💿🐜 Antkeeper source code
https://antkeeper.com
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47 lines
1.4 KiB
47 lines
1.4 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_UCS_HPP
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#define ANTKEEPER_COLOR_UCS_HPP
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#include "math/vector.hpp"
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namespace color {
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/// CIE 1960 UCS color space.
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namespace ucs {
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/**
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* Transforms CIE 1960 UCS chromaticity coordinates into the CIE xyY colorspace.
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*
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* @param uv CIE 1960 UCS chromaticity coordinates.
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* @param y Luminance or `Y` value of the resulting xyY color.
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* @return CIE xyY color.
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*/
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template <class T>
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constexpr math::vector3<T> to_xyy(const math::vector2<T>& uv, T y = T{1})
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{
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const T d = T{1} / (T{2} * uv[0] - T{8} * uv[1] + T{4});
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return math::vector3<T>{(T{3} * uv[0]) * d, (T{2} * uv[1]) * d, y};
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}
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} // namespace ucs
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} // namespace color
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#endif // ANTKEEPER_COLOR_UCS_HPP
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