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
|
/*
* Copyright (c) 2010, Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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 PNGImageEncoder_h
#define PNGImageEncoder_h
#include "platform/geometry/IntSize.h"
extern "C" {
#include "png.h"
}
#include "wtf/Allocator.h"
#include "wtf/Vector.h"
#include <memory>
namespace blink {
struct ImageDataBuffer;
class PLATFORM_EXPORT PNGImageEncoderState final {
USING_FAST_MALLOC(PNGImageEncoderState);
WTF_MAKE_NONCOPYABLE(PNGImageEncoderState);
public:
static std::unique_ptr<PNGImageEncoderState> create(
const IntSize& imageSize,
Vector<unsigned char>* output);
~PNGImageEncoderState();
png_struct* png() {
ASSERT(m_png);
return m_png;
}
png_info* info() {
ASSERT(m_info);
return m_info;
}
private:
PNGImageEncoderState(png_struct* png, png_info* info)
: m_png(png), m_info(info) {}
png_struct* m_png;
png_info* m_info;
};
class PLATFORM_EXPORT PNGImageEncoder {
STATIC_ONLY(PNGImageEncoder);
public:
// Encode the input data with default compression quality. See also
// https://crbug.com/179289
static bool encode(const ImageDataBuffer&, Vector<unsigned char>* output);
// Functions for progressive image encoding
static void writeOneRowToPng(unsigned char* pixels, PNGImageEncoderState*);
static void finalizePng(PNGImageEncoderState*);
};
} // namespace blink
#endif
|
