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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 SkGlyphCache_Globals_DEFINED
#define SkGlyphCache_Globals_DEFINED
#include "SkGlyphCache.h"
#include "SkMutex.h"
#include "SkTLS.h"
#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
///////////////////////////////////////////////////////////////////////////////
class SkMutex;
class SkGlyphCache_Globals {
public:
enum UseMutex {
kNo_UseMutex, // thread-local cache
kYes_UseMutex // shared cache
};
SkGlyphCache_Globals(UseMutex um) {
fHead = NULL;
fTotalMemoryUsed = 0;
fCacheSizeLimit = SK_DEFAULT_FONT_CACHE_LIMIT;
fCacheCount = 0;
fCacheCountLimit = SK_DEFAULT_FONT_CACHE_COUNT_LIMIT;
fMutex = (kYes_UseMutex == um) ? SkNEW(SkMutex) : NULL;
}
~SkGlyphCache_Globals() {
SkGlyphCache* cache = fHead;
while (cache) {
SkGlyphCache* next = cache->fNext;
SkDELETE(cache);
cache = next;
}
SkDELETE(fMutex);
}
SkMutex* fMutex;
SkGlyphCache* internalGetHead() const { return fHead; }
SkGlyphCache* internalGetTail() const;
size_t getTotalMemoryUsed() const { return fTotalMemoryUsed; }
int getCacheCountUsed() const { return fCacheCount; }
#ifdef SK_DEBUG
void validate() const;
#else
void validate() const {}
#endif
int getCacheCountLimit() const { return fCacheCountLimit; }
int setCacheCountLimit(int limit);
size_t getCacheSizeLimit() const { return fCacheSizeLimit; }
size_t setCacheSizeLimit(size_t limit);
// returns true if this cache is over-budget either due to size limit
// or count limit.
bool isOverBudget() const {
return fCacheCount > fCacheCountLimit ||
fTotalMemoryUsed > fCacheSizeLimit;
}
void purgeAll(); // does not change budget
// call when a glyphcache is available for caching (i.e. not in use)
void attachCacheToHead(SkGlyphCache*);
// can only be called when the mutex is already held
void internalDetachCache(SkGlyphCache*);
void internalAttachCacheToHead(SkGlyphCache*);
// can return NULL
static SkGlyphCache_Globals* FindTLS() {
return (SkGlyphCache_Globals*)SkTLS::Find(CreateTLS);
}
static SkGlyphCache_Globals& GetTLS() {
return *(SkGlyphCache_Globals*)SkTLS::Get(CreateTLS, DeleteTLS);
}
static void DeleteTLS() { SkTLS::Delete(CreateTLS); }
private:
SkGlyphCache* fHead;
size_t fTotalMemoryUsed;
size_t fCacheSizeLimit;
int32_t fCacheCountLimit;
int32_t fCacheCount;
// 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);
static void* CreateTLS() {
return SkNEW_ARGS(SkGlyphCache_Globals, (kNo_UseMutex));
}
static void DeleteTLS(void* ptr) {
SkDELETE((SkGlyphCache_Globals*)ptr);
}
};
#endif
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