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295f920116
I wrote a script to do this which is attached to the bug. TBR=abarth@chromium.org BUG=435361 Review URL: https://codereview.chromium.org/736373003
95 lines
3.9 KiB
C++
95 lines
3.9 KiB
C++
/*
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* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_PLATFORM_IMAGE_DECODERS_GIF_GIFIMAGEDECODER_H_
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#define SKY_ENGINE_PLATFORM_IMAGE_DECODERS_GIF_GIFIMAGEDECODER_H_
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#include "platform/image-decoders/ImageDecoder.h"
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#include "sky/engine/wtf/Noncopyable.h"
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#include "sky/engine/wtf/OwnPtr.h"
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typedef Vector<unsigned char> GIFRow;
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namespace blink {
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class GIFImageReader;
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// This class decodes the GIF image format.
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class PLATFORM_EXPORT GIFImageDecoder : public ImageDecoder {
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WTF_MAKE_NONCOPYABLE(GIFImageDecoder);
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public:
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GIFImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption, size_t maxDecodedBytes);
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virtual ~GIFImageDecoder();
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enum GIFParseQuery { GIFSizeQuery, GIFFrameCountQuery };
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// ImageDecoder
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virtual String filenameExtension() const override { return "gif"; }
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virtual void setData(SharedBuffer* data, bool allDataReceived) override;
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virtual bool isSizeAvailable() override;
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virtual size_t frameCount() override;
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virtual int repetitionCount() const override;
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virtual ImageFrame* frameBufferAtIndex(size_t) override;
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virtual bool frameIsCompleteAtIndex(size_t) const override;
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virtual float frameDurationAtIndex(size_t) const override;
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virtual size_t clearCacheExceptFrame(size_t) override;
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// CAUTION: setFailed() deletes |m_reader|. Be careful to avoid
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// accessing deleted memory, especially when calling this from inside
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// GIFImageReader!
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virtual bool setFailed() override;
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// Callbacks from the GIF reader.
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bool haveDecodedRow(size_t frameIndex, GIFRow::const_iterator rowBegin, size_t width, size_t rowNumber, unsigned repeatCount, bool writeTransparentPixels);
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bool frameComplete(size_t frameIndex);
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// For testing.
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bool parseCompleted() const;
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private:
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virtual void clearFrameBuffer(size_t frameIndex) override;
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// Parses as much as is needed to answer the query, ignoring bitmap
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// data. If parsing fails, sets the "decode failure" flag.
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void parse(GIFParseQuery);
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// Decodes bitmap data of the frame. Depending on the disposal method
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// of prior frames, also decodes all required prior frames. If decoding
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// fails, sets the "decode failure" flag.
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void decode(size_t frameIndex);
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// Called to initialize the frame buffer with the given index, based on
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// the previous frame's disposal method. Returns true on success. On
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// failure, this will mark the image as failed.
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bool initFrameBuffer(size_t frameIndex);
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bool m_currentBufferSawAlpha;
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mutable int m_repetitionCount;
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OwnPtr<GIFImageReader> m_reader;
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};
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} // namespace blink
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#endif // SKY_ENGINE_PLATFORM_IMAGE_DECODERS_GIF_GIFIMAGEDECODER_H_
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