/*

* Copyright (c) 2007 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:  Implementation of Camera image decoder

*

*/

#include <imageconversion.h>

#include <ExifRead.h>

#include <ecam.h> // MCameraBuffer

#include <eikenv.h>

#include "camlogging.h"

#include "camfilesaveutility.h"

#include "cambuffershare.h"

#include "camimagedecoder.h"

// ===========================================================================

// Local constants

namespace NCamCameraController

  {

  // Decoding flags

  static const TUint32 KConversionOptions = 

    ( CImageDecoder::EOptionNone

    | CImageDecoder::EOptionAlwaysThread

    | CImageDecoder::EPreferFastDecode

    );

  // EXIF reader flags

  //   Only need the thumbnail, so no need to parse the

  //   main (jpeg) image.

  static const TUint KExifReaderFlags = CExifRead::ENoJpeg;

  // Other constants

  static const TInt KMaxRetries = 10;

  static const TInt KPriority = CActive::EPriorityHigh;

  }

using namespace NCamCameraController;

// ===========================================================================

// public constructor and destructor

CCamImageDecoder* 

CCamImageDecoder::NewL( MCamImageDecoderObserver& aObserver )

  {

  CCamImageDecoder* self = 

      new (ELeave) CCamImageDecoder( aObserver );

  CleanupStack::PushL( self );

  self->ConstructL();

  CleanupStack::Pop( self );

  return self;  

  }

CCamImageDecoder::~CCamImageDecoder()

  {

  PRINT( _L("Camera => ~CCamImageDecoder") );

  Cancel();

  delete iDecoder;

  SetImageData( NULL );

 if(iDecodedBitmap)

  	{

  	delete iDecodedBitmap;

  	iDecodedBitmap = NULL;

  	}

  iFs.Close();

  PRINT( _L("Camera <= ~CCamImageDecoder") );

  }

// ===========================================================================

// public methods

void

CCamImageDecoder::StartConversionL( CCamBufferShare* aBuffer )

  {

  PRINT( _L("Camera => CCamImageDecoder::StartConversionL") );

  // Data for CImageDecoder must be available throughout the conversion.

  // Need to stop any outstanding operation before deleting the descriptor.

  Cancel();

  PRINT( _L("Camera <> CCamImageDecoder: Copying image data..") );

  SetImageData( aBuffer );

  // GetImageDataL leaves if no data available.

  TDesC8* imageData = GetImageDataL();

  PRINT( _L("Camera <> CCamImageDecoder: Creating decoder..") );

  delete iDecoder;

  iDecoder = NULL;

  iDecoder = CImageDecoder::DataNewL( iFs, *imageData, (CImageDecoder::TOptions)KConversionOptions );

  if( iDecoder->FrameCount() > 0 )

    {

    const TFrameInfo& info( iDecoder->FrameInfo() );

#ifdef _DEBUG   

    TSize size = info.iOverallSizeInPixels;

    PRINT2( _L("Camera <> CCamImageDecoder: Bmp size(%d,%d)"), size.iWidth, size.iHeight );

    PRINT1( _L("Camera <> CCamImageDecoder: Bmp dispmode(%d)"), info.iFrameDisplayMode );

#endif

    PRINT( _L("Camera <> CCamImageDecoder: Create bitmap for snapshot..") );

    if( !iDecodedBitmap ) iDecodedBitmap = new (ELeave) CFbsBitmap;

    else                  iDecodedBitmap->Reset();

    TInt createError = iDecodedBitmap->Create( info.iOverallSizeInPixels, 

                                               info.iFrameDisplayMode );

    if( KErrNone != createError )

      {

      delete iDecodedBitmap;

      iDecodedBitmap = NULL;

      User::Leave( createError );

      }

    PRINT( _L("Camera <> CCamImageDecoder: start conversion..") );

    iRetryCounter = 0;

    iDecoder->Convert( &iStatus, *iDecodedBitmap, 0 );

    SetActive();

    }

  else

    {

    PRINT( _L("Camera <> CCamImageDecoder: No frame provided, leave..") );

    User::Leave( KErrNotFound );    

    }

  PRINT( _L("Camera <= CCamImageDecoder::StartConversionL") );

  }

// ---------------------------------------------------------------------------

// ---------------------------------------------------------------------------

//

TDesC8*

CCamImageDecoder::GetImageDataL()

  {

  PRINT( _L("Camera => CCamImageDecoder::GetImageDataL") );

  if( !iSharedImageData ||

      !iSharedImageData->SharedBuffer() )

    {

    User::Leave( KErrNotFound );

    }

  TDesC8* data = iSharedImageData->SharedBuffer()->DataL( 0 );

  if( !data )

    User::Leave( KErrNotFound );

  delete iThumbnailData;

  iThumbnailData = ReadExifThumbNail( *data ); // Returns NULL on errors

#ifdef CAMERAAPP_CREATE_TESTIMAGE

  TRAPD( saveStatus1, SaveImageDataToFileL( *data, _L("testimagefull.jpg") ) );

  PRINT1( _L("Camera <> CCamImageDecoder: Save full image to file status:%d"), saveStatus1 );

  if( iThumbnailData )

    {

    TRAPD( saveStatus2, SaveImageDataToFileL( *iThumbnailData, _L("testimagethumb.jpg") ) );

    PRINT1( _L("Camera <> CCamImageDecoder: Save thumbnail to file status:%d"), saveStatus2 );

    }

#endif

  if( iThumbnailData )

    {

    data = iThumbnailData;

    }  

  PRINT1( _L("Camera <= CCamImageDecoder::GetImageDataL, data size:%d"), data->Size() );

  return data;

  }

// ---------------------------------------------------------------------------

// ---------------------------------------------------------------------------

//

HBufC8*

CCamImageDecoder::ReadExifThumbNail( const TDesC8& aExifData )

  {

  PRINT( _L("Camera => CCamImageDecoder::ReadExifThumbNailL") );

  HBufC8* thumb = NULL;

  TRAP_IGNORE( 

    {

    CExifRead* reader = CExifRead::NewL( aExifData, KExifReaderFlags );

    CleanupStack::PushL( reader );

    thumb = reader->GetThumbnailL();

    CleanupStack::PopAndDestroy( reader );

    });

  PRINT( _L("Camera <= CCamImageDecoder::ReadExifThumbNailL") );

  return thumb;

  }

// ===========================================================================

// from CActive

// ---------------------------------------------------------------------------

// virtual 

// ---------------------------------------------------------------------------

//

void 

CCamImageDecoder::DoCancel()

  {

  PRINT( _L("Camera => CCamImageDecoder::DoCancel") );

  if( iDecoder )

    {

    iDecoder->Cancel();

    delete iDecoder;

    iDecoder = NULL;    

    }

  SetImageData( NULL );

  PRINT( _L("Camera <= CCamImageDecoder::DoCancel") );

  }

// ---------------------------------------------------------------------------

// virtual 

// ---------------------------------------------------------------------------

//

void 

CCamImageDecoder::RunL()

  {

  PRINT1( _L("Camera => CCamImageDecoder::RunL, iStatus:%d"), iStatus.Int() );

  switch( iStatus.Int() )

    {

    case KErrNone :

      {

      // CImageDecoder has finished using the data,

      // so we are able to free it.

      SetImageData( NULL );

      iObserver.ImageDecoded( iStatus.Int(), iDecodedBitmap );

      break;

      }

    case KErrUnderflow :

      {

      // Decoder did not have enough data to convert.

      // CImageDecoder documentation recommends calling

      // repeatedly ContinueConvert.

      if( iRetryCounter++ < KMaxRetries )

        {

        iStatus = KErrNone;

        iDecoder->ContinueConvert( &iStatus );

        SetActive();

        }

      else

        {

        // Handled in RunError

        User::Leave( KErrUnderflow );

        }

      break;

      }

    case KErrCancel :

    default :

      {

      User::Leave( iStatus.Int() );

      break;

      }

    }

  PRINT( _L("Camera <= CCamImageDecoder::RunL") );

  }

// ---------------------------------------------------------------------------

// virtual 

// ---------------------------------------------------------------------------

//

TInt 

CCamImageDecoder::RunError( TInt aError )

  {

  PRINT1( _L("Camera => CCamImageDecoder::RunError(%d)"), aError );

  SetImageData( NULL );

  // Leave has occurred in RunL.

  // Notify observer with error.

  iObserver.ImageDecoded( aError, NULL );

  PRINT( _L("Camera <= CCamImageDecoder::RunError") );

  return KErrNone;

  }

// ===========================================================================

void

CCamImageDecoder::SetImageData( CCamBufferShare* aBuffer )

  {

  if( iSharedImageData )

    {

    iSharedImageData->Release();

    iSharedImageData = NULL;

    }

  iSharedImageData = aBuffer;

  if( iSharedImageData )

    iSharedImageData->Reserve();

  }

// ===========================================================================

// private constructors

void

CCamImageDecoder::ConstructL()

  {

  User::LeaveIfError( iFs.Connect() );

  CActiveScheduler::Add( this );

  }

CCamImageDecoder::CCamImageDecoder( MCamImageDecoderObserver& aObserver )

  : CActive( KPriority  ),

    iObserver( aObserver )

  {

  }

// end of file