diff -r bf7481649c98 -r 7f25ef56562d windowing/windowserver/test/tauto/topaquechild.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/windowing/windowserver/test/tauto/topaquechild.cpp	Wed Jun 23 19:41:15 2010 +0300
@@ -0,0 +1,167 @@
+// 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:
+// This file is part of manual test (group\inc113743.mmp) to check Wserv behaviour when
+// exposing a transparent window that is obscured by some opaque child window above it.
+// Without the fix, that transparent window will be drawn as opaque window
+// because its transparent regions is null (not re-created due to its update flag is not
+// set as it is not traceable via transparent regions linked list of windows above it.
+// Some illustration when the situation will trigger the defect (side view),
+// ----       Child (opaque)
+// ---------- Parent (transparent)
+// ----       Other transparent window obscured by opaque child
+// This defect is only reproducable when window shadowing is not used, so it cannot be 
+// tested from standard Wserv test framework.
+// @SYMTestCaseID		GRAPHICS-WSERV-0450
+// @SYMDEF  			INC113743
+// @SYMTestCaseDesc    Perform test on Wserv behaviour in exposing transparent windows which is obscured indirectly by opaque child window
+// @SYMTestPriority    High
+// @SYMTestStatus      Implemented
+// @SYMTestActions     Create opaque and transparent windows in the following dimension and z-order
+// ----       opaque child
+// ---------- transparent parent
+// ----       other transparent underneath obscured and non traceable via transparent parent iTransparentRegions
+// and then make transparent parent window invisible
+// @SYMTestExpectedResults The expected result are: other transparent window underneath is exposed and redrawn properly not becoming opaque
+// 
+//
+
+#include <e32std.h>
+#include <w32std.h>
+#include <fbs.h>
+
+#define ENullWsHandle 0xffffffff
+
+void MainL()
+	{
+	const TSize KTestSize(320,240);
+	const TSize KHalfSize(160,240);
+	const TInt KScreenNo = 1;
+
+	RRegion shape;
+	shape.AddRect(TRect(0,0,160,120));
+	shape.AddRect(TRect(160,120,320,240));
+	CleanupClosePushL(shape);
+
+	RWsSession ws;
+	User::LeaveIfError(ws.Connect());
+	CleanupClosePushL(ws);
+
+	CWsScreenDevice* scr = new(ELeave) CWsScreenDevice(ws);
+	CleanupStack::PushL(scr);
+	User::LeaveIfError(scr->Construct(KScreenNo));
+	TDisplayMode displayMode = scr->DisplayMode();
+
+	CWindowGc* gc = NULL;
+	User::LeaveIfError(scr->CreateContext(gc));
+	CleanupStack::PushL(gc);
+
+	RWindowGroup group(ws);
+	User::LeaveIfError(group.Construct(0x0badface, ETrue));
+	CleanupClosePushL(group);
+
+	// create transparent window underneath that will be obscured by some opaque child window above it
+	RWindow transWinUnderneath(ws);
+	User::LeaveIfError(transWinUnderneath.Construct(group, ENullWsHandle));
+	CleanupClosePushL(transWinUnderneath);
+	transWinUnderneath.SetShadowDisabled(ETrue);
+	transWinUnderneath.SetExtent(TPoint(0,0),KTestSize/*KHalfSize*/);
+	transWinUnderneath.SetTransparencyAlphaChannel();
+	transWinUnderneath.SetRequiredDisplayMode(EColor64K);
+	transWinUnderneath.SetBackgroundColor(TRgb(255,0,0,128));
+	transWinUnderneath.SetShape(shape);
+	transWinUnderneath.Activate();
+	transWinUnderneath.Invalidate();
+	transWinUnderneath.BeginRedraw();
+	transWinUnderneath.EndRedraw();
+	ws.Flush();
+
+	User::After(1*1000*1000);
+
+	// save the reference image (semi-transparent red window)
+	CFbsBitmap* refImage = new(ELeave) CFbsBitmap;
+	CleanupStack::PushL(refImage);
+	User::LeaveIfError(refImage->Create(KTestSize, displayMode));
+	scr->CopyScreenToBitmap(refImage);
+
+	// create transparent window parent which will have opaque child
+	RWindow transWinParent(ws);
+	User::LeaveIfError(transWinParent.Construct(group, ENullWsHandle));
+	CleanupClosePushL(transWinParent);
+	transWinParent.SetShadowDisabled(ETrue);
+	transWinParent.SetExtent(TPoint(0,0),KTestSize);
+	transWinParent.SetTransparencyAlphaChannel();
+	transWinParent.SetRequiredDisplayMode(EColor64K);
+	transWinParent.SetBackgroundColor(TRgb(255,255,255,0));
+	transWinParent.Activate();
+
+	transWinParent.Invalidate();
+	transWinParent.BeginRedraw();
+	transWinParent.EndRedraw();
+	ws.Flush();
+		
+	// create opaque child window that obscure transparent window underneath (not its parent)
+	RWindow opaqueWinChild(ws);
+	User::LeaveIfError(opaqueWinChild.Construct(transWinParent, ENullWsHandle));
+	CleanupClosePushL(opaqueWinChild);
+	opaqueWinChild.SetExtent(TPoint(0,0),KTestSize/*KHalfSize*/);
+	opaqueWinChild.SetRequiredDisplayMode(EColor64K);
+	opaqueWinChild.SetShape(shape);
+	opaqueWinChild.Activate();
+	
+	opaqueWinChild.Invalidate();
+	opaqueWinChild.BeginRedraw();
+	gc->Activate(opaqueWinChild);
+	gc->SetBrushStyle(CGraphicsContext::ESolidBrush);
+	gc->SetPenStyle(CGraphicsContext::ENullPen);
+	gc->SetBrushColor(KRgbGreen);
+	gc->Clear();
+	gc->SetBrushColor(KRgbBlue);
+	gc->DrawEllipse(KTestSize/*KHalfSize*/);
+	gc->Deactivate();
+	opaqueWinChild.EndRedraw();
+	ws.Flush();
+
+	User::After(1*1000*1000);
+
+	// preform the test by making transparent window parent invisible
+	transWinParent.SetVisible(EFalse);
+	ws.Flush();
+
+	User::After(2*1000*1000);
+
+	// save the test image (without the fix this would be an opaque red window)
+	CFbsBitmap* testImage = new(ELeave) CFbsBitmap;
+	CleanupStack::PushL(testImage);
+	User::LeaveIfError(testImage->Create(KTestSize, displayMode));
+	scr->CopyScreenToBitmap(testImage);
+
+	_LIT(KPanicMsg, "Test Failed");
+	TInt nbytes = CFbsBitmap::ScanLineLength(KTestSize.iWidth, displayMode)*KTestSize.iHeight;
+	if (Mem::Compare((TUint8*)testImage->DataAddress(), nbytes, (TUint8*)refImage->DataAddress(), nbytes)!=0)
+		User::Panic(KPanicMsg, 0);
+
+	CleanupStack::PopAndDestroy(10, &shape);
+	}
+
+GLDEF_C TInt E32Main()
+	{
+	CTrapCleanup* cs = CTrapCleanup::New();
+	if (!cs)
+		return KErrNoMemory;
+		
+	TRAPD(err,MainL());
+
+	delete cs;
+	return err;
+	}