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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>,
+ * http://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)