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* Copyright © 2000 SuSE, Inc.
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* Copyright © 2007 Red Hat, Inc.
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* Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
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* 2005 Lars Knoll & Zack Rusin, Trolltech
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Keith Packard not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Keith Packard makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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* THE COPYRIGHT HOLDERS DISCLAIM 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 THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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#include "pixman-private.h"
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static force_inline double
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coordinates_to_parameter (double x, double y, double angle)
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t = atan2 (y, x) + angle;
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return 1 - t * (1 / (2 * M_PI)); /* Scale t to [0, 1] and
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conical_get_scanline_narrow (pixman_iter_t *iter, const uint32_t *mask)
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pixman_image_t *image = iter->image;
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int width = iter->width;
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uint32_t *buffer = iter->buffer;
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gradient_t *gradient = (gradient_t *)image;
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conical_gradient_t *conical = (conical_gradient_t *)image;
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uint32_t *end = buffer + width;
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pixman_gradient_walker_t walker;
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pixman_bool_t affine = TRUE;
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_pixman_gradient_walker_init (&walker, gradient, image->common.repeat);
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if (image->common.transform)
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/* reference point is the center of the pixel */
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v.vector[0] = pixman_int_to_fixed (x) + pixman_fixed_1 / 2;
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v.vector[1] = pixman_int_to_fixed (y) + pixman_fixed_1 / 2;
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v.vector[2] = pixman_fixed_1;
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if (!pixman_transform_point_3d (image->common.transform, &v))
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cx = image->common.transform->matrix[0][0] / 65536.;
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cy = image->common.transform->matrix[1][0] / 65536.;
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cz = image->common.transform->matrix[2][0] / 65536.;
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rx = v.vector[0] / 65536.;
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ry = v.vector[1] / 65536.;
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rz = v.vector[2] / 65536.;
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image->common.transform->matrix[2][0] == 0 &&
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v.vector[2] == pixman_fixed_1;
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rx -= conical->center.x / 65536.;
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ry -= conical->center.y / 65536.;
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if (!mask || *mask++)
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double t = coordinates_to_parameter (rx, ry, conical->angle);
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*buffer = _pixman_gradient_walker_pixel (
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&walker, (pixman_fixed_48_16_t)pixman_double_to_fixed (t));
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if (!mask || *mask++)
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x -= conical->center.x / 65536.;
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y -= conical->center.y / 65536.;
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t = coordinates_to_parameter (x, y, conical->angle);
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*buffer = _pixman_gradient_walker_pixel (
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&walker, (pixman_fixed_48_16_t)pixman_double_to_fixed (t));
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conical_get_scanline_wide (pixman_iter_t *iter, const uint32_t *mask)
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uint32_t *buffer = conical_get_scanline_narrow (iter, NULL);
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pixman_expand_to_float (
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(argb_t *)buffer, buffer, PIXMAN_a8r8g8b8, iter->width);
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_pixman_conical_gradient_iter_init (pixman_image_t *image, pixman_iter_t *iter)
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if (iter->iter_flags & ITER_NARROW)
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iter->get_scanline = conical_get_scanline_narrow;
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iter->get_scanline = conical_get_scanline_wide;
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PIXMAN_EXPORT pixman_image_t *
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pixman_image_create_conical_gradient (const pixman_point_fixed_t * center,
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pixman_fixed_t angle,
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const pixman_gradient_stop_t *stops,
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pixman_image_t *image = _pixman_image_allocate ();
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conical_gradient_t *conical;
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conical = &image->conical;
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if (!_pixman_init_gradient (&conical->common, stops, n_stops))
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angle = MOD (angle, pixman_int_to_fixed (360));
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image->type = CONICAL;
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conical->center = *center;
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conical->angle = (pixman_fixed_to_double (angle) / 180.0) * M_PI;