Inline ToVector4()

10ms faster resize benchmark on my machine.

src/ImageSharp/Colors/Color.cs

@@ -8,6 +8,7 @@ namespace ImageSharp
     using System;
     using System.Globalization;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed pixel type containing four 8-bit unsigned normalized values ranging from 0 to 255.
@@ -313,6 +314,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc/>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             return new Vector4(this.R, this.G, this.B, this.A) / MaxBytes;

src/ImageSharp/Colors/PackedPixel/Alpha8.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed pixel type containing a single 8 bit normalized W values that is ranging from 0 to 1.
@@ -62,6 +63,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             return new Vector4(0, 0, 0, this.PackedValue / 255F);

src/ImageSharp/Colors/PackedPixel/Argb.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed pixel type containing four 8-bit unsigned normalized values ranging from 0 to 255.
@@ -209,6 +210,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc/>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             return new Vector4(this.R, this.G, this.B, this.A) / MaxBytes;

src/ImageSharp/Colors/PackedPixel/Bgr565.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <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.
@@ -84,6 +85,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             return new Vector4(this.ToVector3(), 1F);

src/ImageSharp/Colors/PackedPixel/Bgra4444.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed pixel type containing unsigned normalized values, ranging from 0 to 1, using 4 bits each for x, y, z, and w.
@@ -64,6 +65,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             const float Max = 1 / 15F;

src/ImageSharp/Colors/PackedPixel/Bgra5551.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <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.
@@ -66,6 +67,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             return new Vector4(

src/ImageSharp/Colors/PackedPixel/Byte4.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed pixel type containing four 8-bit unsigned integer values, ranging from 0 to 255.
@@ -66,19 +67,14 @@ namespace ImageSharp
             return left.PackedValue != right.PackedValue;
         }
 
-        /// <summary>
-        /// Sets the packed representation from a Vector4.
-        /// </summary>
-        /// <param name="vector">The vector to create the packed representation from.</param>
+        /// <inheritdoc />
         public void PackFromVector4(Vector4 vector)
         {
             this.PackedValue = Pack(ref vector);
         }
 
-        /// <summary>
-        /// Expands the packed representation into a Vector4.
-        /// </summary>
-        /// <returns>The expanded vector.</returns>
+        /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             return new Vector4(

src/ImageSharp/Colors/PackedPixel/HalfSingle.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed pixel type containing a single 16 bit floating point value.
@@ -85,6 +86,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             return new Vector4(this.ToSingle(), 0, 0, 1);

src/ImageSharp/Colors/PackedPixel/HalfVector2.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed pixel type containing two 16-bit floating-point values.
@@ -98,6 +99,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             Vector2 vector = this.ToVector2();

src/ImageSharp/Colors/PackedPixel/HalfVector4.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed pixel type containing four 16-bit floating-point values.
@@ -89,6 +90,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             return new Vector4(

src/ImageSharp/Colors/PackedPixel/NormalizedByte2.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed packed pixel type containing two 8-bit signed normalized values, ranging from −1 to 1.
@@ -103,6 +104,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             return new Vector4(this.ToVector2(), 0F, 1F);

src/ImageSharp/Colors/PackedPixel/NormalizedByte4.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed pixel type containing four 8-bit signed normalized values, ranging from −1 to 1.
@@ -93,6 +94,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             return new Vector4(

src/ImageSharp/Colors/PackedPixel/NormalizedShort2.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed pixel type containing two 16-bit signed normalized values, ranging from −1 to 1.
@@ -91,6 +92,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             return new Vector4(this.ToVector2(), 0, 1);

src/ImageSharp/Colors/PackedPixel/NormalizedShort4.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Numerics;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// Packed pixel type containing four 16-bit signed normalized values, ranging from −1 to 1.
@@ -93,6 +94,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public Vector4 ToVector4()
         {
             const float MaxVal = 0x7FFF;