/*
* Copyright (C) 2023 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 .
*/
#ifndef ANTKEEPER_COLOR_ACES_HPP
#define ANTKEEPER_COLOR_ACES_HPP
#include
#include
#include
namespace color {
/// ACES color spaces.
namespace aces {
/// CIE xy chromaticity coordinates of the ACES white point (~D60).
template
constexpr math::vec2 white_point = {T{0.32168}, T{0.33767}};
/// ACES AP0 color space.
template
constexpr rgb::color_space ap0
(
{T{0.7347}, T{ 0.2653}},
{T{0.0000}, T{ 1.0000}},
{T{0.0001}, T{-0.0770}},
aces::white_point,
nullptr,
nullptr
);
/// ACES AP1 color space.
template
constexpr rgb::color_space ap1
(
{T{0.713}, T{0.293}},
{T{0.165}, T{0.830}},
{T{0.128}, T{0.044}},
aces::white_point,
nullptr,
nullptr
);
/**
* Constructs a saturation adjustment matrix.
*
* @param s Saturation adjustment factor.
* @param to_y Color space to CIE XYZ luminance vector.
*
* @return Saturation adjustment matrix.
*/
template
[[nodiscard]] constexpr math::mat3 adjust_saturation(T s, const math::vec3& to_y) noexcept
{
const math::vec3 v = to_y * (T{1} - s);
return math::mat3
{
v[0] + s, v[0], v[0],
v[1], v[1] + s, v[1],
v[2], v[2], v[2] + s
};
}
/// ACES AP1 RRT saturation adjustment matrix.
template
constexpr math::mat3 ap1_rrt_sat = aces::adjust_saturation(T{0.96}, ap1.to_y);
/// ACES AP1 ODT saturation adjustment matrix.
template
constexpr math::mat3 ap1_odt_sat = aces::adjust_saturation(T{0.93}, ap1.to_y);
} // namespace aces
} // namespace color
#endif // ANTKEEPER_COLOR_ACES_HPP