initial version

App.config

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+<?xml version="1.0"?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1"/>
+    </startup>
+</configuration>

App.xaml

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+<Application x:Class="WpfRenderPerformance.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>

App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace WpfRenderPerformance
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    /// 
+    public partial class App : Application
+    {
+        public OverlayWindow ow_;
+    }
+}

MainWindow.xaml

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+<Window x:Class="WpfRenderPerformance.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="WPF Render Performance Control Panel" Height="147.649" Width="525" Loaded="OnLoaded" Closed="Window_Closed" Topmost="True">
+    <Grid>
+        <CheckBox Name="TransparentChk" Content="Transparent" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" IsChecked="True" Click="CheckBox_Checked" Checked="CheckBox_Checked"/>
+        <Slider Name="WindowSizeSlider" HorizontalAlignment="Left" Margin="105,80,0,0" VerticalAlignment="Top" Width="391" ValueChanged="WindowSizeSlider_ValueChanged" Value="10.0"/>
+        <Label Content="Window Size" HorizontalAlignment="Left" Margin="10,76,0,0" VerticalAlignment="Top" Width="78"/>
+        <CheckBox Name="RenderChk" Content="Update overlay (30fps)" HorizontalAlignment="Left" Margin="10,29,0,0" VerticalAlignment="Top" IsChecked="True"/>
+        <CheckBox Name="SoftwareRenderChk" Content="Force Software Render" HorizontalAlignment="Left" Margin="10,49,0,0" VerticalAlignment="Top" Checked="SoftwareRenderChk_Checked" Unchecked="SoftwareRenderChk_Checked"/>
+    </Grid>
+</Window>

MainWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Interop;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace WpfRenderPerformance
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+
+        private void OnLoaded(object sender, RoutedEventArgs e)
+        {
+            App app = App.Current as App;
+
+            if (app.ow_ == null) {
+                app.ow_ = new OverlayWindow();
+                app.ow_.Width = (app.MainWindow as MainWindow).WindowSizeSlider.Value / 10.0 * System.Windows.SystemParameters.PrimaryScreenWidth;
+                app.ow_.Height = app.ow_.Width * 480.0 / 640.0;
+                app.ow_.Show();
+            }
+        }
+
+        private void CheckBox_Checked(object sender, RoutedEventArgs e)
+        {
+            App app = App.Current as App;
+
+            if (app.ow_ == null) return;
+
+            app.ow_.Close();
+
+            app.ow_ = new OverlayWindow();
+            app.ow_.Width = (app.MainWindow as MainWindow).WindowSizeSlider.Value / 10.0 * System.Windows.SystemParameters.PrimaryScreenWidth;
+            app.ow_.Height = app.ow_.Width * 480.0 / 640.0;
+
+            if (TransparentChk.IsChecked.GetValueOrDefault(false)) {
+                app.ow_.AllowsTransparency = true;
+            }
+            else {
+                app.ow_.AllowsTransparency = false;
+            }
+
+            app.ow_.Show();
+        }
+
+        private void Window_Closed(object sender, EventArgs e)
+        {
+            App app = App.Current as App;
+            app.ow_.Close();
+        }
+
+        private void WindowSizeSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
+        {
+            App app = App.Current as App;
+            if (app.ow_ != null)
+            {
+                app.ow_.Width = e.NewValue / 10.0 * System.Windows.SystemParameters.PrimaryScreenWidth;
+                app.ow_.Height = app.ow_.Width * 480.0 / 640.0;
+            }
+        }
+
+        private void SoftwareRenderChk_Checked(object sender, RoutedEventArgs e)
+        {
+            App app = App.Current as App;
+            HwndSource hwndSource = PresentationSource.FromVisual(app.ow_) as HwndSource;
+            HwndTarget hwndTarget = hwndSource.CompositionTarget;
+            if (SoftwareRenderChk.IsChecked.GetValueOrDefault(false)) {
+                hwndTarget.RenderMode = RenderMode.SoftwareOnly;
+            } else {
+                hwndTarget.RenderMode = RenderMode.Default;
+            }
+        }
+    }
+}

OverlayWindow.xaml

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+
+<Window x:Class="WpfRenderPerformance.OverlayWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="OverlayWindow" Background="Transparent" AllowsTransparency="True" WindowStyle="None" Height="350" Width="525" Loaded="OnLoaded" Closed="Window_Closed" Left="20" Top="20">
+    <Grid>
+        <Image Name="foo"/>
+    </Grid>
+</Window>

OverlayWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Interop;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace WpfRenderPerformance
+{
+    /// <summary>
+    /// Interaction logic for OverlayWindow.xaml
+    /// </summary>
+    public partial class OverlayWindow : Window
+    {
+        public OverlayWindow()
+        {
+            InitializeComponent();
+        }
+
+        WriteableBitmap wb_source_out_;
+        public void OnNewWriteableImage(Byte[] pixel)
+        {
+            App app = App.Current as App;
+
+            Dispatcher.BeginInvoke(new Action(delegate() {
+                if (app.MainWindow != null && (app.MainWindow as MainWindow).RenderChk.IsChecked.GetValueOrDefault(false)) {
+                    if (wb_source_out_ == null) {
+                        wb_source_out_ = new WriteableBitmap(640, 480, 96, 96, PixelFormats.Bgra32, null);
+                        foo.Source = wb_source_out_;
+                    }
+                    else if (foo.Source != wb_source_out_) foo.Source = wb_source_out_;
+
+                    (wb_source_out_ as WriteableBitmap).WritePixels(new System.Windows.Int32Rect(0, 0, 640, 480), pixel, 640 * 4, 0);
+                }
+            }));
+        }
+
+        private Thread worker_thread_;
+        public WpfRenderHelper.WpfRenderHelper helper_;
+        private void OnLoaded(object sender, RoutedEventArgs e)
+        {
+            helper_ = new WpfRenderHelper.WpfRenderHelper();
+            helper_.NewWriteableImage += OnNewWriteableImage;
+            worker_thread_ = new Thread(new ThreadStart(helper_.Worker));
+            worker_thread_.Start();
+        }
+
+        private void Window_Closed(object sender, EventArgs e)
+        {
+            worker_thread_.Abort();
+        }
+    }
+}

Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Resources;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("WpfRenderPerformance")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("WpfRenderPerformance")]
+[assembly: AssemblyCopyright("Copyright ©  2014")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+//In order to begin building localizable applications, set 
+//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
+//inside a <PropertyGroup>.  For example, if you are using US english
+//in your source files, set the <UICulture> to en-US.  Then uncomment
+//the NeutralResourceLanguage attribute below.  Update the "en-US" in
+//the line below to match the UICulture setting in the project file.
+
+//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
+
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+    //(used if a resource is not found in the page, 
+    // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+    //(used if a resource is not found in the page, 
+    // app, or any theme specific resource dictionaries)
+)]
+
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]