Add CropWebProcessor

src/Umbraco.Web.Common/ImageProcessors/CropWebProcessor.cs

@@ -0,0 +1,78 @@
+using System.Collections.Generic;
+using System.Globalization;
+using Microsoft.Extensions.Logging;
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Processing;
+using SixLabors.ImageSharp.Web;
+using SixLabors.ImageSharp.Web.Commands;
+using SixLabors.ImageSharp.Web.Processors;
+using ImageCropperCropCoordinates = Umbraco.Cms.Core.PropertyEditors.ValueConverters.ImageCropperValue.ImageCropperCropCoordinates;
+
+namespace Umbraco.Cms.Web.Common.ImageProcessors
+{
+    public class CropWebProcessor : IImageWebProcessor
+    {
+        /// <summary>
+        /// The command constant for the crop definition
+        /// </summary>
+        public const string Crop = "crop";
+
+        public FormattedImage Process(
+            FormattedImage image,
+            ILogger logger,
+            IDictionary<string, string> commands,
+            CommandParser parser,
+            CultureInfo culture)
+        {
+            ImageCropperCropCoordinates cropCoordinates = GetCropCoordinates(commands);
+            if (cropCoordinates is null)
+            {
+                return image;
+            }
+
+            Size size = image.Image.Size();
+            Rectangle crop = GetCropRectangle(size.Width, size.Height, cropCoordinates);
+            image.Image.Mutate(x => x.Crop(crop));
+            return image;
+        }
+
+        private static readonly IEnumerable<string> CropCommands = new[] {Crop};
+
+        public IEnumerable<string> Commands { get; } = CropCommands;
+
+        private static Rectangle GetCropRectangle(int width, int height, ImageCropperCropCoordinates coordinates)
+        {
+
+            // Get coordinates of top left corner of the rectangle
+            var topX = decimal.ToInt32(width * coordinates.X1);
+            var topY = decimal.ToInt32(height * coordinates.Y1);
+            // Get coordinated of bottom right corner
+            var bottomX = decimal.ToInt32(width - (width * coordinates.X2));
+            var bottomY = decimal.ToInt32(height - (height * coordinates.Y2));
+
+            // Get width and height of crop
+            var cropWidth = bottomX - topX;
+            var cropHeight = bottomY - topY;
+
+            return new Rectangle(topX, topY, cropWidth, cropHeight);
+        }
+
+        private static ImageCropperCropCoordinates GetCropCoordinates(IDictionary<string, string> commands)
+        {
+            if (!commands.TryGetValue(Crop, out var crop))
+            {
+                return null;
+            }
+
+            var crops = crop.Split(',');
+
+            return new ImageCropperCropCoordinates()
+            {
+                X1 = decimal.Parse(crops[0], CultureInfo.InvariantCulture),
+                Y1 = decimal.Parse(crops[1], CultureInfo.InvariantCulture),
+                X2 = decimal.Parse(crops[2], CultureInfo.InvariantCulture),
+                Y2 = decimal.Parse(crops[3], CultureInfo.InvariantCulture)
+            };
+        }
+    }
+}