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      1 #include <stdio.h>
      2 #include <stdlib.h>
      3 #include "utils.h"
      4 
      5 int
      6 main (int argc, char **argv)
      7 {
      8 #define WIDTH 400
      9 #define HEIGHT 200
     10 
     11     uint32_t *dest = malloc (WIDTH * HEIGHT * 4);
     12     pixman_image_t *src_img;
     13     pixman_image_t *dest_img;
     14     int i, j, k, p;
     15 
     16     typedef struct
     17     {
     18 	pixman_point_fixed_t p0;
     19 	pixman_point_fixed_t p1;
     20     } point_pair_t;
     21 
     22     pixman_gradient_stop_t onestop[1] =
     23 	{
     24 	    { pixman_int_to_fixed (1), { 0xffff, 0xeeee, 0xeeee, 0xeeee } },
     25 	};
     26 
     27     pixman_gradient_stop_t subsetstops[2] =
     28 	{
     29 	    { pixman_int_to_fixed (1), { 0xffff, 0xeeee, 0xeeee, 0xeeee } },
     30 	    { pixman_int_to_fixed (1), { 0xffff, 0xeeee, 0xeeee, 0xeeee } },
     31 	};
     32 
     33     pixman_gradient_stop_t stops01[2] =
     34 	{
     35 	    { pixman_int_to_fixed (0), { 0xffff, 0xeeee, 0xeeee, 0xeeee } },
     36 	    { pixman_int_to_fixed (1), { 0xffff, 0x1111, 0x1111, 0x1111 } }
     37 	};
     38 
     39     point_pair_t point_pairs [] =
     40 	{ { { pixman_double_to_fixed (0), 0 },
     41 	    { pixman_double_to_fixed (WIDTH / 8.), pixman_int_to_fixed (0) } },
     42 	  { { pixman_double_to_fixed (WIDTH / 2.0), pixman_double_to_fixed (HEIGHT / 2.0) },
     43 	    { pixman_double_to_fixed (WIDTH / 2.0), pixman_double_to_fixed (HEIGHT / 2.0) } }
     44 	};
     45 
     46     pixman_transform_t transformations[] = {
     47 	{
     48 	    { { pixman_double_to_fixed (2), pixman_double_to_fixed (0.5), pixman_double_to_fixed (-100), },
     49 	      { pixman_double_to_fixed (0), pixman_double_to_fixed (3), pixman_double_to_fixed (0), },
     50 	      { pixman_double_to_fixed (0), pixman_double_to_fixed (0.000), pixman_double_to_fixed (1.0) }
     51 	    }
     52 	},
     53 	{
     54 	    { { pixman_double_to_fixed (1), pixman_double_to_fixed (0), pixman_double_to_fixed (0), },
     55 	      { pixman_double_to_fixed (0), pixman_double_to_fixed (1), pixman_double_to_fixed (0), },
     56 	      { pixman_double_to_fixed (0), pixman_double_to_fixed (0.000), pixman_double_to_fixed (1.0) }
     57 	    }
     58 	},
     59 	{
     60 	    { { pixman_double_to_fixed (2), pixman_double_to_fixed (1), pixman_double_to_fixed (0), },
     61 	      { pixman_double_to_fixed (1), pixman_double_to_fixed (1), pixman_double_to_fixed (0), },
     62 	      { pixman_double_to_fixed (2), pixman_double_to_fixed (1.000), pixman_double_to_fixed (1.0) }
     63 	    }
     64 	},
     65 	{
     66 	    { { pixman_double_to_fixed (2), pixman_double_to_fixed (1), pixman_double_to_fixed (0), },
     67 	      { pixman_double_to_fixed (1), pixman_double_to_fixed (1), pixman_double_to_fixed (0), },
     68 	      { pixman_double_to_fixed (0), pixman_double_to_fixed (0), pixman_double_to_fixed (0) }
     69 	    }
     70 	},
     71 	{
     72 	    { { pixman_double_to_fixed (2), pixman_double_to_fixed (1), pixman_double_to_fixed (0), },
     73 	      { pixman_double_to_fixed (1), pixman_double_to_fixed (1), pixman_double_to_fixed (0), },
     74 	      { pixman_double_to_fixed (2), pixman_double_to_fixed (-1), pixman_double_to_fixed (0) }
     75 	    }
     76 	},
     77 	{
     78 	    { { pixman_double_to_fixed (2), pixman_double_to_fixed (1), pixman_double_to_fixed (3), },
     79 	      { pixman_double_to_fixed (1), pixman_double_to_fixed (1), pixman_double_to_fixed (0), },
     80 	      { pixman_double_to_fixed (2), pixman_double_to_fixed (-1), pixman_double_to_fixed (0) }
     81 	    }
     82 	},
     83     };
     84 
     85     pixman_fixed_t r_inner;
     86     pixman_fixed_t r_outer;
     87 
     88     enable_divbyzero_exceptions();
     89 
     90     for (i = 0; i < WIDTH * HEIGHT; ++i)
     91 	dest[i] = 0x4f00004f; /* pale blue */
     92 
     93     dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
     94 					 WIDTH, HEIGHT,
     95 					 dest,
     96 					 WIDTH * 4);
     97 
     98     r_inner = 0;
     99     r_outer = pixman_double_to_fixed (50.0);
    100 
    101     for (i = 0; i < 3; ++i)
    102     {
    103 	pixman_gradient_stop_t *stops;
    104         int num_stops;
    105 
    106 	if (i == 0)
    107 	{
    108 	    stops = onestop;
    109 	    num_stops = ARRAY_LENGTH (onestop);
    110 	}
    111 	else if (i == 1)
    112 	{
    113 	    stops = subsetstops;
    114 	    num_stops = ARRAY_LENGTH (subsetstops);
    115 	}
    116 	else
    117 	{
    118 	    stops = stops01;
    119 	    num_stops = ARRAY_LENGTH (stops01);
    120 	}
    121 
    122 	for (j = 0; j < 3; ++j)
    123 	{
    124 	    for (p = 0; p < ARRAY_LENGTH (point_pairs); ++p)
    125 	    {
    126 		point_pair_t *pair = &(point_pairs[p]);
    127 
    128 		if (j == 0)
    129 		    src_img = pixman_image_create_conical_gradient (&(pair->p0), r_inner,
    130 								    stops, num_stops);
    131 		else if (j == 1)
    132 		    src_img = pixman_image_create_radial_gradient  (&(pair->p0), &(pair->p1),
    133 								    r_inner, r_outer,
    134 								    stops, num_stops);
    135 		else
    136 		    src_img = pixman_image_create_linear_gradient  (&(pair->p0), &(pair->p1),
    137 								    stops, num_stops);
    138 
    139 		for (k = 0; k < ARRAY_LENGTH (transformations); ++k)
    140 		{
    141 		    pixman_image_set_transform (src_img, &transformations[k]);
    142 
    143 		    pixman_image_set_repeat (src_img, PIXMAN_REPEAT_NONE);
    144 		    pixman_image_composite (PIXMAN_OP_OVER, src_img, NULL, dest_img,
    145 					    0, 0, 0, 0, 0, 0, 10 * WIDTH, HEIGHT);
    146 		}
    147 
    148 		pixman_image_unref (src_img);
    149 	    }
    150 
    151 	}
    152     }
    153 
    154     pixman_image_unref (dest_img);
    155     free (dest);
    156 
    157     return 0;
    158 }
    159