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using System;
namespace Colourful.Implementation.RGB
{
/// <summary>
/// sRGB companding
/// </summary>
/// <remarks>
/// For more info see:
/// http://www.brucelindbloom.com/index.html?Eqn_RGB_to_XYZ.html
/// http://www.brucelindbloom.com/index.html?Eqn_XYZ_to_RGB.html
/// </remarks>
public sealed class sRGBCompanding : ICompanding
{
/// <inheritdoc />
public double InverseCompanding(double channel)
{
var V = channel;
var v = V <= 0.04045 ? V / 12.92 : Math.Pow((V + 0.055) / 1.055, 2.4);
return v;
}
/// <inheritdoc />
public double Companding(double channel)
{
var v = channel;
var V = v <= 0.0031308 ? 12.92 * v : 1.055 * Math.Pow(v, 1 / 2.4d) - 0.055;
return V;
}
/// <inheritdoc cref="object" />
public override bool Equals(object obj) => obj is sRGBCompanding;
/// <inheritdoc cref="object" />
public override int GetHashCode() => 1;
/// <inheritdoc cref="object" />
public static bool operator ==(sRGBCompanding left, sRGBCompanding right) => Equals(left, right);
/// <inheritdoc cref="object" />
public static bool operator !=(sRGBCompanding left, sRGBCompanding right) => !Equals(left, right);
}
}
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