added a bitmap scaling function

mRemoteV1/UI/DisplayProperties.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Drawing;
+using System.Drawing.Drawing2D;
+using System.Drawing.Imaging;
 using System.Windows.Forms;
 
 namespace mRemoteNG.UI
@@ -15,9 +17,62 @@ namespace mRemoteNG.UI
         /// Scale the given nominal width value by the <see cref="ResolutionScalingFactor"/>
         /// </summary>
         /// <param name="width"></param>
-        public int CalculateScaledWidth(int width)
+        public int ScaleWidth(int width)
         {
-            return (int) Math.Round(width * ResolutionScalingFactor.Width);
+            return CalculateScaledValue(width, ResolutionScalingFactor.Width);
+        }
+
+        /// <summary>
+        /// Scale the given nominal height value by the <see cref="ResolutionScalingFactor"/>
+        /// </summary>
+        /// <param name="height"></param>
+        public int ScaleHeight(int height)
+        {
+            return CalculateScaledValue(height, ResolutionScalingFactor.Width);
+        }
+
+        /// <summary>
+        /// Scales the given image by <see cref="ResolutionScalingFactor"/>
+        /// </summary>
+        /// <param name="image">The image to resize.</param>
+        /// <returns>The resized image.</returns>
+        /// <remarks>
+        /// Code from https://stackoverflow.com/questions/1922040/how-to-resize-an-image-c-sharp
+        /// </remarks>
+        public Bitmap ScaleImage(Image image)
+        {
+            var width = ScaleWidth(image.Width);
+            var height = ScaleHeight(image.Height);
+            var destRect = new Rectangle(0, 0, width, height);
+            var destImage = new Bitmap(width, height);
+
+            destImage.SetResolution(image.HorizontalResolution, image.VerticalResolution);
+
+            using (var graphics = Graphics.FromImage(destImage))
+            {
+                graphics.CompositingMode = CompositingMode.SourceCopy;
+                graphics.CompositingQuality = CompositingQuality.HighQuality;
+                graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
+                graphics.SmoothingMode = SmoothingMode.HighQuality;
+                graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
+
+                using (var wrapMode = new ImageAttributes())
+                {
+                    wrapMode.SetWrapMode(WrapMode.TileFlipXY);
+                    graphics.DrawImage(image, destRect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, wrapMode);
+                }
+            }
+
+            return destImage;
+        }
+
+        /// <summary>
+        /// Scale the given nominal height value by the <see cref="ResolutionScalingFactor"/>
+        /// </summary>
+        /// <param name="width"></param>
+        private int CalculateScaledValue(int value, float scalingValue)
+        {
+            return (int)Math.Round(value * scalingValue);
         }
 
         private static SizeF GetResolutionScalingFactor()