1 #include <stdio.h>
2 #include <stdlib.h>
3 #include "pixman.h"
4 #include "gtk-utils.h"
5
6 int
main(int argc,char ** argv)7 main (int argc, char **argv)
8 {
9 #define WIDTH 400
10 #define HEIGHT 400
11 #define TILE_SIZE 25
12
13 pixman_image_t *checkerboard;
14 pixman_image_t *destination;
15 #define D2F(d) (pixman_double_to_fixed(d))
16 pixman_transform_t trans = { {
17 { D2F (-1.96830), D2F (-1.82250), D2F (512.12250)},
18 { D2F (0.00000), D2F (-7.29000), D2F (1458.00000)},
19 { D2F (0.00000), D2F (-0.00911), D2F (0.59231)},
20 }};
21 int i, j;
22
23 checkerboard = pixman_image_create_bits (PIXMAN_a8r8g8b8,
24 WIDTH, HEIGHT,
25 NULL, 0);
26
27 destination = pixman_image_create_bits (PIXMAN_a8r8g8b8,
28 WIDTH, HEIGHT,
29 NULL, 0);
30
31 for (i = 0; i < HEIGHT / TILE_SIZE; ++i)
32 {
33 for (j = 0; j < WIDTH / TILE_SIZE; ++j)
34 {
35 double u = (double)(j + 1) / (WIDTH / TILE_SIZE);
36 double v = (double)(i + 1) / (HEIGHT / TILE_SIZE);
37 pixman_color_t black = { 0, 0, 0, 0xffff };
38 pixman_color_t white = {
39 v * 0xffff,
40 u * 0xffff,
41 (1 - (double)u) * 0xffff,
42 0xffff };
43 pixman_color_t *c;
44 pixman_image_t *fill;
45
46 if ((j & 1) != (i & 1))
47 c = &black;
48 else
49 c = &white;
50
51 fill = pixman_image_create_solid_fill (c);
52
53 pixman_image_composite (PIXMAN_OP_SRC, fill, NULL, checkerboard,
54 0, 0, 0, 0, j * TILE_SIZE, i * TILE_SIZE,
55 TILE_SIZE, TILE_SIZE);
56 }
57 }
58
59 pixman_image_set_transform (checkerboard, &trans);
60 pixman_image_set_filter (checkerboard, PIXMAN_FILTER_BEST, NULL, 0);
61 pixman_image_set_repeat (checkerboard, PIXMAN_REPEAT_NONE);
62
63 pixman_image_composite (PIXMAN_OP_SRC,
64 checkerboard, NULL, destination,
65 0, 0, 0, 0, 0, 0,
66 WIDTH, HEIGHT);
67
68 show_image (destination);
69
70 return 0;
71 }
72