xenocara/lib/pixman/demos/linear-gradient.c

51 lines
1.1 KiB
C

#include "../test/utils.h"
#include "gtk-utils.h"
#define WIDTH 1024
#define HEIGHT 640
int
main (int argc, char **argv)
{
pixman_image_t *src_img, *dest_img;
pixman_gradient_stop_t stops[] = {
{ 0x00000, { 0x0000, 0x0000, 0x4444, 0xdddd } },
{ 0x10000, { 0xeeee, 0xeeee, 0x8888, 0xdddd } },
#if 0
/* These colors make it very obvious that dithering
* is useful even for 8-bit gradients
*/
{ 0x00000, { 0x6666, 0x3333, 0x3333, 0xffff } },
{ 0x10000, { 0x3333, 0x6666, 0x6666, 0xffff } },
#endif
};
pixman_point_fixed_t p1, p2;
enable_divbyzero_exceptions ();
dest_img = pixman_image_create_bits (PIXMAN_x8r8g8b8,
WIDTH, HEIGHT,
NULL, 0);
p1.x = p1.y = 0x0000;
p2.x = WIDTH << 16;
p2.y = HEIGHT << 16;
src_img = pixman_image_create_linear_gradient (&p1, &p2, stops, ARRAY_LENGTH (stops));
pixman_image_composite32 (PIXMAN_OP_OVER,
src_img,
NULL,
dest_img,
0, 0,
0, 0,
0, 0,
WIDTH, HEIGHT);
show_image (dest_img);
pixman_image_unref (dest_img);
return 0;
}