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