/*

* Copyright (c) 2006-2007 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:  Image thumbnail decoder

 *

*/

//INCLUDE FILES

#include <e32base.h>

#include <imageconversion.h>

#include <exifread.h>

#include <iclextjpegapi.h>

#include "thumbnailimagedecoderv3.h"

#include "thumbnaillog.h"

#include "thumbnailpanic.h"

// CImageDecoder supports up to 1/8 size reduction if EFullyScaleable is

// not set.

const TInt KMaximumReductionFactor = 8;

// ============================ MEMBER FUNCTIONS ===============================

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

// CThumbnailImageDecoder::CThumbnailImageDecoder()

// C++ default constructor can NOT contain any code, that might leave.

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

//

CThumbnailImageDecoderv3::CThumbnailImageDecoderv3( RFs& aFs ): CActive(

    EPriorityStandard ), iFs( aFs )

    {

    CActiveScheduler::Add( this );

    }

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

// CThumbnailImageDecoderv3::~CThumbnailImageDecoderv3()

// Destructor.

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

//

CThumbnailImageDecoderv3::~CThumbnailImageDecoderv3()

    {

    Release();

    }

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

// CThumbnailImageDecoderv3::CreateL()

// Creates thumbnail of image

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

//

void CThumbnailImageDecoderv3::CreateL( const TDesC8* aBuffer, MThumbnailProviderObserver&

    aObserver, const CThumbnailManager::TThumbnailFlags /*aFlags*/, const

    TDataType& aMimeType, const TSize& aSize )

    {

    TN_DEBUG1( "CCThumbnailImageDecoderv3::CreateL() called" );

    iSize = aSize;

    iMimeType = aMimeType;

    iObserver = &aObserver;

    iBuffer = aBuffer;

    CreateDecoderL();

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

    if (( info.iOverallSizeInPixels.iWidth < 1 ) || (

        info.iOverallSizeInPixels.iHeight < 1 ))

        {

        User::Leave( KErrCorrupt );

        }

    iFrameInfoFlags = info.iFlags;

    iOriginalSize = info.iOverallSizeInPixels; 

    }

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

// CThumbnailImageDecoderv3::DecodeL()

// Decode the thumbnail image

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

//

void CThumbnailImageDecoderv3::DecodeL( const TDisplayMode aDisplayMode )

    {

    // Create the bitmap

    if ( !iBitmap )

        {

        iBitmap = new( ELeave )CFbsBitmap();

        }

    //Size in both x and y dimension must be non-zero, positive value

    TSize loadSize( iOriginalSize) ;

    // If EFullyScaleable flag is not set, we need to figure out a size

    // reduction factor. 1/1, 1/2, 1/4, and 1/8 are possible values for all

    // plug-ins. SVG graphics can be rendered at any size even though

    // EFullyScaleable is not set.

    if ( !( iFrameInfoFlags& TFrameInfo::EFullyScaleable ) )

        {

        loadSize = iOriginalSize;

        TInt reductionFactor = 1;

        while ( reductionFactor < KMaximumReductionFactor && ( iSize.iWidth <

            loadSize.iWidth / 2 ) && ( iSize.iHeight < loadSize.iHeight / 2 ))

            {

            // magic: use loadSize that is half of previous size

            loadSize.iWidth /= 2;

            loadSize.iHeight /= 2;

            reductionFactor *= 2;

            }

        // If original size is not an exact multiple of reduction factor,

        // we need to round loadSize up

        if ( reductionFactor && iOriginalSize.iWidth % reductionFactor )

            {

            loadSize.iWidth++;

            }

        if ( reductionFactor && iOriginalSize.iHeight % reductionFactor )

            {

            loadSize.iHeight++;

            }

        TN_DEBUG4( 

            "EFullyScaleable not set for image - loadSize=(%d,%d) reduction=1/%d ", loadSize.iWidth, loadSize.iHeight, reductionFactor );

        }

    User::LeaveIfError( iBitmap->Create( loadSize, aDisplayMode ));

    iDecoder->Convert( &iStatus, * iBitmap );

    while ( iStatus == KErrUnderflow )

        {

        iDecoder->ContinueConvert( &iStatus );

        }

    SetActive();

    }

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

// CThumbnailImageDecoderv3::Release()

// Releases resources

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

//

void CThumbnailImageDecoderv3::Release()

    {

    Cancel();

    delete iDecoder;

    iDecoder = NULL;

    }

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

// CThumbnailImageDecoderv3::DoCancel()

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

//

void CThumbnailImageDecoderv3::DoCancel()

    {

    if ( iDecoder )

        {

        iDecoder->Cancel();

        delete iDecoder;

        iDecoder = NULL;

        }

    }

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

// CThumbnailImageDecoderv3::RunL()

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

//

void CThumbnailImageDecoderv3::RunL()

    {

    // This call takes ownership of iBitmap

    iObserver->ThumbnailProviderReady( iStatus.Int(), iBitmap, iOriginalSize, EFalse, EFalse );

    iBitmap = NULL; // owned by server now

    delete iBuffer;

    iBuffer = NULL;

    Release();

    }

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

// CThumbnailImageDecoderv3::CreateDecoderL

// Creates image decoder

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

//

void CThumbnailImageDecoderv3::CreateDecoderL()

    {

    delete iDecoder;

    iDecoder = NULL;

    CImageDecoder::TOptions options = ( CImageDecoder::TOptions )( 

    TRAPD( decErr, iDecoder = CExtJpegDecoder::DataNewL(

            CExtJpegDecoder::EHwImplementation, iFs, *iBuffer, options ));

    if ( decErr != KErrNone )

        {

        TRAP( decErr, iDecoder = CExtJpegDecoder::DataNewL(

                CExtJpegDecoder::ESwImplementation, iFs, *iBuffer, options ));

        if ( decErr != KErrNone )

            // don't force any mime type

            TRAPD( decErr, iDecoder = CImageDecoder::DataNewL( iFs, *iBuffer, options ) );

            if ( decErr != KErrNone )

                {

                delete iBuffer;

                iBuffer = NULL;

                User::Leave( decErr );

                }     

            TN_DEBUG1( "CThumbnailImageDecoderv3::CreateDecoderL() - CImageDecoder created" );

            }

        else

            {

            TN_DEBUG1( "CThumbnailImageDecoderv3::CreateDecoderL() - SW CExtJpegDecoder created" );

            }               

        }

    else

        {

        TN_DEBUG1( "CThumbnailImageDecoderv3::CreateDecoderL() - HW CExtJpegDecoder created" );

        }    

    }

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

// CThumbnailImageDecoderv3::CreateExifDecoderL()

// Returns size of original image

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

//

const TSize& CThumbnailImageDecoderv3::OriginalSize()const

    {

    return iOriginalSize;

    }

//End of file