Add test for old jpeg compression

tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs

@@ -664,6 +664,11 @@ public class TiffDecoderTests : TiffDecoderBaseTester
     public void TiffDecoder_CanDecode_JpegCompressed<TPixel>(TestImageProvider<TPixel> provider)
         where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider, useExactComparer: false);
 
+    [Theory]
+    [WithFile(RgbOldJpegCompressed, PixelTypes.Rgba32)]
+    public void TiffDecoder_CanDecode_OldJpegCompressed<TPixel>(TestImageProvider<TPixel> provider)
+        where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider, useExactComparer: false);
+
     [Theory]
     [WithFile(WebpCompressed, PixelTypes.Rgba32)]
     public void TiffDecoder_CanDecode_WebpCompressed<TPixel>(TestImageProvider<TPixel> provider)

tests/ImageSharp.Tests/TestImages.cs

@@ -795,6 +795,7 @@ public static class TestImages
         public const string RgbDeflateMultistrip = "Tiff/rgb_deflate_multistrip.tiff";
         public const string RgbJpegCompressed = "Tiff/rgb_jpegcompression.tiff";
         public const string RgbJpegCompressed2 = "Tiff/twain-rgb-jpeg-with-bogus-ycbcr-subsampling.tiff";
+        public const string RgbOldJpegCompressed = "Tiff/OldJpegCompression.tiff";
         public const string RgbWithStripsJpegCompressed = "Tiff/rgb_jpegcompressed_stripped.tiff";
         public const string RgbJpegCompressedNoJpegTable = "Tiff/rgb_jpegcompressed_nojpegtable.tiff";
         public const string RgbLzwPredictor = "Tiff/rgb_lzw_predictor.tiff";

tests/Images/Input/Tiff/OldJpegCompression.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0a5a02fb888a47ed51aa6d72122f9d1996311e943be62bef4829bc1aa9f457e8
+size 214023