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/*
* Copyright (C) 2012 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 AND ITS CONTRIBUTORS "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 OR ITS 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 LazyDecodingPixelRef_h
#define LazyDecodingPixelRef_h
#include "SkFlattenableBuffers.h"
#include "SkPixelRef.h"
#include "SkRect.h"
#include "SkSize.h"
#include "SkTypes.h"
#include "platform/PlatformInstrumentation.h"
#include "skia/ext/lazy_pixel_ref.h"
#include "wtf/RefPtr.h"
using skia::LazyPixelRef;
class SkData;
namespace WebCore {
class ImageFrameGenerator;
class ScaledImageFragment;
class LazyDecodingPixelRef : public LazyPixelRef {
public:
LazyDecodingPixelRef(const SkImageInfo&, PassRefPtr<ImageFrameGenerator>, size_t index);
virtual ~LazyDecodingPixelRef();
SK_DECLARE_UNFLATTENABLE_OBJECT()
PassRefPtr<ImageFrameGenerator> frameGenerator() const { return m_frameGenerator; }
size_t frameIndex() const { return m_frameIndex; }
// Returns true if the image might already be decoded in the cache.
// Optimistic version of PrepareToDecode; requires less locking.
virtual bool MaybeDecoded();
virtual bool PrepareToDecode(const LazyPixelRef::PrepareParams&);
virtual void Decode();
protected:
// SkPixelRef implementation.
virtual void* onLockPixels(SkColorTable**);
virtual void onUnlockPixels();
virtual bool onLockPixelsAreWritable() const;
virtual SkData* onRefEncodedData() SK_OVERRIDE;
private:
RefPtr<ImageFrameGenerator> m_frameGenerator;
size_t m_frameIndex;
const ScaledImageFragment* m_lockedImageResource;
PlatformInstrumentation::LazyPixelRefTracker m_objectTracker;
};
} // namespace WebCore
#endif // LazyDecodingPixelRef_h_
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