diff -r 000000000000 -r bde4ae8d615e os/graphics/windowing/windowserver/test/tbufferdrawer/bufferdrawer.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os/graphics/windowing/windowserver/test/tbufferdrawer/bufferdrawer.cpp	Fri Jun 15 03:10:57 2012 +0200
@@ -0,0 +1,89 @@
+// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+/**
+ @file
+ @test
+ @internalComponent - Internal Symbian test code
+*/
+
+#include "bufferdrawer.h"
+#include <s32mem.h>
+#include <s32strm.h>
+#include <fbs.h>
+#include <bitdev.h>
+#include <bitstd.h>
+#include <graphics/wsgraphicscontext.h>
+#include <graphics/wsuibuffer.h>
+
+
+// CWsGraphicDrawer	
+CWsBufferGraphicDrawer* CWsBufferGraphicDrawer::NewL()
+	{
+	return new(ELeave) CWsBufferGraphicDrawer;	
+	}
+	
+CWsBufferGraphicDrawer::~CWsBufferGraphicDrawer()
+	{
+	}
+
+void CWsBufferGraphicDrawer::ConstructL(MWsGraphicDrawerEnvironment& aEnv, const TGraphicDrawerId& aId, MWsClient& aOwner, const TDesC8& /*aData*/)
+	{
+	BaseConstructL(aEnv, aId, aOwner);
+ 	// default white line number
+	iWhiteLinePos = 0;
+ 	}
+
+void CWsBufferGraphicDrawer::HandleMessage(const TDesC8& aData)
+	{
+	TInt linePos = aData[0];
+	DoUpdateWhiteLinePos(linePos);
+	}
+
+void CWsBufferGraphicDrawer::DoUpdateWhiteLinePos(TInt aWhiteLinePos)
+	{
+	iWhiteLinePos = aWhiteLinePos;
+	// Invalidate the redrawing
+	Invalidate();
+	}
+
+void CWsBufferGraphicDrawer::DoDraw(MWsGc& aGc, const TRect& aRect, const TDesC8& /*aData*/) const
+	{
+	MWsGraphicsContext* context = static_cast<MWsGraphicsContext*>(aGc.ResolveObjectInterface(KMWsGraphicsContext));
+	
+	//Draw a filled rect with the chosen color
+	context->Push();
+	context->SetBrushStyle(MWsGraphicsContext::ESolidBrush);
+	context->SetBrushColor(KRgbBlue);
+	context->DrawRect(aRect);
+	context->Pop();
+	
+	//Obtain access to the screen/OSB buffer
+	MWsUiBuffer* buffer = static_cast<MWsUiBuffer*>(aGc.ResolveObjectInterface(KMWsUiBufferInterfaceId));
+	TAny* data;
+	TInt stride;
+	
+	TInt err = buffer->MapReadWrite(data, stride);
+	
+	if (err == KErrNone)
+		{
+		//Fill the chosen line with white
+		TUint8* scanLine = static_cast<TUint8*>(data);
+		scanLine += stride * iWhiteLinePos;
+		Mem::Fill(scanLine, stride, 0xFF);
+	
+		buffer->Unmap();
+		}
+	}