Limit the size of full size images to the presentation area

Otherwise we can run out of memory ...

WordsLive/Images/ImagesPresentation.cs

@@ -51,7 +51,9 @@ public ImagesPresentation()
 			this.Control.Children.Add(frontGrid);
 
 			Loader.SetDisplayOption(back, DisplayOptions.FullResolution);
+			Loader.SetMaxSize(back, Math.Max(Area.Width, Area.Height));
 			Loader.AddLoadedHandler(back, back_Loaded);
+			this.Area.WindowSizeChanged	+= Area_WindowSizeChanged;
 
 			DoubleAnimation ani = new DoubleAnimation { From = 1.0, To = 0.0, FillBehavior = FillBehavior.Stop };
 			ani.Completed += ani_Completed;
@@ -62,6 +64,11 @@ public ImagesPresentation()
 			storyboard.Children.Add(ani);
 		}
 
+		private void Area_WindowSizeChanged(object sender, EventArgs e)
+		{
+			Loader.SetMaxSize(back, Math.Max(Area.Width, Area.Height));
+		}
+
 		void ani_Completed(object sender, EventArgs e)
 		{
 			front.Source = back.Source;
@@ -121,5 +128,11 @@ private void Update(ImageInfo image)
 			Loader.SetSourceType(back, image.SourceType);
 			Loader.SetSource(back, image.Source);
 		}
+
+		public override void Close()
+		{
+			this.Area.WindowSizeChanged -= Area_WindowSizeChanged;
+			base.Close();
+		}
 	}
 }

WordsLive/Utils/ImageLoader/Loader.cs

@@ -104,6 +104,20 @@ public static void SetDisplayOption(Image obj, DisplayOptions value)
 			DependencyProperty.RegisterAttached("DisplayOption", typeof(DisplayOptions), typeof(Loader), new UIPropertyMetadata(DisplayOptions.Preview));
 
 
+		[AttachedPropertyBrowsableForType(typeof(Image))]
+		public static int GetMaxSize(Image obj)
+		{
+			return (int)obj.GetValue(MaxSizeProperty);
+		}
+
+		public static void SetMaxSize(Image obj, int value)
+		{
+			obj.SetValue(MaxSizeProperty, value);
+		}
+		public static readonly DependencyProperty MaxSizeProperty =
+			DependencyProperty.RegisterAttached("MaxSize", typeof(int), typeof(Loader), new UIPropertyMetadata(0));
+
+
 
 		[AttachedPropertyBrowsableForType(typeof(Image))]
 		public static bool GetIsLoading(Image obj)

WordsLive/Utils/ImageLoader/Manager.cs

@@ -264,10 +264,12 @@ private ImageSource GetBitmapSource(LoadImageRequest loadTask, DisplayOptions lo
 				Stream imageStream = null;
 
 				SourceType sourceType = SourceType.LocalDisk;
+				int maxSize = 0;
 
 				image.Dispatcher.Invoke(new ThreadStart(delegate
 				{
 					sourceType = Loader.GetSourceType(image);
+					maxSize = Loader.GetMaxSize(image);
 				}));
 
 				try
@@ -366,12 +368,25 @@ private ImageSource GetBitmapSource(LoadImageRequest loadTask, DisplayOptions lo
 						{
 							BitmapFrame bitmapFrame = BitmapFrame.Create(imageStream);
 							int rotation = GetRotation(bitmapFrame.Metadata as BitmapMetadata);
+							bool isOrientationChanged = rotation != 0 && rotation != 180;
+
+							double usedFactor = 1.0;
+
+							if (maxSize != 0)
+							{
+								var origHeight = isOrientationChanged ? bitmapFrame.PixelWidth : bitmapFrame.PixelHeight;
+								var origWidth = isOrientationChanged ? bitmapFrame.PixelHeight : bitmapFrame.PixelWidth;
+								var heightFactor = maxSize / (double)origHeight;
+								var widthFactor = maxSize / (double)origWidth;
+								usedFactor = Math.Max(heightFactor, widthFactor);
+							}
 
 							TransformedBitmap bitmapImage = new TransformedBitmap();
 							bitmapImage.BeginInit();
 							bitmapImage.Source = bitmapFrame as BitmapSource;
 							TransformGroup transformGroup = new TransformGroup();
 							transformGroup.Children.Add(new RotateTransform(rotation));
+							transformGroup.Children.Add(new ScaleTransform(usedFactor, usedFactor));
 							bitmapImage.Transform = transformGroup;
 							bitmapImage.EndInit();
 
@@ -422,6 +437,12 @@ private ImageSource GetBitmapSource(LoadImageRequest loadTask, DisplayOptions lo
 							player.Close();
 						}
 					}
+					catch (System.OutOfMemoryException)
+					{
+						// for big images we sometimes run out of memory,
+						// but a manual GC seems to help ...
+						GC.Collect();
+					}
 					catch (Exception) { }
 				}