Switch to high quality filtering when zooming out

PixiEditor/Helpers/Converters/ZoomLevelToBitmapScalingModeConverter.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Diagnostics;
+using System.Globalization;
+using System.Windows.Media;
+
+namespace PixiEditor.Helpers.Converters
+{
+    internal class ZoomLevelToBitmapScalingModeConverter : SingleInstanceConverter<ZoomLevelToBitmapScalingModeConverter>
+    {
+        public override object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            double zoomLevel = (double)value;
+            Debug.WriteLine(zoomLevel);
+            if (zoomLevel < 1)
+                return BitmapScalingMode.HighQuality;
+            return BitmapScalingMode.NearestNeighbor;
+        }
+
+        public override object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

PixiEditor/Views/UserControls/DrawingViewPort.xaml

@@ -82,11 +82,14 @@
                                           RenderOptions.BitmapScalingMode="NearestNeighbor"/>
 
                 <Image Source="{Binding PreviewLayerRenderer.FinalBitmap}" Panel.ZIndex="2"
-                       RenderOptions.BitmapScalingMode="NearestNeighbor" Stretch="Uniform"
+                       RenderOptions.BitmapScalingMode="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:Zoombox}}, Path=Zoom, Converter={converters:ZoomLevelToBitmapScalingModeConverter}}" 
+                       Stretch="Uniform"
                        Width="{Binding Width}" Height="{Binding Height}"/>
 
+
                 <Image VerticalAlignment="Top" HorizontalAlignment="Left" Source="{Binding Renderer.FinalBitmap}"
-                       RenderOptions.BitmapScalingMode="NearestNeighbor" Stretch="Uniform" 
+                       RenderOptions.BitmapScalingMode="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:Zoombox}}, Path=Zoom, Converter={converters:ZoomLevelToBitmapScalingModeConverter}}" 
+                       Stretch="Uniform" 
                        Visibility="{Binding XamlAccesibleViewModel.BitmapManager.OnlyReferenceLayer, Converter={InverseBoolToVisibilityConverter}}"/>
 
                 <local:PlainLayerView TargetLayer="{Binding ActiveSelection.SelectionLayer}"