, viewMatrix, &grPaint)) { |
| return; |
| } |
| |
| if (cacheBlob) { |
| if (cacheBlob->mustRegenerate(&transX, &transY, 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 |
| fCache->remove(cacheBlob); |
| cacheBlob.reset(SkRef(fCache->createCachedBlob(blob, key, blurRec, skPaint))); |
| this->regenerateTextBlob(cacheBlob, skPaint, grPaint.getColor(), viewMatrix, |
| blob, x, y, drawFilter); |
| } else { |
| fCache->makeMRU(cacheBlob); |
| |
| if (CACHE_SANITY_CHECK) { |
| int glyphCount = 0; |
| int runCount = 0; |
| GrTextBlobCache::BlobGlyphCount(&glyphCount, &runCount, blob); |
| SkAutoTUnref<GrAtlasTextBlob> sanityBlob(fCache->createBlob(glyphCount, runCount)); |
| sanityBlob->setupKey(key, blurRec, skPaint); |
| this->regenerateTextBlob(sanityBlob, skPaint, grPaint.getColor(), viewMatrix, |
| blob, x, y, drawFilter); |
| GrAtlasTextBlob::AssertEqual(*sanityBlob, *cacheBlob); |
| } |
| } |
| } else { |
| if (canCache) { |
| cacheBlob.reset(SkRef(fCache->createCachedBlob(blob, key, blurRec, skPaint))); |
| } else { |
| cacheBlob.reset(fCache->createBlob(blob)); |
| } |
| this->regenerateTextBlob(cacheBlob, skPaint, grPaint.getColor(), viewMatrix, |
| blob, x, y, drawFilter); |
| } |
| |
| cacheBlob->flushCached(fContext, dc, blob, fSurfaceProps, fDistanceAdjustTable, skPaint, |
| grPaint, drawFilter, clip, viewMatrix, clipBounds, x, y, transX, transY); |
| } |
| |
| void GrAtlasTextContext::regenerateTextBlob(GrAtlasTextBlob* cacheBlob, |
| const SkPaint& skPaint, GrColor color, |
| const SkMatrix& viewMatrix, |
| 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(FilterTextFlags(fSurfaceProps, runPaint)); |
| |
| cacheBlob->push_back_run(run); |
| |
| if (GrTextUtils::CanDrawAsDistanceFields(runPaint, viewMatrix, fSurfaceProps, |
| *fContext->caps()->shaderCaps())) { |
| switch (it.positioning()) { |
| case SkTextBlob::kDefault_Positioning: { |
| GrTextUtils::DrawDFText(cacheBlob, run, fContext->getBatchFontCache(), |
| fSurfaceProps, runPaint, color, 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, fContext->getBatchFontCache(), |
| fSurfaceProps, runPaint, color, 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, fContext->getBatchFontCache(), |
| fSurfaceProps, runPaint, color, 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, fContext->getBatchFontCache(), |
| fSurfaceProps, runPaint, color, viewMatrix, |
| (const char *)it.glyphs(), textLen, |
| x + offset.x(), y + offset.y()); |
| break; |
| case SkTextBlob::kHorizontal_Positioning: |
| GrTextUtils::DrawBmpPosText(cacheBlob, run, fContext->getBatchFontCache(), |
| fSurfaceProps, runPaint, color, viewMatrix, |
| (const char*)it.glyphs(), textLen, it.pos(), 1, |
| SkPoint::Make(x, y + offset.y())); |
| break; |
| case SkTextBlob::kFull_Positioning: |
| GrTextUtils::DrawBmpPosText(cacheBlob, run, fContext->getBatchFontCache(), |
| fSurfaceProps, runPaint, color, 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(const GrPaint& paint, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| SkScalar x, SkScalar y) { |
| int glyphCount = skPaint.countText(text, byteLength); |
| |
| GrAtlasTextBlob* blob = fCache->createBlob(glyphCount, 1); |
| blob->initThrowawayBlob(viewMatrix, x, y); |
| |
| if (GrTextUtils::CanDrawAsDistanceFields(skPaint, viewMatrix, fSurfaceProps, |
| *fContext->caps()->shaderCaps())) { |
| GrTextUtils::DrawDFText(blob, 0, fContext->getBatchFontCache(), fSurfaceProps, |
| skPaint, paint.getColor(), viewMatrix, text, |
| byteLength, x, y); |
| } else { |
| GrTextUtils::DrawBmpText(blob, 0, fContext->getBatchFontCache(), fSurfaceProps, skPaint, |
| paint.getColor(), viewMatrix, text, byteLength, x, y); |
| } |
| return blob; |
| } |
| |
| inline GrAtlasTextBlob* |
| GrAtlasTextContext::createDrawPosTextBlob(const GrPaint& paint, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| const SkScalar pos[], int scalarsPerPosition, |
| const SkPoint& offset) { |
| int glyphCount = skPaint.countText(text, byteLength); |
| |
| GrAtlasTextBlob* blob = fCache->createBlob(glyphCount, 1); |
| blob->initThrowawayBlob(viewMatrix, offset.x(), offset.y()); |
| |
| if (GrTextUtils::CanDrawAsDistanceFields(skPaint, viewMatrix, fSurfaceProps, |
| *fContext->caps()->shaderCaps())) { |
| GrTextUtils::DrawDFPosText(blob, 0, fContext->getBatchFontCache(), fSurfaceProps, |
| skPaint, paint.getColor(), viewMatrix, text, |
| byteLength, pos, scalarsPerPosition, offset); |
| } else { |
| GrTextUtils::DrawBmpPosText(blob, 0, fContext->getBatchFontCache(), fSurfaceProps, skPaint, |
| paint.getColor(), viewMatrix, text, |
| byteLength, pos, scalarsPerPosition, offset); |
| } |
| return blob; |
| } |
| |
| void GrAtlasTextContext::drawText(GrDrawContext* dc, |
| 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) { |
| if (fContext->abandoned()) { |
| return; |
| } else if (this->canDraw(skPaint, viewMatrix)) { |
| SkAutoTUnref<GrAtlasTextBlob> blob( |
| this->createDrawTextBlob(paint, skPaint, viewMatrix, text, byteLength, x, y)); |
| blob->flushThrowaway(fContext, dc, fSurfaceProps, fDistanceAdjustTable, skPaint, paint, |
| clip, regionClipBounds); |
| return; |
| } |
| |
| // fall back to drawing as a path |
| GrTextUtils::DrawTextAsPath(fContext, dc, clip, skPaint, viewMatrix, text, byteLength, x, y, |
| regionClipBounds); |
| } |
| |
| void GrAtlasTextContext::drawPosText(GrDrawContext* dc, |
| 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) { |
| if (fContext->abandoned()) { |
| return; |
| } else if (this->canDraw(skPaint, viewMatrix)) { |
| SkAutoTUnref<GrAtlasTextBlob> blob( |
| this->createDrawPosTextBlob(paint, skPaint, viewMatrix, |
| text, byteLength, |
| pos, scalarsPerPosition, |
| offset)); |
| blob->flushThrowaway(fContext, dc, fSurfaceProps, fDistanceAdjustTable, skPaint, paint, |
| clip, regionClipBounds); |
| return; |
| } |
| |
| // fall back to drawing as a path |
| GrTextUtils::DrawPosTextAsPath(fContext, dc, fSurfaceProps, 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; |
| |
| // We don't yet test the fall back to paths in the GrTextContext base class. This is mostly |
| // because we don't really want to have a gpu device here. |
| // We enable distance fields by twiddling a knob on the paint |
| gTextContext = GrAtlasTextContext::Create(context, gSurfaceProps); |
| } |
| |
| // Setup dummy SkPaint / GrPaint |
| 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, 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); |
| |
| // Setup clip |
| GrClip clip; |
| |
| // 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( |
| gTextContext->createDrawTextBlob(grPaint, skPaint, viewMatrix, text, |
| static_cast<size_t>(textLen), 0, 0)); |
| |
| // We'd like to be able to test this with random translations, but currently the vertex |
| // bounds and vertices will get out of sync |
| SkScalar transX = 0.f;//SkIntToScalar(random->nextU()); |
| SkScalar transY = 0.f;//SkIntToScalar(random->nextU()); |
| return blob->test_createBatch(textLen, 0, 0, color, transX, transY, skPaint, |
| gSurfaceProps, gTextContext->dfAdjustTable(), |
| context->getBatchFontCache()); |
| } |
| |
| #endif |