ef284a84f5
missing unrefs in megalooper GM missing reset capability in oval renderer This CL also expands the instance counting system to some recently adding classes (e.g., SkFontStyleSet) R=bsalomon@google.com, jvanverth@google.com Author: robertphillips@google.com Review URL: https://chromiumcodereview.appspot.com/18461007 git-svn-id: http://skia.googlecode.com/svn/trunk@10030 2bbb7eff-a529-9590-31e7-b0007b416f81
92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkLruImageCache_DEFINED
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#define SkLruImageCache_DEFINED
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#include "SkImageCache.h"
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#include "SkThread.h"
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#include "SkTInternalLList.h"
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class CachedPixels;
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/**
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* SkImageCache implementation that uses an LRU cache to age out old images.
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*/
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class SkLruImageCache : public SkImageCache {
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public:
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SK_DECLARE_INST_COUNT(SkLruImageCache)
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SkLruImageCache(size_t budget);
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virtual ~SkLruImageCache();
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#ifdef SK_DEBUG
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virtual MemoryStatus getMemoryStatus(ID) const SK_OVERRIDE;
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virtual void purgeAllUnpinnedCaches() SK_OVERRIDE;
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#endif
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/**
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* Set the byte limit on cached pixels. If more bytes are used than this, the cache will free
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* unpinned memory until under the new limit or until all unpinned memory is freed. This will
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* never free pinned memory, so the cache can potentially remain over the limit. The limit is
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* enforced each time memory is allocated or released.
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* 0 is a special flag for an infinite budget.
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* @return size_t The previous limit.
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*/
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size_t setImageCacheLimit(size_t newLimit);
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/**
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* Return the number of bytes of memory currently in use by the cache. Can include memory that
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* is no longer pinned, but has not been freed.
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*/
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size_t getImageCacheUsed() const { return fRamUsed; }
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virtual void* allocAndPinCache(size_t bytes, ID*) SK_OVERRIDE;
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virtual void* pinCache(ID, SkImageCache::DataStatus*) SK_OVERRIDE;
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virtual void releaseCache(ID) SK_OVERRIDE;
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virtual void throwAwayCache(ID) SK_OVERRIDE;
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private:
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// Linked list of recently used. Head is the most recently used, and tail is the least.
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SkTInternalLList<CachedPixels> fLRU;
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typedef SkTInternalLList<CachedPixels>::Iter Iter;
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#ifdef SK_DEBUG
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// fMutex is mutable so that getMemoryStatus can be const
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mutable
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#endif
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SkMutex fMutex;
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size_t fRamBudget;
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size_t fRamUsed;
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/**
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* Find the CachedPixels represented by ID, or NULL if not in the cache. Mutex must be locked
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* before calling.
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*/
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CachedPixels* findByID(ID) const;
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/**
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* If over budget, throw away pixels which are not currently in use until below budget or there
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* are no more pixels eligible to be thrown away. Mutex must be locked before calling.
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*/
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void purgeIfNeeded();
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/**
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* Purge until below limit. Mutex must be locked before calling.
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*/
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void purgeTilAtOrBelow(size_t limit);
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/**
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* Remove a set of CachedPixels. Mutex must be locked before calling.
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*/
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void removePixels(CachedPixels*);
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};
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#endif // SkLruImageCache_DEFINED
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