1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
* Copyright © 2006 M Joonas Pihlaja
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Author: M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
*/
#include "cairo-test.h"
static cairo_test_draw_function_t draw;
#define SIZE 512
#define NUM_SEGMENTS 128
cairo_test_t test = {
"random-intersections",
"Tests the tessellator trapezoid generation and intersection computation",
SIZE+3, SIZE+3,
draw
};
static uint32_t state;
static double
uniform_random (double minval, double maxval)
{
static uint32_t const poly = 0x9a795537U;
uint32_t n = 32;
while (n-->0)
state = 2*state < state ? (2*state ^ poly) : 2*state;
return minval + state * (maxval - minval) / 4294967296.0;
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
int i;
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_paint (cr);
state = 0x12345678;
cairo_translate (cr, 1, 1);
cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
cairo_move_to (cr, 0, 0);
for (i = 0; i < NUM_SEGMENTS; i++) {
double x = uniform_random (0, width);
double y = uniform_random (0, height);
cairo_line_to (cr, x, y);
}
cairo_close_path (cr);
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_fill_preserve (cr);
cairo_set_source_rgb (cr, 0, 1, 0);
cairo_set_line_width (cr, 0.5);
cairo_stroke (cr);
return CAIRO_TEST_SUCCESS;
}
int
main (void)
{
return cairo_test (&test);
}
|
