feat: Implement face encoder functionality with GPU support and recursive option

imagecatalog/AvaloniaMainWindow.axaml.cs

@@ -3,6 +3,7 @@ using Avalonia.Interactivity;
 using Avalonia.Platform.Storage;
 using Avalonia.Styling;
 using Avalonia.Threading;
+using System.ComponentModel;
 using System.IO;
 
 namespace ImageCatalog_2;
@@ -20,6 +21,7 @@ public partial class AvaloniaMainWindow : Window
         DataContext = _model;
 
         Opened += (_, _) => SyncThemeStateFromCurrentTheme();
+        Closing += AvaloniaMainWindow_Closing;
 
         // Let DataModel marshal callbacks onto Avalonia UI thread.
         _model.UiInvoker = action => Dispatcher.UIThread.Invoke(action);
@@ -135,6 +137,29 @@ public partial class AvaloniaMainWindow : Window
         };
     }
 
+    private bool _isStoppingFaceEncoderForClose;
+
+    private async void AvaloniaMainWindow_Closing(object? sender, CancelEventArgs e)
+    {
+        if (_isStoppingFaceEncoderForClose || !_model.IsFaceEncoderRunning)
+        {
+            return;
+        }
+
+        e.Cancel = true;
+        _isStoppingFaceEncoderForClose = true;
+
+        try
+        {
+            await _model.StopFaceEncoderAsync("Arresto face encoder in chiusura...", waitForExit: true);
+        }
+        finally
+        {
+            _isStoppingFaceEncoderForClose = false;
+            Close();
+        }
+    }
+
     private void ToggleTheme_Click(object? sender, RoutedEventArgs e)
     {
         _isDarkTheme = !_isDarkTheme;