💿🐜 Antkeeper source code
https://antkeeper.com
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80 lines
2.2 KiB
80 lines
2.2 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_ACES_HPP
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#define ANTKEEPER_ACES_HPP
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#include "math/vector-type.hpp"
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/**
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* Transforms a linear sRGB color into the ACEScg colorspace, using the Bradford chromatic adaption transform.
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*
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* @param x Linear sRGB color.
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* @return Linear ACEScg color.
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*
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* @see https://www.colour-science.org/apps/
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*/
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template <class T>
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math::vector<T, 3> srgb_to_acescg(const math::vector<T, 3>& x)
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{
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static const math::matrix<T, 3, 3> matrix
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{{
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{0.6131324224, 0.0701243808, 0.0205876575},
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{0.3395380158, 0.9163940113, 0.1095745716},
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{0.0474166960, 0.0134515240, 0.8697854040}
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}};
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return matrix * x;
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}
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/**
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* Transforms an ACEScg color into the linear sRGB colorspace, using the Bradford chromatic adaption transform.
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*
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* @param x Linear ACEScg color.
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* @param return Linear sRGB color.
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*
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* @see https://www.colour-science.org/apps/
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*/
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template <class T>
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math::vector<T, 3> acescg_to_srgb(const math::vector<T, 3>& x)
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{
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static const math::matrix<T, 3, 3> matrix
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{{
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{ 1.7048586763, -0.1300768242, -0.0239640729},
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{-0.6217160219, 1.1407357748, -0.1289755083},
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{-0.0832993717, -0.0105598017, 1.1530140189}
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}};
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return matrix * x;
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}
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/**
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* Calculates the luminance of an ACEScg color.
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*
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* @param x Linear ACEScg color.
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* @param return Luminance of @p x.
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*/
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template <class T>
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T acescg_to_luminance(const math::vector<T, 3>& x)
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{
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static const math::vector<T, 3> luma = {0.2722287168, 0.6740817658, 0.0536895174};
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return math::dot(x, luma);
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}
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#endif // ANTKEEPER_ACES_HPP
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