1 files changed, 63 insertions, 0 deletions
diff --git a/win/CS/HandBrakeWPF/Helpers/GrayscaleImage.cs b/win/CS/HandBrakeWPF/Helpers/GrayscaleImage.cs
new file mode 100644
index 000000000..3993ddb40
--- /dev/null
+++ b/win/CS/HandBrakeWPF/Helpers/GrayscaleImage.cs
@@ -0,0 +1,63 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="GrayscaleImage.cs" company="HandBrake Project (http://handbrake.fr)">
+//   This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
+// </copyright>
+// <summary>
+//   Extend the Image Class to support a grayscale mode.
+//   Usage: local:AutoGreyableImage Source="Image.png"
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace HandBrakeWPF.Helpers
+{
+    using System;
+    using System.Windows;
+    using System.Windows.Controls;
+    using System.Windows.Media;
+    using System.Windows.Media.Imaging;
+
+    /// <summary>
+    /// Extend the Image Class to support a grayscale mode.
+    /// </summary>
+    public class GrayscaleImage : Image
+    {
+        /// <summary>
+        /// Initializes static members of the <see cref="GrayscaleImage"/> class. 
+        /// Usage: local:AutoGreyableImage Source="Image.png"
+        /// </summary>
+        static GrayscaleImage()
+        {
+            // Override the metadata of the IsEnabled property.
+            IsEnabledProperty.OverrideMetadata(typeof(GrayscaleImage), new FrameworkPropertyMetadata(true, IsEnabledPropertyChanged));
+        }
+
+        /// <summary>
+        /// The is enabled property changed.
+        /// When this changes, grayscale the image when false, leave with colour when true.
+        /// </summary>
+        /// <param name="source">
+        /// The source.
+        /// </param>
+        /// <param name="args">
+        /// The args.
+        /// </param>
+        private static void IsEnabledPropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs args)
+        {
+            var sourceImage = source as GrayscaleImage;
+            if (sourceImage != null)
+            {
+                if (!Convert.ToBoolean(args.NewValue))
+                {
+                    var bitmapImage = new BitmapImage(new Uri(sourceImage.Source.ToString()));
+                    sourceImage.Source = new FormatConvertedBitmap(bitmapImage, PixelFormats.Gray32Float, null, 0);
+                    sourceImage.OpacityMask = new ImageBrush(bitmapImage);
+                }
+                else
+                {
+                    sourceImage.Source = ((FormatConvertedBitmap)sourceImage.Source).Source;
+                    sourceImage.OpacityMask = null;
+                }
+            }
+        }
+    }
+}