Fixed baseline image invalid reference output png image

tests/ImageSharp.Tests/Formats/Jpg/SpectralToPixelConversionTests.cs

@@ -0,0 +1,69 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using System.IO;
+using System.Linq;
+using SixLabors.ImageSharp.Formats.Jpeg;
+using SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder;
+using SixLabors.ImageSharp.IO;
+using SixLabors.ImageSharp.Metadata;
+using SixLabors.ImageSharp.PixelFormats;
+using SixLabors.ImageSharp.Tests.TestUtilities.ImageComparison;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace SixLabors.ImageSharp.Tests.Formats.Jpg
+{
+    [Trait("Format", "Jpg")]
+    public class SpectralToPixelConversionTests
+    {
+        public static readonly string[] BaselineTestJpegs =
+            {
+                TestImages.Jpeg.Baseline.Calliphora, TestImages.Jpeg.Baseline.Cmyk, TestImages.Jpeg.Baseline.Jpeg400,
+                TestImages.Jpeg.Baseline.Jpeg444, TestImages.Jpeg.Baseline.Testorig420,
+                TestImages.Jpeg.Baseline.Jpeg420Small, TestImages.Jpeg.Baseline.Bad.BadEOF,
+                TestImages.Jpeg.Baseline.MultiScanBaselineCMYK
+            };
+
+        public SpectralToPixelConversionTests(ITestOutputHelper output)
+        {
+            this.Output = output;
+        }
+
+        private ITestOutputHelper Output { get; }
+
+        [Theory]
+        [WithFileCollection(nameof(BaselineTestJpegs), PixelTypes.Rgba32)]
+        public void Decoder_PixelBufferComparison<TPixel>(TestImageProvider<TPixel> provider)
+            where TPixel : unmanaged, IPixel<TPixel>
+        {
+            // Stream
+            byte[] sourceBytes = TestFile.Create(provider.SourceFileOrDescription).Bytes;
+            using var ms = new MemoryStream(sourceBytes);
+            using var bufferedStream = new BufferedReadStream(Configuration.Default, ms);
+
+            // Decoding
+            using var converter = new SpectralConverter<TPixel>(Configuration.Default, cancellationToken: default);
+            var decoder = new JpegDecoderCore(Configuration.Default, new JpegDecoder());
+            var scanDecoder = new HuffmanScanDecoder(bufferedStream, converter, cancellationToken: default);
+            decoder.ParseStream(bufferedStream, scanDecoder, ct: default);
+
+            // Test metadata
+            provider.Utility.TestGroupName = nameof(JpegDecoderTests);
+            provider.Utility.TestName = JpegDecoderTests.DecodeBaselineJpegOutputName;
+
+            // Comparison
+            using (Image<TPixel> image = new Image<TPixel>(Configuration.Default, converter.PixelBuffer, new ImageMetadata()))
+            using (Image<TPixel> referenceImage = provider.GetReferenceOutputImage<TPixel>(appendPixelTypeToFileName: false))
+            {
+                ImageSimilarityReport report = ImageComparer.Exact.CompareImagesOrFrames(referenceImage, image);
+
+                this.Output.WriteLine($"*** {provider.SourceFileOrDescription} ***");
+                this.Output.WriteLine($"Difference: {report.DifferencePercentageString}");
+
+                // ReSharper disable once PossibleInvalidOperationException
+                Assert.True(report.TotalNormalizedDifference.Value < 0.005f);
+            }
+        }
+    }
+}

tests/Images/External/ReferenceOutput/JpegDecoderTests/DecodeBaselineJpeg_jpeg420small.png

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:a76832570111a868ea6cb6e8287aae1976c575c94c63880c74346a4b5db5d305
+oid sha256:2b5e1d91fb6dc1ddb696fbee63331ba9c6ef3548b619c005887e60c5b01f4981
-size 27007
+size 27303