💿🐜 Antkeeper source code
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89 lines
2.1 KiB
89 lines
2.1 KiB
/*
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* Copyright (C) 2021 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_XYY_HPP
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#define ANTKEEPER_COLOR_XYY_HPP
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#include "math/math.hpp"
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namespace color {
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/// Functions which operate in the CIE xyY colorspace.
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namespace xyy {
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/**
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* Returns the luminance of a CIE xyY color.
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*
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* @param x CIE xyY color.
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* @return return Luminance of @p x.
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*/
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template <class T>
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T luminance(const math::vector3<T>& x);
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/**
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* Transforms a CIE xyY color into the CIE 1960 UCS colorspace.
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*
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* @param x CIE xyY color.
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* @return CIE 1960 UCS color.
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*/
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template <class T>
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math::vector2<T> to_ucs(const math::vector3<T>& x);
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/**
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* Transforms a CIE xyY color into the CIE XYZ colorspace.
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*
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* @param x CIE xyY color.
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* @return CIE XYZ color.
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*/
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template <class T>
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math::vector3<T> to_xyz(const math::vector3<T>& x);
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template <class T>
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inline T luminance(const math::vector3<T>& x)
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{
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return x[2];
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}
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template <class T>
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math::vector2<T> to_ucs(const math::vector3<T>& x)
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{
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const T inverse_denom = T(1.0) / (T(-2.0) * x[0] + T(12.0) * x[1] + T(3.0));
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return math::vector2<T>
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{
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(T(4.0) * x[0]) * inverse_denom,
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(T(6.0) * x[1]) * inverse_denom
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};
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}
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template <class T>
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math::vector3<T> to_xyz(const math::vector3<T>& x)
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{
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return math::vector3<T>
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{
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(x[0] * x[2]) / x[1],
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x[2],
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((T(1.0) - x[0] - x[1]) * x[2]) / x[1]
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};
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}
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} // namespace xyy
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} // namespace color
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#endif // ANTKEEPER_COLOR_XYY_HPP
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