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/>.
26 * vim: ts=4 sw=4 noet ai cindent syntax=c
35 /* precalculated: 31/255, and 63/255 */
36 #define CONST_8_TO_5_BITS 0.12156862745098
37 #define CONST_8_TO_6_BITS 0.247058823529412
39 static short colour_depth = 0;
40 static long redmask, greenmask, bluemask;
42 static void set_up_gradient(void)
46 if (output_methods & TO_X) {
47 colour_depth = DisplayPlanes(display, screen);
53 if (colour_depth != 24 && colour_depth != 16) {
54 ERR("using non-standard colour depth, gradients may look like a "
61 for (i = (colour_depth / 3) - 1; i >= 0; i--) {
66 if (colour_depth % 3 == 1) {
67 greenmask |= 1 << (colour_depth / 3);
69 redmask = redmask << (2 * colour_depth / 3 + colour_depth % 3);
70 greenmask = greenmask << (colour_depth / 3);
73 /* adjust colour values depending on colour depth */
74 unsigned int adjust_colours(unsigned int colour)
78 if (colour_depth == 0) {
81 if (colour_depth == 16) {
82 r = (colour & 0xff0000) >> 16;
83 g = (colour & 0xff00) >> 8;
85 colour = (int) (r * CONST_8_TO_5_BITS) << 11;
86 colour |= (int) (g * CONST_8_TO_6_BITS) << 5;
87 colour |= (int) (b * CONST_8_TO_5_BITS);
92 /* this function returns the next colour between two colours for a gradient */
93 unsigned long *do_gradient(int width, unsigned long first_colour, unsigned long last_colour)
95 int red1, green1, blue1; // first colour
96 int red2, green2, blue2; // last colour
97 int reddiff, greendiff, bluediff; // difference
98 short redshift = (2 * colour_depth / 3 + colour_depth % 3);
99 short greenshift = (colour_depth / 3);
100 unsigned long *colours = malloc(width * sizeof(unsigned long));
103 if (colour_depth == 0) {
106 red1 = (first_colour & redmask) >> redshift;
107 green1 = (first_colour & greenmask) >> greenshift;
108 blue1 = first_colour & bluemask;
109 red2 = (last_colour & redmask) >> redshift;
110 green2 = (last_colour & greenmask) >> greenshift;
111 blue2 = last_colour & bluemask;
112 reddiff = abs(red1 - red2);
113 greendiff = abs(green1 - green2);
114 bluediff = abs(blue1 - blue2);
116 #pragma omp parallel for schedule(dynamic,10) shared(colours)
117 #endif /* HAVE_OPENMP */
118 for (i = 0; i < width; i++) {
119 int red3 = 0, green3 = 0, blue3 = 0; // colour components
121 float factor = ((float)(i + 1) / width);
123 /* the '+ 0.5' bit rounds our floats to ints properly */
125 red3 = -(factor * reddiff) - 0.5;
126 } else if (red1 < red2) {
127 red3 = factor * reddiff + 0.5;
129 if (green1 >= green2) {
130 green3 = -(factor * greendiff) - 0.5;
131 } else if (green1 < green2) {
132 green3 = factor * greendiff + 0.5;
134 if (blue1 >= blue2) {
135 blue3 = -(factor * bluediff) - 0.5;
136 } else if (blue1 < blue2) {
137 blue3 = factor * bluediff + 0.5;
151 if (red3 > bluemask) {
154 if (green3 > bluemask) {
157 if (blue3 > bluemask) {
160 colours[i] = (red3 << redshift) | (green3 << greenshift) | blue3;