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* Copyright 2018 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkRemoteGlyphCacheImpl_DEFINED
#define SkRemoteGlyphCacheImpl_DEFINED
#include "SkArenaAlloc.h"
#include "SkDescriptor.h"
#include "SkGlyphRun.h"
#include "SkGlyphRunPainter.h"
#include "SkRemoteGlyphCache.h"
class SkStrikeServer::SkGlyphCacheState : public SkStrikeInterface {
// N.B. SkGlyphCacheState is not valid until ensureScalerContext is called.
SkGlyphCacheState(const SkDescriptor& descriptor,
std::unique_ptr<SkScalerContext> context,
SkDiscardableHandleId discardableHandleId);
~SkGlyphCacheState() override;
void addGlyph(SkPackedGlyphID, bool pathOnly);
void writePendingGlyphs(Serializer* serializer);
SkDiscardableHandleId discardableHandleId() const { return fDiscardableHandleId; }
bool isSubpixel() const { return fIsSubpixel; }
SkAxisAlignment axisAlignmentForHText() const { return fAxisAlignmentForHText; }
const SkDescriptor& getDescriptor() const override {
return *fDescriptor.getDesc();
SkStrikeSpec strikeSpec() const override {
return SkStrikeSpec(this->getDescriptor(), *fTypeface, fEffects);
void setTypefaceAndEffects(const SkTypeface* typeface, SkScalerContextEffects effects);
SkVector rounding() const override;
const SkGlyph& getGlyphMetrics(SkGlyphID glyphID, SkPoint position) override;
SkSpan<const SkGlyphPos> prepareForDrawing(const SkGlyphID glyphIDs[],
const SkPoint positions[],
size_t n,
int maxDimension,
SkGlyphPos results[]) override;
bool decideCouldDrawFromPath(const SkGlyph& glyph) override;
void onAboutToExitScope() override {}
bool hasPendingGlyphs() const {
return !fPendingGlyphImages.empty() || !fPendingGlyphPaths.empty();
void writeGlyphPath(const SkPackedGlyphID& glyphID, Serializer* serializer) const;
void ensureScalerContext();
void resetScalerContext();
// 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;
// Values saved from the initial context.
const bool fIsSubpixel;
const SkAxisAlignment fAxisAlignmentForHText;
// The context built using fDescriptor
std::unique_ptr<SkScalerContext> fContext;
// These fields are set everytime getOrCreateCache. This allows the code to maintain the
// fContext as lazy as possible.
const SkTypeface* fTypeface{nullptr};
SkScalerContextEffects fEffects;
class GlyphMapHashTraits {
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};
class SkTextBlobCacheDiffCanvas::TrackLayerDevice : public SkNoPixelsDevice {
TrackLayerDevice(const SkIRect& bounds, const SkSurfaceProps& props, SkStrikeServer* server,
sk_sp<SkColorSpace> colorSpace,
const SkTextBlobCacheDiffCanvas::Settings& settings);
SkBaseDevice* onCreateDevice(const CreateInfo& cinfo, const SkPaint*) override;
void drawGlyphRunList(const SkGlyphRunList& glyphRunList) override;
SkStrikeServer* const fStrikeServer;
const SkTextBlobCacheDiffCanvas::Settings fSettings;
SkGlyphRunListPainter fPainter;
#endif // SkRemoteGlyphCacheImpl_DEFINED