2 * Copyright © 2006 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: Carl D. Worth <cworth@cworth.org>
26 #include "cairo-test.h"
31 static cairo_test_status_t
32 draw (cairo_t *cr, int width, int height)
34 cairo_surface_t *group;
37 /* First paint background in blue. */
38 cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
41 /* Then clip so that the group surface ends up smaller than the
42 * original surface. */
43 cairo_rectangle (cr, PAD, PAD, width - 2 * PAD, height - 2 * PAD);
46 /* Paint the clipped region in red (which should all be overwritten later). */
47 cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
50 /* Redirect to a new group and get that surface. */
51 cairo_push_group (cr);
52 group = cairo_get_group_target (cr);
54 /* Then paint in green what we query the group surface size to be. */
55 cairo_set_source_rgb (cr, 0.0, 1.0, 0.0);
56 cairo_surface_get_device_offset (group, &x, &y);
57 /* Or rather, we calculate the group surface size based on the
58 * only thing we can query which is the device offset. Ideally,
59 * the size would always be the minimal (width - 2 * PAD, height -
60 * 2 * PAD) based on the clip. But currently, group targets are
61 * created oversized for paginated surfaces, so we only subtract
62 * anything from the size if there is a non-zero device offfset.
64 * The calculation below might also be less confusing if the sign
65 * convention on the device offset were reversed, but it is what
73 /* Finish up the group painting. */
74 cairo_pop_group_to_source (cr);
77 return CAIRO_TEST_SUCCESS;
80 CAIRO_TEST (get_group_target,
81 "Test of both cairo_get_group_target and cairo_surface_get_device_offset",
83 NULL, /* requirements */