mirror of
https://gitlab.freedesktop.org/cairo/cairo.git
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100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
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/*
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* Copyright © 2005 Red Hat, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Red Hat, Inc. not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Red Hat, Inc. makes no representations about the
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* suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Owen Taylor <otaylor@redhat.com>
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*/
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#include "cairo-test.h"
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#define IMAGE_WIDTH 19
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#define IMAGE_HEIGHT 19
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/* Basic test of dashed strokes, including a test for the negative
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* dash offset bug:
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*
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* https://bugs.freedesktop.org/show_bug.cgi?id=2729
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*/
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cairo_test_t test = {
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"dash-offset-negative",
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"Tests cairo_set_dash with a negative offset",
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IMAGE_WIDTH, IMAGE_HEIGHT
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};
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static cairo_test_status_t
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draw (cairo_t *cr, int width, int height)
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{
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double dashes[] = { 1 };
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cairo_set_line_width (cr, 2);
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/* Basic 1-1 dash pattern */
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cairo_set_dash (cr, dashes, 1, 0.);
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cairo_move_to (cr, 1, 2);
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cairo_line_to (cr, 18, 2);
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cairo_stroke (cr);
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/* Adjust path by 0.5. Ideally this would give a constant 50%
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* gray, (but does not due to the location of the regular sample
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* grid points. */
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cairo_move_to (cr, 1.5, 5);
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cairo_line_to (cr, 18., 5);
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cairo_stroke (cr);
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/* Offset dash by 0.5, rather than the path */
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cairo_set_dash (cr, dashes, 1, 0.5);
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cairo_move_to (cr, 1, 8);
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cairo_line_to (cr, 18, 8);
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cairo_stroke (cr);
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/* Now, similar tests with negative dash offsets. */
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/* Basic 1-1 dash pattern dashing */
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cairo_set_dash (cr, dashes, 1, -4);
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cairo_move_to (cr, 1, 11);
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cairo_line_to (cr, 18, 11);
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cairo_stroke (cr);
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/* Adjust path by 0.5 */
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cairo_move_to (cr, 1.5, 14);
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cairo_line_to (cr, 18., 14);
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cairo_stroke (cr);
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/* Offset dash by 0.5 */
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cairo_set_dash (cr, dashes, 1, -3.5);
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cairo_move_to (cr, 1, 17);
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cairo_line_to (cr, 18, 17);
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cairo_stroke (cr);
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return CAIRO_TEST_SUCCESS;
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}
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int
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main (void)
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{
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return cairo_test (&test, draw);
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}
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