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/*
* Copyright © 2005 Red Hat, Inc.
*
* 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
* Red Hat, Inc. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Red Hat, Inc. makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL RED HAT, INC. 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: Owen Taylor <otaylor@redhat.com>
*/
#include "cairo-test.h"
#define IMAGE_WIDTH 19
#define IMAGE_HEIGHT 19
/* Basic test of dashed strokes, including a test for the negative
* dash offset bug:
*
* https://bugs.freedesktop.org/show_bug.cgi?id=2729
*/
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
double dashes[] = { 1 };
/* We draw in the default black, so paint white first. */
cairo_save (cr);
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
cairo_paint (cr);
cairo_restore (cr);
cairo_set_line_width (cr, 2);
/* Basic 1-1 dash pattern */
cairo_set_dash (cr, dashes, 1, 0.);
cairo_move_to (cr, 1, 2);
cairo_line_to (cr, 18, 2);
cairo_stroke (cr);
/* Adjust path by 0.5. Ideally this would give a constant 50%
* gray, (but does not due to the location of the regular sample
* grid points. */
cairo_move_to (cr, 1.5, 5);
cairo_line_to (cr, 18., 5);
cairo_stroke (cr);
/* Offset dash by 0.5, rather than the path */
cairo_set_dash (cr, dashes, 1, 0.5);
cairo_move_to (cr, 1, 8);
cairo_line_to (cr, 18, 8);
cairo_stroke (cr);
/* Now, similar tests with negative dash offsets. */
/* Basic 1-1 dash pattern dashing */
cairo_set_dash (cr, dashes, 1, -4);
cairo_move_to (cr, 1, 11);
cairo_line_to (cr, 18, 11);
cairo_stroke (cr);
/* Adjust path by 0.5 */
cairo_move_to (cr, 1.5, 14);
cairo_line_to (cr, 18., 14);
cairo_stroke (cr);
/* Offset dash by 0.5 */
cairo_set_dash (cr, dashes, 1, -3.5);
cairo_move_to (cr, 1, 17);
cairo_line_to (cr, 18, 17);
cairo_stroke (cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (dash_offset_negative,
"Tests cairo_set_dash with a negative offset",
"dash, stroke", /* keywords */
NULL, /* requirements */
IMAGE_WIDTH, IMAGE_HEIGHT,
NULL, draw)
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