camappengine/StillConverter/Inc/CaeStillDecoder.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2002 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:  Still Image Decoder for Camera Application Engine
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*
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*/
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#ifndef CAESTILLDECODER_H
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#define CAESTILLDECODER_H
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// INCLUDES
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#include <e32base.h>
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#include <s32file.h>
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#include <imageconversion.h>
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#include <ecam.h>
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// CLASS DECLARATION
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/**
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*  Still decoder observer class.
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*  User of CCaeStillDecoder class must derive from this interface.
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*
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* @lib CAESTILLCONVERTER.LIB
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* @since 2.1
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*/
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class MCaeStillDecoderObserver
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    {
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    public:
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        /**
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        * Called back by CCaeStillDecoder when it completes conversion (decoding) to CFbsBitmap image.
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        * @since 2.1
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        * @param aImageData Source image (as JPEG)
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        * @param aBitmap Converted Symbian OS bitmap image
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        * @param aError Error code KErrNone to indicate success or a standard Symbian OS error code
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        * @param aImageSize Decoded image size
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        * @return void
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        */
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        virtual void McaesdoCFbsBitmapImageReady( 
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            HBufC8* aImageData, 
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            CFbsBitmap* aBitmap, 
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            TInt aError,
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            TInt aImageSize ) = 0;
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    };
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// CLASS DECLARATION
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/**
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* Still Decoder class.
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* Implements still image decoding for Camera Application Engine 
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* using Symbian Image Conversion Library (ICL)
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*
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* @lib CAESTILLCONVERTER.LIB
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* @since 2.1
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*/
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NONSHARABLE_CLASS( CCaeStillDecoder ) : public CCaeStillConverter
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    {
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    public:  // Constructor and destructor    
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        /**
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        * Two-phased constructor.
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        */
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        IMPORT_C static CCaeStillDecoder* NewL();
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        /**
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        * Destructor.
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        */
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        IMPORT_C virtual ~CCaeStillDecoder();
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    public: // From CCaeStillConverter:
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        void SetImageCodecL( 
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        	TUid aCodecUid );
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    public: // New functions
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        /**
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        * Sets Still Decoder observer.
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        * @since 2.1
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        * @param aObserver Still Decoder observer
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        * @return void
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        */
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        IMPORT_C void SetObserver( 
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            MCaeStillDecoderObserver* aObserver );
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        /** 
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        * Creates the CImageItem object, places it in the internal queue and 
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        * starts the memory image conversion where the memory image (e.g. JPEG) 
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        * is converted to bitmap. 
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        * @param aImageBuffer Memory image to convert. Ownership is given.
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        * @param aTargetBitmapMode Target/destination bitmap color mode
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        * @param aTargetBitmapSize Target/destination bitmap size without free scaling decoder
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        * @param aFullyScaledTargetBitmapSize Target/destination bitmap size with free scaling decoder
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        * @return void
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        */
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        IMPORT_C void ConvertHBufC8ToCFbsBitmapL( 
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            HBufC8* aImageBuffer,
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            TDisplayMode aTargetBitmapMode,
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            const TSize& aTargetBitmapSize,
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            const TSize& aFullyScaledTargetBitmapSize = TSize( 0, 0 ) );
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        /**
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        * Destroys all allocations for decoding, as the images from the queue.
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        * @return void
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        */
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        IMPORT_C void Cleanup();
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    protected: // Constructors
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        /**
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        * C++ constructor.
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        */
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        CCaeStillDecoder();
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        /**
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        * Symbian 2nd phase constructor that can leave.
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        */
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        void ConstructL();
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    private: // From CCaeStillConverter:
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        /**
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        * From CActive, implements cancellation of an outstanding request.
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        * @return void
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        */
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        void DoCancel();
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    protected: // From CCaeStillConverter
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        void ConvertL();
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        void ConversionComplete( 
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            TInt aError );
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    private: // Data
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        // Still Decoder observer.
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        MCaeStillDecoderObserver* iObserver;
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        // Pointer to ICL decoder object.
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        CImageDecoder* iDecoder;
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        // Pointer to decoded image.
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        CFbsBitmap* iDecodedImage;
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        // Class wide file server handle for file operations
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        RFs iFs;
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    };
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#endif // CAESTILLDECODER_H   
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// End of File