BizHawk/BizHawk.MultiClient/DisplayManager/DisplayManager.cs

using System;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;

//using dx=SlimDX;
//using d3d=SlimDX.Direct3D9;

namespace BizHawk.MultiClient
{
	/// <summary>
	/// encapsulates thread-safe concept of pending/current display surfaces, reusing buffers where matching 
	/// sizes are available and keeping them cleaned up when they dont seem like theyll need to be used anymore
	/// </summary>
	class SwappableDisplaySurfaceSet
	{
		DisplaySurface Pending, Current;
		Queue<DisplaySurface> ReleasedSurfaces = new Queue<DisplaySurface>();

		/// <summary>
		/// retrieves a surface with the specified size, reusing an old buffer if available and clearing if requested
		/// </summary>
		public DisplaySurface AllocateSurface(int width, int height, bool needsClear = true)
		{
			for (; ; )
			{
				DisplaySurface trial;
				lock (this)
				{
					if (ReleasedSurfaces.Count == 0) break;
					trial = ReleasedSurfaces.Dequeue();
				}
				if (trial.Width == width && trial.Height == height)
				{
					if (needsClear) trial.Clear();
					return trial;
				}
				trial.Dispose();
			}
			return new DisplaySurface(width, height);
		}

		/// <summary>
		/// sets the provided buffer as pending. takes control of the supplied buffer
		/// </summary>
		public void SetPending(DisplaySurface newPending)
		{
			lock (this)
			{
				if (Pending != null) ReleasedSurfaces.Enqueue(Pending);
				Pending = newPending;
			}
		}

		public void ReleaseSurface(DisplaySurface surface)
		{
			lock (this) ReleasedSurfaces.Enqueue(surface);
		}

		/// <summary>
		/// returns the current buffer, making the most recent pending buffer (if there is such) as the new current first.
		/// </summary>
		public DisplaySurface GetCurrent()
		{
			lock (this)
			{
				if (Pending != null)
				{
					if (Current != null) ReleasedSurfaces.Enqueue(Current);
					Current = Pending;
					Pending = null;
				}
			}
			return Current;
		}
	}


	public interface IDisplayFilter
	{
		/// <summary>
		/// describes how this filter will respond to an input format
		/// </summary>
		DisplayFilterAnalysisReport Analyze(Size sourceSize);

		/// <summary>
		/// runs the filter
		/// </summary>
		DisplaySurface Execute(DisplaySurface surface);
	}

	public class DisplayFilterAnalysisReport
	{
		public bool Success;
		public Size OutputSize;
	}

	interface IDisplayDriver
	{

	}

	class Direct3DDisplayDriver : IDisplayDriver
	{
	}

	public unsafe class DisplaySurface : IDisposable
	{
		Bitmap bmp;
		BitmapData bmpdata;
		int[] pixels;

		public unsafe void Clear()
		{
			FromBitmap(false);
			Util.memset(PixelPtr, 0, Stride * Height);
		}

		public Bitmap PeekBitmap()
		{
			ToBitmap();
			return bmp;
		}

		/// <summary>
		/// returns a Graphics object used to render to this surface. be sure to dispose it!
		/// </summary>
		public Graphics GetGraphics()
		{
			ToBitmap();
			return Graphics.FromImage(bmp);
		}

		public unsafe void ToBitmap(bool copy=true)
		{
			if (isBitmap) return;
			isBitmap = true;

			if (bmp == null)
			{
				bmp = new Bitmap(Width, Height, PixelFormat.Format32bppArgb);
			}

			if (copy)
			{
				bmpdata = bmp.LockBits(new Rectangle(0, 0, Width, Height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);

				int w = Width;
				int h = Height;
				int stride = bmpdata.Stride / 4;
				int* bmpbuf = (int*)bmpdata.Scan0.ToPointer();
				for (int y = 0, i = 0; y < h; y++)
					for (int x = 0; x < w; x++)
						bmpbuf[y * stride + x] = pixels[i++];

				bmp.UnlockBits(bmpdata);
			}

		}

		public bool IsBitmap { get { return isBitmap; } }
		bool isBitmap = false;

		public unsafe void FromBitmap(bool copy=true)
		{
			if (!isBitmap) return;
			isBitmap = false;

			if (copy)
			{
				bmpdata = bmp.LockBits(new Rectangle(0, 0, Width, Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);

				int w = Width;
				int h = Height;
				int stride = bmpdata.Stride / 4;
				int* bmpbuf = (int*)bmpdata.Scan0.ToPointer();
				for (int y = 0, i = 0; y < h; y++)
					for (int x = 0; x < w; x++)
						pixels[i++] = bmpbuf[y * stride + x];

				bmp.UnlockBits(bmpdata);
			}
		}


		public static DisplaySurface DisplaySurfaceWrappingBitmap(Bitmap bmp)
		{
			DisplaySurface ret = new DisplaySurface();
			ret.Width = bmp.Width;
			ret.Height = bmp.Height;
			ret.bmp = bmp;
			ret.isBitmap = true;
			return ret;
		}

		private DisplaySurface() 
		{
		}

		public DisplaySurface(int width, int height)
		{
			//can't create a bitmap with zero dimensions, so for now, just bump it up to one
			if (width == 0) width = 1;
			if (height == 0) height = 1; 
			
			Width = width;
			Height = height;

			pixels = new int[width * height];
			LockPixels();
		}

		public int* PixelPtr { get { return (int*)ptr; } }
		public IntPtr PixelIntPtr { get { return new IntPtr(ptr); } }
		public int Stride { get { return Width*4; } }
		public int OffsetOf(int x, int y) { return y * Stride + x*4; }

		void* ptr;
		GCHandle handle;
		void LockPixels()
		{
			UnlockPixels();
			handle = GCHandle.Alloc(pixels, GCHandleType.Pinned);
			ptr = handle.AddrOfPinnedObject().ToPointer();
		}

		void UnlockPixels()
		{
			if(handle.IsAllocated) handle.Free();
		}

		/// <summary>
		/// returns a new surface 
		/// </summary>
		/// <param name="xpad"></param>
		/// <param name="ypad"></param>
		/// <returns></returns>
		public DisplaySurface ToPaddedSurface(int xpad0, int ypad0, int xpad1, int ypad1)
		{
			int new_width = Width + xpad0 + xpad1;
			int new_height = Height + ypad0 + ypad1;
			DisplaySurface ret = new DisplaySurface(new_width, new_height);
			int* dptr = ret.PixelPtr;
			int* sptr = PixelPtr;
			int dstride = ret.Stride / 4;
			int sstride = Stride / 4;
			for (int y = 0; y < Height; y++)
				for (int x = 0; x < Width; x++)
				{
					dptr[(y + ypad0) * dstride + x + xpad0] = sptr[y * sstride + x];
				}
			return ret;

		}

		public int Width { get; private set; }
		public int Height { get; private set; }

		public void Dispose()
		{
			if (bmp != null)
				bmp.Dispose();
			bmp = null;
			UnlockPixels();
		}

		//public unsafe int[] ToIntArray() { }

		public void AcceptIntArray(int[] newpixels)
		{
			FromBitmap(false);
			UnlockPixels();
			pixels = newpixels;
			LockPixels();
		}
	}


	public class OSDManager
	{
		public string FPS { get; set; }
		public string MT { get; set; }
		IBlitterFont MessageFont;
		IBlitterFont AlertFont;
		public void Dispose()
		{

		}

		public void Begin(IBlitter blitter)
		{
			MessageFont = blitter.GetFontType("MessageFont");
			AlertFont = blitter.GetFontType("AlertFont");
		}

		public System.Drawing.Color FixedMessagesColor { get { return System.Drawing.Color.FromArgb(Global.Config.MessagesColor); } }
		public System.Drawing.Color FixedAlertMessageColor { get { return System.Drawing.Color.FromArgb(Global.Config.AlertMessageColor); } }

		public OSDManager()
		{
		}

		private float GetX(IBlitter g, int x, int anchor, IBlitterFont font, string message)
		{
			var size = g.MeasureString(message, font);
			//Rectangle rect = g.MeasureString(Sprite, message, new DrawTextFormat());
			switch (anchor)
			{
				default:
				case 0: //Top Left
				case 2: //Bottom Left
					return x;
				case 1: //Top Right
				case 3: //Bottom Right
					return g.ClipBounds.Width - x - size.Width;
			}
		}

		private float GetY(IBlitter g, int y, int anchor, IBlitterFont font, string message)
		{
			var size = g.MeasureString(message, font);
			switch (anchor)
			{
				default:
				case 0: //Top Left
				case 1: //Top Right
					return y;
				case 2: //Bottom Left
				case 3: //Bottom Right
					return g.ClipBounds.Height - y - size.Height;
			}
		}



		private string MakeFrameCounter()
		{
			if (Global.MovieSession.Movie.IsFinished)
			{
				return Global.Emulator.Frame.ToString() + "/" + Global.MovieSession.Movie.Frames.ToString() + " (Finished)";
			}
			else if (Global.MovieSession.Movie.IsPlaying)
			{
				return Global.Emulator.Frame.ToString() + "/" + Global.MovieSession.Movie.Frames.ToString();
			}
			else if (Global.MovieSession.Movie.IsRecording)
			{
				return Global.Emulator.Frame.ToString();
			}
			else
			{
				return Global.Emulator.Frame.ToString();
			}
		}

		private string MakeLagCounter()
		{
			return Global.Emulator.LagCount.ToString();
		}

		private List<UIMessage> messages = new List<UIMessage>(5);
		private List<UIDisplay> GUITextList = new List<UIDisplay>();

		public void AddMessage(string message)
		{
			messages.Add(new UIMessage { Message = message, ExpireAt = DateTime.Now + TimeSpan.FromSeconds(2) });
		}

		public void AddGUIText(string message, int x, int y, bool alert, Color BackGround, Color ForeColor, int anchor)
		{
			GUITextList.Add(new UIDisplay { Message = message, X = x, Y = y, BackGround = BackGround, ForeColor = ForeColor, Alert = alert, Anchor = anchor });
		}

		public void ClearGUIText()
		{
			GUITextList.Clear();
		}


		public void DrawMessages(IBlitter g)
		{
			if (!Global.ClientControls["MaxTurbo"])
			{
				messages.RemoveAll(m => DateTime.Now > m.ExpireAt);
				int line = 1;
				if (Global.Config.StackOSDMessages)
				{
					for (int i = messages.Count - 1; i >= 0; i--, line++)
					{
						float x = GetX(g, Global.Config.DispMessagex, Global.Config.DispMessageanchor, MessageFont, messages[i].Message);
						float y = GetY(g, Global.Config.DispMessagey, Global.Config.DispMessageanchor, MessageFont, messages[i].Message);
						if (Global.Config.DispMessageanchor < 2)
						{
							y += ((line - 1) * 18);
						}
						else
						{
							y -= ((line - 1) * 18);
						}
						g.DrawString(messages[i].Message, MessageFont, Color.Black, x + 2, y + 2);
						g.DrawString(messages[i].Message, MessageFont, FixedMessagesColor, x, y);
					}
				}
				else
				{
					if (messages.Count > 0)
					{
						int i = messages.Count - 1;
						
						float x = GetX(g, Global.Config.DispMessagex, Global.Config.DispMessageanchor, MessageFont, messages[i].Message);
						float y = GetY(g, Global.Config.DispMessagey, Global.Config.DispMessageanchor, MessageFont, messages[i].Message);
						if (Global.Config.DispMessageanchor < 2)
						{
							y += ((line - 1) * 18);
						}
						else
						{
							y -= ((line - 1) * 18);
						}
						g.DrawString(messages[i].Message, MessageFont, Color.Black, x + 2, y + 2);
						g.DrawString(messages[i].Message, MessageFont, FixedMessagesColor, x, y);
					}
				}

				for (int x = 0; x < GUITextList.Count; x++)
				{
					try
					{
						float posx = GetX(g, GUITextList[x].X, GUITextList[x].Anchor, MessageFont, GUITextList[x].Message);
						float posy = GetY(g, GUITextList[x].Y, GUITextList[x].Anchor, MessageFont, GUITextList[x].Message);

						g.DrawString(GUITextList[x].Message, MessageFont, GUITextList[x].BackGround, posx + 2, posy + 2);
						//g.DrawString(GUITextList[x].Message, MessageFont, Color.Gray, posx + 1, posy + 1);

						if (GUITextList[x].Alert)
							g.DrawString(GUITextList[x].Message, MessageFont, FixedMessagesColor, posx, posy);
						else
							g.DrawString(GUITextList[x].Message, MessageFont, GUITextList[x].ForeColor, posx, posy);
					}
					catch (Exception)
					{
						return;
					}
				}
			}
		}


		public string MakeInputDisplay()
		{
			StringBuilder s;
			if (!Global.MovieSession.Movie.IsActive || Global.MovieSession.Movie.IsFinished)
			{
				s = new StringBuilder(Global.GetOutputControllersAsMnemonic());
			}
			else
			{
				s = new StringBuilder(Global.MovieSession.Movie.GetInput(Global.Emulator.Frame - 1));
			}

			s.Replace(".", " ").Replace("|", "").Replace("l", ""); //Note: if l is ever a mnemonic this will squash it.  But this is done because on the NES core I put l in the command mnemonic to indicate lag (was a bad a idea)
			
			return s.ToString();
		}

		public string MakeRerecordCount()
		{
			if (Global.MovieSession.Movie.IsActive)
			{
				return "Rerecord Count: " + Global.MovieSession.Movie.Rerecords.ToString();
			}
			else
			{
				return "";
			}
		}

		/// <summary>
		/// Display all screen info objects like fps, frame counter, lag counter, and input display
		/// </summary>
		public void DrawScreenInfo(IBlitter g)
		{
			if (Global.Config.DisplayFrameCounter)
			{
				string message = MakeFrameCounter();
				float x = GetX(g, Global.Config.DispFrameCx, Global.Config.DispFrameanchor, MessageFont, message);
				float y = GetY(g, Global.Config.DispFrameCy, Global.Config.DispFrameanchor, MessageFont, message);
				g.DrawString(message, MessageFont, Color.Black, x + 1, y + 1);
					g.DrawString(message, MessageFont, Color.FromArgb(Global.Config.MessagesColor), x, y);
			}
			if (Global.Config.DisplayInput)
			{
				string input = MakeInputDisplay();
				Color c;
				float x = GetX(g, Global.Config.DispInpx, Global.Config.DispInpanchor, MessageFont, input);
				float y = GetY(g, Global.Config.DispInpy, Global.Config.DispInpanchor, MessageFont, input);
				if (Global.MovieSession.Movie.IsPlaying && !Global.MovieSession.Movie.IsRecording)
				{
					c = Color.FromArgb(Global.Config.MovieInput);
				}
				else
				{
					c = Color.FromArgb(Global.Config.MessagesColor);
				}

				g.DrawString(input, MessageFont, Color.Black, x+1,y+1);
				g.DrawString(input, MessageFont, c, x,y);
			}
			if (Global.MovieSession.MultiTrack.IsActive)
			{
				g.DrawString(MT, MessageFont, Color.Black,
				Global.Config.DispFPSx + 1, //TODO: Multitrack position variables
					Global.Config.DispFPSy + 1);
				g.DrawString(MT, MessageFont, FixedMessagesColor,
					Global.Config.DispFPSx, //TODO: Multitrack position variables
					Global.Config.DispFPSy);
			}
			if (Global.Config.DisplayFPS && FPS != null)
			{
				float x = GetX(g, Global.Config.DispFPSx, Global.Config.DispFPSanchor, MessageFont, FPS);
				float y = GetY(g, Global.Config.DispFPSy, Global.Config.DispFPSanchor, MessageFont, FPS);
				g.DrawString(FPS, MessageFont, Color.Black, x + 1, y + 1);
				g.DrawString(FPS, MessageFont, FixedMessagesColor, x, y);
			}

			if (Global.Config.DisplayLagCounter)
			{
				string counter = MakeLagCounter();

				if (Global.Emulator.IsLagFrame)
				{
					float x = GetX(g, Global.Config.DispLagx, Global.Config.DispLaganchor, AlertFont, counter);
					float y = GetY(g, Global.Config.DispLagy, Global.Config.DispLaganchor, AlertFont, counter);
					g.DrawString(counter, AlertFont, Color.Black, x + 1, y + 1);
					g.DrawString(counter, AlertFont, FixedAlertMessageColor, x, y);
				}
				else
				{
					float x = GetX(g, Global.Config.DispLagx, Global.Config.DispLaganchor, MessageFont, counter);
					float y = GetY(g, Global.Config.DispLagy, Global.Config.DispLaganchor, MessageFont, counter);
					g.DrawString(counter, MessageFont, Color.Black, x + 1, y + 1);
					g.DrawString(counter, MessageFont, FixedMessagesColor, x , y );
				}

			}
			if (Global.Config.DisplayRerecordCount)
			{
				string rerec = MakeRerecordCount();
				float x = GetX(g, Global.Config.DispRecx, Global.Config.DispRecanchor, MessageFont, rerec);
				float y = GetY(g, Global.Config.DispRecy, Global.Config.DispRecanchor, MessageFont, rerec);
				g.DrawString(rerec, MessageFont, Color.Black, x + 1, y + 1);
				g.DrawString(rerec, MessageFont, FixedMessagesColor, x, y);
			}

			if (Global.ClientControls["Autohold"])
			{
				StringBuilder disp = new StringBuilder("Held: ");
				foreach (string s in Global.StickyXORAdapter.CurrentStickies)
				{
					disp.Append(s);
					disp.Append(' ');
				}

				foreach (string s in Global.AutofireStickyXORAdapter.CurrentStickies)
				{
					disp.Append("Auto-");
					disp.Append(s);
					disp.Append(' ');
				}

				g.DrawString(disp.ToString(), MessageFont, Color.White, GetX(g, Global.Config.DispAutoholdx, Global.Config.DispAutoholdanchor, MessageFont, 
					disp.ToString()), GetY(g, Global.Config.DispAutoholdy, Global.Config.DispAutoholdanchor, MessageFont, disp.ToString()));
			}

			//TODO
			//if (Global.MovieSession.Movie.IsPlaying)
			//{
			//    //int r = (int)g.ClipBounds.Width;
			//    //Point[] p = { new Point(r - 20, 2), 
			//    //				new Point(r - 4, 12), 
			//    //				new Point(r - 20, 22) };
			//    //g.FillPolygon(new SolidBrush(Color.Red), p);
			//    //g.DrawPolygon(new Pen(new SolidBrush(Color.Pink)), p);

			//}
			//else if (Global.MovieSession.Movie.IsRecording)
			//{
			//    //g.FillEllipse(new SolidBrush(Color.Red), new Rectangle((int)g.ClipBounds.Width - 22, 2, 20, 20));
			//    //g.DrawEllipse(new Pen(new SolidBrush(Color.Pink)), new Rectangle((int)g.ClipBounds.Width - 22, 2, 20, 20));
			//}

			if (Global.MovieSession.Movie.IsActive && Global.Config.DisplaySubtitles)
			{
				List<Subtitle> s = Global.MovieSession.Movie.Subtitles.GetSubtitles(Global.Emulator.Frame);
				if (s == null)
				{
					return;
				}

				for (int i = 0; i < s.Count; i++)
				{
					g.DrawString(s[i].Message, MessageFont, Color.Black, s[i].X + 1, s[i].Y + 1);
					g.DrawString(s[i].Message, MessageFont, Color.FromArgb((int)s[i].Color), s[i].X, s[i].Y);
				}
			}
		}
	}

	public class DisplayManager : IDisposable
	{
		public DisplayManager()
		{
			//have at least something here at the start
			luaNativeSurfacePreOSD = new DisplaySurface(1, 1); 
		}

		volatile bool VsyncToggle = false;
		volatile bool VsyncRequested = false;
		SwappableDisplaySurfaceSet sourceSurfaceSet = new SwappableDisplaySurfaceSet();


		DisplaySurface luaEmuSurface = null;
		public void PreFrameUpdateLuaSource()
		{
			luaEmuSurface = luaEmuSurfaceSet.GetCurrent();
		}

		/// <summary>update Global.RenderPanel from the passed IVideoProvider</summary>
		public void UpdateSource(IVideoProvider videoProvider)
		{
			UpdateSourceEx(videoProvider, Global.RenderPanel);
		}

		/// <summary>
		/// update the passed IRenderer with the passed IVideoProvider
		/// </summary>
		/// <param name="videoProvider"></param>
		/// <param name="renderPanel">also must implement IBlitter</param>
		public void UpdateSourceEx(IVideoProvider videoProvider, IRenderer renderPanel)
		{
			var newPendingSurface = sourceSurfaceSet.AllocateSurface(videoProvider.BufferWidth, videoProvider.BufferHeight, false);
			newPendingSurface.AcceptIntArray(videoProvider.GetVideoBuffer());
			sourceSurfaceSet.SetPending(newPendingSurface);
		
			if (renderPanel == null) return;

			currNativeWidth = renderPanel.NativeSize.Width;
			currNativeHeight = renderPanel.NativeSize.Height;

			currentSourceSurface = sourceSurfaceSet.GetCurrent();

			if (currentSourceSurface == null) return;

			//if we're configured to use a scaling filter, apply it now
			//SHOULD THIS BE RUN REPEATEDLY?
			//some filters may need to run repeatedly (temporal interpolation, ntsc scanline field alternating)
			//but its sort of wasted work.
			CheckFilter();

			int w = currNativeWidth;
			int h = currNativeHeight;

			
			DisplaySurface luaSurface = luaNativeSurfaceSet.GetCurrent();

			//do we have anything to do?
			//bool complexComposite = false;
			//if (luaEmuSurface != null) complexComposite = true;
			//if (luaSurface != null) complexComposite = true;

			DisplaySurface surfaceToRender = filteredSurface;
			if (surfaceToRender == null) surfaceToRender = currentSourceSurface;

			renderPanel.Clear(Color.FromArgb(videoProvider.BackgroundColor));
			renderPanel.Render(surfaceToRender);
			if (luaEmuSurface != null)
			{
				renderPanel.RenderOverlay(luaEmuSurface);
			}

			RenderOSD((IBlitter)renderPanel);

			renderPanel.Present();

			if (filteredSurface != null)
				filteredSurface.Dispose();
			filteredSurface = null;
		}

		public bool Disposed { get; private set; }

		public void Dispose()
		{
			if (Disposed) return;
			Disposed = true;
		}

		DisplaySurface currentSourceSurface, filteredSurface;

		//the surface to use to render a lua layer at native resolution (under the OSD)
		DisplaySurface luaNativeSurfacePreOSD;


		SwappableDisplaySurfaceSet luaNativeSurfaceSet = new SwappableDisplaySurfaceSet();
		public void SetLuaSurfaceNativePreOSD(DisplaySurface surface) { luaNativeSurfaceSet.SetPending(surface); }
		public DisplaySurface GetLuaSurfaceNative()
		{
			return luaNativeSurfaceSet.AllocateSurface(currNativeWidth, currNativeHeight);
		}

		SwappableDisplaySurfaceSet luaEmuSurfaceSet = new SwappableDisplaySurfaceSet();
		public void SetLuaSurfaceEmu(DisplaySurface surface) { luaEmuSurfaceSet.SetPending(surface); }
		public DisplaySurface GetLuaEmuSurfaceEmu()
		{
			int width = 1, height = 1;
			if (currentSourceSurface != null)
				width = currentSourceSurface.Width;
			if (currentSourceSurface != null)
				height = currentSourceSurface.Height;
			return luaEmuSurfaceSet.AllocateSurface(width, height);
		}

		int currNativeWidth, currNativeHeight;
	

		/// <summary>
		/// suspends the display manager so that tricky things can be changed without the display thread going in and getting all confused and hating
		/// </summary>
		public void Suspend()
		{
		}

		/// <summary>
		/// resumes the display manager after a suspend
		/// </summary>
		public void Resume()
		{
		}

		void RenderOSD(IBlitter renderPanel)
		{
			Global.OSD.Begin(renderPanel);
			renderPanel.Open();
			Global.OSD.DrawScreenInfo(renderPanel);
			Global.OSD.DrawMessages(renderPanel);
			renderPanel.Close();
		}

		void CheckFilter()
		{
			IDisplayFilter filter = null;
			switch (Global.Config.TargetDisplayFilter)
			{
				case 0:
					//no filter
					break;
				case 1:
					filter = new Hq2xBase_2xSai();
					break;
				case 2:
					filter = new Hq2xBase_Super2xSai();
					break;
				case 3:
					filter = new Hq2xBase_SuperEagle();
					break;
			
			}
			if (filter == null)
				filteredSurface = null;
			else
				filteredSurface = filter.Execute(currentSourceSurface);
		}

		SwappableDisplaySurfaceSet nativeDisplaySurfaceSet = new SwappableDisplaySurfaceSet();

		Thread displayThread;
	}
}