ImageSharp/tests/ImageSharp.Tests/Image/ImageRotationTests.cs

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

using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;

namespace SixLabors.ImageSharp.Tests;

public class ImageRotationTests
{
    [Fact]
    public void RotateImageByMinus90Degrees()
    {
        (Size original, Size rotated) = Rotate(-90);
        Assert.Equal(new Size(original.Height, original.Width), rotated);
    }

    [Fact]
    public void RotateImageBy90Degrees()
    {
        (Size original, Size rotated) = Rotate(90);
        Assert.Equal(new Size(original.Height, original.Width), rotated);
    }

    [Fact]
    public void RotateImageBy180Degrees()
    {
        (Size original, Size rotated) = Rotate(180);
        Assert.Equal(original, rotated);
    }

    [Fact]
    public void RotateImageBy270Degrees()
    {
        (Size original, Size rotated) = Rotate(270);
        Assert.Equal(new Size(original.Height, original.Width), rotated);
    }

    [Fact]
    public void RotateImageBy360Degrees()
    {
        (Size original, Size rotated) = Rotate(360);
        Assert.Equal(original, rotated);
    }

    private static (Size Original, Size Rotated) Rotate(int angle)
    {
        TestFile file = TestFile.Create(TestImages.Bmp.Car);
        using Image<Rgba32> image = Image.Load<Rgba32>(file.FullPath);
        Size original = image.Size;
        image.Mutate(x => x.Rotate(angle));
        return (original, image.Size);
    }
}