diff --git a/src/ImageSharp/Colors/PackedPixel/HalfVector4.cs b/src/ImageSharp/Colors/PackedPixel/HalfVector4.cs
new file mode 100644
index 0000000000..4c4da339bb
--- /dev/null
+++ b/src/ImageSharp/Colors/PackedPixel/HalfVector4.cs
@@ -0,0 +1,182 @@
+//
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+//
+
+namespace ImageSharp
+{
+ using System;
+ using System.Numerics;
+
+ ///
+ /// Packed pixel type containing four 16-bit floating-point values.
+ ///
+ public struct HalfVector4 : IPackedPixel, IEquatable
+ {
+ ///
+ /// The maximum byte value.
+ ///
+ private static readonly Vector4 MaxBytes = new Vector4(255);
+
+ ///
+ /// The half vector value.
+ ///
+ private static readonly Vector4 Half = new Vector4(0.5F);
+
+ ///
+ /// Initializes a new instance of the struct.
+ ///
+ /// The x-component.
+ /// The y-component.
+ /// The z-component.
+ /// The w-component.
+ public HalfVector4(float x, float y, float z, float w)
+ {
+ var vector = new Vector4(x, y, z, w);
+ this.PackedValue = PackHelper(ref vector);
+ }
+
+ ///
+ /// Initializes a new instance of the struct.
+ ///
+ /// A vector containing the initial values for the components
+ public HalfVector4(Vector4 vector)
+ {
+ this.PackedValue = PackHelper(ref vector);
+ }
+
+ ///
+ public ulong PackedValue { get; set; }
+
+ ///
+ /// Compares two objects for equality.
+ ///
+ ///
+ /// The on the left side of the operand.
+ ///
+ ///
+ /// The on the right side of the operand.
+ ///
+ ///
+ /// True if the parameter is equal to the parameter; otherwise, false.
+ ///
+ public static bool operator ==(HalfVector4 left, HalfVector4 right)
+ {
+ return left.Equals(right);
+ }
+
+ ///
+ /// Compares two objects for equality.
+ ///
+ ///
+ /// The on the left side of the operand.
+ ///
+ ///
+ /// The on the right side of the operand.
+ ///
+ ///
+ /// True if the parameter is not equal to the parameter; otherwise, false.
+ ///
+ public static bool operator !=(HalfVector4 left, HalfVector4 right)
+ {
+ return !left.Equals(right);
+ }
+
+ ///
+ public void PackFromVector4(Vector4 vector)
+ {
+ this.PackedValue = PackHelper(ref vector);
+ }
+
+ ///
+ public Vector4 ToVector4()
+ {
+ return new Vector4(
+ HalfTypeHelper.Unpack((ushort)this.PackedValue),
+ HalfTypeHelper.Unpack((ushort)(this.PackedValue >> 0x10)),
+ HalfTypeHelper.Unpack((ushort)(this.PackedValue >> 0x20)),
+ HalfTypeHelper.Unpack((ushort)(this.PackedValue >> 0x30)));
+ }
+
+ ///
+ public void PackFromBytes(byte x, byte y, byte z, byte w)
+ {
+ this.PackFromVector4(new Vector4(x, y, z, w) / MaxBytes);
+ }
+
+ ///
+ public void ToBytes(byte[] bytes, int startIndex, ComponentOrder componentOrder)
+ {
+ Vector4 vector = this.ToVector4();
+ vector *= MaxBytes;
+ vector += Half;
+ vector = Vector4.Clamp(vector, Vector4.Zero, MaxBytes);
+
+ switch (componentOrder)
+ {
+ case ComponentOrder.ZYX:
+ bytes[startIndex] = (byte)vector.Z;
+ bytes[startIndex + 1] = (byte)vector.Y;
+ bytes[startIndex + 2] = (byte)vector.X;
+ break;
+ case ComponentOrder.ZYXW:
+ bytes[startIndex] = (byte)vector.Z;
+ bytes[startIndex + 1] = (byte)vector.Y;
+ bytes[startIndex + 2] = (byte)vector.X;
+ bytes[startIndex + 3] = (byte)vector.W;
+ break;
+ case ComponentOrder.XYZ:
+ bytes[startIndex] = (byte)vector.X;
+ bytes[startIndex + 1] = (byte)vector.Y;
+ bytes[startIndex + 2] = (byte)vector.Z;
+ break;
+ case ComponentOrder.XYZW:
+ bytes[startIndex] = (byte)vector.X;
+ bytes[startIndex + 1] = (byte)vector.Y;
+ bytes[startIndex + 2] = (byte)vector.Z;
+ bytes[startIndex + 3] = (byte)vector.W;
+ break;
+ default:
+ throw new NotSupportedException();
+ }
+ }
+
+ ///
+ public override string ToString()
+ {
+ return this.ToVector4().ToString();
+ }
+
+ ///
+ public override int GetHashCode()
+ {
+ return this.PackedValue.GetHashCode();
+ }
+
+ ///
+ public override bool Equals(object obj)
+ {
+ return (obj is HalfVector4) && this.Equals((HalfVector4)obj);
+ }
+
+ ///
+ public bool Equals(HalfVector4 other)
+ {
+ return this.PackedValue.Equals(other.PackedValue);
+ }
+
+ ///
+ /// Packs a into a .
+ ///
+ /// The vector containing the values to pack.
+ /// The containing the packed values.
+ private static ulong PackHelper(ref Vector4 vector)
+ {
+ ulong num4 = HalfTypeHelper.Pack(vector.X);
+ ulong num3 = (ulong)HalfTypeHelper.Pack(vector.Y) << 0x10;
+ ulong num2 = (ulong)HalfTypeHelper.Pack(vector.Z) << 0x20;
+ ulong num1 = (ulong)HalfTypeHelper.Pack(vector.W) << 0x30;
+ return num4 | num3 | num2 | num1;
+ }
+ }
+}
\ No newline at end of file
diff --git a/tests/ImageSharp.Tests/Colors/PackedPixelTests.cs b/tests/ImageSharp.Tests/Colors/PackedPixelTests.cs
index dcb4b164d8..cadc8deda7 100644
--- a/tests/ImageSharp.Tests/Colors/PackedPixelTests.cs
+++ b/tests/ImageSharp.Tests/Colors/PackedPixelTests.cs
@@ -322,6 +322,52 @@ namespace ImageSharp.Tests.Colors
Assert.Equal(bgra, new byte[] { 0, 64, 128, 255 });
}
+ [Fact]
+ public void HalfVector4()
+ {
+ // Test PackedValue
+ Assert.Equal(0uL, new HalfVector4(Vector4.Zero).PackedValue);
+ Assert.Equal(4323521613979991040uL, new HalfVector4(Vector4.One).PackedValue);
+ Assert.Equal(13547034390470638592uL, new HalfVector4(-Vector4.One).PackedValue);
+ Assert.Equal(15360uL, new HalfVector4(Vector4.UnitX).PackedValue);
+ Assert.Equal(1006632960uL, new HalfVector4(Vector4.UnitY).PackedValue);
+ Assert.Equal(65970697666560uL, new HalfVector4(Vector4.UnitZ).PackedValue);
+ Assert.Equal(4323455642275676160uL, new HalfVector4(Vector4.UnitW).PackedValue);
+ Assert.Equal(4035285078724390502uL, new HalfVector4(0.1f, 0.3f, 0.4f, 0.5f).PackedValue);
+
+ // Test ToVector4
+ Assert.True(Equal(Vector4.Zero, new HalfVector4(Vector4.Zero).ToVector4()));
+ Assert.True(Equal(Vector4.One, new HalfVector4(Vector4.One).ToVector4()));
+ Assert.True(Equal(-Vector4.One, new HalfVector4(-Vector4.One).ToVector4()));
+ Assert.True(Equal(Vector4.UnitX, new HalfVector4(Vector4.UnitX).ToVector4()));
+ Assert.True(Equal(Vector4.UnitY, new HalfVector4(Vector4.UnitY).ToVector4()));
+ Assert.True(Equal(Vector4.UnitZ, new HalfVector4(Vector4.UnitZ).ToVector4()));
+ Assert.True(Equal(Vector4.UnitW, new HalfVector4(Vector4.UnitW).ToVector4()));
+
+ // Test ordering
+ float x = .25F;
+ float y = .5F;
+ float z = .75F;
+ float w = 1F;
+
+ byte[] rgb = new byte[3];
+ byte[] rgba = new byte[4];
+ byte[] bgr = new byte[3];
+ byte[] bgra = new byte[4];
+
+ new HalfVector4(x, y, z, w).ToBytes(rgb, 0, ComponentOrder.XYZ);
+ Assert.Equal(rgb, new byte[] { 64, 128, 191 });
+
+ new HalfVector4(x, y, z, w).ToBytes(rgba, 0, ComponentOrder.XYZW);
+ Assert.Equal(rgba, new byte[] { 64, 128, 191, 255 });
+
+ new HalfVector4(x, y, z, w).ToBytes(bgr, 0, ComponentOrder.ZYX);
+ Assert.Equal(bgr, new byte[] { 191, 128, 64 });
+
+ new HalfVector4(x, y, z, w).ToBytes(bgra, 0, ComponentOrder.ZYXW);
+ Assert.Equal(bgra, new byte[] { 191, 128, 64, 255 });
+ }
+
// Comparison helpers with small tolerance to allow for floating point rounding during computations.
public static bool Equal(float a, float b)
{
diff --git a/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs b/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
index 24ff333611..641f30bfe9 100644
--- a/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
+++ b/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
@@ -57,6 +57,8 @@ namespace ImageSharp.Tests
// Image image = file.CreateImage().To();
// Image image = file.CreateImage().To();
// Image image = file.CreateImage().To();
+ // Image image = file.CreateImage().To();
+ // Image image = file.CreateImage().To();
using (FileStream output = File.OpenWrite($"{path}/{file.FileName}"))
{