From 4cbf6de41a9c6935ee7f2739b4e43c555105e37b Mon Sep 17 00:00:00 2001
From: abd <abd@opencascade.com>
Date: Thu, 30 Oct 2008 11:32:38 +0000
Subject: [PATCH] Removing flicker on resizing 3D view on Win32

---
 src/OCCViewer/OCCViewer_VService.cxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/OCCViewer/OCCViewer_VService.cxx b/src/OCCViewer/OCCViewer_VService.cxx
index 77ef0aced..f4d4fc0ec 100755
--- a/src/OCCViewer/OCCViewer_VService.cxx
+++ b/src/OCCViewer/OCCViewer_VService.cxx
@@ -32,6 +32,7 @@
 #include <WNT_GraphicDevice.hxx>
 #include <WNT_GraphicDevice.hxx>
 #include <WNT_WDriver.hxx>
+#include <InterfaceGraphic_WNT.hxx>
 #else
 #include <Xw_Window.hxx>
 #include <Graphic3d_GraphicDevice.hxx>
@@ -89,6 +90,8 @@ void OCCViewer_VService::SetWindow( const Handle(V3d_View)& view,
 #ifdef WNT
   Handle(WNT_Window) w =
       new WNT_Window( Handle(Graphic3d_WNTGraphicDevice)::DownCast(view->Viewer()->Device()), hiwin, lowin );
+  // Prevent flicker
+  w->SetFlags( WDF_NOERASEBKGRND );
 #else
   Handle(Xw_Window) w =
       new Xw_Window( Handle(Graphic3d_GraphicDevice)::DownCast(view->Viewer()->Device()), hiwin, lowin, quality );
-- 
2.39.2