imagehandlingutilities/thumbnailmanager/plugins/audio/src/thumbnailimagedecoderv3.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 11 Jun 2010 13:58:45 +0300
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permissions -rw-r--r--
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/*
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* Copyright (c) 2006-2007 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:  Image thumbnail decoder
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 *
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*/
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//INCLUDE FILES
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#include <e32base.h>
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#include <imageconversion.h>
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#include <ExifRead.h>
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#include <IclExtJpegApi.h>
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#include "thumbnailimagedecoderv3.h"
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#include "thumbnaillog.h"
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#include "thumbnailpanic.h"
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// CImageDecoder supports up to 1/8 size reduction if EFullyScaleable is
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// not set.
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const TInt KMaximumReductionFactor = 8;
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// ============================ MEMBER FUNCTIONS ===============================
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// ---------------------------------------------------------------------------
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// CThumbnailImageDecoder::CThumbnailImageDecoder()
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// C++ default constructor can NOT contain any code, that might leave.
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// ---------------------------------------------------------------------------
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//
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CThumbnailImageDecoderv3::CThumbnailImageDecoderv3( RFs& aFs ): 
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    CActive(EPriorityStandard ), iBitmap( NULL ), iFs( aFs ), iBuffer( NULL )
0
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    {
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    CActiveScheduler::Add( this );
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    }
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// ---------------------------------------------------------------------------
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// CThumbnailImageDecoderv3::~CThumbnailImageDecoderv3()
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// Destructor.
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// ---------------------------------------------------------------------------
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//
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CThumbnailImageDecoderv3::~CThumbnailImageDecoderv3()
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    {
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    Release();
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    }
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// -----------------------------------------------------------------------------
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// CThumbnailImageDecoderv3::CreateL()
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// Creates thumbnail of image
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// -----------------------------------------------------------------------------
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//
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void CThumbnailImageDecoderv3::CreateL( const TDesC8* aBuffer, MThumbnailProviderObserver&
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    aObserver, const CThumbnailManager::TThumbnailFlags /*aFlags*/, const
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    TDataType& aMimeType, const TSize& aSize )
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    {
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    TN_DEBUG1( "CCThumbnailImageDecoderv3::CreateL() called" );
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    iSize = aSize;
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    iMimeType = aMimeType;
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    iObserver = &aObserver;
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    iBuffer = aBuffer;
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    CreateDecoderL();
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    const TFrameInfo info( iDecoder->FrameInfo());
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    if (( info.iOverallSizeInPixels.iWidth < 1 ) || (
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        info.iOverallSizeInPixels.iHeight < 1 ))
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        {
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        User::Leave( KErrCorrupt );
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        }
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    iFrameInfoFlags = info.iFlags;
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    iOriginalSize = info.iOverallSizeInPixels; 
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    }
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// -----------------------------------------------------------------------------
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// CThumbnailImageDecoderv3::DecodeL()
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// Decode the thumbnail image
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// -----------------------------------------------------------------------------
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//
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void CThumbnailImageDecoderv3::DecodeL( const TDisplayMode aDisplayMode )
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    {
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    TN_DEBUG1( "CThumbnailImageDecoderv3::DecodeL() start" );
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0
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    // Create the bitmap
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    if ( !iBitmap )
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        {
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        iBitmap = new( ELeave )CFbsBitmap();
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        }
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    //Size in both x and y dimension must be non-zero, positive value
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    TSize loadSize( iOriginalSize) ;
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    // If EFullyScaleable flag is not set, we need to figure out a size
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    // reduction factor. 1/1, 1/2, 1/4, and 1/8 are possible values for all
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    // plug-ins. SVG graphics can be rendered at any size even though
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    // EFullyScaleable is not set.
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    if ( !( iFrameInfoFlags& TFrameInfo::EFullyScaleable ) )
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        {
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        loadSize = iOriginalSize;
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        TInt reductionFactor = 1;
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        while ( reductionFactor < KMaximumReductionFactor && ( iSize.iWidth <
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            loadSize.iWidth / 2 ) && ( iSize.iHeight < loadSize.iHeight / 2 ))
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            {
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            // magic: use loadSize that is half of previous size
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            loadSize.iWidth /= 2;
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            loadSize.iHeight /= 2;
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            reductionFactor *= 2;
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            }
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        // If original size is not an exact multiple of reduction factor,
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        // we need to round loadSize up
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        if ( reductionFactor && iOriginalSize.iWidth % reductionFactor )
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            {
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            loadSize.iWidth++;
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            }
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        if ( reductionFactor && iOriginalSize.iHeight % reductionFactor )
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            {
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            loadSize.iHeight++;
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            }
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        TN_DEBUG4( 
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            "EFullyScaleable not set for image - loadSize=(%d,%d) reduction=1/%d ", loadSize.iWidth, loadSize.iHeight, reductionFactor );
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        }
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    TInt err = iBitmap->Create( loadSize, aDisplayMode );
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    if (err != KErrNone)
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        {
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        delete iBitmap;
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        iBitmap = NULL;
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        User::Leave(err);
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        }
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0
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    iDecoder->Convert( &iStatus, * iBitmap );
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0
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    SetActive();
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    TN_DEBUG1( "CThumbnailImageDecoderv3::DecodeL() end" );
0
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    }
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// -----------------------------------------------------------------------------
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// CThumbnailImageDecoderv3::Release()
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// Releases resources
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// -----------------------------------------------------------------------------
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//
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void CThumbnailImageDecoderv3::Release()
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    {
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    Cancel();
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0
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    delete iDecoder;
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    iDecoder = NULL;
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    delete iBitmap;
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    iBitmap = NULL;
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    delete iBuffer; // we own the buffer
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    iBuffer = NULL;
0
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    }
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// -----------------------------------------------------------------------------
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// CThumbnailImageDecoderv3::DoCancel()
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// -----------------------------------------------------------------------------
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//
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void CThumbnailImageDecoderv3::DoCancel()
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    {
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    if ( iDecoder )
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        {
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        iDecoder->Cancel();
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        delete iDecoder;
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        iDecoder = NULL;
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        }
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    delete iBitmap;
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    iBitmap = NULL;
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    delete iBuffer; // we own the buffer
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    iBuffer = NULL;
0
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    }
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// -----------------------------------------------------------------------------
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// CThumbnailImageDecoderv3::RunL()
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// -----------------------------------------------------------------------------
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//
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void CThumbnailImageDecoderv3::RunL()
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    {
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    // This call takes ownership of iBitmap
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    iObserver->ThumbnailProviderReady( iStatus.Int(), iBitmap, iOriginalSize, EFalse, EFalse );
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    iBitmap = NULL; // owned by server now
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    delete iBuffer; // we own the buffer
0
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    iBuffer = NULL;
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0
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    Release();
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    }
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// -----------------------------------------------------------------------------
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// CThumbnailImageDecoderv3::CreateDecoderL
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// Creates image decoder
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// -----------------------------------------------------------------------------
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//
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void CThumbnailImageDecoderv3::CreateDecoderL()
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    {
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    delete iDecoder;
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    iDecoder = NULL;
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    CImageDecoder::TOptions options = ( CImageDecoder::TOptions )( 
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            CImageDecoder::EOptionNoDither | CImageDecoder::EPreferFastDecode | CImageDecoder::EOptionAlwaysThread );
0
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    TRAPD( decErr, iDecoder = CExtJpegDecoder::DataNewL(
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            CExtJpegDecoder::EHwImplementation, iFs, *iBuffer, options ));
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    if ( decErr != KErrNone )
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        {
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        TN_DEBUG2( "CThumbnailImageDecoderv3::CreateDecoderL() - HW CExtJpegDecoder failed %d", decErr);
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        LeaveIfCorruptL( decErr );
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   230
        
0
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        TRAP( decErr, iDecoder = CExtJpegDecoder::DataNewL(
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                CExtJpegDecoder::ESwImplementation, iFs, *iBuffer, options ));
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        if ( decErr != KErrNone )
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            {                             
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            TN_DEBUG2( "CThumbnailImageDecoderv3::CreateDecoderL() - SW CExtJpegDecoder failed %d", decErr);
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            LeaveIfCorruptL( decErr );
0
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            // don't force any mime type
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            TRAPD( decErr, iDecoder = CImageDecoder::DataNewL( iFs, *iBuffer, options ) );
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            if ( decErr != KErrNone )
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                {
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                delete iBuffer;
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                iBuffer = NULL;
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                TN_DEBUG2( "CThumbnailImageDecoderv3::CreateDecoderL() - CImageDecoder error %d", decErr );
0
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                User::Leave( decErr );
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                }     
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            TN_DEBUG1( "CThumbnailImageDecoderv3::CreateDecoderL() - CImageDecoder created" );
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            }
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        else
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            {
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            TN_DEBUG1( "CThumbnailImageDecoderv3::CreateDecoderL() - SW CExtJpegDecoder created" );
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            }               
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        }
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    else
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        {
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        TN_DEBUG1( "CThumbnailImageDecoderv3::CreateDecoderL() - HW CExtJpegDecoder created" );
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        }    
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    }
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// -----------------------------------------------------------------------------
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// CThumbnailImageDecoderv3::CreateExifDecoderL()
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// Returns size of original image
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// -----------------------------------------------------------------------------
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//
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const TSize& CThumbnailImageDecoderv3::OriginalSize()const
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    {
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    return iOriginalSize;
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    }
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// -----------------------------------------------------------------------------
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// CThumbnailImageDecoder3::LeaveIfCorruptL()
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// Leave is image is corrupted
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// -----------------------------------------------------------------------------
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//
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void CThumbnailImageDecoderv3::LeaveIfCorruptL(const TInt aError )
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    {
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    //no sense to try other codecs if image is corrupted
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    if( aError == KErrCorrupt || aError == KErrUnderflow)
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        {
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        User::Leave( aError );
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        }
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    }
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0
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//End of file