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103 lines
4.4 KiB
103 lines
4.4 KiB
// Copyright (c) Six Labors.
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// Licensed under the Six Labors Split License.
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using SixLabors.ImageSharp.Metadata.Profiles.Exif;
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using SixLabors.ImageSharp.PixelFormats;
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using SixLabors.ImageSharp.Processing;
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using SixLabors.ImageSharp.Tests.TestUtilities;
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// ReSharper disable InconsistentNaming
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namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms;
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[Trait("Category", "Processors")]
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[GroupOutput("Transforms")]
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public class FlipTests
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{
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public static readonly TheoryData<FlipMode> FlipValues =
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new()
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{
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FlipMode.None,
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FlipMode.Vertical,
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FlipMode.Horizontal
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};
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[Theory]
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[WithTestPatternImages(nameof(FlipValues), 20, 37, PixelTypes.Rgba32)]
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[WithTestPatternImages(nameof(FlipValues), 53, 37, PixelTypes.Rgba32)]
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[WithTestPatternImages(nameof(FlipValues), 17, 32, PixelTypes.Rgba32)]
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public void Flip<TPixel>(TestImageProvider<TPixel> provider, FlipMode flipMode)
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where TPixel : unmanaged, IPixel<TPixel>
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=> provider.RunValidatingProcessorTest(
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ctx => ctx.Flip(flipMode),
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testOutputDetails: flipMode,
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appendPixelTypeToFileName: false);
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[Theory]
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[WithTestPatternImages(nameof(FlipValues), 53, 37, PixelTypes.Rgba32)]
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[WithTestPatternImages(nameof(FlipValues), 17, 32, PixelTypes.Rgba32)]
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public void Flip_WorksOnWrappedMemoryImage<TPixel>(TestImageProvider<TPixel> provider, FlipMode flipMode)
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where TPixel : unmanaged, IPixel<TPixel>
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=> provider.RunValidatingProcessorTestOnWrappedMemoryImage(
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ctx => ctx.Flip(flipMode),
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testOutputDetails: flipMode,
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useReferenceOutputFrom: nameof(this.Flip),
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appendPixelTypeToFileName: false);
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[Theory]
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[WithTestPatternImages(100, 100, PixelTypes.Rgba32)]
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public void FlipVerticalUpdatesSubject<TPixel>(TestImageProvider<TPixel> provider)
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where TPixel : unmanaged, IPixel<TPixel>
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{
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using Image<TPixel> image = provider.GetImage();
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image.Metadata.ExifProfile = new ExifProfile();
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image.Metadata.ExifProfile.SetValue(ExifTag.SubjectLocation, [5, 15]);
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image.Metadata.ExifProfile.SetValue(ExifTag.SubjectArea, [5, 15, 50, 50]);
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image.Mutate(ctx => ctx.Flip(FlipMode.Vertical));
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// The subject location is a single coordinate, so a vertical flip simply reflects its Y position:
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// newY = imageHeight - originalY - 1
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// This mirrors the point vertically around the image's horizontal axis, preserving its X coordinate.
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Assert.Equal(
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[5, 84],
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image.Metadata.ExifProfile.GetValue(ExifTag.SubjectLocation).Value);
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// The subject area is now inverted because a vertical flip reflects the image across
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// the horizontal axis passing through the image center.
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// The Y-coordinate of the top edge is recalculated as:
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// newY = imageHeight - originalY - height - 1
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Assert.Equal(
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[5, 34, 50, 50],
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image.Metadata.ExifProfile.GetValue(ExifTag.SubjectArea).Value);
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}
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[Theory]
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[WithTestPatternImages(100, 100, PixelTypes.Rgba32)]
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public void FlipHorizontalUpdatesSubject<TPixel>(TestImageProvider<TPixel> provider)
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where TPixel : unmanaged, IPixel<TPixel>
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{
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using Image<TPixel> image = provider.GetImage();
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image.Metadata.ExifProfile = new ExifProfile();
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image.Metadata.ExifProfile.SetValue(ExifTag.SubjectLocation, [5, 15]);
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image.Metadata.ExifProfile.SetValue(ExifTag.SubjectArea, [5, 15, 50, 50]);
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image.Mutate(ctx => ctx.Flip(FlipMode.Horizontal));
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// The subject location is a single coordinate, so a horizontal flip simply reflects its X position:
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// newX = imageWidth - originalX - 1
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// This mirrors the point horizontally around the image's vertical axis, preserving its Y coordinate.
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Assert.Equal(
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[94, 15],
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image.Metadata.ExifProfile.GetValue(ExifTag.SubjectLocation).Value);
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// The subject area is now inverted because a horizontal flip reflects the image across
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// the vertical axis passing through the image center.
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// The X-coordinate of the left edge is recalculated as:
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// newX = imageWidth - originalX - width - 1
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Assert.Equal(
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[44, 15, 50, 50],
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image.Metadata.ExifProfile.GetValue(ExifTag.SubjectArea).Value);
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}
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}
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