| /* |
| * 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 "src/core/SkDistanceFieldGen.h" |
| #include "src/gpu/ops/GrAtlasTextOp.h" |
| #include "src/gpu/text/GrAtlasManager.h" |
| #include "src/gpu/text/GrTextBlob.h" |
| #include "src/gpu/text/GrTextTarget.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* lazyStrike) |
| : fResourceProvider(resourceProvider) |
| , fViewMatrix(viewMatrix) |
| , fBlob(blob) |
| , fUploadTarget(uploadTarget) |
| , fGlyphCache(glyphCache) |
| , fFullAtlasManager(fullAtlasManager) |
| , fLazyStrike(lazyStrike) |
| , 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 SkStrikeSpec& strikeSpec = fSubRun->strikeSpec(); |
| |
| if (!*fLazyStrike || (*fLazyStrike)->getDescriptor() != strikeSpec.descriptor()) { |
| *fLazyStrike = |
| strikeSpec.findOrCreateExclusiveStrike(SkStrikeCache::GlobalStrikeCache()); |
| } |
| |
| if (regenGlyphs) { |
| strike = strikeSpec.findOrCreateGrStrike(fGlyphCache); |
| } 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, fLazyStrike->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, |
| fLazyStrike->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"); |
| } |
