IABSD.fr/xenocara/lib/pixman/demos/checkerboard.c

Branch : - branch - master - tag -

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  Commit

• Author : matthieu
  Date : 2012-08-17 16:15:20
  Hash : 5c94d108
  Message : Update to pixman 0.26.2. tested at least by ajacoutot@, mpi@, shadchin@.

• lib/pixman/demos/checkerboard.c

• #include <stdio.h>
  #include <stdlib.h>
  #include "pixman.h"
  #include "gtk-utils.h"
  
  int
  main (int argc, char **argv)
  {
  #define WIDTH 400
  #define HEIGHT 400
  #define TILE_SIZE 25
  
      pixman_image_t *checkerboard;
      pixman_image_t *destination;
  #define D2F(d) (pixman_double_to_fixed(d))
      pixman_transform_t trans = { {
  	    { D2F (-1.96830), D2F (-1.82250), D2F (512.12250)},
  	    { D2F (0.00000), D2F (-7.29000), D2F (1458.00000)},
  	    { D2F (0.00000), D2F (-0.00911), D2F (0.59231)},
  	}};
      int i, j;
  
      checkerboard = pixman_image_create_bits (PIXMAN_a8r8g8b8,
  					     WIDTH, HEIGHT,
  					     NULL, 0);
  
      destination = pixman_image_create_bits (PIXMAN_a8r8g8b8,
  					    WIDTH, HEIGHT,
  					    NULL, 0);
  
      for (i = 0; i < HEIGHT / TILE_SIZE; ++i)
      {
  	for (j = 0; j < WIDTH / TILE_SIZE; ++j)
  	{
  	    double u = (double)(j + 1) / (WIDTH / TILE_SIZE);
  	    double v = (double)(i + 1) / (HEIGHT / TILE_SIZE);
  	    pixman_color_t black = { 0, 0, 0, 0xffff };
  	    pixman_color_t white = {
  		v * 0xffff,
  		u * 0xffff,
  		(1 - (double)u) * 0xffff,
  		0xffff };
  	    pixman_color_t *c;
  	    pixman_image_t *fill;
  
  	    if ((j & 1) != (i & 1))
  		c = &black;
  	    else
  		c = &white;
  
  	    fill = pixman_image_create_solid_fill (c);
  
  	    pixman_image_composite (PIXMAN_OP_SRC, fill, NULL, checkerboard,
  				    0, 0, 0, 0, j * TILE_SIZE, i * TILE_SIZE,
  				    TILE_SIZE, TILE_SIZE);
  	}
      }
  
      pixman_image_set_transform (checkerboard, &trans);
      pixman_image_set_filter (checkerboard, PIXMAN_FILTER_BEST, NULL, 0);
      pixman_image_set_repeat (checkerboard, PIXMAN_REPEAT_NONE);
  
      pixman_image_composite (PIXMAN_OP_SRC,
  			    checkerboard, NULL, destination,
  			    0, 0, 0, 0, 0, 0,
  			    WIDTH, HEIGHT);
  
      show_image (destination);
  
      return 0;
  }