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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 <algorithm> | |
30 #include <memory> | |
29 #include "platform/image-decoders/ImageDecoder.h" | 31 #include "platform/image-decoders/ImageDecoder.h" |
32 #include "third_party/skia/include/codec/SkCodec.h" | |
33 #include "third_party/skia/include/core/SkStream.h" | |
30 #include "wtf/Noncopyable.h" | 34 #include "wtf/Noncopyable.h" |
31 #include <memory> | 35 #include "wtf/RefPtr.h" |
32 | |
33 class GIFImageReader; | |
34 | |
35 typedef Vector<unsigned char> GIFRow; | |
36 | 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 index) override; |
78 void decode(size_t) override; | 59 void decode(size_t) override; |
79 | 60 bool frameStatusSufficientForSuccessors(size_t index) { |
80 // Parses as much as is needed to answer the query, ignoring bitmap | 61 DCHECK(index < m_frameBufferCache.size()); |
81 // data. If parsing fails, sets the "decode failure" flag. | 62 return m_frameBufferCache[index].getStatus() == ImageFrame::FrameComplete; |
82 void parse(GIFParseQuery); | 63 } |
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 | 64 // 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 | 65 // 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 | 66 // we can't take over the data in that case. Before calling this method, the |
91 // caller must verify that the frame exists. | 67 // caller must verify that the frame exists. |
92 bool canReusePreviousFrameBuffer(size_t) const override; | 68 bool canReusePreviousFrameBuffer(size_t) const override; |
93 | 69 |
94 bool m_currentBufferSawAlpha; | 70 class SegmentStream : public SkStream { |
95 mutable int m_repetitionCount; | 71 public: |
96 std::unique_ptr<GIFImageReader> m_reader; | 72 SegmentStream() : m_reader(), m_position(0), m_hasReadAllContents(true) {} |
73 | |
74 void setReader(SegmentReader* reader, bool allContentsReceived) { | |
75 m_reader = reader; | |
76 if (reader) | |
77 m_hasReadAllContents = reader->size() == m_position; | |
cblume
2017/03/07 09:00:11
I need some help here.
With just this, I get this
scroggo_chromium
2017/03/07 21:35:08
I don't think I have enough context here. If there
cblume
2017/03/08 11:36:11
That is a very good question.
I'll look into this
| |
78 } | |
79 | |
80 size_t read(void* dst, size_t len) { | |
81 len = std::min(len, m_reader->size() - m_position); | |
82 | |
83 size_t bytesAdvanced = 0; | |
84 if (!dst) { // skipping, not reading | |
85 bytesAdvanced = len; | |
86 } else { | |
87 bytesAdvanced = peek(dst, len); | |
88 } | |
89 | |
90 m_position += bytesAdvanced; | |
91 m_hasReadAllContents = m_position == m_reader->size(); | |
92 | |
93 return bytesAdvanced; | |
94 } | |
95 | |
96 size_t peek(void* buffer, size_t size) const override { | |
97 size = std::min(size, m_reader->size() - m_position); | |
98 | |
99 size_t peekPosition = m_position; | |
100 size_t totalBytesPeeked = 0; | |
101 char* bufferAsCharPtr = reinterpret_cast<char*>(buffer); | |
102 while (size) { | |
103 const char* segment = nullptr; | |
104 size_t bytesPeeked = m_reader->getSomeData(segment, peekPosition); | |
105 if (!bytesPeeked) { | |
106 break; | |
107 } | |
108 if (bytesPeeked > size) { | |
109 bytesPeeked = size; | |
110 } | |
111 | |
112 memcpy(bufferAsCharPtr, segment, bytesPeeked); | |
113 bufferAsCharPtr += bytesPeeked; | |
114 size -= bytesPeeked; | |
115 totalBytesPeeked += bytesPeeked; | |
116 peekPosition += bytesPeeked; | |
117 } | |
118 | |
119 return totalBytesPeeked; | |
120 } | |
121 | |
122 bool isAtEnd() const override { return m_hasReadAllContents; } | |
123 | |
124 bool rewind() override { | |
125 m_position = 0; | |
126 return true; | |
127 } | |
128 | |
129 bool hasPosition() const override { return true; } | |
130 size_t getPosition() const override { return m_position; } | |
131 | |
132 bool seek(size_t position) override { | |
133 position = std::min(position, m_reader->size()); | |
134 m_position = position; | |
135 | |
136 return true; | |
137 } | |
138 | |
139 bool move(long offset) override { | |
140 long absolutePosition = m_position + offset; | |
141 | |
142 // clamp inside the bounds of the buffer size | |
143 absolutePosition = std::max(absolutePosition, 0l); | |
144 absolutePosition = | |
145 std::min(static_cast<size_t>(absolutePosition), m_reader->size()); | |
146 | |
147 m_position = absolutePosition; | |
148 m_hasReadAllContents = m_position == m_reader->size(); | |
149 | |
150 return true; | |
151 } | |
152 | |
153 bool hasLength() const override { return true; } | |
154 size_t getLength() const override { return m_reader->size(); } | |
155 | |
156 private: | |
157 WTF::RefPtr<SegmentReader> m_reader; | |
158 size_t m_position; | |
159 bool m_hasReadAllContents; | |
160 }; | |
161 | |
162 std::unique_ptr<SkCodec> m_codec; | |
163 // m_segmentStream is a raw pointer because it passes ownership to | |
164 // m_codec when m_codec is created. However, we still need the | |
165 // pointer so we can append more data as it arrives. | |
166 SegmentStream* m_segmentStream; | |
97 }; | 167 }; |
98 | 168 |
99 } // namespace blink | 169 } // namespace blink |
100 | 170 |
101 #endif | 171 #endif |
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