--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/imaging/imagingfws/ImageProcessor/src/imageprocessorcallback.h	Wed Aug 25 12:29:52 2010 +0300
@@ -0,0 +1,79 @@
+// Copyright (c) 2008-2009 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:
+//
+
+#ifndef __IMAGE_PROCESSOR_CALLBACK_H__
+#define __IMAGE_PROCESSOR_CALLBACK_H__
+
+#include <e32base.h>
+
+namespace ImageProcessor 
+	{
+
+class MImgProcessorObserver;
+class CImgProcessor;
+
+/* AO for callback makes concurrency issues easier when client makes calls
+from callback e.g. deletes image processor from within a callback.
+Callbacks must be able to succeed (or at least a best effort to ensure
+that they will succeed. e.g. client may wait indefinately if ImageProcessingComplete
+callback cannot be made because of OOM.
+Some callbacks are not in direct response to client request.
+e.g. Progress indications - Can possibly use a pre-allocated queue.
+The AO must be able to handle multiple outstanding callbacks.
+At the moment simultaneous Processing & Rendering is not supported (CAPS restriction)
+A work around is possible but then the callback AO should also be able to handle it.
+The callback AO must be running at a higher priority than the worker AO, to ensure
+callbacks are not delayed (e.g. receiving all progress callbacks only after processing had completed)*/
+
+NONSHARABLE_CLASS(CImageProcessorCallback) : public CActive
+   {
+public:
+   static CImageProcessorCallback* NewL(CImgProcessor& aImageProcessor,MImgProcessorObserver& aObserver);
+   ~CImageProcessorCallback();
+
+   void AddCallback(TInt aEventId, TUid aUid, TInt aId, TInt aError);
+
+private:
+	class TCallbackInfo
+		{
+	public:	
+		TCallbackInfo(TInt aEventId, TUid aUid, TInt aId, TInt aError);
+		
+	public:
+		TInt iEventId;
+		TUid iUid;
+		TInt iId;
+		TInt iError;
+		};
+
+	CImageProcessorCallback(CImgProcessor& aImageProcessor, MImgProcessorObserver& aObserver);
+	void ConstructL();
+	void SelfComplete();
+	
+	//from CActive
+	void RunL();
+	void DoCancel();
+
+	void EnsureSpace();
+	
+private:
+	CImgProcessor& iProcessor;
+	MImgProcessorObserver& iObserver;
+	RArray<TCallbackInfo> iCallbackInfo;
+	};
+
+	}
+
+#endif //__IMAGE_PROCESSOR_CALLBACK_H__