1 /* -*- mode: c; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*-
3 * Conky, a system monitor, based on torsmo
5 * Any original torsmo code is licensed under the BSD license
7 * All code written since the fork of torsmo is licensed under the GPL
9 * Please see COPYING for details
11 * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
12 * Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
14 * All rights reserved.
16 * This program is free software: you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation, either version 3 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program. If not, see <http://www.gnu.org/licenses/>.
28 * vim: ts=4 sw=4 noet ai cindent syntax=c
37 /* precalculated: 31/255, and 63/255 */
38 #define CONST_8_TO_5_BITS 0.12156862745098
39 #define CONST_8_TO_6_BITS 0.247058823529412
41 static short colour_depth = 0;
42 static long redmask, greenmask, bluemask;
44 static void set_up_gradient(void)
48 if (output_methods & TO_X) {
49 colour_depth = DisplayPlanes(display, screen);
55 if (colour_depth != 24 && colour_depth != 16) {
56 NORM_ERR("using non-standard colour depth, gradients may look like a "
63 for (i = (colour_depth / 3) - 1; i >= 0; i--) {
68 if (colour_depth % 3 == 1) {
69 greenmask |= 1 << (colour_depth / 3);
71 redmask = redmask << (2 * colour_depth / 3 + colour_depth % 3);
72 greenmask = greenmask << (colour_depth / 3);
75 /* adjust colour values depending on colour depth */
76 unsigned int adjust_colours(unsigned int colour)
80 if (colour_depth == 0) {
83 if (colour_depth == 16) {
84 r = (colour & 0xff0000) >> 16;
85 g = (colour & 0xff00) >> 8;
87 colour = (int) (r * CONST_8_TO_5_BITS) << 11;
88 colour |= (int) (g * CONST_8_TO_6_BITS) << 5;
89 colour |= (int) (b * CONST_8_TO_5_BITS);
94 /* this function returns the next colour between two colours for a gradient */
95 unsigned long *do_gradient(int width, unsigned long first_colour, unsigned long last_colour)
97 int red1, green1, blue1; // first colour
98 int red2, green2, blue2; // last colour
99 int reddiff, greendiff, bluediff; // difference
100 short redshift = (2 * colour_depth / 3 + colour_depth % 3);
101 short greenshift = (colour_depth / 3);
102 unsigned long *colours = malloc(width * sizeof(unsigned long));
105 if (colour_depth == 0) {
108 red1 = (first_colour & redmask) >> redshift;
109 green1 = (first_colour & greenmask) >> greenshift;
110 blue1 = first_colour & bluemask;
111 red2 = (last_colour & redmask) >> redshift;
112 green2 = (last_colour & greenmask) >> greenshift;
113 blue2 = last_colour & bluemask;
114 reddiff = abs(red1 - red2);
115 greendiff = abs(green1 - green2);
116 bluediff = abs(blue1 - blue2);
118 #pragma omp parallel for schedule(dynamic,10) shared(colours)
119 #endif /* HAVE_OPENMP */
120 for (i = 0; i < width; i++) {
121 int red3 = 0, green3 = 0, blue3 = 0; // colour components
123 float factor = ((float)(i + 1) / width);
125 /* the '+ 0.5' bit rounds our floats to ints properly */
127 red3 = -(factor * reddiff) - 0.5;
128 } else if (red1 < red2) {
129 red3 = factor * reddiff + 0.5;
131 if (green1 >= green2) {
132 green3 = -(factor * greendiff) - 0.5;
133 } else if (green1 < green2) {
134 green3 = factor * greendiff + 0.5;
136 if (blue1 >= blue2) {
137 blue3 = -(factor * bluediff) - 0.5;
138 } else if (blue1 < blue2) {
139 blue3 = factor * bluediff + 0.5;
153 if (red3 > bluemask) {
156 if (green3 > bluemask) {
159 if (blue3 > bluemask) {
162 colours[i] = (red3 << redshift) | (green3 << greenshift) | blue3;