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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 "platform/image-decoders/ImageDecoder.h" | 29 #include "platform/image-decoders/ImageDecoder.h" |
| 30 #include "third_party/skia/include/codec/SkCodec.h" |
| 31 #include "third_party/skia/include/core/SkStream.h" |
30 #include "wtf/Noncopyable.h" | 32 #include "wtf/Noncopyable.h" |
| 33 #include "wtf/RefPtr.h" |
| 34 #include <algorithm> |
31 #include <memory> | 35 #include <memory> |
32 | 36 |
33 class GIFImageReader; | |
34 | |
35 typedef Vector<unsigned char> GIFRow; | |
36 | |
37 namespace blink { | 37 namespace blink { |
38 | 38 |
39 // This class decodes the GIF image format. | 39 // This class decodes the GIF image format. |
40 class PLATFORM_EXPORT GIFImageDecoder final : public ImageDecoder { | 40 class PLATFORM_EXPORT GIFImageDecoder final : public ImageDecoder { |
41 WTF_MAKE_NONCOPYABLE(GIFImageDecoder); | 41 WTF_MAKE_NONCOPYABLE(GIFImageDecoder); |
42 | 42 |
43 public: | 43 public: |
44 GIFImageDecoder(AlphaOption, const ColorBehavior&, size_t maxDecodedBytes); | 44 GIFImageDecoder(AlphaOption, const ColorBehavior&, size_t maxDecodedBytes); |
45 ~GIFImageDecoder() override; | 45 ~GIFImageDecoder() override; |
46 | 46 |
47 enum GIFParseQuery { GIFSizeQuery, GIFFrameCountQuery }; | |
48 | |
49 // ImageDecoder: | 47 // ImageDecoder: |
50 String filenameExtension() const override { return "gif"; } | 48 String filenameExtension() const override { return "gif"; } |
51 void onSetData(SegmentReader* data) override; | 49 void onSetData(SegmentReader* data) override; |
52 int repetitionCount() const override; | 50 int repetitionCount() const override; |
53 bool frameIsCompleteAtIndex(size_t) const override; | 51 bool frameIsCompleteAtIndex(size_t) const override; |
54 float frameDurationAtIndex(size_t) const override; | 52 float frameDurationAtIndex(size_t) const override; |
55 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid | |
56 // accessing deleted memory, especially when calling this from inside | |
57 // GIFImageReader! | |
58 bool setFailed() override; | |
59 | |
60 // Callbacks from the GIF reader. | |
61 bool haveDecodedRow(size_t frameIndex, | |
62 GIFRow::const_iterator rowBegin, | |
63 size_t width, | |
64 size_t rowNumber, | |
65 unsigned repeatCount, | |
66 bool writeTransparentPixels); | |
67 bool frameComplete(size_t frameIndex); | |
68 | |
69 // For testing. | |
70 bool parseCompleted() const; | |
71 | 53 |
72 private: | 54 private: |
73 // ImageDecoder: | 55 // ImageDecoder: |
74 void clearFrameBuffer(size_t frameIndex) override; | 56 void decodeSize() override {} |
75 virtual void decodeSize() { parse(GIFSizeQuery); } | |
76 size_t decodeFrameCount() override; | 57 size_t decodeFrameCount() override; |
77 void initializeNewFrame(size_t) override; | 58 void initializeNewFrame(size_t) override; |
78 void decode(size_t) override; | 59 void decode(size_t) override; |
79 | |
80 // Parses as much as is needed to answer the query, ignoring bitmap | |
81 // data. If parsing fails, sets the "decode failure" flag. | |
82 void parse(GIFParseQuery); | |
83 | |
84 // Reset the alpha tracker for this frame. Before calling this method, the | |
85 // caller must verify that the frame exists. | |
86 void onInitFrameBuffer(size_t) override; | |
87 | |
88 // When the disposal method of the frame is DisposeOverWritePrevious, the | 60 // When the disposal method of the frame is DisposeOverWritePrevious, the |
89 // next frame will use the previous frame's buffer as its starting state, so | 61 // next frame will use the previous frame's buffer as its starting state, so |
90 // we can't take over the data in that case. Before calling this method, the | 62 // we can't take over the data in that case. Before calling this method, the |
91 // caller must verify that the frame exists. | 63 // caller must verify that the frame exists. |
92 bool canReusePreviousFrameBuffer(size_t) const override; | 64 bool canReusePreviousFrameBuffer(size_t) const override; |
93 | 65 |
94 bool m_currentBufferSawAlpha; | 66 class SegmentStream : public SkStream { |
95 mutable int m_repetitionCount; | 67 public: |
96 std::unique_ptr<GIFImageReader> m_reader; | 68 SegmentStream() : m_reader(), m_position(0), m_hasReadAllContents(true) {} |
| 69 |
| 70 void setReader(SegmentReader* reader, bool allContentsReceived) { |
| 71 m_reader = reader; |
| 72 m_hasReadAllContents = reader->size() == m_position; |
| 73 } |
| 74 |
| 75 size_t read(void* dst, size_t len) { |
| 76 len = std::min(len, m_reader->size()); |
| 77 |
| 78 size_t bytesAdvanced = 0; |
| 79 if (!dst) { // skipping, not reading |
| 80 bytesAdvanced = len; |
| 81 } else { |
| 82 size_t totalBytesRead = 0; |
| 83 char* destAsCharPtr = reinterpret_cast<char*>(dst); |
| 84 while (len) { |
| 85 const char* segment = nullptr; |
| 86 size_t bytesRead = m_reader->getSomeData(segment, m_position); |
| 87 if (!bytesRead) { |
| 88 break; |
| 89 } |
| 90 if (bytesRead > len) { |
| 91 bytesRead = len; |
| 92 } |
| 93 |
| 94 memcpy(destAsCharPtr, segment, bytesRead); |
| 95 destAsCharPtr += bytesRead; |
| 96 len -= bytesRead; |
| 97 totalBytesRead += bytesRead; |
| 98 } |
| 99 |
| 100 bytesAdvanced = totalBytesRead; |
| 101 } |
| 102 |
| 103 m_position += bytesAdvanced; |
| 104 m_hasReadAllContents = m_position == m_reader->size(); |
| 105 |
| 106 return bytesAdvanced; |
| 107 } |
| 108 |
| 109 bool isAtEnd() const override { return m_hasReadAllContents; } |
| 110 |
| 111 private: |
| 112 WTF::RefPtr<SegmentReader> m_reader; |
| 113 size_t m_position; |
| 114 bool m_hasReadAllContents; |
| 115 }; |
| 116 |
| 117 std::unique_ptr<SkCodec> m_codec; |
| 118 SegmentStream* m_segmentStream; |
| 119 // m_segmentStream is a raw pointer because it passes ownership to |
| 120 // m_codec when m_codec is created. However, we still need the |
| 121 // reference so we can append more data as it arrives. |
97 }; | 122 }; |
98 | 123 |
99 } // namespace blink | 124 } // namespace blink |
100 | 125 |
101 #endif | 126 #endif |
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