Compare to reference output, when reference decoder is not an option

tests/ImageSharp.Tests/Formats/Bmp/BmpDecoderTests.cs

@@ -304,8 +304,9 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
             {
                 image.DebugSave(provider);
 
-                // TODO: Neither System.Drawing nor MagickReferenceDecoder decode this file.
-                // image.CompareToOriginal(provider);
+                // Neither System.Drawing nor MagickReferenceDecoder decode this file.
+                // Compare to reference output instead.
+                image.CompareToReferenceOutput(provider, extension: "png");
             }
         }
 
@@ -318,8 +319,9 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
             {
                 image.DebugSave(provider);
 
-                // TODO: Neither System.Drawing nor MagickReferenceDecoder decode this file.
-                // image.CompareToOriginal(provider);
+                // Neither System.Drawing nor MagickReferenceDecoder decode this file.
+                // Compare to reference output instead.
+                image.CompareToReferenceOutput(provider, extension: "png");
             }
         }
 
@@ -592,8 +594,9 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
             {
                 image.DebugSave(provider);
 
-                // TODO: Neither System.Drawing or MagickReferenceDecoder can correctly decode this file.
-                // image.CompareToOriginal(provider);
+                // Neither System.Drawing or MagickReferenceDecoder can correctly decode this file.
+                // Compare to reference output instead.
+                image.CompareToReferenceOutput(provider, extension: "png");
             }
         }
 
@@ -606,10 +609,9 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
             {
                 image.DebugSave(provider);
 
-                // TODO: System.Drawing can not decode this image. MagickReferenceDecoder can decode it,
-                // but i think incorrectly. I have loaded the image with GIMP and exported as PNG.
-                // The results are the same as the image sharp implementation.
-                // image.CompareToOriginal(provider, new MagickReferenceDecoder());
+                // System.Drawing can not decode this image. MagickReferenceDecoder can decode it,
+                // Compare to reference output instead.
+                image.CompareToReferenceOutput(provider, extension: "png");
             }
         }
 
@@ -630,8 +632,9 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
             {
                 image.DebugSave(provider);
 
-                // TODO: Neither System.Drawing or MagickReferenceDecoder can correctly decode this file.
-                // image.CompareToOriginal(provider);
+                // Neither System.Drawing or MagickReferenceDecoder can correctly decode this file.
+                // Compare to reference output instead.
+                image.CompareToReferenceOutput(provider, extension: "png");
             }
         }
     }

tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecodeAlphaBitfields_Rgba32_rgba32abf.png

@@ -0,0 +1,3 @@
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+size 14547

tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_Os2BitmapArray_Rgba32_9S.png

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+size 884

tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_Os2BitmapArray_Rgba32_DIAMOND.png

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+size 648

tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_Os2BitmapArray_Rgba32_GMARBLE.png

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+size 20567

tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_Os2BitmapArray_Rgba32_PINES.png

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+size 21406

tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_Os2BitmapArray_Rgba32_SKATER.png

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+size 636

tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_Os2BitmapArray_Rgba32_SPADE.png

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tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_Os2BitmapArray_Rgba32_SUNFLOW.png

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+size 14190

tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_Os2BitmapArray_Rgba32_WARPD.png

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+size 103892

tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_Os2BitmapArray_Rgba32_ba-bm.png

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+size 5081

tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_Os2v2Header_Rgba32_pal8os2v2.png

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tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_Os2v2XShortHeader_Rgba32_pal8os2v2-16.png

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tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_RunLengthEncoded_24Bit_Rgba32_rgb24rle24.png

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tests/Images/External/ReferenceOutput/BmpDecoderTests/BmpDecoder_CanDecode_RunLengthEncoded_24Bit_Rgba32_rle24rlecut.png

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