2 * Copyright © 2005 Red Hat, Inc.
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 * Red Hat, Inc. not be used in advertising or publicity pertaining to
10 * distribution of the software without specific, written prior
11 * permission. Red Hat, Inc. 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 * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
16 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
17 * FITNESS, IN NO EVENT SHALL RED HAT, INC. 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: Owen Taylor <otaylor@redhat.com>
26 #include "cairo-test.h"
28 #define IMAGE_WIDTH 19
29 #define IMAGE_HEIGHT 19
31 /* Basic test of dashed strokes, including a test for the negative
34 * https://bugs.freedesktop.org/show_bug.cgi?id=2729
37 static cairo_test_status_t
38 draw (cairo_t *cr, int width, int height)
40 double dashes[] = { 1 };
42 /* We draw in the default black, so paint white first. */
44 cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
48 cairo_set_line_width (cr, 2);
50 /* Basic 1-1 dash pattern */
51 cairo_set_dash (cr, dashes, 1, 0.);
53 cairo_move_to (cr, 1, 2);
54 cairo_line_to (cr, 18, 2);
57 /* Adjust path by 0.5. Ideally this would give a constant 50%
58 * gray, (but does not due to the location of the regular sample
60 cairo_move_to (cr, 1.5, 5);
61 cairo_line_to (cr, 18., 5);
64 /* Offset dash by 0.5, rather than the path */
65 cairo_set_dash (cr, dashes, 1, 0.5);
67 cairo_move_to (cr, 1, 8);
68 cairo_line_to (cr, 18, 8);
71 /* Now, similar tests with negative dash offsets. */
73 /* Basic 1-1 dash pattern dashing */
74 cairo_set_dash (cr, dashes, 1, -4);
76 cairo_move_to (cr, 1, 11);
77 cairo_line_to (cr, 18, 11);
80 /* Adjust path by 0.5 */
81 cairo_move_to (cr, 1.5, 14);
82 cairo_line_to (cr, 18., 14);
85 /* Offset dash by 0.5 */
86 cairo_set_dash (cr, dashes, 1, -3.5);
88 cairo_move_to (cr, 1, 17);
89 cairo_line_to (cr, 18, 17);
92 return CAIRO_TEST_SUCCESS;
95 CAIRO_TEST (dash_offset_negative,
96 "Tests cairo_set_dash with a negative offset",
97 "dash, stroke", /* keywords */
98 NULL, /* requirements */
99 IMAGE_WIDTH, IMAGE_HEIGHT,