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1 /* | 1 /* |
2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. | 2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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39 // This class decodes the GIF image format. | 39 // This class decodes the GIF image format. |
40 class PLATFORM_EXPORT GIFImageDecoder : public ImageDecoder { | 40 class PLATFORM_EXPORT GIFImageDecoder : public ImageDecoder { |
41 WTF_MAKE_NONCOPYABLE(GIFImageDecoder); | 41 WTF_MAKE_NONCOPYABLE(GIFImageDecoder); |
42 public: | 42 public: |
43 GIFImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileO
ption, size_t maxDecodedBytes); | 43 GIFImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileO
ption, size_t maxDecodedBytes); |
44 virtual ~GIFImageDecoder(); | 44 virtual ~GIFImageDecoder(); |
45 | 45 |
46 enum GIFParseQuery { GIFSizeQuery, GIFFrameCountQuery }; | 46 enum GIFParseQuery { GIFSizeQuery, GIFFrameCountQuery }; |
47 | 47 |
48 // ImageDecoder | 48 // ImageDecoder |
49 virtual String filenameExtension() const OVERRIDE { return "gif"; } | 49 virtual String filenameExtension() const override { return "gif"; } |
50 virtual void setData(SharedBuffer* data, bool allDataReceived) OVERRIDE; | 50 virtual void setData(SharedBuffer* data, bool allDataReceived) override; |
51 virtual bool isSizeAvailable() OVERRIDE; | 51 virtual bool isSizeAvailable() override; |
52 virtual size_t frameCount() OVERRIDE; | 52 virtual size_t frameCount() override; |
53 virtual int repetitionCount() const OVERRIDE; | 53 virtual int repetitionCount() const override; |
54 virtual ImageFrame* frameBufferAtIndex(size_t) OVERRIDE; | 54 virtual ImageFrame* frameBufferAtIndex(size_t) override; |
55 virtual bool frameIsCompleteAtIndex(size_t) const OVERRIDE; | 55 virtual bool frameIsCompleteAtIndex(size_t) const override; |
56 virtual float frameDurationAtIndex(size_t) const OVERRIDE; | 56 virtual float frameDurationAtIndex(size_t) const override; |
57 virtual size_t clearCacheExceptFrame(size_t) OVERRIDE; | 57 virtual size_t clearCacheExceptFrame(size_t) override; |
58 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid | 58 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid |
59 // accessing deleted memory, especially when calling this from inside | 59 // accessing deleted memory, especially when calling this from inside |
60 // GIFImageReader! | 60 // GIFImageReader! |
61 virtual bool setFailed() OVERRIDE; | 61 virtual bool setFailed() override; |
62 | 62 |
63 // Callbacks from the GIF reader. | 63 // Callbacks from the GIF reader. |
64 bool haveDecodedRow(size_t frameIndex, GIFRow::const_iterator rowBegin, size
_t width, size_t rowNumber, unsigned repeatCount, bool writeTransparentPixels); | 64 bool haveDecodedRow(size_t frameIndex, GIFRow::const_iterator rowBegin, size
_t width, size_t rowNumber, unsigned repeatCount, bool writeTransparentPixels); |
65 bool frameComplete(size_t frameIndex); | 65 bool frameComplete(size_t frameIndex); |
66 | 66 |
67 // For testing. | 67 // For testing. |
68 bool parseCompleted() const; | 68 bool parseCompleted() const; |
69 | 69 |
70 private: | 70 private: |
71 virtual void clearFrameBuffer(size_t frameIndex) OVERRIDE; | 71 virtual void clearFrameBuffer(size_t frameIndex) override; |
72 | 72 |
73 // Parses as much as is needed to answer the query, ignoring bitmap | 73 // Parses as much as is needed to answer the query, ignoring bitmap |
74 // data. If parsing fails, sets the "decode failure" flag. | 74 // data. If parsing fails, sets the "decode failure" flag. |
75 void parse(GIFParseQuery); | 75 void parse(GIFParseQuery); |
76 | 76 |
77 // Decodes bitmap data of the frame. Depending on the disposal method | 77 // Decodes bitmap data of the frame. Depending on the disposal method |
78 // of prior frames, also decodes all required prior frames. If decoding | 78 // of prior frames, also decodes all required prior frames. If decoding |
79 // fails, sets the "decode failure" flag. | 79 // fails, sets the "decode failure" flag. |
80 void decode(size_t frameIndex); | 80 void decode(size_t frameIndex); |
81 | 81 |
82 // Called to initialize the frame buffer with the given index, based on | 82 // Called to initialize the frame buffer with the given index, based on |
83 // the previous frame's disposal method. Returns true on success. On | 83 // the previous frame's disposal method. Returns true on success. On |
84 // failure, this will mark the image as failed. | 84 // failure, this will mark the image as failed. |
85 bool initFrameBuffer(size_t frameIndex); | 85 bool initFrameBuffer(size_t frameIndex); |
86 | 86 |
87 bool m_currentBufferSawAlpha; | 87 bool m_currentBufferSawAlpha; |
88 mutable int m_repetitionCount; | 88 mutable int m_repetitionCount; |
89 OwnPtr<GIFImageReader> m_reader; | 89 OwnPtr<GIFImageReader> m_reader; |
90 }; | 90 }; |
91 | 91 |
92 } // namespace blink | 92 } // namespace blink |
93 | 93 |
94 #endif | 94 #endif |
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