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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 "SkBitmap.h"
#include "SkSize.h"
#include "SkTypes.h"
#include "platform/PlatformExport.h"
#include "platform/graphics/ThreadSafeDataTransport.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/ThreadingPrimitives.h"
#include "wtf/ThreadSafeRefCounted.h"
#include "wtf/Vector.h"
namespace blink {
class ImageDecoder;
class SharedBuffer;
class PLATFORM_EXPORT ImageDecoderFactory {
WTF_MAKE_NONCOPYABLE(ImageDecoderFactory);
public:
ImageDecoderFactory() {}
virtual ~ImageDecoderFactory() { }
virtual PassOwnPtr<ImageDecoder> create() = 0;
};
class PLATFORM_EXPORT ImageFrameGenerator : public ThreadSafeRefCounted<ImageFrameGenerator> {
WTF_MAKE_NONCOPYABLE(ImageFrameGenerator);
public:
static PassRefPtr<ImageFrameGenerator> create(const SkISize& fullSize, PassRefPtr<SharedBuffer> data, bool allDataReceived, bool isMultiFrame = false)
{
return adoptRef(new ImageFrameGenerator(fullSize, data, allDataReceived, isMultiFrame));
}
ImageFrameGenerator(const SkISize& fullSize, PassRefPtr<SharedBuffer>, bool allDataReceived, bool isMultiFrame);
~ImageFrameGenerator();
// Decodes and scales the specified frame indicated by |index|. Dimensions
// and output format are specified in |info|. Decoded pixels are written
// into |pixels| with a stride of |rowBytes|.
//
// Returns true if decoding was successful.
bool decodeAndScale(const SkImageInfo&, size_t index, void* pixels, size_t rowBytes);
// Decodes YUV components directly into the provided memory planes.
bool decodeToYUV(SkISize componentSizes[3], void* planes[3], size_t rowBytes[3]);
void setData(PassRefPtr<SharedBuffer>, bool allDataReceived);
// Creates a new SharedBuffer containing the data received so far.
void copyData(RefPtr<SharedBuffer>*, bool* allDataReceived);
SkISize getFullSize() const { return m_fullSize; }
bool isMultiFrame() const { return m_isMultiFrame; }
// FIXME: Return alpha state for each frame.
bool hasAlpha(size_t);
bool getYUVComponentSizes(SkISize componentSizes[3]);
private:
class ExternalMemoryAllocator;
friend class ImageFrameGeneratorTest;
friend class DeferredImageDecoderTest;
// For testing. |factory| will overwrite the default ImageDecoder creation logic if |factory->create()| returns non-zero.
void setImageDecoderFactory(PassOwnPtr<ImageDecoderFactory> factory) { m_imageDecoderFactory = factory; }
void setHasAlpha(size_t index, bool hasAlpha);
// These methods are called while m_decodeMutex is locked.
SkBitmap tryToResumeDecode(const SkISize& scaledSize, size_t index);
// Use the given decoder to decode. If a decoder is not given then try to create one.
// Returns true if decoding was complete.
bool decode(size_t index, ImageDecoder**, SkBitmap*);
SkISize m_fullSize;
ThreadSafeDataTransport m_data;
bool m_isMultiFrame;
bool m_decodeFailedAndEmpty;
Vector<bool> m_hasAlpha;
int m_decodeCount;
Vector<bool> m_frameComplete;
size_t m_frameCount;
OwnPtr<ExternalMemoryAllocator> m_externalAllocator;
OwnPtr<ImageDecoderFactory> m_imageDecoderFactory;
// Prevents multiple decode operations on the same data.
Mutex m_decodeMutex;
// Protect concurrent access to m_hasAlpha.
Mutex m_alphaMutex;
};
} // namespace blink
#endif
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