From a8dd90d9d61538edb5069491afeaa7662f338407 Mon Sep 17 00:00:00 2001
From: Mole <nikolajlauridsen@protonmail.ch>
Date: Thu, 8 Jul 2021 13:48:44 +0200
Subject: [PATCH] Add CropWebProcessor

---
 .../UmbracoBuilder.ImageSharp.cs              |  3 +
 .../ImageProcessors/CropWebProcessor.cs       | 78 +++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 src/Umbraco.Web.Common/ImageProcessors/CropWebProcessor.cs

diff --git a/src/Umbraco.Web.Common/DependencyInjection/UmbracoBuilder.ImageSharp.cs b/src/Umbraco.Web.Common/DependencyInjection/UmbracoBuilder.ImageSharp.cs
index 96bf7017cb..775d36eaf5 100644
--- a/src/Umbraco.Web.Common/DependencyInjection/UmbracoBuilder.ImageSharp.cs
+++ b/src/Umbraco.Web.Common/DependencyInjection/UmbracoBuilder.ImageSharp.cs
@@ -10,6 +10,7 @@ using SixLabors.ImageSharp.Web.Processors;
 using SixLabors.ImageSharp.Web.Providers;
 using Umbraco.Cms.Core.Configuration.Models;
 using Umbraco.Cms.Core.DependencyInjection;
+using Umbraco.Cms.Web.Common.ImageProcessors;
 
 namespace Umbraco.Extensions
 {
@@ -51,6 +52,8 @@ namespace Umbraco.Extensions
                 .SetCache<PhysicalFileSystemCache>()
                 .SetCacheHash<CacheHash>()
                 .AddProvider<PhysicalFileSystemProvider>()
+                .ClearProcessors()  // ImageSharp includes the processors by default, so we have to clear and re-add to control the order
+                .AddProcessor<CropWebProcessor>()
                 .AddProcessor<ResizeWebProcessor>()
                 .AddProcessor<FormatWebProcessor>()
                 .AddProcessor<BackgroundColorWebProcessor>();
diff --git a/src/Umbraco.Web.Common/ImageProcessors/CropWebProcessor.cs b/src/Umbraco.Web.Common/ImageProcessors/CropWebProcessor.cs
new file mode 100644
index 0000000000..6393e9455f
--- /dev/null
+++ b/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)
+            };
+        }
+    }
+}