alphamap.c revision 952204ab 
1#include <stdio.h>
2#include <stdlib.h>
3#include "utils.h"
4
5#define WIDTH 400
6#define HEIGHT 200
7
8int
9main (int argc, char **argv)
10{
11    uint8_t *alpha = make_random_bytes (WIDTH * HEIGHT);
12    uint32_t *src = (uint32_t *)make_random_bytes (WIDTH * HEIGHT * 4);
13    uint32_t *dest = (uint32_t *)make_random_bytes (WIDTH * HEIGHT * 4);
14    int i;
15
16    pixman_image_t *a = pixman_image_create_bits (PIXMAN_a8, WIDTH, HEIGHT, (uint32_t *)alpha, WIDTH);
17    pixman_image_t *d = pixman_image_create_bits (PIXMAN_a8r8g8b8, WIDTH, HEIGHT, dest, WIDTH * 4);
18
19    for (i = 0; i < 2; ++i)
20    {
21	pixman_format_code_t sformat = (i == 0)? PIXMAN_a8r8g8b8 : PIXMAN_a2r10g10b10;
22	pixman_image_t *s = pixman_image_create_bits (sformat, WIDTH, HEIGHT, src, WIDTH * 4);
23	int j, k;
24
25	pixman_image_set_alpha_map (s, a, 0, 0);
26
27	pixman_image_composite (PIXMAN_OP_SRC, s, NULL, d, 0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);
28
29	for (j = 0; j < HEIGHT; ++j)
30	{
31	    for (k = 0; k < WIDTH; ++k)
32	    {
33		uint8_t ap = ((uint8_t *)alpha)[j * WIDTH + k];
34		uint32_t dap = (dest[j * WIDTH + k] >> 24);
35		uint32_t sap = (src[j * WIDTH + k] >> 24);
36
37		if (ap != dap)
38		{
39		    printf ("Wrong alpha value at (%d, %d). Should be %d; got %d (src was %d)\n", k, j, ap, dap, sap);
40		    return 1;
41		}
42	    }
43	}
44
45	pixman_image_unref (s);
46    }
47
48    return 0;
49}
50