1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/cairo/libpixman/src/pixman-gradient-walker.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,172 @@
1.4 +/*
1.5 + *
1.6 + * Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
1.7 + * 2005 Lars Knoll & Zack Rusin, Trolltech
1.8 + *
1.9 + * Permission to use, copy, modify, distribute, and sell this software and its
1.10 + * documentation for any purpose is hereby granted without fee, provided that
1.11 + * the above copyright notice appear in all copies and that both that
1.12 + * copyright notice and this permission notice appear in supporting
1.13 + * documentation, and that the name of Keith Packard not be used in
1.14 + * advertising or publicity pertaining to distribution of the software without
1.15 + * specific, written prior permission. Keith Packard makes no
1.16 + * representations about the suitability of this software for any purpose. It
1.17 + * is provided "as is" without express or implied warranty.
1.18 + *
1.19 + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
1.20 + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
1.21 + * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
1.22 + * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
1.23 + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
1.24 + * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
1.25 + * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
1.26 + * SOFTWARE.
1.27 + */
1.28 +
1.29 +#ifdef HAVE_CONFIG_H
1.30 +#include <config.h>
1.31 +#endif
1.32 +#include "pixman-private.h"
1.33 +
1.34 +void
1.35 +_pixman_gradient_walker_init (pixman_gradient_walker_t *walker,
1.36 + gradient_t * gradient,
1.37 + pixman_repeat_t repeat)
1.38 +{
1.39 + walker->num_stops = gradient->n_stops;
1.40 + walker->stops = gradient->stops;
1.41 + walker->left_x = 0;
1.42 + walker->right_x = 0x10000;
1.43 + walker->stepper = 0;
1.44 + walker->left_ag = 0;
1.45 + walker->left_rb = 0;
1.46 + walker->right_ag = 0;
1.47 + walker->right_rb = 0;
1.48 + walker->repeat = repeat;
1.49 +
1.50 + walker->need_reset = TRUE;
1.51 +}
1.52 +
1.53 +static void
1.54 +gradient_walker_reset (pixman_gradient_walker_t *walker,
1.55 + pixman_fixed_48_16_t pos)
1.56 +{
1.57 + int32_t x, left_x, right_x;
1.58 + pixman_color_t *left_c, *right_c;
1.59 + int n, count = walker->num_stops;
1.60 + pixman_gradient_stop_t *stops = walker->stops;
1.61 +
1.62 + if (walker->repeat == PIXMAN_REPEAT_NORMAL)
1.63 + {
1.64 + x = (int32_t)pos & 0xffff;
1.65 + }
1.66 + else if (walker->repeat == PIXMAN_REPEAT_REFLECT)
1.67 + {
1.68 + x = (int32_t)pos & 0xffff;
1.69 + if ((int32_t)pos & 0x10000)
1.70 + x = 0x10000 - x;
1.71 + }
1.72 + else
1.73 + {
1.74 + x = pos;
1.75 + }
1.76 +
1.77 + for (n = 0; n < count; n++)
1.78 + {
1.79 + if (x < stops[n].x)
1.80 + break;
1.81 + }
1.82 +
1.83 + left_x = stops[n - 1].x;
1.84 + left_c = &stops[n - 1].color;
1.85 +
1.86 + right_x = stops[n].x;
1.87 + right_c = &stops[n].color;
1.88 +
1.89 + if (walker->repeat == PIXMAN_REPEAT_NORMAL)
1.90 + {
1.91 + left_x += (pos - x);
1.92 + right_x += (pos - x);
1.93 + }
1.94 + else if (walker->repeat == PIXMAN_REPEAT_REFLECT)
1.95 + {
1.96 + if ((int32_t)pos & 0x10000)
1.97 + {
1.98 + pixman_color_t *tmp_c;
1.99 + int32_t tmp_x;
1.100 +
1.101 + tmp_x = 0x10000 - right_x;
1.102 + right_x = 0x10000 - left_x;
1.103 + left_x = tmp_x;
1.104 +
1.105 + tmp_c = right_c;
1.106 + right_c = left_c;
1.107 + left_c = tmp_c;
1.108 +
1.109 + x = 0x10000 - x;
1.110 + }
1.111 + left_x += (pos - x);
1.112 + right_x += (pos - x);
1.113 + }
1.114 + else if (walker->repeat == PIXMAN_REPEAT_NONE)
1.115 + {
1.116 + if (n == 0)
1.117 + right_c = left_c;
1.118 + else if (n == count)
1.119 + left_c = right_c;
1.120 + }
1.121 +
1.122 + walker->left_x = left_x;
1.123 + walker->right_x = right_x;
1.124 + walker->left_ag = ((left_c->alpha >> 8) << 16) | (left_c->green >> 8);
1.125 + walker->left_rb = ((left_c->red & 0xff00) << 8) | (left_c->blue >> 8);
1.126 + walker->right_ag = ((right_c->alpha >> 8) << 16) | (right_c->green >> 8);
1.127 + walker->right_rb = ((right_c->red & 0xff00) << 8) | (right_c->blue >> 8);
1.128 +
1.129 + if (walker->left_x == walker->right_x ||
1.130 + (walker->left_ag == walker->right_ag &&
1.131 + walker->left_rb == walker->right_rb))
1.132 + {
1.133 + walker->stepper = 0;
1.134 + }
1.135 + else
1.136 + {
1.137 + int32_t width = right_x - left_x;
1.138 + walker->stepper = ((1 << 24) + width / 2) / width;
1.139 + }
1.140 +
1.141 + walker->need_reset = FALSE;
1.142 +}
1.143 +
1.144 +uint32_t
1.145 +_pixman_gradient_walker_pixel (pixman_gradient_walker_t *walker,
1.146 + pixman_fixed_48_16_t x)
1.147 +{
1.148 + int dist, idist;
1.149 + uint32_t t1, t2, a, color;
1.150 +
1.151 + if (walker->need_reset || x < walker->left_x || x >= walker->right_x)
1.152 + gradient_walker_reset (walker, x);
1.153 +
1.154 + dist = ((int)(x - walker->left_x) * walker->stepper) >> 16;
1.155 + idist = 256 - dist;
1.156 +
1.157 + /* combined INTERPOLATE and premultiply */
1.158 + t1 = walker->left_rb * idist + walker->right_rb * dist;
1.159 + t1 = (t1 >> 8) & 0xff00ff;
1.160 +
1.161 + t2 = walker->left_ag * idist + walker->right_ag * dist;
1.162 + t2 &= 0xff00ff00;
1.163 +
1.164 + color = t2 & 0xff000000;
1.165 + a = t2 >> 24;
1.166 +
1.167 + t1 = t1 * a + 0x800080;
1.168 + t1 = (t1 + ((t1 >> 8) & 0xff00ff)) >> 8;
1.169 +
1.170 + t2 = (t2 >> 8) * a + 0x800080;
1.171 + t2 = (t2 + ((t2 >> 8) & 0xff00ff));
1.172 +
1.173 + return (color | (t1 & 0xff00ff) | (t2 & 0xff00));
1.174 +}
1.175 +
