1#include <stdio.h>
2#include <stdlib.h>
3#include "pixman.h"
4#include "gtk-utils.h"
5
6int
7main (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