clip-all.c

按照官方的说法：Cairo is a vector graphics library with cross-device output support. 翻译过来

/*
 * Copyright © 2005 Novell, 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
 * Novell, Inc. not be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior
 * permission. Novell, Inc. makes no representations about the
 * suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * NOVELL, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS, IN NO EVENT SHALL NOVELL, 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: Radek Doulík <[e-mail]>
 */

#include "cairo-test.h"

#define SIZE 10
#define CLIP_SIZE 2

cairo_test_t test = {
    "clip-all",
    "Test clipping with everything clipped out",
    SIZE, SIZE
};

static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
    cairo_rectangle (cr, 0, 0, SIZE, SIZE);
    cairo_set_source_rgb (cr, 0, 0, 1);
    cairo_fill (cr);

    cairo_reset_clip (cr);
    cairo_rectangle (cr, CLIP_SIZE, CLIP_SIZE, CLIP_SIZE, CLIP_SIZE);
    cairo_clip (cr);
    cairo_rectangle (cr, 3*CLIP_SIZE, 3*CLIP_SIZE, CLIP_SIZE, CLIP_SIZE);
    cairo_clip (cr);

    cairo_translate (cr, .5, .5);

    cairo_reset_clip (cr);
    cairo_rectangle (cr, CLIP_SIZE, CLIP_SIZE, CLIP_SIZE, CLIP_SIZE);
    cairo_clip (cr);
    cairo_rectangle (cr, 3*CLIP_SIZE, 3*CLIP_SIZE, CLIP_SIZE, CLIP_SIZE);
    cairo_clip (cr);

    cairo_rectangle (cr, 0, 0, SIZE, SIZE);
    cairo_set_source_rgb (cr, 1, 1, 0);
    cairo_fill (cr);

    return CAIRO_TEST_SUCCESS;
}

int
main (void)
{
    return cairo_test (&test, draw);
}