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SpectralToPixelConversionTests.cs
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SpectralToPixelConversionTests.cs
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// 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, cancellationToken: default);
// Test metadata
provider.Utility.TestGroupName = nameof(JpegDecoderTests);
provider.Utility.TestName = JpegDecoderTests.DecodeBaselineJpegOutputName;
// Comparison
using (Image<TPixel> image = new Image<TPixel>(Configuration.Default, converter.GetPixelBuffer(), 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);
}
}
}
}