qemu/pixman/demos/clip-test.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include "pixman.h"
   4 #include "gtk-utils.h"
   5
   6 #define WIDTH 200
   7 #define HEIGHT 200
   8
   9 static pixman_image_t *
  10 create_solid_bits (uint32_t pixel)
  11 {
  12     uint32_t *pixels = malloc (WIDTH * HEIGHT * 4);
  13     int i;
  14
  15     for (i = 0; i < WIDTH * HEIGHT; ++i)
  16         pixels[i] = pixel;
  17
  18     return pixman_image_create_bits (PIXMAN_a8r8g8b8,
  19                                      WIDTH, HEIGHT,
  20                                      pixels,
  21                                      WIDTH * 4);
  22 }
  23
  24 int
  25 main (int argc, char **argv)
  26 {
  27     pixman_image_t *gradient_img;
  28     pixman_image_t *src_img, *dst_img;
  29     pixman_gradient_stop_t stops[2] =
  30         {
  31             { pixman_int_to_fixed (0), { 0xffff, 0x0000, 0x0000, 0xffff } },
  32             { pixman_int_to_fixed (1), { 0xffff, 0xffff, 0x0000, 0xffff } }
  33         };
  34 #if 0
  35     pixman_point_fixed_t p1 = { 0, 0 };
  36     pixman_point_fixed_t p2 = { pixman_int_to_fixed (WIDTH),
  37                                 pixman_int_to_fixed (HEIGHT) };
  38 #endif
  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     pixman_region32_t clip_region;
  44     pixman_transform_t trans = {
  45         { { pixman_double_to_fixed (1.3), pixman_double_to_fixed (0), pixman_double_to_fixed (-0.5), },
  46           { pixman_double_to_fixed (0), pixman_double_to_fixed (1), pixman_double_to_fixed (-0.5), },
  47           { pixman_double_to_fixed (0), pixman_double_to_fixed (0), pixman_double_to_fixed (1.0) }
  48         }
  49     };
  50
  51     src_img = create_solid_bits (0xff0000ff);
  52
  53     c_inner.x = pixman_double_to_fixed (100.0);
  54     c_inner.y = pixman_double_to_fixed (100.0);
  55     c_outer.x = pixman_double_to_fixed (100.0);
  56     c_outer.y = pixman_double_to_fixed (100.0);
  57     r_inner = 0;
  58     r_outer = pixman_double_to_fixed (100.0);
  59
  60     gradient_img = pixman_image_create_radial_gradient (&c_inner, &c_outer,
  61                                                         r_inner, r_outer,
  62                                                         stops, 2);
  63
  64 #if 0
  65     gradient_img = pixman_image_create_linear_gradient  (&p1, &p2,
  66                                                          stops, 2);
  67
  68 #endif
  69
  70     pixman_image_composite (PIXMAN_OP_OVER, gradient_img, NULL, src_img,
  71                             0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);
  72
  73     pixman_region32_init_rect (&clip_region, 50, 0, 100, 200);
  74     pixman_image_set_clip_region32 (src_img, &clip_region);
  75     pixman_image_set_source_clipping (src_img, TRUE);
  76     pixman_image_set_has_client_clip (src_img, TRUE);
  77     pixman_image_set_transform (src_img, &trans);
  78     pixman_image_set_repeat (src_img, PIXMAN_REPEAT_NORMAL);
  79
  80     dst_img = create_solid_bits (0xffff0000);
  81     pixman_image_composite (PIXMAN_OP_OVER, src_img, NULL, dst_img,
  82                             0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);
  83
  84
  85 #if 0
  86     printf ("0, 0: %x\n", src[0]);
  87     printf ("10, 10: %x\n", src[10 * 10 + 10]);
  88     printf ("w, h: %x\n", src[(HEIGHT - 1) * 100 + (WIDTH - 1)]);
  89 #endif
  90
  91     show_image (dst_img);
  92
  93     pixman_image_unref (gradient_img);
  94     pixman_image_unref (src_img);
  95
  96     return 0;
  97 }