bool ImageDecodingStore::lockCache(const ImageFrameGenerator* generator, const SkISize& scaledSize, CacheCondition condition, const ScaledImageFragment** cachedImage, ImageDecoder** decoder)
{
ASSERT(cachedImage);
CacheEntry* cacheEntry = 0;
Vector<OwnPtr<CacheEntry> > cacheEntriesToDelete;
{
MutexLocker lock(m_mutex);
CacheMap::iterator iter = m_cacheMap.find(std::make_pair(generator, scaledSize));
if (iter == m_cacheMap.end())
return false;
cacheEntry = iter->value.get();
ScaledImageFragment* image = cacheEntry->cachedImage();
if (condition == CacheMustBeComplete && !image->isComplete())
return false;
// Incomplete cache entry cannot be used more than once.
ASSERT(image->isComplete() || !cacheEntry->useCount());
image->bitmap().lockPixels();
if (image->bitmap().getPixels()) {
// Increment use count such that it doesn't get evicted.
cacheEntry->incrementUseCount();
// Complete cache entry doesn't have a decoder.
ASSERT(!image->isComplete() || !cacheEntry->cachedDecoder());
if (decoder)
*decoder = cacheEntry->cachedDecoder();
*cachedImage = image;
} else {
image->bitmap().unlockPixels();
removeFromCacheInternal(cacheEntry, &cacheEntriesToDelete);
removeFromCacheListInternal(cacheEntriesToDelete);
return false;
}
}
return true;
}
