/*

* Copyright (c) 2008-2009 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:   Classes for thumbnail-related tasks.

*

*/

/**

 * @internal reviewed 31/07/2007 by Simon Brooks

 */

#include "glxtnquickthumbnailtask.h"

#include <ExifRead.h>

#include <glxassert.h>

#include <glxtracer.h>

#include <imageconversion.h>

#include "glxtnfileinfo.h"

#include "glxtnfileutility.h"

#include "glxtnimagedecoderfactory.h"

#include "glxtnthumbnailrequest.h"

#include "glxtnvideoutility.h"

#include "mglxtnthumbnailcreatorclient.h"

// All EXIF data is within the first KGlxMaxExifSize bytes of the file

const TInt KGlxMaxExifSize = 0x10000;

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

// NewL

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

//

CGlxtnQuickThumbnailTask* CGlxtnQuickThumbnailTask::NewL(

        const TGlxThumbnailRequest& aRequestInfo,

        CGlxtnFileUtility& aFileUtility, MGlxtnThumbnailCreatorClient& aClient)

    {

    TRACER("CGlxtnQuickThumbnailTask::NewL()");

    CGlxtnQuickThumbnailTask* task = new (ELeave) CGlxtnQuickThumbnailTask(

                                        aRequestInfo, aFileUtility, aClient);

    CleanupStack::PushL(task);

    task->ConstructL(aRequestInfo.iBitmapHandle);

    CleanupStack::Pop( task );

    return task;

    }

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

// Constructor

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

//

CGlxtnQuickThumbnailTask::CGlxtnQuickThumbnailTask(

                                    const TGlxThumbnailRequest& aRequestInfo,

                                    CGlxtnFileUtility& aFileUtility,

                                    MGlxtnThumbnailCreatorClient& aClient ) :

    CGlxtnLoadThumbnailTask( KGlxtnTaskIdQuickThumbnail,

                            aRequestInfo, aFileUtility, aClient ),

    iQuality( EGlxThumbnailQualityLow )

    {

    TRACER("CGlxtnQuickThumbnailTask::CGlxtnQuickThumbnailTask()");

    }

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

// Destructor

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

//

CGlxtnQuickThumbnailTask::~CGlxtnQuickThumbnailTask() 

    {

    TRACER("CGlxtnQuickThumbnailTask::~CGlxtnQuickThumbnailTask()");

    delete iUtility;

    delete iVideoFrame;

    }

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

// DoStartL

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

//

TBool CGlxtnQuickThumbnailTask::DoStartL(TRequestStatus& aStatus)

    {

    TRACER("TBool CGlxtnQuickThumbnailTask::DoStartL()");

    iInfo = new (ELeave) CGlxtnFileInfo;

	Client().FetchFileInfoL(iInfo, ItemId(), &aStatus);

    iState = EStateFetchingUri;

    return ETrue;

    } 

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

// DoCancel

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

//

void CGlxtnQuickThumbnailTask::DoCancel() 

    {

    TRACER("void CGlxtnQuickThumbnailTask::DoCancel()");

    CGlxtnLoadThumbnailTask::DoCancel();

    if ( EStateFetchingUri == iState )

        {

        Client().CancelFetchUri( ItemId() );

        }

    if ( iUtility )

        {

        iUtility->Cancel();

        }

    iFileUtility.ClearBadFileMarker();

    }

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

// DoRunL

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

//

TBool CGlxtnQuickThumbnailTask::DoRunL(TRequestStatus& aStatus) 

    {

    TRACER("TBool CGlxtnQuickThumbnailTask::DoRunL()");

    TInt error = aStatus.Int();

	TBool active = EFalse;

    if ( KErrNone == error )

        {

        switch ( iState )

            {

            case EStateFetchingUri:

                User::LeaveIfNull(iInfo);

                iBadFileMarkerNotNeededFlag = ETrue;

                TBool protectedFile;

                iInfo->IdentifyFileL(iVideo, protectedFile);

                // leave if file is DRM protected and client has no DRM 

                // capablity

                if ( protectedFile && !iDrmAllowed )

                    {

                    User::Leave(KErrAccessDenied);

                    }

                if ( !LoadThumbnailL( aStatus ) )

                    {

                    iBadFileMarkerNotNeededFlag = EFalse;

                    iFileUtility.CheckBadFileListL( iInfo->FilePath() );

                    QuickDecodeL(aStatus);

                    }

                active = ETrue;

                break;

            case EStateLoading:

                iQuality = EGlxThumbnailQualityHigh;

                active = HandleLoadedThumbnailL(aStatus);

                break;

            case EStateDecodingThumbnail:

                // Nothing to do

                break;

            case EStateDecodingImage:

                QuickScaleL();

                break;

            default:

                GLX_ASSERT_ALWAYS( EFalse, Panic( EGlxPanicIllegalState ),

                                "CGlxtnQuickThumbnailTask: Illegal state" );

                break;

            }

        }

    else

        {

        if ( EStateLoading == iState )

            {

            // Loading failed - generate low quality thumbnail instead

            iBadFileMarkerNotNeededFlag = EFalse;

            iFileUtility.CheckBadFileListL( iInfo->FilePath() );

            QuickDecodeL(aStatus);

            active = ETrue;

            }

        }

    if ( !active )

        {

        if ( !iBadFileMarkerNotNeededFlag )

            {

            iFileUtility.ClearBadFileMarker();

            }

        Client().ThumbnailFetchComplete(ItemId(), iQuality, error);

        }

    return active; 

    }

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

// DoRunError

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

//

TBool CGlxtnQuickThumbnailTask::DoRunError(TInt aError)

    {

    TRACER("TBool CGlxtnQuickThumbnailTask::DoRunError(TInt aError)");

    iFileUtility.ClearBadFileMarker();

    Client().ThumbnailFetchComplete(ItemId(), iQuality, aError);

    return EFalse;

    }

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

// QuickDecodeL

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

//

void CGlxtnQuickThumbnailTask::QuickDecodeL(TRequestStatus& aStatus)

    {

    TRACER("void CGlxtnQuickThumbnailTask::QuickDecodeL(TRequestStatus& aStatus)");

    iQuality = EGlxThumbnailQualityLow;

    if ( iVideo )

        {

        RArray<TSize> targetSizes;

        CleanupClosePushL(targetSizes);

        targetSizes.AppendL( TSize(iRequestedSize) );

        iUtility = new (ELeave) CGlxtnVideoUtility;

        iUtility->GetVideoFrameL(&aStatus, iVideoFrame, iInfo->FilePath(), targetSizes, iThumbnail->DisplayMode() );

        iState = EStateDecodingImage;

        CleanupStack::PopAndDestroy(&targetSizes);

        }

    else

        {

        ReadThumbnailL(aStatus);

        }

    }

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

// ReadThumbnailL

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

//

void CGlxtnQuickThumbnailTask::ReadThumbnailL(TRequestStatus& aStatus)

    {

    TRACER("void CGlxtnQuickThumbnailTask::ReadThumbnailL(TRequestStatus& aStatus)");

    TBool scaleBitmap = EFalse;

    TRAPD(error, ReadExifThumbnailL());

    if ( KErrNotFound == error || KErrCorrupt == error

        || KErrNotSupported == error )

        {

        // Use CImageDecoder to get the EXIF thumbnail instead

        iDecoder = GlxtnImageDecoderFactory::NewL(

                                iFileUtility.FsSession(), iInfo->FilePath() );

        TRAPD( error2, iDecoder->SetImageTypeL(

                                    CImageDecoder::EImageTypeThumbnail ) );

        if ( KErrNotFound == error2 )

            {

            // No EXIF thumbnail - load whole image and scale quickly

            scaleBitmap = ETrue;

            }

        else

            {

            User::LeaveIfError( error2 );

            }

        }

    else

        {

        User::LeaveIfError(error);

        iDecoder = GlxtnImageDecoderFactory::NewL(

                                    iFileUtility.FsSession(), *iThumbData );

        }

    DecodeThumbnailL(aStatus, scaleBitmap);

    }

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

// ReadExifThumbnailL

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

//

void CGlxtnQuickThumbnailTask::ReadExifThumbnailL()

    {

    TRACER("void CGlxtnQuickThumbnailTask::ReadExifThumbnailL()");

    __ASSERT_ALWAYS(iInfo, Panic(EGlxPanicNullPointer));

    RFile file;

    CleanupClosePushL(file);

    User::LeaveIfError(file.Open(iFileUtility.FsSession(),

                                    iInfo->FilePath(), EFileRead));

    TInt size;

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

    if ( KGlxMaxExifSize < size )

        {

        size = KGlxMaxExifSize;

        }

    HBufC8* exifData = HBufC8::NewLC(size);

    TPtr8 ptr(exifData->Des());

    User::LeaveIfError(file.Read(ptr));

    CExifRead* exifReader = CExifRead::NewL(*exifData, CExifRead::ENoJpeg);

    CleanupStack::PushL(exifReader);

    delete iThumbData;

    iThumbData = NULL;

    iThumbData = exifReader->GetThumbnailL();

    CleanupStack::PopAndDestroy(exifReader);

    CleanupStack::PopAndDestroy(exifData);

    CleanupStack::PopAndDestroy(&file);

    }

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

// QuickScaleL

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

//

void CGlxtnQuickThumbnailTask::QuickScaleL()

    {

    TRACER("void CGlxtnQuickThumbnailTask::QuickScaleL()");

    User::LeaveIfNull(iVideoFrame);

    TSize frameSize(iVideoFrame->SizeInPixels());

    TSize thumbSize(iRequestedSize);

    // Reduce target thumbSize to same aspect ratio as source image

    if ( thumbSize.iHeight * frameSize.iWidth < thumbSize.iWidth * frameSize.iHeight )

        {

        // Source has taller aspect than target so reduce target width

        thumbSize.iWidth = (thumbSize.iHeight * frameSize.iWidth) / frameSize.iHeight;

        }

    else

        {

        // Source has wider aspect than target so reduce target height

        thumbSize.iHeight = (thumbSize.iWidth * frameSize.iHeight) / frameSize.iWidth;

        }

    // Resize empty bitmap to required size

    User::LeaveIfError( iThumbnail->Resize( thumbSize ) );

    CFbsBitmapDevice* device = CFbsBitmapDevice::NewL( iThumbnail );

    CleanupStack::PushL(device);

    CFbsBitGc* context = NULL;

    User::LeaveIfError(device->CreateContext(context));

    CleanupStack::PushL(context);

    context->DrawBitmap(TRect(thumbSize), iVideoFrame);

    CleanupStack::PopAndDestroy(context); 

    CleanupStack::PopAndDestroy(device);

    }