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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkStrikeCache_DEFINED
#define SkStrikeCache_DEFINED
#include "SkDescriptor.h"
#include "SkSpinlock.h"
#include "SkTemplates.h"
#include "SkArenaAlloc.h"
class SkGlyphCache;
class SkTraceMemoryDump;
#ifndef SK_DEFAULT_FONT_CACHE_COUNT_LIMIT
#define SK_DEFAULT_FONT_CACHE_COUNT_LIMIT 2048
#endif
#ifndef SK_DEFAULT_FONT_CACHE_LIMIT
#define SK_DEFAULT_FONT_CACHE_LIMIT (2 * 1024 * 1024)
#endif
#ifndef SK_DEFAULT_FONT_CACHE_POINT_SIZE_LIMIT
#define SK_DEFAULT_FONT_CACHE_POINT_SIZE_LIMIT 256
#endif
///////////////////////////////////////////////////////////////////////////////
class SkGlyphCache;
class SkStrikeCache {
public:
SkStrikeCache() = default;
~SkStrikeCache();
static void AttachCache(SkGlyphCache* cache);
using ExclusiveStrikePtr =
std::unique_ptr<
SkGlyphCache,
SkFunctionWrapper<void, SkGlyphCache, SkStrikeCache::AttachCache>>;
static ExclusiveStrikePtr FindStrikeExclusive(const SkDescriptor&);
static std::unique_ptr<SkScalerContext> CreateScalerContext(
const SkDescriptor&, const SkScalerContextEffects&, const SkTypeface&);
static ExclusiveStrikePtr CreateStrikeExclusive(
const SkDescriptor& desc,
std::unique_ptr<SkScalerContext> scaler,
SkPaint::FontMetrics* maybeMetrics = nullptr);
static void PurgeAll();
static void Dump();
// Dump memory usage statistics of all the attaches caches in the process using the
// SkTraceMemoryDump interface.
static void DumpMemoryStatistics(SkTraceMemoryDump* dump);
// call when a glyphcache is available for caching (i.e. not in use)
void attachCache(SkGlyphCache *cache);
ExclusiveStrikePtr findStrikeExclusive(const SkDescriptor&);
void purgeAll(); // does not change budget
int getCacheCountLimit() const;
int setCacheCountLimit(int limit);
int getCacheCountUsed() const;
size_t getCacheSizeLimit() const;
size_t setCacheSizeLimit(size_t limit);
size_t getTotalMemoryUsed() const;
int getCachePointSizeLimit() const;
int setCachePointSizeLimit(int limit);
#ifdef SK_DEBUG
void validate() const;
#else
void validate() const {}
#endif
private:
friend class SkGlyphCache;
template <typename T>
struct Node {
Node(const SkDescriptor& desc) : fDesc{desc} {}
const SkDescriptor& getDescriptor() const {return *fDesc.getDesc(); }
T* fNext{nullptr};
T* fPrev{nullptr};
SkAutoDescriptor fDesc;
};
// The following methods can only be called when mutex is already held.
SkGlyphCache* internalGetHead() const { return fHead; }
SkGlyphCache* internalGetTail() const;
void internalDetachCache(SkGlyphCache*);
void internalAttachCacheToHead(SkGlyphCache*);
// Checkout budgets, modulated by the specified min-bytes-needed-to-purge,
// and attempt to purge caches to match.
// Returns number of bytes freed.
size_t internalPurge(size_t minBytesNeeded = 0);
void forEachStrike(std::function<void(const SkGlyphCache&)> visitor) const;
mutable SkSpinlock fLock;
SkGlyphCache* fHead{nullptr};
size_t fTotalMemoryUsed{0};
size_t fCacheSizeLimit{SK_DEFAULT_FONT_CACHE_LIMIT};
int32_t fCacheCountLimit{SK_DEFAULT_FONT_CACHE_COUNT_LIMIT};
int32_t fCacheCount{0};
int32_t fPointSizeLimit{SK_DEFAULT_FONT_CACHE_POINT_SIZE_LIMIT};
};
using SkExclusiveStrikePtr = SkStrikeCache::ExclusiveStrikePtr;
#endif // SkStrikeCache_DEFINED
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