diff --git a/src/ImageSharp/Colors/PackedPixel/Bgra5551.cs b/src/ImageSharp/Colors/PackedPixel/Bgra5551.cs
new file mode 100644
index 000000000..bf3febb50
--- /dev/null
+++ b/src/ImageSharp/Colors/PackedPixel/Bgra5551.cs
@@ -0,0 +1,171 @@
+//
+// 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 unsigned normalized values ranging from 0 to 1. The x , y and z components use 5 bits, and the w component uses 1 bit.
+ ///
+ public struct Bgra5551 : IPackedPixel, IEquatable, IPackedVector
+ {
+ ///
+ /// Initializes a new instance of the struct.
+ ///
+ /// The x-component
+ /// The y-component
+ /// The z-component
+ /// The w-component
+ public Bgra5551(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 for the packed vector.
+ ///
+ public Bgra5551(Vector4 vector)
+ {
+ this.PackedValue = Pack(vector.X, vector.Y, vector.Z, vector.W);
+ }
+
+ ///
+ public ushort 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 ==(Bgra5551 left, Bgra5551 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 !=(Bgra5551 left, Bgra5551 right)
+ {
+ return left.PackedValue != right.PackedValue;
+ }
+
+ ///
+ public Vector4 ToVector4()
+ {
+ return new Vector4(
+ ((this.PackedValue >> 10) & 0x1F) / 31F,
+ ((this.PackedValue >> 5) & 0x1F) / 31F,
+ ((this.PackedValue >> 0) & 0x1F) / 31F,
+ (this.PackedValue >> 15) & 0x01);
+ }
+
+ ///
+ 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)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 bool Equals(object obj)
+ {
+ return (obj is Bgra5551) && this.Equals((Bgra5551)obj);
+ }
+
+ ///
+ public bool Equals(Bgra5551 other)
+ {
+ return this.PackedValue == other.PackedValue;
+ }
+
+ ///
+ /// Gets a string representation of the packed vector.
+ ///
+ /// A string representation of the packed vector.
+ public override string ToString()
+ {
+ return this.ToVector4().ToString();
+ }
+
+ ///
+ /// Gets a hash code of the packed vector.
+ ///
+ /// The hash code for the packed vector.
+ 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 ushort Pack(float x, float y, float z, float w)
+ {
+ return (ushort)(
+ (((int)Math.Round(x.Clamp(0, 1) * 31F) & 0x1F) << 10) |
+ (((int)Math.Round(y.Clamp(0, 1) * 31F) & 0x1F) << 5) |
+ (((int)Math.Round(z.Clamp(0, 1) * 31F) & 0x1F) << 0) |
+ (((int)Math.Round(w.Clamp(0, 1)) & 0x1) << 15));
+ }
+ }
+}
diff --git a/tests/ImageSharp.Tests/Colors/PackedVectorTests.cs b/tests/ImageSharp.Tests/Colors/PackedVectorTests.cs
index 0f1b537de..b24381ace 100644
--- a/tests/ImageSharp.Tests/Colors/PackedVectorTests.cs
+++ b/tests/ImageSharp.Tests/Colors/PackedVectorTests.cs
@@ -154,6 +154,52 @@ namespace ImageSharp.Tests.Colors
Assert.Equal(bgra, new byte[] { 136, 0, 34, 0 });
}
+ [Fact]
+ public void Bgra5551()
+ {
+ // Test the limits.
+ Assert.Equal(0x0, new Bgra5551(Vector4.Zero).PackedValue);
+ Assert.Equal(0xFFFF, new Bgra5551(Vector4.One).PackedValue);
+
+ // Test ToVector4
+ Assert.True(Equal(Vector4.Zero, new Bgra5551(Vector4.Zero).ToVector4()));
+ Assert.True(Equal(Vector4.One, new Bgra5551(Vector4.One).ToVector4()));
+
+ // Test clamping.
+ Assert.Equal(Vector4.Zero, new Bgra5551(Vector4.One * -1234.0f).ToVector4());
+ Assert.Equal(Vector4.One, new Bgra5551(Vector4.One * 1234.0f).ToVector4());
+
+ // Test Ordering
+ float x = 0x1a;
+ float y = 0x16;
+ float z = 0xd;
+ float w = 0x1;
+ Assert.Equal(0xeacd, new Bgra5551(x / 0x1f, y / 0x1f, z / 0x1f, w).PackedValue);
+ x = 0.1f;
+ y = -0.3f;
+ z = 0.5f;
+ w = -0.7f;
+ Assert.Equal(3088, new Bgra5551(x, y, z, w).PackedValue);
+
+ // Test ordering
+ byte[] rgb = new byte[3];
+ byte[] rgba = new byte[4];
+ byte[] bgr = new byte[3];
+ byte[] bgra = new byte[4];
+
+ new Bgra5551(x, y, z, w).ToBytes(rgb, 0, ComponentOrder.XYZ);
+ Assert.Equal(rgb, new byte[] { 24, 0, 131 });
+
+ new Bgra5551(x, y, z, w).ToBytes(rgba, 0, ComponentOrder.XYZW);
+ Assert.Equal(rgba, new byte[] { 24, 0, 131, 0 });
+
+ new Bgra5551(x, y, z, w).ToBytes(bgr, 0, ComponentOrder.ZYX);
+ Assert.Equal(bgr, new byte[] { 131, 0, 24 });
+
+ new Bgra5551(x, y, z, w).ToBytes(bgra, 0, ComponentOrder.ZYXW);
+ Assert.Equal(bgra, new byte[] { 131, 0, 24, 0 });
+ }
+
// 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 77057cd7b..db4f3c466 100644
--- a/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
+++ b/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
@@ -54,6 +54,7 @@ namespace ImageSharp.Tests
Image image = file.CreateImage();
// Image image = file.CreateImage().To();
// Image image = file.CreateImage().To();
+ // Image image = file.CreateImage().To();
using (FileStream output = File.OpenWrite($"{path}/{file.FileName}"))
{