diff --git a/src/ImageSharp/Colors/PackedPixel/Rgba64.cs b/src/ImageSharp/Colors/PackedPixel/Rgba64.cs
new file mode 100644
index 000000000..3744fb1ec
--- /dev/null
+++ b/src/ImageSharp/Colors/PackedPixel/Rgba64.cs
@@ -0,0 +1,170 @@
+//
+// 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 unsigned normalized values ranging from 0 to 1.
+ ///
+ public struct Rgba64 : IPackedPixel, IEquatable, IPackedVector
+ {
+ ///
+ /// Initializes a new instance of the struct.
+ ///
+ /// The x-component
+ /// The y-component
+ /// The z-component
+ /// The w-component
+ public Rgba64(float x, float y, float z, float w)
+ {
+ this.PackedValue = Pack(x, y, z, w);
+ }
+
+ ///
+ /// Initializes a new instance of the struct.
+ ///
+ /// The vector containing the components values.
+ public Rgba64(Vector4 vector)
+ {
+ this.PackedValue = Pack(vector.X, vector.Y, vector.Z, vector.W);
+ }
+
+ ///
+ 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 ==(Rgba64 left, Rgba64 right)
+ {
+ return left.PackedValue == right.PackedValue;
+ }
+
+ ///
+ /// 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 !=(Rgba64 left, Rgba64 right)
+ {
+ return left.PackedValue != right.PackedValue;
+ }
+
+ ///
+ public Vector4 ToVector4()
+ {
+ return new Vector4(
+ (this.PackedValue & 0xFFFF) / 65535F,
+ ((this.PackedValue >> 16) & 0xFFFF) / 65535F,
+ ((this.PackedValue >> 32) & 0xFFFF) / 65535F,
+ ((this.PackedValue >> 48) & 0xFFFF) / 65535F);
+ }
+
+ ///
+ public void PackFromVector4(Vector4 vector)
+ {
+ this.PackedValue = Pack(vector.X, vector.Y, vector.Z, vector.W);
+ }
+
+ ///
+ public void PackFromBytes(byte x, byte y, byte z, byte w)
+ {
+ this.PackFromVector4(new Vector4(x, y, z, w) / 255F);
+ }
+
+ ///
+ public void ToBytes(byte[] bytes, int startIndex, ComponentOrder componentOrder)
+ {
+ Vector4 vector = this.ToVector4() * 255F;
+
+ switch (componentOrder)
+ {
+ case ComponentOrder.ZYX:
+ bytes[startIndex] = (byte)(float)Math.Round(vector.Z);
+ bytes[startIndex + 1] = (byte)(float)Math.Round(vector.Y);
+ bytes[startIndex + 2] = (byte)(float)Math.Round(vector.X);
+ break;
+ case ComponentOrder.ZYXW:
+ bytes[startIndex] = (byte)(float)Math.Round(vector.Z);
+ bytes[startIndex + 1] = (byte)(float)Math.Round(vector.Y);
+ bytes[startIndex + 2] = (byte)(float)Math.Round(vector.X);
+ bytes[startIndex + 3] = (byte)(float)Math.Round(vector.W);
+ break;
+ case ComponentOrder.XYZ:
+ bytes[startIndex] = (byte)(float)Math.Round(vector.X);
+ bytes[startIndex + 1] = (byte)(float)Math.Round(vector.Y);
+ bytes[startIndex + 2] = (byte)(float)Math.Round(vector.Z);
+ break;
+ case ComponentOrder.XYZW:
+ bytes[startIndex] = (byte)(float)Math.Round(vector.X);
+ bytes[startIndex + 1] = (byte)(float)Math.Round(vector.Y);
+ bytes[startIndex + 2] = (byte)(float)Math.Round(vector.Z);
+ bytes[startIndex + 3] = (byte)(float)Math.Round(vector.W);
+ break;
+ default:
+ throw new NotSupportedException();
+ }
+ }
+
+ ///
+ public override bool Equals(object obj)
+ {
+ return (obj is Rgba64) && this.Equals((Rgba64)obj);
+ }
+
+ ///
+ public bool Equals(Rgba64 other)
+ {
+ return this.PackedValue == other.PackedValue;
+ }
+
+ ///
+ public override string ToString()
+ {
+ return this.ToVector4().ToString();
+ }
+
+ ///
+ public override int GetHashCode()
+ {
+ return this.PackedValue.GetHashCode();
+ }
+
+ ///
+ /// Packs the components into a .
+ ///
+ /// The x-component
+ /// The y-component
+ /// The z-component
+ /// The w-component
+ /// The containing the packed values.
+ private static ulong Pack(float x, float y, float z, float w)
+ {
+ return (ulong)Math.Round(x.Clamp(0, 1) * 65535F) |
+ ((ulong)Math.Round(y.Clamp(0, 1) * 65535F) << 16) |
+ ((ulong)Math.Round(z.Clamp(0, 1) * 65535F) << 32) |
+ ((ulong)Math.Round(w.Clamp(0, 1) * 65535F) << 48);
+ }
+ }
+}
diff --git a/tests/ImageSharp.Tests/Colors/PackedPixelTests.cs b/tests/ImageSharp.Tests/Colors/PackedPixelTests.cs
index 1c6f90970..58d9d56d7 100644
--- a/tests/ImageSharp.Tests/Colors/PackedPixelTests.cs
+++ b/tests/ImageSharp.Tests/Colors/PackedPixelTests.cs
@@ -657,6 +657,54 @@ namespace ImageSharp.Tests.Colors
Assert.Equal(rgba, new byte[] { 25, 0, 128, 0 });
}
+ [Fact]
+ public void Rgba64()
+ {
+ // Test the limits.
+ Assert.Equal((ulong)0x0, new Rgba64(Vector4.Zero).PackedValue);
+ Assert.Equal(0xFFFFFFFFFFFFFFFF, new Rgba64(Vector4.One).PackedValue);
+
+ // Test ToVector4
+ Assert.True(Equal(Vector4.Zero, new Rgba64(Vector4.Zero).ToVector4()));
+ Assert.True(Equal(Vector4.One, new Rgba64(Vector4.One).ToVector4()));
+
+ // Test clamping.
+ Assert.True(Equal(Vector4.Zero, new Rgba64(Vector4.One * -1234.0f).ToVector4()));
+ Assert.True(Equal(Vector4.One, new Rgba64(Vector4.One * 1234.0f).ToVector4()));
+
+ // Test data ordering
+ Assert.Equal(0xC7AD8F5C570A1EB8, new Rgba64(((float)0x1EB8) / 0xffff, ((float)0x570A) / 0xffff, ((float)0x8F5C) / 0xffff, ((float)0xC7AD) / 0xffff).PackedValue);
+ Assert.Equal(0xC7AD8F5C570A1EB8, new Rgba64(0.12f, 0.34f, 0.56f, 0.78f).PackedValue);
+
+ float x = 0.08f;
+ float y = 0.15f;
+ float z = 0.30f;
+ float w = 0.45f;
+ Assert.Equal((ulong)0x73334CCC2666147B, new Rgba64(x, y, z, w).PackedValue);
+
+ byte[] rgb = new byte[3];
+ byte[] rgba = new byte[4];
+ byte[] bgr = new byte[3];
+ byte[] bgra = new byte[4];
+
+ new Rgba64(x, y, z, w).ToBytes(rgb, 0, ComponentOrder.XYZ);
+ Assert.Equal(rgb, new byte[] { 20, 38, 76 });
+
+ new Rgba64(x, y, z, w).ToBytes(rgba, 0, ComponentOrder.XYZW);
+ Assert.Equal(rgba, new byte[] { 20, 38, 76, 115 });
+
+ new Rgba64(x, y, z, w).ToBytes(bgr, 0, ComponentOrder.ZYX);
+ Assert.Equal(bgr, new byte[] { 76, 38, 20 });
+
+ new Rgba64(x, y, z, w).ToBytes(bgra, 0, ComponentOrder.ZYXW);
+ Assert.Equal(bgra, new byte[] { 76, 38, 20, 115 });
+
+ Rgba64 r = new Rgba64();
+ r.PackFromBytes(20, 38, 76, 115);
+ r.ToBytes(rgba, 0, ComponentOrder.XYZW);
+ Assert.Equal(rgba, new byte[] { 20, 38, 76, 115 });
+ }
+
// 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 6c95951d8..16a60d190 100644
--- a/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
+++ b/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
@@ -63,6 +63,7 @@ namespace ImageSharp.Tests
// Image image = file.CreateImage().To();
// Image image = file.CreateImage().To();
// Image image = file.CreateImage().To();
+ // Image image = file.CreateImage().To();
// TODO: Conversion between types who's vector ranges are different are not possible without scaling function, Make static version of known ones.
// Image image = file.CreateImage().To(v => (2F * v) - Vector4.One);