💿🐜 Antkeeper source code
https://antkeeper.com
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92 lines
2.4 KiB
92 lines
2.4 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_ACES_HPP
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#define ANTKEEPER_COLOR_ACES_HPP
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#include "color/rgb.hpp"
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#include "math/matrix.hpp"
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#include "math/vector.hpp"
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namespace color {
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/// ACES color spaces.
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namespace aces {
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/// CIE xy chromaticity coordinates of the ACES white point (~D60).
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template <class T>
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constexpr math::vector2<T> white_point = {T{0.32168}, T{0.33767}};
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/// ACES AP0 color space.
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template <class T>
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constexpr rgb::color_space<T> ap0
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(
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{T{0.7347}, T{ 0.2653}},
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{T{0.0000}, T{ 1.0000}},
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{T{0.0001}, T{-0.0770}},
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aces::white_point<T>,
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nullptr,
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nullptr
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);
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/// ACES AP1 color space.
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template <class T>
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constexpr rgb::color_space<T> ap1
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(
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{T{0.713}, T{0.293}},
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{T{0.165}, T{0.830}},
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{T{0.128}, T{0.044}},
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aces::white_point<T>,
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nullptr,
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nullptr
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);
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/**
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* Constructs a saturation adjustment matrix.
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*
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* @param s Saturation adjustment factor.
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* @param to_y Color space to CIE XYZ luminance vector.
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*
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* @return Saturation adjustment matrix.
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*/
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template <class T>
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constexpr math::matrix<T, 3, 3> adjust_saturation(T s, const math::vector3<T>& to_y)
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{
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const math::vector3<T> v = to_y * (T{1} - s);
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return math::matrix<T, 3, 3>
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{
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v[0] + s, v[0], v[0],
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v[1], v[1] + s, v[1],
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v[2], v[2], v[2] + s
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};
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}
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/// ACES AP1 RRT saturation adjustment matrix.
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template <class T>
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constexpr math::matrix<T, 3, 3> ap1_rrt_sat = aces::adjust_saturation(T{0.96}, ap1<T>.to_y);
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/// ACES AP1 ODT saturation adjustment matrix.
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template <class T>
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constexpr math::matrix<T, 3, 3> ap1_odt_sat = aces::adjust_saturation(T{0.93}, ap1<T>.to_y);
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} // namespace aces
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} // namespace color
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#endif // ANTKEEPER_COLOR_ACES_HPP
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