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/*
* Copyright © 2006 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: Carl D. Worth <cworth@cworth.org>
*/
#include "cairo-test.h"
#define SIZE 8
#define PAD 2
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_surface_t *group;
double x, y;
/* First paint background in blue. */
cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
cairo_paint (cr);
/* Then clip so that the group surface ends up smaller than the
* original surface. */
cairo_rectangle (cr, PAD, PAD, width - 2 * PAD, height - 2 * PAD);
cairo_clip (cr);
/* Paint the clipped region in red (which should all be overwritten later). */
cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
cairo_paint (cr);
/* Redirect to a new group and get that surface. */
cairo_push_group (cr);
group = cairo_get_group_target (cr);
/* Then paint in green what we query the group surface size to be. */
cairo_set_source_rgb (cr, 0.0, 1.0, 0.0);
cairo_surface_get_device_offset (group, &x, &y);
/* Or rather, we calculate the group surface size based on the
* only thing we can query which is the device offset. Ideally,
* the size would always be the minimal (width - 2 * PAD, height -
* 2 * PAD) based on the clip. But currently, group targets are
* created oversized for paginated surfaces, so we only subtract
* anything from the size if there is a non-zero device offfset.
*
* The calculation below might also be less confusing if the sign
* convention on the device offset were reversed, but it is what
* it is. Oh well. */
cairo_rectangle (cr,
-x, -y,
width + 2 * x,
height + 2 * y);
cairo_fill (cr);
/* Finish up the group painting. */
cairo_pop_group_to_source (cr);
cairo_paint (cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (get_group_target,
"Test of both cairo_get_group_target and cairo_surface_get_device_offset",
"api", /* keywords */
NULL, /* requirements */
SIZE, SIZE,
NULL, draw)
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