5e9ce916cf
* Rename old imagesharp to v2 * Add Ronalds PR as imagesharp * Ensure that we use V3 by default
88 lines
3.4 KiB
C#
88 lines
3.4 KiB
C#
using System.Globalization;
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using System.Numerics;
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using Microsoft.Extensions.Logging;
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using SixLabors.ImageSharp;
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using SixLabors.ImageSharp.Metadata.Profiles.Exif;
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using SixLabors.ImageSharp.Processing;
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using SixLabors.ImageSharp.Web;
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using SixLabors.ImageSharp.Web.Commands;
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using SixLabors.ImageSharp.Web.Processors;
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namespace Umbraco.Cms.Imaging.ImageSharp.V2.ImageProcessors;
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/// <summary>
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/// Allows the cropping of images.
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/// </summary>
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/// <seealso cref="SixLabors.ImageSharp.Web.Processors.IImageWebProcessor" />
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public class CropWebProcessor : IImageWebProcessor
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{
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/// <summary>
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/// The command constant for the crop coordinates.
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/// </summary>
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public const string Coordinates = "cc";
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/// <summary>
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/// The command constant for the resize orientation handling mode.
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/// </summary>
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public const string Orient = "orient";
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/// <inheritdoc />
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public IEnumerable<string> Commands { get; } = new[] { Coordinates, Orient };
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/// <inheritdoc />
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public FormattedImage Process(FormattedImage image, ILogger logger, CommandCollection commands, CommandParser parser, CultureInfo culture)
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{
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Rectangle? cropRectangle = GetCropRectangle(image, commands, parser, culture);
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if (cropRectangle.HasValue)
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{
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image.Image.Mutate(x => x.Crop(cropRectangle.Value));
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}
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return image;
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}
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/// <inheritdoc />
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public bool RequiresTrueColorPixelFormat(CommandCollection commands, CommandParser parser, CultureInfo culture) =>
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false;
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private static Rectangle? GetCropRectangle(FormattedImage image, CommandCollection commands, CommandParser parser, CultureInfo culture)
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{
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var coordinates = parser.ParseValue<float[]>(commands.GetValueOrDefault(Coordinates), culture);
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if (coordinates.Length != 4 ||
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(coordinates[0] == 0 && coordinates[1] == 0 && coordinates[2] == 0 && coordinates[3] == 0))
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{
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return null;
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}
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// The right and bottom values are actually the distance from those sides, so convert them into real coordinates and transform to correct orientation
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var left = Math.Clamp(coordinates[0], 0, 1);
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var top = Math.Clamp(coordinates[1], 0, 1);
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var right = Math.Clamp(1 - coordinates[2], 0, 1);
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var bottom = Math.Clamp(1 - coordinates[3], 0, 1);
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var orientation = GetExifOrientation(image, commands, parser, culture);
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Vector2 xy1 = ExifOrientationUtilities.Transform(new Vector2(left, top), Vector2.Zero, Vector2.One, orientation);
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Vector2 xy2 = ExifOrientationUtilities.Transform(new Vector2(right, bottom), Vector2.Zero, Vector2.One, orientation);
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// Scale points to a pixel based rectangle
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Size size = image.Image.Size();
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return Rectangle.Round(RectangleF.FromLTRB(
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MathF.Min(xy1.X, xy2.X) * size.Width,
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MathF.Min(xy1.Y, xy2.Y) * size.Height,
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MathF.Max(xy1.X, xy2.X) * size.Width,
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MathF.Max(xy1.Y, xy2.Y) * size.Height));
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}
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private static ushort GetExifOrientation(FormattedImage image, CommandCollection commands, CommandParser parser, CultureInfo culture)
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{
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if (commands.Contains(Orient) && !parser.ParseValue<bool>(commands.GetValueOrDefault(Orient), culture))
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{
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return ExifOrientationMode.Unknown;
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}
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image.TryGetExifOrientation(out var orientation);
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return orientation;
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}
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}
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