2 * Copyright © 2008 Chris Wilson
4 * Permission to use, copy, modify, distribute, and sell this software
5 * and its documentation for any purpose is hereby granted without
6 * fee, provided that the above copyright notice appear in all copies
7 * and that both that copyright notice and this permission notice
8 * appear in supporting documentation, and that the name of
9 * Chris Wilson not be used in advertising or publicity pertaining to
10 * distribution of the software without specific, written prior
11 * permission. Chris Wilson makes no representations about the
12 * suitability of this software for any purpose. It is provided "as
13 * is" without express or implied warranty.
15 * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
16 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
17 * FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL,
18 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
19 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
20 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
21 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 * Author: Chris Wilson <chris@chris-wilson.co.uk>
26 /* This test case exercises a "Potential division by zero in cairo_arc"
27 * reported by Luiz Americo Pereira Camara <luizmed@oi.com.br>,
28 * http://lists.cairographics.org/archives/cairo/2008-May/014054.html.
31 #include "cairo-test.h"
33 static cairo_test_status_t
34 draw (cairo_t *cr, int width, int height)
38 cairo_set_source_rgb (cr, 1, 1, 1);
41 cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
43 cairo_set_line_width (cr, 5);
44 cairo_set_source_rgb (cr, 0, 1, 0);
45 for (n = 0; n < 8; n++) {
46 double theta = n * 2 * M_PI / 8;
47 cairo_new_sub_path (cr);
48 cairo_arc (cr, 20, 20, 15, theta, theta);
49 cairo_close_path (cr);
53 cairo_set_line_width (cr, 2);
54 cairo_set_source_rgb (cr, 0, 0, 1);
55 for (n = 0; n < 8; n++) {
56 double theta = n * 2 * M_PI / 8;
57 cairo_move_to (cr, 20, 20);
58 cairo_arc (cr, 20, 20, 15, theta, theta);
62 cairo_set_source_rgb (cr, 1, 0, 0);
63 cairo_arc (cr, 20, 20, 2, 0, 2*M_PI);
66 return CAIRO_TEST_SUCCESS;
69 CAIRO_TEST (degenerate_arc,
70 "Tests the behaviour of degenerate arcs",
71 "degenerate", /* keywords */
72 NULL, /* requirements */