qemu/pixman/demos/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 #if 0
  44     pixman_point_fixed_t c_inner;
  45     pixman_point_fixed_t c_outer;
  46     pixman_fixed_t r_inner;
  47     pixman_fixed_t r_outer;
  48 #endif
  49
  50     for (i = 0; i < WIDTH * HEIGHT; ++i)
  51         alpha[i] = 0x4f00004f; /* pale blue */
  52
  53     alpha_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
  54                                          WIDTH, HEIGHT,
  55                                           alpha,
  56                                          WIDTH * 4);
  57
  58     for (i = 0; i < WIDTH * HEIGHT; ++i)
  59         dest[i] = 0xffffff00;           /* yellow */
  60
  61     dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
  62                                          WIDTH, HEIGHT,
  63                                          dest,
  64                                          WIDTH * 4);
  65
  66     for (i = 0; i < WIDTH * HEIGHT; ++i)
  67         src[i] = 0xffff0000;
  68
  69     src_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
  70                                         WIDTH, HEIGHT,
  71                                         src,
  72                                         WIDTH * 4);
  73
  74 #if 0
  75     c_inner.x = pixman_double_to_fixed (50.0);
  76     c_inner.y = pixman_double_to_fixed (50.0);
  77     c_outer.x = pixman_double_to_fixed (50.0);
  78     c_outer.y = pixman_double_to_fixed (50.0);
  79     r_inner = 0;
  80     r_outer = pixman_double_to_fixed (50.0);
  81
  82     grad_img = pixman_image_create_conical_gradient (&c_inner, r_inner,
  83                                                     stops, 2);
  84 #endif
  85 #if 0
  86     grad_img = pixman_image_create_conical_gradient (&c_inner, r_inner,
  87                                                     stops, 2);
  88     grad_img = pixman_image_create_linear_gradient (&c_inner, &c_outer,
  89                                                    r_inner, r_outer,
  90                                                    stops, 2);
  91 #endif
  92
  93     grad_img = pixman_image_create_linear_gradient  (&p1, &p2,
  94                                                     stops, 2);
  95
  96     pixman_image_set_transform (grad_img, &trans);
  97     pixman_image_set_repeat (grad_img, PIXMAN_REPEAT_PAD);
  98
  99     pixman_image_composite (PIXMAN_OP_OVER, grad_img, NULL, alpha_img,
 100                             0, 0, 0, 0, 0, 0, 10 * WIDTH, HEIGHT);
 101
 102     pixman_image_set_alpha_map (src_img, alpha_img, 10, 10);
 103
 104     pixman_image_composite (PIXMAN_OP_OVER, src_img, NULL, dest_img,
 105                             0, 0, 0, 0, 0, 0, 10 * WIDTH, HEIGHT);
 106
 107     printf ("0, 0: %x\n", dest[0]);
 108     printf ("10, 10: %x\n", dest[10 * 10 + 10]);
 109     printf ("w, h: %x\n", dest[(HEIGHT - 1) * 100 + (WIDTH - 1)]);
 110
 111     show_image (dest_img);
 112
 113     pixman_image_unref (src_img);
 114     pixman_image_unref (grad_img);
 115     pixman_image_unref (alpha_img);
 116     free (dest);
 117
 118     return 0;
 119 }