Grcov report - get-group-target.c

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/*

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 * Copyright © 2006 Red Hat, Inc.

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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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 * 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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 * Author: Carl D. Worth <cworth@cworth.org>

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*/

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#include "cairo-test.h"

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#define SIZE 8

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#define PAD 2

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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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    cairo_surface_t *group;

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    double x, y;

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    /* First paint background in blue. */

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3

    cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);

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3

    cairo_paint (cr);

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    /* Then clip so that the group surface ends up smaller than the

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     * original surface. */

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    cairo_rectangle (cr, PAD, PAD, width - 2 * PAD, height - 2 * PAD);

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    cairo_clip (cr);

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    /* Paint the clipped region in red (which should all be overwritten later). */

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    cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);

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    cairo_paint (cr);

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    /* Redirect to a new group and get that surface. */

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    cairo_push_group (cr);

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    group = cairo_get_group_target (cr);

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    /* Then paint in green what we query the group surface size to be. */

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    cairo_set_source_rgb (cr, 0.0, 1.0, 0.0);

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    cairo_surface_get_device_offset (group, &x, &y);

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    /* Or rather, we calculate the group surface size based on the

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     * only thing we can query which is the device offset. Ideally,

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     * the size would always be the minimal (width - 2 * PAD, height -

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     * 2 * PAD) based on the clip. But currently, group targets are

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     * created oversized for paginated surfaces, so we only subtract

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     * anything from the size if there is a non-zero device offfset.

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     * The calculation below might also be less confusing if the sign

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     * convention on the device offset were reversed, but it is what

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     * it is. Oh well. */

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    cairo_rectangle (cr,

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		     -x, -y,

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		     width + 2 * x,

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		     height + 2 * y);

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    cairo_fill (cr);

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    /* Finish up the group painting. */

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    cairo_pop_group_to_source (cr);

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    cairo_paint (cr);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (get_group_target,

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	    "Test of both cairo_get_group_target and cairo_surface_get_device_offset",

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	    "api", /* keywords */

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	    NULL, /* requirements */

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	    SIZE, SIZE,

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	    NULL, draw)