From 052218fc23597a3280ed062cd6d53dc8010f40b0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?G=C3=A9=20van=20Geldorp?= <ge@gse.nl>
Date: Sun, 4 Dec 2005 22:31:43 +0000
Subject: [PATCH] Limit invalidate region if required

svn path=/trunk/; revision=19894
---
 reactos/subsys/win32k/ntuser/painting.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/reactos/subsys/win32k/ntuser/painting.c b/reactos/subsys/win32k/ntuser/painting.c
index 575dc4e2135..524f39c41b3 100644
--- a/reactos/subsys/win32k/ntuser/painting.c
+++ b/reactos/subsys/win32k/ntuser/painting.c
@@ -319,6 +319,19 @@ IntInvalidateWindows(PWINDOW_OBJECT Window, HRGN hRgn, ULONG Flags)
    BOOL HadPaintMessage, HadNCPaintMessage;
    BOOL HasPaintMessage, HasNCPaintMessage;
 
+   /*
+    * If the nonclient is not to be redrawn, clip the region to the client
+    * rect
+    */
+   if (0 != (Flags & RDW_INVALIDATE) && 0 == (Flags & RDW_FRAME))
+   {
+      HRGN hRgnClient;
+
+      hRgnClient = UnsafeIntCreateRectRgnIndirect(&Window->ClientRect);
+      RgnType = NtGdiCombineRgn(hRgn, hRgn, hRgnClient, RGN_AND);
+      NtGdiDeleteObject(hRgnClient);
+   }
+
    /*
     * Clip the given region with window rectangle (or region)
     */