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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 "platform/PlatformExport.h"
#include "platform/image-decoders/ImageDecoder.h"
#include "platform/image-decoders/SegmentReader.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkSize.h"
#include "third_party/skia/include/core/SkTypes.h"
#include "wtf/Allocator.h"
#include "wtf/Noncopyable.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/ThreadSafeRefCounted.h"
#include "wtf/ThreadingPrimitives.h"
#include "wtf/Vector.h"
#include <memory>
struct SkYUVSizeInfo;
namespace blink {
class ImageDecoder;
class PLATFORM_EXPORT ImageDecoderFactory {
USING_FAST_MALLOC(ImageDecoderFactory);
WTF_MAKE_NONCOPYABLE(ImageDecoderFactory);
public:
ImageDecoderFactory() {}
virtual ~ImageDecoderFactory() {}
virtual std::unique_ptr<ImageDecoder> create() = 0;
};
class PLATFORM_EXPORT ImageFrameGenerator final
: public ThreadSafeRefCounted<ImageFrameGenerator> {
WTF_MAKE_NONCOPYABLE(ImageFrameGenerator);
public:
static PassRefPtr<ImageFrameGenerator> create(
const SkISize& fullSize,
bool isMultiFrame,
const ColorBehavior& colorBehavior) {
return adoptRef(
new ImageFrameGenerator(fullSize, isMultiFrame, colorBehavior));
}
~ImageFrameGenerator();
// Decodes and scales the specified frame at |index|. The dimensions and
// output format are given in SkImageInfo. Decoded pixels are written into
// |pixels| with a stride of |rowBytes|. Returns true if decoding was
// successful.
bool decodeAndScale(SegmentReader*,
bool allDataReceived,
size_t index,
const SkImageInfo&,
void* pixels,
size_t rowBytes);
// Decodes YUV components directly into the provided memory planes. Must not
// be called unless getYUVComponentSizes has been called and returned true.
// YUV decoding does not currently support progressive decoding. In order to
// support it, ImageDecoder needs something analagous to its ImageFrame cache
// to hold partial planes, and the GPU code needs to handle them.
bool decodeToYUV(SegmentReader*,
size_t index,
const SkISize componentSizes[3],
void* planes[3],
const size_t rowBytes[3]);
const SkISize& getFullSize() const { return m_fullSize; }
bool isMultiFrame() const { return m_isMultiFrame; }
bool decodeFailed() const { return m_decodeFailed; }
bool hasAlpha(size_t index);
// Must not be called unless the SkROBuffer has all the data. YUV decoding
// does not currently support progressive decoding. See comment above on
// decodeToYUV().
bool getYUVComponentSizes(SegmentReader*, SkYUVSizeInfo*);
private:
ImageFrameGenerator(const SkISize& fullSize,
bool isMultiFrame,
const ColorBehavior&);
friend class ImageFrameGeneratorTest;
friend class DeferredImageDecoderTest;
// For testing. |factory| will overwrite the default ImageDecoder creation
// logic if |factory->create()| returns non-zero.
void setImageDecoderFactory(std::unique_ptr<ImageDecoderFactory> factory) {
m_imageDecoderFactory = std::move(factory);
}
void setHasAlpha(size_t index, bool hasAlpha);
SkBitmap tryToResumeDecode(SegmentReader*,
bool allDataReceived,
size_t index,
const SkISize& scaledSize,
SkBitmap::Allocator*);
// This method should only be called while m_decodeMutex is locked.
bool decode(SegmentReader*,
bool allDataReceived,
size_t index,
ImageDecoder**,
SkBitmap*,
SkBitmap::Allocator*);
const SkISize m_fullSize;
// Parameters used to create internal ImageDecoder objects.
const ColorBehavior m_decoderColorBehavior;
const bool m_isMultiFrame;
bool m_decodeFailed;
bool m_yuvDecodingFailed;
size_t m_frameCount;
Vector<bool> m_hasAlpha;
std::unique_ptr<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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