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- // SuperTux
- // Copyright (C) 2006 Matthias Braun <matze@braunis.de>
- //
- // This program is free software: you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // This program is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- //
- // You should have received a copy of the GNU General Public License
- // along with this program. If not, see <http://www.gnu.org/licenses/>.
- #include "video/color.hpp"
- #include <assert.h>
- const Color Color::BLACK(0.0, 0.0, 0.0);
- const Color Color::RED(1.0, 0.0, 0.0);
- const Color Color::GREEN(0.0, 1.0, 0.0);
- const Color Color::BLUE(0.0, 0.0, 1.0);
- const Color Color::CYAN(0.0, 1.0, 1.0);
- const Color Color::MAGENTA(1.0, 0.0, 1.0);
- const Color Color::YELLOW(1.0, 1.0, 0.0);
- const Color Color::WHITE(1.0, 1.0, 1.0);
- Color::Color() :
- red(0),
- green(0),
- blue(0),
- alpha(1.0f)
- {}
- Color::Color(float red_, float green_, float blue_, float alpha_) :
- red(red_),
- green(green_),
- blue(blue_),
- alpha(alpha_)
- {
- assert(0 <= red && red <= 1.0f);
- assert(0 <= green && green <= 1.0f);
- assert(0 <= blue && blue <= 1.0f);
- }
- Color::Color(const std::vector<float>& vals) :
- red(),
- green(),
- blue(),
- alpha()
- {
- if (vals.size() < 3) {
- red = 0;
- green = 0;
- blue = 0;
- alpha = 0;
- return;
- }
- red = vals[0];
- green = vals[1];
- blue = vals[2];
- if (vals.size() > 3)
- alpha = vals[3];
- else
- alpha = 1.0;
- assert(0 <= red && red <= 1.0f);
- assert(0 <= green && green <= 1.0f);
- assert(0 <= blue && blue <= 1.0f);
- }
- bool
- Color::operator==(const Color& other) const
- {
- return red == other.red && green == other.green && blue == other.blue
- && alpha == other.alpha;
- }
- bool
- Color::operator!=(const Color& other) const
- {
- return !(operator==(other));
- }
- float
- Color::greyscale() const
- {
- return red * 0.30f + green * 0.59f + blue * 0.11f;
- }
- Color
- Color::multiply_linearly(float v) const
- {
- // For the approximate sRGB conversion, it is sufficient to apply the exponent
- // to v.
- v = add_gamma(v);
- return Color(red * v, green * v, blue * v, alpha);
- }
- bool
- Color::operator < (const Color& other) const
- {
- return greyscale() < other.greyscale();
- }
- std::vector<float>
- Color::toVector()
- {
- std::vector<float> result;
- result.clear();
- result.push_back(red);
- result.push_back(green);
- result.push_back(blue);
- result.push_back(alpha);
- return result;
- }
- /* EOF */
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