💿🐜 Antkeeper source code
https://antkeeper.com
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89 lines
2.2 KiB
89 lines
2.2 KiB
/*
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* Copyright (C) 2023 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code 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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* Antkeeper source code 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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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_COLOR_SRGB_HPP
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#define ANTKEEPER_COLOR_SRGB_HPP
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#include <engine/color/rgb.hpp>
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#include <engine/color/illuminants.hpp>
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#include <engine/math/vector.hpp>
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#include <cmath>
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namespace color {
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/// @name sRGB color space
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/// @{
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/**
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* sRGB opto-electronic transfer function (OETF). Maps a linear sRGB color to a non-linear sRGB signal.
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*
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* @param x Linear sRGB color.
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*
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* @return Non-linear sRGB signal.
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*
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* @see IEC 61966-2-1:1999
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*/
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template <class T>
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[[nodiscard]] math::vec3<T> srgb_oetf(const math::vec3<T>& x)
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{
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auto f = [](T x) -> T
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{
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return x > T{0.0031308} ? std::pow(x, T{1.0 / 2.4}) * T{1.055} - T{0.055} : x * T{12.92};
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};
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return {f(x[0]), f(x[1]), f(x[2])};
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}
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/**
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* sRGB electro-optical transfer function (EOTF). Maps a non-linear sRGB signal to a linear sRGB color.
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*
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* @param x Non-linear sRGB signal.
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*
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* @return Linear sRGB color.
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*
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* @see IEC 61966-2-1:1999
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*/
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template <class T>
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[[nodiscard]] math::vec3<T> srgb_eotf(const math::vec3<T>& x)
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{
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auto f = [](T x) -> T
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{
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return x > T{0.0031308 * 12.92} ? std::pow((x + T{0.055}) / T{1.055}, T{2.4}) : x / T{12.92};
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};
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return {f(x[0]), f(x[1]), f(x[2])};
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}
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/// sRGB color space.
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template <class T>
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constexpr rgb_color_space<T> srgb
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(
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{T{0.64}, T{0.33}},
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{T{0.30}, T{0.60}},
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{T{0.15}, T{0.06}},
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deg2_d65<T>,
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&srgb_eotf<T>,
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&srgb_oetf<T>
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);
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/// @}
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} // namespace color
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#endif // ANTKEEPER_COLOR_SRGB_HPP
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