Add test for tiff with webp compressed data

src/ImageSharp/Formats/Tiff/README.md

@@ -37,11 +37,12 @@
 |PackBits                   |   Y   |   Y   |                          |
 |CcittGroup3Fax             |   Y   |   Y   |                          |
 |CcittGroup4Fax             |   Y   |   Y   |                          |
-|Lzw                        |   Y   |   Y   | Based on ImageSharp GIF LZW implementation - this code could be modified to be (i) shared, or (ii) optimised for each case |
+|Lzw                        |   Y   |   Y   | Based on ImageSharp GIF LZW implementation - this code could be modified to be (i) shared, or (ii) optimised for each case. |
-|Old Jpeg                   |       |       | We should not even try to support this |
+|Old Jpeg                   |       |       | We should not even try to support this. |
 |Jpeg (Technote 2)          |   Y   |   Y   |                          |
 |Deflate (Technote 2)       |   Y   |   Y   | Based on PNG Deflate.    |
 |Old Deflate (Technote 2)   |       |   Y   |                          |
+|Webp   					|       |   Y   |                          |
 
 ### Photometric Interpretation Formats
 

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

@@ -651,6 +651,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
         public void TiffDecoder_CanDecode_JpegCompressed<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)
+            where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider, useExactComparer: false);
+
         // https://github.com/SixLabors/ImageSharp/issues/1891
         [Theory]
         [WithFile(Issues1891, PixelTypes.Rgba32)]

tests/ImageSharp.Tests/TestImages.cs

@@ -760,7 +760,7 @@ namespace SixLabors.ImageSharp.Tests
             public const string Calliphora_BiColorUncompressed = "Tiff/Calliphora_bicolor_uncompressed.tiff";
             public const string Fax4Compressed = "Tiff/basi3p02_fax4.tiff";
             public const string Fax4CompressedLowerOrderBitsFirst = "Tiff/basi3p02_fax4_lowerOrderBitsFirst.tiff";
-
+            public const string WebpCompressed = "Tiff/webp_compressed.tiff";
             public const string CcittFax3AllTermCodes = "Tiff/ccitt_fax3_all_terminating_codes.tiff";
             public const string CcittFax3AllMakeupCodes = "Tiff/ccitt_fax3_all_makeup_codes.tiff";
             public const string HuffmanRleAllTermCodes = "Tiff/huffman_rle_all_terminating_codes.tiff";

tests/Images/Input/Tiff/webp_compressed.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:72fd7fa941aa6201faa5368349764b4c17b582bee9be65861bad6308a8c5e4fe
+size 4898