Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(329)

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, 6 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View unified diff | Download patch
OLDNEW
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 size_t frameCount(); 48 virtual size_t frameCount();
49 virtual int repetitionCount() const; 49 virtual int repetitionCount() const;
50 virtual ImageFrame* frameBufferAtIndex(size_t); 50 virtual ImageFrame* frameBufferAtIndex(size_t);
51 virtual bool frameIsCompleteAtIndex(size_t) const; 51 virtual bool frameIsCompleteAtIndex(size_t) const;
52 virtual float frameDurationAtIndex(size_t) const; 52 virtual float frameDurationAtIndex(size_t) const;
53 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid 53 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid
54 // accessing deleted memory, especially when calling this from inside 54 // accessing deleted memory, especially when calling this from inside
55 // GIFImageReader! 55 // GIFImageReader!
56 virtual bool setFailed(); 56 virtual bool setFailed();
57 virtual void clearFrameBufferCache(size_t clearBeforeFrame);
58 57
59 // Callbacks from the GIF reader. 58 // Callbacks from the GIF reader.
60 bool haveDecodedRow(unsigned frameIndex, const Vector<unsigned char>& ro wBuffer, size_t width, size_t rowNumber, unsigned repeatCount, bool writeTranspa rentPixels); 59 bool haveDecodedRow(size_t frameIndex, const Vector<unsigned char>& rowB uffer, size_t width, size_t rowNumber, unsigned repeatCount, bool writeTranspare ntPixels);
61 bool frameComplete(unsigned frameIndex, unsigned frameDuration, ImageFra me::FrameDisposalMethod disposalMethod); 60 bool frameComplete(size_t frameIndex);
62 void gifComplete(); 61
62 // For testing.
63 bool parseCompleted() const;
63 64
64 private: 65 private:
65 // If the query is GIFFullQuery, decodes the image up to (but not 66 virtual void clearFrameBuffer(size_t frameIndex) OVERRIDE;
66 // including) |haltAtFrame|. Otherwise, decodes as much as is needed to 67
67 // answer the query, ignoring bitmap data. If decoding fails but there 68 // Parses as much as is needed to answer the query, ignoring bitmap
68 // is no more data coming, sets the "decode failure" flag. 69 // data. If parsing fails, sets the "decode failure" flag.
69 void decode(unsigned haltAtFrame, GIFQuery); 70 void parse(GIFParseQuery);
71
72 // Decodes bitmap data of the frame. Depending on the disposal method
73 // of prior frames, also decodes all required prior frames. If decoding
74 // fails, sets the "decode failure" flag.
75 void decode(size_t frameIndex);
70 76
71 // Called to initialize the frame buffer with the given index, based on 77 // Called to initialize the frame buffer with the given index, based on
72 // the previous frame's disposal method. Returns true on success. On 78 // the previous frame's disposal method. Returns true on success. On
73 // failure, this will mark the image as failed. 79 // failure, this will mark the image as failed.
74 bool initFrameBuffer(unsigned frameIndex); 80 bool initFrameBuffer(size_t frameIndex);
75 81
76 bool m_currentBufferSawAlpha; 82 bool m_currentBufferSawAlpha;
77 mutable int m_repetitionCount; 83 mutable int m_repetitionCount;
78 OwnPtr<GIFImageReader> m_reader; 84 OwnPtr<GIFImageReader> m_reader;
79 }; 85 };
80 86
81 } // namespace WebCore 87 } // namespace WebCore
82 88
83 #endif 89 #endif
OLDNEW

Powered by Google App Engine
This is Rietveld 408576698