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Use tolerant comparer for color palette tests
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@brianpopow
brianpopow committed Feb 14, 2021
1 parent 1d0406c commit 650e50f
Showing 1 changed file with 12 additions and 53 deletions.
65 changes: 12 additions & 53 deletions tests/ImageSharp.Tests/Formats/Tiff/TiffEncoderTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -153,79 +153,38 @@ public void TiffEncoder_EncodeGray_WithPackBitsCompression_Works<TPixel>(TestIma
[Theory]
[WithFile(Calliphora_PaletteUncompressed, PixelTypes.Rgba32)]
public void TiffEncoder_EncodeColorPalette_Works<TPixel>(TestImageProvider<TPixel> provider)
where TPixel : unmanaged, IPixel<TPixel>
{
var encoder = new TiffEncoder { Mode = TiffEncodingMode.ColorPalette, Compression = TiffEncoderCompression.None };

this.TiffEncoderPaletteTest(provider, encoder);
}
where TPixel : unmanaged, IPixel<TPixel> =>
TestTiffEncoderCore(provider, TiffBitsPerPixel.Pixel24, TiffEncodingMode.ColorPalette, useExactComparer: false, compareTolerance: 0.001f);

[Theory]
[WithFile(Calliphora_PaletteUncompressed, PixelTypes.Rgba32)]
public void TiffEncoder_EncodeColorPalette_WithDeflateCompression_Works<TPixel>(TestImageProvider<TPixel> provider)
where TPixel : unmanaged, IPixel<TPixel>
{
var encoder = new TiffEncoder { Mode = TiffEncodingMode.ColorPalette, Compression = TiffEncoderCompression.Deflate };

this.TiffEncoderPaletteTest(provider, encoder);
}
where TPixel : unmanaged, IPixel<TPixel> =>
TestTiffEncoderCore(provider, TiffBitsPerPixel.Pixel24, TiffEncodingMode.ColorPalette, TiffEncoderCompression.Deflate, useExactComparer: false, compareTolerance: 0.001f);

[Theory]
[WithFile(Calliphora_PaletteUncompressed, PixelTypes.Rgba32)]
public void TiffEncoder_EncodeColorPalette_WithDeflateCompressionAndPredictor_Works<TPixel>(TestImageProvider<TPixel> provider)
where TPixel : unmanaged, IPixel<TPixel>
{
var encoder = new TiffEncoder { Mode = TiffEncodingMode.ColorPalette, Compression = TiffEncoderCompression.Deflate, UseHorizontalPredictor = true };

this.TiffEncoderPaletteTest(provider, encoder);
}
where TPixel : unmanaged, IPixel<TPixel> =>
TestTiffEncoderCore(provider, TiffBitsPerPixel.Pixel24, TiffEncodingMode.ColorPalette, TiffEncoderCompression.Deflate, usePredictor: true, useExactComparer: false, compareTolerance: 0.001f);

[Theory]
[WithFile(Calliphora_PaletteUncompressed, PixelTypes.Rgba32)]
public void TiffEncoder_EncodeColorPalette_WithLzwCompression_Works<TPixel>(TestImageProvider<TPixel> provider)
where TPixel : unmanaged, IPixel<TPixel>
{
var encoder = new TiffEncoder { Mode = TiffEncodingMode.ColorPalette, Compression = TiffEncoderCompression.Lzw };

this.TiffEncoderPaletteTest(provider, encoder);
}
where TPixel : unmanaged, IPixel<TPixel> =>
TestTiffEncoderCore(provider, TiffBitsPerPixel.Pixel24, TiffEncodingMode.ColorPalette, TiffEncoderCompression.Lzw, useExactComparer: false, compareTolerance: 0.001f);

[Theory]
[WithFile(Calliphora_PaletteUncompressed, PixelTypes.Rgba32)]
public void TiffEncoder_EncodeColorPalette_WithLzwCompressionAndPredictor_Works<TPixel>(TestImageProvider<TPixel> provider)
where TPixel : unmanaged, IPixel<TPixel>
{
var encoder = new TiffEncoder { Mode = TiffEncodingMode.ColorPalette, Compression = TiffEncoderCompression.Lzw, UseHorizontalPredictor = true };

this.TiffEncoderPaletteTest(provider, encoder);
}
where TPixel : unmanaged, IPixel<TPixel> =>
TestTiffEncoderCore(provider, TiffBitsPerPixel.Pixel24, TiffEncodingMode.ColorPalette, TiffEncoderCompression.Lzw, usePredictor: true, useExactComparer: false, compareTolerance: 0.001f);

[Theory]
[WithFile(Calliphora_PaletteUncompressed, PixelTypes.Rgba32)]
public void TiffEncoder_EncodeColorPalette_WithPackBitsCompression_Works<TPixel>(TestImageProvider<TPixel> provider)
where TPixel : unmanaged, IPixel<TPixel>
{
var encoder = new TiffEncoder { Mode = TiffEncodingMode.ColorPalette, Compression = TiffEncoderCompression.PackBits };

this.TiffEncoderPaletteTest(provider, encoder);
}

private void TiffEncoderPaletteTest<TPixel>(TestImageProvider<TPixel> provider, TiffEncoder encoder)
where TPixel : unmanaged, IPixel<TPixel>
{
// Because a quantizer is used to create the palette (and therefore changes to the original are expected),
// we do not compare the encoded image against the original:
// Instead we load the encoded image with a reference decoder and compare against that image.
using Image<TPixel> image = provider.GetImage();
using var memStream = new MemoryStream();

image.Save(memStream, encoder);
memStream.Position = 0;

using var encodedImage = (Image<TPixel>)Image.Load(this.configuration, memStream);
var encodedImagePath = provider.Utility.SaveTestOutputFile(encodedImage, "tiff", encoder);
TiffTestUtils.CompareWithReferenceDecoder(encodedImagePath, encodedImage);
}
where TPixel : unmanaged, IPixel<TPixel> =>
TestTiffEncoderCore(provider, TiffBitsPerPixel.Pixel24, TiffEncodingMode.ColorPalette, TiffEncoderCompression.PackBits, useExactComparer: false, compareTolerance: 0.001f);

[Theory]
[WithFile(Calliphora_BiColorUncompressed, PixelTypes.Rgba32)]
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