Inline filters

src/ImageSharp.Formats.Png/Filters/AverageFilter.cs

@@ -5,6 +5,8 @@
 
 namespace ImageSharp.Formats
 {
+    using System.Runtime.CompilerServices;
+
     /// <summary>
     /// The Average filter uses the average of the two neighboring pixels (left and above) to predict
     /// the value of a pixel.
@@ -19,6 +21,7 @@ namespace ImageSharp.Formats
         /// <param name="previousScanline">The previous scanline.</param>
         /// <param name="bytesPerScanline">The number of bytes per scanline</param>
         /// <param name="bytesPerPixel">The bytes per pixel.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void Decode(byte[] scanline, byte[] previousScanline, int bytesPerScanline, int bytesPerPixel)
         {
             // Average(x) + floor((Raw(x-bpp)+Prior(x))/2)
@@ -42,6 +45,7 @@ namespace ImageSharp.Formats
         /// <param name="previousScanline">The previous scanline.</param>
         /// <param name="result">The filtered scanline result.</param>
         /// <param name="bytesPerPixel">The bytes per pixel.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void Encode(byte[] scanline, byte[] previousScanline, byte[] result, int bytesPerPixel)
         {
             // Average(x) = Raw(x) - floor((Raw(x-bpp)+Prior(x))/2)
@@ -67,6 +71,7 @@ namespace ImageSharp.Formats
         /// <param name="left">The left byte</param>
         /// <param name="above">The above byte</param>
         /// <returns>The <see cref="int"/></returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         private static int Average(byte left, byte above)
         {
             return (left + above) >> 1;

src/ImageSharp.Formats.Png/Filters/NoneFilter.cs

@@ -6,6 +6,7 @@
 namespace ImageSharp.Formats
 {
     using System;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// The None filter, the scanline is transmitted unmodified; it is only necessary to
@@ -19,6 +20,7 @@ namespace ImageSharp.Formats
         /// </summary>
         /// <param name="scanline">The scanline to decode</param>
         /// <returns>The <see cref="T:byte[]"/></returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static byte[] Decode(byte[] scanline)
         {
             // No change required.
@@ -30,6 +32,7 @@ namespace ImageSharp.Formats
         /// </summary>
         /// <param name="scanline">The scanline to encode</param>
         /// <param name="result">The filtered scanline result.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void Encode(byte[] scanline, byte[] result)
         {
             // Insert a byte before the data.

src/ImageSharp.Formats.Png/Filters/PaethFilter.cs

@@ -6,6 +6,7 @@
 namespace ImageSharp.Formats
 {
     using System;
+    using System.Runtime.CompilerServices;
 
     /// <summary>
     /// The Paeth filter computes a simple linear function of the three neighboring pixels (left, above, upper left),
@@ -22,6 +23,7 @@ namespace ImageSharp.Formats
         /// <param name="previousScanline">The previous scanline.</param>
         /// <param name="bytesPerScanline">The number of bytes per scanline</param>
         /// <param name="bytesPerPixel">The bytes per pixel.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void Decode(byte[] scanline, byte[] previousScanline, int bytesPerScanline, int bytesPerPixel)
         {
             // Paeth(x) + PaethPredictor(Raw(x-bpp), Prior(x), Prior(x-bpp))
@@ -46,6 +48,7 @@ namespace ImageSharp.Formats
         /// <param name="previousScanline">The previous scanline.</param>
         /// <param name="result">The filtered scanline result.</param>
         /// <param name="bytesPerPixel">The bytes per pixel.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void Encode(byte[] scanline, byte[] previousScanline, byte[] result, int bytesPerPixel)
         {
             // Paeth(x) = Raw(x) - PaethPredictor(Raw(x-bpp), Prior(x), Prior(x - bpp))
@@ -76,6 +79,7 @@ namespace ImageSharp.Formats
         /// <returns>
         /// The <see cref="byte"/>.
         /// </returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         private static byte PaethPredicator(byte left, byte above, byte upperLeft)
         {
             int p = left + above - upperLeft;

src/ImageSharp.Formats.Png/Filters/SubFilter.cs

@@ -5,6 +5,8 @@
 
 namespace ImageSharp.Formats
 {
+    using System.Runtime.CompilerServices;
+
     /// <summary>
     /// The Sub filter transmits the difference between each byte and the value of the corresponding byte
     /// of the prior pixel.
@@ -18,6 +20,7 @@ namespace ImageSharp.Formats
         /// <param name="scanline">The scanline to decode</param>
         /// <param name="bytesPerScanline">The number of bytes per scanline</param>
         /// <param name="bytesPerPixel">The bytes per pixel.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void Decode(byte[] scanline, int bytesPerScanline, int bytesPerPixel)
         {
             // Sub(x) + Raw(x-bpp)
@@ -37,6 +40,7 @@ namespace ImageSharp.Formats
         /// <param name="scanline">The scanline to encode</param>
         /// <param name="result">The filtered scanline result.</param>
         /// <param name="bytesPerPixel">The bytes per pixel.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void Encode(byte[] scanline, byte[] result, int bytesPerPixel)
         {
             // Sub(x) = Raw(x) - Raw(x-bpp)

src/ImageSharp.Formats.Png/Filters/UpFilter.cs

@@ -5,6 +5,8 @@
 
 namespace ImageSharp.Formats
 {
+    using System.Runtime.CompilerServices;
+
     /// <summary>
     /// The Up filter is just like the Sub filter except that the pixel immediately above the current pixel,
     /// rather than just to its left, is used as the predictor.
@@ -18,6 +20,7 @@ namespace ImageSharp.Formats
         /// <param name="scanline">The scanline to decode</param>
         /// <param name="previousScanline">The previous scanline.</param>
         /// <param name="bytesPerScanline">The number of bytes per scanline</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void Decode(byte[] scanline, byte[] previousScanline, int bytesPerScanline)
         {
             // Up(x) + Prior(x)
@@ -39,6 +42,7 @@ namespace ImageSharp.Formats
         /// <param name="scanline">The scanline to encode</param>
         /// <param name="previousScanline">The previous scanline.</param>
         /// <param name="result">The filtered scanline result.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void Encode(byte[] scanline, byte[] previousScanline, byte[] result)
         {
             // Up(x) = Raw(x) - Prior(x)