/*

* Copyright (c) 2005-2007 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: 

*

*

*/

#include "CPbk2ThumbnailScaler.h"

#include <bitmaptransforms.h>

#include <applayout.cdl.h>

#include <AknUtils.h>

// Sizes for different original images from LAF

#define KVgaSize        TSize(640, 480)

#define KVgaTurnedSize  TSize(480, 640)

#define KCifSize        TSize(352, 288)

#define KCifTurnedSize  TSize(288, 352)

#define KCommSize       TSize(80,  96)

const TReal KTallThumbnailRatio = 0.625;

const TReal KWideThumbnailRatio = 1.467;

CPbk2ThumbnailScaler* CPbk2ThumbnailScaler::NewL

        (MPbk2ThumbnailScalerObserver& aObserver)

    {

    return new(ELeave) CPbk2ThumbnailScaler(aObserver);

    }

CPbk2ThumbnailScaler::CPbk2ThumbnailScaler

        (MPbk2ThumbnailScalerObserver& aObserver) :

    CActive(CActive::EPriorityStandard),

    iObserver(aObserver)

    {

    CActiveScheduler::Add(this);

    }

CPbk2ThumbnailScaler::~CPbk2ThumbnailScaler()

    {

    Cancel();

    delete iScaler;

    delete iBitmap;

    }

void CPbk2ThumbnailScaler::DoCropL(CFbsBitmap* aBitmap)

    {

    TSize size = aBitmap->SizeInPixels();

    TReal ratio = TReal(size.iWidth) / TReal(size.iHeight);

    TSize targetSize;

    if (ratio < KTallThumbnailRatio)

        {

        targetSize.SetSize

            (size.iWidth, TInt(size.iWidth / KTallThumbnailRatio));

        }

    else if (ratio > KWideThumbnailRatio)

        {

        targetSize.SetSize

            (TInt(size.iHeight * KWideThumbnailRatio), size.iHeight);

        }

    else

        {

        // no cropping needed

        return;

        }

    TRect targetRect(TPoint((size.iWidth - targetSize.iWidth) / 2,

                            (size.iHeight - targetSize.iHeight) / 2),

                     targetSize);

    CFbsBitmap* target = new(ELeave) CFbsBitmap;

    CleanupStack::PushL(target);

    User::LeaveIfError(target->Create(targetSize, aBitmap->DisplayMode()));

    HBufC8* scanLine = HBufC8::NewLC(aBitmap->ScanLineLength

        (targetSize.iWidth, aBitmap->DisplayMode()));

    TPtr8 scanLinePtr = scanLine->Des();

    TPoint startPoint(targetRect.iTl.iX, targetRect.iTl.iY);

    TInt targetY = 0;

    for (; startPoint.iY < targetRect.iBr.iY; ++startPoint.iY)

        {

        aBitmap->GetScanLine(scanLinePtr, startPoint, targetSize.iWidth, aBitmap->DisplayMode());

        target->SetScanLine(scanLinePtr, targetY++);

        }

    aBitmap->Reset();

    User::LeaveIfError(aBitmap->Duplicate(target->Handle()));

    CleanupStack::PopAndDestroy(2, target); // scanLine, target

    }

void CPbk2ThumbnailScaler::StartScaleL(CFbsBitmap* aBitmap, const TSize& aSize)

    {

    // Crops the image if needed

    DoCropL(aBitmap);

    if (!iScaler)

        {

        iScaler = CBitmapScaler::NewL();

        }

    iBitmap = aBitmap;

    iScaler->Scale(&iStatus, *iBitmap, aSize);

    SetActive();

    }

void CPbk2ThumbnailScaler::CreateThumbnail(CFbsBitmap* aBitmap)

    {

    Cancel();

    TSize size = aBitmap->SizeInPixels();

    TReal ratio = TReal(size.iWidth) / TReal(size.iHeight);

    TSize targetSize;

    TRect zeroRect(0, 0, 0, 0);

    if (size == KVgaSize)

        {

        TAknLayoutRect layoutRect;

        layoutRect.LayoutRect(zeroRect, AppLayout::VGA());

        targetSize = TSize(layoutRect.Rect().Width(), layoutRect.Rect().Height());

        }

    else if (size == KVgaTurnedSize)

        {

        TAknLayoutRect layoutRect;

        layoutRect.LayoutRect(zeroRect, AppLayout::VGA_turned_90());

        targetSize = TSize(layoutRect.Rect().Width(), layoutRect.Rect().Height());

        }

    else if (size == KCifSize)

        {

        TAknLayoutRect layoutRect;

        layoutRect.LayoutRect(zeroRect, AppLayout::CIF());

        targetSize = TSize(layoutRect.Rect().Width(), layoutRect.Rect().Height());

        }

    else if (size == KCifTurnedSize)

        {

        TAknLayoutRect layoutRect;

        layoutRect.LayoutRect(zeroRect, AppLayout::CIF_turned_90());

        targetSize = TSize(layoutRect.Rect().Width(), layoutRect.Rect().Height());

        }

    else if (size == KCommSize)

        {

        TAknLayoutRect layoutRect;

        layoutRect.LayoutRect(zeroRect, AppLayout::Communicator_personal_image());

        targetSize = TSize(layoutRect.Rect().Width(), layoutRect.Rect().Height());

        }

    else if (ratio < KTallThumbnailRatio)

        {

        TAknLayoutRect layoutRect;

        layoutRect.LayoutRect(zeroRect, AppLayout::Image_aspect_ratio___0_625());

        targetSize = TSize(layoutRect.Rect().Width(), layoutRect.Rect().Height());

        }

    else if (ratio > KWideThumbnailRatio)

        {

        TAknLayoutRect layoutRect;

        layoutRect.LayoutRect(zeroRect, AppLayout::Image_aspect_ratio___1_467());

        targetSize = TSize(layoutRect.Rect().Width(), layoutRect.Rect().Height());

        }

    else // KTallThumbnailRatio < ratio < KWideThumbnailRatio

        {

        TAknLayoutRect layoutRect;

        layoutRect.LayoutRect(zeroRect, AppLayout::_0_625___image_aspect_ratio___1_467());

        targetSize = TSize(layoutRect.Rect().Width(), layoutRect.Rect().Height());

        }

    TRAPD(err, StartScaleL(aBitmap, targetSize));

    if (err != KErrNone)

        {

        iObserver.ThumbnailScalingComplete(err, aBitmap);

        }

    }

void CPbk2ThumbnailScaler::RunL()

    {

    TInt status = iStatus.Int();

    iObserver.ThumbnailScalingComplete(status, iBitmap);

    iBitmap = NULL;

    }

void CPbk2ThumbnailScaler::DoCancel()

    {

    iScaler->Cancel();

    iObserver.ThumbnailScalingComplete(KErrCancel, iBitmap);

    iBitmap = NULL;

    }

TInt CPbk2ThumbnailScaler::RunError(TInt aError)

    {

    iObserver.ThumbnailScalingComplete(aError, iBitmap);

    iBitmap = NULL;

    return KErrNone;

    }

// End of File