Add test case for uint pixel type with alpha

src/ImageSharp/Formats/Exr/ExrDecoderCore.cs

@@ -223,7 +223,7 @@ internal sealed class ExrDecoderCore : ImageDecoderCore
 
                 for (int x = 0; x < width; x++)
                 {
-                    Rgb96 pixelValue = new(redPixelData[x], greenPixelData[x], bluePixelData[x]);
+                    Rgba128 pixelValue = new(redPixelData[x], greenPixelData[x], bluePixelData[x], hasAlpha ? alphaPixelData[x] : uint.MaxValue);
                     pixelRow[x] = TPixel.FromVector4(pixelValue.ToVector4());
                 }
 

tests/ImageSharp.Tests/Formats/Exr/ExrDecoderTests.cs

@@ -55,6 +55,20 @@ public class ExrDecoderTests
         Assert.Equal(ExrPixelType.UnsignedInt, exrMetaData.PixelType);
     }
 
+    [Theory]
+    [WithFile(TestImages.Exr.UintRgba, PixelTypes.Rgba32)]
+    public void ExrDecoder_CanDecode_Uncompressed_Rgba_ExrPixelType_Uint<TPixel>(TestImageProvider<TPixel> provider)
+        where TPixel : unmanaged, IPixel<TPixel>
+    {
+        using Image<TPixel> image = provider.GetImage(ExrDecoder.Instance);
+        ExrMetadata exrMetaData = image.Metadata.GetExrMetadata();
+        image.DebugSave(provider);
+
+        // Compare to referene output, since the reference decoder does not support this pixel type.
+        image.CompareToReferenceOutput(provider);
+        Assert.Equal(ExrPixelType.UnsignedInt, exrMetaData.PixelType);
+    }
+
     [Theory]
     [WithFile(TestImages.Exr.Rgb, PixelTypes.Rgba32)]
     public void ExrDecoder_CanDecode_Rgb<TPixel>(TestImageProvider<TPixel> provider)

tests/ImageSharp.Tests/TestImages.cs

@@ -1389,6 +1389,7 @@ public static class TestImages
         public const string UncompressedRgba = "Exr/Calliphora_uncompressed_rgba.exr";
         public const string UncompressedFloatRgb = "Exr/rgb_float32_uncompressed.exr";
         public const string UncompressedUintRgb = "Exr/Calliphora_uint32_uncompressed.exr";
+        public const string UintRgba = "Exr/rgba_uint_zip_compressed.exr";
         public const string Zip = "Exr/Calliphora_zip.exr";
         public const string Zips = "Exr/Calliphora_zips.exr";
         public const string Rle = "Exr/Calliphora_rle.exr";

tests/Images/External/ReferenceOutput/ExrDecoderTests/ExrDecoder_CanDecode_Uncompressed_Rgba_ExrPixelType_Uint_Rgba32_rgba_uint_zip_compressed.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:843bea4db378f52935e2f19f60d289df8ebe20ddde3977c63225f1d58a10bd62
+size 48119

tests/Images/Input/Exr/rgba_uint_zip_compressed.exr

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ff2ff1cdcfd219415430ba30a18962b54860d88bfc3adf337e97574c33c5e214
+size 119614