Added compressed grayscale 16 bit decoder tests

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

@@ -35,7 +35,7 @@ public class TiffDecoderTests : TiffDecoderBaseTester
         using MemoryStream stream = new(testFile.Bytes, false);
         ImageInfo info = Image.Identify(stream);
 
-        Assert.Equal(expectedPixelSize, info.PixelType?.BitsPerPixel);
+        Assert.Equal(expectedPixelSize, info.PixelType.BitsPerPixel);
         Assert.Equal(expectedWidth, info.Width);
         Assert.Equal(expectedHeight, info.Height);
         Assert.NotNull(info.Metadata);
@@ -601,6 +601,8 @@ public class TiffDecoderTests : TiffDecoderBaseTester
     [WithFile(RgbDeflateMultistrip, PixelTypes.Rgba32)]
     [WithFile(Calliphora_GrayscaleDeflate, PixelTypes.Rgba32)]
     [WithFile(Calliphora_GrayscaleDeflate_Predictor, PixelTypes.Rgba32)]
+    [WithFile(Calliphora_GrayscaleDeflate16Bit, PixelTypes.Rgba32)]
+    [WithFile(Calliphora_GrayscaleDeflate_Predictor16Bit, PixelTypes.Rgba32)]
     [WithFile(Calliphora_RgbDeflate_Predictor, PixelTypes.Rgba32)]
     [WithFile(RgbDeflate, PixelTypes.Rgba32)]
     [WithFile(RgbDeflatePredictor, PixelTypes.Rgba32)]
@@ -617,6 +619,7 @@ public class TiffDecoderTests : TiffDecoderBaseTester
     [WithFile(Calliphora_RgbPaletteLzw_Predictor, PixelTypes.Rgba32)]
     [WithFile(Calliphora_RgbLzwPredictor, PixelTypes.Rgba32)]
     [WithFile(Calliphora_GrayscaleLzw_Predictor, PixelTypes.Rgba32)]
+    [WithFile(Calliphora_GrayscaleLzw_Predictor16Bit, PixelTypes.Rgba32)]
     [WithFile(SmallRgbLzw, PixelTypes.Rgba32)]
     public void TiffDecoder_CanDecode_LzwCompressed<TPixel>(TestImageProvider<TPixel> provider)
         where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider);

tests/ImageSharp.Tests/TestImages.cs

@@ -768,6 +768,9 @@ public static class TestImages
         public const string Calliphora_GrayscaleLzw_Predictor = "Tiff/Calliphora_gray_lzw_predictor.tiff";
         public const string Calliphora_GrayscaleDeflate = "Tiff/Calliphora_gray_deflate.tiff";
         public const string Calliphora_GrayscaleUncompressed16Bit = "Tiff/Calliphora_grayscale_uncompressed_16bit.tiff";
+        public const string Calliphora_GrayscaleDeflate_Predictor16Bit = "Tiff/Calliphora_gray_deflate_predictor_16bit.tiff";
+        public const string Calliphora_GrayscaleLzw_Predictor16Bit = "Tiff/Calliphora_gray_lzw_predictor_16bit.tiff";
+        public const string Calliphora_GrayscaleDeflate16Bit = "Tiff/Calliphora_gray_deflate_16bit.tiff";
         public const string Calliphora_RgbDeflate_Predictor = "Tiff/Calliphora_rgb_deflate_predictor.tiff";
         public const string Calliphora_RgbJpeg = "Tiff/Calliphora_rgb_jpeg.tiff";
         public const string Calliphora_PaletteUncompressed = "Tiff/Calliphora_palette_uncompressed.tiff";

tests/Images/Input/Tiff/Calliphora_gray_deflate_16bit.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4fdf62eb43c0349cb8c6ad67e5389a0f307944d8a8e760667a7f78fcc48a9ffa
+size 62698

tests/Images/Input/Tiff/Calliphora_gray_deflate_predictor_16bit.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8040010e7f760d09dda49145050b07f32826037c11686d976b4b7949a0c40c18
+size 54086

tests/Images/Input/Tiff/Calliphora_gray_lzw_predictor_16bit.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:67246d3bfc0c361fae21db04fa0251168c7e12abe3c3cc134cd1d685fb09876f
+size 58392