Sequential layout plus faster equality checks.

src/ImageSharp/ColorProfiles/CieLab.cs

@@ -3,6 +3,7 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
@@ -10,6 +11,7 @@ namespace SixLabors.ImageSharp.ColorProfiles;
 /// Represents a CIE L*a*b* 1976 color.
 /// <see href="https://en.wikipedia.org/wiki/Lab_color_space"/>
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct CieLab : IProfileConnectingSpace<CieLab, CieXyz>
 {
     /// <summary>
@@ -80,20 +82,6 @@ public readonly struct CieLab : IProfileConnectingSpace<CieLab, CieXyz>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static bool operator !=(CieLab left, CieLab right) => !left.Equals(right);
 
-    /// <inheritdoc/>
-    public override int GetHashCode() => HashCode.Combine(this.L, this.A, this.B);
-
-    /// <inheritdoc/>
-    public override string ToString() => FormattableString.Invariant($"CieLab({this.L:#0.##}, {this.A:#0.##}, {this.B:#0.##})");
-
-    /// <inheritdoc/>
-    public override bool Equals(object? obj) => obj is CieLab other && this.Equals(other);
-
-    /// <inheritdoc/>
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public bool Equals(CieLab other)
-        => new Vector3(this.L, this.A, this.B) == new Vector3(other.L, other.A, other.B);
-
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static CieLab FromProfileConnectingSpace(ColorConversionOptions options, in CieXyz source)
@@ -171,4 +159,20 @@ public readonly struct CieLab : IProfileConnectingSpace<CieLab, CieXyz>
     /// <inheritdoc/>
     public static ChromaticAdaptionWhitePointSource GetChromaticAdaptionWhitePointSource()
         => ChromaticAdaptionWhitePointSource.WhitePoint;
+
+    /// <inheritdoc/>
+    public override int GetHashCode() => HashCode.Combine(this.L, this.A, this.B);
+
+    /// <inheritdoc/>
+    public override string ToString() => FormattableString.Invariant($"CieLab({this.L:#0.##}, {this.A:#0.##}, {this.B:#0.##})");
+
+    /// <inheritdoc/>
+    public override bool Equals(object? obj) => obj is CieLab other && this.Equals(other);
+
+    /// <inheritdoc/>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool Equals(CieLab other)
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
+
+    private Vector3 AsVector3Unsafe() => Unsafe.As<CieLab, Vector3>(ref Unsafe.AsRef(in this));
 }

src/ImageSharp/ColorProfiles/CieLch.cs

@@ -3,6 +3,7 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
@@ -10,6 +11,7 @@ namespace SixLabors.ImageSharp.ColorProfiles;
 /// Represents the CIE L*C*h°, cylindrical form of the CIE L*a*b* 1976 color.
 /// <see href="https://en.wikipedia.org/wiki/Lab_color_space#Cylindrical_representation:_CIELCh_or_CIEHLC"/>
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct CieLch : IColorProfile<CieLch, CieLab>
 {
     private static readonly Vector3 Min = new(0, -200, 0);
@@ -80,22 +82,6 @@ public readonly struct CieLch : IColorProfile<CieLch, CieLab>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static bool operator !=(CieLch left, CieLch right) => !left.Equals(right);
 
-    /// <inheritdoc/>
-    public override int GetHashCode()
-        => HashCode.Combine(this.L, this.C, this.H);
-
-    /// <inheritdoc/>
-    public override string ToString() => FormattableString.Invariant($"CieLch({this.L:#0.##}, {this.C:#0.##}, {this.H:#0.##})");
-
-    /// <inheritdoc/>
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public override bool Equals(object? obj) => obj is CieLch other && this.Equals(other);
-
-    /// <inheritdoc/>
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public bool Equals(CieLch other)
-        => new Vector3(this.L, this.C, this.H) == new Vector3(other.L, other.C, other.H);
-
     /// <inheritdoc/>
     public static CieLch FromProfileConnectingSpace(ColorConversionOptions options, in CieLab source)
     {
@@ -159,4 +145,22 @@ public readonly struct CieLch : IColorProfile<CieLch, CieLab>
     /// <inheritdoc/>
     public static ChromaticAdaptionWhitePointSource GetChromaticAdaptionWhitePointSource()
         => ChromaticAdaptionWhitePointSource.WhitePoint;
+
+    /// <inheritdoc/>
+    public override int GetHashCode()
+        => HashCode.Combine(this.L, this.C, this.H);
+
+    /// <inheritdoc/>
+    public override string ToString() => FormattableString.Invariant($"CieLch({this.L:#0.##}, {this.C:#0.##}, {this.H:#0.##})");
+
+    /// <inheritdoc/>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public override bool Equals(object? obj) => obj is CieLch other && this.Equals(other);
+
+    /// <inheritdoc/>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool Equals(CieLch other)
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
+
+    private Vector3 AsVector3Unsafe() => Unsafe.As<CieLch, Vector3>(ref Unsafe.AsRef(in this));
 }

src/ImageSharp/ColorProfiles/CieLchuv.cs

@@ -3,6 +3,7 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
@@ -10,6 +11,7 @@ namespace SixLabors.ImageSharp.ColorProfiles;
 /// Represents the CIE L*C*h°, cylindrical form of the CIE L*u*v* 1976 color.
 /// <see href="https://en.wikipedia.org/wiki/CIELAB_color_space#Cylindrical_representation:_CIELCh_or_CIEHLC"/>
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct CieLchuv : IColorProfile<CieLchuv, CieXyz>
 {
     private static readonly Vector3 Min = new(0, -200, 0);
@@ -159,25 +161,7 @@ public readonly struct CieLchuv : IColorProfile<CieLchuv, CieXyz>
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public bool Equals(CieLchuv other)
-        => new Vector3(this.L, this.C, this.H) == new Vector3(other.L, other.C, other.H);
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
 
-    /// <summary>
-    /// Computes the saturation of the color (chroma normalized by lightness)
-    /// </summary>
-    /// <remarks>
-    /// A value ranging from 0 to 100.
-    /// </remarks>
-    /// <returns>The <see cref="float"/></returns>
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public float Saturation()
-    {
-        float result = 100 * (this.C / this.L);
-
-        if (float.IsNaN(result))
-        {
-            return 0;
-        }
-
-        return result;
-    }
+    private Vector3 AsVector3Unsafe() => Unsafe.As<CieLchuv, Vector3>(ref Unsafe.AsRef(in this));
 }

src/ImageSharp/ColorProfiles/CieLuv.cs

@@ -3,6 +3,7 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
@@ -12,6 +13,7 @@ namespace SixLabors.ImageSharp.ColorProfiles;
 /// attempted perceptual uniformity
 /// <see href="https://en.wikipedia.org/wiki/CIELUV"/>
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct CieLuv : IColorProfile<CieLuv, CieXyz>
 {
     /// <summary>
@@ -205,7 +207,9 @@ public readonly struct CieLuv : IColorProfile<CieLuv, CieXyz>
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public bool Equals(CieLuv other)
-        => new Vector3(this.L, this.U, this.V) == new Vector3(other.L, other.U, other.V);
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
+
+    private Vector3 AsVector3Unsafe() => Unsafe.As<CieLuv, Vector3>(ref Unsafe.AsRef(in this));
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private static double ComputeU(in CieXyz source)

src/ImageSharp/ColorProfiles/CieXyChromaticityCoordinates.cs

@@ -3,13 +3,14 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
-// ReSharper disable CompareOfFloatsByEqualityOperator
 namespace SixLabors.ImageSharp.ColorProfiles;
 
 /// <summary>
 /// Represents the coordinates of CIEXY chromaticity space.
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct CieXyChromaticityCoordinates : IEquatable<CieXyChromaticityCoordinates>
 {
     /// <summary>
@@ -80,5 +81,7 @@ public readonly struct CieXyChromaticityCoordinates : IEquatable<CieXyChromatici
     /// <inheritdoc/>
     [MethodImpl(InliningOptions.ShortMethod)]
     public bool Equals(CieXyChromaticityCoordinates other)
-        => new Vector2(this.X, this.Y) == new Vector2(other.X, other.Y);
+        => this.AsVector2Unsafe() == other.AsVector2Unsafe();
+
+    private Vector2 AsVector2Unsafe() => Unsafe.As<CieXyChromaticityCoordinates, Vector2>(ref Unsafe.AsRef(in this));
 }

src/ImageSharp/ColorProfiles/CieXyy.cs

@@ -3,6 +3,7 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
@@ -10,6 +11,7 @@ namespace SixLabors.ImageSharp.ColorProfiles;
 /// Represents an CIE xyY 1931 color
 /// <see href="https://en.wikipedia.org/wiki/CIE_1931_color_space#CIE_xy_chromaticity_diagram_and_the_CIE_xyY_color_space"/>
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct CieXyy : IColorProfile<CieXyy, CieXyz>
 {
     /// <summary>
@@ -150,5 +152,7 @@ public readonly struct CieXyy : IColorProfile<CieXyy, CieXyz>
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public bool Equals(CieXyy other)
-        => new Vector3(this.X, this.Y, this.Yl) == new Vector3(other.X, other.Y, other.Yl);
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
+
+    private Vector3 AsVector3Unsafe() => Unsafe.As<CieXyy, Vector3>(ref Unsafe.AsRef(in this));
 }

src/ImageSharp/ColorProfiles/CieXyz.cs

@@ -3,6 +3,7 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
@@ -10,6 +11,7 @@ namespace SixLabors.ImageSharp.ColorProfiles;
 /// Represents an CIE XYZ 1931 color
 /// <see href="https://en.wikipedia.org/wiki/CIE_1931_color_space#Definition_of_the_CIE_XYZ_color_space"/>
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct CieXyz : IProfileConnectingSpace<CieXyz, CieXyz>
 {
     /// <summary>
@@ -86,20 +88,6 @@ public readonly struct CieXyz : IProfileConnectingSpace<CieXyz, CieXyz>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public Vector3 ToVector3() => new(this.X, this.Y, this.Z);
 
-    /// <inheritdoc/>
-    public override int GetHashCode() => HashCode.Combine(this.X, this.Y, this.Z);
-
-    /// <inheritdoc/>
-    public override string ToString() => FormattableString.Invariant($"CieXyz({this.X:#0.##}, {this.Y:#0.##}, {this.Z:#0.##})");
-
-    /// <inheritdoc/>
-    public override bool Equals(object? obj) => obj is CieXyz other && this.Equals(other);
-
-    /// <inheritdoc/>
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public bool Equals(CieXyz other)
-        => new Vector3(this.X, this.Y, this.Z) == new Vector3(other.X, other.Y, other.Z);
-
     /// <inheritdoc/>
     public static CieXyz FromProfileConnectingSpace(ColorConversionOptions options, in CieXyz source)
         => new(source.X, source.Y, source.Z);
@@ -124,4 +112,20 @@ public readonly struct CieXyz : IProfileConnectingSpace<CieXyz, CieXyz>
 
     /// <inheritdoc/>
     public static ChromaticAdaptionWhitePointSource GetChromaticAdaptionWhitePointSource() => ChromaticAdaptionWhitePointSource.WhitePoint;
+
+    /// <inheritdoc/>
+    public override int GetHashCode() => HashCode.Combine(this.X, this.Y, this.Z);
+
+    /// <inheritdoc/>
+    public override string ToString() => FormattableString.Invariant($"CieXyz({this.X:#0.##}, {this.Y:#0.##}, {this.Z:#0.##})");
+
+    /// <inheritdoc/>
+    public override bool Equals(object? obj) => obj is CieXyz other && this.Equals(other);
+
+    /// <inheritdoc/>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool Equals(CieXyz other)
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
+
+    private Vector3 AsVector3Unsafe() => Unsafe.As<CieXyz, Vector3>(ref Unsafe.AsRef(in this));
 }

src/ImageSharp/ColorProfiles/Cmyk.cs

@@ -3,12 +3,14 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
 /// <summary>
 /// Represents an CMYK (cyan, magenta, yellow, keyline) color.
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct Cmyk : IColorProfile<Cmyk, Rgb>
 {
     private static readonly Vector4 Min = Vector4.Zero;
@@ -157,5 +159,7 @@ public readonly struct Cmyk : IColorProfile<Cmyk, Rgb>
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public bool Equals(Cmyk other)
-        => new Vector4(this.C, this.M, this.Y, this.K) == new Vector4(other.C, other.M, other.Y, other.K);
+        => this.AsVector4Unsafe() == other.AsVector4Unsafe();
+
+    private Vector4 AsVector4Unsafe() => Unsafe.As<Cmyk, Vector4>(ref Unsafe.AsRef(in this));
 }

src/ImageSharp/ColorProfiles/Hsl.cs

@@ -3,12 +3,14 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
 /// <summary>
 /// Represents a Hsl (hue, saturation, lightness) color.
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct Hsl : IColorProfile<Hsl, Rgb>
 {
     private static readonly Vector3 Min = Vector3.Zero;
@@ -200,7 +202,9 @@ public readonly struct Hsl : IColorProfile<Hsl, Rgb>
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public bool Equals(Hsl other)
-        => new Vector3(this.H, this.S, this.L) == new Vector3(other.H, other.S, other.L);
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
+
+    private Vector3 AsVector3Unsafe() => Unsafe.As<Hsl, Vector3>(ref Unsafe.AsRef(in this));
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private static float GetColorComponent(float first, float second, float third)

src/ImageSharp/ColorProfiles/Hsv.cs

@@ -3,12 +3,14 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
 /// <summary>
 /// Represents a HSV (hue, saturation, value) color. Also known as HSB (hue, saturation, brightness).
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct Hsv : IColorProfile<Hsv, Rgb>
 {
     private static readonly Vector3 Min = Vector3.Zero;
@@ -223,5 +225,7 @@ public readonly struct Hsv : IColorProfile<Hsv, Rgb>
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public bool Equals(Hsv other)
-        => new Vector3(this.H, this.S, this.V) == new Vector3(other.H, other.S, other.V);
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
+
+    private Vector3 AsVector3Unsafe() => Unsafe.As<Hsv, Vector3>(ref Unsafe.AsRef(in this));
 }

src/ImageSharp/ColorProfiles/HunterLab.cs

@@ -3,6 +3,7 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
@@ -10,6 +11,7 @@ namespace SixLabors.ImageSharp.ColorProfiles;
 /// Represents an Hunter LAB color.
 /// <see href="https://en.wikipedia.org/wiki/Lab_color_space"/>.
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct HunterLab : IColorProfile<HunterLab, CieXyz>
 {
     /// <summary>
@@ -170,7 +172,9 @@ public readonly struct HunterLab : IColorProfile<HunterLab, CieXyz>
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public bool Equals(HunterLab other)
-        => new Vector3(this.L, this.A, this.B) == new Vector3(other.L, other.A, other.B);
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
+
+    private Vector3 AsVector3Unsafe() => Unsafe.As<HunterLab, Vector3>(ref Unsafe.AsRef(in this));
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private static float ComputeKa(in CieXyz whitePoint)

src/ImageSharp/ColorProfiles/Lms.cs

@@ -3,10 +3,17 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
-internal readonly struct Lms : IColorProfile<Lms, CieXyz>
+/// <summary>
+/// LMS is a color space represented by the response of the three types of cones of the human eye,
+/// named after their responsivity (sensitivity) at long, medium and short wavelengths.
+/// <see href="https://en.wikipedia.org/wiki/LMS_color_space"/>
+/// </summary>
+[StructLayout(LayoutKind.Sequential)]
+public readonly struct Lms : IColorProfile<Lms, CieXyz>
 {
     /// <summary>
     /// Initializes a new instance of the <see cref="Lms"/> struct.
@@ -82,20 +89,6 @@ internal readonly struct Lms : IColorProfile<Lms, CieXyz>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public Vector3 ToVector3() => new(this.L, this.M, this.S);
 
-    /// <inheritdoc/>
-    public override int GetHashCode() => HashCode.Combine(this.L, this.M, this.S);
-
-    /// <inheritdoc/>
-    public override string ToString() => FormattableString.Invariant($"Lms({this.L:#0.##}, {this.M:#0.##}, {this.S:#0.##})");
-
-    /// <inheritdoc/>
-    public override bool Equals(object? obj) => obj is Lms other && this.Equals(other);
-
-    /// <inheritdoc/>
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public bool Equals(Lms other)
-        => new Vector3(this.L, this.M, this.S) == new Vector3(other.L, other.M, other.S);
-
     /// <inheritdoc/>
     public static Lms FromProfileConnectingSpace(ColorConversionOptions options, in CieXyz source)
     {
@@ -136,4 +129,20 @@ internal readonly struct Lms : IColorProfile<Lms, CieXyz>
 
     /// <inheritdoc/>
     public static ChromaticAdaptionWhitePointSource GetChromaticAdaptionWhitePointSource() => ChromaticAdaptionWhitePointSource.WhitePoint;
+
+    /// <inheritdoc/>
+    public override int GetHashCode() => HashCode.Combine(this.L, this.M, this.S);
+
+    /// <inheritdoc/>
+    public override string ToString() => FormattableString.Invariant($"Lms({this.L:#0.##}, {this.M:#0.##}, {this.S:#0.##})");
+
+    /// <inheritdoc/>
+    public override bool Equals(object? obj) => obj is Lms other && this.Equals(other);
+
+    /// <inheritdoc/>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool Equals(Lms other)
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
+
+    private Vector3 AsVector3Unsafe() => Unsafe.As<Lms, Vector3>(ref Unsafe.AsRef(in this));
 }

src/ImageSharp/ColorProfiles/Rgb.cs

@@ -3,6 +3,7 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 using SixLabors.ImageSharp.ColorProfiles.WorkingSpaces;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
@@ -10,6 +11,7 @@ namespace SixLabors.ImageSharp.ColorProfiles;
 /// <summary>
 /// Represents an RGB (red, green, blue) color profile.
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct Rgb : IProfileConnectingSpace<Rgb, CieXyz>
 {
     /// <summary>
@@ -79,20 +81,6 @@ public readonly struct Rgb : IProfileConnectingSpace<Rgb, CieXyz>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static bool operator !=(Rgb left, Rgb right) => !left.Equals(right);
 
-    /// <inheritdoc/>
-    public override int GetHashCode() => HashCode.Combine(this.R, this.G, this.B);
-
-    /// <inheritdoc/>
-    public override string ToString() => FormattableString.Invariant($"Rgb({this.R:#0.##}, {this.G:#0.##}, {this.B:#0.##})");
-
-    /// <inheritdoc/>
-    public override bool Equals(object? obj) => obj is Rgb other && this.Equals(other);
-
-    /// <inheritdoc/>
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public bool Equals(Rgb other)
-        => new Vector3(this.R, this.G, this.B) == new Vector3(other.R, other.G, other.B);
-
     /// <inheritdoc/>
     public static Rgb FromProfileConnectingSpace(ColorConversionOptions options, in CieXyz source)
     {
@@ -201,6 +189,22 @@ public readonly struct Rgb : IProfileConnectingSpace<Rgb, CieXyz>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public Vector4 ToScaledVector4() => new(this.ToScaledVector3(), 1f);
 
+    /// <inheritdoc/>
+    public override int GetHashCode() => HashCode.Combine(this.R, this.G, this.B);
+
+    /// <inheritdoc/>
+    public override string ToString() => FormattableString.Invariant($"Rgb({this.R:#0.##}, {this.G:#0.##}, {this.B:#0.##})");
+
+    /// <inheritdoc/>
+    public override bool Equals(object? obj) => obj is Rgb other && this.Equals(other);
+
+    /// <inheritdoc/>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool Equals(Rgb other)
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
+
+    private Vector3 AsVector3Unsafe() => Unsafe.As<Rgb, Vector3>(ref Unsafe.AsRef(in this));
+
     private static Matrix4x4 GetCieXyzToRgbMatrix(RgbWorkingSpace workingSpace)
     {
         Matrix4x4 matrix = GetRgbToCieXyzMatrix(workingSpace);

src/ImageSharp/ColorProfiles/YCbCr.cs

@@ -3,6 +3,7 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace SixLabors.ImageSharp.ColorProfiles;
 
@@ -11,6 +12,7 @@ namespace SixLabors.ImageSharp.ColorProfiles;
 /// <see href="http://en.wikipedia.org/wiki/YCbCr"/>
 /// <see href="http://www.ijg.org/files/T-REC-T.871-201105-I!!PDF-E.pdf"/>
 /// </summary>
+[StructLayout(LayoutKind.Sequential)]
 public readonly struct YCbCr : IColorProfile<YCbCr, Rgb>
 {
     private static readonly Vector3 Min = Vector3.Zero;
@@ -152,5 +154,7 @@ public readonly struct YCbCr : IColorProfile<YCbCr, Rgb>
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public bool Equals(YCbCr other)
-        => new Vector3(this.Y, this.Cb, this.Cr) == new Vector3(other.Y, other.Cb, other.Cr);
+        => this.AsVector3Unsafe() == other.AsVector3Unsafe();
+
+    private Vector3 AsVector3Unsafe() => Unsafe.As<YCbCr, Vector3>(ref Unsafe.AsRef(in this));
 }