test/alpha-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 *alpha = malloc (WIDTH * HEIGHT * 4);
  13     uint32_t *dest = malloc (WIDTH * HEIGHT * 4);
  14     uint32_t *src = malloc (WIDTH * HEIGHT * 4);
  15     pixman_image_t *grad_img;
  16     pixman_image_t *alpha_img;
  17     pixman_image_t *dest_img;
  18     pixman_image_t *src_img;
  19     int i;
  20     pixman_gradient_stop_t stops[2] =
  21         {
  22             { pixman_int_to_fixed (0), { 0x0000, 0x0000, 0x0000, 0x0000 } },
  23             { pixman_int_to_fixed (1), { 0xffff, 0x0000, 0x1111, 0xffff } }
  24         };
  25     pixman_point_fixed_t p1 = { pixman_double_to_fixed (0), 0 };
  26     pixman_point_fixed_t p2 = { pixman_double_to_fixed (WIDTH),
  27                                 pixman_int_to_fixed (0) };
  28 #if 0
  29     pixman_transform_t trans = {
  30         { { pixman_double_to_fixed (2), pixman_double_to_fixed (0.5), pixman_double_to_fixed (-100), },
  31           { pixman_double_to_fixed (0), pixman_double_to_fixed (3), pixman_double_to_fixed (0), },
  32           { pixman_double_to_fixed (0), pixman_double_to_fixed (0.000), pixman_double_to_fixed (1.0) }
  33         }
  34     };
  35 #else
  36     pixman_transform_t trans = {
  37         { { pixman_fixed_1, 0, 0 },
  38           { 0, pixman_fixed_1, 0 },
  39           { 0, 0, pixman_fixed_1 } }
  40     };
  41 #endif
  42
  43     pixman_point_fixed_t c_inner;
  44     pixman_point_fixed_t c_outer;
  45     pixman_fixed_t r_inner;
  46     pixman_fixed_t r_outer;
  47
  48     for (i = 0; i < WIDTH * HEIGHT; ++i)
  49         alpha[i] = 0x4f00004f; /* pale blue */
  50
  51     alpha_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
  52                                          WIDTH, HEIGHT,
  53                                           alpha,
  54                                          WIDTH * 4);
  55
  56     for (i = 0; i < WIDTH * HEIGHT; ++i)
  57         dest[i] = 0xffffff00;           /* yellow */
  58
  59     dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
  60                                          WIDTH, HEIGHT,
  61                                          dest,
  62                                          WIDTH * 4);
  63
  64     for (i = 0; i < WIDTH * HEIGHT; ++i)
  65         src[i] = 0xffff0000;
  66
  67     src_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
  68                                         WIDTH, HEIGHT,
  69                                         src,
  70                                         WIDTH * 4);
  71
  72     c_inner.x = pixman_double_to_fixed (50.0);
  73     c_inner.y = pixman_double_to_fixed (50.0);
  74     c_outer.x = pixman_double_to_fixed (50.0);
  75     c_outer.y = pixman_double_to_fixed (50.0);
  76     r_inner = 0;
  77     r_outer = pixman_double_to_fixed (50.0);
  78
  79 #if 0
  80     grad_img = pixman_image_create_conical_gradient (&c_inner, r_inner,
  81                                                     stops, 2);
  82 #endif
  83 #if 0
  84     grad_img = pixman_image_create_conical_gradient (&c_inner, r_inner,
  85                                                     stops, 2);
  86     grad_img = pixman_image_create_linear_gradient (&c_inner, &c_outer,
  87                                                    r_inner, r_outer,
  88                                                    stops, 2);
  89 #endif
  90
  91     grad_img = pixman_image_create_linear_gradient  (&p1, &p2,
  92                                                     stops, 2);
  93
  94     pixman_image_set_transform (grad_img, &trans);
  95     pixman_image_set_repeat (grad_img, PIXMAN_REPEAT_PAD);
  96
  97     pixman_image_composite (PIXMAN_OP_OVER, grad_img, NULL, alpha_img,
  98                             0, 0, 0, 0, 0, 0, 10 * WIDTH, HEIGHT);
  99
 100     pixman_image_set_alpha_map (src_img, alpha_img, 10, 10);
 101
 102     pixman_image_composite (PIXMAN_OP_OVER, src_img, NULL, dest_img,
 103                             0, 0, 0, 0, 0, 0, 10 * WIDTH, HEIGHT);
 104
 105     printf ("0, 0: %x\n", dest[0]);
 106     printf ("10, 10: %x\n", dest[10 * 10 + 10]);
 107     printf ("w, h: %x\n", dest[(HEIGHT - 1) * 100 + (WIDTH - 1)]);
 108
 109     show_image (dest_img);
 110
 111     pixman_image_unref (src_img);
 112     pixman_image_unref (grad_img);
 113     pixman_image_unref (alpha_img);
 114     free (dest);
 115
 116     return 0;
 117 }