// Copyright (c) 2002-2009 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:

// Not for public use

// Provides information to the main ICL body classes about their environment, plus some env sensitive ops

// 

//

#ifndef __ImagePrivSupport_h

#define __ImagePrivSupport_h

#include <e32base.h>

// provide info to the decoder about its interface

class MImageDecoderPrivSupport

	{

public:

	/*

	 * Must use local buffer, even when decoding from descriptor

	 */

	virtual TBool MustUseBufferWithDescriptor() const=0;

	/*

	 * Copy from descriptor to indicated buffer

	 */

	virtual void CopyBufferToDescriptor(TDes8& aBuffer, const TDesC8& aSource, TInt aPosition, TInt aSize)=0;

	/**

	 *  Indicate if running in a separate thread

	 */

	virtual TBool AmInThread() const=0;

	/**

	 *  Indicate if a decode should abort early (ie. following a Cancel). Always false unless in a thread.

	 */

	virtual TBool ShouldAbort() const=0;

	/**

	 * Mutual exclusion lock - use on the frame tables to avoid update problems with threaded decode

	 * For non-threaded implementation will be a no-op.

	 */

	virtual void Lock()=0;

	/**

	 * Mutual exclusion unlock - opposit of Lock()

	 * For non-threaded implementation will be a no-op.

	 */

	virtual void Unlock()=0;

	/**

	 * Save the framecount - should be called whenever the framecount is successfully incremented

	 * Optionally used to avoid checking the framecount directly during threading. This call should

	 * only be made when we having finished setting up the frame's details.

	 * For non-threaded implementation will be a no-op.

	 */

	virtual void SaveFrameCount(TInt aFrameCount)=0;

	};

// provide info to the decoder about its interface

class MImageEncoderPrivSupport

	{

public:

	/**

	 *  Indicate if running in a separate thread

	 */

	virtual TBool AmInThread() const=0;

	/**

	 *  Indicate if a decode should abort early (ie. following a Cancel). Always false unless in a thread.

	 */

	virtual TBool ShouldAbort() const=0;

	};

#endif  // __ImagePrivSupport_h