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1 /* | 1 /* |
2 * Copyright 2013 Google Inc. | 2 * Copyright 2013 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkLruImageCache.h" | 8 #include "SkLruImageCache.h" |
9 | 9 |
10 static intptr_t NextGenerationID() { | 10 static intptr_t NextGenerationID() { |
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80 if (NULL == pixels) { | 80 if (NULL == pixels) { |
81 return SkImageCache::kThrownAway_CacheStatus; | 81 return SkImageCache::kThrownAway_CacheStatus; |
82 } | 82 } |
83 if (pixels->isLocked()) { | 83 if (pixels->isLocked()) { |
84 return SkImageCache::kPinned_CacheStatus; | 84 return SkImageCache::kPinned_CacheStatus; |
85 } | 85 } |
86 return SkImageCache::kUnpinned_CacheStatus; | 86 return SkImageCache::kUnpinned_CacheStatus; |
87 } | 87 } |
88 #endif | 88 #endif |
89 | 89 |
90 void SkLruImageCache::setBudget(size_t newBudget) { | 90 size_t SkLruImageCache::setImageCacheLimit(size_t newLimit) { |
| 91 size_t oldLimit = fRamBudget; |
91 SkAutoMutexAcquire ac(&fMutex); | 92 SkAutoMutexAcquire ac(&fMutex); |
92 fRamBudget = newBudget; | 93 fRamBudget = newLimit; |
93 this->purgeIfNeeded(); | 94 this->purgeIfNeeded(); |
| 95 return oldLimit; |
94 } | 96 } |
95 | 97 |
96 void* SkLruImageCache::allocAndPinCache(size_t bytes, intptr_t* ID) { | 98 void* SkLruImageCache::allocAndPinCache(size_t bytes, intptr_t* ID) { |
97 SkAutoMutexAcquire ac(&fMutex); | 99 SkAutoMutexAcquire ac(&fMutex); |
98 CachedPixels* pixels = SkNEW_ARGS(CachedPixels, (bytes)); | 100 CachedPixels* pixels = SkNEW_ARGS(CachedPixels, (bytes)); |
99 if (ID != NULL) { | 101 if (ID != NULL) { |
100 *ID = pixels->getID(); | 102 *ID = pixels->getID(); |
101 } | 103 } |
102 pixels->lock(); | 104 pixels->lock(); |
103 fRamUsed += bytes; | 105 fRamUsed += bytes; |
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161 if (pixels->getID() == ID) { | 163 if (pixels->getID() == ID) { |
162 return pixels; | 164 return pixels; |
163 } | 165 } |
164 pixels = iter.next(); | 166 pixels = iter.next(); |
165 } | 167 } |
166 return NULL; | 168 return NULL; |
167 } | 169 } |
168 | 170 |
169 void SkLruImageCache::purgeIfNeeded() { | 171 void SkLruImageCache::purgeIfNeeded() { |
170 // Mutex is already locked. | 172 // Mutex is already locked. |
171 this->purgeTilAtOrBelow(fRamBudget); | 173 if (fRamBudget > 0) { |
| 174 this->purgeTilAtOrBelow(fRamBudget); |
| 175 } |
172 } | 176 } |
173 | 177 |
174 void SkLruImageCache::purgeTilAtOrBelow(size_t limit) { | 178 void SkLruImageCache::purgeTilAtOrBelow(size_t limit) { |
175 // Mutex is already locked. | 179 // Mutex is already locked. |
176 if (fRamUsed > limit) { | 180 if (fRamUsed > limit) { |
177 Iter iter; | 181 Iter iter; |
178 // Start from the tail, least recently used. | 182 // Start from the tail, least recently used. |
179 CachedPixels* pixels = iter.init(fLRU, Iter::kTail_IterStart); | 183 CachedPixels* pixels = iter.init(fLRU, Iter::kTail_IterStart); |
180 while (pixels != NULL && fRamUsed > limit) { | 184 while (pixels != NULL && fRamUsed > limit) { |
181 CachedPixels* prev = iter.prev(); | 185 CachedPixels* prev = iter.prev(); |
182 if (!pixels->isLocked()) { | 186 if (!pixels->isLocked()) { |
183 this->removePixels(pixels); | 187 this->removePixels(pixels); |
184 } | 188 } |
185 pixels = prev; | 189 pixels = prev; |
186 } | 190 } |
187 } | 191 } |
188 } | 192 } |
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