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
|
#include <stdio.h>
#include <stdlib.h>
#include "pixman.h"
#include "gtk-utils.h"
int
main (int argc, char **argv)
{
#define WIDTH 400
#define HEIGHT 400
#define TILE_SIZE 25
pixman_image_t *checkerboard;
pixman_image_t *destination;
#define D2F(d) (pixman_double_to_fixed(d))
pixman_transform_t trans = { {
{ D2F (-1.96830), D2F (-1.82250), D2F (512.12250)},
{ D2F (0.00000), D2F (-7.29000), D2F (1458.00000)},
{ D2F (0.00000), D2F (-0.00911), D2F (0.59231)},
}};
int i, j;
checkerboard = pixman_image_create_bits (PIXMAN_a8r8g8b8,
WIDTH, HEIGHT,
NULL, 0);
destination = pixman_image_create_bits (PIXMAN_a8r8g8b8,
WIDTH, HEIGHT,
NULL, 0);
for (i = 0; i < HEIGHT / TILE_SIZE; ++i)
{
for (j = 0; j < WIDTH / TILE_SIZE; ++j)
{
double u = (double)(j + 1) / (WIDTH / TILE_SIZE);
double v = (double)(i + 1) / (HEIGHT / TILE_SIZE);
pixman_color_t black = { 0, 0, 0, 0xffff };
pixman_color_t white = {
v * 0xffff,
u * 0xffff,
(1 - (double)u) * 0xffff,
0xffff };
pixman_color_t *c;
pixman_image_t *fill;
if ((j & 1) != (i & 1))
c = &black;
else
c = &white;
fill = pixman_image_create_solid_fill (c);
pixman_image_composite (PIXMAN_OP_SRC, fill, NULL, checkerboard,
0, 0, 0, 0, j * TILE_SIZE, i * TILE_SIZE,
TILE_SIZE, TILE_SIZE);
}
}
pixman_image_set_transform (checkerboard, &trans);
pixman_image_set_filter (checkerboard, PIXMAN_FILTER_BEST, NULL, 0);
pixman_image_set_repeat (checkerboard, PIXMAN_REPEAT_NONE);
pixman_image_composite (PIXMAN_OP_SRC,
checkerboard, NULL, destination,
0, 0, 0, 0, 0, 0,
WIDTH, HEIGHT);
show_image (destination);
return 0;
}
|
