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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_ACESCG_HPP
- #define ANTKEEPER_COLOR_ACESCG_HPP
-
- #include "math/math.hpp"
-
- namespace color {
-
- /// Functions which operate in the ACEScg colorspace.
- namespace acescg {
-
- /// CIE chromaticity coordinates of the ACEScg white point (~D60).
- template <class T>
- constexpr math::vector2<T> whitepoint = {0.32168, 0.33767};
-
- /**
- * Calculates the luminance of an ACEScg color.
- *
- * @param x ACEScg color.
- * @return return Luminance of @p x.
- */
- template <class T>
- T luminance(const math::vector3<T>& x);
-
- /**
- * Transforms an ACEScg color into the linear sRGB colorspace using the Bradford chromatic adaption transform.
- *
- * @param x ACEScg color.
- * @return return Linear sRGB color.
- *
- * @see https://www.colour-science.org/apps/
- */
- template <class T>
- math::vector3<T> to_srgb(const math::vector3<T>& x);
-
- /**
- * Transforms an ACEScg color into the CIE XYZ colorspace.
- *
- * @param x ACEScg color.
- * @return return CIE XYZ color.
- */
- template <class T>
- math::vector3<T> to_xyz(const math::vector3<T>& x);
-
- template <class T>
- T luminance(const math::vector3<T>& x)
- {
- static const math::vector3<T> luma = {0.272228716780914, 0.674081765811148, 0.053689517407937};
- return math::dot(x, luma);
- }
-
- template <class T>
- math::vector3<T> to_srgb(const math::vector3<T>& x)
- {
- static const math::matrix3<T> acescg_to_srgb
- {{
- { 1.704858676289160, -0.130076824208823, -0.023964072927574},
- {-0.621716021885330, 1.140735774822504, -0.128975508299318},
- {-0.083299371729058, -0.010559801677511, 1.153014018916862}
- }};
-
- return acescg_to_srgb * x;
- }
-
- template <class T>
- math::vector3<T> to_xyz(const math::vector3<T>& x)
- {
- static const math::matrix3<T> acescg_to_xyz
- {{
- {0.662454181108505, 0.272228716780914, -0.005574649490394},
- {0.134004206456433, 0.674081765811148, 0.004060733528983},
- {0.156187687004908, 0.053689517407937, 1.010339100312997}
- }};
-
- return acescg_to_xyz * x;
- }
-
- } // namespace acescg
- } // namespace color
-
- #endif // ANTKEEPER_COLOR_ACESCG_HPP
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