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
84
85
86
87
88
89
90
|
/*
* 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>
*/
/* Bug history
*
* 2006-12-05 M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
*
* The tessellator has a regression where a trapezoid may continue
* below the end of a polygon edge (i.e. the bottom of the trapezoid
* is miscomputed.) This can only happen if the right edge of a
* trapezoid stops earlier than the left edge and there is no start
* event at the end point of the right edge.
*/
#include "cairo-test.h"
static cairo_test_draw_function_t draw;
#define SIZE 50
cairo_test_t test = {
"fill-missed-stop",
"Tests that the tessellator doesn't miss stop events when generating trapezoids",
SIZE+3, SIZE+3,
draw
};
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_translate (cr, 1, 1);
/* What it should look like, with # marking the filled areas:
*
* |\ |\
* |#\ |#\
* |##\__|##\
* \#|
* \|
*
* What it looke like with the bug, when the rightmost edge's end
* is missed:
*
* |\ |\
* |#\ |#\
* |##\__|##\
* \#####|
* \####|
*/
cairo_move_to (cr, 0, 0);
cairo_line_to (cr, SIZE/2, SIZE);
cairo_line_to (cr, SIZE/2, 0);
cairo_line_to (cr, SIZE, SIZE/2);
cairo_line_to (cr, 0, SIZE/2);
cairo_close_path (cr);
cairo_fill (cr);
return CAIRO_TEST_SUCCESS;
}
int
main (void)
{
return cairo_test (&test);
}
|
