/*

* 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:  

*       Unified Message Editor - Combined image scaler & compressor

*

*/

// INCLUDE FILES

#include "msgunieditorimageprocessor.h"

#include <imageconversion.h>

#include <bitmaptransforms.h>

#include <MsgMimeTypes.h>

// ==========================================================

// EXTERNAL DATA STRUCTURES

// EXTERNAL FUNCTION PROTOTYPES

// CONSTANTS

// MACROS

// LOCAL CONSTANTS AND MACROS

// JPEG quality factor related constants:

const TInt KHighQualityMaxWidth = 640;

const TInt KHighQualityMaxHeight = 480;

const TInt KJpegQualityFactorHigh = 80;

const TInt KJpegQualityFactorNormal = 65;

// MPix factor is relative to this value

// 3MPix: Initial  factor 2/3 * Qfactor calculated above

// 5MPix: 2/5*

// 8MPix: 2/8*

const TReal  KQFMPixfactor( 1600*1200 );

// Count of compressing/scaling efforts

const TInt  KIterationCount( 3 );

const TInt KMPixfactorMin = 1;

const TInt KMPixfactorMax = 5;

const TInt KMPixSizeDivider = 4;

// When compressing next QFactor is QFactor * (value from table) / 100

const TInt KPercentCoefficientsCounts[KMPixfactorMax][KIterationCount] = 

        {  { 60, 30, 10 },

           { 40, 15, 3 },

           { 25, 10, 2 },

           { 12, 4,  0 },

           { 5, 2,  0 }

        };

// MODULE DATA STRUCTURES

// LOCAL FUNCTION PROTOTYPES

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

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

// CUniImageProcessor::CUniImageProcessor

//

// Constructor.

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

//

EXPORT_C CUniImageProcessor::CUniImageProcessor( MUniImageProcessorCallback* aCallback ) : 

    CActive( EPriorityStandard ),

    iCallback( aCallback ),

    iMPixFactor ( KMPixfactorMin )

    {

    CActiveScheduler::Add( this );

    }

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

// CUniImageProcessor::~CUniImageProcessor

//

// Destructor

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

//

CUniImageProcessor::~CUniImageProcessor()

    {

    Cancel();

    Reset();

    }

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

// CUniImageProcessor::ProcessImageL

//

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

//

EXPORT_C void CUniImageProcessor::ProcessImageL(

    RFile& aSourceFile,

    RFile& aDestFile,

    TSize& aTargetSize,

    const TDesC8& aTargetType,

    TBool aAspectRatio,

    TInt aTargetFileSize )

    {

    if ( iDecoder || iScaler || iEncoder )

        {

        User::Leave( KErrInUse );

        }

    iError = KErrNone;

    iFlags &= ~ECompressOnly;

    if ( aTargetType.CompareF( KMsgMimeImageJpeg ) == 0 )

        {

        iCompressTriesLeft = KIterationCount;

        User::LeaveIfError( aSourceFile.Size( iOriginalFileSize ) );

        // Make sure the resulting image won't be larger than the original

        if ( !aTargetFileSize || iOriginalFileSize < aTargetFileSize )

            {

            aTargetFileSize = iOriginalFileSize;

            iFlags |= EImplicitCompress;

            }

        iTargetFileSize = aTargetFileSize;

        }

    else

        {

        iCompressTriesLeft = 0;

        iTargetFileSize = 0;

        iOriginalFileSize = 0;

        }

    iQFactorCalculated = EFalse;

    iMPixFactor = KMPixfactorMin;

    iDestFile = &aDestFile;

    iAspectRatio = aAspectRatio;

    iDecoder = CImageDecoder::FileNewL( aSourceFile, ContentAccess::EPeek );

    iEncoder = CImageEncoder::FileNewL( aDestFile, aTargetType );

    const TFrameInfo& frameInfo = iDecoder->FrameInfo();

    TSize decodeSize( frameInfo.iOverallSizeInPixels );

    if ( !CalculateDecodeAndTargetSizes( aTargetSize, decodeSize, aAspectRatio ) )

        {

        // use bitmap plane scale

        iScaler = CBitmapScaler::NewL();

        iSourceBitmap = new ( ELeave ) CFbsBitmap;

        iFlags |= ESourceBitmapOwned;

        User::LeaveIfError( iSourceBitmap->Create(

            decodeSize,

            frameInfo.iFrameDisplayMode ) );

        }

    iDestBitmap = new ( ELeave ) CFbsBitmap;

    iFlags |= EDestBitmapOwned;

    User::LeaveIfError( iDestBitmap->Create(

        aTargetSize,

        frameInfo.iFrameDisplayMode ) );

    CreateImageDataL( aTargetType, aTargetSize );

    DecodeImage();

    }

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

// CUniImageProcessor::ProcessImageL

//

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

//

EXPORT_C void CUniImageProcessor::ScaleImageL(

    CFbsBitmap* aSourceBitmap,

    RFile& aDestFile,

    const TSize& aTargetSize,

    const TDesC8& aTargetType,

    TBool aAspectRatio )

    {

    if ( iDecoder || iScaler || iEncoder )

        {

        User::Leave( KErrInUse );

        }

    iError = KErrNone;

    iFlags &= ~ECompressOnly;

    iCompressTriesLeft = 0;

    iTargetFileSize = 0;

    iOriginalFileSize = 0;

    iQFactorCalculated = EFalse;

    iMPixFactor = KMPixfactorMin;

    iDestFile = &aDestFile;

    iAspectRatio = aAspectRatio;

    iScaler = CBitmapScaler::NewL();

    iEncoder = CImageEncoder::FileNewL( aDestFile, aTargetType );

    iSourceBitmap = aSourceBitmap;

    iDestBitmap = new ( ELeave ) CFbsBitmap;

    iFlags |= EDestBitmapOwned;

    TInt error = iDestBitmap->Create(

        aTargetSize,

        iSourceBitmap->DisplayMode() );

    User::LeaveIfError( error );

    CreateImageDataL( aTargetType, aTargetSize );

    ScaleImage( EFalse );

    }

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

// CUniImageProcessor::ScaleImageL

//

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

//

EXPORT_C void CUniImageProcessor::ScaleImageL(

    CFbsBitmap* aSourceBitmap,

    CFbsBitmap* aDestBitmap,

    TBool aAspectRatio )

    {

    if ( iDecoder || iScaler || iEncoder )

        {

        User::Leave( KErrInUse );

        }

    iError = KErrNone;

    iFlags &= ~ECompressOnly;

    iCompressTriesLeft = 0;

    iTargetFileSize = 0;

    iOriginalFileSize = 0;

    iAspectRatio = aAspectRatio;

    iScaler = CBitmapScaler::NewL();

    iSourceBitmap = aSourceBitmap;

    iDestBitmap = aDestBitmap;

    ScaleImage( EFalse );

    }

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

// CUniImageProcessor::ScaleImageL

//

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

//

EXPORT_C void CUniImageProcessor::ScaleImageL(

    RFile& aSourceFile,

    CFbsBitmap*& aDestBitmap,

    CFbsBitmap*& aDestMask,

    TSize& aTargetSize,

    TBool aAspectRatio )

    {

    if ( iDecoder || iScaler || iEncoder )

        {

        User::Leave( KErrInUse );

        }

    iError = KErrNone;

    iFlags &= ~ECompressOnly;

    iCompressTriesLeft = 0;

    iTargetFileSize = 0;

    iOriginalFileSize = 0;

    iQFactorCalculated = EFalse;

    iMPixFactor = KMPixfactorMin;

    iAspectRatio = aAspectRatio;

    iDecoder = CImageDecoder::FileNewL( aSourceFile, ContentAccess::EPeek );

    const TFrameInfo& frameInfo = iDecoder->FrameInfo();

    TSize decodeSize( frameInfo.iOverallSizeInPixels );

    TBool optimum = CalculateDecodeAndTargetSizes( aTargetSize, decodeSize, aAspectRatio );

    // Make sure "compress only flag is not set".

    iFlags &= ~ECompressOnly;

    if ( !optimum )

        {

        // use bitmap plane scale

        iScaler = CBitmapScaler::NewL();

        iSourceBitmap = new ( ELeave ) CFbsBitmap;

        iFlags |= ESourceBitmapOwned;

        User::LeaveIfError( iSourceBitmap->Create(

            decodeSize,

            frameInfo.iFrameDisplayMode ) );

        }

    iDestBitmap = new ( ELeave ) CFbsBitmap;

    iFlags |= EDestBitmapOwned;

    User::LeaveIfError( iDestBitmap->Create(

        aTargetSize,

        frameInfo.iFrameDisplayMode ) );

    if ( frameInfo.iFlags & TFrameInfo::ETransparencyPossible )

        {

        if ( !optimum )

            {

            iSourceMask = new ( ELeave ) CFbsBitmap;

            iFlags |= ESourceMaskOwned;

            User::LeaveIfError( iSourceMask->Create(

                decodeSize,

                frameInfo.iFlags & TFrameInfo::EAlphaChannel ? EGray256 : EGray2 ) );

            }

        iDestMask = new ( ELeave ) CFbsBitmap;

        iFlags |= EDestMaskOwned;

        User::LeaveIfError( iDestMask->Create(

            aTargetSize,

            frameInfo.iFlags & TFrameInfo::EAlphaChannel ? EGray256 : EGray2 ) );

        delete aDestMask; // just in case

        aDestMask = iDestMask;

        }

    else

        {

        delete aDestMask; // just in case

        aDestMask = NULL;

        }

    delete aDestBitmap; //just in case

    aDestBitmap = iDestBitmap;

    iFlags &= ~EDestBitmapOwned;

    iFlags &= ~EDestMaskOwned;

    DecodeImage();

    }

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

// CUniImageProcessor::CalculateDecodeAndTargetSizes

//

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

//

TBool CUniImageProcessor::CalculateDecodeAndTargetSizes(

        TSize& aTargetSize,

        TSize& aDecodeSize,

        TBool aAspectRatio )

    {

    const TFrameInfo& frameInfo = iDecoder->FrameInfo();

    aDecodeSize = frameInfo.iOverallSizeInPixels;

    if ( aTargetSize.iWidth >= aDecodeSize.iWidth &&

         aTargetSize.iHeight >= aDecodeSize.iHeight &&

         !( iFlags & EAllowScalingUp ) )

        {

        // No need to scale at all!

        iFlags |= ECompressOnly;

        aTargetSize = aDecodeSize;

        return ETrue;

        }

    if ( aTargetSize == aDecodeSize )

        {

        // No need to scale at all!

        iFlags |= ECompressOnly;

        return ETrue;

        }

    if ( aAspectRatio )

        {

        // Adjust target size if aspect ratio needs to be maintained.

        TReal scaleRatio = CalculateScaleRatio( aTargetSize, aDecodeSize );

        aTargetSize.iHeight = scaleRatio * aDecodeSize.iHeight;

        aTargetSize.iWidth = scaleRatio * aDecodeSize.iWidth;

        }

    // Width or height should never be zero.

    aTargetSize.iWidth = Max(aTargetSize.iWidth, 1);

    aTargetSize.iHeight = Max(aTargetSize.iHeight, 1);

    TInt wRatio = aDecodeSize.iWidth / aTargetSize.iWidth;

    TInt hRatio = aDecodeSize.iHeight / aTargetSize.iHeight;

    TBool decodeOnly( frameInfo.iFlags & TFrameInfo::EFullyScaleable );

    if ( !decodeOnly &&

        !( aDecodeSize.iWidth % aTargetSize.iWidth ||

           aDecodeSize.iHeight % aTargetSize.iHeight ||

           wRatio != hRatio ||

          (wRatio != 2 && wRatio != 4 && wRatio != 8) ||

          (hRatio != 2 && hRatio != 4 && hRatio != 8) ) )

        {

        decodeOnly = ETrue;

        }

    if ( decodeOnly )

        {

        // Decoding directly to requested target size.

        aDecodeSize = aTargetSize;

        }

    else

        {

        TInt decodeFactor = 8;

        while ( decodeFactor > 1 )

            {

            if ( aDecodeSize.iWidth / decodeFactor >= aTargetSize.iWidth &&

                aDecodeSize.iHeight / decodeFactor >= aTargetSize.iHeight )

                {

                // Smallest 1/2^n factor that creates image larger than target size

                break;

                }

            decodeFactor /= 2;

            }

        if ( ( iFlags & EOnlyDecodeTimeScaling ) && decodeFactor < 8 )

            {

            // Largest 1/2^n factor that creates image smaller than target size

            decodeFactor *= 2;

            decodeOnly = ETrue;

            }

        aDecodeSize.iWidth = ( aDecodeSize.iWidth + decodeFactor - 1 ) / decodeFactor;

        aDecodeSize.iHeight = ( aDecodeSize.iHeight + decodeFactor - 1 ) / decodeFactor;

        if ( decodeOnly )

            {

            // Decoding to target size. Make sure target & decode sizes match.

            // Target size may need to be changed was iOnlyDecodeTimeScaling is used.

            aTargetSize = aDecodeSize;

            }

        }

    return decodeOnly;

    }

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

// CUniImageProcessor::DecodeImage

//

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

//

void CUniImageProcessor::DecodeImage()

    {

    iStatus = KRequestPending;

    if ( iScaler )

        {

        if ( iSourceMask )

            {

            iDecoder->Convert( &iStatus, *iSourceBitmap, *iSourceMask );

            }

        else

            {

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

            }

        }

    else

        {

        if ( iDestMask )

            {

            iDecoder->Convert( &iStatus, *iDestBitmap, *iDestMask );

            }

        else

            {

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

            }

        }

    SetActive();

    }

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

// CUniImageProcessor::ScaleImage

//

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

//

void CUniImageProcessor::ScaleImage( TBool aMask )

    {

    iStatus = KRequestPending;

    if ( aMask )

        {

        iScaler->Scale( &iStatus, *iSourceMask, *iDestMask, iAspectRatio );

        }

    else

        {

        iScaler->Scale( &iStatus, *iSourceBitmap, *iDestBitmap, iAspectRatio );

        }

    SetActive();

    }

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

// CUniImageProcessor::EncodeImageL

//

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

//

void CUniImageProcessor::EncodeImageL( TBool aCompressing )

    {

    if ( aCompressing )

        {

        delete iEncoder;

        iEncoder = NULL;

        // Make sure that the file is empty.

        User::LeaveIfError( iDestFile->SetSize( 0 ) );

        iEncoder = CImageEncoder::FileNewL( *iDestFile, KMsgMimeImageJpeg );

        }

    iCompressTriesLeft--;

    iStatus = KRequestPending;

    iEncoder->Convert( &iStatus, *iDestBitmap, iFrameImageData );

    SetActive();

    }

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

// CUniImageProcessor::DoCancel

//

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

//

void CUniImageProcessor::DoCancel()

    {

    if ( iDecoder )

        {

        iDecoder->Cancel();

        }

    if ( iScaler )

        {

        iScaler->Cancel();

        }

    if ( iEncoder )

        {