root/Source/platform/graphics/LazyDecodingPixelRef.h

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INCLUDED FROM


/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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#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 FINAL : 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() OVERRIDE;
    virtual bool PrepareToDecode(const LazyPixelRef::PrepareParams&) OVERRIDE;
    virtual void Decode() OVERRIDE;

protected:
    // SkPixelRef implementation.
    virtual bool onNewLockPixels(LockRec*) OVERRIDE;
    virtual void onUnlockPixels() OVERRIDE;
    virtual bool onLockPixelsAreWritable() const OVERRIDE;

    virtual SkData* onRefEncodedData() 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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