photosgallery/slideshow/engine/effectsrc/shwdefaulteffectmanager.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 11 May 2010 16:13:40 +0300
branchRCL_3
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permissions -rw-r--r--
Revision: 201017 Kit: 201019
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/*
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* Copyright (c) 2007-2008 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:    Default effect order manager
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 *
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*/
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//  Include Files
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#include "shwdefaulteffectmanager.h"
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#include <e32math.h>
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#include <glxlog.h>
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#include <glxtracer.h>
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#include "shwcleanupwrapper.h"
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#include "shweffect.h"
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#include "shwconstants.h"
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#include "shwslideshowenginepanic.h"
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// -----------------------------------------------------------------------------
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// C++ Constructor. Save a few bits of rom with inlining
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// -----------------------------------------------------------------------------
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inline CShwDefaultEffectManager::CShwDefaultEffectManager()
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	: iEffectOrder( MShwEffectManager::EEffectOrderLinear )	// default order
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	{
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	TRACER("CShwDefaultEffectManager::CShwDefaultEffectManager()");
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	GLX_LOG_INFO( "CShwDefaultEffectManager::CShwDefaultEffectManager()" );
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	// no implementation required
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	}
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// -----------------------------------------------------------------------------
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// NewL. Static construction
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// -----------------------------------------------------------------------------
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CShwDefaultEffectManager* CShwDefaultEffectManager::NewL()
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	{
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	TRACER("CShwDefaultEffectManager::NewL()");
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	GLX_LOG_INFO( "CShwDefaultEffectManager::NewL" );
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	CShwDefaultEffectManager* self = new( ELeave ) CShwDefaultEffectManager;
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	return self;
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	}
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// -----------------------------------------------------------------------------
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// Destructor.
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// -----------------------------------------------------------------------------
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CShwDefaultEffectManager::~CShwDefaultEffectManager()
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	{
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	TRACER("CShwDefaultEffectManager::~CShwDefaultEffectManager");
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	GLX_LOG_INFO( "CShwDefaultEffectManager::~CShwDefaultEffectManager" );
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	// Delete the effect objects
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	ResetAndDestroyEffects( iAvailableEffects );
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	iAvailableEffects.Close();
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	// Close the "working" effects array
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	// Note that iEffects just references the same elements as iAvailableEffects
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	// so don't delete them again.
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	iEffects.Close();
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	}
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// -----------------------------------------------------------------------------
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// AddEffectL.
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// -----------------------------------------------------------------------------
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void CShwDefaultEffectManager::AddEffectL( MShwEffect* aEffect )
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	{
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	TRACER("CShwDefaultEffectManager::AddEffectL");
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    GLX_LOG_INFO( "CShwDefaultEffectManager::AddEffectL" );
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    // dont add NULLs to the array
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    if( aEffect )
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    	{
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		iAvailableEffects.AppendL( aEffect );
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    	}
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	}
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// -----------------------------------------------------------------------------
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// CurrentEffect.
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// -----------------------------------------------------------------------------
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MShwEffect* CShwDefaultEffectManager::CurrentEffect()
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	{
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	TRACER("CShwDefaultEffectManager::CurrentEffect");
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	GLX_LOG_INFO( "CShwDefaultEffectManager::CurrentEffect" );
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	// check that we have something in iEffects
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	__ASSERT_DEBUG( iEffects.Count() > 0 && iEffects.Count() > iCurrentEffect,
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		NShwEngine::Panic( NShwEngine::EIncorrectEffectIndex ) );
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	return iEffects[ iCurrentEffect ];
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	}
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// -----------------------------------------------------------------------------
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// Effect
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// -----------------------------------------------------------------------------
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MShwEffect* CShwDefaultEffectManager::Effect( TInt aDirection )
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	{
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	TRACER("CShwDefaultEffectManager::Effect");
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	GLX_LOG_INFO1( "CShwDefaultEffectManager::Effect, direction %d",
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		aDirection );
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	// check that we have something in iEffects
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	__ASSERT_DEBUG( iEffects.Count() > 0 && iEffects.Count() > iCurrentEffect,
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		NShwEngine::Panic( NShwEngine::EIncorrectEffectIndex ) );
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   113
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	TInt nextEffectIndex = CalculateNextEffectIndex( aDirection );
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	return iEffects[ nextEffectIndex ];
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	}
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// -----------------------------------------------------------------------------
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// ProceedToEffect.
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// -----------------------------------------------------------------------------
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void CShwDefaultEffectManager::ProceedToEffect( TInt aDirection )
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	{
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	TRACER("CShwDefaultEffectManager::ProceedToEffect");
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	GLX_LOG_INFO1( "CShwDefaultEffectManager::ProceedToEffect,\
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		direction %d", aDirection );
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	// calculate new effects
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	CalculateEffects( aDirection );
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	}
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// -----------------------------------------------------------------------------
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// SetEffectOrder.
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// -----------------------------------------------------------------------------
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void CShwDefaultEffectManager::SetEffectOrder(MShwEffectManager::TShwEffectOrder
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	aOrder)
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    {
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    TRACER("CShwDefaultEffectManager::SetEffectOrder");
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    GLX_LOG_INFO("CShwDefaultEffectManager::SetEffectOrder");
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    iEffectOrder = aOrder;
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    /// @todo implement the rest for increment 7
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    }
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// -----------------------------------------------------------------------------
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// EffectOrder.
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// -----------------------------------------------------------------------------
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MShwEffectManager::TShwEffectOrder CShwDefaultEffectManager::EffectOrder()
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    {
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    TRACER("CShwDefaultEffectManager::EffectOrder");
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    GLX_LOG_INFO("CShwDefaultEffectManager::EffectOrder");
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    return iEffectOrder;
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    }
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// -----------------------------------------------------------------------------
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// SetProgrammedEffects.
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// -----------------------------------------------------------------------------  
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void CShwDefaultEffectManager::SetProgrammedEffects( 
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	RArray<TShwEffectInfo>& /*aEffects*/ )
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    {
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    TRACER("CShwDefaultEffectManager::SetProgrammedEffects");
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    GLX_LOG_INFO("CShwDefaultEffectManager::SetProgrammedEffects");
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    /// @todo implement for increment 7
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    }
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// -----------------------------------------------------------------------------
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// SetDefaultEffect.
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// -----------------------------------------------------------------------------
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void CShwDefaultEffectManager::SetDefaultEffectL( TShwEffectInfo aInfo )
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    {
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    TRACER("CShwDefaultEffectManager::SetDefaultEffectL");
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	GLX_LOG_INFO( "CShwDefaultEffectManager::SetDefaultEffectL" );
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	// Loop through the effects to find the one with matching info
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	TInt index = iAvailableEffects.Count();
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	MShwEffect* effect = NULL;
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	while( index-- > 0 )
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		{
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		// get effect
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		effect = iAvailableEffects[ index ];
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		// get its info
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		TShwEffectInfo info = effect->EffectInfo();
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		// check if we got a match
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		if( info == aInfo )
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			{
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			break;
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			}
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		}
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	// if no effect or no match
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	if( !effect || index < 0 )
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		{
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		// effect not found
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    	User::Leave( KErrArgument );
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		}
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	// Need to clone the effect as in current release
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	// we have once single effect at a time and one effect instance can only
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	// handle one visual
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	/// @todo fix this so that once the effect order is solved, the effects
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	/// are cloned as needed
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	MShwEffect* clone = effect->CloneLC();
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	iAvailableEffects.AppendL( clone );
22
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   200
	
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    // This will cause a code scanner warning, but it is not possible to do 
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    // CleanupStack::Pop(clone) because the pointer pushed 
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    // onto the cleanup stack was either of class CShwZoomAndPanEffect
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    // or a CShwCrossFadeEffect and the object 'clone' is of
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    // class MShwEffect
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    CleanupStack::Pop(); //clone
0
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    iEffects.Append( effect );
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    iEffects.Append( clone );
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   210
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	// calculate the effects    
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    CalculateEffects( 1 );
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    }
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// -----------------------------------------------------------------------------
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// GetActiveEffectsL
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// -----------------------------------------------------------------------------
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void CShwDefaultEffectManager::GetActiveEffectsL( 
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	RPointerArray< MShwEffect >& aEffects )
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    {
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    TRACER("CShwDefaultEffectManager::GetActiveEffectsL");
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    GLX_LOG_INFO( "CShwDefaultEffectManager::GetActiveEffectsL" );
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    ShwCleanupResetAndDestroyPushL(aEffects);
0
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    // Retrieve each effect
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    for( TInt i = 0; i < iEffects.Count(); ++i )
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        {
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        // append the effect pointer to the given array
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        aEffects.AppendL( iEffects[i] );  
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        }
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    CleanupStack::Pop(&aEffects);
0
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    }
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// -----------------------------------------------------------------------------
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// CalculateEffects.
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// -----------------------------------------------------------------------------
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void CShwDefaultEffectManager::CalculateEffects( TInt aDirection )
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    {
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    TRACER("CShwDefaultEffectManager::CalculateEffects");
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	GLX_LOG_INFO1( "CShwDefaultEffectManager::CalculateEffects,\
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		direction %d", aDirection );
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    // This method updates both the current and next indices for the given
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    // direction.  If we're proceeding forwards, temporarily store the
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    // "next" index to set it as "current" after the new "next" value has 
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    // been determined (as the next value is determined from the current value).
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    if ( aDirection > 0 )
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    	{
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    	// Next effect is "forward"
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    	iCurrentEffect = iNextEffect;
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    	}
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    else
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    	{
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    	// moving "backwards"
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    	iNextEffect = iCurrentEffect;
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    	}
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    if( iEffectOrder == MShwEffectManager::EEffectOrderLinear )
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        {
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        // As iAvailableEffects is used to store the effects it can be 
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        // walked directly and the order will always be correct
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        //
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        TInt nextEffect = CalculateNextEffectIndex( aDirection );
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        if ( aDirection > 0 )
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        	{
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        	// moving forwards
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			iNextEffect = nextEffect;
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        	}
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        else
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        	{
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        	// moving backwards
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        	iCurrentEffect = nextEffect;
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        	}
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		}
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    }
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// -----------------------------------------------------------------------------
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// ResetAndDestroyEffects.
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// -----------------------------------------------------------------------------
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void CShwDefaultEffectManager::ResetAndDestroyEffects(RArray< MShwEffect* >&
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	aArray)
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    {
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    TRACER("CShwDefaultEffectManager::ResetAndDestroyEffects");
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    // get the count
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    TInt count = aArray.Count();
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	GLX_LOG_INFO1( 
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		"CShwDefaultEffectManager::ResetAndDestroyEffects %d", count );
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    // Delete the effect objects
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	for( TInt i = 0; i < count; i++ )
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		{
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		// call the destructor
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		delete aArray[ i ];
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		}
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	aArray.Reset();
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    }
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// -----------------------------------------------------------------------------
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// CalculateNextEffectIndex.
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// -----------------------------------------------------------------------------
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TInt CShwDefaultEffectManager::CalculateNextEffectIndex( TInt aDirection )
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	{
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	TRACER("CShwDefaultEffectManager::CalculateNextEffectIndex");
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	GLX_LOG_INFO1( 
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	        "CShwDefaultEffectManager::CalculateNextEffectIndex %d", aDirection);
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	TInt effectsCount = iEffects.Count();	
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	// Guard against direction exceeding the number of effects
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	TInt direction = aDirection % effectsCount;	
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	TInt nextEffect = iCurrentEffect + direction;
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   308
	
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	// ensure index is still in bounds
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	if ( nextEffect < 0 )
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		{
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		// -ve index: wrap around to the last element
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		nextEffect = effectsCount - 1;
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		}
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	else if ( nextEffect >= effectsCount )
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		{
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		// passed the end so return to the start.
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		nextEffect = 0;
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		}
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	return nextEffect;
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   321
	}