From 9b6add0e4010a94cbaa5c6695c38e041fd9224cf Mon Sep 17 00:00:00 2001
From: zeromus <zeromus@zeromus.org>
Date: Fri, 10 Oct 2014 00:15:15 +0000
Subject: [PATCH] basic TransformPoint work

---
 .../DisplayManager/DisplayManager.cs               | 14 ++++++++++++++
 .../DisplayManager/FilterManager.cs                | 13 +++++++++++++
 .../DisplayManager/Filters/BaseFilter.cs           | 14 ++++++++++++++
 .../DisplayManager/Filters/Gui.cs                  | 11 +++++++++++
 4 files changed, 52 insertions(+)

diff --git a/BizHawk.Client.EmuHawk/DisplayManager/DisplayManager.cs b/BizHawk.Client.EmuHawk/DisplayManager/DisplayManager.cs
index de8f62cb36..e9faa6f9e9 100644
--- a/BizHawk.Client.EmuHawk/DisplayManager/DisplayManager.cs
+++ b/BizHawk.Client.EmuHawk/DisplayManager/DisplayManager.cs
@@ -247,6 +247,20 @@ namespace BizHawk.Client.EmuHawk
 			return new Point((int)v.X, (int)v.Y);
 		}
 
+		/// <summary>
+		/// Using the current filter program, turn a emulator screen space coordinat to a window coordinate (suitable for lua layer drawing)
+		/// </summary>
+		public Point TransformPoint(Point p)
+		{
+			//now, if theres no filter program active, just give up
+			if (CurrentFilterProgram == null) return p;
+
+			//otherwise, have the filter program untransform it
+			Vector2 v = new Vector2(p.X, p.Y);
+			v = CurrentFilterProgram.TransformPoint("default", v);
+			return new Point((int)v.X, (int)v.Y);
+		}
+
 
 		/// <summary>
 		/// This will receive an emulated output frame from an IVideoProvider and run it through the complete frame processing pipeline
diff --git a/BizHawk.Client.EmuHawk/DisplayManager/FilterManager.cs b/BizHawk.Client.EmuHawk/DisplayManager/FilterManager.cs
index 0c06df233c..a14c9ba05c 100644
--- a/BizHawk.Client.EmuHawk/DisplayManager/FilterManager.cs
+++ b/BizHawk.Client.EmuHawk/DisplayManager/FilterManager.cs
@@ -94,6 +94,19 @@ namespace BizHawk.Client.EmuHawk.FilterManager
 			return point;
 		}
 
+		/// <summary>
+		/// Receives a point in the input space of the filter program and transforms it through to output points
+		/// </summary>
+		public Vector2 TransformPoint(string channel, Vector2 point)
+		{
+			for (int i = 0; i < Filters.Count; i++)
+			{
+				var filter = Filters[i];
+				point = filter.TransformPoint(channel, point);
+			}
+			return point;
+		}
+
 		public class ProgramStep
 		{
 			public ProgramStep(ProgramStepType type, object args, string comment = null)
diff --git a/BizHawk.Client.EmuHawk/DisplayManager/Filters/BaseFilter.cs b/BizHawk.Client.EmuHawk/DisplayManager/Filters/BaseFilter.cs
index 2eb011b61c..a4ce9304b7 100644
--- a/BizHawk.Client.EmuHawk/DisplayManager/Filters/BaseFilter.cs
+++ b/BizHawk.Client.EmuHawk/DisplayManager/Filters/BaseFilter.cs
@@ -51,6 +51,20 @@ namespace BizHawk.Client.EmuHawk.Filters
 			}
 			return point;
 		}
+
+		public virtual Vector2 TransformPoint(string channel, Vector2 point)
+		{
+			//base class behaviour here just uses the input and output sizes, if appropriate. few filters will have to do anything more complex
+			var input = FindInput(channel);
+			var output = FindOutput(channel);
+			if (input != null && output != null)
+			{
+				point.X *= ((float)output.SurfaceFormat.Size.Width) / (float)input.SurfaceFormat.Size.Width;
+				point.Y *= ((float)output.SurfaceFormat.Size.Height) / (float)input.SurfaceFormat.Size.Height;
+			}
+			return point;
+		}
+
 		public void SetInput(Texture2d tex)
 		{
 			InputTexture = tex;
diff --git a/BizHawk.Client.EmuHawk/DisplayManager/Filters/Gui.cs b/BizHawk.Client.EmuHawk/DisplayManager/Filters/Gui.cs
index b6a203457f..557ebee816 100644
--- a/BizHawk.Client.EmuHawk/DisplayManager/Filters/Gui.cs
+++ b/BizHawk.Client.EmuHawk/DisplayManager/Filters/Gui.cs
@@ -232,6 +232,17 @@ namespace BizHawk.Client.EmuHawk.Filters
 			return point;
 		}
 
+		public override Vector2 TransformPoint(string channel, Vector2 point)
+		{
+			if (nop)
+				return point;
+			point.X *= LL.WidthScale;
+			point.Y *= LL.HeightScale;
+			point.X += LL.vx;
+			point.Y += LL.vy;
+			return point;
+		}
+
 		public override void Run()
 		{
 			if (nop)