qemu/pixman/demos/gradient-test.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include "pixman.h"
   4 #include "gtk-utils.h"
   5
   6 int
   7 main (int argc, char **argv)
   8 {
   9 #define WIDTH 400
  10 #define HEIGHT 200
  11
  12     uint32_t *dest = malloc (WIDTH * HEIGHT * 4);
  13     pixman_image_t *src_img;
  14     pixman_image_t *dest_img;
  15     int i;
  16     pixman_gradient_stop_t stops[2] =
  17         {
  18             { pixman_int_to_fixed (0), { 0x0000, 0x0000, 0xffff, 0xffff } },
  19             { pixman_int_to_fixed (1), { 0xffff, 0x1111, 0x1111, 0xffff } }
  20         };
  21     pixman_point_fixed_t p1 = { pixman_double_to_fixed (50), 0 };
  22     pixman_point_fixed_t p2 = { pixman_double_to_fixed (200), 0 };
  23 #if 0
  24     pixman_transform_t trans = {
  25         { { pixman_double_to_fixed (2), pixman_double_to_fixed (0.5), pixman_double_to_fixed (-100), },
  26           { pixman_double_to_fixed (0), pixman_double_to_fixed (3), pixman_double_to_fixed (0), },
  27           { pixman_double_to_fixed (0), pixman_double_to_fixed (0.000), pixman_double_to_fixed (1.0) }
  28         }
  29     };
  30 #else
  31     pixman_transform_t trans = {
  32         { { pixman_fixed_1, 0, 0 },
  33           { 0, pixman_fixed_1, 0 },
  34           { 0, 0, pixman_fixed_1 } }
  35     };
  36 #endif
  37
  38 #if 0
  39     pixman_point_fixed_t c_inner;
  40     pixman_point_fixed_t c_outer;
  41     pixman_fixed_t r_inner;
  42     pixman_fixed_t r_outer;
  43 #endif
  44
  45     for (i = 0; i < WIDTH * HEIGHT; ++i)
  46         dest[i] = 0xff00ff00;
  47
  48     dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
  49                                          WIDTH, HEIGHT,
  50                                          dest,
  51                                          WIDTH * 4);
  52
  53 #if 0
  54     c_inner.x = pixman_double_to_fixed (50.0);
  55     c_inner.y = pixman_double_to_fixed (50.0);
  56     c_outer.x = pixman_double_to_fixed (50.0);
  57     c_outer.y = pixman_double_to_fixed (50.0);
  58     r_inner = 0;
  59     r_outer = pixman_double_to_fixed (50.0);
  60
  61     src_img = pixman_image_create_conical_gradient (&c_inner, r_inner,
  62                                                     stops, 2);
  63 #endif
  64 #if 0
  65     src_img = pixman_image_create_conical_gradient (&c_inner, r_inner,
  66                                                     stops, 2);
  67     src_img = pixman_image_create_linear_gradient (&c_inner, &c_outer,
  68                                                    r_inner, r_outer,
  69                                                    stops, 2);
  70 #endif
  71
  72     src_img = pixman_image_create_linear_gradient  (&p1, &p2,
  73                                                     stops, 2);
  74
  75     pixman_image_set_transform (src_img, &trans);
  76     pixman_image_set_repeat (src_img, PIXMAN_REPEAT_NONE);
  77
  78     pixman_image_composite (PIXMAN_OP_OVER, src_img, NULL, dest_img,
  79                             0, 0, 0, 0, 0, 0, 10 * WIDTH, HEIGHT);
  80
  81     printf ("0, 0: %x\n", dest[0]);
  82     printf ("10, 10: %x\n", dest[10 * 10 + 10]);
  83     printf ("w, h: %x\n", dest[(HEIGHT - 1) * 100 + (WIDTH - 1)]);
  84
  85     show_image (dest_img);
  86
  87     pixman_image_unref (src_img);
  88     pixman_image_unref (dest_img);
  89     free (dest);
  90
  91     return 0;
  92 }