/*
* 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 "SkRemoteGlyphCacheImpl.h"
#include "SkStrike.h"
#include "SkStrikeCache.h"
#include "SkTLazy.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, SkStrike* 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.getTypefaceOrDefault();
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{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{glyphID};
fContext->getMetrics(&glyph);
writeGlyph(&glyph, serializer);
writeGlyphPath(glyphID, serializer);
}
fPendingGlyphPaths.clear();
this->resetScalerContext();
}
const SkGlyph& SkStrikeServer::SkGlyphCacheState::findGlyph(SkPackedGlyphID glyphID) {
SkGlyph* glyphPtr = fGlyphMap.findOrNull(glyphID);
if (glyphPtr == nullptr) {
glyphPtr = fAlloc.make<SkGlyph>(glyphID);
fGlyphMap.set(glyphPtr);
this->ensureScalerContext();
fContext->getMetrics(glyphPtr);
}
return *glyphPtr;
}
void SkStrikeServer::SkGlyphCacheState::ensureScalerContext() {
if (fContext == nullptr) {
auto tf = fFont->getTypefaceOrDefault();
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 SkStrikeCommon::PixelRounding(fIsSubpixel, fAxisAlignmentForHText);
}
const SkGlyph& SkStrikeServer::SkGlyphCacheState::getGlyphMetrics(
SkGlyphID glyphID, SkPoint position) {
SkIPoint lookupPoint = SkStrikeCommon::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(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<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++) {
SkTLazy<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++) {
SkTLazy<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);
}