💿🐜 Antkeeper source code
https://antkeeper.com
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90 lines
2.2 KiB
90 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 "color/rgb.hpp"
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#include "color/illuminant.hpp"
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#include "math/vector.hpp"
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#include <cmath>
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namespace color {
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/**
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* sRGB electro-optical transfer function (EOTF), also known as the sRGB decoding function.
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*
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* @param v sRGB electrical signal (gamma-encoded sRGB).
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*
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* @return Corresponding luminance of the signal (linear sRGB).
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*/
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template <class T>
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math::vector3<T> srgb_eotf(const math::vector3<T>& v)
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{
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auto f = [](T x) -> T
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{
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return x < T{0.04045} ? x / T{12.92} : std::pow((x + T{0.055}) / T{1.055}, T{2.4});
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};
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return math::vector3<T>
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{
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f(v[0]),
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f(v[1]),
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f(v[2])
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};
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}
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/**
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* sRGB inverse electro-optical transfer function (EOTF), also known as the sRGB encoding function.
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*
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* @param l sRGB luminance (linear sRGB).
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*
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* @return Corresponding electrical signal (gamma-encoded sRGB).
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*/
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template <class T>
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math::vector3<T> srgb_inverse_eotf(const math::vector3<T>& l)
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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} ? x * T{12.92} : std::pow(x, T{1} / T{2.4}) * T{1.055} - T{0.055};
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};
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return math::vector3<T>
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{
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f(l[0]),
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f(l[1]),
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f(l[2])
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};
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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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color::illuminant::deg2::d65<T>,
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&srgb_eotf<T>,
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&srgb_inverse_eotf
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);
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} // namespace color
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#endif // ANTKEEPER_COLOR_SRGB_HPP
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