test/a1-trap-test.c

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "utils.h"

int
main (int argc, char **argv)
{
#define WIDTH 20
#define HEIGHT 20

    pixman_image_t *src_img;
    pixman_image_t *mask_img;
    pixman_image_t *dest_img;
    pixman_trap_t trap;
    pixman_color_t red = { 0xffff, 0x0000, 0x0000, 0xffff };
    uint32_t *bits = malloc (WIDTH * HEIGHT * 4);
    uint32_t *mbits = malloc (WIDTH * HEIGHT);

    memset (mbits, 0, WIDTH * HEIGHT);
    memset (bits, 0xff, WIDTH * HEIGHT * 4);
    
    trap.top.l = pixman_double_to_fixed (0.5);
    trap.top.r = pixman_double_to_fixed (1.5);
    trap.top.y = pixman_double_to_fixed (0.5);

    trap.bot.l = pixman_double_to_fixed (0.5);
    trap.bot.r = pixman_double_to_fixed (1.5);
    trap.bot.y = pixman_double_to_fixed (1.5);

    mask_img = pixman_image_create_bits (
	PIXMAN_a1, WIDTH, HEIGHT, mbits, WIDTH);
    src_img = pixman_image_create_solid_fill (&red);
    dest_img = pixman_image_create_bits (
	PIXMAN_a8r8g8b8, WIDTH, HEIGHT, bits, WIDTH * 4);
    
    pixman_add_traps (mask_img, 0, 0, 1, &trap);

    pixman_image_composite (PIXMAN_OP_OVER,
			    src_img, mask_img, dest_img,
			    0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);

    assert (bits[0] == 0xffff0000);
    assert (bits[1] == 0xffffffff);
    assert (bits[1 * WIDTH + 0] == 0xffffffff);
    assert (bits[1 * WIDTH + 1] == 0xffffffff);

    /* The check-formats test depends on operator_name() and format_name() returning
     * these precise formats, so if those change, check-formats.c must be updated too.
     */
    assert (
        strcmp (operator_name (PIXMAN_OP_DISJOINT_OVER), "PIXMAN_OP_DISJOINT_OVER") == 0);
    assert (
        strcmp (format_name (PIXMAN_r5g6b5), "r5g6b5") == 0);
    
    return 0;
}