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using Vector = System.Collections.Generic.IReadOnlyList<double>;
namespace Colourful.Implementation.Conversion
{
/// <summary>
/// Converts from <see cref="RGBColor" /> to <see cref="LinearRGBColor" />.
/// </summary>
public sealed class RGBToLinearRGBConverter : IColorConversion<RGBColor, LinearRGBColor>
{
/// <summary>
/// Default singleton instance of the converter.
/// </summary>
public static readonly RGBToLinearRGBConverter Default = new RGBToLinearRGBConverter();
/// <summary>
/// Converts from <see cref="RGBColor" /> to <see cref="LinearRGBColor" />.
/// </summary>
public LinearRGBColor Convert(in RGBColor input)
{
var uncompandedVector = UncompandVector(input);
var converted = new LinearRGBColor(uncompandedVector, input.WorkingSpace);
return converted;
}
/// <summary>
/// Applying the working space inverse companding function (<see cref="IRGBWorkingSpace.Companding" />) to RGB vector.
/// </summary>
private static Vector UncompandVector(in RGBColor rgbColor)
{
var companding = rgbColor.WorkingSpace.Companding;
var compandedVector = rgbColor.Vector;
Vector uncompandedVector = new[]
{
companding.InverseCompanding(compandedVector[0]).CropRange(0, 1),
companding.InverseCompanding(compandedVector[1]).CropRange(0, 1),
companding.InverseCompanding(compandedVector[2]).CropRange(0, 1)
};
return uncompandedVector;
}
#region Overrides
/// <inheritdoc cref="object" />
public bool Equals(RGBToLinearRGBConverter other) => other != null;
/// <inheritdoc cref="object" />
public override bool Equals(object obj) => obj is RGBToLinearRGBConverter;
/// <inheritdoc cref="object" />
public override int GetHashCode() => 1;
/// <inheritdoc cref="object" />
public static bool operator ==(RGBToLinearRGBConverter left, RGBToLinearRGBConverter right) => Equals(left, right);
/// <inheritdoc cref="object" />
public static bool operator !=(RGBToLinearRGBConverter left, RGBToLinearRGBConverter right) => !Equals(left, right);
#endregion
}
}
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