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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 readOffset); | |
46 ~PNGImageReader(); | |
47 | |
48 struct FrameInfo { | |
49 size_t readOffset; | |
50 size_t byteLength; | |
51 size_t duration; | |
52 IntPoint offset; | |
scroggo_chromium
2016/10/11 20:13:11
Why not combine offset and size into an IntRect?
| |
53 IntSize size; | |
54 ImageFrame::DisposalMethod disposalMethod; | |
55 ImageFrame::AlphaBlendSource alphaBlend; | |
56 }; | |
57 | |
58 /* | |
59 * This method tries to parse the data stream in the SegmentReader, up to | |
60 * the point where the PNGParseQuery can be answered. It returns true when | |
scroggo_chromium
2016/10/11 20:13:11
I think some better formatting will make this easi
| |
61 * the query is fulfilled. It returns false when 1) there is not enough data | |
62 * provided, or 2) when the data processing by libpng fails. In the case of | |
63 * 2), it also calls setFailed() at the m_decoder. | |
scroggo_chromium
2016/10/11 20:13:11
nit: "on m_decoder"
| |
64 */ | |
65 bool parse(SegmentReader&, PNGImageDecoder::PNGParseQuery); | |
66 | |
67 void decode(SegmentReader&, size_t); | |
68 const FrameInfo& frameInfo(size_t) const; | |
69 | |
70 /* | |
71 * This will return the number of frames that have been detected in the | |
72 * stream so far. If an incomplete stream is provided, this number is not | |
73 * final. However, all frame info for the frames up to this number is | |
74 * available so it can be used by the client if it wants to. | |
75 */ | |
76 size_t frameCount() const; | |
77 | |
78 // This is a callback for libpng, when it encounters an unknown chunk. | |
79 void parseAnimationChunk(const char* tag, const void* dataChunk, size_t leng th); | |
80 | |
81 png_structp pngPtr() const { return m_png; } | |
82 png_infop infoPtr() const { return m_info; } | |
83 | |
84 size_t getReadOffset() const { return m_readOffset; } | |
85 void setReadOffset(size_t offset) { m_readOffset = offset; } | |
86 void setHasAlpha(bool hasAlpha) { m_hasAlpha = hasAlpha; } | |
87 bool hasAlpha() const { return m_hasAlpha; } | |
88 | |
89 png_bytep interlaceBuffer() const { return m_interlaceBuffer.get(); } | |
90 void createInterlaceBuffer(int size) { m_interlaceBuffer = wrapArrayUnique(n ew png_byte[size]); } | |
91 #if USE(QCMSLIB) | |
92 png_bytep rowBuffer() const { return m_rowBuffer.get(); } | |
93 void createRowBuffer(int size) { m_rowBuffer = wrapArrayUnique(new png_byte[ size]); } | |
94 #endif | |
95 | |
96 | |
97 private: | |
98 png_structp m_png; | |
99 png_infop m_info; | |
100 PNGImageDecoder* m_decoder; | |
101 size_t m_readOffset; | |
102 bool m_hasAlpha; | |
103 bool m_idatPartOfAnimation; | |
scroggo_chromium
2016/10/11 20:13:11
nit: I think this is more clear if you insert the
| |
104 bool m_parsedSignature; | |
105 std::unique_ptr<png_byte[]> m_interlaceBuffer; | |
106 | |
107 Vector<FrameInfo, 1> m_frameInfo; | |
108 FrameInfo m_newFrame; | |
109 | |
110 // Before using this method, see the remarks at the definition. | |
111 png_byte* readAsPngBytep(const FastSharedBufferReader&, size_t offset, size_ t length); | |
112 char m_readBuffer[26]; | |
113 | |
114 bool processData(SegmentReader&, size_t offset, size_t length); | |
115 bool parseSize(SegmentReader&); | |
116 void parseAnimationControl(const png_byte* data); | |
117 void parseFrameInfo(const png_byte* data); | |
118 | |
119 #if USE(QCMSLIB) | |
120 std::unique_ptr<png_byte[]> m_rowBuffer; | |
121 #endif | |
122 }; | |
123 | |
124 }; | |
125 | |
126 #endif | |
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