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
|
/* -*- C -*-
* This program is written by Henning Makholm, and is in the
* public domain.
*/
#include <png.h>
#include <stdio.h>
#include <stdlib.h>
static void
error(png_structp png_ptr, png_const_charp errormsg)
{
fprintf(stderr,"PNG error: %s\n",errormsg);
exit(1);
}
int
main(void)
{
png_structp libpng = NULL ;
png_infop libpng2 = NULL ;
unsigned char row[TEST_IMAGE_WIDTH*4] ;
unsigned x,y ;
int r,g,b,a ;
libpng = png_create_write_struct(PNG_LIBPNG_VER_STRING,
png_voidp_NULL,
error,
png_error_ptr_NULL);
if( !libpng )
error(libpng,"Couldn't initialize libpng library");
libpng2 = png_create_info_struct(libpng);
if( !libpng2 )
error(libpng,"Couldn't create PNG info structure");
png_init_io(libpng,stdout);
png_set_IHDR(libpng,libpng2,TEST_IMAGE_WIDTH,TEST_IMAGE_HEIGHT,
8, PNG_COLOR_TYPE_RGB_ALPHA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
png_write_info(libpng,libpng2);
for( y=0; y<TEST_IMAGE_HEIGHT; y++ ) {
for( x=0; x<TEST_IMAGE_WIDTH; x++ ) {
makepixel(x,y,&r,&g,&b,&a);
row[x*4+0] = r ;
row[x*4+1] = g ;
row[x*4+2] = b ;
row[x*4+3] = a ;
}
png_write_row(libpng,row);
}
png_write_end(libpng,libpng2);
return 0 ;
}
|
