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26 #ifndef DiscardablePixelRef_h
27 #define DiscardablePixelRef_h
30 #include "SkPixelRef.h"
32 #include "platform/PlatformExport.h"
33 #include "public/platform/WebDiscardableMemory.h"
34 #include "wtf/OwnPtr.h"
35 #include "wtf/PassOwnPtr.h"
39 // Class for allocating the DiscardablePixelRef object.
40 class PLATFORM_EXPORT DiscardablePixelRefAllocator : public SkBitmap::Allocator {
41 // SkBitmap::Allocator implementation. The discardable memory allocated
42 // after this call is locked and will not be purged until next
44 virtual bool allocPixelRef(SkBitmap*, SkColorTable*) OVERRIDE;
47 // PixelRef object whose memory can be discarded when pixels are unlocked.
48 class PLATFORM_EXPORT DiscardablePixelRef : public SkPixelRef {
50 DiscardablePixelRef(const SkImageInfo&, size_t rowBytes, PassOwnPtr<SkMutex>);
51 virtual ~DiscardablePixelRef();
53 static bool isDiscardable(SkPixelRef*);
54 bool allocAndLockDiscardableMemory(size_t);
57 // SkPixelRef implementation.
58 virtual bool onNewLockPixels(LockRec*) OVERRIDE;
59 virtual void onUnlockPixels() OVERRIDE;
63 OwnPtr<WebDiscardableMemory> m_discardable;
64 OwnPtr<SkMutex> m_mutex;