1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
* Copyright (C) 2006 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PNGImageDecoder_h
#define PNGImageDecoder_h
#include "ImageDecoder.h"
#if ENABLE(APNG)
#include <png.h>
#endif
namespace WebCore {
class PNGImageReader;
// This class decodes the PNG image format.
class PNGImageDecoder : public ImageDecoder {
public:
PNGImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption);
virtual ~PNGImageDecoder();
// ImageDecoder
virtual String filenameExtension() const override { return "png"; }
#if ENABLE(APNG)
virtual size_t frameCount() override { return m_frameCount; }
virtual int repetitionCount() const override { return m_playCount-1; }
#endif
virtual bool isSizeAvailable() override;
virtual bool setSize(unsigned width, unsigned height) override;
virtual ImageFrame* frameBufferAtIndex(size_t index) override;
// CAUTION: setFailed() deletes |m_reader|. Be careful to avoid
// accessing deleted memory, especially when calling this from inside
// PNGImageReader!
virtual bool setFailed() override;
// Callbacks from libpng
void headerAvailable();
void rowAvailable(unsigned char* rowBuffer, unsigned rowIndex, int interlacePass);
void pngComplete();
#if ENABLE(APNG)
void readChunks(png_unknown_chunkp);
void frameHeader();
void init();
virtual void clearFrameBufferCache(size_t clearBeforeFrame) override;
#endif
bool isComplete() const
{
if (m_frameBufferCache.isEmpty())
return false;
for (auto& imageFrame : m_frameBufferCache) {
if (imageFrame.status() != ImageFrame::FrameComplete)
return false;
}
return true;
}
bool isCompleteAtIndex(size_t index)
{
return (index < m_frameBufferCache.size() && m_frameBufferCache[index].status() == ImageFrame::FrameComplete);
}
private:
// Decodes the image. If |onlySize| is true, stops decoding after
// calculating the image size. If decoding fails but there is no more
// data coming, sets the "decode failure" flag.
void decode(bool onlySize, unsigned haltAtFrame);
#if ENABLE(APNG)
void initFrameBuffer(size_t frameIndex);
void frameComplete();
int processingStart(png_unknown_chunkp);
int processingFinish();
void fallbackNotAnimated();
#endif
std::unique_ptr<PNGImageReader> m_reader;
bool m_doNothingOnFailure;
unsigned m_currentFrame;
#if ENABLE(APNG)
png_structp m_png;
png_infop m_info;
bool m_isAnimated;
bool m_frameInfo;
bool m_frameIsHidden;
bool m_hasInfo;
int m_gamma;
size_t m_frameCount;
unsigned m_playCount;
unsigned m_totalFrames;
unsigned m_sizePLTE;
unsigned m_sizetRNS;
unsigned m_sequenceNumber;
unsigned m_width;
unsigned m_height;
unsigned m_xOffset;
unsigned m_yOffset;
unsigned m_delayNumerator;
unsigned m_delayDenominator;
unsigned m_dispose;
unsigned m_blend;
png_byte m_dataIHDR[12 + 13];
png_byte m_dataPLTE[12 + 256 * 3];
png_byte m_datatRNS[12 + 256];
#endif
};
} // namespace WebCore
#endif
|
