From a34644439e560c4d70972039f9b51bd75ca461fd Mon Sep 17 00:00:00 2001
From: Richard Stanway <r.stanway@gmail.com>
Date: Sun, 7 Jul 2013 21:24:27 -0400
Subject: [PATCH] Make mouse foreground window check more reliable

---
 GraphicsCapture/GraphicsCaptureSource.cpp | 13 ++++++++++++-
 GraphicsCapture/GraphicsCaptureSource.h   |  3 +++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/GraphicsCapture/GraphicsCaptureSource.cpp b/GraphicsCapture/GraphicsCaptureSource.cpp
index cad709a7..a408a4f8 100644
--- a/GraphicsCapture/GraphicsCaptureSource.cpp
+++ b/GraphicsCapture/GraphicsCaptureSource.cpp
@@ -261,6 +261,8 @@ void GraphicsCaptureSource::EndCapture()
     captureCheckInterval = -1.0f;
     hwndCapture = NULL;
     targetProcessID = 0;
+    foregroundPID = 0;
+    foregroundCheckCount = 0;
 
     if(warningID)
     {
@@ -726,7 +728,14 @@ void GraphicsCaptureSource::Render(const Vect2 &pos, const Vect2 &size)
             //----------------------------------------------------------
             // draw mouse
 
-            if(bMouseCaptured && cursorTexture && GetForegroundWindow() == hwndCapture)
+            if (!foregroundCheckCount)
+            {
+                //only check for foreground window every 10 frames since this involves two syscalls
+                GetWindowThreadProcessId(GetForegroundWindow(), &foregroundPID);
+                foregroundCheckCount = 10;
+            }
+
+            if(bMouseCaptured && cursorTexture && foregroundPID == targetProcessID)
             {
                 Vect2 newCursorPos  = Vect2(float(cursorPos.x-xHotspot), float(cursorPos.y-xHotspot));
                 Vect2 newCursorSize = Vect2(float(cursorTexture->Width()), float(cursorTexture->Height()));
@@ -748,6 +757,8 @@ void GraphicsCaptureSource::Render(const Vect2 &pos, const Vect2 &size)
 
                 DrawSprite(cursorTexture, 0xFFFFFFFF, newCursorPos.x, newCursorPos.y, newCursorPos.x+newCursorSize.x, newCursorPos.y+newCursorSize.y);
             }
+
+            foregroundCheckCount--;
         }
 
         if(lastShader)
diff --git a/GraphicsCapture/GraphicsCaptureSource.h b/GraphicsCapture/GraphicsCaptureSource.h
index 2e42bd25..e6bb87ff 100644
--- a/GraphicsCapture/GraphicsCaptureSource.h
+++ b/GraphicsCapture/GraphicsCaptureSource.h
@@ -53,6 +53,9 @@ class GraphicsCaptureSource : public ImageSource
 
     float captureCheckInterval;
 
+    DWORD foregroundPID;
+    DWORD foregroundCheckCount;
+
     void NewCapture();
     void EndCapture();