1 files changed, 65 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/lazy/SkDiscardableMemoryPool.h b/gfx/skia/skia/src/lazy/SkDiscardableMemoryPool.h
new file mode 100644
index 0000000000..61aedc279f
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+++ b/gfx/skia/skia/src/lazy/SkDiscardableMemoryPool.h
@@ -0,0 +1,65 @@
+/*
+ * 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 "include/private/base/SkMutex.h"
+#include "include/private/chromium/SkDiscardableMemory.h"
+
+#ifndef SK_LAZY_CACHE_STATS
+    #ifdef SK_DEBUG
+        #define SK_LAZY_CACHE_STATS 1
+    #else
+        #define SK_LAZY_CACHE_STATS 0
+    #endif
+#endif
+
+/**
+ *  An implementation of Discardable Memory that manages a fixed-size
+ *  budget of memory.  When the allocated memory exceeds this size,
+ *  unlocked blocks of memory are purged.  If all memory is locked, it
+ *  can exceed the memory-use budget.
+ */
+class SkDiscardableMemoryPool : public SkDiscardableMemory::Factory {
+public:
+    virtual size_t getRAMUsed() = 0;
+    virtual void setRAMBudget(size_t budget) = 0;
+    virtual size_t getRAMBudget() = 0;
+
+    /** purges all unlocked DMs */
+    virtual void dumpPool() = 0;
+
+    #if SK_LAZY_CACHE_STATS
+    /**
+     * These two values are a count of the number of successful and
+     * failed calls to SkDiscardableMemory::lock() for all DMs managed
+     * by this pool.
+     */
+    virtual int getCacheHits() = 0;
+    virtual int getCacheMisses() = 0;
+    virtual void resetCacheHitsAndMisses() = 0;
+    #endif
+
+    /**
+     *  This non-global pool can be used for unit tests to verify that
+     *  the pool works.
+     */
+    static sk_sp<SkDiscardableMemoryPool> Make(size_t size);
+};
+
+/**
+ *  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