| /* |
| * Copyright 2022 Google LLC |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/text/gpu/GlyphVector.h" |
| |
| #include "include/private/chromium/SkChromeRemoteGlyphCache.h" |
| #include "src/core/SkReadBuffer.h" |
| #include "src/core/SkStrikeCache.h" |
| #include "src/core/SkWriteBuffer.h" |
| |
| using MaskFormat = skgpu::MaskFormat; |
| |
| namespace sktext::gpu { |
| |
| GlyphVector::GlyphVector(sk_sp<SkStrike>&& strike, SkSpan<Variant> glyphs) |
| : fSkStrike{std::move(strike)} |
| , fGlyphs{glyphs} { |
| SkASSERT(fSkStrike != nullptr); |
| SkASSERT(fGlyphs.size() > 0); |
| } |
| |
| GlyphVector GlyphVector::Make( |
| sk_sp<SkStrike>&& strike, SkSpan<SkGlyphVariant> glyphs, SubRunAllocator* alloc) { |
| SkASSERT(strike != nullptr); |
| SkASSERT(glyphs.size() > 0); |
| Variant* variants = alloc->makePODArray<Variant>(glyphs.size()); |
| for (auto [i, gv] : SkMakeEnumerate(glyphs)) { |
| variants[i] = gv.glyph()->getPackedID(); |
| } |
| |
| return GlyphVector{std::move(strike), SkMakeSpan(variants, glyphs.size())}; |
| } |
| |
| std::optional<GlyphVector> GlyphVector::MakeFromBuffer(SkReadBuffer& buffer, |
| const SkStrikeClient* client, |
| SubRunAllocator* alloc) { |
| auto descriptor = SkAutoDescriptor::MakeFromBuffer(buffer); |
| if (!buffer.validate(descriptor.has_value())) { return {}; } |
| |
| if (client != nullptr) { |
| if (!client->translateTypefaceID(&descriptor.value())) { return {}; } |
| } |
| |
| sk_sp<SkStrike> strike = SkStrikeCache::GlobalStrikeCache()->findStrike(*descriptor->getDesc()); |
| if (!buffer.validate(strike != nullptr)) { return {}; } |
| |
| int32_t glyphCount = buffer.read32(); |
| // Since the glyph count can never be zero. There was a buffer reading problem. |
| if (!buffer.validate(glyphCount > 0)) { return {}; } |
| |
| // Make sure we can multiply without overflow in the check below. |
| static constexpr int kMaxCount = (int)(INT_MAX / sizeof(uint32_t)); |
| if (!buffer.validate(glyphCount <= kMaxCount)) { return {}; } |
| |
| // Check for enough bytes to populate the packedGlyphID array. If not enough something has |
| // gone wrong. |
| if (!buffer.validate(glyphCount * sizeof(uint32_t) <= buffer.available())) { return {}; } |
| |
| Variant* variants = alloc->makePODArray<Variant>(glyphCount); |
| for (int i = 0; i < glyphCount; i++) { |
| variants[i].packedGlyphID = SkPackedGlyphID(buffer.readUInt()); |
| } |
| return {GlyphVector{std::move(strike), SkMakeSpan(variants, glyphCount)}}; |
| } |
| |
| void GlyphVector::flatten(SkWriteBuffer& buffer) { |
| // There should never be a glyph vector with zero glyphs. |
| SkASSERT(fGlyphs.size() != 0); |
| if (!fSkStrike) { SK_ABORT("Can't flatten with already drawn."); } |
| |
| fSkStrike->getDescriptor().flatten(buffer); |
| |
| // Write out the span of packedGlyphIDs. |
| buffer.write32(SkTo<int32_t>(fGlyphs.size())); |
| for (auto variant : fGlyphs) { |
| buffer.writeUInt(variant.packedGlyphID.value()); |
| } |
| } |
| |
| SkSpan<const Glyph*> GlyphVector::glyphs() const { |
| return SkMakeSpan(reinterpret_cast<const Glyph**>(fGlyphs.data()), fGlyphs.size()); |
| } |
| |
| // packedGlyphIDToGlyph must be run in single-threaded mode. |
| // If fSkStrike != nullptr then the conversion to Glyph* has not happened. |
| void GlyphVector::packedGlyphIDToGlyph(StrikeCache* cache) { |
| if (fSkStrike != nullptr) { |
| fTextStrike = cache->findOrCreateStrike(fSkStrike->strikeSpec()); |
| |
| for (auto& variant : fGlyphs) { |
| variant.glyph = fTextStrike->getGlyph(variant.packedGlyphID); |
| } |
| |
| // This must be pinned for the Atlas filling to work. |
| fSkStrike->verifyPinnedStrike(); |
| |
| // Drop the ref on the strike that was taken in the SkGlyphRunPainter process* methods. |
| fSkStrike = nullptr; |
| } |
| } |
| |
| } // namespace sktext::gpu |