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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, | 44 GIFImageDecoder(AlphaOption, |
45 ColorSpaceOption, | 45 ColorSpaceOption, |
46 sk_sp<SkColorSpace>, | 46 sk_sp<SkColorSpace>, |
47 size_t maxDecodedBytes); | 47 size_t maxDecodedBytes); |
48 ~GIFImageDecoder() override; | 48 ~GIFImageDecoder() override; |
49 | 49 |
50 enum GIFParseQuery { GIFSizeQuery, GIFFrameCountQuery }; | |
51 | |
52 // ImageDecoder: | 50 // ImageDecoder: |
53 String filenameExtension() const override { return "gif"; } | 51 String filenameExtension() const override { return "gif"; } |
54 void onSetData(SegmentReader* data) override; | 52 void onSetData(SegmentReader* data) override; |
55 int repetitionCount() const override; | 53 int repetitionCount() const override; |
56 bool frameIsCompleteAtIndex(size_t) const override; | 54 bool frameIsCompleteAtIndex(size_t) const override; |
57 float frameDurationAtIndex(size_t) const override; | 55 float frameDurationAtIndex(size_t) const override; |
58 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid | |
59 // accessing deleted memory, especially when calling this from inside | |
60 // GIFImageReader! | |
61 bool setFailed() override; | |
62 | |
63 // Callbacks from the GIF reader. | |
64 bool haveDecodedRow(size_t frameIndex, | |
65 GIFRow::const_iterator rowBegin, | |
66 size_t width, | |
67 size_t rowNumber, | |
68 unsigned repeatCount, | |
69 bool writeTransparentPixels); | |
70 bool frameComplete(size_t frameIndex); | |
71 | |
72 // For testing. | |
73 bool parseCompleted() const; | |
74 | 56 |
75 private: | 57 private: |
76 // ImageDecoder: | 58 // ImageDecoder: |
77 void clearFrameBuffer(size_t frameIndex) override; | 59 void decodeSize() override; |
78 virtual void decodeSize() { parse(GIFSizeQuery); } | |
79 size_t decodeFrameCount() override; | 60 size_t decodeFrameCount() override; |
80 void initializeNewFrame(size_t) override; | 61 void initializeNewFrame(size_t) override; |
81 void decode(size_t) override; | 62 void decode(size_t) override; |
82 | 63 |
83 // Parses as much as is needed to answer the query, ignoring bitmap | |
84 // data. If parsing fails, sets the "decode failure" flag. | |
85 void parse(GIFParseQuery); | |
86 | |
87 // Reset the alpha tracker for this frame. Before calling this method, the | |
88 // caller must verify that the frame exists. | |
89 void onInitFrameBuffer(size_t) override; | |
90 | |
91 // When the disposal method of the frame is DisposeOverWritePrevious, the | 64 // When the disposal method of the frame is DisposeOverWritePrevious, the |
92 // 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 |
93 // 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 |
94 // caller must verify that the frame exists. | 67 // caller must verify that the frame exists. |
95 bool canReusePreviousFrameBuffer(size_t) const override; | 68 bool canReusePreviousFrameBuffer(size_t) const override; |
96 | 69 |
97 bool m_currentBufferSawAlpha; | 70 class SegmentStream : public SkStream { |
98 mutable int m_repetitionCount; | 71 public: |
99 std::unique_ptr<GIFImageReader> m_reader; | 72 SegmentStream() |
73 : m_reader(), | |
74 m_position(0), | |
75 m_hasReadAllContents(true) {} | |
76 | |
77 void setReader(SegmentReader* reader, bool allContentsReceived) { | |
78 m_reader = reader; | |
79 m_position = 0; | |
scroggo_chromium
2016/12/14 17:49:23
Why does this reset the position? You'll be receiv
cblume
2016/12/16 02:57:10
Yeah, that was a mistake. I removed it.
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80 m_hasReadAllContents = false; | |
scroggo_chromium
2016/12/14 17:49:23
This assumes you will never be given a SegmentRead
cblume
2016/12/16 02:57:10
We might be thinking of different things. Perhaps
scroggo_chromium
2016/12/16 15:03:48
Yes, but that would be determined by m_position, w
cblume
2016/12/16 17:43:41
Done.
| |
81 } | |
82 | |
83 size_t read(void* dst, size_t len) { | |
84 len = std::min(len, m_reader->size()); | |
85 | |
86 size_t bytesAdvanced = 0; | |
87 if (!dst) { // skipping, not reading | |
88 bytesAdvanced = len; | |
89 } else { | |
90 size_t totalBytesRead = 0; | |
91 intptr_t destAsInt = reinterpret_cast<intptr_t>(dst); | |
scroggo_chromium
2016/12/14 17:49:23
I haven't seen this pattern before, and do not see
cblume
2016/12/16 02:57:10
Hrmmm you are right, it is optional.
We had used t
| |
92 while (len) { | |
93 const char* segment = nullptr; | |
94 size_t bytesRead = m_reader->getSomeData(segment, len); | |
scroggo_chromium
2016/12/14 17:49:23
This came up while I was reviewing the first patch
cblume
2016/12/16 02:57:10
Done.
| |
95 if (!bytesRead) { | |
96 break; | |
97 } | |
98 | |
99 memcpy(reinterpret_cast<void*>(destAsInt), segment, bytesRead); | |
100 destAsInt += bytesRead; | |
101 len -= bytesRead; | |
102 totalBytesRead += bytesRead; | |
103 } | |
104 | |
105 bytesAdvanced = totalBytesRead; | |
106 } | |
107 | |
108 m_position += bytesAdvanced; | |
109 m_hasReadAllContents = m_position == m_reader->size(); | |
110 | |
111 return bytesAdvanced; | |
112 } | |
113 | |
114 bool isAtEnd() const override { return m_hasReadAllContents; } | |
115 | |
116 private: | |
117 WTF::RefPtr<SegmentReader> m_reader; | |
118 size_t m_position; | |
119 bool m_hasReadAllContents; | |
120 }; | |
121 | |
122 std::unique_ptr<SkCodec> m_codec; | |
123 SegmentStream* m_segmentStream; | |
124 // m_segmentStream is a raw pointer because it passes ownership to | |
125 // m_codec when m_codec is created. However, we still need the | |
126 // reference so we can append more data as it arrives. | |
100 }; | 127 }; |
101 | 128 |
102 } // namespace blink | 129 } // namespace blink |
103 | 130 |
104 #endif | 131 #endif |
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