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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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42 enum GIFQuery { GIFFullQuery, GIFSizeQuery, GIFFrameCountQuery }; | 42 enum GIFQuery { GIFFullQuery, GIFSizeQuery, GIFFrameCountQuery }; |
43 | 43 |
44 // ImageDecoder | 44 // ImageDecoder |
45 virtual String filenameExtension() const { return "gif"; } | 45 virtual String filenameExtension() const { return "gif"; } |
46 virtual void setData(SharedBuffer* data, bool allDataReceived); | 46 virtual void setData(SharedBuffer* data, bool allDataReceived); |
47 virtual bool isSizeAvailable(); | 47 virtual bool isSizeAvailable(); |
48 virtual bool setSize(unsigned width, unsigned height); | 48 virtual bool setSize(unsigned width, unsigned height); |
49 virtual size_t frameCount(); | 49 virtual size_t frameCount(); |
50 virtual int repetitionCount() const; | 50 virtual int repetitionCount() const; |
51 virtual ImageFrame* frameBufferAtIndex(size_t index); | 51 virtual ImageFrame* frameBufferAtIndex(size_t index); |
| 52 virtual bool frameIsCompleteAtIndex(size_t) const; |
| 53 virtual float frameDurationAtIndex(size_t) const; |
52 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid | 54 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid |
53 // accessing deleted memory, especially when calling this from inside | 55 // accessing deleted memory, especially when calling this from inside |
54 // GIFImageReader! | 56 // GIFImageReader! |
55 virtual bool setFailed(); | 57 virtual bool setFailed(); |
56 virtual void clearFrameBufferCache(size_t clearBeforeFrame); | 58 virtual void clearFrameBufferCache(size_t clearBeforeFrame); |
57 | 59 |
58 // Callbacks from the GIF reader. | 60 // Callbacks from the GIF reader. |
59 bool haveDecodedRow(unsigned frameIndex, const Vector<unsigned char>& ro
wBuffer, size_t width, size_t rowNumber, unsigned repeatCount, bool writeTranspa
rentPixels); | 61 bool haveDecodedRow(unsigned frameIndex, const Vector<unsigned char>& ro
wBuffer, size_t width, size_t rowNumber, unsigned repeatCount, bool writeTranspa
rentPixels); |
60 bool frameComplete(unsigned frameIndex, unsigned frameDuration, ImageFra
me::FrameDisposalMethod disposalMethod); | 62 bool frameComplete(unsigned frameIndex, unsigned frameDuration, ImageFra
me::FrameDisposalMethod disposalMethod); |
61 void gifComplete(); | 63 void gifComplete(); |
62 | 64 |
63 private: | 65 private: |
64 // If the query is GIFFullQuery, decodes the image up to (but not | 66 // If the query is GIFFullQuery, decodes the image up to (but not |
65 // including) |haltAtFrame|. Otherwise, decodes as much as is needed to | 67 // including) |haltAtFrame|. Otherwise, decodes as much as is needed to |
66 // answer the query, ignoring bitmap data. If decoding fails but there | 68 // answer the query, ignoring bitmap data. If decoding fails but there |
67 // is no more data coming, sets the "decode failure" flag. | 69 // is no more data coming, sets the "decode failure" flag. |
68 void decode(unsigned haltAtFrame, GIFQuery); | 70 void decode(unsigned haltAtFrame, GIFQuery); |
69 | 71 |
70 // Called to initialize the frame buffer with the given index, based on | 72 // Called to initialize the frame buffer with the given index, based on |
71 // the previous frame's disposal method. Returns true on success. On | 73 // the previous frame's disposal method. Returns true on success. On |
72 // failure, this will mark the image as failed. | 74 // failure, this will mark the image as failed. |
73 bool initFrameBuffer(unsigned frameIndex); | 75 bool initFrameBuffer(unsigned frameIndex); |
74 | 76 |
| 77 // Return true only if the file is known to be truncated. |
| 78 bool truncated() const; |
| 79 |
75 bool m_currentBufferSawAlpha; | 80 bool m_currentBufferSawAlpha; |
76 mutable int m_repetitionCount; | 81 mutable int m_repetitionCount; |
77 OwnPtr<GIFImageReader> m_reader; | 82 OwnPtr<GIFImageReader> m_reader; |
78 }; | 83 }; |
79 | 84 |
80 } // namespace WebCore | 85 } // namespace WebCore |
81 | 86 |
82 #endif | 87 #endif |
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