Made colors equatable; added more tests; small improvements; changed test-data to cover more edge-cases

HPPH/Colors/IColor.cs

@@ -3,7 +3,7 @@
 /// <summary>
 /// Represents a generic color made of 4 bytes (alpha, red, green and blue)
 /// </summary>
-public interface IColor
+public interface IColor : IEquatable<IColor>
 {
     /// <summary>
     /// Gets the red-component of this color.

HPPH/Data/Generic3ByteMinMax.cs

@@ -13,8 +13,4 @@ internal readonly struct Generic3ByteMinMax(byte b1Min, byte b1Max, byte b2Min,
 
     public readonly byte B3Min = b3Min;
     public readonly byte B3Max = b3Max;
-
-    public byte B1Range => (byte)(B1Max - B1Min);
-    public byte B2Range => (byte)(B2Max - B2Min);
-    public byte B3Range => (byte)(B3Max - B3Min);
 }

HPPH/Data/Generic4ByteMinMax.cs

@@ -16,9 +16,4 @@ internal readonly struct Generic4ByteMinMax(byte b1Min, byte b1Max, byte b2Min,
 
     public readonly byte B4Min = b4Min;
     public readonly byte B4Max = b4Max;
-
-    public byte B1Range => (byte)(B1Max - B1Min);
-    public byte B2Range => (byte)(B2Max - B2Min);
-    public byte B3Range => (byte)(B3Max - B3Min);
-    public byte B4Range => (byte)(B4Max - B4Min);
 }

HPPH/Generated/HPPH.Generators/HPPH.Generators.ColorSourceGenerator/ColorABGR.g.cs

@@ -49,6 +49,9 @@ public readonly partial struct ColorABGR(byte a, byte b, byte g, byte r) : IColo
 
     #region Methods
 
+    /// <inheritdoc />
+    public bool Equals(IColor? other) => (other != null) && (R == other.R) && (G == other.G) && (B == other.B) && (A == other.A);
+
     /// <inheritdoc />
     public override string ToString() => $"[A: {A}, R: {R}, G: {G}, B: {B}]";
 

HPPH/Generated/HPPH.Generators/HPPH.Generators.ColorSourceGenerator/ColorARGB.g.cs

@@ -49,6 +49,9 @@ public readonly partial struct ColorARGB(byte a, byte r, byte g, byte b) : IColo
 
     #region Methods
 
+    /// <inheritdoc />
+    public bool Equals(IColor? other) => (other != null) && (R == other.R) && (G == other.G) && (B == other.B) && (A == other.A);
+
     /// <inheritdoc />
     public override string ToString() => $"[A: {A}, R: {R}, G: {G}, B: {B}]";
 

HPPH/Generated/HPPH.Generators/HPPH.Generators.ColorSourceGenerator/ColorBGR.g.cs

@@ -47,6 +47,9 @@ public readonly partial struct ColorBGR(byte b, byte g, byte r): IColor
 
     #region Methods
 
+    /// <inheritdoc />
+    public bool Equals(IColor? other) => (other != null) && (R == other.R) && (G == other.G) && (B == other.B) && (A == other.A);
+
     /// <inheritdoc />
     public override string ToString() => $"[A: {A}, R: {R}, G: {G}, B: {B}]";
 

HPPH/Generated/HPPH.Generators/HPPH.Generators.ColorSourceGenerator/ColorBGRA.g.cs

@@ -49,6 +49,9 @@ public readonly partial struct ColorBGRA(byte b, byte g, byte r, byte a) : IColo
 
     #region Methods
 
+    /// <inheritdoc />
+    public bool Equals(IColor? other) => (other != null) && (R == other.R) && (G == other.G) && (B == other.B) && (A == other.A);
+
     /// <inheritdoc />
     public override string ToString() => $"[A: {A}, R: {R}, G: {G}, B: {B}]";
 

HPPH/Generated/HPPH.Generators/HPPH.Generators.ColorSourceGenerator/ColorRGB.g.cs

@@ -47,6 +47,9 @@ public readonly partial struct ColorRGB(byte r, byte g, byte b): IColor
 
     #region Methods
 
+    /// <inheritdoc />
+    public bool Equals(IColor? other) => (other != null) && (R == other.R) && (G == other.G) && (B == other.B) && (A == other.A);
+
     /// <inheritdoc />
     public override string ToString() => $"[A: {A}, R: {R}, G: {G}, B: {B}]";
 

HPPH/Generated/HPPH.Generators/HPPH.Generators.ColorSourceGenerator/ColorRGBA.g.cs

@@ -49,6 +49,9 @@ public readonly partial struct ColorRGBA(byte r, byte g, byte b, byte a) : IColo
 
     #region Methods
 
+    /// <inheritdoc />
+    public bool Equals(IColor? other) => (other != null) && (R == other.R) && (G == other.G) && (B == other.B) && (A == other.A);
+
     /// <inheritdoc />
     public override string ToString() => $"[A: {A}, R: {R}, G: {G}, B: {B}]";
 

HPPH/Images/Interfaces/IImageRow.cs

@@ -22,6 +22,8 @@ public interface IImageRow : IEnumerable<IColor>
     /// <returns>The <see cref="IColor"/> at the specified location.</returns>
     IColor this[int x] { get; }
 
+    void CopyTo(Span<IColor> destination);
+
     /// <summary>
     /// Copies the contents of this <see cref="IImageRow"/> into a destination <see cref="Span{T}"/> instance.
     /// </summary>

HPPH/PixelHelper.Quantize.cs

@@ -66,6 +66,9 @@ public static partial class PixelHelper
     public static T[] CreateColorPalette<T>(this Span<T> colors, int paletteSize)
         where T : unmanaged, IColor
     {
+        if (paletteSize < 0) throw new ArgumentException("PaletteSize Can't be < 0", nameof(paletteSize));
+        if (paletteSize == 0) return [];
+
         int splits = BitOperations.Log2((uint)paletteSize);
 
         Span<ColorCube<T>> cubes = new ColorCube<T>[1 << splits];