qemu/pixman/demos/linear-gradient.c

   1 #include "../test/utils.h"
   2 #include "gtk-utils.h"
   3
   4 #define WIDTH 1024
   5 #define HEIGHT 640
   6
   7 int
   8 main (int argc, char **argv)
   9 {
  10     pixman_image_t *src_img, *dest_img;
  11     pixman_gradient_stop_t stops[] = {
  12         { 0x00000, { 0x0000, 0x0000, 0x4444, 0xdddd } },
  13         { 0x10000, { 0xeeee, 0xeeee, 0x8888, 0xdddd } },
  14 #if 0
  15         /* These colors make it very obvious that dithering
  16          * is useful even for 8-bit gradients
  17          */
  18         { 0x00000, { 0x6666, 0x3333, 0x3333, 0xffff } },
  19         { 0x10000, { 0x3333, 0x6666, 0x6666, 0xffff } },
  20 #endif
  21     };
  22     pixman_point_fixed_t p1, p2;
  23
  24     enable_divbyzero_exceptions ();
  25
  26     dest_img = pixman_image_create_bits (PIXMAN_x8r8g8b8,
  27                                          WIDTH, HEIGHT,
  28                                          NULL, 0);
  29
  30     p1.x = p1.y = 0x0000;
  31     p2.x = WIDTH << 16;
  32     p2.y = HEIGHT << 16;
  33
  34     src_img = pixman_image_create_linear_gradient (&p1, &p2, stops, ARRAY_LENGTH (stops));
  35
  36     pixman_image_composite32 (PIXMAN_OP_OVER,
  37                               src_img,
  38                               NULL,
  39                               dest_img,
  40                               0, 0,
  41                               0, 0,
  42                               0, 0,
  43                               WIDTH, HEIGHT);
  44
  45     show_image (dest_img);
  46
  47     pixman_image_unref (dest_img);
  48
  49     return 0;
  50 }