| /* |
| * 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 "SkRemoteGlyphCache.h" |
| |
| #include <iterator> |
| #include <memory> |
| #include <new> |
| #include <string> |
| #include <tuple> |
| |
| #include "SkDevice.h" |
| #include "SkDraw.h" |
| #include "SkGlyphRun.h" |
| #include "SkGlyphCache.h" |
| #include "SkRemoteGlyphCacheImpl.h" |
| #include "SkStrikeCache.h" |
| #include "SkTraceEvent.h" |
| #include "SkTypeface_remote.h" |
| |
| #if SK_SUPPORT_GPU |
| #include "GrDrawOpAtlas.h" |
| #include "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; |
| } |
| |
| enum DescriptorType : bool { kKey = false, kDevice = true }; |
| static const SkDescriptor* create_descriptor( |
| DescriptorType type, const SkPaint& paint, const SkFont& font, const SkMatrix& m, |
| const SkSurfaceProps& props, SkScalerContextFlags flags, |
| SkAutoDescriptor* ad, SkScalerContextEffects* effects) { |
| SkScalerContextRec deviceRec; |
| bool enableTypefaceFiltering = (type == kDevice); |
| SkScalerContext::MakeRecAndEffects( |
| font, paint, props, flags, m, &deviceRec, effects, enableTypefaceFiltering); |
| return SkScalerContext::AutoDescriptorGivenRecAndEffects(deviceRec, *effects, ad); |
| } |
| |
| // -- Serializer ---------------------------------------------------------------------------------- |
| |
| size_t pad(size_t size, size_t alignment) { return (size + (alignment - 1)) & ~(alignment - 1); } |
| |
| 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), alignof(T)); |
| return new (result) T{std::forward<Args>(args)...}; |
| } |
| |
| template <typename T> |
| void write(const T& data) { |
| T* result = (T*)allocate(sizeof(T), alignof(T)); |
| memcpy(result, &data, sizeof(T)); |
| } |
| |
| template <typename T> |
| T* allocate() { |
| T* result = (T*)allocate(sizeof(T), alignof(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), alignof(T)); |
| if (!result) return false; |
| |
| memcpy(val, const_cast<const char*>(result), sizeof(T)); |
| return true; |
| } |
| |
| bool readDescriptor(SkAutoDescriptor* ad) { |
| uint32_t desc_length = 0u; |
| if (!read<uint32_t>(&desc_length)) return false; |
| |
| auto* result = this->ensureAtLeast(desc_length, alignof(SkDescriptor)); |
| if (!result) return false; |
| |
| ad->reset(desc_length); |
| memcpy(ad->getDesc(), const_cast<const char*>(result), desc_length); |
| return true; |
| } |
| |
| const volatile void* read(size_t size, size_t alignment) { |
| return this->ensureAtLeast(size, alignment); |
| } |
| |
| private: |
| const volatile char* ensureAtLeast(size_t size, size_t alignment) { |
| size_t padded = pad(fBytesRead, alignment); |
| |
| // Not enough data |
| if (padded + size > fMemorySize) 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; |
| |
| bool read_path(Deserializer* deserializer, SkGlyph* glyph, SkGlyphCache* cache) { |
| uint64_t pathSize = 0u; |
| if (!deserializer->read<uint64_t>(&pathSize)) return false; |
| |
| if (pathSize == 0u) return true; |
| |
| auto* path = deserializer->read(pathSize, kPathAlignment); |
| if (!path) return false; |
| |
| return cache->initializePath(glyph, path, pathSize); |
| } |
| |
| size_t SkDescriptorMapOperators::operator()(const SkDescriptor* key) const { |
| return key->getChecksum(); |
| } |
| |
| bool SkDescriptorMapOperators::operator()(const SkDescriptor* lhs, const SkDescriptor* rhs) const { |
| return *lhs == *rhs; |
| } |
| |
| struct StrikeSpec { |
| StrikeSpec() {} |
| StrikeSpec(SkFontID typefaceID_, SkDiscardableHandleId discardableHandleId_) |
| : typefaceID{typefaceID_}, discardableHandleId(discardableHandleId_) {} |
| SkFontID typefaceID = 0u; |
| SkDiscardableHandleId discardableHandleId = 0u; |
| /* desc */ |
| /* n X (glyphs ids) */ |
| }; |
| |
| // -- TrackLayerDevice ----------------------------------------------------------------------------- |
| SkTextBlobCacheDiffCanvas::TrackLayerDevice::TrackLayerDevice( |
| const SkIRect& bounds, const SkSurfaceProps& props, SkStrikeServer* server, |
| const SkTextBlobCacheDiffCanvas::Settings& settings) |
| : SkNoPixelsDevice(bounds, props) |
| , fStrikeServer(server) |
| , fSettings(settings) |
| , fPainter{props, kUnknown_SkColorType, SkScalerContextFlags::kFakeGammaAndBoostContrast} { |
| SkASSERT(fStrikeServer); |
| } |
| |
| SkBaseDevice* SkTextBlobCacheDiffCanvas::TrackLayerDevice::onCreateDevice( |
| const CreateInfo& cinfo, const SkPaint*) { |
| const SkSurfaceProps surfaceProps(this->surfaceProps().flags(), cinfo.fPixelGeometry); |
| return new TrackLayerDevice(this->getGlobalBounds(), surfaceProps, fStrikeServer, fSettings); |
| } |
| |
| void SkTextBlobCacheDiffCanvas::TrackLayerDevice::drawGlyphRunList( |
| const SkGlyphRunList& glyphRunList) { |
| for (auto& glyphRun : glyphRunList) { |
| this->processGlyphRun(glyphRunList.origin(), glyphRun, glyphRunList.paint()); |
| } |
| } |
| |
| // -- SkTextBlobCacheDiffCanvas ------------------------------------------------------------------- |
| SkTextBlobCacheDiffCanvas::Settings::Settings() = default; |
| |
| SkTextBlobCacheDiffCanvas::SkTextBlobCacheDiffCanvas(int width, int height, |
| const SkMatrix& deviceMatrix, |
| const SkSurfaceProps& props, |
| SkStrikeServer* strikeServer, |
| Settings settings) |
| : SkNoDrawCanvas{sk_make_sp<TrackLayerDevice>(SkIRect::MakeWH(width, height), props, |
| strikeServer, settings)} {} |
| |
| SkTextBlobCacheDiffCanvas::SkTextBlobCacheDiffCanvas( |
| int width, int height, const SkSurfaceProps& props, |
| SkStrikeServer* strikeServer, Settings settings) |
| : SkNoDrawCanvas{sk_make_sp<TrackLayerDevice>( |
| SkIRect::MakeWH(width, height), props, strikeServer, settings)} {} |
| |
| 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); |
| } |
| |
| 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; |
| int glyphCount; |
| SkFontStyle style; |
| bool isFixed; |
| }; |
| |
| // 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) { |
| if (fLockedDescs.empty() && fTypefacesToSend.empty()) { |
| 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>(fLockedDescs.size()); |
| for (const auto* desc : fLockedDescs) { |
| auto it = fRemoteGlyphStateMap.find(desc); |
| SkASSERT(it != fRemoteGlyphStateMap.end()); |
| it->second->writePendingGlyphs(&serializer); |
| } |
| fLockedDescs.clear(); |
| } |
| |
| SkStrikeServer::SkGlyphCacheState* SkStrikeServer::getOrCreateCache( |
| const SkPaint& paint, |
| const SkFont& font, |
| const SkSurfaceProps& props, |
| const SkMatrix& matrix, |
| SkScalerContextFlags flags, |
| SkScalerContextEffects* effects) { |
| SkAutoDescriptor keyAutoDesc; |
| auto keyDesc = create_descriptor( |
| kKey, paint, font, matrix, props, flags, &keyAutoDesc, 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( |
| [keyDesc](){ |
| auto ptr = keyDesc->findEntry(kRec_SkDescriptorTag, nullptr); |
| SkScalerContextRec rec; |
| std::memcpy(&rec, ptr, sizeof(rec)); |
| return rec.dump(); |
| }().c_str() |
| ) |
| ); |
| |
| // Already locked. |
| if (fLockedDescs.find(keyDesc) != fLockedDescs.end()) { |
| auto it = fRemoteGlyphStateMap.find(keyDesc); |
| SkASSERT(it != fRemoteGlyphStateMap.end()); |
| SkGlyphCacheState* cache = it->second.get(); |
| cache->setFontAndEffects(font, SkScalerContextEffects{paint}); |
| return cache; |
| } |
| |
| // Try to lock. |
| auto it = fRemoteGlyphStateMap.find(keyDesc); |
| if (it != fRemoteGlyphStateMap.end()) { |
| SkGlyphCacheState* cache = it->second.get(); |
| #ifdef SK_DEBUG |
| SkScalerContextEffects deviceEffects; |
| SkAutoDescriptor deviceAutoDesc; |
| auto deviceDesc = create_descriptor( |
| kDevice, paint, font, matrix, props, flags, &deviceAutoDesc, &deviceEffects); |
| SkASSERT(cache->getDeviceDescriptor() == *deviceDesc); |
| #endif |
| bool locked = fDiscardableHandleManager->lockHandle(it->second->discardableHandleId()); |
| if (locked) { |
| fLockedDescs.insert(it->first); |
| cache->setFontAndEffects(font, SkScalerContextEffects{paint}); |
| return cache; |
| } |
| |
| // If the lock failed, the entry was deleted on the client. Remove our |
| // tracking. |
| fRemoteGlyphStateMap.erase(it); |
| } |
| |
| auto* tf = font.getTypeface(); |
| const SkFontID typefaceId = tf->uniqueID(); |
| if (!fCachedTypefaces.contains(typefaceId)) { |
| fCachedTypefaces.add(typefaceId); |
| fTypefacesToSend.emplace_back(typefaceId, tf->countGlyphs(), tf->fontStyle(), |
| tf->isFixedPitch()); |
| } |
| |
| SkScalerContextEffects deviceEffects; |
| SkAutoDescriptor deviceAutoDesc; |
| auto deviceDesc = create_descriptor( |
| kDevice, paint, font, matrix, props, flags, &deviceAutoDesc, &deviceEffects); |
| |
| auto context = tf->createScalerContext(deviceEffects, deviceDesc); |
| |
| // Create a new cache state and insert it into the map. |
| auto newHandle = fDiscardableHandleManager->createHandle(); |
| auto cacheState = skstd::make_unique<SkGlyphCacheState>( |
| *keyDesc, *deviceDesc, std::move(context), newHandle); |
| |
| auto* cacheStatePtr = cacheState.get(); |
| |
| fLockedDescs.insert(&cacheStatePtr->getKeyDescriptor()); |
| fRemoteGlyphStateMap[&cacheStatePtr->getKeyDescriptor()] = std::move(cacheState); |
| |
| checkForDeletedEntries(); |
| |
| cacheStatePtr->setFontAndEffects(font, SkScalerContextEffects{paint}); |
| return cacheStatePtr; |
| } |
| |
| void SkStrikeServer::checkForDeletedEntries() { |
| auto it = fRemoteGlyphStateMap.begin(); |
| while (fRemoteGlyphStateMap.size() > fMaxEntriesInDescriptorMap && |
| it != fRemoteGlyphStateMap.end()) { |
| if (fDiscardableHandleManager->isHandleDeleted(it->second->discardableHandleId())) { |
| it = fRemoteGlyphStateMap.erase(it); |
| } else { |
| ++it; |
| } |
| } |
| } |
| |
| // -- SkGlyphCacheState ---------------------------------------------------------------------------- |
| SkStrikeServer::SkGlyphCacheState::SkGlyphCacheState( |
| const SkDescriptor& keyDescriptor, |
| const SkDescriptor& deviceDescriptor, |
| std::unique_ptr<SkScalerContext> context, |
| uint32_t discardableHandleId) |
| : fKeyDescriptor{keyDescriptor} |
| , fDeviceDescriptor{deviceDescriptor} |
| , fDiscardableHandleId(discardableHandleId) |
| , fIsSubpixel{context->isSubpixel()} |
| , fAxisAlignmentForHText{context->computeAxisAlignmentForHText()} |
| // N.B. context must come last because it is used above. |
| , fContext{std::move(context)} { |
| SkASSERT(fKeyDescriptor.getDesc() != nullptr); |
| SkASSERT(fDeviceDescriptor.getDesc() != nullptr); |
| SkASSERT(fContext != nullptr); |
| } |
| |
| SkStrikeServer::SkGlyphCacheState::~SkGlyphCacheState() = default; |
| |
| void SkStrikeServer::SkGlyphCacheState::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); |
| } |
| |
| static void writeGlyph(SkGlyph* glyph, Serializer* serializer) { |
| serializer->write<SkPackedGlyphID>(glyph->getPackedID()); |
| serializer->write<float>(glyph->fAdvanceX); |
| serializer->write<float>(glyph->fAdvanceY); |
| serializer->write<uint16_t>(glyph->fWidth); |
| serializer->write<uint16_t>(glyph->fHeight); |
| serializer->write<int16_t>(glyph->fTop); |
| serializer->write<int16_t>(glyph->fLeft); |
| serializer->write<int8_t>(glyph->fForceBW); |
| serializer->write<uint8_t>(glyph->fMaskFormat); |
| } |
| |
| void SkStrikeServer::SkGlyphCacheState::writePendingGlyphs(Serializer* serializer) { |
| // TODO(khushalsagar): Write a strike only if it has any pending glyphs. |
| serializer->emplace<bool>(this->hasPendingGlyphs()); |
| if (!this->hasPendingGlyphs()) { |
| this->resetScalerContext(); |
| return; |
| } |
| |
| // Write the desc. |
| serializer->emplace<StrikeSpec>(fContext->getTypeface()->uniqueID(), fDiscardableHandleId); |
| serializer->writeDescriptor(*fKeyDescriptor.getDesc()); |
| |
| // Write FontMetrics. |
| // TODO(khushalsagar): Do we need to re-send each time? |
| SkFontMetrics fontMetrics; |
| fContext->getFontMetrics(&fontMetrics); |
| serializer->write<SkFontMetrics>(fontMetrics); |
| |
| // Write glyphs images. |
| serializer->emplace<uint64_t>(fPendingGlyphImages.size()); |
| for (const auto& glyphID : fPendingGlyphImages) { |
| SkGlyph glyph; |
| glyph.initWithGlyphID(glyphID); |
| fContext->getMetrics(&glyph); |
| writeGlyph(&glyph, serializer); |
| |
| auto imageSize = glyph.computeImageSize(); |
| 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; |
| glyph.initWithGlyphID(glyphID); |
| fContext->getMetrics(&glyph); |
| writeGlyph(&glyph, serializer); |
| writeGlyphPath(glyphID, serializer); |
| } |
| fPendingGlyphPaths.clear(); |
| this->resetScalerContext(); |
| } |
| |
| const SkGlyph& SkStrikeServer::SkGlyphCacheState::findGlyph(SkPackedGlyphID glyphID) { |
| auto* glyph = fGlyphMap.find(glyphID); |
| if (glyph == nullptr) { |
| this->ensureScalerContext(); |
| glyph = fGlyphMap.set(glyphID, SkGlyph()); |
| glyph->initWithGlyphID(glyphID); |
| fContext->getMetrics(glyph); |
| } |
| |
| return *glyph; |
| } |
| |
| void SkStrikeServer::SkGlyphCacheState::ensureScalerContext() { |
| if (fContext == nullptr) { |
| auto tf = fFont->getTypeface(); |
| fContext = tf->createScalerContext(fEffects, fDeviceDescriptor.getDesc()); |
| } |
| } |
| |
| void SkStrikeServer::SkGlyphCacheState::resetScalerContext() { |
| fContext.reset(); |
| fFont = nullptr; |
| } |
| |
| void SkStrikeServer::SkGlyphCacheState::setFontAndEffects( |
| const SkFont& font, SkScalerContextEffects effects) { |
| fFont = &font; |
| fEffects = effects; |
| } |
| |
| SkVector SkStrikeServer::SkGlyphCacheState::rounding() const { |
| return SkGlyphCacheCommon::PixelRounding(fIsSubpixel, fAxisAlignmentForHText); |
| } |
| |
| const SkGlyph& SkStrikeServer::SkGlyphCacheState::getGlyphMetrics( |
| SkGlyphID glyphID, SkPoint position) { |
| SkIPoint lookupPoint = SkGlyphCacheCommon::SubpixelLookup(fAxisAlignmentForHText, position); |
| SkPackedGlyphID packedGlyphID = fIsSubpixel ? SkPackedGlyphID{glyphID, lookupPoint} |
| : SkPackedGlyphID{glyphID}; |
| |
| return this->findGlyph(packedGlyphID); |
| } |
| |
| bool SkStrikeServer::SkGlyphCacheState::hasImage(const SkGlyph& glyph) { |
| // If a glyph has width and height, it must have an image available to it. |
| return !glyph.isEmpty(); |
| } |
| |
| bool SkStrikeServer::SkGlyphCacheState::hasPath(const SkGlyph& glyph) { |
| return const_cast<SkGlyph&>(glyph).addPath(fContext.get(), &fAlloc) != nullptr; |
| } |
| |
| void SkStrikeServer::SkGlyphCacheState::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)); |
| } |
| |
| // 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 \ |
| { \ |
| SkDEBUGFAIL("Bad serialization"); \ |
| return false; \ |
| } |
| |
| static bool readGlyph(SkGlyph* glyph, Deserializer* deserializer) { |
| SkPackedGlyphID glyphID; |
| if (!deserializer->read<SkPackedGlyphID>(&glyphID)) return false; |
| glyph->initWithGlyphID(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<int8_t>(&glyph->fForceBW)) return false; |
| if (!deserializer->read<uint8_t>(&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; |
| 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); |
| } |
| |
| uint64_t strikeCount = 0u; |
| if (!deserializer.read<uint64_t>(&strikeCount)) READ_FAILURE |
| |
| for (size_t i = 0; i < strikeCount; ++i) { |
| bool has_glyphs = false; |
| if (!deserializer.read<bool>(&has_glyphs)) READ_FAILURE |
| |
| if (!has_glyphs) continue; |
| |
| StrikeSpec spec; |
| if (!deserializer.read<StrikeSpec>(&spec)) READ_FAILURE |
| |
| SkAutoDescriptor sourceAd; |
| if (!deserializer.readDescriptor(&sourceAd)) READ_FAILURE |
| |
| SkFontMetrics fontMetrics; |
| if (!deserializer.read<SkFontMetrics>(&fontMetrics)) READ_FAILURE |
| |
| // Get the local typeface from remote fontID. |
| auto* tf = fRemoteFontIdToTypeface.find(spec.typefaceID)->get(); |
| // Received strikes for a typeface which doesn't exist. |
| if (!tf) READ_FAILURE |
| |
| // 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); |
| 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); |
| } |
| |
| uint64_t glyphImagesCount = 0u; |
| if (!deserializer.read<uint64_t>(&glyphImagesCount)) READ_FAILURE |
| for (size_t j = 0; j < glyphImagesCount; j++) { |
| SkGlyph glyph; |
| if (!readGlyph(&glyph, &deserializer)) READ_FAILURE |
| |
| SkGlyph* allocatedGlyph = strike->getRawGlyphByID(glyph.getPackedID()); |
| |
| // Update the glyph unless it's already got an image (from fallback), |
| // preserving any path that might be present. |
| if (allocatedGlyph->fImage == nullptr) { |
| auto* glyphPath = allocatedGlyph->fPathData; |
| *allocatedGlyph = glyph; |
| allocatedGlyph->fPathData = glyphPath; |
| } |
| |
| auto imageSize = glyph.computeImageSize(); |
| if (imageSize == 0u) continue; |
| |
| auto* image = deserializer.read(imageSize, allocatedGlyph->formatAlignment()); |
| if (!image) READ_FAILURE |
| strike->initializeImage(image, imageSize, allocatedGlyph); |
| } |
| |
| uint64_t glyphPathsCount = 0u; |
| if (!deserializer.read<uint64_t>(&glyphPathsCount)) READ_FAILURE |
| for (size_t j = 0; j < glyphPathsCount; j++) { |
| SkGlyph glyph; |
| if (!readGlyph(&glyph, &deserializer)) READ_FAILURE |
| |
| SkGlyph* allocatedGlyph = strike->getRawGlyphByID(glyph.getPackedID()); |
| |
| // Update the glyph unless it's already got a path (from fallback), |
| // preserving any image that might be present. |
| if (allocatedGlyph->fPathData == nullptr) { |
| auto* glyphImage = allocatedGlyph->fImage; |
| *allocatedGlyph = glyph; |
| allocatedGlyph->fImage = glyphImage; |
| } |
| |
| if (!read_path(&deserializer, allocatedGlyph, strike.get())) READ_FAILURE |
| } |
| } |
| |
| 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 std::move(newTypeface); |
| } |