| /* |
| * Copyright 2018 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/SkRemoteGlyphCache.h" |
| |
| #include <iterator> |
| #include <memory> |
| #include <new> |
| #include <string> |
| #include <tuple> |
| |
| #include "src/core/SkDevice.h" |
| #include "src/core/SkDraw.h" |
| #include "src/core/SkGlyphRun.h" |
| #include "src/core/SkStrike.h" |
| #include "src/core/SkStrikeCache.h" |
| #include "src/core/SkTLazy.h" |
| #include "src/core/SkTraceEvent.h" |
| #include "src/core/SkTypeface_remote.h" |
| |
| #if SK_SUPPORT_GPU |
| #include "src/gpu/GrDrawOpAtlas.h" |
| #include "src/gpu/text/GrTextContext.h" |
| #endif |
| |
| static SkDescriptor* auto_descriptor_from_desc(const SkDescriptor* source_desc, |
| SkFontID font_id, |
| SkAutoDescriptor* ad) { |
| ad->reset(source_desc->getLength()); |
| auto* desc = ad->getDesc(); |
| desc->init(); |
| |
| // Rec. |
| { |
| uint32_t size; |
| auto ptr = source_desc->findEntry(kRec_SkDescriptorTag, &size); |
| SkScalerContextRec rec; |
| std::memcpy(&rec, ptr, size); |
| rec.fFontID = font_id; |
| desc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec); |
| } |
| |
| // Effects. |
| { |
| uint32_t size; |
| auto ptr = source_desc->findEntry(kEffects_SkDescriptorTag, &size); |
| if (ptr) { desc->addEntry(kEffects_SkDescriptorTag, size, ptr); } |
| } |
| |
| desc->computeChecksum(); |
| return desc; |
| } |
| |
| static const SkDescriptor* create_descriptor( |
| const SkPaint& paint, const SkFont& font, const SkMatrix& m, |
| const SkSurfaceProps& props, SkScalerContextFlags flags, |
| SkAutoDescriptor* ad, SkScalerContextEffects* effects) { |
| SkScalerContextRec rec; |
| SkScalerContext::MakeRecAndEffects(font, paint, props, flags, m, &rec, effects); |
| return SkScalerContext::AutoDescriptorGivenRecAndEffects(rec, *effects, ad); |
| } |
| |
| // -- Serializer ----------------------------------------------------------------------------------- |
| size_t pad(size_t size, size_t alignment) { return (size + (alignment - 1)) & ~(alignment - 1); } |
| |
| // Alignment between x86 and x64 differs for some types, in particular |
| // int64_t and doubles have 4 and 8-byte alignment, respectively. |
| // Be consistent even when writing and reading across different architectures. |
| template<typename T> |
| size_t serialization_alignment() { |
| return sizeof(T) == 8 ? 8 : alignof(T); |
| } |
| |
| class Serializer { |
| public: |
| Serializer(std::vector<uint8_t>* buffer) : fBuffer{buffer} { } |
| |
| template <typename T, typename... Args> |
| T* emplace(Args&&... args) { |
| auto result = allocate(sizeof(T), serialization_alignment<T>()); |
| return new (result) T{std::forward<Args>(args)...}; |
| } |
| |
| template <typename T> |
| void write(const T& data) { |
| T* result = (T*)allocate(sizeof(T), serialization_alignment<T>()); |
| memcpy(result, &data, sizeof(T)); |
| } |
| |
| template <typename T> |
| T* allocate() { |
| T* result = (T*)allocate(sizeof(T), serialization_alignment<T>()); |
| return result; |
| } |
| |
| void writeDescriptor(const SkDescriptor& desc) { |
| write(desc.getLength()); |
| auto result = allocate(desc.getLength(), alignof(SkDescriptor)); |
| memcpy(result, &desc, desc.getLength()); |
| } |
| |
| void* allocate(size_t size, size_t alignment) { |
| size_t aligned = pad(fBuffer->size(), alignment); |
| fBuffer->resize(aligned + size); |
| return &(*fBuffer)[aligned]; |
| } |
| |
| private: |
| std::vector<uint8_t>* fBuffer; |
| }; |
| |
| // -- Deserializer ------------------------------------------------------------------------------- |
| // Note that the Deserializer is reading untrusted data, we need to guard against invalid data. |
| class Deserializer { |
| public: |
| Deserializer(const volatile char* memory, size_t memorySize) |
| : fMemory(memory), fMemorySize(memorySize) {} |
| |
| template <typename T> |
| bool read(T* val) { |
| auto* result = this->ensureAtLeast(sizeof(T), serialization_alignment<T>()); |
| if (!result) return false; |
| |
| memcpy(val, const_cast<const char*>(result), sizeof(T)); |
| return true; |
| } |
| |
| bool readDescriptor(SkAutoDescriptor* ad) { |
| uint32_t descLength = 0u; |
| if (!read<uint32_t>(&descLength)) return false; |
| if (descLength < sizeof(SkDescriptor)) return false; |
| if (descLength != SkAlign4(descLength)) return false; |
| |
| auto* result = this->ensureAtLeast(descLength, alignof(SkDescriptor)); |
| if (!result) return false; |
| |
| ad->reset(descLength); |
| memcpy(ad->getDesc(), const_cast<const char*>(result), descLength); |
| |
| if (ad->getDesc()->getLength() > descLength) return false; |
| return ad->getDesc()->isValid(); |
| } |
| |
| const volatile void* read(size_t size, size_t alignment) { |
| return this->ensureAtLeast(size, alignment); |
| } |
| |
| size_t bytesRead() const { return fBytesRead; } |
| |
| private: |
| const volatile char* ensureAtLeast(size_t size, size_t alignment) { |
| size_t padded = pad(fBytesRead, alignment); |
| |
| // Not enough data. |
| if (padded > fMemorySize) return nullptr; |
| if (size > fMemorySize - padded) return nullptr; |
| |
| auto* result = fMemory + padded; |
| fBytesRead = padded + size; |
| return result; |
| } |
| |
| // Note that we read each piece of memory only once to guard against TOCTOU violations. |
| const volatile char* fMemory; |
| size_t fMemorySize; |
| size_t fBytesRead = 0u; |
| }; |
| |
| // Paths use a SkWriter32 which requires 4 byte alignment. |
| static const size_t kPathAlignment = 4u; |
| |
| // -- StrikeSpec ----------------------------------------------------------------------------------- |
| struct StrikeSpec { |
| StrikeSpec() = default; |
| StrikeSpec(SkFontID typefaceID_, SkDiscardableHandleId discardableHandleId_) |
| : typefaceID{typefaceID_}, discardableHandleId(discardableHandleId_) {} |
| SkFontID typefaceID = 0u; |
| SkDiscardableHandleId discardableHandleId = 0u; |
| /* desc */ |
| /* n X (glyphs ids) */ |
| }; |
| |
| // -- RemoteStrike ---------------------------------------------------------------------------- |
| class SkStrikeServer::RemoteStrike : public SkStrikeForGPU { |
| public: |
| // N.B. RemoteStrike is not valid until ensureScalerContext is called. |
| RemoteStrike(const SkDescriptor& descriptor, |
| std::unique_ptr<SkScalerContext> context, |
| SkDiscardableHandleId discardableHandleId); |
| ~RemoteStrike() override; |
| |
| void addGlyph(SkPackedGlyphID, bool asPath); |
| void writePendingGlyphs(Serializer* serializer); |
| SkDiscardableHandleId discardableHandleId() const { return fDiscardableHandleId; } |
| |
| const SkDescriptor& getDescriptor() const override { |
| return *fDescriptor.getDesc(); |
| } |
| |
| void setTypefaceAndEffects(const SkTypeface* typeface, SkScalerContextEffects effects); |
| |
| const SkGlyphPositionRoundingSpec& roundingSpec() const override { |
| return fRoundingSpec; |
| } |
| |
| SkSpan<const SkGlyphPos> |
| prepareForDrawingRemoveEmpty( |
| const SkPackedGlyphID packedGlyphIDs[], |
| const SkPoint positions[], size_t n, |
| int maxDimension, |
| SkGlyphPos results[]) override; |
| |
| void onAboutToExitScope() override {} |
| |
| bool hasPendingGlyphs() const { |
| return !fPendingGlyphImages.empty() || !fPendingGlyphPaths.empty(); |
| } |
| |
| void resetScalerContext(); |
| |
| private: |
| void writeGlyphPath(const SkPackedGlyphID& glyphID, Serializer* serializer) const; |
| |
| void ensureScalerContext(); |
| |
| // The set of glyphs cached on the remote client. |
| SkTHashSet<SkPackedGlyphID> fCachedGlyphImages; |
| SkTHashSet<SkPackedGlyphID> fCachedGlyphPaths; |
| |
| // The set of glyphs which has not yet been serialized and sent to the |
| // remote client. |
| std::vector<SkPackedGlyphID> fPendingGlyphImages; |
| std::vector<SkPackedGlyphID> fPendingGlyphPaths; |
| |
| const SkAutoDescriptor fDescriptor; |
| |
| const SkDiscardableHandleId fDiscardableHandleId; |
| |
| const SkGlyphPositionRoundingSpec fRoundingSpec; |
| |
| // The context built using fDescriptor |
| std::unique_ptr<SkScalerContext> fContext; |
| |
| // These fields are set every time getOrCreateCache. This allows the code to maintain the |
| // fContext as lazy as possible. |
| const SkTypeface* fTypeface{nullptr}; |
| SkScalerContextEffects fEffects; |
| |
| bool fHaveSentFontMetrics{false}; |
| |
| class GlyphMapHashTraits { |
| public: |
| static SkPackedGlyphID GetKey(const SkGlyph* glyph) { |
| return glyph->getPackedID(); |
| } |
| static uint32_t Hash(SkPackedGlyphID glyphId) { |
| return glyphId.hash(); |
| } |
| }; |
| |
| // FallbackTextHelper cases require glyph metrics when analyzing a glyph run, in which case |
| // we cache them here. |
| SkTHashTable<SkGlyph*, SkPackedGlyphID, GlyphMapHashTraits> fGlyphMap; |
| |
| SkArenaAlloc fAlloc{256}; |
| }; |
| |
| SkStrikeServer::RemoteStrike::RemoteStrike( |
| const SkDescriptor& descriptor, |
| std::unique_ptr<SkScalerContext> context, |
| uint32_t discardableHandleId) |
| : fDescriptor{descriptor} |
| , fDiscardableHandleId(discardableHandleId) |
| , fRoundingSpec{context->isSubpixel(), context->computeAxisAlignmentForHText()} |
| // N.B. context must come last because it is used above. |
| , fContext{std::move(context)} { |
| SkASSERT(fDescriptor.getDesc() != nullptr); |
| SkASSERT(fContext != nullptr); |
| } |
| |
| SkStrikeServer::RemoteStrike::~RemoteStrike() = default; |
| |
| void SkStrikeServer::RemoteStrike::addGlyph(SkPackedGlyphID glyph, bool asPath) { |
| auto* cache = asPath ? &fCachedGlyphPaths : &fCachedGlyphImages; |
| auto* pending = asPath ? &fPendingGlyphPaths : &fPendingGlyphImages; |
| |
| // Already cached. |
| if (cache->contains(glyph)) { |
| return; |
| } |
| |
| // A glyph is going to be sent. Make sure we have a scaler context to send it. |
| this->ensureScalerContext(); |
| |
| // Serialize and cache. Also create the scalar context to use when serializing |
| // this glyph. |
| cache->add(glyph); |
| pending->push_back(glyph); |
| } |
| |
| size_t SkStrikeServer::MapOps::operator()(const SkDescriptor* key) const { |
| return key->getChecksum(); |
| } |
| |
| bool SkStrikeServer::MapOps::operator()(const SkDescriptor* lhs, const SkDescriptor* rhs) const { |
| return *lhs == *rhs; |
| } |
| |
| |
| // -- TrackLayerDevice ----------------------------------------------------------------------------- |
| class SkTextBlobCacheDiffCanvas::TrackLayerDevice final : public SkNoPixelsDevice { |
| public: |
| TrackLayerDevice( |
| const SkIRect& bounds, const SkSurfaceProps& props, SkStrikeServer* server, |
| sk_sp<SkColorSpace> colorSpace, bool DFTSupport) |
| : SkNoPixelsDevice(bounds, props, std::move(colorSpace)) |
| , fStrikeServer(server) |
| , fDFTSupport(DFTSupport) |
| , fPainter{props, kUnknown_SkColorType, imageInfo().colorSpace(), fStrikeServer} { |
| SkASSERT(fStrikeServer != nullptr); |
| } |
| |
| SkBaseDevice* onCreateDevice(const CreateInfo& cinfo, const SkPaint*) override { |
| const SkSurfaceProps surfaceProps(this->surfaceProps().flags(), cinfo.fPixelGeometry); |
| return new TrackLayerDevice(this->getGlobalBounds(), surfaceProps, fStrikeServer, |
| cinfo.fInfo.refColorSpace(), fDFTSupport); |
| } |
| |
| protected: |
| void drawGlyphRunList(const SkGlyphRunList& glyphRunList) override { |
| #if SK_SUPPORT_GPU |
| GrTextContext::Options options; |
| GrTextContext::SanitizeOptions(&options); |
| |
| fPainter.processGlyphRunList(glyphRunList, |
| this->ctm(), |
| this->surfaceProps(), |
| fDFTSupport, |
| options, |
| nullptr); |
| #endif // SK_SUPPORT_GPU |
| } |
| |
| private: |
| SkStrikeServer* const fStrikeServer; |
| const bool fDFTSupport{false}; |
| SkGlyphRunListPainter fPainter; |
| }; |
| |
| // -- SkTextBlobCacheDiffCanvas ------------------------------------------------------------------- |
| SkTextBlobCacheDiffCanvas::SkTextBlobCacheDiffCanvas(int width, int height, |
| const SkSurfaceProps& props, |
| SkStrikeServer* strikeServer, |
| bool DFTSupport) |
| : SkTextBlobCacheDiffCanvas{width, height, props, strikeServer, nullptr, DFTSupport} { } |
| |
| SkTextBlobCacheDiffCanvas::SkTextBlobCacheDiffCanvas(int width, int height, |
| const SkSurfaceProps& props, |
| SkStrikeServer* strikeServer, |
| sk_sp<SkColorSpace> colorSpace, |
| bool DFTSupport) |
| : SkNoDrawCanvas{sk_make_sp<TrackLayerDevice>(SkIRect::MakeWH(width, height), |
| props, |
| strikeServer, |
| std::move(colorSpace), |
| DFTSupport)} { } |
| |
| SkTextBlobCacheDiffCanvas::~SkTextBlobCacheDiffCanvas() = default; |
| |
| SkCanvas::SaveLayerStrategy SkTextBlobCacheDiffCanvas::getSaveLayerStrategy( |
| const SaveLayerRec& rec) { |
| return kFullLayer_SaveLayerStrategy; |
| } |
| |
| bool SkTextBlobCacheDiffCanvas::onDoSaveBehind(const SkRect*) { |
| return false; |
| } |
| |
| void SkTextBlobCacheDiffCanvas::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y, |
| const SkPaint& paint) { |
| SkCanvas::onDrawTextBlob(blob, x, y, paint); |
| } |
| |
| // -- WireTypeface --------------------------------------------------------------------------------- |
| struct WireTypeface { |
| WireTypeface() = default; |
| WireTypeface(SkFontID typeface_id, int glyph_count, SkFontStyle style, bool is_fixed) |
| : typefaceID(typeface_id), glyphCount(glyph_count), style(style), isFixed(is_fixed) {} |
| |
| SkFontID typefaceID{0}; |
| int glyphCount{0}; |
| SkFontStyle style; |
| bool isFixed{false}; |
| }; |
| |
| // SkStrikeServer ---------------------------------------------------------------------------------- |
| SkStrikeServer::SkStrikeServer(DiscardableHandleManager* discardableHandleManager) |
| : fDiscardableHandleManager(discardableHandleManager) { |
| SkASSERT(fDiscardableHandleManager); |
| } |
| |
| SkStrikeServer::~SkStrikeServer() = default; |
| |
| sk_sp<SkData> SkStrikeServer::serializeTypeface(SkTypeface* tf) { |
| auto* data = fSerializedTypefaces.find(SkTypeface::UniqueID(tf)); |
| if (data) { |
| return *data; |
| } |
| |
| WireTypeface wire(SkTypeface::UniqueID(tf), tf->countGlyphs(), tf->fontStyle(), |
| tf->isFixedPitch()); |
| data = fSerializedTypefaces.set(SkTypeface::UniqueID(tf), |
| SkData::MakeWithCopy(&wire, sizeof(wire))); |
| return *data; |
| } |
| |
| void SkStrikeServer::writeStrikeData(std::vector<uint8_t>* memory) { |
| size_t strikesToSend = 0; |
| fRemoteStrikesToSend.foreach ([&strikesToSend](RemoteStrike* strike) { |
| if (strike->hasPendingGlyphs()) { |
| strikesToSend++; |
| } else { |
| strike->resetScalerContext(); |
| } |
| }); |
| |
| if (strikesToSend == 0 && fTypefacesToSend.empty()) { |
| fRemoteStrikesToSend.reset(); |
| return; |
| } |
| |
| Serializer serializer(memory); |
| serializer.emplace<uint64_t>(fTypefacesToSend.size()); |
| for (const auto& tf : fTypefacesToSend) { |
| serializer.write<WireTypeface>(tf); |
| } |
| fTypefacesToSend.clear(); |
| |
| serializer.emplace<uint64_t>(SkTo<uint64_t>(strikesToSend)); |
| fRemoteStrikesToSend.foreach ( |
| #ifdef SK_DEBUG |
| [&serializer, this](RemoteStrike* strike) { |
| if (strike->hasPendingGlyphs()) { |
| strike->writePendingGlyphs(&serializer); |
| strike->resetScalerContext(); |
| } |
| auto it = fDescToRemoteStrike.find(&strike->getDescriptor()); |
| SkASSERT(it != fDescToRemoteStrike.end()); |
| SkASSERT(it->second.get() == strike); |
| } |
| |
| #else |
| [&serializer](RemoteStrike* strike) { |
| if (strike->hasPendingGlyphs()) { |
| strike->writePendingGlyphs(&serializer); |
| strike->resetScalerContext(); |
| } |
| } |
| #endif |
| ); |
| fRemoteStrikesToSend.reset(); |
| } |
| |
| SkStrikeServer::RemoteStrike* SkStrikeServer::getOrCreateCache( |
| const SkPaint& paint, |
| const SkFont& font, |
| const SkSurfaceProps& props, |
| const SkMatrix& matrix, |
| SkScalerContextFlags flags, |
| SkScalerContextEffects* effects) { |
| SkAutoDescriptor descStorage; |
| auto desc = create_descriptor(paint, font, matrix, props, flags, &descStorage, effects); |
| |
| return this->getOrCreateCache(*desc, *font.getTypefaceOrDefault(), *effects); |
| } |
| |
| SkScopedStrikeForGPU SkStrikeServer::findOrCreateScopedStrike(const SkDescriptor& desc, |
| const SkScalerContextEffects& effects, |
| const SkTypeface& typeface) { |
| return SkScopedStrikeForGPU{this->getOrCreateCache(desc, typeface, effects)}; |
| } |
| |
| void SkStrikeServer::AddGlyphForTesting( |
| RemoteStrike* cache, SkPackedGlyphID glyphID, bool asPath) { |
| cache->addGlyph(glyphID, asPath); |
| } |
| |
| void SkStrikeServer::checkForDeletedEntries() { |
| auto it = fDescToRemoteStrike.begin(); |
| while (fDescToRemoteStrike.size() > fMaxEntriesInDescriptorMap && |
| it != fDescToRemoteStrike.end()) { |
| RemoteStrike* strike = it->second.get(); |
| if (fDiscardableHandleManager->isHandleDeleted(strike->discardableHandleId())) { |
| // If we are removing the strike, we better not be trying to send it at the same time. |
| SkASSERT(!fRemoteStrikesToSend.contains(strike)); |
| it = fDescToRemoteStrike.erase(it); |
| } else { |
| ++it; |
| } |
| } |
| } |
| |
| SkStrikeServer::RemoteStrike* SkStrikeServer::getOrCreateCache( |
| const SkDescriptor& desc, const SkTypeface& typeface, SkScalerContextEffects effects) { |
| |
| // In cases where tracing is turned off, make sure not to get an unused function warning. |
| // Lambdaize the function. |
| TRACE_EVENT1("skia", "RecForDesc", "rec", |
| TRACE_STR_COPY( |
| [&desc](){ |
| auto ptr = desc.findEntry(kRec_SkDescriptorTag, nullptr); |
| SkScalerContextRec rec; |
| std::memcpy(&rec, ptr, sizeof(rec)); |
| return rec.dump(); |
| }().c_str() |
| ) |
| ); |
| |
| auto it = fDescToRemoteStrike.find(&desc); |
| if (it != fDescToRemoteStrike.end()) { |
| // We have processed the RemoteStrike before. Reuse it. |
| RemoteStrike* strike = it->second.get(); |
| strike->setTypefaceAndEffects(&typeface, effects); |
| if (fRemoteStrikesToSend.contains(strike)) { |
| // Already tracking |
| return strike; |
| } |
| |
| // Strike is in unknown state on GPU. Start tracking strike on GPU by locking it. |
| bool locked = fDiscardableHandleManager->lockHandle(it->second->discardableHandleId()); |
| if (locked) { |
| fRemoteStrikesToSend.add(strike); |
| return strike; |
| } |
| |
| fDescToRemoteStrike.erase(it); |
| } |
| |
| // Create a new RemoteStrike. Start by processing the typeface. |
| const SkFontID typefaceId = typeface.uniqueID(); |
| if (!fCachedTypefaces.contains(typefaceId)) { |
| fCachedTypefaces.add(typefaceId); |
| fTypefacesToSend.emplace_back(typefaceId, typeface.countGlyphs(), |
| typeface.fontStyle(), |
| typeface.isFixedPitch()); |
| } |
| |
| auto context = typeface.createScalerContext(effects, &desc); |
| auto newHandle = fDiscardableHandleManager->createHandle(); // Locked on creation |
| auto remoteStrike = skstd::make_unique<RemoteStrike>(desc, std::move(context), newHandle); |
| remoteStrike->setTypefaceAndEffects(&typeface, effects); |
| auto remoteStrikePtr = remoteStrike.get(); |
| fRemoteStrikesToSend.add(remoteStrikePtr); |
| auto d = &remoteStrike->getDescriptor(); |
| fDescToRemoteStrike[d] = std::move(remoteStrike); |
| |
| checkForDeletedEntries(); |
| |
| // Be sure we can build glyphs with this RemoteStrike. |
| remoteStrikePtr->setTypefaceAndEffects(&typeface, effects); |
| return remoteStrikePtr; |
| } |
| |
| // No need to write fForceBW because it is a flag private to SkScalerContext_DW, which will never |
| // be called on the GPU side. |
| static void writeGlyph(SkGlyph* glyph, Serializer* serializer) { |
| serializer->write<SkPackedGlyphID>(glyph->getPackedID()); |
| serializer->write<float>(glyph->advanceX()); |
| serializer->write<float>(glyph->advanceY()); |
| serializer->write<uint16_t>(glyph->width()); |
| serializer->write<uint16_t>(glyph->height()); |
| serializer->write<int16_t>(glyph->top()); |
| serializer->write<int16_t>(glyph->left()); |
| serializer->write<uint8_t>(glyph->maskFormat()); |
| } |
| |
| void SkStrikeServer::RemoteStrike::writePendingGlyphs(Serializer* serializer) { |
| SkASSERT(this->hasPendingGlyphs()); |
| |
| // Write the desc. |
| serializer->emplace<StrikeSpec>(fContext->getTypeface()->uniqueID(), fDiscardableHandleId); |
| serializer->writeDescriptor(*fDescriptor.getDesc()); |
| |
| serializer->emplace<bool>(fHaveSentFontMetrics); |
| if (!fHaveSentFontMetrics) { |
| // Write FontMetrics if not sent before. |
| SkFontMetrics fontMetrics; |
| fContext->getFontMetrics(&fontMetrics); |
| serializer->write<SkFontMetrics>(fontMetrics); |
| fHaveSentFontMetrics = true; |
| } |
| |
| // Write glyphs images. |
| serializer->emplace<uint64_t>(fPendingGlyphImages.size()); |
| for (const auto& glyphID : fPendingGlyphImages) { |
| SkGlyph glyph{glyphID}; |
| fContext->getMetrics(&glyph); |
| SkASSERT(SkMask::IsValidFormat(glyph.fMaskFormat)); |
| |
| writeGlyph(&glyph, serializer); |
| auto imageSize = glyph.imageSize(); |
| if (imageSize == 0u) continue; |
| |
| glyph.fImage = serializer->allocate(imageSize, glyph.formatAlignment()); |
| fContext->getImage(glyph); |
| // TODO: Generating the image can change the mask format, do we need to update it in the |
| // serialized glyph? |
| } |
| fPendingGlyphImages.clear(); |
| |
| // Write glyphs paths. |
| serializer->emplace<uint64_t>(fPendingGlyphPaths.size()); |
| for (const auto& glyphID : fPendingGlyphPaths) { |
| SkGlyph glyph{glyphID}; |
| fContext->getMetrics(&glyph); |
| SkASSERT(SkMask::IsValidFormat(glyph.fMaskFormat)); |
| |
| writeGlyph(&glyph, serializer); |
| writeGlyphPath(glyphID, serializer); |
| } |
| fPendingGlyphPaths.clear(); |
| } |
| |
| void SkStrikeServer::RemoteStrike::ensureScalerContext() { |
| if (fContext == nullptr) { |
| fContext = fTypeface->createScalerContext(fEffects, fDescriptor.getDesc()); |
| } |
| } |
| |
| void SkStrikeServer::RemoteStrike::resetScalerContext() { |
| fContext.reset(); |
| fTypeface = nullptr; |
| } |
| |
| void SkStrikeServer::RemoteStrike::setTypefaceAndEffects( |
| const SkTypeface* typeface, SkScalerContextEffects effects) { |
| fTypeface = typeface; |
| fEffects = effects; |
| } |
| |
| void SkStrikeServer::RemoteStrike::writeGlyphPath(const SkPackedGlyphID& glyphID, |
| Serializer* serializer) const { |
| SkPath path; |
| if (!fContext->getPath(glyphID, &path)) { |
| serializer->write<uint64_t>(0u); |
| return; |
| } |
| |
| size_t pathSize = path.writeToMemory(nullptr); |
| serializer->write<uint64_t>(pathSize); |
| path.writeToMemory(serializer->allocate(pathSize, kPathAlignment)); |
| } |
| |
| |
| // Be sure to read and understand the comment for prepareForDrawingRemoveEmpty in |
| // SkStrikeForGPU.h before working on this code. |
| SkSpan<const SkGlyphPos> |
| SkStrikeServer::RemoteStrike::prepareForDrawingRemoveEmpty( |
| const SkPackedGlyphID packedGlyphIDs[], |
| const SkPoint positions[], size_t n, |
| int maxDimension, |
| SkGlyphPos results[]) { |
| size_t drawableGlyphCount = 0; |
| for (size_t i = 0; i < n; i++) { |
| SkPoint glyphPos = positions[i]; |
| |
| // Check the cache for the glyph. |
| SkGlyph* glyphPtr = fGlyphMap.findOrNull(packedGlyphIDs[i]); |
| |
| // Has this glyph ever been seen before? |
| if (glyphPtr == nullptr) { |
| |
| // Never seen before. Make a new glyph. |
| glyphPtr = fAlloc.make<SkGlyph>(packedGlyphIDs[i]); |
| fGlyphMap.set(glyphPtr); |
| this->ensureScalerContext(); |
| fContext->getMetrics(glyphPtr); |
| |
| if (glyphPtr->maxDimension() <= maxDimension) { |
| // do nothing |
| } else if (!glyphPtr->isColor()) { |
| // The glyph is too big for the atlas, but it is not color, so it is handled |
| // with a path. |
| if (glyphPtr->setPath(&fAlloc, fContext.get())) { |
| // Always send the path data, even if its not available, to make sure empty |
| // paths are not incorrectly assumed to be cache misses. |
| fCachedGlyphPaths.add(glyphPtr->getPackedID()); |
| fPendingGlyphPaths.push_back(glyphPtr->getPackedID()); |
| } |
| } else { |
| // This will be handled by the fallback strike. |
| SkASSERT(glyphPtr->maxDimension() > maxDimension && glyphPtr->isColor()); |
| } |
| |
| // Make sure to send the glyph to the GPU because we always send the image for a glyph. |
| fCachedGlyphImages.add(packedGlyphIDs[i]); |
| fPendingGlyphImages.push_back(packedGlyphIDs[i]); |
| } |
| |
| // Each non-empty glyph needs to be added as per the contract for |
| // prepareForDrawingRemoveEmpty. |
| // TODO(herb): Change the code to only send the glyphs for fallback? |
| if (!glyphPtr->isEmpty()) { |
| results[drawableGlyphCount++] = {i, glyphPtr, glyphPos}; |
| } |
| } |
| return SkMakeSpan(results, drawableGlyphCount); |
| } |
| |
| // SkStrikeClient ---------------------------------------------------------------------------------- |
| class SkStrikeClient::DiscardableStrikePinner : public SkStrikePinner { |
| public: |
| DiscardableStrikePinner(SkDiscardableHandleId discardableHandleId, |
| sk_sp<DiscardableHandleManager> manager) |
| : fDiscardableHandleId(discardableHandleId), fManager(std::move(manager)) {} |
| |
| ~DiscardableStrikePinner() override = default; |
| bool canDelete() override { return fManager->deleteHandle(fDiscardableHandleId); } |
| |
| private: |
| const SkDiscardableHandleId fDiscardableHandleId; |
| sk_sp<DiscardableHandleManager> fManager; |
| }; |
| |
| SkStrikeClient::SkStrikeClient(sk_sp<DiscardableHandleManager> discardableManager, |
| bool isLogging, |
| SkStrikeCache* strikeCache) |
| : fDiscardableHandleManager(std::move(discardableManager)) |
| , fStrikeCache{strikeCache ? strikeCache : SkStrikeCache::GlobalStrikeCache()} |
| , fIsLogging{isLogging} {} |
| |
| SkStrikeClient::~SkStrikeClient() = default; |
| |
| #define READ_FAILURE \ |
| { \ |
| SkDebugf("Bad font data serialization line: %d", __LINE__); \ |
| DiscardableHandleManager::ReadFailureData data = { \ |
| memorySize, deserializer.bytesRead(), typefaceSize, \ |
| strikeCount, glyphImagesCount, glyphPathsCount}; \ |
| fDiscardableHandleManager->notifyReadFailure(data); \ |
| return false; \ |
| } |
| |
| // No need to read fForceBW because it is a flag private to SkScalerContext_DW, which will never |
| // be called on the GPU side. |
| bool SkStrikeClient::ReadGlyph(SkTLazy<SkGlyph>& glyph, Deserializer* deserializer) { |
| SkPackedGlyphID glyphID; |
| if (!deserializer->read<SkPackedGlyphID>(&glyphID)) return false; |
| glyph.init(glyphID); |
| if (!deserializer->read<float>(&glyph->fAdvanceX)) return false; |
| if (!deserializer->read<float>(&glyph->fAdvanceY)) return false; |
| if (!deserializer->read<uint16_t>(&glyph->fWidth)) return false; |
| if (!deserializer->read<uint16_t>(&glyph->fHeight)) return false; |
| if (!deserializer->read<int16_t>(&glyph->fTop)) return false; |
| if (!deserializer->read<int16_t>(&glyph->fLeft)) return false; |
| if (!deserializer->read<uint8_t>(&glyph->fMaskFormat)) return false; |
| if (!SkMask::IsValidFormat(glyph->fMaskFormat)) return false; |
| |
| return true; |
| } |
| |
| bool SkStrikeClient::readStrikeData(const volatile void* memory, size_t memorySize) { |
| SkASSERT(memorySize != 0u); |
| Deserializer deserializer(static_cast<const volatile char*>(memory), memorySize); |
| |
| uint64_t typefaceSize = 0u; |
| uint64_t strikeCount = 0u; |
| uint64_t glyphImagesCount = 0u; |
| uint64_t glyphPathsCount = 0u; |
| |
| if (!deserializer.read<uint64_t>(&typefaceSize)) READ_FAILURE |
| |
| for (size_t i = 0; i < typefaceSize; ++i) { |
| WireTypeface wire; |
| if (!deserializer.read<WireTypeface>(&wire)) READ_FAILURE |
| |
| // TODO(khushalsagar): The typeface no longer needs a reference to the |
| // SkStrikeClient, since all needed glyphs must have been pushed before |
| // raster. |
| addTypeface(wire); |
| } |
| |
| if (!deserializer.read<uint64_t>(&strikeCount)) READ_FAILURE |
| |
| for (size_t i = 0; i < strikeCount; ++i) { |
| StrikeSpec spec; |
| if (!deserializer.read<StrikeSpec>(&spec)) READ_FAILURE |
| |
| SkAutoDescriptor sourceAd; |
| if (!deserializer.readDescriptor(&sourceAd)) READ_FAILURE |
| |
| bool fontMetricsInitialized; |
| if (!deserializer.read(&fontMetricsInitialized)) READ_FAILURE |
| |
| SkFontMetrics fontMetrics{}; |
| if (!fontMetricsInitialized) { |
| if (!deserializer.read<SkFontMetrics>(&fontMetrics)) READ_FAILURE |
| } |
| |
| // Get the local typeface from remote fontID. |
| auto* tfPtr = fRemoteFontIdToTypeface.find(spec.typefaceID); |
| // Received strikes for a typeface which doesn't exist. |
| if (!tfPtr) READ_FAILURE |
| auto* tf = tfPtr->get(); |
| |
| // Replace the ContextRec in the desc from the server to create the client |
| // side descriptor. |
| // TODO: Can we do this in-place and re-compute checksum? Instead of a complete copy. |
| SkAutoDescriptor ad; |
| auto* client_desc = auto_descriptor_from_desc(sourceAd.getDesc(), tf->uniqueID(), &ad); |
| |
| auto strike = fStrikeCache->findStrikeExclusive(*client_desc); |
| // Metrics are only sent the first time. If the metrics are not initialized, there must |
| // be an existing strike. |
| if (fontMetricsInitialized && strike == nullptr) READ_FAILURE |
| if (strike == nullptr) { |
| // Note that we don't need to deserialize the effects since we won't be generating any |
| // glyphs here anyway, and the desc is still correct since it includes the serialized |
| // effects. |
| SkScalerContextEffects effects; |
| auto scaler = SkStrikeCache::CreateScalerContext(*client_desc, effects, *tf); |
| strike = fStrikeCache->createStrikeExclusive( |
| *client_desc, std::move(scaler), &fontMetrics, |
| skstd::make_unique<DiscardableStrikePinner>(spec.discardableHandleId, |
| fDiscardableHandleManager)); |
| auto proxyContext = static_cast<SkScalerContextProxy*>(strike->getScalerContext()); |
| proxyContext->initCache(strike.get(), fStrikeCache); |
| } |
| |
| if (!deserializer.read<uint64_t>(&glyphImagesCount)) READ_FAILURE |
| for (size_t j = 0; j < glyphImagesCount; j++) { |
| SkTLazy<SkGlyph> glyph; |
| if (!ReadGlyph(glyph, &deserializer)) READ_FAILURE |
| |
| if (!glyph->isEmpty()) { |
| const volatile void* image = |
| deserializer.read(glyph->imageSize(), glyph->formatAlignment()); |
| if (!image) READ_FAILURE |
| glyph->fImage = (void*)image; |
| } |
| |
| strike->mergeGlyphAndImage(glyph->getPackedID(), *glyph); |
| } |
| |
| if (!deserializer.read<uint64_t>(&glyphPathsCount)) READ_FAILURE |
| for (size_t j = 0; j < glyphPathsCount; j++) { |
| SkTLazy<SkGlyph> glyph; |
| if (!ReadGlyph(glyph, &deserializer)) READ_FAILURE |
| |
| SkGlyph* allocatedGlyph = strike->mergeGlyphAndImage(glyph->getPackedID(), *glyph); |
| |
| SkPath* pathPtr = nullptr; |
| SkPath path; |
| uint64_t pathSize = 0u; |
| if (!deserializer.read<uint64_t>(&pathSize)) READ_FAILURE |
| |
| if (pathSize > 0) { |
| auto* pathData = deserializer.read(pathSize, kPathAlignment); |
| if (!pathData) READ_FAILURE |
| if (!path.readFromMemory(const_cast<const void*>(pathData), pathSize)) READ_FAILURE |
| pathPtr = &path; |
| } |
| |
| strike->preparePath(allocatedGlyph, pathPtr); |
| } |
| } |
| |
| return true; |
| } |
| |
| sk_sp<SkTypeface> SkStrikeClient::deserializeTypeface(const void* buf, size_t len) { |
| WireTypeface wire; |
| if (len != sizeof(wire)) return nullptr; |
| memcpy(&wire, buf, sizeof(wire)); |
| return this->addTypeface(wire); |
| } |
| |
| sk_sp<SkTypeface> SkStrikeClient::addTypeface(const WireTypeface& wire) { |
| auto* typeface = fRemoteFontIdToTypeface.find(wire.typefaceID); |
| if (typeface) return *typeface; |
| |
| auto newTypeface = sk_make_sp<SkTypefaceProxy>( |
| wire.typefaceID, wire.glyphCount, wire.style, wire.isFixed, |
| fDiscardableHandleManager, fIsLogging); |
| fRemoteFontIdToTypeface.set(wire.typefaceID, newTypeface); |
| return newTypeface; |
| } |
