/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DiscardablePixelRef_h
#define DiscardablePixelRef_h
#include "SkBitmap.h"
#include "SkPixelRef.h"
#include "platform/PlatformExport.h"
#include "public/platform/WebDiscardableMemory.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassOwnPtr.h"
namespace WebCore {
// Class for allocating the DiscardablePixelRef object.
class PLATFORM_EXPORT DiscardablePixelRefAllocator : public SkBitmap::Allocator {
// SkBitmap::Allocator implementation. The discardable memory allocated
// after this call is locked and will not be purged until next
// onUnlockPixels().
virtual bool allocPixelRef(SkBitmap*, SkColorTable*) OVERRIDE;
};
// PixelRef object whose memory can be discarded when pixels are unlocked.
class PLATFORM_EXPORT DiscardablePixelRef : public SkPixelRef {
public:
DiscardablePixelRef(const SkImageInfo&, size_t rowBytes, PassOwnPtr<SkMutex>);
virtual ~DiscardablePixelRef();
static bool isDiscardable(SkPixelRef*);
bool allocAndLockDiscardableMemory(size_t);
SK_DECLARE_UNFLATTENABLE_OBJECT()
protected:
// SkPixelRef implementation.
virtual bool onNewLockPixels(LockRec*) OVERRIDE;
virtual void onUnlockPixels() OVERRIDE;
private:
void* m_lockedMemory;
OwnPtr<blink::WebDiscardableMemory> m_discardable;
OwnPtr<SkMutex> m_mutex;
size_t m_rowBytes;
};
} // namespace WebCore
#endif