windowing/windowserver/stdgraphic/TESTGRAPHICDRAWER.CPP
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:47:50 +0200
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permissions -rw-r--r--
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// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include "wsgraphicdrawercontext.h"
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#include "stdgraphictestdrawer.h"
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CWsGraphicDrawerTestFrameRate* CWsGraphicDrawerTestFrameRate::CreateL()
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	{
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	return new(ELeave) CWsGraphicDrawerTestFrameRate;
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	}
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CWsGraphicDrawerTestFrameRate::CWsGraphicDrawerTestFrameRate()
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	{
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	}
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CWsGraphicDrawerTestFrameRate::~CWsGraphicDrawerTestFrameRate()
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	{
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	if (iContext)
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		{
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		iContext->Destroy();
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		iContext = NULL;
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		}
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	}
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void CWsGraphicDrawerTestFrameRate::ConstructL(MWsGraphicDrawerEnvironment& aEnv,const TGraphicDrawerId& aId,MWsClient& aOwner,const TDesC8& /*aData*/)
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	{
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	BaseConstructL(aEnv,aId,aOwner);
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	if (!(aEnv.Screen(0)->ResolveObjectInterface(KMWsCompositionContext) || aEnv.Screen(0)->ResolveObjectInterface(KMWsScene)))
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		{
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		iContext = CWsGraphicDrawerNonNgaContext::NewL();
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		}
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	else
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		{
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		iContext = CWsGraphicDrawerNgaContext::NewL();
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		}
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	}
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void CWsGraphicDrawerTestFrameRate::DoDraw(MWsGc& aGc,const TRect& aRect,const TDesC8& /*aData*/) const
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	{
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	if (KErrNone != iContext->Push(aGc))
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		{
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		return;
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		}
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	//Simplification: treats all screens the same
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	iContext->DrawFrameRate(aGc, aRect, iFps);
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	//Count this draw		
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	iFps.Sample();
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	//Schedule a redraw
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	iContext->ScheduleAnimation(aGc,aRect,0); // as fast as possible
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	iContext->Pop(aGc);
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	}
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void CWsGraphicDrawerTestFrameRate::HandleMessage(const TDesC8& /*aData*/)
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	{
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	}
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TInt CFrameRate::Fps() const
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	{
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	if(iNumSamples > 1)
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		{
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		const TUint count = Min(iNumSamples,KMaxSamples);		
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		TInt64 earliest = iSamples[0];
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		TInt64 latest = earliest;
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		for(TInt i=1; i<count; i++)
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			{
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			const TInt64 sample = iSamples[i];
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			earliest = Min(earliest,sample);
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			latest = Max(latest,sample);
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			}
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		const TInt64 duration = latest - earliest;
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		const TInt microspf = (duration / count);
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		if(microspf)
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			{
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			const TInt millispf = (microspf / 1000);
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			if(millispf)
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				{
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				const TInt fps = (1000 / millispf);
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				return fps;
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				}
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			}
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		}
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	return 0;
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	}
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TInt CFrameRate::CountSamples() const
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	{
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	return iNumSamples;
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	}
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void CFrameRate::Sample() const
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	{
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	//Add the current tick to the stats for next time
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	TTime now;
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	now.UniversalTime();
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	iSamples[iNumSamples % KMaxSamples] = now.Int64();
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	iNumSamples++;
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	}