1 /* 2 * Copyright 2010 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkGlyphCache_Globals_DEFINED 9 #define SkGlyphCache_Globals_DEFINED 10 11 #include "SkGlyphCache.h" 12 #include "SkMutex.h" 13 #include "SkSpinlock.h" 14 #include "SkTLS.h" 15 16 #ifndef SK_DEFAULT_FONT_CACHE_COUNT_LIMIT 17 #define SK_DEFAULT_FONT_CACHE_COUNT_LIMIT 2048 18 #endif 19 20 #ifndef SK_DEFAULT_FONT_CACHE_LIMIT 21 #define SK_DEFAULT_FONT_CACHE_LIMIT (2 * 1024 * 1024) 22 #endif 23 24 /////////////////////////////////////////////////////////////////////////////// 25 26 class SkGlyphCache_Globals { 27 public: SkGlyphCache_Globals()28 SkGlyphCache_Globals() { 29 fHead = nullptr; 30 fTotalMemoryUsed = 0; 31 fCacheSizeLimit = SK_DEFAULT_FONT_CACHE_LIMIT; 32 fCacheCount = 0; 33 fCacheCountLimit = SK_DEFAULT_FONT_CACHE_COUNT_LIMIT; 34 } 35 ~SkGlyphCache_Globals()36 ~SkGlyphCache_Globals() { 37 SkGlyphCache* cache = fHead; 38 while (cache) { 39 SkGlyphCache* next = cache->fNext; 40 delete cache; 41 cache = next; 42 } 43 } 44 45 SkSpinlock fLock; 46 internalGetHead()47 SkGlyphCache* internalGetHead() const { return fHead; } 48 SkGlyphCache* internalGetTail() const; 49 getTotalMemoryUsed()50 size_t getTotalMemoryUsed() const { return fTotalMemoryUsed; } getCacheCountUsed()51 int getCacheCountUsed() const { return fCacheCount; } 52 53 #ifdef SK_DEBUG 54 void validate() const; 55 #else validate()56 void validate() const {} 57 #endif 58 getCacheCountLimit()59 int getCacheCountLimit() const { return fCacheCountLimit; } 60 int setCacheCountLimit(int limit); 61 getCacheSizeLimit()62 size_t getCacheSizeLimit() const { return fCacheSizeLimit; } 63 size_t setCacheSizeLimit(size_t limit); 64 65 // returns true if this cache is over-budget either due to size limit 66 // or count limit. isOverBudget()67 bool isOverBudget() const { 68 return fCacheCount > fCacheCountLimit || 69 fTotalMemoryUsed > fCacheSizeLimit; 70 } 71 72 void purgeAll(); // does not change budget 73 74 // call when a glyphcache is available for caching (i.e. not in use) 75 void attachCacheToHead(SkGlyphCache*); 76 77 // can only be called when the mutex is already held 78 void internalDetachCache(SkGlyphCache*); 79 void internalAttachCacheToHead(SkGlyphCache*); 80 81 private: 82 SkGlyphCache* fHead; 83 size_t fTotalMemoryUsed; 84 size_t fCacheSizeLimit; 85 int32_t fCacheCountLimit; 86 int32_t fCacheCount; 87 88 // Checkout budgets, modulated by the specified min-bytes-needed-to-purge, 89 // and attempt to purge caches to match. 90 // Returns number of bytes freed. 91 size_t internalPurge(size_t minBytesNeeded = 0); 92 }; 93 94 #endif 95