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using Matrix = System.Collections.Generic.IReadOnlyList<System.Collections.Generic.IReadOnlyList<double>>;
namespace Colourful.Implementation.Conversion
{
/// <summary>
/// Converts from <see cref="XYZColor" /> to <see cref="LinearRGBColor" />.
/// </summary>
/// <remarks>
/// The target RGB working space is <see cref="RGBColor.DefaultWorkingSpace" /> when not set.
/// </remarks>
public sealed class XYZToLinearRGBConverter : LinearRGBAndXYZConverterBase, IColorConversion<XYZColor, LinearRGBColor>
{
private readonly Matrix _conversionMatrix;
/// <summary>
/// Constructs with <see cref="RGBColor.DefaultWorkingSpace" />.
/// </summary>
public XYZToLinearRGBConverter() : this(null)
{
}
/// <summary>
/// Constructs with arbitrary working space.
/// </summary>
public XYZToLinearRGBConverter(IRGBWorkingSpace targetRGBWorkingSpace)
{
TargetRGBWorkingSpace = targetRGBWorkingSpace ?? RGBColor.DefaultWorkingSpace;
_conversionMatrix = GetXYZToRGBMatrix(TargetRGBWorkingSpace);
}
/// <summary>
/// Target RGB working space. When not set, target RGB working space is <see cref="RGBColor.DefaultWorkingSpace" />.
/// </summary>
public IRGBWorkingSpace TargetRGBWorkingSpace { get; }
/// <summary>
/// Converts from <see cref="XYZColor" /> to <see cref="LinearRGBColor" />.
/// </summary>
public LinearRGBColor Convert(in XYZColor input)
{
var inputVector = input.Vector;
var uncompandedVector = _conversionMatrix.MultiplyBy(inputVector).CropRange(0, 1);
var result = new LinearRGBColor(uncompandedVector, TargetRGBWorkingSpace);
return result;
}
#region Overrides
/// <inheritdoc cref="object" />
public bool Equals(XYZToLinearRGBConverter other)
{
if (other == null)
return false;
return ReferenceEquals(this, other) || TargetRGBWorkingSpace.Equals(other.TargetRGBWorkingSpace);
}
/// <inheritdoc cref="object" />
public override bool Equals(object obj) => obj is XYZToLinearRGBConverter other && Equals(other);
/// <inheritdoc cref="object" />
public override int GetHashCode() => TargetRGBWorkingSpace?.GetHashCode() ?? 0;
/// <inheritdoc cref="object" />
public static bool operator ==(XYZToLinearRGBConverter left, XYZToLinearRGBConverter right) => Equals(left, right);
/// <inheritdoc cref="object" />
public static bool operator !=(XYZToLinearRGBConverter left, XYZToLinearRGBConverter right) => !Equals(left, right);
#endregion
}
}
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