Add LMS and Lch tests

Author: JimBobSquarePants

src/ImageSharp/ColorProfiles/CieLch.cs

@@ -12,12 +12,6 @@ namespace SixLabors.ImageSharp.ColorProfiles;
 /// </summary>
 public readonly struct CieLch : IColorProfile<CieLch, CieLab>
 {
-    /// <summary>
-    /// D50 standard illuminant.
-    /// Used when reference white is not specified explicitly.
-    /// </summary>
-    public static readonly CieXyz DefaultWhitePoint = Illuminants.D50;
-
     private static readonly Vector3 Min = new(0, -200, 0);
     private static readonly Vector3 Max = new(100, 200, 360);
 
@@ -165,5 +159,6 @@ public static void ToProfileConnectionSpace(ColorConversionOptions options, Read
     }
 
     /// <inheritdoc/>
-    public static ChromaticAdaptionWhitePointSource GetChromaticAdaptionWhitePointSource() => ChromaticAdaptionWhitePointSource.WhitePoint;
+    public static ChromaticAdaptionWhitePointSource GetChromaticAdaptionWhitePointSource()
+        => ChromaticAdaptionWhitePointSource.WhitePoint;
 }

tests/ImageSharp.Tests/ColorProfiles/CieLabAndLmsConversionTests.cs

@@ -0,0 +1,70 @@
+// Copyright (c) Six Labors.
+// Licensed under the Six Labors Split License.
+
+using SixLabors.ImageSharp.ColorProfiles;
+
+namespace SixLabors.ImageSharp.Tests.ColorProfiles;
+
+/// <summary>
+/// Tests <see cref="CieLab"/>-<see cref="Lms"/> conversions.
+/// </summary>
+public class CieLabAndLmsConversionTests
+{
+    private static readonly ApproximateColorProfileComparer Comparer = new(.0002f);
+
+    [Theory]
+    [InlineData(0, 0, 0, 0, 0, 0)]
+    [InlineData(0.8303261, -0.5776886, 0.1133359, 30.66193, 291.57209, -11.25262)]
+    public void Convert_Lms_to_CieLab(float l2, float m, float s, float l, float a, float b)
+    {
+        // Arrange
+        Lms input = new(l2, m, s);
+        CieLab expected = new(l, a, b);
+        ColorProfileConverter converter = new();
+
+        Span<Lms> inputSpan = new Lms[5];
+        inputSpan.Fill(input);
+
+        Span<CieLab> actualSpan = new CieLab[5];
+
+        // Act
+        CieLab actual = converter.Convert<Lms, CieLab>(input);
+        converter.Convert<Lms, CieLab>(inputSpan, actualSpan);
+
+        // Assert
+        Assert.Equal(expected, actual, Comparer);
+
+        for (int i = 0; i < actualSpan.Length; i++)
+        {
+            Assert.Equal(expected, actualSpan[i], Comparer);
+        }
+    }
+
+    [Theory]
+    [InlineData(0, 0, 0, 0, 0, 0)]
+    [InlineData(30.66193, 291.57209, -11.25262, 0.8303261, -0.5776886, 0.1133359)]
+    public void Convert_CieLab_to_Lms(float l, float a, float b, float l2, float m, float s)
+    {
+        // Arrange
+        CieLab input = new(l, a, b);
+        Lms expected = new(l2, m, s);
+        ColorProfileConverter converter = new();
+
+        Span<CieLab> inputSpan = new CieLab[5];
+        inputSpan.Fill(input);
+
+        Span<Lms> actualSpan = new Lms[5];
+
+        // Act
+        Lms actual = converter.Convert<CieLab, Lms>(input);
+        converter.Convert<CieLab, Lms>(inputSpan, actualSpan);
+
+        // Assert
+        Assert.Equal(expected, actual, Comparer);
+
+        for (int i = 0; i < actualSpan.Length; i++)
+        {
+            Assert.Equal(expected, actualSpan[i], Comparer);
+        }
+    }
+}

tests/ImageSharp.Tests/ColorProfiles/CieLchAndCieLuvConversionTests.cs

@@ -0,0 +1,71 @@
+// Copyright (c) Six Labors.
+// Licensed under the Six Labors Split License.
+
+using SixLabors.ImageSharp.ColorProfiles;
+
+namespace SixLabors.ImageSharp.Tests.ColorProfiles;
+
+/// <summary>
+/// Tests <see cref="CieLch"/>-<see cref="CieLuv"/> conversions.
+/// </summary>
+public class CieLchAndCieLuvConversionTests
+{
+    private static readonly ApproximateColorProfileComparer Comparer = new(.0002f);
+
+    [Theory]
+    [InlineData(0, 0, 0, 0, 0, 0)]
+    [InlineData(36.0555, 103.6901, 10.01514, 34.89777, 187.6642, -7.181467)]
+    public void Convert_CieLch_to_CieLuv(float l, float c, float h, float l2, float u, float v)
+    {
+        // Arrange
+        CieLch input = new(l, c, h);
+        CieLuv expected = new(l2, u, v);
+        ColorConversionOptions options = new() { WhitePoint = Illuminants.D50, TargetWhitePoint = Illuminants.D65 };
+        ColorProfileConverter converter = new(options);
+
+        Span<CieLch> inputSpan = new CieLch[5];
+        inputSpan.Fill(input);
+
+        Span<CieLuv> actualSpan = new CieLuv[5];
+
+        // Act
+        CieLuv actual = converter.Convert<CieLch, CieLuv>(input);
+        converter.Convert<CieLch, CieLuv>(inputSpan, actualSpan);
+
+        // Assert
+        Assert.Equal(expected, actual, Comparer);
+
+        for (int i = 0; i < actualSpan.Length; i++)
+        {
+            Assert.Equal(expected, actualSpan[i], Comparer);
+        }
+    }
+
+    [Theory]
+    [InlineData(34.89777, 187.6642, -7.181467, 36.0555, 103.6901, 10.01514)]
+    public void Convert_CieLuv_to_CieLch(float l2, float u, float v, float l, float c, float h)
+    {
+        // Arrange
+        CieLuv input = new(l2, u, v);
+        CieLch expected = new(l, c, h);
+        ColorConversionOptions options = new() { WhitePoint = Illuminants.D65, TargetWhitePoint = Illuminants.D50 };
+        ColorProfileConverter converter = new(options);
+
+        Span<CieLuv> inputSpan = new CieLuv[5];
+        inputSpan.Fill(input);
+
+        Span<CieLch> actualSpan = new CieLch[5];
+
+        // Act
+        CieLch actual = converter.Convert<CieLuv, CieLch>(input);
+        converter.Convert<CieLuv, CieLch>(inputSpan, actualSpan);
+
+        // Assert
+        Assert.Equal(expected, actual, Comparer);
+
+        for (int i = 0; i < actualSpan.Length; i++)
+        {
+            Assert.Equal(expected, actualSpan[i], Comparer);
+        }
+    }
+}