2 * Copyright © 2000 SuSE, Inc.
3 * Copyright © 2007 Red Hat, Inc.
5 * Permission to use, copy, modify, distribute, and sell this software and its
6 * documentation for any purpose is hereby granted without fee, provided that
7 * the above copyright notice appear in all copies and that both that
8 * copyright notice and this permission notice appear in supporting
9 * documentation, and that the name of SuSE not be used in advertising or
10 * publicity pertaining to distribution of the software without specific,
11 * written prior permission. SuSE makes no representations about the
12 * suitability of this software for any purpose. It is provided "as is"
13 * without express or implied warranty.
15 * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
17 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
19 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
20 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
25 #include "pixman-private.h"
27 PIXMAN_EXPORT pixman_image_t *
28 pixman_image_create_radial_gradient (pixman_point_fixed_t *inner,
29 pixman_point_fixed_t *outer,
30 pixman_fixed_t inner_radius,
31 pixman_fixed_t outer_radius,
32 const pixman_gradient_stop_t *stops,
35 pixman_image_t *image;
36 radial_gradient_t *radial;
38 return_val_if_fail (n_stops >= 2, NULL);
40 image = _pixman_image_allocate();
45 radial = &image->radial;
47 if (!_pixman_init_gradient (&radial->common, stops, n_stops))
55 radial->c1.x = inner->x;
56 radial->c1.y = inner->y;
57 radial->c1.radius = inner_radius;
58 radial->c2.x = outer->x;
59 radial->c2.y = outer->y;
60 radial->c2.radius = outer_radius;
61 radial->cdx = pixman_fixed_to_double (radial->c2.x - radial->c1.x);
62 radial->cdy = pixman_fixed_to_double (radial->c2.y - radial->c1.y);
63 radial->dr = pixman_fixed_to_double (radial->c2.radius - radial->c1.radius);
64 radial->A = (radial->cdx * radial->cdx
65 + radial->cdy * radial->cdy
66 - radial->dr * radial->dr);