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using System;
namespace Colourful.Implementation.Conversion
{
/// <summary>
/// Converts from <see cref="HunterLabColor" /> to <see cref="XYZColor" />.
/// </summary>
public sealed class HunterLabToXYZConverter : XYZAndHunterLabConverterBase, IColorConversion<HunterLabColor, XYZColor>
{
/// <summary>
/// Default singleton instance of the converter.
/// </summary>
public static readonly HunterLabToXYZConverter Default = new HunterLabToXYZConverter();
/// <summary>
/// Converts from <see cref="HunterLabColor" /> to <see cref="XYZColor" />.
/// </summary>
public XYZColor Convert(in HunterLabColor input)
{
double L = input.L, a = input.a, b = input.b;
double Xn = input.WhitePoint.X, Yn = input.WhitePoint.Y, Zn = input.WhitePoint.Z;
var Ka = ComputeKa(input.WhitePoint);
var Kb = ComputeKb(input.WhitePoint);
var Y = MathUtils.Pow2(L / 100d) * Yn;
var X = (a / Ka * Math.Sqrt(Y / Yn) + Y / Yn) * Xn;
var Z = (b / Kb * Math.Sqrt(Y / Yn) - Y / Yn) * -Zn;
var result = new XYZColor(X, Y, Z);
return result;
}
#region Overrides
/// <inheritdoc cref="object" />
public override bool Equals(object obj) => obj is HunterLabToXYZConverter;
/// <inheritdoc cref="object" />
public override int GetHashCode() => 1;
/// <inheritdoc cref="object" />
public static bool operator ==(HunterLabToXYZConverter left, HunterLabToXYZConverter right) => Equals(left, right);
/// <inheritdoc cref="object" />
public static bool operator !=(HunterLabToXYZConverter left, HunterLabToXYZConverter right) => !Equals(left, right);
#endregion
}
}
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