camappengine/StillConverter/Inc/CaeStillEncoder.h
author Pat Downey <patd@symbian.org>
Wed, 01 Sep 2010 12:23:23 +0100
branchRCL_3
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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 Encoder for Camera Application Engine
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*
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*/
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#ifndef CAESTILLENCODER_H
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#define CAESTILLENCODER_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 "CaeStillConverter.h"
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// CONSTANTS
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const TInt KJpegQualityMin = 0;
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const TInt KJpegQualityMax = 100;
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const TJpegImageData::TColorSampling KCaeJpegColorSampling = TJpegImageData::EColor420;
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// CLASS DECLARATION
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/**
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*  Still encoder observer class.
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*  User of CCaeStillEncoder 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 MCaeStillEncoderObserver
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    {
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    public:
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        /**
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        * Called back by CCaeStillEncoder when it completes conversion (encoding) to HBufC8 image data (as JPEG).
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        * single media item during media items enumeration.
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        * @since 2.1
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        * @param aBitmap Source Symbian OS bitmap image
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        * @param aImageData Converted image (as JPEG)
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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 Encoded image size
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        * @return void
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        */
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        virtual void McaeseoHBufC8ImageReady(
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            CFbsBitmap* aBitmap,
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            HBufC8* aImageData, 
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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 Encoder class. Derived from CaeStillConverter. 
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* Implements still image encoding 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( CCaeStillEncoder ) : public CCaeStillConverter
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    {
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    public: // Conversion target image type.
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        enum TTargetFormat
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            {
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            ETargetFormatJPEG
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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 CCaeStillEncoder* NewL();
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        /**
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        * Destructor.
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        */
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        IMPORT_C virtual ~CCaeStillEncoder();
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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 Encoder observer.
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        * @since 2.1
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        * @param aObserver Still Encoder observer
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        * @return void
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        */
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        IMPORT_C void SetObserver( 
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            MCaeStillEncoderObserver* aObserver );
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        /**
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        * Sets compression quality.
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        * @since 2.1
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        * @param aQuality Compression quality
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        * @return void
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        */
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        IMPORT_C void SetCompressionQuality( 
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            TInt aQuality );
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        /**
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        * Gets compression quality.
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        * @since 2.1
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        * @return Compression quality
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        */
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        IMPORT_C TInt CompressionQuality() const;
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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 bitmap is 
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        * converted to another format (e.g. JPEG). 
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        * @since 2.1
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        * @param aBitmap Bitmap to convert
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        * @param aTargetFormat Target/destination image format (JPEG by default)
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        * @return void
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        */
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        IMPORT_C void ConvertCFbsBitmapToHBufC8L( 
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            CFbsBitmap* aBitmap,
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            TTargetFormat aTargetFormat = ETargetFormatJPEG );
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        /**
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        * Destroys all allocations for encoding, 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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    private: // Constructors
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        /**
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        * C++ constructor.
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        */
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        CCaeStillEncoder();
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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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    private: // 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 Encoder observer.
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        MCaeStillEncoderObserver* iObserver;
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        // Pointer to ICL encoder object.
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        CImageEncoder* iEncoder;
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        // Pointer to encoded image.
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        HBufC8* iEncodedImage;
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        // Quality factor for JPEG images.
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        TInt iJpegQuality;
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    };
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#endif // CAESTILLENCODER_H
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// End of File