new image processor which allows disabling the loop of an animated image

zero/Media/ImageSharp/Processors/LoopWebProcessor.cs

@@ -0,0 +1,64 @@
+using Microsoft.Extensions.Logging;
+using SixLabors.ImageSharp.Processing;
+using SixLabors.ImageSharp.Web;
+using SixLabors.ImageSharp.Web.Commands;
+using SixLabors.ImageSharp.Web.Processors;
+using System.Globalization;
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Formats.Gif;
+using SixLabors.ImageSharp.Formats.Png;
+using SixLabors.ImageSharp.Formats.Webp;
+
+namespace zero.Media.ImageSharp.Processors;
+
+public class LoopWebProcessor : IImageWebProcessor
+{
+  // <summary>
+  /// The command constant for the loop prop.
+  /// </summary>
+  public const string Loop = "loop";
+
+  /// <summary>
+  /// The reusable collection of commands.
+  /// </summary>
+  private static readonly IEnumerable<string> LoopCommands = [Loop];
+
+  /// <inheritdoc/>
+  public IEnumerable<string> Commands { get; } = LoopCommands;
+
+  /// <inheritdoc/>
+  public FormattedImage Process(
+      FormattedImage image,
+      ILogger logger,
+      CommandCollection commands,
+      CommandParser parser,
+      CultureInfo culture)
+  {
+    if (commands.Contains(Loop))
+    {
+      SixLabors.ImageSharp.Metadata.ImageMetadata metadata = image.Image.Metadata;
+      bool loop = parser.ParseValue<bool>(commands.GetValueOrDefault(Loop), culture);
+
+      if (!loop)
+      {
+        if (metadata.TryGetWebpMetadata(out WebpMetadata webpMetadata))
+        {
+          webpMetadata.RepeatCount = 1;
+        }
+        if (metadata.TryGetGifMetadata(out GifMetadata gifMetadata))
+        {
+          gifMetadata.RepeatCount = 1;
+        }
+        if (metadata.TryGetPngMetadata(out PngMetadata pngMetadata))
+        {
+          pngMetadata.RepeatCount = 1;
+        }
+      }
+    }
+
+    return image;
+  }
+
+  /// <inheritdoc/>
+  public bool RequiresTrueColorPixelFormat(CommandCollection commands, CommandParser parser, CultureInfo culture) => true;
+}

zero/Media/ImageSharp/Processors/StripMetadataWebProcessor.cs

@@ -16,8 +16,7 @@ public class StripMetadataWebProcessor : IImageWebProcessor
   /// <summary>
   /// The reusable collection of commands.
   /// </summary>
-  private static readonly IEnumerable<string> StripCommands
-      = new[] { Strip };
+  private static readonly IEnumerable<string> StripCommands = [Strip];
 
   /// <inheritdoc/>
   public IEnumerable<string> Commands { get; } = StripCommands;

zero/Media/ZeroMediaModule.cs

@@ -22,7 +22,8 @@ internal class ZeroMediaModule : ZeroModule
       .AddProvider<PhysicalFileProvider>()
       .AddProcessor<RotateWebProcessor>()
       .AddProcessor<StripMetadataWebProcessor>()
-      .AddProcessor<BlurWebProcessor>();
+      .AddProcessor<BlurWebProcessor>()
+      .AddProcessor<LoopWebProcessor>();
 
     services.AddOptions<PhysicalFileSystemCacheOptions>().Configure(opts =>
     {