2 * Copyright © 2000 SuSE, Inc.
3 * Copyright © 2007 Red Hat, Inc.
4 * Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
5 * 2005 Lars Knoll & Zack Rusin, Trolltech
7 * Permission to use, copy, modify, distribute, and sell this software and its
8 * documentation for any purpose is hereby granted without fee, provided that
9 * the above copyright notice appear in all copies and that both that
10 * copyright notice and this permission notice appear in supporting
11 * documentation, and that the name of Keith Packard not be used in
12 * advertising or publicity pertaining to distribution of the software without
13 * specific, written prior permission. Keith Packard makes no
14 * representations about the suitability of this software for any purpose. It
15 * is provided "as is" without express or implied warranty.
17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
18 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
19 * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
20 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
21 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
22 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
23 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
33 #include "pixman-private.h"
35 static force_inline double
36 coordinates_to_parameter (double x, double y, double angle)
40 t = atan2 (y, x) + angle;
48 return 1 - t * (1 / (2 * M_PI)); /* Scale t to [0, 1] and
54 conical_get_scanline_narrow (pixman_iter_t *iter, const uint32_t *mask)
56 pixman_image_t *image = iter->image;
59 int width = iter->width;
60 uint32_t *buffer = iter->buffer;
62 gradient_t *gradient = (gradient_t *)image;
63 conical_gradient_t *conical = (conical_gradient_t *)image;
64 uint32_t *end = buffer + width;
65 pixman_gradient_walker_t walker;
66 pixman_bool_t affine = TRUE;
74 _pixman_gradient_walker_init (&walker, gradient, image->common.repeat);
76 if (image->common.transform)
80 /* reference point is the center of the pixel */
81 v.vector[0] = pixman_int_to_fixed (x) + pixman_fixed_1 / 2;
82 v.vector[1] = pixman_int_to_fixed (y) + pixman_fixed_1 / 2;
83 v.vector[2] = pixman_fixed_1;
85 if (!pixman_transform_point_3d (image->common.transform, &v))
88 cx = image->common.transform->matrix[0][0] / 65536.;
89 cy = image->common.transform->matrix[1][0] / 65536.;
90 cz = image->common.transform->matrix[2][0] / 65536.;
92 rx = v.vector[0] / 65536.;
93 ry = v.vector[1] / 65536.;
94 rz = v.vector[2] / 65536.;
97 image->common.transform->matrix[2][0] == 0 &&
98 v.vector[2] == pixman_fixed_1;
103 rx -= conical->center.x / 65536.;
104 ry -= conical->center.y / 65536.;
108 if (!mask || *mask++)
110 double t = coordinates_to_parameter (rx, ry, conical->angle);
112 *buffer = _pixman_gradient_walker_pixel (
113 &walker, (pixman_fixed_48_16_t)pixman_double_to_fixed (t));
128 if (!mask || *mask++)
142 x -= conical->center.x / 65536.;
143 y -= conical->center.y / 65536.;
145 t = coordinates_to_parameter (x, y, conical->angle);
147 *buffer = _pixman_gradient_walker_pixel (
148 &walker, (pixman_fixed_48_16_t)pixman_double_to_fixed (t));
164 conical_get_scanline_wide (pixman_iter_t *iter, const uint32_t *mask)
166 uint32_t *buffer = conical_get_scanline_narrow (iter, NULL);
168 pixman_expand_to_float (
169 (argb_t *)buffer, buffer, PIXMAN_a8r8g8b8, iter->width);
175 _pixman_conical_gradient_iter_init (pixman_image_t *image, pixman_iter_t *iter)
177 if (iter->iter_flags & ITER_NARROW)
178 iter->get_scanline = conical_get_scanline_narrow;
180 iter->get_scanline = conical_get_scanline_wide;
183 PIXMAN_EXPORT pixman_image_t *
184 pixman_image_create_conical_gradient (const pixman_point_fixed_t * center,
185 pixman_fixed_t angle,
186 const pixman_gradient_stop_t *stops,
189 pixman_image_t *image = _pixman_image_allocate ();
190 conical_gradient_t *conical;
195 conical = &image->conical;
197 if (!_pixman_init_gradient (&conical->common, stops, n_stops))
203 angle = MOD (angle, pixman_int_to_fixed (360));
205 image->type = CONICAL;
207 conical->center = *center;
208 conical->angle = (pixman_fixed_to_double (angle) / 180.0) * M_PI;