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QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Extensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Runtime.InteropServices;
+using System.Windows;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+
+namespace QuickLook.Plugin.PDFViewer
+{
+    public static class Extensions
+    {
+        public static void ForEach<T>(this IEnumerable<T> enumeration, Action<T> action)
+        {
+            foreach (var item in enumeration)
+                action(item);
+        }
+
+        public static T GetDescendantByType<T>(this Visual element) where T : class
+        {
+            if (element == null)
+                return default(T);
+            if (element.GetType() == typeof(T))
+                return element as T;
+
+            T foundElement = null;
+            (element as FrameworkElement)?.ApplyTemplate();
+
+            for (var i = 0; i < VisualTreeHelper.GetChildrenCount(element); i++)
+            {
+                var visual = VisualTreeHelper.GetChild(element, i) as Visual;
+                foundElement = visual.GetDescendantByType<T>();
+                if (foundElement != null)
+                    break;
+            }
+            return foundElement;
+        }
+
+        [DllImport("gdi32")]
+        private static extern int DeleteObject(IntPtr o);
+
+        public static BitmapSource ToBitmapSource(this Bitmap source)
+        {
+            var ip = source.GetHbitmap();
+            BitmapSource bs = null;
+            try
+            {
+                var data = source.LockBits(new Rectangle(0, 0, source.Width, source.Height),
+                    ImageLockMode.ReadOnly, source.PixelFormat);
+
+                bs = BitmapSource.Create(source.Width, source.Height, source.HorizontalResolution,
+                    source.VerticalResolution, PixelFormats.Bgr24, null,
+                    data.Scan0, data.Stride * source.Height, data.Stride);
+
+                source.UnlockBits(data);
+
+                bs.Freeze();
+            }
+            finally
+            {
+                DeleteObject(ip);
+            }
+
+            return bs;
+        }
+    }
+}