The return of IPackedVector<T>

src/ImageSharp/Colors/Color.cs

@@ -18,7 +18,7 @@ namespace ImageSharp
     /// This struct is fully mutable. This is done (against the guidelines) for the sake of performance,
     /// as it avoids the need to create new values for modification operations.
     /// </remarks>
-    public partial struct Color : IPixel<Color>
+    public partial struct Color : IPixel<Color>, IPackedVector<uint>
     {
         /// <summary>
         /// The shift count for the red component

src/ImageSharp/Colors/PackedPixel/Alpha8.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing a single 8 bit normalized W values ranging from 0 to 1.
     /// </summary>
-    public struct Alpha8 : IPixel<Alpha8>
+    public struct Alpha8 : IPixel<Alpha8>, IPackedVector<byte>
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="Alpha8"/> struct.

src/ImageSharp/Colors/PackedPixel/Argb.cs

@@ -17,7 +17,7 @@ namespace ImageSharp
     /// This struct is fully mutable. This is done (against the guidelines) for the sake of performance,
     /// as it avoids the need to create new values for modification operations.
     /// </remarks>
-    public struct Argb : IPixel<Argb>
+    public struct Argb : IPixel<Argb>, IPackedVector<uint>
     {
         /// <summary>
         /// The shift count for the blue component

src/ImageSharp/Colors/PackedPixel/Bgr565.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing unsigned normalized values ranging from 0 to 1. The x and z components use 5 bits, and the y component uses 6 bits.
     /// </summary>
-    public struct Bgr565 : IPixel<Bgr565>
+    public struct Bgr565 : IPixel<Bgr565>, IPackedVector<ushort>
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="Bgr565"/> struct.

src/ImageSharp/Colors/PackedPixel/Bgra4444.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing unsigned normalized values, ranging from 0 to 1, using 4 bits each for x, y, z, and w.
     /// </summary>
-    public struct Bgra4444 : IPixel<Bgra4444>
+    public struct Bgra4444 : IPixel<Bgra4444>, IPackedVector<ushort>
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="Bgra4444"/> struct.

src/ImageSharp/Colors/PackedPixel/Bgra5551.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing unsigned normalized values ranging from 0 to 1. The x , y and z components use 5 bits, and the w component uses 1 bit.
     /// </summary>
-    public struct Bgra5551 : IPixel<Bgra5551>
+    public struct Bgra5551 : IPixel<Bgra5551>, IPackedVector<ushort>
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="Bgra5551"/> struct.

src/ImageSharp/Colors/PackedPixel/Byte4.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing four 8-bit unsigned integer values, ranging from 0 to 255.
     /// </summary>
-    public struct Byte4 : IPixel<Byte4>
+    public struct Byte4 : IPixel<Byte4>, IPackedVector<uint>
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="Byte4"/> struct.

src/ImageSharp/Colors/PackedPixel/HalfSingle.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing a single 16 bit floating point value.
     /// </summary>
-    public struct HalfSingle : IPixel<HalfSingle>
+    public struct HalfSingle : IPixel<HalfSingle>, IPackedVector<ushort>
     {
         /// <summary>
         /// The maximum byte value.

src/ImageSharp/Colors/PackedPixel/HalfVector2.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing two 16-bit floating-point values.
     /// </summary>
-    public struct HalfVector2 : IPixel<HalfVector2>
+    public struct HalfVector2 : IPixel<HalfVector2>, IPackedVector<uint>
     {
         /// <summary>
         /// The maximum byte value.

src/ImageSharp/Colors/PackedPixel/HalfVector4.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing four 16-bit floating-point values.
     /// </summary>
-    public struct HalfVector4 : IPixel<HalfVector4>
+    public struct HalfVector4 : IPixel<HalfVector4>, IPackedVector<ulong>
     {
         /// <summary>
         /// The maximum byte value.

src/ImageSharp/Colors/PackedPixel/IPackedVector{TPacked}.cs

@@ -0,0 +1,24 @@
+// <copyright file="IPackedVector{TPacked}.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp
+{
+    using System;
+    using System.Numerics;
+
+    /// <summary>
+    /// This interface exists for ensuring signature compatibility to MonoGame and XNA packed color types.
+    /// <see href="https://msdn.microsoft.com/en-us/library/bb197661.aspx" />
+    /// </summary>
+    /// <typeparam name="TPacked">The packed format. <example>uint, long, float.</example></typeparam>
+    public interface IPackedVector<TPacked> : IPixel
+        where TPacked : struct, IEquatable<TPacked>
+    {
+        /// <summary>
+        /// Gets or sets the packed representation of the value.
+        /// </summary>
+        TPacked PackedValue { get; set; }
+    }
+}

src/ImageSharp/Colors/PackedPixel/NormalizedByte2.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed packed pixel type containing two 8-bit signed normalized values, ranging from −1 to 1.
     /// </summary>
-    public struct NormalizedByte2 : IPixel<NormalizedByte2>
+    public struct NormalizedByte2 : IPixel<NormalizedByte2>, IPackedVector<ushort>
     {
         /// <summary>
         /// The maximum byte value.

src/ImageSharp/Colors/PackedPixel/NormalizedByte4.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing four 8-bit signed normalized values, ranging from −1 to 1.
     /// </summary>
-    public struct NormalizedByte4 : IPixel<NormalizedByte4>
+    public struct NormalizedByte4 : IPixel<NormalizedByte4>, IPackedVector<uint>
     {
         /// <summary>
         /// The maximum byte value.

src/ImageSharp/Colors/PackedPixel/NormalizedShort2.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing two 16-bit signed normalized values, ranging from −1 to 1.
     /// </summary>
-    public struct NormalizedShort2 : IPixel<NormalizedShort2>
+    public struct NormalizedShort2 : IPixel<NormalizedShort2>, IPackedVector<uint>
     {
         /// <summary>
         /// The maximum byte value.

src/ImageSharp/Colors/PackedPixel/NormalizedShort4.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing four 16-bit signed normalized values, ranging from −1 to 1.
     /// </summary>
-    public struct NormalizedShort4 : IPixel<NormalizedShort4>
+    public struct NormalizedShort4 : IPixel<NormalizedShort4>, IPackedVector<ulong>
     {
         /// <summary>
         /// The maximum byte value.

src/ImageSharp/Colors/PackedPixel/Rg32.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing two 16-bit unsigned normalized values ranging from 0 to 1.
     /// </summary>
-    public struct Rg32 : IPixel<Rg32>
+    public struct Rg32 : IPixel<Rg32>, IPackedVector<uint>
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="Rg32"/> struct.

src/ImageSharp/Colors/PackedPixel/Rgba1010102.cs

@@ -13,7 +13,7 @@ namespace ImageSharp
     /// Packed vector type containing unsigned normalized values ranging from 0 to 1.
     /// The x, y and z components use 10 bits, and the w component uses 2 bits.
     /// </summary>
-    public struct Rgba1010102 : IPixel<Rgba1010102>
+    public struct Rgba1010102 : IPixel<Rgba1010102>, IPackedVector<uint>
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="Rgba1010102"/> struct.

src/ImageSharp/Colors/PackedPixel/Rgba64.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing four 16-bit unsigned normalized values ranging from 0 to 1.
     /// </summary>
-    public struct Rgba64 : IPixel<Rgba64>
+    public struct Rgba64 : IPixel<Rgba64>, IPackedVector<ulong>
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="Rgba64"/> struct.

src/ImageSharp/Colors/PackedPixel/Short2.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing two 16-bit signed integer values.
     /// </summary>
-    public struct Short2 : IPixel<Short2>
+    public struct Short2 : IPixel<Short2>, IPackedVector<uint>
     {
         /// <summary>
         /// The maximum byte value.

src/ImageSharp/Colors/PackedPixel/Short4.cs

@@ -12,7 +12,7 @@ namespace ImageSharp
     /// <summary>
     /// Packed pixel type containing four 16-bit signed integer values.
     /// </summary>
-    public struct Short4 : IPixel<Short4>
+    public struct Short4 : IPixel<Short4>, IPackedVector<ulong>
     {
         /// <summary>
         /// The maximum byte value.

tests/ImageSharp.Tests/Common/ArrayPointerTests.cs

@@ -26,23 +26,7 @@ namespace ImageSharp.Tests.Common
                 return result;
             }
         }
-
+        
-        [Fact]
-        public void ConstructWithNullArray_Throws()
-        {
-            Assert.Throws<ArgumentNullException>(
-                () =>
-                    {
-                        new ArrayPointer<int>(null, (void*)0);
-                    });
-
-            Assert.Throws<ArgumentNullException>(
-                () =>
-                {
-                    new ArrayPointer<int>(null, (void*)0);
-                });
-        }
-
         [Fact]
         public void ConstructWithoutOffset()
         {