/*

* Copyright (c) 2004-2008 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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 "config.h"

#include <e32std.h> 

#include "SyncDecodeThread.h"

#include "MaskedBitmap.h"

namespace TBidirectionalState {

    class TRunInfo;

};

#define KMaxHeapSize 0x1000000

class BmElem 

{

    public:

        TPtrC8 iData;

        TThreadId iParentThreadId;

        TRequestStatus* iRequestStatus;

        TInt iBitmapHandle;

        TInt iMaskHandle;

};

enum DecoderState {ENewDecodeRequest, EDecodeInProgress, EDecoderIdle};

class CSynDecoder : public CActive

    {

    public:  // Constructors and destructor

        static CSynDecoder* NewL();

        virtual ~CSynDecoder();

    public:

        void Open(const TDesC8& aData, TRequestStatus *status);

        void Lock() { iDecoderLock.Wait(); }

        void Release() { iDecoderLock.Signal(); }

    private: // From base class CActive

        void DoCancel();

        void RunL();

        TInt RunError( TInt aError );

        void SignalParent( TInt aError );

        void StartDecodeL();        

        void SetIdle();

    private: // Private constructors

        CSynDecoder();

        void ConstructL();

    private: // Data

        BmElem iElem;

        CImageDecoder* iDecoder;

        CMaskedBitmap* iBitmap;

        RFastLock iDecoderLock;

        DecoderState iDecodeState;

        RThread syncThread;

friend class CSynDecodeThread;        

    };

// FORWARD DECLARATIONS

CSynDecoder *CSynDecodeThread::iSyncDecoder = NULL;

// ============================= LOCAL FUNCTIONS ===============================

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

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

//

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

// might leave.

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

CSynDecoder::CSynDecoder() : CActive(CActive::EPriorityHigh)

    {

    CActiveScheduler::Add( this );

    }

void CSynDecoder::ConstructL()

{

    User::LeaveIfError(iDecoderLock.CreateLocal());

    SetIdle();

}

CSynDecoder* CSynDecoder::NewL()

    {

    CSynDecoder* self = new (ELeave) CSynDecoder();

    CleanupStack::PushL( self );

    self->ConstructL( );

    CleanupStack::Pop(); // self

    return self;

    }

CSynDecoder::~CSynDecoder()

    {

    Cancel();

    delete iDecoder;

    delete iBitmap;

    iDecoderLock.Close();

    }

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

// Decode - Decode request submitted from client thread

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

void CSynDecoder::Open(const TDesC8& aData, TRequestStatus *status)

{

    iElem.iRequestStatus = status;

    iElem.iData.Set(aData); 

    iElem.iParentThreadId = RThread().Id();

    iElem.iBitmapHandle = 0;

    iElem.iMaskHandle = 0;    

    iDecodeState = ENewDecodeRequest;

}

void CSynDecoder::SetIdle()

{

    iDecodeState = EDecoderIdle;

    if(!IsActive()) {

        iStatus = KRequestPending;

        SetActive();

    }

}

void CSynDecoder::StartDecodeL()

{

    if(iDecoder) {

        delete iDecoder;

        iDecoder = NULL;

    }

    if(iBitmap) {

        delete iBitmap;

        iBitmap = NULL;

    }

    iDecoder = CImageDecoder::DataNewL(CEikonEnv::Static()->FsSession(), iElem.iData);

    iBitmap = CMaskedBitmap::NewL();

    TFrameInfo frameInfo = iDecoder->FrameInfo( 0 );

    TInt err = KErrNone;

    if( frameInfo.iFlags & TFrameInfo::ETransparencyPossible ) {

        TDisplayMode maskmode = (frameInfo.iFlags & TFrameInfo::EAlphaChannel) ? EGray256 : EGray2;

        err = iBitmap->Create( frameInfo.iOverallSizeInPixels, EColor64K, maskmode );

    }

    else

        err = iBitmap->Create( frameInfo.iOverallSizeInPixels, EColor64K );

    User::LeaveIfError(err);

    // start decoding

    CFbsBitmap& dstBitmap = iBitmap->BitmapModifyable();

    CFbsBitmap& dstMask = iBitmap->MaskModifyable();    

    if( ( frameInfo.iFlags & TFrameInfo::ETransparencyPossible ) && dstMask.Handle() )

        iDecoder->Convert( &iStatus, dstBitmap, dstMask, 0 );

    else {

        dstMask.Reset();

        iDecoder->Convert( &iStatus, dstBitmap, 0 );

    }

    iDecodeState = EDecodeInProgress;

    SetActive();

}

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

// CSynDecoder::DoCancel

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

void CSynDecoder::DoCancel()

{

    iDecoder->Cancel();

    SignalParent( KErrCancel );

    SetIdle();

}

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

// CSynDecoder::RunL

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

void CSynDecoder::RunL()

{    

    switch(iDecodeState)

    {

    case ENewDecodeRequest:

        StartDecodeL(); // start async decode

        break;

    case EDecodeInProgress:

        if( iStatus.Int() == KErrNone ) {

            iElem.iBitmapHandle = iBitmap->Bitmap().Handle();

            iElem.iMaskHandle = iBitmap->Mask().Handle();        

        }

        SignalParent(iStatus.Int());

        SetIdle();

        break;

    default:

        SetIdle();

    }        

}

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

// CSynDecoder::RunError

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

TInt CSynDecoder::RunError(TInt aError)

{

    SignalParent(aError);

    SetIdle();

    return KErrNone;

}

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

// CSynDecoder::RunError

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

void CSynDecoder::SignalParent(TInt aError)

{

    RThread parent;

    parent.Open(iElem.iParentThreadId);

    parent.RequestComplete(iElem.iRequestStatus, aError );

    parent.Close();

}

CSynDecodeThread* CSynDecodeThread::NewL()

{

    CSynDecodeThread* self = new (ELeave) CSynDecodeThread();

    CleanupStack::PushL(self);

    self->ConstructL();

    CleanupStack::Pop(self);

    return self;

}

CSynDecodeThread::CSynDecodeThread()

{

}

CSynDecodeThread::~CSynDecodeThread()

{

    CActiveScheduler::Stop(); 

	iDecoderThread.Close();

}

void CSynDecodeThread::ConstructL()

{   

    _LIT(KThreadName, "ImgDecoder");

    RAllocator &allocator = User::Allocator();

    User::LeaveIfError(iDecoderThread.Create(KThreadName, CSynDecodeThread::ScaleInThread, KDefaultStackSize, &allocator, NULL));

    iDecoderThread.SetPriority(EPriorityMore);

    TRequestStatus status = KRequestPending;

    iDecoderThread.Rendezvous(status);

    iDecoderThread.Resume();

    User::WaitForRequest(status);

    User::LeaveIfError(status.Int());

}

TInt CSynDecodeThread::Decode(const TDesC8& aData)

{

    iSyncDecoder->Lock();

    //notify decoder thread about new request

    TRequestStatus status = KRequestPending;

    iSyncDecoder->Open(aData, &status);

    TRequestStatus *ps = &(iSyncDecoder->iStatus);

    iDecoderThread.RequestComplete(ps, KErrNone);

    //wait for decode complete

    User::WaitForRequest(status);    

    iSyncDecoder->Release();

    return status.Int();    

}

void CSynDecodeThread::Handle(TInt& aBitmapHandle, TInt& aMaskHandle)

{

    aBitmapHandle = iSyncDecoder->iElem.iBitmapHandle;

    aMaskHandle = iSyncDecoder->iElem.iMaskHandle;    

}

TInt CSynDecodeThread::ScaleInThread(TAny *aPtr)

{

    CTrapCleanup* cleanup = CTrapCleanup::New();

    CActiveScheduler* as = new CActiveScheduler;

    CActiveScheduler::Install(as);  

    RFbsSession fbs;

    fbs.Connect();

    // start event loop

    TRAPD(err, iSyncDecoder = CSynDecoder::NewL());

    if (err == KErrNone) {

        // wait for decode request from client threads

        RThread().Rendezvous(KErrNone);

        CActiveScheduler::Start();

    }

    else {

        RThread().Rendezvous(err);

    }

    // thread shutdown 

    delete as;

    delete iSyncDecoder; 

    delete cleanup; 

    fbs.Disconnect();       

    return err;

}