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1 /* | |
2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. | |
3 * | |
4 * Redistribution and use in source and binary forms, with or without | |
5 * modification, are permitted provided that the following conditions | |
6 * are met: | |
7 * 1. Redistributions of source code must retain the above copyright | |
8 * notice, this list of conditions and the following disclaimer. | |
9 * 2. Redistributions in binary form must reproduce the above copyright | |
10 * notice, this list of conditions and the following disclaimer in the | |
11 * documentation and/or other materials provided with the distribution. | |
12 * | |
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY | |
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
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. | |
24 */ | |
25 | |
26 | |
27 #include "platform/image-decoders/SegmentReader.h" | |
28 #include "platform/image-decoders/png/PNGImageDecoder.h" | |
29 #include "platform/PlatformExport.h" | |
30 #include "png.h" | |
31 #include "wtf/Allocator.h" | |
32 #include "wtf/PtrUtil.h" | |
33 | |
34 #ifndef PNGImageReader_h | |
35 #define PNGImageReader_h | |
36 | |
37 namespace blink { | |
38 | |
39 class FastSharedBufferReader; | |
40 | |
41 class PLATFORM_EXPORT PNGImageReader final { | |
42 USING_FAST_MALLOC(PNGImageReader); | |
43 WTF_MAKE_NONCOPYABLE(PNGImageReader); | |
44 public: | |
45 PNGImageReader(PNGImageDecoder*, size_t initialOffset); | |
46 ~PNGImageReader(); | |
47 | |
48 struct FrameInfo { | |
49 size_t readOffset; | |
50 size_t byteLength; | |
51 size_t duration; | |
52 IntRect frameRect; | |
53 uint8_t disposalMethod; | |
54 uint8_t alphaBlend; | |
55 }; | |
56 | |
57 | |
58 // This method tries to parse the data stream in the SegmentReader, up to | |
59 // the point where the PNGParseQuery can be answered. | |
60 // @return true when the query is fulfilled. | |
61 // false when: | |
62 // A) not enough data provided | |
63 // B) the data processing by libpng fails. In this case, it also | |
64 // calls setFailed() on m_decoder. | |
65 bool parse(SegmentReader&, PNGImageDecoder::PNGParseQuery); | |
66 | |
67 void decode(SegmentReader&, size_t); | |
68 const FrameInfo& frameInfo(size_t) const; | |
69 | |
70 // This will return the number of frames that have been detected in the | |
71 // stream so far. If an incomplete stream is provided, this number is not | |
72 // final. However, all frame info for the frames up to this number is | |
73 // available so it can be used by the client if it wants to. | |
74 size_t frameCount() const; | |
75 | |
76 // This is a callback for libpng, when it encounters an unknown chunk. | |
77 void parseAnimationChunk(const char* tag, const void* dataChunk, size_t leng th); | |
78 | |
79 png_structp pngPtr() const { return m_png; } | |
80 png_infop infoPtr() const { return m_info; } | |
81 | |
82 void setHasAlpha(bool hasAlpha) { m_hasAlpha = hasAlpha; } | |
83 bool hasAlpha() const { return m_hasAlpha; } | |
84 | |
85 png_bytep interlaceBuffer() const { return m_interlaceBuffer.get(); } | |
86 void createInterlaceBuffer(int size) { m_interlaceBuffer = wrapArrayUnique(n ew png_byte[size]); } | |
87 #if USE(QCMSLIB) | |
88 png_bytep rowBuffer() const { return m_rowBuffer.get(); } | |
89 void createRowBuffer(int size) { m_rowBuffer = wrapArrayUnique(new png_byte[ size]); } | |
90 #endif | |
91 | |
92 | |
93 private: | |
94 png_structp m_png; | |
95 png_infop m_info; | |
96 PNGImageDecoder* m_decoder; | |
97 const size_t m_initialOffset; | |
98 size_t m_readOffset; | |
99 // The number of bytes that contain the PNG info data. That is, this is the | |
100 // length from the start of the data to the IDAT chunk. | |
101 size_t m_bytesInfo; | |
scroggo_chromium
2016/10/26 18:25:58
How about m_idatOffset? m_bytesInfo doesn't mean a
| |
102 bool m_hasAlpha; | |
103 // This flag is set to true when an fcTL chunk is encountered before the | |
104 // IDAT chunk(s). In that case, the IDAT data is the first frame. Otherwise, | |
105 // the IDAT is ignored. | |
106 bool m_idatIsPartOfAnimation; | |
107 bool m_isAnimated; | |
108 bool m_parsedSignature; | |
109 | |
110 std::unique_ptr<png_byte[]> m_interlaceBuffer; | |
111 | |
112 Vector<FrameInfo, 1> m_frameInfo; | |
113 FrameInfo m_newFrame; | |
114 | |
115 size_t processData(SegmentReader&, size_t offset, size_t length); | |
116 bool parseSize(SegmentReader&); | |
117 void parseFrameInfo(const png_byte* data); | |
118 void startFrameDecoding(SegmentReader&, size_t); | |
119 void endFrameDecoding(); | |
120 | |
121 #if USE(QCMSLIB) | |
122 std::unique_ptr<png_byte[]> m_rowBuffer; | |
123 #endif | |
124 }; | |
125 | |
126 }; | |
127 | |
128 #endif | |
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