Source/WebCore/platform/graphics/ColorTypes.h

/*
 * Copyright (C) 2020 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "ColorComponents.h"

namespace WebCore {

template<typename T> struct SRGBA {
    T red;
    T green;
    T blue;
    T alpha;
};

template<typename T> constexpr ColorComponents<T> asColorComponents(const SRGBA<T>& c)
{
    return { c.red, c.green, c.blue, c.alpha };
}

template<typename T> constexpr SRGBA<T> asSRGBA(const ColorComponents<T>& c)
{
    return { c[0], c[1], c[2], c[3] };
}

template<typename T, typename Functor> void forEachNonAlphaComponent(SRGBA<T>& color, Functor&& f)
{
    color.red = f(color.red);
    color.green = f(color.green);
    color.blue = f(color.blue);
}

template<typename T> struct LinearSRGBA {
    T red;
    T green;
    T blue;
    T alpha;
};

template<typename T> constexpr ColorComponents<T> asColorComponents(const LinearSRGBA<T>& c)
{
    return { c.red, c.green, c.blue, c.alpha };
}

template<typename T> constexpr LinearSRGBA<T> asLinearSRGBA(const ColorComponents<T>& c)
{
    return { c[0], c[1], c[2], c[3] };
}

template<typename T> struct DisplayP3 {
    T red;
    T green;
    T blue;
    T alpha;
};

template<typename T> constexpr ColorComponents<T> asColorComponents(const DisplayP3<T>& c)
{
    return { c.red, c.green, c.blue, c.alpha };
}

template<typename T> constexpr DisplayP3<T> asDisplayP3(const ColorComponents<T>& c)
{
    return { c[0], c[1], c[2], c[3] };
}

template<typename T> struct LinearDisplayP3 {
    T red;
    T green;
    T blue;
    T alpha;
};

template<typename T> constexpr ColorComponents<T> asColorComponents(const LinearDisplayP3<T>& c)
{
    return { c.red, c.green, c.blue, c.alpha };
}

template<typename T> constexpr LinearDisplayP3<T> asLinearDisplayP3(const ColorComponents<T>& c)
{
    return { c[0], c[1], c[2], c[3] };
}

template<typename T> struct HSLA {
    T hue;
    T saturation;
    T lightness;
    T alpha;
};

template<typename T> constexpr ColorComponents<T> asColorComponents(const HSLA<T>& c)
{
    return { c.hue, c.saturation, c.lightness, c.alpha };
}

template<typename T> constexpr HSLA<T> asHSLA(const ColorComponents<T>& c)
{
    return { c[0], c[1], c[2], c[3] };
}

template<typename T> struct XYZA {
    T x;
    T y;
    T z;
    T alpha;
};

template<typename T> constexpr ColorComponents<T> asColorComponents(const XYZA<T>& c)
{
    return { c.x, c.y, c.z, c.alpha };
}

template<typename T> constexpr XYZA<T> asXYZA(const ColorComponents<T>& c)
{
    return { c[0], c[1], c[2], c[3] };
}

} // namespace WebCore