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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 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 ImageFrameGenerator_h
#define ImageFrameGenerator_h
#include "SkTypes.h"
#include "SkBitmap.h"
#include "SkSize.h"
#include <wtf/PassOwnPtr.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/ThreadingPrimitives.h>
namespace WebCore {
class ImageDecoder;
class ScaledImageFragment;
class SharedBuffer;
class ImageDecoderFactory {
public:
virtual ~ImageDecoderFactory() { }
virtual PassOwnPtr<ImageDecoder> create() = 0;
};
class ImageFrameGenerator : public ThreadSafeRefCounted<ImageFrameGenerator> {
public:
static PassRefPtr<ImageFrameGenerator> create(const SkISize& fullSize, PassRefPtr<SharedBuffer> data, bool allDataReceived)
{
return adoptRef(new ImageFrameGenerator(fullSize, data, allDataReceived));
}
ImageFrameGenerator(const SkISize& fullSize, PassRefPtr<SharedBuffer>, bool allDataReceived);
~ImageFrameGenerator();
const ScaledImageFragment* decodeAndScale(const SkISize& scaledSize);
void setData(PassRefPtr<SharedBuffer>, bool allDataReceived);
void setImageDecoderFactoryForTesting(PassOwnPtr<ImageDecoderFactory> factory) { m_imageDecoderFactory = factory; }
private:
// These methods are called while m_decodeMutex is locked.
const ScaledImageFragment* tryToLockCache(const SkISize& scaledSize);
const ScaledImageFragment* tryToScale(const ScaledImageFragment* fullSizeImage, const SkISize& scaledSize);
const ScaledImageFragment* tryToDecodeAndScale(const SkISize& scaledSize);
SkISize m_fullSize;
RefPtr<SharedBuffer> m_data;
bool m_allDataReceived;
OwnPtr<ImageDecoderFactory> m_imageDecoderFactory;
// Prevents multiple decode operations on the same data.
Mutex m_decodeMutex;
// Prevents concurrent access to m_data.
Mutex m_dataMutex;
};
} // namespace WebCore
#endif
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