| /* | |
| * 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 "GrAtlasTextBlob.h" | |
| #include "GrBatchFlushState.h" | |
| #include "GrTextUtils.h" | |
| #include "SkDistanceFieldGen.h" | |
| #include "SkGlyphCache.h" | |
| #include "batches/GrAtlasTextBatch.h" | |
| //////////////////////////////////////////////////////////////////////////////////////////////////// | |
| // A large template to handle regenerating the vertices of a textblob with as few branches as | |
| // possible | |
| template <bool regenPos, bool regenCol, bool regenTexCoords> | |
| inline void regen_vertices(intptr_t vertex, const GrGlyph* glyph, size_t vertexStride, | |
| bool useDistanceFields, SkScalar transX, SkScalar transY, | |
| int32_t log2Width, int32_t log2Height, | |
| GrColor color) { | |
| int u0, v0, u1, v1; | |
| if (regenTexCoords) { | |
| 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; | |
| } | |
| // normalize | |
| u0 *= 65535; | |
| u0 >>= log2Width; | |
| u1 *= 65535; | |
| u1 >>= log2Width; | |
| v0 *= 65535; | |
| v0 >>= log2Height; | |
| v1 *= 65535; | |
| v1 >>= log2Height; | |
| SkASSERT(u0 >= 0 && u0 <= 65535); | |
| SkASSERT(u1 >= 0 && u1 <= 65535); | |
| SkASSERT(v0 >= 0 && v0 <= 65535); | |
| SkASSERT(v1 >= 0 && v1 <= 65535); | |
| } | |
| // This is a bit wonky, but sometimes we have LCD text, in which case we won't have color | |
| // vertices, hence vertexStride - sizeof(SkIPoint16) | |
| intptr_t colorOffset = sizeof(SkPoint); | |
| intptr_t texCoordOffset = vertexStride - sizeof(SkIPoint16); | |
| // V0 | |
| if (regenPos) { | |
| SkPoint* point = reinterpret_cast<SkPoint*>(vertex); | |
| point->fX += transX; | |
| point->fY += transY; | |
| } | |
| if (regenCol) { | |
| SkColor* vcolor = reinterpret_cast<SkColor*>(vertex + colorOffset); | |
| *vcolor = color; | |
| } | |
| if (regenTexCoords) { | |
| uint16_t* textureCoords = reinterpret_cast<uint16_t*>(vertex + texCoordOffset); | |
| textureCoords[0] = (uint16_t) u0; | |
| textureCoords[1] = (uint16_t) v0; | |
| } | |
| vertex += vertexStride; | |
| // V1 | |
| if (regenPos) { | |
| SkPoint* point = reinterpret_cast<SkPoint*>(vertex); | |
| point->fX += transX; | |
| point->fY += transY; | |
| } | |
| if (regenCol) { | |
| SkColor* vcolor = reinterpret_cast<SkColor*>(vertex + colorOffset); | |
| *vcolor = color; | |
| } | |
| if (regenTexCoords) { | |
| uint16_t* textureCoords = reinterpret_cast<uint16_t*>(vertex + texCoordOffset); | |
| textureCoords[0] = (uint16_t)u0; | |
| textureCoords[1] = (uint16_t)v1; | |
| } | |
| vertex += vertexStride; | |
| // V2 | |
| if (regenPos) { | |
| SkPoint* point = reinterpret_cast<SkPoint*>(vertex); | |
| point->fX += transX; | |
| point->fY += transY; | |
| } | |
| if (regenCol) { | |
| SkColor* vcolor = reinterpret_cast<SkColor*>(vertex + colorOffset); | |
| *vcolor = color; | |
| } | |
| if (regenTexCoords) { | |
| uint16_t* textureCoords = reinterpret_cast<uint16_t*>(vertex + texCoordOffset); | |
| textureCoords[0] = (uint16_t)u1; | |
| textureCoords[1] = (uint16_t)v1; | |
| } | |
| vertex += vertexStride; | |
| // V3 | |
| if (regenPos) { | |
| SkPoint* point = reinterpret_cast<SkPoint*>(vertex); | |
| point->fX += transX; | |
| point->fY += transY; | |
| } | |
| if (regenCol) { | |
| SkColor* vcolor = reinterpret_cast<SkColor*>(vertex + colorOffset); | |
| *vcolor = color; | |
| } | |
| if (regenTexCoords) { | |
| uint16_t* textureCoords = reinterpret_cast<uint16_t*>(vertex + texCoordOffset); | |
| textureCoords[0] = (uint16_t)u1; | |
| textureCoords[1] = (uint16_t)v0; | |
| } | |
| } | |
| template <bool regenPos, bool regenCol, bool regenTexCoords, bool regenGlyphs> | |
| void GrAtlasTextBlob::regenInBatch(GrDrawBatch::Target* target, | |
| GrBatchFontCache* fontCache, | |
| GrBlobRegenHelper *helper, | |
| Run* run, | |
| Run::SubRunInfo* info, | |
| SkAutoGlyphCache* lazyCache, | |
| int glyphCount, size_t vertexStride, | |
| GrColor color, SkScalar transX, | |
| SkScalar transY) const { | |
| SkASSERT(lazyCache); | |
| static_assert(!regenGlyphs || regenTexCoords, "must regenTexCoords along regenGlyphs"); | |
| GrBatchTextStrike* strike = nullptr; | |
| if (regenTexCoords) { | |
| info->resetBulkUseToken(); | |
| const SkDescriptor* desc = (run->fOverrideDescriptor && !info->drawAsDistanceFields()) | |
| ? run->fOverrideDescriptor->getDesc() | |
| : run->fDescriptor.getDesc(); | |
| if (!*lazyCache || (*lazyCache)->getDescriptor() != *desc) { | |
| SkScalerContextEffects effects; | |
| effects.fPathEffect = run->fPathEffect.get(); | |
| effects.fRasterizer = run->fRasterizer.get(); | |
| effects.fMaskFilter = run->fMaskFilter.get(); | |
| lazyCache->reset(SkGlyphCache::DetachCache(run->fTypeface, effects, desc)); | |
| } | |
| if (regenGlyphs) { | |
| strike = fontCache->getStrike(lazyCache->get()); | |
| } else { | |
| strike = info->strike(); | |
| } | |
| } | |
| bool brokenRun = false; | |
| for (int glyphIdx = 0; glyphIdx < glyphCount; glyphIdx++) { | |
| GrGlyph* glyph = nullptr; | |
| int log2Width = 0, log2Height = 0; | |
| if (regenTexCoords) { | |
| size_t glyphOffset = glyphIdx + info->glyphStartIndex(); | |
| if (regenGlyphs) { | |
| // Get the id from the old glyph, and use the new strike to lookup | |
| // the glyph. | |
| GrGlyph::PackedID id = fGlyphs[glyphOffset]->fPackedID; | |
| fGlyphs[glyphOffset] = strike->getGlyph(id, info->maskFormat(), lazyCache->get()); | |
| SkASSERT(id == fGlyphs[glyphOffset]->fPackedID); | |
| } | |
| glyph = fGlyphs[glyphOffset]; | |
| SkASSERT(glyph && glyph->fMaskFormat == info->maskFormat()); | |
| if (!fontCache->hasGlyph(glyph) && | |
| !strike->addGlyphToAtlas(target, glyph, lazyCache->get(), info->maskFormat())) { | |
| helper->flush(); | |
| brokenRun = glyphIdx > 0; | |
| SkDEBUGCODE(bool success =) strike->addGlyphToAtlas(target, | |
| glyph, | |
| lazyCache->get(), | |
| info->maskFormat()); | |
| SkASSERT(success); | |
| } | |
| fontCache->addGlyphToBulkAndSetUseToken(info->bulkUseToken(), glyph, | |
| target->nextDrawToken()); | |
| log2Width = fontCache->log2Width(info->maskFormat()); | |
| log2Height = fontCache->log2Height(info->maskFormat()); | |
| } | |
| intptr_t vertex = reinterpret_cast<intptr_t>(fVertices); | |
| vertex += info->vertexStartIndex(); | |
| vertex += vertexStride * glyphIdx * GrAtlasTextBatch::kVerticesPerGlyph; | |
| regen_vertices<regenPos, regenCol, regenTexCoords>(vertex, glyph, vertexStride, | |
| info->drawAsDistanceFields(), transX, | |
| transY, log2Width, log2Height, color); | |
| helper->incGlyphCount(); | |
| } | |
| // We may have changed the color so update it here | |
| info->setColor(color); | |
| if (regenTexCoords) { | |
| if (regenGlyphs) { | |
| info->setStrike(strike); | |
| } | |
| info->setAtlasGeneration(brokenRun ? GrBatchAtlas::kInvalidAtlasGeneration : | |
| fontCache->atlasGeneration(info->maskFormat())); | |
| } | |
| } | |
| enum RegenMask { | |
| kNoRegen = 0x0, | |
| kRegenPos = 0x1, | |
| kRegenCol = 0x2, | |
| kRegenTex = 0x4, | |
| kRegenGlyph = 0x8 | kRegenTex, // we have to regenerate the texture coords when we regen glyphs | |
| // combinations | |
| kRegenPosCol = kRegenPos | kRegenCol, | |
| kRegenPosTex = kRegenPos | kRegenTex, | |
| kRegenPosTexGlyph = kRegenPos | kRegenGlyph, | |
| kRegenPosColTex = kRegenPos | kRegenCol | kRegenTex, | |
| kRegenPosColTexGlyph = kRegenPos | kRegenCol | kRegenGlyph, | |
| kRegenColTex = kRegenCol | kRegenTex, | |
| kRegenColTexGlyph = kRegenCol | kRegenGlyph, | |
| }; | |
| #define REGEN_ARGS target, fontCache, helper, &run, &info, lazyCache, \ | |
| *glyphCount, vertexStride, color, transX, transY | |
| void GrAtlasTextBlob::regenInBatch(GrDrawBatch::Target* target, | |
| GrBatchFontCache* fontCache, | |
| GrBlobRegenHelper *helper, | |
| int runIndex, int subRunIndex, SkAutoGlyphCache* lazyCache, | |
| size_t vertexStride, const SkMatrix& viewMatrix, | |
| SkScalar x, SkScalar y, GrColor color, | |
| void** vertices, size_t* byteCount, int* glyphCount) { | |
| Run& run = fRuns[runIndex]; | |
| Run::SubRunInfo& info = run.fSubRunInfo[subRunIndex]; | |
| uint64_t currentAtlasGen = fontCache->atlasGeneration(info.maskFormat()); | |
| // Compute translation if any | |
| SkScalar transX, transY; | |
| info.computeTranslation(viewMatrix, x, y, &transX, &transY); | |
| // Because the GrBatchFontCache 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 | |
| bool regenerateGlyphs = info.strike()->isAbandoned(); | |
| bool regenerateTextureCoords = info.atlasGeneration() != currentAtlasGen || | |
| regenerateGlyphs; | |
| bool regenerateColors = kARGB_GrMaskFormat != info.maskFormat() && | |
| info.color() != color; | |
| bool regeneratePositions = transX != 0.f || transY != 0.f; | |
| *glyphCount = info.glyphCount(); | |
| uint32_t regenMaskBits = kNoRegen; | |
| regenMaskBits |= regeneratePositions ? kRegenPos : 0; | |
| regenMaskBits |= regenerateColors ? kRegenCol : 0; | |
| regenMaskBits |= regenerateTextureCoords ? kRegenTex : 0; | |
| regenMaskBits |= regenerateGlyphs ? kRegenGlyph : 0; | |
| RegenMask regenMask = (RegenMask)regenMaskBits; | |
| switch (regenMask) { | |
| case kRegenPos: this->regenInBatch<true, false, false, false>(REGEN_ARGS); break; | |
| case kRegenCol: this->regenInBatch<false, true, false, false>(REGEN_ARGS); break; | |
| case kRegenTex: this->regenInBatch<false, false, true, false>(REGEN_ARGS); break; | |
| case kRegenGlyph: this->regenInBatch<false, false, true, true>(REGEN_ARGS); break; | |
| // combinations | |
| case kRegenPosCol: this->regenInBatch<true, true, false, false>(REGEN_ARGS); break; | |
| case kRegenPosTex: this->regenInBatch<true, false, true, false>(REGEN_ARGS); break; | |
| case kRegenPosTexGlyph: this->regenInBatch<true, false, true, true>(REGEN_ARGS); break; | |
| case kRegenPosColTex: this->regenInBatch<true, true, true, false>(REGEN_ARGS); break; | |
| case kRegenPosColTexGlyph: this->regenInBatch<true, true, true, true>(REGEN_ARGS); break; | |
| case kRegenColTex: this->regenInBatch<false, true, true, false>(REGEN_ARGS); break; | |
| case kRegenColTexGlyph: this->regenInBatch<false, true, true, true>(REGEN_ARGS); break; | |
| case kNoRegen: | |
| helper->incGlyphCount(*glyphCount); | |
| // set use tokens for all of the glyphs in our subrun. This is only valid if we | |
| // have a valid atlas generation | |
| fontCache->setUseTokenBulk(*info.bulkUseToken(), target->nextDrawToken(), | |
| info.maskFormat()); | |
| break; | |
| } | |
| *byteCount = info.byteCount(); | |
| *vertices = fVertices + info.vertexStartIndex(); | |
| } |