/*

* 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 <e32math.h>

#include <iclextjpegapi.h>

#include "thumbnailimagedecoder.h"

#include "thumbnaillog.h"

#include "thumbnailpanic.h"

const TUid KImageTypeSVGUid = 

    {

    0x102073E7

};

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

// not set.

const TInt KMaximumReductionFactor = 8;

// Matchers for recognizing JPEG files

_LIT( KJpegMime, "image/jpeg" );

// Matcher for recognizing SVG files

_LIT( KSvgMime, "image/svg+xml" );

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

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

// CThumbnailImageDecoder::CThumbnailImageDecoder()

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

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

//

CThumbnailImageDecoder::CThumbnailImageDecoder( RFs& aFs ): CActive(

    EPriorityStandard ), iFs( aFs )

    {

    CActiveScheduler::Add( this );

    }

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

// CThumbnailImageDecoder::~CThumbnailImageDecoder()

// Destructor.

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

//

CThumbnailImageDecoder::~CThumbnailImageDecoder()

    {

    Release();

    }

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

// CThumbnailImageDecoder::CreateL()

// Creates thumbnail of image

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

//

void CThumbnailImageDecoder::CreateL( RFile64& aFile, MThumbnailProviderObserver&

    aObserver, const CThumbnailManager::TThumbnailQualityPreference aQualityPreference, const

    TDataType& aMimeType, const TSize& aSize)

    {

    TN_DEBUG1( "CThumbnailImageDecoder::CreateL() start" );

    iBuffer = NULL;

    iSize = aSize;

    iMimeType = aMimeType;

    iObserver = &aObserver;

    iFile = aFile;

    CreateDecoderL( aQualityPreference );

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

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

        info.iOverallSizeInPixels.iHeight < 1 ))

        {

        User::Leave( KErrCorrupt );

        }

    iFrameInfoFlags = info.iFlags;

    iOriginalSize = info.iOverallSizeInPixels;

    TN_DEBUG1( "CThumbnailImageDecoder::CreateL() end" );

    }

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

// CThumbnailImageDecoder::CreateL()

// Creates thumbnail of image

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

//

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

    aObserver, const CThumbnailManager::TThumbnailQualityPreference aQualityPreference, const

    TDataType& aMimeType, const TSize& aSize)

    {

    TN_DEBUG1( "CThumbnailImageDecoder::CreateL() start" );

    iSize = aSize;

    iMimeType = aMimeType;

    iObserver = &aObserver;

    iBuffer = aBuffer;

    CreateDecoderL( aQualityPreference );

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

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

        info.iOverallSizeInPixels.iHeight < 1 ))

        {

        User::Leave( KErrCorrupt );

        }

    iFrameInfoFlags = info.iFlags;

    iOriginalSize = info.iOverallSizeInPixels;

    TN_DEBUG1( "CThumbnailImageDecoder::CreateL() end" );

    }

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

// CThumbnailImageDecoder::DecodeL()

// Decode the thumbnail image

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

//

void CThumbnailImageDecoder::DecodeL( const TDisplayMode aDisplayMode, const CThumbnailManager::TThumbnailFlags aFlags)

    {

    TN_DEBUG1( "CThumbnailImageDecoder::DecodeL() start" );

    // Create the bitmap

    if ( !iBitmap )

        {

        iBitmap = new( ELeave )CFbsBitmap();

        }

    TN_DEBUG3( "CThumbnailImageDecoder::DecodeL() %d x %d", iSize.iWidth, iSize.iHeight );

    if( iOriginalSize.iWidth < iOriginalSize.iHeight )

        {

        TInt height = iSize.iHeight;

        iSize.iHeight = iSize.iWidth;

        iSize.iWidth = height;

        iPortrait = ETrue;

        TN_DEBUG3( "CThumbnailImageDecoder::DecodeL() %d x %d", iSize.iWidth, iSize.iHeight );

        }

    else

        {

        iPortrait = EFalse;

        }

    TN_DEBUG3( "CThumbnailImageDecoder::DecodeL() iOriginalSize = %d x %d", iOriginalSize.iWidth, iOriginalSize.iHeight );

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

    TSize loadSize( iOriginalSize) ;

    if(iOriginalSize.iHeight < iSize.iHeight || iOriginalSize.iWidth < iSize.iWidth )

        {

        loadSize = iOriginalSize;

        TN_DEBUG1( "CThumbnailImageDecoder::DecodeL() LoadSize is OriginalSize" );

        }

    else if((iFrameInfoFlags& TFrameInfo::EFullyScaleable || IsSvg()) && aFlags == !CThumbnailManager::ECropToAspectRatio)

        {

        loadSize = iSize;

        TN_DEBUG1( "CThumbnailImageDecoder::DecodeL() EFullyScaleable start" );

        const TReal32 srcAspect = static_cast < TReal32 > (

              iOriginalSize.iWidth ) / iOriginalSize.iHeight;

          // set loadsize to maximum size within target size 

          if ( (loadSize.iHeight * srcAspect) <= loadSize.iWidth )

              {

              TReal trg = 0;

              TReal src( loadSize.iHeight * srcAspect );

              Math::Round( trg, src, 0 );

              loadSize.SetSize( trg, loadSize.iHeight );

              }

          else

              {

              TReal trg;

              TReal src( loadSize.iWidth / srcAspect );

              Math::Round( trg, src, 0 );

              loadSize.SetSize( loadSize.iWidth, trg );

              }

        TN_DEBUG3( "CThumbnailImageDecoder::DecodeL() EFullyScaleable loadSize = %d x %d", loadSize.iWidth, loadSize.iHeight );

        }

    else 

        {

        // 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.

        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( 

            "CThumbnailImageDecoder::DecodeL() - 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();

    TN_DEBUG1( "CThumbnailImageDecoder::DecodeL() end" );

    }

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

// CThumbnailImageDecoder::Release()

// Releases resources

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

//

void CThumbnailImageDecoder::Release()

    {

    Cancel();

    delete iJpegReadBuffer;

    iJpegReadBuffer = NULL;

    delete iExifThumbImage;

    iExifThumbImage = NULL;

    delete iDecoder;

    iDecoder = NULL;

    }

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

// CThumbnailImageDecoder::DoCancel()

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

//

void CThumbnailImageDecoder::DoCancel()

    {

    if ( iDecoder )

        {

        iDecoder->Cancel();

        delete iJpegReadBuffer;

        iJpegReadBuffer = NULL;

        delete iExifThumbImage;

        iExifThumbImage = NULL;

        delete iDecoder;

        iDecoder = NULL;

        }

    }

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

// CThumbnailImageDecoder::RunL()

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

//

void CThumbnailImageDecoder::RunL()

    {

    // This call takes ownership of iBitmap

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

    iBitmap = NULL; // owned by server now

    Release();

    }

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

// CThumbnailImageDecoder::IsJpeg()

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

//

TBool CThumbnailImageDecoder::IsJpeg()

    {

    __ASSERT_DEBUG(( iMimeType.Des() != KNullDesC ), ThumbnailPanic(

        EThumbnailEmptyDescriptor ));

    if ( KJpegMime() == iMimeType.Des())

        {

        return ETrue;

        }

    return EFalse;

    }

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

// CThumbnailImageDecoder::IsSvg()

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

//

TBool CThumbnailImageDecoder::IsSvg()

    {

    __ASSERT_DEBUG(( iMimeType.Des() != KNullDesC ), ThumbnailPanic(

        EThumbnailEmptyDescriptor ));

    if ( KSvgMime() == iMimeType.Des())

        {

        return ETrue;

        }

    return EFalse;

    }

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

// CThumbnailImageDecoder::CreateDecoderL

// Creates image decoder

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

//

void CThumbnailImageDecoder::CreateDecoderL( CThumbnailManager::TThumbnailQualityPreference

    aFlags )

    {

    TN_DEBUG1( "CThumbnailImageDecoder::CreateDecoderL() start" );

    TBool thumbFound( EFalse );

    // If the image is in jpeg format, try to get thumbnail from EXIF data (if EOptimizeForQuality not set)

    if ( IsJpeg() && !( aFlags == CThumbnailManager::EOptimizeForQuality ))

        {

        TN_DEBUG1( "CThumbnailImageDecoder::CreateDecoderL() crete exif decoder" );

        TRAPD( err, CreateExifDecoderL( aFlags ));

        thumbFound = ( err == KErrNone );

        iEXIF = ETrue;

        }

    if ( !thumbFound )

        {

        iEXIF = EFalse;

        TN_DEBUG1( "CThumbnailImageDecoder::CreateDecoderL() crete normal decoder" );

        delete iDecoder;

        iDecoder = NULL;

        TFileName fullName;

        if ( !iBuffer )

            {

            iFile.FullName( fullName );

            }

        CImageDecoder::TOptions options;

        if ( aFlags == CThumbnailManager::EOptimizeForQuality )

            {

            options = ( CImageDecoder::TOptions )( CImageDecoder

                ::EOptionNoDither );

            }

        else

            {

            options = ( CImageDecoder::TOptions )( CImageDecoder

                ::EOptionNoDither | CImageDecoder::EPreferFastDecode );

            }

        if ( IsSvg())

            {

            if ( !iBuffer )

                {

                iDecoder = CImageDecoder::FileNewL( iFile, ContentAccess::EPeek, 

                        options, KImageTypeSVGUid, KNullUid, KNullUid );

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

                }

            else

                {

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

                if ( decErr != KErrNone )

                    {

                    TN_DEBUG1( "CThumbnailImageDecoder::CreateDecoderL() - error 1" );

                    User::Leave( decErr );

                    }

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

                }

            }

        else if ( !IsJpeg())

            {

            if ( !iBuffer )

                {

                iDecoder = CImageDecoder::FileNewL( iFile, ContentAccess::EPeek, options );

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

                }

            else

                {

                TRAPD( decErr, iDecoder = CImageDecoder::DataNewL( iFs, *iBuffer, iMimeType.Des8(), options) );

                if ( decErr != KErrNone )

                    {                        

                    // don't force any mime type

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

                    if ( decErr != KErrNone )

                        {                        

                        TN_DEBUG1( "CThumbnailImageDecoder::CreateDecoderL() - error 2" );

                        User::Leave( decErr );

                        }

                    }

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

                }

            }

        else

            {

            if ( !iBuffer )

                {

                TRAPD( decErr, iDecoder = CExtJpegDecoder::FileNewL(

                        CExtJpegDecoder::EHwImplementation, iFs, fullName, options) );

                if ( decErr != KErrNone )

                    {

                    TRAP( decErr, iDecoder = CExtJpegDecoder::FileNewL(

                            CExtJpegDecoder::ESwImplementation, iFs, fullName, options) );

                    if ( decErr != KErrNone )

                        {

                        iDecoder = CImageDecoder::FileNewL( iFile, ContentAccess::EPeek, options );

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

                        }

                    else

                        {

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

                        }

                    }

                else 

                    {

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

                    }

                }

            else

                {

                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 )

                        {                        

                        TRAPD( decErr, iDecoder = CImageDecoder::DataNewL( iFs, *iBuffer, iMimeType.Des8(), options) );

                        if ( decErr != KErrNone )

                            {                        

                            // don't force any mime type

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

                            if ( decErr != KErrNone )

                                {                                

                                TN_DEBUG1( "CThumbnailImageDecoder::CreateDecoderL() - error 3" );

                                User::Leave( decErr );

                                }

                            }

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

                        }

                    else

                        {

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

                        }               

                    }

                else

                    {

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

                    }               

                }

            }

        }

    TN_DEBUG1( "CThumbnailImageDecoder::CreateDecoderL() end" );

    }

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

// CThumbnailImageDecoder::CreateExifDecoderL()

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

//

void CThumbnailImageDecoder::CreateExifDecoderL( CThumbnailManager

    ::TThumbnailQualityPreference aFlags )

    {

    TN_DEBUG1( "CThumbnailImageDecoder::CreateExifDecoderL() start" );

    // If the image is in jpeg format, try to get thumbnail from EXIF data.

    CExifRead* reader = NULL;

    if ( !iBuffer )

        {    

        TInt64 size( 0 );

        User::LeaveIfError( iFile.Size( size ));

        TInt readSize = Min( size, KJpegLoadBufferSize );

        delete iJpegReadBuffer;

        iJpegReadBuffer = NULL;

        iJpegReadBuffer = HBufC8::NewL( readSize );

        TPtr8 localBuffer = iJpegReadBuffer->Des();

        User::LeaveIfError( iFile.Read( localBuffer, readSize ));

        reader = CExifRead::NewL( localBuffer, CExifRead::ENoJpeg );

        }

    else

        {

        reader = CExifRead::NewL( *iBuffer, CExifRead::ENoJpeg );

        }