Moved method from TileImageLoader to TileSource

MapControl/Shared/TileImageLoader.cs

@@ -119,9 +119,7 @@ namespace MapControl
             }
         }
 
-        protected virtual Task<ImageSource> LoadImageAsync(byte[] buffer) => ImageLoader.LoadImageAsync(buffer);
+        private static async Task LoadTileAsync(Tile tile, TileSource tileSource, string cacheName)
-
-        private async Task LoadTileAsync(Tile tile, TileSource tileSource, string cacheName)
         {
             Func<Task<ImageSource>> loadImageFunc;
 
@@ -139,7 +137,7 @@ namespace MapControl
 
                 if (buffer == null || buffer.Length == 0) return;
 
-                loadImageFunc = () => LoadImageAsync(buffer);
+                loadImageFunc = () => tileSource.LoadImageAsync(buffer);
             }
 
             await LoadTileAsync(tile, loadImageFunc).ConfigureAwait(false); // loadImageFunc runs in UI thread in WinUI/UWP

MapControl/Shared/TileSource.cs

@@ -75,7 +75,7 @@ namespace MapControl
 
         /// <summary>
         /// Loads a tile ImageSource asynchronously from GetUri(column, row, zoomLevel).
-        /// This method is called by TileImageLoader for TileSources without caching.
+        /// This method is called by TileImageLoader when caching is disabled.
         /// </summary>
         public virtual Task<ImageSource> LoadImageAsync(int column, int row, int zoomLevel)
         {
@@ -84,6 +84,12 @@ namespace MapControl
             return uri != null ? ImageLoader.LoadImageAsync(uri) : Task.FromResult((ImageSource)null);
         }
 
+        /// <summary>
+        /// Loads a tile ImageSource asynchronously from an encoded frame buffer in a byte array.
+        /// This method is called by TileImageLoader when caching is enabled.
+        /// </summary>
+        public virtual Task<ImageSource> LoadImageAsync(byte[] buffer) => ImageLoader.LoadImageAsync(buffer);
+
         /// <summary>
         /// Creates a TileSource instance from an Uri template string.
         /// </summary>