| /* | |
| * Copyright 2016 Google Inc. | |
| * | |
| * Use of this source code is governed by a BSD-style license that can be | |
| * found in the LICENSE file. | |
| */ | |
| #include "GrAtlasManager.h" | |
| #include "GrTextBlob.h" | |
| #include "GrTextTarget.h" | |
| #include "SkDistanceFieldGen.h" | |
| #include "ops/GrAtlasTextOp.h" | |
| enum RegenMask { | |
| kNoRegen = 0x0, | |
| kRegenPos = 0x1, | |
| kRegenCol = 0x2, | |
| kRegenTex = 0x4, | |
| kRegenGlyph = 0x8, | |
| }; | |
| //////////////////////////////////////////////////////////////////////////////////////////////////// | |
| static void regen_positions(char* vertex, size_t vertexStride, SkScalar transX, SkScalar transY) { | |
| SkPoint* point = reinterpret_cast<SkPoint*>(vertex); | |
| for (int i = 0; i < 4; ++i) { | |
| point->fX += transX; | |
| point->fY += transY; | |
| point = SkTAddOffset<SkPoint>(point, vertexStride); | |
| } | |
| } | |
| static void regen_colors(char* vertex, size_t vertexStride, GrColor color) { | |
| // This is a bit wonky, but sometimes we have LCD text, in which case we won't have color | |
| // vertices, hence vertexStride - sizeof(SkIPoint16) | |
| size_t colorOffset = vertexStride - sizeof(SkIPoint16) - sizeof(GrColor); | |
| GrColor* vcolor = reinterpret_cast<GrColor*>(vertex + colorOffset); | |
| for (int i = 0; i < 4; ++i) { | |
| *vcolor = color; | |
| vcolor = SkTAddOffset<GrColor>(vcolor, vertexStride); | |
| } | |
| } | |
| static void regen_texcoords(char* vertex, size_t vertexStride, const GrGlyph* glyph, | |
| bool useDistanceFields) { | |
| // This is a bit wonky, but sometimes we have LCD text, in which case we won't have color | |
| // vertices, hence vertexStride - sizeof(SkIPoint16) | |
| size_t texCoordOffset = vertexStride - sizeof(SkIPoint16); | |
| uint16_t u0, v0, u1, v1; | |
| SkASSERT(glyph); | |
| int width = glyph->fBounds.width(); | |
| int height = glyph->fBounds.height(); | |
| if (useDistanceFields) { | |
| u0 = glyph->fAtlasLocation.fX + SK_DistanceFieldInset; | |
| v0 = glyph->fAtlasLocation.fY + SK_DistanceFieldInset; | |
| u1 = u0 + width - 2 * SK_DistanceFieldInset; | |
| v1 = v0 + height - 2 * SK_DistanceFieldInset; | |
| } else { | |
| u0 = glyph->fAtlasLocation.fX; | |
| v0 = glyph->fAtlasLocation.fY; | |
| u1 = u0 + width; | |
| v1 = v0 + height; | |
| } | |
| // We pack the 2bit page index in the low bit of the u and v texture coords | |
| uint32_t pageIndex = glyph->pageIndex(); | |
| SkASSERT(pageIndex < 4); | |
| uint16_t uBit = (pageIndex >> 1) & 0x1; | |
| uint16_t vBit = pageIndex & 0x1; | |
| u0 <<= 1; | |
| u0 |= uBit; | |
| v0 <<= 1; | |
| v0 |= vBit; | |
| u1 <<= 1; | |
| u1 |= uBit; | |
| v1 <<= 1; | |
| v1 |= vBit; | |
| uint16_t* textureCoords = reinterpret_cast<uint16_t*>(vertex + texCoordOffset); | |
| textureCoords[0] = u0; | |
| textureCoords[1] = v0; | |
| textureCoords = SkTAddOffset<uint16_t>(textureCoords, vertexStride); | |
| textureCoords[0] = u0; | |
| textureCoords[1] = v1; | |
| textureCoords = SkTAddOffset<uint16_t>(textureCoords, vertexStride); | |
| textureCoords[0] = u1; | |
| textureCoords[1] = v0; | |
| textureCoords = SkTAddOffset<uint16_t>(textureCoords, vertexStride); | |
| textureCoords[0] = u1; | |
| textureCoords[1] = v1; | |
| #ifdef DISPLAY_PAGE_INDEX | |
| // Enable this to visualize the page from which each glyph is being drawn. | |
| // Green Red Magenta Cyan -> 0 1 2 3; Black -> error | |
| GrColor hackColor; | |
| switch (pageIndex) { | |
| case 0: | |
| hackColor = GrColorPackRGBA(0, 255, 0, 255); | |
| break; | |
| case 1: | |
| hackColor = GrColorPackRGBA(255, 0, 0, 255);; | |
| break; | |
| case 2: | |
| hackColor = GrColorPackRGBA(255, 0, 255, 255); | |
| break; | |
| case 3: | |
| hackColor = GrColorPackRGBA(0, 255, 255, 255); | |
| break; | |
| default: | |
| hackColor = GrColorPackRGBA(0, 0, 0, 255); | |
| break; | |
| } | |
| regen_colors(vertex, vertexStride, hackColor); | |
| #endif | |
| } | |
| GrTextBlob::VertexRegenerator::VertexRegenerator(GrResourceProvider* resourceProvider, | |
| GrTextBlob* blob, | |
| int runIdx, int subRunIdx, | |
| const SkMatrix& viewMatrix, SkScalar x, SkScalar y, | |
| GrColor color, | |
| GrDeferredUploadTarget* uploadTarget, | |
| GrStrikeCache* glyphCache, | |
| GrAtlasManager* fullAtlasManager, | |
| SkExclusiveStrikePtr* lazyCache) | |
| : fResourceProvider(resourceProvider) | |
| , fViewMatrix(viewMatrix) | |
| , fBlob(blob) | |
| , fUploadTarget(uploadTarget) | |
| , fGlyphCache(glyphCache) | |
| , fFullAtlasManager(fullAtlasManager) | |
| , fLazyCache(lazyCache) | |
| , fRun(&blob->fRuns[runIdx]) | |
| , fSubRun(&blob->fRuns[runIdx].fSubRunInfo[subRunIdx]) | |
| , fColor(color) { | |
| // Compute translation if any | |
| fSubRun->computeTranslation(fViewMatrix, x, y, &fTransX, &fTransY); | |
| // Because the GrStrikeCache may evict the strike a blob depends on using for | |
| // generating its texture coords, we have to track whether or not the strike has | |
| // been abandoned. If it hasn't been abandoned, then we can use the GrGlyph*s as is | |
| // otherwise we have to get the new strike, and use that to get the correct glyphs. | |
| // Because we do not have the packed ids, and thus can't look up our glyphs in the | |
| // new strike, we instead keep our ref to the old strike and use the packed ids from | |
| // it. These ids will still be valid as long as we hold the ref. When we are done | |
| // updating our cache of the GrGlyph*s, we drop our ref on the old strike | |
| if (fSubRun->strike()->isAbandoned()) { | |
| fRegenFlags |= kRegenGlyph; | |
| fRegenFlags |= kRegenTex; | |
| } | |
| if (kARGB_GrMaskFormat != fSubRun->maskFormat() && fSubRun->color() != color) { | |
| fRegenFlags |= kRegenCol; | |
| } | |
| if (0.f != fTransX || 0.f != fTransY) { | |
| fRegenFlags |= kRegenPos; | |
| } | |
| } | |
| bool GrTextBlob::VertexRegenerator::doRegen(GrTextBlob::VertexRegenerator::Result* result, | |
| bool regenPos, bool regenCol, bool regenTexCoords, | |
| bool regenGlyphs) { | |
| SkASSERT(!regenGlyphs || regenTexCoords); | |
| sk_sp<GrTextStrike> strike; | |
| if (regenTexCoords) { | |
| fSubRun->resetBulkUseToken(); | |
| const SkDescriptor* desc = fSubRun->desc(); | |
| if (!*fLazyCache || (*fLazyCache)->getDescriptor() != *desc) { | |
| SkScalerContextEffects effects; | |
| effects.fPathEffect = fRun->fPathEffect.get(); | |
| effects.fMaskFilter = fRun->fMaskFilter.get(); | |
| *fLazyCache = | |
| SkStrikeCache::FindOrCreateStrikeExclusive(*desc, effects, *fRun->fTypeface); | |
| } | |
| if (regenGlyphs) { | |
| strike = fGlyphCache->getStrike((*fLazyCache)->getDescriptor()); | |
| } else { | |
| strike = fSubRun->refStrike(); | |
| } | |
| } | |
| bool hasW = fSubRun->hasWCoord(); | |
| auto vertexStride = GetVertexStride(fSubRun->maskFormat(), hasW); | |
| char* currVertex = fBlob->fVertices + fSubRun->vertexStartIndex() + | |
| fCurrGlyph * kVerticesPerGlyph * vertexStride; | |
| result->fFirstVertex = currVertex; | |
| for (int glyphIdx = fCurrGlyph; glyphIdx < (int)fSubRun->glyphCount(); glyphIdx++) { | |
| GrGlyph* glyph = nullptr; | |
| if (regenTexCoords) { | |
| size_t glyphOffset = glyphIdx + fSubRun->glyphStartIndex(); | |
| if (regenGlyphs) { | |
| // Get the id from the old glyph, and use the new strike to lookup | |
| // the glyph. | |
| SkPackedGlyphID id = fBlob->fGlyphs[glyphOffset]->fPackedID; | |
| fBlob->fGlyphs[glyphOffset] = strike->getGlyph(id, fLazyCache->get()); | |
| SkASSERT(id == fBlob->fGlyphs[glyphOffset]->fPackedID); | |
| } | |
| glyph = fBlob->fGlyphs[glyphOffset]; | |
| SkASSERT(glyph && glyph->fMaskFormat == fSubRun->maskFormat()); | |
| if (!fFullAtlasManager->hasGlyph(glyph)) { | |
| GrDrawOpAtlas::ErrorCode code; | |
| code = strike->addGlyphToAtlas(fResourceProvider, fUploadTarget, fGlyphCache, | |
| fFullAtlasManager, glyph, | |
| fLazyCache->get(), fSubRun->maskFormat(), | |
| fSubRun->needsTransform()); | |
| if (GrDrawOpAtlas::ErrorCode::kError == code) { | |
| // Something horrible has happened - drop the op | |
| return false; | |
| } | |
| else if (GrDrawOpAtlas::ErrorCode::kTryAgain == code) { | |
| fBrokenRun = glyphIdx > 0; | |
| result->fFinished = false; | |
| return true; | |
| } | |
| } | |
| auto tokenTracker = fUploadTarget->tokenTracker(); | |
| fFullAtlasManager->addGlyphToBulkAndSetUseToken(fSubRun->bulkUseToken(), glyph, | |
| tokenTracker->nextDrawToken()); | |
| } | |
| if (regenPos) { | |
| regen_positions(currVertex, vertexStride, fTransX, fTransY); | |
| } | |
| if (regenCol) { | |
| regen_colors(currVertex, vertexStride, fColor); | |
| } | |
| if (regenTexCoords) { | |
| regen_texcoords(currVertex, vertexStride, glyph, fSubRun->drawAsDistanceFields()); | |
| } | |
| currVertex += vertexStride * GrAtlasTextOp::kVerticesPerGlyph; | |
| ++result->fGlyphsRegenerated; | |
| ++fCurrGlyph; | |
| } | |
| // We may have changed the color so update it here | |
| fSubRun->setColor(fColor); | |
| if (regenTexCoords) { | |
| if (regenGlyphs) { | |
| fSubRun->setStrike(std::move(strike)); | |
| } | |
| fSubRun->setAtlasGeneration(fBrokenRun | |
| ? GrDrawOpAtlas::kInvalidAtlasGeneration | |
| : fFullAtlasManager->atlasGeneration(fSubRun->maskFormat())); | |
| } else { | |
| // For the non-texCoords case we need to ensure that we update the associated use tokens | |
| fFullAtlasManager->setUseTokenBulk(*fSubRun->bulkUseToken(), | |
| fUploadTarget->tokenTracker()->nextDrawToken(), | |
| fSubRun->maskFormat()); | |
| } | |
| return true; | |
| } | |
| bool GrTextBlob::VertexRegenerator::regenerate(GrTextBlob::VertexRegenerator::Result* result) { | |
| uint64_t currentAtlasGen = fFullAtlasManager->atlasGeneration(fSubRun->maskFormat()); | |
| // If regenerate() is called multiple times then the atlas gen may have changed. So we check | |
| // this each time. | |
| if (fSubRun->atlasGeneration() != currentAtlasGen) { | |
| fRegenFlags |= kRegenTex; | |
| } | |
| if (fRegenFlags) { | |
| return this->doRegen(result, | |
| fRegenFlags & kRegenPos, | |
| fRegenFlags & kRegenCol, | |
| fRegenFlags & kRegenTex, | |
| fRegenFlags & kRegenGlyph); | |
| } else { | |
| bool hasW = fSubRun->hasWCoord(); | |
| auto vertexStride = GetVertexStride(fSubRun->maskFormat(), hasW); | |
| result->fFinished = true; | |
| result->fGlyphsRegenerated = fSubRun->glyphCount() - fCurrGlyph; | |
| result->fFirstVertex = fBlob->fVertices + fSubRun->vertexStartIndex() + | |
| fCurrGlyph * kVerticesPerGlyph * vertexStride; | |
| fCurrGlyph = fSubRun->glyphCount(); | |
| // set use tokens for all of the glyphs in our subrun. This is only valid if we | |
| // have a valid atlas generation | |
| fFullAtlasManager->setUseTokenBulk(*fSubRun->bulkUseToken(), | |
| fUploadTarget->tokenTracker()->nextDrawToken(), | |
| fSubRun->maskFormat()); | |
| return true; | |
| } | |
| SK_ABORT("Should not get here"); | |
| return false; | |
| } |