--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/windowing/windowserver/nonnga/SERVER/redrawmsgwindow.cpp	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,1707 @@
+// Copyright (c) 1995-2009 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:
+// Window redraw code, three sorts of redrawing are supported
+// CRedrawMsgWindow handles it via sending a redraw message to the client
+// 
+//
+
+#include "redrawmsgwindow.h"
+#include "gc.h"
+#include "playbackgc.h"
+#include "inifile.h"
+#include "rootwin.h"
+#include "wstop.h"
+#include "ANIM.H"
+#include "EVQUEUE.H"
+#include <s32mem.h>
+#include <gdi.h>
+#include "panics.h"
+#include "rootwin.h"
+#include "EVENT.H"
+#include "wsfont.h"
+#include <graphics/wsgraphicdrawerinterface.h>
+#include "../debuglog/DEBUGLOG.H"
+
+const TUint KDrawBufferGranularity = 240;
+const TInt KRedrawRegionGranularity = 8;
+const TInt KReadBufferMaxLen=0x100;
+const TInt KRegionCompressThreshold = 6; // number of rectangles in region at which we try to compress it
+
+/** Max number of non-redraw segments allowed before starting to throw away the oldest */
+const TInt KNonRedrawSegMaxLimit = 16;
+/** The number of non-redraw segments to spare from deletion once their number 
+    have grown beyond KNonRedrawSegMaxLimit */
+const TInt KNonRedrawSegThreshold = 8;
+
+TInt CWsRedrawMsgWindow::iNonRedrawAgeLimit = 0;
+CWsRedrawMsgWindow::TAtomicityType CWsRedrawMsgWindow::iAtomicity = ENoAtomicity;
+
+#if defined(__WINS__) && defined(_DEBUG)
+#   include "offscreenbitmap.h"
+#	define DEBUGOSB { CWsOffScreenBitmap * ofb = Screen()->OffScreenBitmap(); if (ofb) ofb->Update(); }
+#else
+#	define DEBUGOSB
+#endif
+
+#ifndef _DEBUG
+
+#define LOG_WINDOW_REDRAW_START(wswin,region)
+#define LOG_WINDOW_REDRAW_END(wswin)
+#define LOG_REDRAW_SEGMENT(segmentIndex,segmentType) 
+#define LOG_REDRAW_SEGMENT_REGION(region)
+#define LOG_PLAYBACK_GC_COMMAND(opcode,data)
+
+#else
+
+#define LOG_WINDOW_REDRAW_START(wswin,region) LogDrawCommandsStart(wswin,region)
+#define LOG_WINDOW_REDRAW_END(wswin) LogDrawCommandsEnd(wswin)
+#define LOG_REDRAW_SEGMENT(segmentIndex,segmentType) LogRedrawSegment(segmentIndex, segmentType)
+#define LOG_REDRAW_SEGMENT_REGION(region) {if(wsDebugLog){ LogRegion(region);}}
+#define LOG_PLAYBACK_GC_COMMAND(opcode,data)    {if (wsDebugLog) {wsDebugLog->Command(WS_HANDLE_GC, opcode, data, NULL);}}
+
+extern CDebugLogBase *wsDebugLog;
+
+class TTruncateOverflow : public TDesOverflow
+	{
+	public:
+	virtual void Overflow(TDes&) {};
+	};
+
+LOCAL_C void LogRedrawSegment(TUint aSegmentIndex, CWsRedrawMsgWindow::TRedrawSegmentType aSegmentType)
+	{
+	if (wsDebugLog)
+		{
+		TBuf<LogTBufSize> log;
+		TTruncateOverflow overflow;
+		_LIT(KLogRedrawSegment, ">> CRedrawSegment[%d] ");
+		log.AppendFormat(KLogRedrawSegment, &overflow, aSegmentIndex);
+		_LIT(KLogRedrawSegmentPending, "Pending");
+		_LIT(KLogRedrawSegmentRedraw, "Redraw");
+		_LIT(KLogRedrawSegmentNonRedraw, "NonRedraw");
+		switch(aSegmentType)
+			{
+			case CWsRedrawMsgWindow::ESegmentTypePendingRedraw :
+				log.AppendFormat(KLogRedrawSegmentPending, &overflow);
+				break;
+			case CWsRedrawMsgWindow::ESegmentTypeRedraw :
+				log.AppendFormat(KLogRedrawSegmentRedraw, &overflow);
+				break;
+			case CWsRedrawMsgWindow::ESegmentTypeNonRedraw :
+				log.AppendFormat(KLogRedrawSegmentNonRedraw, &overflow);
+			break;
+			default :
+				{
+				}
+			}
+		wsDebugLog->MiscMessage(CDebugLogBase::ELogEverything, log);
+		}
+	}
+
+LOCAL_C void LogRegion(const TRegion* aRegion)
+	{
+	TBuf<LogTBufSize> log;
+	TTruncateOverflow overflow;
+	TInt rectCount = (aRegion == NULL ? 0 : aRegion->Count());
+	log.AppendFormat(_L("region [%d,"), &overflow, rectCount);
+	if (rectCount > 0)
+		{
+		const TRect* rectangles = aRegion->RectangleList();
+		TBuf<1> comma;
+		for (TInt ii = 0; ii < rectCount; ii++)
+			{
+			TRect current = rectangles[ii];
+			log.AppendFormat(_L("%S{{%d,%d},{%d,%d}}"), &overflow, &comma,
+	                         current.iTl.iX,current.iTl.iY,current.iBr.iX,current.iBr.iY);
+			comma = _L(",");
+			}
+		}
+	else
+		{
+		log.AppendFormat(_L("NULL"), &overflow);
+		}
+	log.AppendFormat(_L("]"), &overflow);
+	wsDebugLog->MiscMessage(CDebugLogBase::ELogEverything, log);
+	}
+
+LOCAL_C void LogDrawCommandsStart(const CWsWindow* aWsWin, const TRegion* aRegion)
+	{
+	if (wsDebugLog)
+		{
+		_LIT(KLogDrawCommandsStart, ">> CWsRedrawMsgWindow::DrawCommandsL() [%S][app %d] RWindow[%d]");
+		const TDesC& clientName = aWsWin->WsOwner()->Client().FullName();
+		TBuf<LogTBufSize> log;
+		TTruncateOverflow overflow;
+		log.AppendFormat(KLogDrawCommandsStart, &overflow, &clientName, aWsWin->WsOwner()->ConnectionHandle(), aWsWin->LogHandle());
+		wsDebugLog->MiscMessage(CDebugLogBase::ELogEverything, log);
+		LogRegion(aRegion);
+		}
+	}
+
+LOCAL_C void LogDrawCommandsEnd(const CWsWindow* aWsWin)
+	{
+	if (wsDebugLog)
+		{
+		_LIT(KLogDrawCommandsEnd, "<< CWsRedrawMsgWindow::DrawCommandsL() [%S][app %d] RWindow[%d]");
+		const TDesC& clientName = aWsWin->WsOwner()->Client().FullName();
+		TBuf<LogTBufSize> log;
+		TTruncateOverflow overflow;
+		log.AppendFormat(KLogDrawCommandsEnd, &overflow, &clientName, aWsWin->WsOwner()->ConnectionHandle(), aWsWin->LogHandle());		
+		wsDebugLog->MiscMessage(CDebugLogBase::ELogEverything, log);
+		}
+	}
+
+#endif
+
+//
+// Redraw windows //
+//
+
+CWsRedrawMsgWindow::CRedrawSegment::CRedrawSegment()
+	{
+	}
+
+CWsRedrawMsgWindow::CRedrawSegment* CWsRedrawMsgWindow::CRedrawSegment::NewLC(const TRect& aRect, TRedrawSegmentType aNewRegionType)
+	{
+	CRedrawSegment* self = new (ELeave) CRedrawSegment();
+	CleanupStack::PushL(self);
+	self->ConstructL(aRect, aNewRegionType);
+	return self;
+	}
+
+void CWsRedrawMsgWindow::StaticInitL()
+	{
+	_LIT(KNonRedrawAgeLimit, "NONREDRAWAGELIMIT");
+	const TInt KDefaultNonRedrawAgeLimit = 1000000;
+	if (!WsIniFile->FindVar(KNonRedrawAgeLimit, iNonRedrawAgeLimit))
+		iNonRedrawAgeLimit = KDefaultNonRedrawAgeLimit;
+	
+	_LIT(KAtomicRedraws,"ATOMICREDRAWS");
+	_LIT(KAtomicSegment,"SEGMENT");
+	_LIT(KAtomicWindow,"WINDOW");
+
+	TPtrC atomicityTypeString;
+	if (WsIniFile->FindVar(KAtomicRedraws,atomicityTypeString))
+		{
+		if(atomicityTypeString.CompareF(KAtomicSegment)==0 || atomicityTypeString.Length()==0)
+			iAtomicity = ESegment;
+		else if(atomicityTypeString.CompareF(KAtomicWindow)==0)
+			iAtomicity = EWindow;
+		}
+	}
+
+void CWsRedrawMsgWindow::CRedrawSegment::ReleaseFontsAndBitmaps()
+	{
+	// release Bitmap and Font handles
+	TInt count = iWsBitmapArray.Count();
+	TInt ii;
+	for (ii = count - 1; ii >= 0; ii--)
+		{
+		iWsBitmapArray[ii]->DecRefCount();
+		iWsBitmapArray.Remove(ii);
+		}
+
+	count = iWsFontArray.Count();
+	for (ii = count - 1; ii >= 0; --ii)
+		{
+		CWsFontCache::Instance()->ReleaseFont(iWsFontArray[ii]);
+		iWsFontArray.Remove(ii);
+		}
+
+	count = iFbsBitmapArray.Count();
+	for(ii = count - 1 ; ii >= 0; ii--)
+		{
+		delete iFbsBitmapArray[ii];
+		iFbsBitmapArray.Remove(ii);
+		}
+	}
+
+/* Set new rectangle and region type for initial or reset redraw region
+ @leave KErrNoMemory no memory to update region details
+ */
+void CWsRedrawMsgWindow::CRedrawSegment::ConstructL(const TRect& aRect, TRedrawSegmentType aNewRegionType)
+	{
+	iDrawCommands = CBufSeg::NewL(KDrawBufferGranularity);
+	iCreationTime.UniversalTime();
+
+	iRegion.AddRect(aRect);
+	if (iRegion.CheckError())
+		{
+		User::Leave(KErrNoMemory);
+		}
+	iRedrawSegmentType = aNewRegionType;
+	}
+
+CWsRedrawMsgWindow::CRedrawSegment::~CRedrawSegment()
+	{
+	delete iDrawCommands;
+
+	iRegion.Close();
+
+	// Release Font and Bitmap handles, close arrays
+	ReleaseFontsAndBitmaps();
+	iFbsBitmapArray.Close();
+	iWsBitmapArray.Close();
+	iWsFontArray.Close();
+	iDrawerArray.Close();
+	}
+
+void CWsRedrawMsgWindow::WindowClosing()
+	{
+	iWsWin->WsOwner()->RedrawQueue()->RemoveInvalid(this);
+	}
+
+
+TInt CWsRedrawMsgWindow::CRedrawSegment::SizeInBytes() const
+	{
+	TInt size = sizeof(CWsRedrawMsgWindow::CRedrawSegment);
+	size += iDrawCommands->Size();
+	size += iFbsBitmapArray.Count() * sizeof(CFbsBitmap);
+	size += iWsBitmapArray.Count() * sizeof(DWsBitmap);
+	size += iWsFontArray.Count() * sizeof(CWsFbsFont);
+	size += iDrawerArray.Count() * sizeof(TGraphicDrawerId);
+	return size;
+	}
+
+CWsRedrawMsgWindow::CWsRedrawMsgWindow(CWsWindow *aWin)
+	:CWsWindowRedraw(aWin), iBackColor(aWin->RootWindow()->DefaultBackgroundColor()), iFlags(EBackgroundClear|EStoringEntireWindow),
+	iRedrawSegments(KRedrawRegionGranularity),
+	iCurrentSegment(0),
+	iOSBStatus(ETrue)
+	{
+	}
+
+void CWsRedrawMsgWindow::ConstructL()
+	{
+	CWsWindowRedraw::ConstructL();
+	Invalidate(&WsWin()->Rel());
+	iWsWin->WsOwner()->RedrawQueue()->ReCalcOrder();
+	}
+	
+CWsRedrawMsgWindow::~CWsRedrawMsgWindow()
+	{
+	WS_ASSERT_DEBUG(iMemoryLock == 0, EWsPanicMemoryLock);
+	RemoveFromRedrawQueueIfEmpty();
+	iInvalid.Close();
+	iLocalRedrawRegion.Close();
+	iRedrawSegments.ResetAndDestroy();
+	iCurrentSegment=NULL;
+	}
+
+/**
+These three functions actually check for a value they have already asserted on.  This is intentional.
+*/
+void CWsRedrawMsgWindow::ExpandCommandBufferL(TInt aLength)
+	{
+	WS_ASSERT_DEBUG(iCurrentSegment != NULL, EWsPanicRedrawSegmentsInvalidState);
+	
+	if (iCurrentSegment)
+		{
+		// need more space?
+		if (iCurrentSegment->iCurrentCommandBufferWritePos + aLength > iCurrentSegment->iDrawCommands->Size())
+			{
+			iCurrentSegment->iDrawCommands->ResizeL(iCurrentSegment->iCurrentCommandBufferWritePos + aLength);
+			}
+		}
+	}
+
+void CWsRedrawMsgWindow::CommandBufferWrite(const TDesC8& aDes, TInt aLength)
+	{
+	WS_ASSERT_DEBUG(iCurrentSegment != NULL, EWsPanicRedrawSegmentsInvalidState);
+	WS_ASSERT_DEBUG(iCurrentSegment->iCurrentCommandBufferWritePos + aLength <= iCurrentSegment->iDrawCommands->Size(), EWsPanicDrawCommandsInvalidState);
+	if (iCurrentSegment)
+		{
+		iCurrentSegment->iDrawCommands->Write(iCurrentSegment->iCurrentCommandBufferWritePos, aDes, aLength);
+		iCurrentSegment->iCurrentCommandBufferWritePos += aLength;
+		}
+	}
+
+void CWsRedrawMsgWindow::CommandBufferWrite(const TAny* aPtr,TInt aLength)
+	{
+	WS_ASSERT_DEBUG(iCurrentSegment != NULL, EWsPanicRedrawSegmentsInvalidState);
+	WS_ASSERT_DEBUG(iCurrentSegment->iCurrentCommandBufferWritePos + aLength <= iCurrentSegment->iDrawCommands->Size(), EWsPanicDrawCommandsInvalidState);
+	if (iCurrentSegment)
+		{
+		iCurrentSegment->iDrawCommands->Write(iCurrentSegment->iCurrentCommandBufferWritePos, aPtr, aLength);
+		iCurrentSegment->iCurrentCommandBufferWritePos += aLength;
+		}
+	}
+
+/*------------------------------------------------------------------------------
+  Description: Processes draw commands. These are received as opcodes.
+ -----------------------------------------------------------------------------*/
+TBool CWsRedrawMsgWindow::CommandL(TInt aOpcode, TWsWinCmdUnion &aCmd)
+	{
+	switch(aOpcode)
+		{
+		case EWsWinOpEnableOSB:
+			iOSBStatus = ETrue;
+			break;
+		case EWsWinOpDisableOSB:
+			iOSBStatus = EFalse;
+			break;
+		case EWsWinOpSetBackgroundColor:
+			iBackColor = *aCmd.rgb;
+			iFlags |= EBackgroundClear;
+			break;
+		case EWsWinOpSetNoBackgroundColor:
+			iFlags &= ~EBackgroundClear;
+			break;
+		case EWsWinOpInvalidate:
+			Invalidate(aCmd.rect);
+			break;
+		case EWsWinOpInvalidateFull:
+			Invalidate();
+			break;
+		case EWsWinOpBeginRedraw:
+			BeginRedraw(aCmd.rect);
+			ValidateRect(aCmd.rect);
+			break;
+		case EWsWinOpBeginRedrawFull:
+			BeginRedraw(NULL);
+			ValidateRect(NULL);
+			break;
+		case EWsWinOpEndRedraw:
+			EndRedraw();
+			break;
+		case EWsWinOpGetInvalidRegionCount:
+			{				
+			SetReply(iInvalid.Count());
+			}
+			break;
+		case EWsWinOpGetInvalidRegion:
+			{
+			if ((*aCmd.Int) <= 0)
+				OwnerPanic(EWservPanicInvalidRegionCount);
+			if ((!iInvalid.CheckError()) && iInvalid.Count() == (*aCmd.Int))
+				{
+				CWsClient::ReplyBuf(iInvalid.RectangleList(),(*aCmd.Int) * sizeof(TRect));
+				SetReply(EFalse);				
+				}
+			else
+				SetReply(ETrue);
+			}
+			break;
+		case EWsWinOpStoreDrawCommands:
+			/* If the client asks us not to store commands, we still store the commands
+			for the region of the window which can be seen through the parent, but
+			won't attempt to obtain the entire window.
+			*/
+			if (*aCmd.Bool)
+				{
+				SetScope(EStoreEntireWindow);
+				}
+			else
+				{
+				// Clients that turn their redraw store off will still get one,
+				// but it will only attempt to store the current viewport.
+				SetScope(EStoreViewport);
+				}
+			break;
+		case EWsWinOpHandleTransparencyUpdate:  // deprecated
+		case EWsWinOpSetTransparencyBitmap:	    // deprecated
+		case EWsWinOpSetTransparencyFactor:		// deprecated
+		case EWsWinOpSetTransparencyBitmapCWs:  // deprecated
+			break;    // do nothing.
+		case EWsWinOpIsRedrawStoreEnabled:
+			SetReply(ETrue);
+			break;
+		case EWsWinOpClearRedrawStore:
+			DiscardStoredCommands();
+			break;
+		default:
+			return(EFalse);
+		}
+	return(ETrue);
+	}
+
+/**
+*/
+void CWsRedrawMsgWindow::BeginRedraw(const TRect* aRect)
+	{
+	if(InRedraw())
+		OwnerPanic(EWservPanicDrawCommandsInvalidState);
+	iFlags|=EBeginEndRedraw;
+	TRAPD(err,DoBeginRedrawL(aRect));
+	DiscardStoredCommandsIfError(err);
+	}
+
+void CWsRedrawMsgWindow::DoBeginRedrawL(const TRect* aRect)
+	{
+	const TRect redrawRect = (aRect ? *aRect : TRect(WsWin()->Size()));
+	if (redrawRect.IsEmpty())
+		{
+		//Skip empty rects since they are not added to the region
+		iCurrentSegment = NULL;
+		}
+	else
+		{
+		CreateNewSegmentL(redrawRect, CWsRedrawMsgWindow::ESegmentTypePendingRedraw);
+		if (iAtomicity==ENoAtomicity)
+			PromoteLastPendingSegment();
+		}
+	}
+
+void CWsRedrawMsgWindow::Invalidate(const TRect * aRect)
+	{
+    //The memory allocation in this function can trigger a call to ReleaseMemory(), which would
+    //recursively call this function again. This would cause a memory leak. To avoid this
+    //we call Lock() to block ReleaseMemory() from this object while executing this function.
+    Lock();
+	if (!aRect)
+		{
+		iInvalid.Clear();
+		iInvalid.Copy(iWsWin->WindowArea());
+		iInvalid.Offset(-iWsWin->Origin());
+		}
+	else if((!aRect->IsEmpty()) && aRect->IsNormalized())
+		{
+		iInvalid.AddRect(*aRect);
+		iInvalid.Tidy();		
+		}
+	if (iWsWin->IsVisible())
+		{
+		QueueRedraw();
+		iWsWin->WsOwner()->TriggerRedraw(); //wtf isn't the redrawq already scheduling itself?
+		}
+	Unlock();
+	}
+
+/**
+If a draw command is received outside a begin/end redraw pair, then it is stored in a non-redraw
+segment.  This function creates such a segment if it isn't already available.
+*/
+void CWsRedrawMsgWindow::HandleNonRedrawCommand(TWsGcOpcodes aOpcode)
+	{
+	// calling code should check the Window State
+	WS_ASSERT_DEBUG(!InRedraw(), EWsPanicDrawCommandsInvalidState);
+	
+	// Attempting to draw part of a polygon in a new segment - only a very bad client can do this:
+	TBool canCreate = !(aOpcode == EWsGcOpSegmentedDrawPolygonData || aOpcode == EWsGcOpDrawSegmentedPolygon);
+	if ((!iCurrentSegment) && (!canCreate))
+		{
+		OwnerPanic(EWservPanicBadPolyData);
+		}
+
+	if (canCreate)
+		AgeNonRedrawSegments();
+	
+	// If current redraw region is not for Non-Redraw drawing, add a region corresponding to the
+	// full window to the redraw store.  Need to make sure that this is done 
+	// before the AppendCommand, or bitmap/font handles are recorded, in StoreDrawCommandL
+	TInt err = KErrNone;
+	if ((!iCurrentSegment) || iCurrentSegment->iRedrawSegmentType != ESegmentTypeNonRedraw)
+		{
+		TRAP(err,CreateNewSegmentL(TRect(WsWin()->Size()), ESegmentTypeNonRedraw));
+		}
+
+	if (err != KErrNone)
+		{
+		Invalidate();
+		}
+
+	if(iWsWin->VisibleRegion().CheckError())
+		iWsWin->Screen()->AddRedrawRegion(iWsWin->WindowArea());
+	else if(iWsWin->VisibleRegion().Count())
+		iWsWin->Screen()->AddRedrawRegion(iWsWin->VisibleRegion());
+	else if(!iWsWin->HasBeenDrawnToScreen())
+		CliWin()->ScheduleRegionUpdate(&iWsWin->VisibleRegion());
+	}
+
+/**
+This function attempts to prevent non-redraw segments from growing indefinitely by requesting redraws 
+and throwing away old ones.
+*/
+void CWsRedrawMsgWindow::AgeNonRedrawSegments()
+  	{
+	if (!iRedrawSegments.Count())
+		return;
+	
+	//Count the number of non-redraw segs
+	TInt nonRedrawSegCount = 0;
+	for (TInt i = iRedrawSegments.Count()-1; i >= 0; --i)
+		{
+		CRedrawSegment* segment = iRedrawSegments[i];
+		if (segment->iRedrawSegmentType == ESegmentTypeNonRedraw)
+			{
+			++nonRedrawSegCount; 
+			}
+		}
+	
+	TBool callInvalidate = EFalse;
+	
+	//To prevent the number of non redraw segements to grow indefinitely,
+	//delete the oldest if their number exceeds KNonRedrawSegMaxLimit
+	if (nonRedrawSegCount > KNonRedrawSegMaxLimit)
+		{
+		TInt keep = KNonRedrawSegThreshold; // keep this many, the most recent ones
+		for (TInt i = iRedrawSegments.Count()-1; i >= 0; --i)
+			{
+			CRedrawSegment* segment = iRedrawSegments[i];
+			if (segment->iRedrawSegmentType == ESegmentTypeNonRedraw)
+				{
+				if (keep-- > 0)
+					{
+					continue;
+					}
+				else if (segment!=iCurrentSegment) //never delete the current segment
+					{
+					callInvalidate = ETrue;
+					iRedrawSegments.Remove(i);
+					delete segment;
+					}
+				}
+			}
+		}
+
+	if(iCurrentSegment && iCurrentSegment->iRedrawSegmentType == ESegmentTypeNonRedraw)
+		{
+		// If the current segment is an old non-redraw segment, try to get rid of it
+		TTime now;
+		now.UniversalTime();
+		TTimeIntervalMicroSeconds age = now.MicroSecondsFrom(iCurrentSegment->iCreationTime);
+		if (age > iNonRedrawAgeLimit)
+			{
+			// First, find any even older non redraw segments and discard them.
+			for (TInt seg = iRedrawSegments.Count() - 2; seg >= 0; --seg)
+				{
+				CRedrawSegment * segment = iRedrawSegments[seg];
+				if (segment->iRedrawSegmentType == ESegmentTypeNonRedraw)
+					{
+					age = now.MicroSecondsFrom(segment->iCreationTime);
+					if ((age > iNonRedrawAgeLimit * 2) && (segment!=iCurrentSegment))
+						{
+						iRedrawSegments.Remove(seg);
+						delete segment;
+						}
+					}
+				}
+			
+			// Then force the creation of a new segment, so that the current one can be allowed to age and eventually vanish.
+			iCurrentSegment->iCreationTime = now;
+			iCurrentSegment = NULL;
+			callInvalidate = ETrue;
+			}
+		}
+	
+	if(callInvalidate)
+		Invalidate(); // Invalidate the window so that a complete redraw should occur
+  	}
+
+/**
+Obtains a region from the redraw store, intersects it with the global redraw region which
+we have been asked to draw to, and returns the intersection.
+*/
+const TRegion * CWsRedrawMsgWindow::ReadRegion(const TInt aRegionNum)
+	{
+	// Catch anyone calling this without first deciding where they want to draw
+	WS_ASSERT_DEBUG(iWsWin->ScheduledRegion(), EWsPanicScheduledRedraw);
+
+	// We are drawing to the global region, and we have a region in the redraw store to clip to.
+	// We want the intersection of these to actually draw to.
+	// Andy - this allocates memory during drawing, which is bad in OOM conditions.
+	iLocalRedrawRegion.Copy(iRedrawSegments[aRegionNum]->iRegion);
+	iLocalRedrawRegion.Offset(WsWin()->Origin());
+	iLocalRedrawRegion.Intersect(*iGlobalRedrawRegion);
+	iLocalRedrawRegion.Tidy();
+
+	// If the resulting region is empty there is no point drawing its corresponding commands
+	if (iLocalRedrawRegion.IsEmpty())
+		return NULL;
+	else
+		return &iLocalRedrawRegion;
+	}
+
+TInt CWsRedrawMsgWindow::SubtractRectFromSegmentArray(const TRect& aRect)
+	{
+	TInt numOfRegionsRemoved =0;
+	for (TInt regionNum = iRedrawSegments.Count() - 1; regionNum >= 0; --regionNum)
+		{
+		if (iRedrawSegments[regionNum]->iRedrawSegmentType != ESegmentTypePendingRedraw)
+			{
+			RWsRegion& region = iRedrawSegments[regionNum]->iRegion;
+			region.SubRect(aRect);
+			if (region.CheckError())
+				{
+				// Ouch. Drop the now broken segment and ask for a full redraw
+				// Andy - This is an error condition and needs to check for infinite loops
+				delete iRedrawSegments[regionNum];
+				iRedrawSegments.Remove(regionNum);
+				numOfRegionsRemoved++;
+				Invalidate();
+				}
+			else
+				{
+				// check if region has zero uncovered rectangles left
+				if (region.IsEmpty())
+					{ // delete draw commands, release bitmaps and fonts
+					delete iRedrawSegments[regionNum];
+					iRedrawSegments.Remove(regionNum);
+					numOfRegionsRemoved++;
+					}
+				else
+					{
+					if (region.Count() > KRegionCompressThreshold)
+						{ // tidy up the rectangles
+						region.Tidy();
+						}
+					}
+				}
+			}
+		}
+	return numOfRegionsRemoved;
+	}
+
+/*------------------------------------------------------------------------------
+  Description: Clears out the command buffer if aError indicates an
+               error has occurred whilst storing commands.
+ -----------------------------------------------------------------------------*/
+void CWsRedrawMsgWindow::DiscardStoredCommandsIfError(TInt aError)
+	{
+	if (aError != KErrNone)
+		{
+		// Discard stored commands by clearing out the command buffer
+		DiscardStoredCommands();
+
+		if (!(iFlags&ENoRepeatRedraw))
+			Invalidate();
+		iFlags |= ENoRepeatRedraw;
+		}
+	}
+
+/*------------------------------------------------------------------------------
+  Description: If the graphics context has changed and we are currently storing
+               commands, store the data given by aCmdData.
+               
+ -----------------------------------------------------------------------------*/
+TBool CWsRedrawMsgWindow::DrawCommand(CWsGc* aGc,const TAny *aCmdData)
+	{
+	// Store commands, clearing out buffer if error occurs.
+	TRAPD(err,StoreDrawCommandL(aGc,aCmdData));
+	DiscardStoredCommandsIfError(err);
+	return EFalse;
+	}
+
+void CWsRedrawMsgWindow::GcAttributeChange(CWsGc* aGc,const TAny *aCmdData)
+	{
+	if (iLastDrawGc == aGc && iCurrentSegment)
+		{
+		TInt err = KErrNone;
+		if (IsWsFontOperation(CWsClient::iCurrentCommand.iOpcode))
+			{
+			TWsGcCmdUnion pData;
+			pData.any=aCmdData;
+			TRAP(err,AddWsFontL(*pData.UInt));
+			}
+		if (KErrNone == err)
+			TRAP(err,AppendCommandL(aCmdData));
+		DiscardStoredCommandsIfError(err);
+		}
+	
+	// INC135845: 
+	// Retain the bitmap handle for the lifetime of the redraw store
+	// If the client destroys it, we will still have a reference to it
+	if (iCurrentSegment && CWsClient::iCurrentCommand.iOpcode == EWsGcOpUseBrushPattern)
+		{
+		TInt err = KErrNone;
+		TWsGcCmdUnion pData;
+		pData.any=aCmdData;
+		TRAP(err, AddFbsBitmapsL(*pData.handle, 0));
+		DiscardStoredCommandsIfError(err);
+		}
+	}
+
+void CWsRedrawMsgWindow::GcDeactivate(CWsGc* aGc)
+	{
+	if (iLastDrawGc==aGc)
+		iLastDrawGc=NULL;
+	}
+
+inline TBool CWsRedrawMsgWindow::IsFbsBitmapOperation(TInt aOpCode) const
+	{
+	WS_ASSERT_DEBUG((EWsGcOpGdiBlt3==EWsGcOpGdiBlt2+1)&&(EWsGcOpGdiBltMasked==EWsGcOpGdiBlt3+1)
+				&&(EWsGcOpDrawBitmap2==EWsGcOpDrawBitmap+1)&&(EWsGcOpDrawBitmap3==EWsGcOpDrawBitmap2+1)&&(EWsGcOpDrawBitmapMasked==EWsGcOpDrawBitmap3+1),EWsPanicBitmapOpcodeInvalid);
+	return (aOpCode>=EWsGcOpGdiBlt2&&aOpCode<=EWsGcOpGdiBltMasked)||(aOpCode>=EWsGcOpDrawBitmap&&aOpCode<=EWsGcOpDrawBitmapMasked)||(aOpCode==EWsGcOpGdiAlphaBlendBitmaps);
+	}
+
+inline TBool CWsRedrawMsgWindow::IsWsBitmapOperation(TInt aOpCode) const
+	{
+	WS_ASSERT_DEBUG((EWsGcOpGdiBlt3==EWsGcOpGdiBlt2+1)&&(EWsGcOpGdiBltMasked==EWsGcOpGdiBlt3+1)
+				&&(EWsGcOpDrawBitmap2==EWsGcOpDrawBitmap+1)&&(EWsGcOpDrawBitmap3==EWsGcOpDrawBitmap2+1)&&(EWsGcOpDrawBitmapMasked==EWsGcOpDrawBitmap3+1),EWsPanicBitmapOpcodeInvalid);
+	return (aOpCode>=EWsGcOpGdiWsBlt2&&aOpCode<=EWsGcOpGdiWsBltMasked)||(aOpCode==EWsGcOpGdiWsAlphaBlendBitmaps)||(aOpCode==EWsGcOpWsDrawBitmapMasked);
+	}
+
+inline TBool CWsRedrawMsgWindow::IsWsFontOperation(TInt aOpCode) const
+	{
+	return aOpCode==EWsGcOpUseFont;
+	}
+
+inline TBool CWsRedrawMsgWindow::IsDrawWsGraphicOperation(TInt aOpCode) const
+	{
+	return (aOpCode == EWsGcOpDrawWsGraphic) || (aOpCode == EWsGcOpDrawWsGraphicPtr);
+	}
+
+void CWsRedrawMsgWindow::ReplaceAndAppendCommandL(TInt aOpcode,const TAny* aCmdData)
+	{
+	const TInt KCharWidthInBytes = 2; // # of bytes for a Unicode character
+	CWsClient* owner=iWsWin->WsOwner();
+	WS_ASSERT_DEBUG(owner,EWsPanicDrawCommandsNullSession);
+
+	// aCmdData doesn't contain data, it should be retrieved from client space using remote read
+	TWsGcCmdUnion cmd;
+	cmd.any=aCmdData;
+	TUint16 newOpcode=EWsGcOpDrawText;
+	TInt strLen=0;
+	switch (aOpcode)
+		{
+		case EWsGcOpDrawTextPtr:
+			newOpcode=EWsGcOpDrawText;
+			strLen=cmd.DrawText->length;
+			break;
+		case EWsGcOpDrawTextVerticalPtr:
+			newOpcode=EWsGcOpDrawTextVertical;
+			strLen=cmd.DrawTextVertical->length;
+			break;
+		case EWsGcOpDrawBoxTextPtr:
+			newOpcode=EWsGcOpDrawBoxText;
+			strLen=cmd.BoxText->length;
+			break;
+		case EWsGcOpDrawBoxTextVerticalPtr:
+			newOpcode=EWsGcOpDrawBoxTextVertical;
+			strLen=cmd.DrawBoxTextVertical->length;
+ 			break;
+		}
+	TInt strSize = strLen * KCharWidthInBytes;
+	TInt oldCmdLen=CWsClient::iCurrentCommand.iCmdLength;
+	TInt newCmdLen=sizeof(TWsCmdHeaderBase)+oldCmdLen+strSize;
+	// resize buffer
+	ExpandCommandBufferL(newCmdLen);
+	// update current command to reflect the new command and data
+	CWsClient::iCurrentCommand.iOpcode=newOpcode;
+	CWsClient::iCurrentCommand.iOpcode|=EWsGcOpFlagDrawOp;
+	CWsClient::iCurrentCommand.iCmdLength=(TInt16)(oldCmdLen+strSize);
+	// write command header
+	CommandBufferWrite(&CWsClient::iCurrentCommand, sizeof(TWsCmdHeaderBase));
+	// write command
+	CommandBufferWrite(aCmdData, oldCmdLen);
+
+	// remote read
+	TBuf<KReadBufferMaxLen> buf;
+	TInt len=KReadBufferMaxLen;
+	TInt bufOffset=0;
+	TInt toGo=strLen;
+	while(toGo>0)
+		{
+		if (len>toGo)
+			len=toGo;
+		owner->RemoteRead(buf,bufOffset);
+		CommandBufferWrite(buf.Ptr(), len * KCharWidthInBytes);
+		bufOffset+=len;
+		toGo-=len;
+		}
+	}
+
+/*------------------------------------------------------------------------------
+  Description: Stores drawing related commands into the command buffer
+ -----------------------------------------------------------------------------*/
+void CWsRedrawMsgWindow::StoreDrawCommandL(CWsGc* aGc,const TAny *aCmdData)
+	{
+	TWsGcOpcodes currentOpcode = static_cast<TWsGcOpcodes>(CWsClient::iCurrentCommand.iOpcode);
+
+	// If we get an extra command after the redraw has finished then redraw strategy needs to know
+	if (!InRedraw())
+		{
+#ifdef __WINS__
+		TBool isDrawingCommand = (currentOpcode != EWsGcOpSegmentedDrawPolygonData) && (currentOpcode != EWsGcOpDrawSegmentedPolygon);
+
+		if( CWsClient::DebugEnforceRedrawCallingConvention() && isDrawingCommand)
+			CWsClient::PanicCurrentClient(EWservPanicWindowBeginRedrawNotCalled);
+#endif
+		HandleNonRedrawCommand(currentOpcode);
+		}
+
+	// If there is no current segment then we have discarded it at some point
+	// since beginning this redraw.  
+	if (iCurrentSegment)
+		{
+		TWsGcCmdUnion pData;
+		pData.any = aCmdData;
+		if (IsFbsBitmapOperation(currentOpcode))
+			{
+			TInt maskHandle = 0;
+			TInt handle = aGc->FbsBitmapHandle(currentOpcode, pData, maskHandle);
+			AddFbsBitmapsL(handle, maskHandle);
+			}
+		else if (IsWsBitmapOperation(currentOpcode))
+			{
+			TInt maskHandle = 0;
+			TInt handle = aGc->WsBitmapHandle(currentOpcode, pData, maskHandle);
+			AddWsBitmapsL(handle, maskHandle);
+			}
+		else if (IsDrawWsGraphicOperation(currentOpcode))
+			{
+			TGraphicDrawerId drawerId;
+			drawerId.iId = pData.WsGraphic->iId;
+			drawerId.iIsUid = (pData.WsGraphic->iFlags & EWsGraphicIdUid);
+			iCurrentSegment->AddDrawerL(drawerId);
+			}
+
+		// If the graphics context has changed since last time store the new graphics
+		// context attributes.
+		if (aGc != iLastDrawGc)
+			{
+			StoreAllGcAttributesL(aGc);
+			iLastDrawGc = aGc;
+			}
+
+		// For operation which requires remote read from client space, we must retrieve that data and store
+		// it in command buffer at server side and change opcode if necessary e.g EWsGcOpDrawTextPtr to EWsGcOpDrawText
+		// to avoid remote read during DoDrawing operation
+		if (IsRemoteReadRequired(currentOpcode))
+			ReplaceAndAppendCommandL(currentOpcode,aCmdData);
+		else
+			// Append the command data to the command buffer
+			AppendCommandL(aCmdData, EWsGcOpFlagDrawOp);
+		}
+	}
+
+/*------------------------------------------------------------------------------
+  Description: Stores given drawing command data into the command buffer.
+ -----------------------------------------------------------------------------*/
+void CWsRedrawMsgWindow::AppendCommandL(const TAny* aCmdData, const TUint16 aOpcodeFlags)
+	{
+	if (CWsClient::iCurrentCommand.iOpcode == EWsGcOpSetClippingRegion)
+		{
+		// The client is defining a clipping region
+
+		// make room for the header
+		ExpandCommandBufferL(sizeof(TWsCmdHeaderBase));
+
+		// Externalize the clipping region data from position after the header
+		RBufWriteStream bufWriteStream;
+		bufWriteStream.Open(*CurrentDrawCommandBuffer(), CurrentCommandBufferWritePos() + sizeof(TWsCmdHeaderBase));
+		CleanupClosePushL(bufWriteStream);
+		TInt dataLen = iLastDrawGc->ExternalizeClippingRegionL(bufWriteStream);
+
+		// Setup the clipping region data header
+		CWsClient::iCurrentCommand.iOpcode = EWsStoreClippingRegion;
+		CWsClient::iCurrentCommand.iCmdLength = REINTERPRET_CAST(TInt16&,dataLen);
+
+		// Store command header for clipping region data at current write position
+		CommandBufferWrite(&CWsClient::iCurrentCommand,sizeof(TWsCmdHeaderBase));
+
+		// Update write position for command data
+		iCurrentSegment->iCurrentCommandBufferWritePos += dataLen;
+		
+		CleanupStack::PopAndDestroy(&bufWriteStream);
+		}
+	else
+		{		
+		TUint16 opcode = CWsClient::iCurrentCommand.iOpcode;
+		CWsClient::iCurrentCommand.iOpcode |= aOpcodeFlags;
+
+		// ensure room in command buffer
+		ExpandCommandBufferL(sizeof(TWsCmdHeaderBase) + CWsClient::iCurrentCommand.iCmdLength);
+
+		// Store command header to current position
+		CommandBufferWrite(&CWsClient::iCurrentCommand, sizeof(TWsCmdHeaderBase));
+
+		// If there's command data (other than header), store it
+		if (CWsClient::iCurrentCommand.iCmdLength > 0)
+			{
+			CommandBufferWrite(aCmdData, CWsClient::iCurrentCommand.iCmdLength);
+			}
+
+		CWsClient::iCurrentCommand.iOpcode = opcode;
+		}
+	}
+
+
+/*------------------------------------------------------------------------------
+  Description: Stores graphics context information into the command buffer
+               from the current write position.
+ -----------------------------------------------------------------------------*/
+void CWsRedrawMsgWindow::StoreAllGcAttributesL(CWsGc* aGc)
+	{
+	// In order for the externalize below to work correctly from
+	// a non-zero position we have to create the header placeholder
+	ExpandCommandBufferL(sizeof(TWsCmdHeaderBase));
+
+	// Externalise GC attribute data. We do this before writing the
+	// header as we do not know the size of the data yet and it is
+	// part of the header.
+	TInt numOfBytesAdded = aGc->ExternalizeL(*CurrentDrawCommandBuffer(),
+				CurrentCommandBufferWritePos() + sizeof(TWsCmdHeaderBase));
+
+	// Setup the header
+	TWsCmdHeaderBase cmdHeader;
+	cmdHeader.iCmdLength = (TInt16) numOfBytesAdded;		// as calculated above
+	cmdHeader.iOpcode = (TInt16) EWsStoreAllGcAttributes;
+
+	// Store the header for the GC data into the space we created
+	CommandBufferWrite(&cmdHeader, sizeof(TWsCmdHeaderBase));
+
+	// Update write position for command data
+	iCurrentSegment->iCurrentCommandBufferWritePos += numOfBytesAdded;
+	}
+
+/*------------------------------------------------------------------------------
+  Description: Loops through the whole of the current command buffer, processing
+               each in turn.
+ -----------------------------------------------------------------------------*/
+void CWsRedrawMsgWindow::DrawCommandsL()
+	{
+	LOG_WINDOW_REDRAW_START(WsWin(), iGlobalRedrawRegion);
+	WS_ASSERT_DEBUG(iMemoryLock > 0, EWsPanicMemoryLock);
+	static TBuf8<EClientBufferMaxSize> buf;
+	TInt regionCount = iRedrawSegments.Count();
+	
+	for (TInt regionNum = 0; regionNum < regionCount; ++regionNum)
+		{
+		CRedrawSegment* segment = iRedrawSegments[regionNum];
+		LOG_REDRAW_SEGMENT(regionNum, segment->iRedrawSegmentType);
+		if (segment->iRedrawSegmentType == ESegmentTypePendingRedraw)
+			continue;
+		
+		// The amount of commands we process is given by the value of the
+		// current write position rather than the size of the command buffer.
+		// Note: the write position is incremented as each command is stored and
+		// will typically be less than the buffer size.
+		const TInt length = segment->iCurrentCommandBufferWritePos;
+
+		// need to draw this region?
+		const TRegion * localDrawRegion = 0;
+		if (length)
+		 	localDrawRegion = ReadRegion(regionNum);
+		if (localDrawRegion)
+			{
+			CPlaybackGc::Instance()->SetTargetRegion(localDrawRegion);
+			LOG_REDRAW_SEGMENT_REGION(localDrawRegion)
+			
+			TWsCmdHeaderBase header;
+			TInt pos = 0; // Set to first command position in buffer
+			CBufSeg* drawCmdBuffer = segment->iDrawCommands;
+
+#ifdef _DEBUG
+			// Read the first command header. The associated opcode must always be
+			// EWsStoreAllGcAttributes as this is always the first stored item.
+			drawCmdBuffer->Read(pos,&header,sizeof(TWsCmdHeaderBase));
+			WS_ASSERT_DEBUG(header.iOpcode == EWsStoreAllGcAttributes, EWsPanicDrawCommandsBufferCorrupt);
+#endif
+
+			// Read through remaining commands
+			while (pos < length)
+				{
+				// Get header of command
+				drawCmdBuffer->Read(pos, &header, sizeof(TWsCmdHeaderBase));
+				pos += sizeof(TWsCmdHeaderBase);
+
+				switch(header.iOpcode)
+					{
+					case EWsStoreAllGcAttributes:
+						{
+						// Header indicates command encapsulates gc data
+						CPlaybackGc::Instance()->Reset();
+
+						// Read gc data
+						CPlaybackGc::Instance()->InternalizeL(*drawCmdBuffer,pos);
+
+						}
+						break;
+					case EWsStoreClippingRegion:
+						{
+						// Clipping region data read in from current position via stream
+						RBufReadStream bufReadStream;
+						bufReadStream.Open(*drawCmdBuffer,pos);
+						CleanupClosePushL(bufReadStream);
+						CPlaybackGc::Instance()->InternalizeClippingRegionL(bufReadStream);
+						CleanupStack::PopAndDestroy(&bufReadStream);
+						}
+						break;
+					default:
+						{
+						// Another type of command. Read it.
+						CWsClient::iCurrentCommand.iCmdLength = header.iCmdLength;
+						drawCmdBuffer->Read(pos,buf,header.iCmdLength);
+
+						TInt opcode = header.iOpcode;
+
+						// Drawing command?
+						if (opcode & EWsGcOpFlagDrawOp)
+							{
+							opcode &= ~EWsGcOpFlagDrawOp;
+							}
+						if (opcode > -1)
+							{
+							LOG_PLAYBACK_GC_COMMAND(opcode, buf.Ptr())
+							CPlaybackGc::Instance()->CommandL(static_cast<TWsGcOpcodes>(opcode),buf);
+							}
+						}
+						break;
+					}
+				pos += header.iCmdLength; // Move on, header indicates length
+				}
+			DEBUGOSB // per-redraw-segment debug osb updates
+			}
+		}
+	LOG_WINDOW_REDRAW_END(WsWin());
+	}
+
+/*------------------------------------------------------------------------------
+  Description: Called when the currently stored graphics commands
+               are no longer required.
+ -----------------------------------------------------------------------------*/
+void CWsRedrawMsgWindow::DiscardStoredCommands()
+	{
+	iCurrentSegment = NULL;
+	if (iRedrawSegments.Count() > 0)
+		{
+		// First of all, if we have any redraws pending, update the screen with
+		// whatever commands we have before we throw them away:
+		if (iFlags & EPendingScheduledDraw)
+			{
+			Screen()->DoRedrawNow();
+			}
+	
+		// for all regions or just Partial Redraw regions > index 0: delete bitmaps and draw commands
+		iRedrawSegments.ResetAndDestroy();
+
+		iLastDrawGc = NULL;
+		}
+	}
+
+void CWsRedrawMsgWindow::CreateNewSegmentL(const TRect& aRect, TRedrawSegmentType aNewRedrawRegionType)
+	{
+	CWsRedrawMsgWindow::CRedrawSegment* newRegion = CWsRedrawMsgWindow::CRedrawSegment::NewLC(aRect, aNewRedrawRegionType);
+
+	iRedrawSegments.AppendL(newRegion);
+	iCurrentSegment = newRegion;
+	CleanupStack::Pop(newRegion);
+
+	// Set iLastDrawGc to NULL. This will cause all GC attributes to be stored
+	// in redraw store when the window receives the next command
+	iLastDrawGc = NULL;
+	}
+
+static TInt FindBitmapByHandle(const TInt* aKey, const CFbsBitmap& aBitmap)
+	{ // compare handles
+	return *aKey - aBitmap.Handle();
+	}
+
+static TInt InsertBitmapByHandle(const CFbsBitmap& aFirst, const CFbsBitmap& aSecond)
+	{
+	return aFirst.Handle() - aSecond.Handle();
+	}
+
+void CWsRedrawMsgWindow::AddFbsBitmapsL(TInt aHandle, TInt aMaskHandle)
+	{
+	iCurrentSegment->AddFbsBitmapL(aHandle, this);
+	if (aMaskHandle)
+		{
+		iCurrentSegment->AddFbsBitmapL(aMaskHandle, this);
+		}
+	}
+
+void CWsRedrawMsgWindow::CRedrawSegment::AddFbsBitmapL(TInt aHandle, CWsRedrawMsgWindow* aWindow)
+	{
+	if (iFbsBitmapArray.FindInOrder(aHandle, &FindBitmapByHandle) >= 0)
+		{
+		// Bitmap already in the store
+		return;
+		}
+
+	CFbsBitmap* bitmap = new(ELeave) CFbsBitmap;
+	CleanupStack::PushL(bitmap);
+	if (bitmap->Duplicate(aHandle)!=KErrNone)
+		aWindow->OwnerPanic(EWservPanicBitmap);
+	iFbsBitmapArray.InsertInOrderL(bitmap, TLinearOrder<CFbsBitmap>(InsertBitmapByHandle));
+	CleanupStack::Pop(bitmap);
+	}
+
+void CWsRedrawMsgWindow::AddWsBitmapsL(TInt aHandle, TInt aMaskHandle)
+	{
+	if (iWsWin->WsOwner() == NULL)
+		Panic(EWsPanicDrawCommandsInvalidState);
+	DWsBitmap * bmp = static_cast<DWsBitmap*>(iWsWin->WsOwner()->HandleToObj(aHandle, WS_HANDLE_BITMAP));
+	if (!bmp)
+		OwnerPanic(EWservPanicBitmap);
+	iCurrentSegment->AddWsBitmapL(bmp);
+	if (aMaskHandle)
+		{
+		bmp = static_cast<DWsBitmap*>(iWsWin->WsOwner()->HandleToObj(aMaskHandle, WS_HANDLE_BITMAP));
+		if (!bmp)
+			OwnerPanic(EWservPanicBitmap);
+		iCurrentSegment->AddWsBitmapL(bmp);
+		}
+	}
+
+void CWsRedrawMsgWindow::CRedrawSegment::AddWsBitmapL(DWsBitmap* bitmap)
+	{
+	iWsBitmapArray.AppendL(bitmap);
+	bitmap->IncRefCount();
+	}
+
+void CWsRedrawMsgWindow::AddWsFontL(TInt aHandle)
+	{
+	if (iWsWin->WsOwner()==NULL)
+		Panic(EWsPanicDrawCommandsInvalidState);
+	TDblQueIter<CWsFbsFont> iter(CWsFontCache::List());
+	CWsFbsFont* font=NULL;
+	while((font=iter++)!=NULL)
+		{
+		if (font->Handle()==aHandle)
+			break;
+		}
+	if (font)
+		{
+		iCurrentSegment->iWsFontArray.AppendL(font);
+		++(font->iCount);
+		}
+	}
+
+void CWsRedrawMsgWindow::CRedrawSegment::AddDrawerL(TGraphicDrawerId aDrawerId)
+	{
+	TInt error = iDrawerArray.InsertInOrder(aDrawerId, TLinearOrder<TGraphicDrawerId>(TGraphicDrawerId::Compare));
+	if (error != KErrAlreadyExists && error != KErrNone)
+		{
+		User::Leave(error);
+		}
+	}
+
+TBool CWsRedrawMsgWindow::CRedrawSegment::ContainsDrawers(const TArray<TGraphicDrawerId>& aDrawers,const TRegion& aRegion) const
+	{
+	TBool result = EFalse;
+	if (iDrawerArray.Count() > 0)
+		{
+		STACK_REGION tempRegion;
+		tempRegion.Intersection(iRegion, aRegion);
+		if (tempRegion.CheckError() || (tempRegion.Count() > 0) )
+			{ // regions do intersect, (presumed if region had an error); so check for a matching Id
+			const TInt drawersCount = aDrawers.Count();
+			for (TInt idx = 0; idx < drawersCount; ++idx)
+				{ // (iDrawerArray is kept sorted)
+				if (KErrNotFound != iDrawerArray.FindInOrder(aDrawers[idx], TLinearOrder<TGraphicDrawerId>(TGraphicDrawerId::Compare)))
+					{
+					result = ETrue;
+					break;
+					}
+ 					
+				const TInt count = iDrawerArray.Count();
+				for(TInt i = 0; i < count; i++)
+					{
+					const CWsGraphicDrawer* drawer = CWsTop::WindowServer()->ResolveGraphic(iDrawerArray[i]);
+					if(drawer && drawer->Contains(aDrawers))
+						{
+						result = ETrue;
+						break;
+						}
+					}
+				}
+			}
+		tempRegion.Close();
+		}
+	return result;
+	}
+
+inline TBool CWsRedrawMsgWindow::NoBuffer() const
+	{
+	return (iRedrawSegments.Count() == 0);
+	}
+
+void CWsRedrawMsgWindow::ClientExposing()
+	{
+	Invalidate();
+	}
+
+/*------------------------------------------------------------------------------
+  Description: If a complete set of drawing commands have been stored
+               this method attempts to draw ALL the commands via DrawCommandsL().
+               It also draws the window in the background colour if the window is
+               opaque.
+ -----------------------------------------------------------------------------*/
+void CWsRedrawMsgWindow::DrawWindow()
+	{
+	iFlags &= ~EPendingScheduledDraw;
+	// This is a happy window - it can draw itself whenever we ask.
+	if(iFlags&EBackgroundClear)
+		{
+		DrawBackgroundColor(iGlobalRedrawRegion);
+		}
+	// If valid commands have been stored, draw them.
+	if (iRedrawSegments.Count() > 0)
+		{
+		Lock();
+		TRAP_IGNORE(DrawCommandsL());
+		Unlock();
+		}
+	}
+
+void CWsRedrawMsgWindow::RemoveFromRedrawQueueIfEmpty()
+	{
+	if (iInvalid.Count()==0)
+		{
+		iInvalid.Clear();	// Ensures heap cell is freed, otherwise may be left as an empty cell
+		iWsWin->WsOwner()->RedrawQueue()->RemoveInvalid(this);
+		}
+	}
+
+TBool CWsRedrawMsgWindow::NeedsRedraw() const
+// If iInvalid has an persistant error it will not be reported as needing a redraw,
+// this is needed as otherwise cases where validation of a window results
+// in iInvalid having an error will get into an endless cycle of redraws.
+// The down side of this is that sometimes a window will not be sent a redraw
+// message when it needs it, some things can't be perfect!
+//
+	{
+	if ((!iWsWin->IsVisible()) || iInvalid.IsEmpty())
+		return EFalse;
+	
+	TRect nextRedrawRect;
+	return GetRedrawRect(nextRedrawRect);
+	}
+
+TBool CWsRedrawMsgWindow::GetRedrawRect(TRect &aRect) const
+	{
+	if (iWsWin->ClientSetInvisible())
+		return EFalse;
+	
+	if(InRedraw())
+		{
+		aRect = iRedrawRect;
+		return (!aRect.IsEmpty());
+		}
+	else if(iInvalid.CheckError())
+		{
+		if (iFlags & EStoringEntireWindow || iWsWin->VisibleRegion().CheckError())
+			{
+			aRect = iWsWin->AbsRect();
+			}
+		else
+			{
+			aRect = iWsWin->VisibleRegion().BoundingRect();
+			}
+		if (!(iFlags & EStoringEntireWindow))
+			iWsWin->ClipRectToViewport(aRect);
+		aRect.Move(-iWsWin->Origin());
+		return (!aRect.IsEmpty());
+		}
+	else if(iInvalid.Count())
+		{
+		if (iFlags & EStoringEntireWindow)
+			{
+			aRect = iInvalid.BoundingRect();
+			}
+		else
+			{
+			RWsRegion region;
+			region.Copy(iInvalid);
+			region.Offset(iWsWin->Origin());
+			region.Intersect(iWsWin->VisibleRegion());
+			if (region.CheckError())
+				{
+				aRect = iInvalid.BoundingRect();
+				aRect.Move(iWsWin->Origin());
+				}
+			else
+				{
+				aRect = region.BoundingRect();
+				}
+			region.Close();
+			iWsWin->ClipRectToViewport(aRect);
+			aRect.Move(-iWsWin->Origin());
+			}
+		return (!aRect.IsEmpty());
+		}
+	else
+		{
+		return EFalse;
+		}
+	}
+
+void CWsRedrawMsgWindow::ClipInvalidRegion(const TRect &aRect)
+	{
+	if (iInvalid.Count()>0)
+		{
+		iInvalid.ClipRect(aRect);
+		RemoveFromRedrawQueueIfEmpty();
+		}
+	}
+
+void CWsRedrawMsgWindow::EndRedraw()
+	{
+	++iCount;
+	if(!InRedraw())
+		OwnerPanic(EWservPanicDrawCommandsInvalidState);
+	if (iCurrentSegment)
+		{
+		iCurrentSegment->iDrawCommands->Compress();
+		if (iAtomicity==ENoAtomicity)
+			{
+			ScheduleUpdateOfSegment(iCurrentSegment);
+			}
+		else if(iAtomicity==ESegment)
+			{
+			PromoteLastPendingSegment();
+			ScheduleUpdateOfSegment(iCurrentSegment);
+			}
+		else if(iAtomicity==EWindow)
+			{
+			//only promote all pending segments when there are no invalid regions left in the window.
+			STACK_REGION regionAwaitingRedraws;
+			regionAwaitingRedraws.Copy(WsWin()->VisibleRegion());
+			regionAwaitingRedraws.Offset(-WsWin()->Origin());
+			regionAwaitingRedraws.Intersect(iInvalid);
+			if(regionAwaitingRedraws.IsEmpty())
+				PromoteAndUpdateAllPendingSegments();
+			regionAwaitingRedraws.Close();
+			}
+		}
+
+	iCurrentSegment = NULL;
+	iFlags&=~(ENoRepeatRedraw|EBeginEndRedraw);
+	}
+
+void CWsRedrawMsgWindow::ScheduleUpdateOfSegment(CRedrawSegment* aSegment)
+	{
+	// Schedule an update of the area of the screen we just drew to:
+	iFlags |= EPendingScheduledDraw;
+	if(iWsWin->VisibleRegion().Count() || iWsWin->VisibleRegion().CheckError())
+		{
+		STACK_REGION draw; //### in low memory where VisibleRegion() is intact we can degrade much better than this!
+		draw.Copy(aSegment->iRegion);
+		draw.Offset(iWsWin->Origin());
+		draw.Intersect(iWsWin->VisibleRegion());
+		if(!draw.CheckError())
+			Screen()->AddRedrawRegion(draw);
+		else
+			Screen()->AddRedrawRegion(iWsWin->VisibleRegion());
+		draw.Close();
+		}
+	}
+	
+void CWsRedrawMsgWindow::ValidateRect(const TRect *aRect)
+	{
+	if (!WsWin()->BaseParent())
+		OwnerPanic(EWservPanicParentDeleted);
+	if (aRect)
+		iRedrawRect = *aRect;
+	if (!iInvalid.IsEmpty())
+		{
+		STACK_REGION validated;
+		validated.Copy(iInvalid);
+		if (aRect)
+			validated.ClipRect(iRedrawRect);
+		
+		if (iInvalid.CheckError())
+			{
+			iInvalid.Copy(iWsWin->VisibleRegion());
+			iInvalid.Offset(-iWsWin->Origin());
+			}
+		iInvalid.SubRegion(validated);
+		validated.Close();		
+		}
+	RemoveFromRedrawQueueIfEmpty();
+	}
+
+TRgb CWsRedrawMsgWindow::BackColor() const
+	{
+	return(iBackColor);
+	}
+
+/**
+This function used to be quite clever about what it invalidated and what it redrew by copying
+rectangles of the screen around.  This is a lot less subtle, and makes calling Scroll pretty much
+pointless, but it IS functionally correct.
+*/
+void CWsRedrawMsgWindow::Scroll(const TRect &aClipRect, const TPoint &aOffset,const TRect &aRect)
+	{
+	TRect rect = aRect;
+	rect.Intersection(aClipRect);	
+	Invalidate(&rect);
+	rect = aRect;
+	rect.Move(aOffset);
+	rect.Intersection(aClipRect);
+	Invalidate(&rect);
+	}
+
+void CWsRedrawMsgWindow::ClearRedrawStore(TBool aClearPendingRedraw)
+	{
+	if(aClearPendingRedraw && (iFlags & EPendingScheduledDraw))
+		iFlags &= ~EPendingScheduledDraw;
+
+	DiscardStoredCommands();
+	Invalidate();
+	}
+
+
+void CWsRedrawMsgWindow::PrepareForResizeL(const TSize& aSize, TSize& /*aOldSize*/)
+	{
+	TBool anyIncreases(EFalse);
+	if (aSize.iWidth>iWsWin->Size().iWidth||aSize.iHeight>iWsWin->Size().iHeight)
+		{
+		anyIncreases = ETrue;
+		}
+
+	TRect newWinRect(TPoint(0,0),aSize);
+	iInvalid.ClipRect(newWinRect);
+	if (anyIncreases)
+		{
+		// add new invalid region to iInvalid
+		iInvalid.AddRect(newWinRect);
+		QueueRedraw();
+		iWsWin->WsOwner()->TriggerRedraw();
+		}
+	}
+
+void CWsRedrawMsgWindow::Moved()
+	{
+	if (!(iFlags & EStoringEntireWindow))
+		{
+		DiscardSegmentsOutsideViewport();
+		}
+	if (iInvalid.Count())
+		{
+		QueueRedraw();
+		iWsWin->WsOwner()->TriggerRedraw();
+		}
+	}
+
+TBool CWsRedrawMsgWindow::Contains(const TArray<TGraphicDrawerId>& aDrawers,const TRegion& aRegion) const
+	{
+	if (iRedrawSegments.Count() > 0)
+		{
+		// scan redraw store: calls Contains() on every region drawing commands are stored for,
+		// looking for a DrawWsGraphic command that intersects the aRegion
+		TBool contains = EFalse;
+		const TInt regionCount = iRedrawSegments.Count();
+		// loop through regions, stops when a match is found
+		for (TInt regionNum = 0; (regionNum < regionCount) && !contains; ++regionNum)
+			{
+			contains = iRedrawSegments[regionNum]->ContainsDrawers(aDrawers, aRegion);
+			}
+		return contains;
+		}
+	else
+		{
+		return CWsWindowRedraw::Contains(aDrawers,aRegion);
+		}
+	}
+
+
+void CWsRedrawMsgWindow::SetScope(TScope aScope)
+	{
+	if (aScope == EStoreEntireWindow)
+		{
+		if (!(iFlags & EStoringEntireWindow))
+			{
+			iFlags |= EStoringEntireWindow;
+			Invalidate();
+			}
+		}
+	else
+		{
+		if (iFlags & EStoringEntireWindow)
+			{
+			iFlags &= ~ EStoringEntireWindow;
+			DiscardSegmentsOutsideViewport();
+			}
+		}
+	}
+
+/**
+Removes all segments from the redraw store which are outside the viewport onto the window.
+Note that this doesn't clip the regions of those segments which are partly outside, since
+this wouldn't actually achieve anything useful.
+
+This function allocates memory so it is not suitable to run as part of ReleaseMemory.
+*/
+TBool CWsRedrawMsgWindow::DiscardSegmentsOutsideViewport()
+	{
+	TBool discarded = EFalse;
+	TInt count = iRedrawSegments.Count();
+	STACK_REGION viewport;
+	CliWin()->SetClippedBaseArea(viewport);
+	viewport.Offset(-iWsWin->Origin());
+	STACK_REGION intersect;
+	for (TInt idx = count - 1; idx >= 0; --idx)
+		{
+		CRedrawSegment * segment = iRedrawSegments[idx];
+		intersect.Intersection(segment->iRegion, viewport);
+		if (!intersect.CheckError() && intersect.IsEmpty())
+			{
+			iInvalid.Union(segment->iRegion);
+			delete segment;
+			iRedrawSegments.Remove(idx);
+			if (iCurrentSegment == segment)
+				iCurrentSegment = NULL;
+			discarded = ETrue;
+			}
+		}
+	intersect.Close();
+	viewport.Close();
+	return discarded;
+	}
+
+/**
+Statements encapsulated in between Lock() and Unlock() is guaranteed to execute in an 
+atomic way without being interupted by a call to ReleaseMemory from CWsMemoryManager. 
+Locking will prevent memory belonging to this object to be freed during a 
+memory alloc/realloc originating from self.
+*/
+void CWsRedrawMsgWindow::Lock()
+	{
+	++iMemoryLock;
+	}
+	
+void CWsRedrawMsgWindow::Unlock()
+	{
+	--iMemoryLock;
+	WS_ASSERT_DEBUG(iMemoryLock >= 0, EWsPanicMemoryLock);
+	}
+
+TBool CWsRedrawMsgWindow::ReleaseMemory(MWsMemoryRelease::TMemoryReleaseLevel aLevel)
+	{
+	//When this function is called, wserv is in the middle of executing something.
+	//Therefore we can not safely do anything that alters the state of any shared 
+	//resouces (like e.g. CScreenRedraw::iInvalid).
+	//In addition, we should refrain from anything that might try to allocate memory.
+	TBool released = EFalse;
+	//Don't release iRedrawSegments from this win if its currently being rendered, 
+	//is releasing memory or is receiving drawcommands.
+	if (iMemoryLock == 0 && !iCurrentSegment)
+		{
+		Lock();
+		switch (aLevel)
+			{
+			case MWsMemoryRelease::ELow:
+				break;
+			case MWsMemoryRelease::EMedium:
+				break;
+			case MWsMemoryRelease::EHigh:
+				//Only release memory from background windows.
+				if (iRedrawSegments.Count() > 0 && iWsWin->VisibleRegion().IsEmpty())
+					{
+					ReleaseRedrawSegments();
+					released = ETrue;
+					}
+				break;
+			}
+		Unlock();
+		}
+	return released;
+	}
+
+void CWsRedrawMsgWindow::ReleaseRedrawSegments()
+	{
+ 	iLastDrawGc = NULL;
+ 	iCurrentSegment = NULL;
+ 	iRedrawSegments.ResetAndDestroy();
+ 	
+ 	//The call to ResetAndDestroy just freed some memory so it should be 
+ 	//possible to call Invalidate() now.
+ 	Invalidate(); 
+ 	
+ 	//Releasing the same window over and over again could quickly end up in 
+ 	//a never ending loop with a high-prio client before we find the window
+ 	//that has nicked all memory. So call accessed now to prevent that.
+ 	iWsWin->Accessed(); 
+   	}
+
+void CWsRedrawMsgWindow::VisibleRegionChange()
+	{
+	if (!iFlags & EStoringEntireWindow)
+		{
+		DiscardSegmentsOutsideViewport();
+		}
+	if ((!iInvalid.IsEmpty()) && (!iWsWin->VisibleRegion().IsEmpty()))
+		{
+		STACK_REGION exposed;
+		exposed.Copy(iInvalid);
+		exposed.Offset(iWsWin->Origin());
+		exposed.Intersect(iWsWin->VisibleRegion());
+		if (!exposed.IsEmpty())
+			{
+			QueueRedraw();
+			}
+		exposed.Close();
+		}
+	}
+	
+TBool CWsRedrawMsgWindow::ReadyToDraw() const
+	{
+	//We are only ready to draw when we have a complete segment.
+	if (iWsWin->HasBeenDrawnToScreen())
+		return ETrue;
+	
+	if (iRedrawSegments.Count() == 0)
+		return EFalse;
+	
+	if (iRedrawSegments.Count() > 1)
+		return ETrue;
+	
+	if (iRedrawSegments[0]->iRedrawSegmentType == ESegmentTypePendingRedraw)
+		return EFalse;
+	
+	return ETrue;
+	}
+
+TInt CWsRedrawMsgWindow::SizeInBytes() const
+	{
+	TInt size = sizeof(CWsRedrawMsgWindow);
+	for(TInt i = iRedrawSegments.Count()-1; i >= 0; i--)
+		{
+		size += iRedrawSegments[i]->SizeInBytes();
+		}
+	size += iInvalid.Count() * sizeof(TRect);
+	size += iLocalRedrawRegion.Count() * sizeof(TRect);
+	return size;
+	}
+
+void CWsRedrawMsgWindow::PromoteLastPendingSegment()
+	{
+	if (iRedrawSegments.Count() > 0 && iRedrawSegments[iRedrawSegments.Count() - 1]->iRedrawSegmentType == ESegmentTypePendingRedraw)
+		{
+		CRedrawSegment * segment = iRedrawSegments[iRedrawSegments.Count() - 1];
+		const TRect * rect = segment->iRegion.RectangleList();
+		// when we get here there should only ever be one rectangle in the region, but we are playing safe
+		for (TInt r = 0; r < segment->iRegion.Count(); ++r)
+			{
+			SubtractRectFromSegmentArray(*rect);			
+			++rect;
+			}
+		segment->iRedrawSegmentType = ESegmentTypeRedraw;
+		}
+	}
+	
+void CWsRedrawMsgWindow::PromoteAndUpdateAllPendingSegments()
+	{
+	for(TInt i =0; i<iRedrawSegments.Count(); i++)
+		{
+		CRedrawSegment * segment = iRedrawSegments[i];
+		if (segment->iRedrawSegmentType == ESegmentTypePendingRedraw)
+			{
+			const TRect * rect = segment->iRegion.RectangleList();
+			TInt totalRemovedSegments = 0;
+			for (TInt r = 0; r < segment->iRegion.Count(); ++r)
+				{
+				totalRemovedSegments += SubtractRectFromSegmentArray(*rect);			
+				++rect;
+				}
+			//we need to decrement the loop count to take into account any removed segments so we
+			//make sure we iterate over every segment in the array.
+			i-=totalRemovedSegments;
+			segment->iRedrawSegmentType = ESegmentTypeRedraw;
+			ScheduleUpdateOfSegment(segment);
+			}
+		}
+	}