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* Copyright 2015 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef GrStrikeCache_DEFINED
#define GrStrikeCache_DEFINED
#include "include/private/SkTHash.h"
#include "src/core/SkArenaAlloc.h"
#include "src/core/SkDescriptor.h"
#include "src/gpu/GrGlyph.h"
class GrAtlasManager;
class GrGpu;
class GrStrikeCache;
class SkBulkGlyphMetricsAndImages;
* The GrTextStrike manages a pool of CPU backing memory for GrGlyphs. This backing memory
* is indexed by a PackedID and SkStrike. The SkStrike is what actually creates the mask.
* The GrTextStrike may outlive the generating SkStrike. However, it retains a copy
* of it's SkDescriptor as a key to access (or regenerate) the SkStrike. GrTextStrikes are
* created by and owned by a GrStrikeCache.
class GrTextStrike : public SkNVRefCnt<GrTextStrike> {
GrTextStrike(const SkDescriptor& fontScalerKey);
GrGlyph* getGlyph(SkPackedGlyphID);
struct HashTraits {
// GetKey and Hash for the the hash table.
static const SkPackedGlyphID& GetKey(const GrGlyph* glyph) {
return glyph->fPackedID;
static uint32_t Hash(SkPackedGlyphID key) {
return SkChecksum::Mix(key.hash());
SkTHashTable<GrGlyph*, SkPackedGlyphID, HashTraits> fCache;
SkAutoDescriptor fFontScalerKey;
SkArenaAlloc fAlloc{512};
friend class GrStrikeCache;
* GrStrikeCache manages strikes which are indexed by a SkStrike. These strikes can then be
* used to generate individual Glyph Masks.
class GrStrikeCache {
// The user of the cache may hold a long-lived ref to the returned strike. However, actions by
// another client of the cache may cause the strike to be purged while it is still reffed.
// Therefore, the caller must check GrTextStrike::isAbandoned() if there are other
// interactions with the cache since the strike was received.
sk_sp<GrTextStrike> findOrCreateStrike(const SkDescriptor& desc) {
if (sk_sp<GrTextStrike>* cached = fCache.find(desc)) {
return *cached;
return this->generateStrike(desc);
void freeAll();
sk_sp<GrTextStrike> generateStrike(const SkDescriptor& desc) {
sk_sp<GrTextStrike> strike = sk_make_sp<GrTextStrike>(desc);
return strike;
struct DescriptorHashTraits {
static const SkDescriptor& GetKey(const sk_sp<GrTextStrike>& strike) {
return *strike->fFontScalerKey.getDesc();
static uint32_t Hash(const SkDescriptor& desc) { return desc.getChecksum(); }
using StrikeHash = SkTHashTable<sk_sp<GrTextStrike>, SkDescriptor, DescriptorHashTraits>;
StrikeHash fCache;
#endif // GrStrikeCache_DEFINED