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- /*
- * Copyright (C) 2021 Christopher J. Howard
- *
- * This file is part of Antkeeper source code.
- *
- * Antkeeper source code 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.
- *
- * Antkeeper source code 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 Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #ifndef ANTKEEPER_COLOR_UCS_HPP
- #define ANTKEEPER_COLOR_UCS_HPP
-
- #include "math/math.hpp"
-
- namespace color {
-
- /// Functions which operate in the CIE 1960 UCS colorspace.
- namespace ucs {
-
- /**
- * Transforms CIE 1960 UCS chromaticity coordinates into the CIE xyY colorspace.
- *
- * @param uv CIE 1960 UCS chromaticity coordinates.
- * @param luminance Luminance or `Y` value of the resulting xyY color.
- * @return CIE xyY color.
- */
- template <class T>
- math::vector3<T> to_xyy(const math::vector2<T>& uv, T luminance = T(1.0));
-
- template <class T>
- math::vector3<T> to_xyy(const math::vector2<T>& uv, T luminance)
- {
- const T inverse_denom = T(1.0) / (T(2.0) * uv[0] - T(8.0) * uv[1] + T(4.0));
-
- return math::vector3<T>
- {
- (T(3.0) * uv[0]) * inverse_denom,
- (T(2.0) * uv[1]) * inverse_denom,
- luminance
- };
- }
-
- } // namespace ucs
- } // namespace color
-
- #endif // ANTKEEPER_COLOR_UCS_HPP
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