diff -r 000000000000 -r bde4ae8d615e os/graphics/graphicsdeviceinterface/directgdi/test/tinterleaving.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os/graphics/graphicsdeviceinterface/directgdi/test/tinterleaving.h	Fri Jun 15 03:10:57 2012 +0200
@@ -0,0 +1,57 @@
+// Copyright (c) 2007-2009 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 
+*/
+
+#ifndef __TINTERLEAVING_H__
+#define __TINTERLEAVING_H__
+
+#include "tdirectgdi_test_step_base.h"
+
+/**
+Base class for Interleaving family tests.
+*/
+class CTInterleaving : public CTDirectGdiStepBase
+	{
+public:
+	CTInterleaving();
+	~CTInterleaving();
+	
+private:
+	// Main test methods
+	void TestSyncL();
+	void TestAsyncL(TBool aDebug=EFalse);
+
+	// Helper functions
+	void DrawDirectGdiCheckboardToTarget();
+	void DrawDirectGdiBarsToTarget();
+	void DrawImageToTargetL(TSgDrawableId aImageId);
+
+	// From CStepStep
+	virtual TVerdict doTestStepPreambleL();
+	virtual TVerdict doTestStepL();	
+	virtual TVerdict doTestStepPostambleL();
+	
+	// from CTDirectGdiStepBase
+	void RunTestsL();
+	};		
+	
+_LIT(KTDirectGdiInterleavingStep,"TDirectGDIInterleaving");
+
+#endif