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
135
|
/*
* Copyright © 2007 Nicolai Haehnle
* Copyright © 2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef PIGLIT_HAS_PNG
#include <png.h>
#endif
#include <piglit/gl_wrap.h>
#define aborts(s) _abortf("piglit_write_png: %s", s)
#define abortf(s, ...) _abortf("piglit_write_png" s, __VA_ARGS__)
static void
_abortf(const char *s, ...)
{
va_list args;
va_start(args, s);
vfprintf(stderr, s, args);
fprintf(stderr, "\n");
va_end(args);
abort();
}
/* Write a PNG file.
*
* \param filename The filename to write (i.e. "foo.png")
* \param base_format GL_RGBA or GL_RGB
* \param width The width of the image
* \param height The height of the image
* \param data The image data stored as unsigned bytes
* \param flip_y Whether to flip the image upside down (for FBO data)
*/
void
piglit_write_png(const char *filename,
GLenum base_format,
int width,
int height,
GLubyte *data,
bool flip_y)
{
#ifndef PIGLIT_HAS_PNG
aborts("Piglit not built with libpng support.");
#else
FILE *fp;
png_structp png;
png_infop info;
GLubyte *row;
int bytes;
int color_type;
int y;
switch (base_format) {
case GL_RGBA:
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
bytes = 4;
break;
case GL_RGB:
color_type = PNG_COLOR_TYPE_RGB;
bytes = 3;
break;
default:
abortf("unknown format %04x", base_format);
break;
}
fp = fopen(filename, "wb");
if (!fp)
abortf("failed to open `%s'", filename);
png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png)
aborts("png_create_write_struct() failed");
info = png_create_info_struct(png);
if (!info)
aborts("png_create_info_struct failed");
if (setjmp(png_jmpbuf(png)))
aborts("png_init_io failed");
png_init_io(png, fp);
/* write header */
if (setjmp(png_jmpbuf(png)))
aborts("Write error");
png_set_IHDR(png, info, width, height,
8, color_type, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
png_write_info(png, info);
if (flip_y) {
row = data + (height * width * bytes);
for (y = 0; y < height; ++y) {
row -= width * bytes;
png_write_row(png, row);
}
} else {
row = data;
for (y = 0; y < height; ++y) {
png_write_row(png, row);
row += width * bytes;
}
}
png_write_end(png, 0);
fclose(fp);
#endif
}
|
