ImageSharp.Drawing/tests/ImageSharp.Drawing.Tests/Drawing/ClipTests.cs at a7eaa1baa9ac984f5798f19f5b2aff25ba126d2b · SixLabors/ImageSharp.Drawing · GitHub

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// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

using System.Numerics;
using SixLabors.ImageSharp.Drawing.Processing;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;

namespace SixLabors.ImageSharp.Drawing.Tests.Drawing;

[GroupOutput("Drawing")]
public class ClipTests
{
    [Theory]
    [WithBasicTestPatternImages(250, 350, PixelTypes.Rgba32, 0, 0, 0.5)]
    [WithBasicTestPatternImages(250, 350, PixelTypes.Rgba32, -20, -20, 0.5)]
    [WithBasicTestPatternImages(250, 350, PixelTypes.Rgba32, -20, -100, 0.5)]
    [WithBasicTestPatternImages(250, 350, PixelTypes.Rgba32, 20, 20, 0.5)]
    [WithBasicTestPatternImages(250, 350, PixelTypes.Rgba32, 40, 60, 0.2)]
    public void Clip<TPixel>(TestImageProvider<TPixel> provider, float dx, float dy, float sizeMult)
        where TPixel : unmanaged, IPixel<TPixel>
    {
        FormattableString testDetails = $"offset_x{dx}_y{dy}";
        provider.RunValidatingProcessorTest(
            x =>
            {
                Size size = x.GetCurrentSize();
                int outerRadii = (int)(Math.Min(size.Width, size.Height) * sizeMult);
                Star star = new(new PointF(size.Width / 2, size.Height / 2), 5, outerRadii / 2, outerRadii);

                Matrix3x2 builder = Matrix3x2.CreateTranslation(new Vector2(dx, dy));
                x.Clip(star.Transform(builder), x => x.DetectEdges());
            },
            testOutputDetails: testDetails,
            appendPixelTypeToFileName: false,
            appendSourceFileOrDescription: false);
    }

    [Theory]
    [WithFile(TestImages.Png.Ducky, PixelTypes.Rgba32)]
    public void Clip_ConstrainsOperationToClipBounds<TPixel>(TestImageProvider<TPixel> provider)
        where TPixel : unmanaged, IPixel<TPixel>
        => provider.RunValidatingProcessorTest(
            x =>
            {
                Size size = x.GetCurrentSize();
                RectangleF rect = new(0, 0, size.Width / 2, size.Height / 2);
                RectangularPolygon clipRect = new(rect);
                x.Clip(clipRect, ctx => ctx.Flip(FlipMode.Vertical));
            },
            appendPixelTypeToFileName: false,
            appendSourceFileOrDescription: false);

    [Fact]
    public void Issue250_Vertical_Horizontal_Count_Should_Match()
    {
        PathCollection clip = new(new RectangularPolygon(new PointF(24, 16), new PointF(777, 385)));

        Path vert = new(new LinearLineSegment(new PointF(26, 384), new PointF(26, 163)));
        Path horiz = new(new LinearLineSegment(new PointF(26, 163), new PointF(176, 163)));

        IPath reverse = vert.Clip(clip);
        IEnumerable<ReadOnlyMemory<PointF>> result1 = vert.Clip(reverse).Flatten().Select(x => x.Points);

        reverse = horiz.Clip(clip);
        IEnumerable<ReadOnlyMemory<PointF>> result2 = horiz.Clip(reverse).Flatten().Select(x => x.Points);

        bool same = result1.Count() == result2.Count();
    }
}