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/*
* Copyright © 2008 Chris Wilson
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Chris Wilson not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Chris Wilson makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Chris Wilson <chris@chris-wilson.co.uk>
*/
/* This test case exercises a "Potential division by zero in cairo_arc"
* reported by Luiz Americo Pereira Camara <luizmed@oi.com.br>,
* https://lists.cairographics.org/archives/cairo/2008-May/014054.html.
*/
#include "cairo-test.h"
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
int n;
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_width (cr, 5);
cairo_set_source_rgb (cr, 0, 1, 0);
for (n = 0; n < 8; n++) {
double theta = n * 2 * M_PI / 8;
cairo_new_sub_path (cr);
cairo_arc (cr, 20, 20, 15, theta, theta);
cairo_close_path (cr);
}
cairo_stroke (cr);
cairo_set_line_width (cr, 2);
cairo_set_source_rgb (cr, 0, 0, 1);
for (n = 0; n < 8; n++) {
double theta = n * 2 * M_PI / 8;
cairo_move_to (cr, 20, 20);
cairo_arc (cr, 20, 20, 15, theta, theta);
}
cairo_stroke (cr);
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_arc (cr, 20, 20, 2, 0, 2*M_PI);
cairo_fill (cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (degenerate_arc,
"Tests the behaviour of degenerate arcs",
"degenerate", /* keywords */
NULL, /* requirements */
40, 40,
NULL, draw)
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