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-rw-r--r--test/get-group-target.c85
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diff --git a/test/get-group-target.c b/test/get-group-target.c
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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)