cameracaptureengine.h

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/*
* ============================================================================
*  Name     : CameraCapureEngine.h
*  Part of  : CameraApp
*  Description: Provides all still image releated methods. 
*               Interface to Symbian Onboard Camera API.
*  Created  : 05/06/2006 by Forum Nokia
*  Version  : 2.0
*  Copyright: Nokia Corporation, 2006
* ============================================================================
*/

#ifndef __CAMERA_CAPTURE_ENGINE_H__
#define __CAMERA_CAPTURE_ENGINE_H__

#include <f32file.h>
#include <e32std.h>
#include <gdi.h>
#include <ECam.h>
#include <ccamautofocus.h>

#include "CameraApp.hrh"
#include "CameraAppController.h"

//Color sampling used with the JPEG encoder
const TJpegImageData::TColorSampling KCameraColorSampling = 
    TJpegImageData::EColor420;

class CWsBitmap;

/**
* Provides all still image releated methods.
*/
class CCameraCaptureEngine : public CActive, 
                             public MCameraObserver,
                             public MCamAutoFocusObserver
    {
    public: // Constructors and destructor
        /**
         * Two-phased constructor.
         * @return CCameraCapureEngine*
         */
        static CCameraCaptureEngine* NewL( CCameraAppController& aController,
            const TRect& aRect );
        
        /**
         * Destructor
         */
        virtual ~CCameraCaptureEngine();

    private:
        /**
         * Symbian OS default constructor.
         */
        CCameraCaptureEngine( CCameraAppController& aController );

        /**
         * Symbian OS constructor.
         */
       void ConstructL(const TRect& aRect);

    public: // New Functions
        /**
         * Check whether the camera is being used by another app.
         * @return, true if it used by another app. 
         */
        TBool IsCameraUsedByAnotherApp();
        
        /**
         * Check whether viewfinder is currently active
         * @return TBool
         */
        TBool IsViewFinderActive();
        
        /**
         * Check for AF support
         * @return TBool
         */
        TBool IsAutoFocusSupported();
        

        /**
         * Set the engine state	
         */
        void SetEngineState( TEngineState aState );

        /**
         * Get the engine state	
         * @return EEngineState
         */
        TEngineState GetEngineState();

        /**
         * Returns whether the imageconversion is in progress or not	
         */
        TBool IsImageConversionInProgress();

        /**
         * Starts view finding
         * @return void
         */
        void StartViewFinderL();

        /**
         * Stops view finding
         * @return void
         */
        void StopViewFinder();

        /**
         * Provides save and post-exposure images
         * @return void
         */
        void SnapL();

        /**
         * Sets zoom on/off
         * @param aEnable
         * @return TInt, Offset for the zoom indicator bitmap
         */
        TInt SetZoomFactorL( TBool aEnable );
        
        
        /**
        * Sets the autofocus range. 
        * Does nothing if AF is not supported
        * @param aRange, The new focus range
        * @return void
        */
        void SetFocusRangeL( CCamAutoFocus::TAutoFocusRange aRange 
                             = CCamAutoFocus::ERangeNormal );
        
        /**
        * Gets the current autofocus range. 
        * @param aRange, on return, contains the focus range
        * @return void
        */
        void FocusRange( CCamAutoFocus::TAutoFocusRange& aRange );
        
        /**
        * Starts the optimised autofocus operation. 
        * Does nothing if AF is not supported
        * @return void
        */
        void StartFocusL();
        
        /**
        * Cancels an ongoing autofocus operation 
        * @return void
        */
        void FocusCancel();

        /**
         * Converts and saves bitmap to JPEG image
         * @param aQuality 
         * @param aNewFilePathAndName
         * @param aFs 
         * @return void
         */
        void SaveImageL(TJpegQualityFactor aQuality, const TFileName* 
            aNewFilePathAndName, RFs* aFs);

        /**
         * Destructs JPEG encoder
         * @return void
         */
        void DeleteEncoder();

        /**
         * Returns default display mode
         * @return TDisplayMode
         */
        TDisplayMode DisplayMode() const;

        /**
         * Sets Exposure time according to Camera mode
         * @param Camera State
         * @return void 
         */
        void SetMode( TCameraState aMode );
        
        /**
         * Reserves camera
         * @return void
         */
        void ReserveCameraL();

        /**
         * Releases camera
         * @return void
         */
        void ReleaseCamera();

        /**
         * Switches off camera power
         * @return void
         */
        void PowerOff();

        /**
         * Displays error message
         * @param An error
         * @return void
         */
        void HandleError( TInt aError ); 
        
        /**
        * Notify the engine if the client rect size changes
        * @param The new client rect
        */
        void ClientRectChangedL(const TRect& aRect);

    private:
    
        /**
         * Calculates portrait image size from bigger snapped image 
         * keeping the aspect ratio unchanged
         * @return The portrait image size
         */
        TRect Portrait( const CFbsBitmap* aBitmap);
    
        /**
         * Returns camera image format to be used with current display mode
         * @return CCamera::TFormat
         */
        CCamera::TFormat ImageFormat() const;

        /**
         * Returns highest color mode supported by HW
         * @return CCamera::TFormat
         */
        CCamera::TFormat ImageFormatMax() const;

        /**
         * Clips the viewfinding images according to portrait mode size.
         * @param A bitmap to be clipped
         * @return void
         */
        void ClipL(const CFbsBitmap& aFrame);

        /**
         * Draws captured image on the screen, modifies if needed
         * @return void
         */
        void DrawL();

        /**
         * Starts view finding and prepares image capturing
         * @return void
         */
        void DoViewFinderL(); 
        
        /**
         * Returns the index for the requested image size (if supported)
         * @return TInt index of the requested image size
         */
         
        TInt GetImageSizeIndexL(const TSize& aRequestedSize, 
                                const CCamera::TFormat& aFormat);

        /**
         * From MCameraObserver, "CCamera::Reserve()" is completed
         */
        virtual void ReserveComplete(TInt aError);

        /**
         * From MCameraObserver, "CCamera::PowerOn()" is completed	
         */
        virtual void PowerOnComplete(TInt aError);

        /**
         * From MCameraObserver, "CCamera::StartViewFinderBitmapsL()" 
         * is completed
         */
        virtual void ViewFinderFrameReady(CFbsBitmap& aFrame);

        /**
         * From MCameraObserver, "CCamera::CaptureImage()" is completed
         */
        virtual void ImageReady(CFbsBitmap* aBitmap,HBufC8* aData,TInt aError);

        /**
         * From MCameraObserver, CCamera::StartVideoCapture() is completed
         */
        virtual void FrameBufferReady(MFrameBuffer* aFrameBuffer,TInt aError);
        
        /**
         * From MCamAutoFocusObserver, called on completion of CCamAutoFocus::InitL
         */
         virtual void InitComplete( TInt aError );
        
        /**
         * From MCamAutoFocusObserver, called on completion of AttemptOptimisedFocusL
         */
         virtual void OptimisedFocusComplete( TInt aError );
         
         /**
         * Changes the engine state and completes an async request immediately
         */
        void AsyncStateChange(const TEngineState& aNextState);

    private: // Functions from base CActive classes 
        /**
         * From CActive cancels the Active object, empty 
         * @return void
         */
        void DoCancel() ;

        /**
         * From CActive, called when an asynchronous request has completed
         * @return void
         */
        void RunL() ;

    private: //data
     
        CEikonEnv*                iEikEnv;            // Not owned
        CCamera*                  iCamera;
        TDisplayMode              iDisplayMode;
        CCamera::TFormat          iColorDepth;
        CCamera::TFormat          iColorDepthHW;
        CCameraAppController&     iController;
        TCameraInfo               iInfo;
        TInt                      iZoomFactor;
        TBool                     iCapturePrepared; 
        CWsBitmap*                iBitmapPortraitVF; 
        CFbsBitmap*               iBitmapSave;
        HBufC8*                   iImageExif;
        RFile                     iFile;
        CImageEncoder*            iEncoder;
        TBool                     iStart;
        TBool                     iCameraReserved;
        TBool                     iCameraReserveComplete;
        TSize                     iLandscapeSize;
        TSize                     iPortraitSize;
        TSize                     iCaptureSize;
        TCameraState              iMode;
        TBool                     iPowering;
        TEngineState              iState;
        
        CCamAutoFocus*                  iAutoFocus;       
        CCamera::TFormat                iFormat;
        CCamAutoFocus::TAutoFocusRange  iRange;
        
    };

#endif // __CAMERA_CAPTURE_ENGINE_H__