All tests now pass

src/ImageSharp/Formats/Png/PngEncoderCore.cs

@@ -5,8 +5,6 @@ using System;
 using System.Buffers.Binary;
 using System.IO;
 using System.Linq;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
 using SixLabors.ImageSharp.Advanced;
 using SixLabors.ImageSharp.Formats.Png.Filters;
 using SixLabors.ImageSharp.Formats.Png.Zlib;
@@ -394,7 +392,6 @@ namespace SixLabors.ImageSharp.Formats.Png
             switch (this.pngColorType)
             {
                 case PngColorType.Palette:
-                    // TODO: Use Span copy!
                     Buffer.BlockCopy(this.palettePixelData, row * this.rawScanline.Length(), this.rawScanline.Array, 0, this.rawScanline.Length());
                     break;
                 case PngColorType.Grayscale:
@@ -646,12 +643,37 @@ namespace SixLabors.ImageSharp.Formats.Png
             this.rawScanline = this.memoryAllocator.AllocateCleanManagedByteBuffer(this.bytesPerScanline);
             this.result = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
 
-            if (this.pngColorType != PngColorType.Palette)
+            switch (this.pngFilterMethod)
             {
-                this.sub = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
-                this.up = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
-                this.average = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
-                this.paeth = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
+                case PngFilterMethod.None:
+                    break;
+
+                case PngFilterMethod.Sub:
+
+                    this.sub = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
+                    break;
+
+                case PngFilterMethod.Up:
+
+                    this.up = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
+                    break;
+
+                case PngFilterMethod.Average:
+
+                    this.average = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
+                    break;
+
+                case PngFilterMethod.Paeth:
+
+                    this.paeth = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
+                    break;
+                case PngFilterMethod.Adaptive:
+
+                    this.sub = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
+                    this.up = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
+                    this.average = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
+                    this.paeth = this.memoryAllocator.AllocateCleanManagedByteBuffer(resultLength);
+                    break;
             }
 
             byte[] buffer;

tests/ImageSharp.Tests/Drawing/Text/DrawTextOnImageTests.cs

@@ -84,12 +84,13 @@ namespace SixLabors.ImageSharp.Tests.Drawing.Text
             }
 
             var textOptions = new TextGraphicsOptions
-                                  {
-                                      Antialias = true,
-                                      ApplyKerning = true,
-                                      VerticalAlignment = VerticalAlignment.Top,
-                                      HorizontalAlignment = HorizontalAlignment.Left,
-                                  };
+            {
+                Antialias = true,
+                ApplyKerning = true,
+                VerticalAlignment = VerticalAlignment.Top,
+                HorizontalAlignment = HorizontalAlignment.Left,
+            };
+
             TPixel color = NamedColors<TPixel>.Black;
 
             provider.VerifyOperation(

tests/ImageSharp.Tests/TestUtilities/Tests/TestEnvironmentTests.cs

@@ -60,7 +60,7 @@ namespace SixLabors.ImageSharp.Tests
         }
 
         [Theory]
-        [InlineData("lol/foo.png", typeof(SystemDrawingReferenceEncoder))]
+        [InlineData("lol/foo.png", typeof(PngEncoder))]
         [InlineData("lol/Rofl.bmp", typeof(SystemDrawingReferenceEncoder))]
         [InlineData("lol/Baz.JPG", typeof(JpegEncoder))]
         [InlineData("lol/Baz.gif", typeof(GifEncoder))]
@@ -73,7 +73,7 @@ namespace SixLabors.ImageSharp.Tests
         }
 
         [Theory]
-        [InlineData("lol/foo.png", typeof(SystemDrawingReferenceDecoder))]
+        [InlineData("lol/foo.png", typeof(PngDecoder))]
         [InlineData("lol/Rofl.bmp", typeof(SystemDrawingReferenceDecoder))]
         [InlineData("lol/Baz.JPG", typeof(JpegDecoder))]
         [InlineData("lol/Baz.gif", typeof(GifDecoder))]

tests/Images/External

@@ -1 +1 @@
-Subproject commit 0e6407be7081341526f815a4d70e7912db276a98
+Subproject commit 147306294437dc03f6e640f5db2dcd496a43ced7