Add test for Issue 2528

tests/ImageSharp.Tests/Formats/WebP/WebpDecoderTests.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
-using System.Runtime.InteropServices;
 using System.Runtime.Intrinsics.X86;
 using SixLabors.ImageSharp.Formats;
 using SixLabors.ImageSharp.Formats.Webp;
@@ -340,6 +339,24 @@ public class WebpDecoderTests
         Assert.Equal(1, image.Frames.Count);
     }
 
+    [Theory]
+    [WithFile(Lossy.AnimatedIssue2528, PixelTypes.Rgba32)]
+    public void Decode_AnimatedLossy_IgnoreBackgroundColor_Works<TPixel>(TestImageProvider<TPixel> provider)
+        where TPixel : unmanaged, IPixel<TPixel>
+    {
+        WebpDecoderOptions options = new()
+        {
+            BackgroundColorHandling = BackgroundColorHandling.Ignore,
+            GeneralOptions = new DecoderOptions()
+            {
+                MaxFrames = 1
+            }
+        };
+        using Image<TPixel> image = provider.GetImage(WebpDecoder.Instance, options);
+        image.DebugSave(provider);
+        image.CompareToOriginal(provider, ReferenceDecoder);
+    }
+
     [Theory]
     [WithFile(Lossless.LossLessCorruptImage1, PixelTypes.Rgba32)]
     [WithFile(Lossless.LossLessCorruptImage2, PixelTypes.Rgba32)]

tests/ImageSharp.Tests/TestImages.cs

@@ -677,6 +677,7 @@ public static class TestImages
             public const string WithXmp = "Webp/xmp_lossy.webp";
             public const string BikeSmall = "Webp/bike_lossy_small.webp";
             public const string Animated = "Webp/leo_animated_lossy.webp";
+            public const string AnimatedIssue2528 = "Webp/Issues/Issue2528.webp";
 
             // Lossy images without macroblock filtering.
             public const string BikeWithExif = "Webp/bike_lossy_with_exif.webp";

tests/Images/Input/Webp/issues/Issue2528.webp

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b4aa2ba2e6ef0263b5b657e4d15241d497721a0461250b1d942751812b96de71
+size 60214