/* * 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)