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Side by Side Diff: Source/core/platform/image-decoders/gif/GIFImageDecoder.h

Issue 15350006: Decode GIF image frames on demand. (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master
Patch Set: Created 7 years, 7 months ago
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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
11 * documentation and/or other materials provided with the distribution. 11 * documentation and/or other materials provided with the distribution.
12 * 12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */ 24 */
25 25
26 #ifndef GIFImageDecoder_h 26 #ifndef GIFImageDecoder_h
27 #define GIFImageDecoder_h 27 #define GIFImageDecoder_h
28 28
29 #include "core/platform/image-decoders/ImageDecoder.h" 29 #include "core/platform/image-decoders/ImageDecoder.h"
30 #include <wtf/OwnPtr.h> 30 #include "wtf/OwnPtr.h"
31 31
32 class GIFImageReader; 32 class GIFImageReader;
33 33
34 namespace WebCore { 34 namespace WebCore {
35 35
36 // This class decodes the GIF image format. 36 // This class decodes the GIF image format.
37 class GIFImageDecoder : public ImageDecoder { 37 class GIFImageDecoder : public ImageDecoder {
38 public: 38 public:
39 GIFImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProf ileOption); 39 GIFImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProf ileOption);
40 virtual ~GIFImageDecoder(); 40 virtual ~GIFImageDecoder();
41 41
42 enum GIFQuery { GIFFullQuery, GIFSizeQuery, GIFFrameCountQuery }; 42 enum GIFParseQuery { 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; 52 virtual bool frameIsCompleteAtIndex(size_t) const;
53 virtual float frameDurationAtIndex(size_t) const; 53 virtual float frameDurationAtIndex(size_t) const;
54 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid 54 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid
55 // accessing deleted memory, especially when calling this from inside 55 // accessing deleted memory, especially when calling this from inside
56 // GIFImageReader! 56 // GIFImageReader!
57 virtual bool setFailed(); 57 virtual bool setFailed();
58 virtual void clearFrameBufferCache(size_t clearBeforeFrame);
59 58
60 // Callbacks from the GIF reader. 59 // Callbacks from the GIF reader.
61 bool haveDecodedRow(unsigned frameIndex, const Vector<unsigned char>& ro wBuffer, size_t width, size_t rowNumber, unsigned repeatCount, bool writeTranspa rentPixels); 60 bool haveDecodedRow(size_t frameIndex, const Vector<unsigned char>& rowB uffer, size_t width, size_t rowNumber, unsigned repeatCount, bool writeTranspare ntPixels);
62 bool frameComplete(unsigned frameIndex, unsigned frameDuration, ImageFra me::FrameDisposalMethod disposalMethod); 61 bool frameComplete(size_t frameIndex);
63 void gifComplete(); 62
63 // For testing.
64 bool parseCompleted() const;
64 65
65 private: 66 private:
66 // If the query is GIFFullQuery, decodes the image up to (but not 67 virtual void clearFrameBuffer(size_t frameIndex) OVERRIDE;
67 // including) |haltAtFrame|. Otherwise, decodes as much as is needed to 68
68 // answer the query, ignoring bitmap data. If decoding fails but there 69 // Parses as much as is needed to answer the query, ignoring bitmap
69 // is no more data coming, sets the "decode failure" flag. 70 // data. If parsing fails, sets the "decode failure" flag.
70 void decode(unsigned haltAtFrame, GIFQuery); 71 void parse(GIFParseQuery);
72
73 // Decodes bitmap data of the frame. Depending on the disposal method
74 // of prior frames, also decodes all required prior frames. If decoding
75 // fails, sets the "decode failure" flag.
76 void decode(size_t frameIndex);
71 77
72 // Called to initialize the frame buffer with the given index, based on 78 // Called to initialize the frame buffer with the given index, based on
73 // the previous frame's disposal method. Returns true on success. On 79 // the previous frame's disposal method. Returns true on success. On
74 // failure, this will mark the image as failed. 80 // failure, this will mark the image as failed.
75 bool initFrameBuffer(unsigned frameIndex); 81 bool initFrameBuffer(size_t frameIndex);
76 82
77 bool m_currentBufferSawAlpha; 83 bool m_currentBufferSawAlpha;
78 mutable int m_repetitionCount; 84 mutable int m_repetitionCount;
79 OwnPtr<GIFImageReader> m_reader; 85 OwnPtr<GIFImageReader> m_reader;
80 }; 86 };
81 87
82 } // namespace WebCore 88 } // namespace WebCore
83 89
84 #endif 90 #endif
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