119 lines
3.3 KiB
C++
119 lines
3.3 KiB
C++
/*
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*
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* Conky, a system monitor, based on torsmo
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*
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* Any original torsmo code is licensed under the BSD license
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*
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* All code written since the fork of torsmo is licensed under the GPL
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*
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* Please see COPYING for details
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*
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* Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
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* Copyright (c) 2005-2021 Brenden Matthews, Philip Kovacs, et. al.
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* (see AUTHORS)
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* All rights reserved.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#pragma once
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#include <config.h>
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#include <cassert>
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#include <climits>
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#include <memory>
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#include <string>
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#include <unordered_map>
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#ifdef BUILD_X11
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#include "x11.h"
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#endif /* BUILD_X11 */
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struct Colour {
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uint8_t red;
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uint8_t green;
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uint8_t blue;
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uint8_t alpha;
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public:
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// Compare two instances.
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bool operator==(const Colour &c) const {
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return c.red == red && c.green == green && c.blue == blue &&
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c.alpha == alpha;
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}
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// Express the color as a 32-bit ARGB integer (alpha in MSB).
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uint32_t to_argb32(void) const {
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uint32_t out;
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out = alpha << 24 | red << 16 | green << 8 | blue;
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return out;
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}
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// Construct from a 32-bit ARGB integer (alpha in MSB).
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static Colour from_argb32(uint32_t argb);
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#ifdef BUILD_X11
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class Hash {
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public:
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size_t operator()(const Colour &c) const { return c.to_argb32(); }
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};
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static std::unordered_map<Colour, unsigned long, Hash> x11_pixels;
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unsigned long to_x11_color(Display *display, int screen,
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bool premultiply = false) {
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if (display == nullptr) {
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/* cannot work if display is not open */
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return 0;
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}
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unsigned long pixel;
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/* Either get a cached X11 pixel or allocate one */
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if (auto pixel_iter = x11_pixels.find(*this);
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pixel_iter != x11_pixels.end()) {
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pixel = pixel_iter->second;
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} else {
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XColor xcolor{};
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xcolor.red = red * 257;
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xcolor.green = green * 257;
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xcolor.blue = blue * 257;
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if (XAllocColor(display, DefaultColormap(display, screen), &xcolor) ==
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0) {
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// NORM_ERR("can't allocate X color");
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return 0;
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}
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/* Save pixel value in the cache to avoid reallocating it */
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x11_pixels[*this] = xcolor.pixel;
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pixel = static_cast<unsigned long>(xcolor.pixel);
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}
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pixel &= 0xffffff;
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#ifdef BUILD_ARGB
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if (have_argb_visual) {
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if (premultiply)
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pixel = (red * alpha / 255) << 16 | (green * alpha / 255) << 8 |
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(blue * alpha / 255);
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pixel |= ((unsigned long)alpha << 24);
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}
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#endif /* BUILD_ARGB */
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return pixel;
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}
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#endif /* BUILD_X11 */
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};
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extern Colour error_colour;
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Colour parse_color(const std::string &colour);
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// XXX: when everyone uses C++ strings, remove this C version
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Colour parse_color(const char *);
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