1 /* Conky, a system monitor, based on torsmo
3 * Any original torsmo code is licensed under the BSD license
5 * All code written since the fork of torsmo is licensed under the GPL
7 * Please see COPYING for details
9 * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
10 * Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
12 * All rights reserved.
14 * This program is free software: you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation, either version 3 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program. If not, see <http://www.gnu.org/licenses/>.
33 /* precalculated: 31/255, and 63/255 */
34 #define CONST_8_TO_5_BITS 0.12156862745098
35 #define CONST_8_TO_6_BITS 0.247058823529412
37 static short colour_depth = 0;
38 static long redmask, greenmask, bluemask;
40 static void set_up_gradient(void)
44 if (output_methods & TO_X) {
45 colour_depth = DisplayPlanes(display, screen);
51 if (colour_depth != 24 && colour_depth != 16) {
52 ERR("using non-standard colour depth, gradients may look like a "
59 for (i = (colour_depth / 3) - 1; i >= 0; i--) {
64 if (colour_depth % 3 == 1) {
65 greenmask |= 1 << (colour_depth / 3);
67 redmask = redmask << (2 * colour_depth / 3 + colour_depth % 3);
68 greenmask = greenmask << (colour_depth / 3);
71 /* adjust color values depending on color depth */
72 unsigned int adjust_colors(unsigned int color)
76 if (colour_depth == 0) {
79 if (colour_depth == 16) {
80 r = (color & 0xff0000) >> 16;
81 g = (color & 0xff00) >> 8;
83 color = (int) (r * CONST_8_TO_5_BITS) << 11;
84 color |= (int) (g * CONST_8_TO_6_BITS) << 5;
85 color |= (int) (b * CONST_8_TO_5_BITS);
90 /* this function returns the next colour between two colours for a gradient */
91 unsigned long do_gradient(unsigned long first_colour,
92 unsigned long last_colour)
95 int red1, green1, blue1; // first colour
96 int red2, green2, blue2; // second colour
97 int red3 = 0, green3 = 0, blue3 = 0; // difference
98 short redshift = (2 * colour_depth / 3 + colour_depth % 3);
99 short greenshift = (colour_depth / 3);
101 red1 = (first_colour & redmask) >> redshift;
102 green1 = (first_colour & greenmask) >> greenshift;
103 blue1 = first_colour & bluemask;
104 red2 = (last_colour & redmask) >> redshift;
105 green2 = (last_colour & greenmask) >> greenshift;
106 blue2 = last_colour & bluemask;
113 if (green1 > green2) {
116 if (green1 < green2) {
137 if (red1 > bluemask) {
140 if (green1 > bluemask) {
143 if (blue1 > bluemask) {
146 tmp_color = (red1 << redshift) | (green1 << greenshift) | blue1;
150 /* this function returns the max diff for a gradient */
151 unsigned long gradient_max(unsigned long first_colour,
152 unsigned long last_colour)
154 int red1, green1, blue1; // first colour
155 int red2, green2, blue2; // second colour
156 int red3 = 0, green3 = 0, blue3 = 0; // difference
157 long redshift, greenshift;
160 if (colour_depth == 0) {
163 redshift = (2 * colour_depth / 3 + colour_depth % 3);
164 greenshift = (colour_depth / 3);
166 red1 = (first_colour & redmask) >> redshift;
167 green1 = (first_colour & greenmask) >> greenshift;
168 blue1 = first_colour & bluemask;
169 red2 = (last_colour & redmask) >> redshift;
170 green2 = (last_colour & greenmask) >> greenshift;
171 blue2 = last_colour & bluemask;
172 red3 = abs(red1 - red2);
173 green3 = abs(green1 - green2);
174 blue3 = abs(blue1 - blue2);