Big Cleanup: SkBitmapFactory, SkLazyPixelRef, SkImageCache

src/lazy/SkDiscardableMemoryPool.h

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkDiscardableMemoryPool_DEFINED
+#define SkDiscardableMemoryPool_DEFINED
+
+#include "SkDiscardableMemory.h"
+#include "SkTInternalLList.h"
+#include "SkThread.h"
+
+#ifdef SK_DEBUG
+    #define LAZY_CACHE_STATS 1
+#elif !defined(LAZY_CACHE_STATS)
+    #define LAZY_CACHE_STATS 0
+#endif
+
+/**
+ *  This non-global pool can be used for unit tests to verify that the
+ *  pool works.
+ */
+class SkPoolDiscardableMemory;
+class SkDiscardableMemoryPool : public SkDiscardableMemory::Factory {
+public:
+    /**
+     *  Without mutex, will be not be thread safe.
+     */
+    SkDiscardableMemoryPool(size_t budget, SkBaseMutex* mutex = NULL);
+    ~SkDiscardableMemoryPool();
+    SkDiscardableMemory* create(size_t bytes) SK_OVERRIDE;
+    size_t getRAMUsed();
+    void setRAMBudget(size_t budget);
+    /** purges all unlocked DMs */
+    void dumpPool();
+    friend class SkPoolDiscardableMemory;
+    #if LAZY_CACHE_STATS
+    int          fCacheHits;
+    int          fCacheMisses;
+    #endif  // LAZY_CACHE_STATS
+
+private:
+    SkBaseMutex* fMutex;
+    size_t       fBudget;
+    size_t       fUsed;
+    SkTInternalLList<SkPoolDiscardableMemory> fList;
+    /** Function called to free memory if needed */
+    void dumpDownTo(size_t budget);
+    /** called by SkDiscardableMemoryPool upon destruction */
+    void free(SkPoolDiscardableMemory* dm);
+    /** called by SkDiscardableMemoryPool::lock() */
+    bool lock(SkPoolDiscardableMemory* dm);
+    /** called by SkDiscardableMemoryPool::unlock() */
+    void unlock(SkPoolDiscardableMemory* dm);
+    typedef SkDiscardableMemory::Factory INHERITED;
+};
+
+/**
+ *  Returns (and creates if needed) a threadsafe global
+ *  SkDiscardableMemoryPool.
+ */
+SkDiscardableMemoryPool* SkGetGlobalDiscardableMemoryPool();
+
+#if !defined(SK_DEFAULT_GLOBAL_DISCARDABLE_MEMORY_POOL_SIZE)
+#define SK_DEFAULT_GLOBAL_DISCARDABLE_MEMORY_POOL_SIZE (128 * 1024 * 1024)
+#endif
+
+#endif  // SkDiscardableMemoryPool_DEFINED
+