/*

*

*

*

*/

/*

 *  This class is wrapped by a proxy CAnimationDecoder

 *  

 *  We needed to wrap animation decoding in a proxy because sometimes the cache gets cleared when decoding

 *  is in progress; when that happens the animation gets deleted while it's in the middle (which causes all sorts

 *  of crashes and memory stomping).  Now, the cache can delete the proxy while the animation is decoding; the proxy

 *  will pass on the delete request to the decoder which will cleanup (delete itself) when it's safe to do so.

 *  

 */

// INCLUDE FILES

#include "config.h"

#include "AnimationDecoderWrapped.h"

#include "MaskedBitmap.h"

#include "ImageObserver.h"

#include "SyncDecodeThread.h"

#include "Oma2Agent.h"

using namespace ContentAccess;

namespace TBidirectionalState {

    class TRunInfo;

};

#include <eikenv.h>

// constants

// Private namespace for constants and functions

namespace

  {

  // Panic function

  void Panic( TInt aPanicCode ) { User::Panic( _L("AnimationDecoder"), aPanicCode ); }

  }

using namespace WebCore;

CSynDecodeThread *CAnimationDecoderWrapped::iSyncDecodeThread  = NULL;

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

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

//

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

// might leave.

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

CAnimationDecoderWrapped::CAnimationDecoderWrapped( ImageObserver* aObs )

    :CActive( CActive::EPriorityIdle )

    , iObserver(aObs)

    , iLoopCount( -1 )

    , iCurLoopCount( -1 )

    , iSyncBitmapHandle(-1)

    , iSyncMaskHandle(-1)

    , iDecodeInProgress(ETrue)

    , iIsInvalid(EFalse)

    , iCanBeDeleted(ETrue)

{

    if (CActiveScheduler::Current())

        CActiveScheduler::Add( this );    

}

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

//

// Two-phased constructor.

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

CAnimationDecoderWrapped* CAnimationDecoderWrapped::NewL( ImageObserver* aObs )

{

    CAnimationDecoderWrapped* self = new (ELeave) CAnimationDecoderWrapped( aObs );

    CleanupStack::PushL( self );

    self->ConstructL( );

    CleanupStack::Pop(); // self

    return self;

}

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

//

// Symbian constructor can leave.

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

void CAnimationDecoderWrapped::ConstructL( )

  {

  }

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

// Destructor

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

CAnimationDecoderWrapped::~CAnimationDecoderWrapped()

{

    Cancel();

    if( iDecoder ) {

        // animated images still being decoded.

        iDecoder->Cancel();

        delete iDecoder, iDecoder = NULL;

    }

    delete iAnimationBitmap, iAnimationBitmap = NULL;

    delete iDestination, iDestination = NULL;

    if(iDrmContent) 

    {

        delete iDrmContent;

        iDrmContent = NULL;

    }

}

/**

 * Invalidate

 * 

 * Mark the object invalid (to be deleted); used when it gets cleared from the cache

 */

void CAnimationDecoderWrapped::Invalidate()

{

    iIsInvalid = ETrue;

    if (iCanBeDeleted)

        delete this;

}

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

// OpenAndDecodeSyncL

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

void CAnimationDecoderWrapped::OpenAndDecodeSyncL( const TDesC8& aData )

{    

    iSizeAvailable = EFalse;

    iRawDataComplete = ETrue;

    delete iDestination;

    iDestination = NULL;

    if(!iSyncDecodeThread) { // first time, create decoder thread

        iSyncDecodeThread = CSynDecodeThread::NewL();

    }

    if (iSyncDecodeThread->Decode(aData) == KErrNone) {

        iSyncDecodeThread->Handle(iSyncBitmapHandle, iSyncMaskHandle); 

        Destination(); // duplicate bitmap handles

        iSizeAvailable = ETrue;

    }        

}

CMaskedBitmap* CAnimationDecoderWrapped::Destination() 

{ 

    if (iDestination) {

        return iDestination; 

    }

    if (iSyncBitmapHandle != -1 && iSyncMaskHandle != -1) {

        CFbsBitmap* bitmap = new CFbsBitmap();

        bitmap->Duplicate(iSyncBitmapHandle);

        CFbsBitmap* mask = new CFbsBitmap();

        mask->Duplicate(iSyncMaskHandle);

        iDestination = new CMaskedBitmap(bitmap, mask);

        iDestination->SetFrameIndex(0);

        iDestination->SetFrameDelay(0);

        iSyncBitmapHandle = -1;

        iSyncMaskHandle = -1;

    }

    return iDestination;

}

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

// DecodeDRMImageContentL : Function for handling the DRM image content

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

HBufC8* CAnimationDecoderWrapped::DecodeDRMImageContentL(const TDesC8& aData)

{

    // input buffers for image conversion

    HBufC8* bufInput = HBufC8::NewLC( aData.Length() + 1 );

    TPtr8 ptrInput = bufInput->Des();

    //Reader intends to view content

    ptrInput.Append( EView );

    ptrInput.Append( aData );

    // output buffer for image conversion

    HBufC8* animatedDRMdata = HBufC8::NewLC( aData.Length() + 256 );

    TPtr8 ptrOutput = animatedDRMdata->Des();

  //Find DRM agent

    TAgent agentDRM;

    RArray<ContentAccess::TAgent> agents;

    ContentAccess::CManager* manager = CManager::NewLC();

    manager->ListAgentsL( agents );

    for ( TInt i = 0; i < agents.Count(); i++ )

      {

    if ( agents[i].Name().Compare( KOmaDrm2AgentName ) == 0)

      {

       agentDRM = agents[i];

       //convert the DRM image

       manager->AgentSpecificCommand( agentDRM, EDecryptOma1DcfBuffer, ptrInput,ptrOutput);

       break;

      }

    }

    CleanupStack::PopAndDestroy(manager);

    //keep animatedDRMdata to return

    CleanupStack::Pop(animatedDRMdata);

    CleanupStack::PopAndDestroy(bufInput);

    return animatedDRMdata;

    }

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

// OpenL

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

void CAnimationDecoderWrapped::OpenL( const TDesC8& aData, TDesC* aMIMEType, TBool aIsComplete )

{

    iCanBeDeleted = EFalse;

    if(!iObserver) {

        OpenAndDecodeSyncL(aData);

        iCanBeDeleted = ETrue;

        if (iIsInvalid)

            delete this;

        return;

    }

    delete iDestination;

    iDestination = NULL;

    iDestination = CMaskedBitmap::NewL();

    HBufC8* mime = 0;

    TPtrC8 buffer(aData.Ptr(),aData.Length());

    if (aMIMEType) {

        // it is safer to ignore the server supplied mime type and just recognize

        // the image type from the data headers. this does not work for all formats though

        if ( *aMIMEType==KMimeWBMP || *aMIMEType==KMimeOTA || *aMIMEType==KMimeWMF){

            // convert to 8 bit

            mime = HBufC8::NewLC(aMIMEType->Length());

            mime->Des().Copy(*aMIMEType);

        }

        if( *aMIMEType==KMimeDRM )

        {

        iDrmContent = DecodeDRMImageContentL(aData);

        TInt drmContentLength = iDrmContent->Des().Length();

        buffer.Set( (const TUint8*)iDrmContent->Des().Ptr(), drmContentLength);

        }

    }

    if( !iDecoder )

        iDecoder = CBufferedImageDecoder::NewL(CEikonEnv::Static()->FsSession());

    if (mime){

        if (iDecoder) {

            iDecoder->OpenL(buffer,*mime,CImageDecoder::EOptionNone);

            CleanupStack::PopAndDestroy(); // mime

        }

    }

    else {

        if (iDecoder) {

            iDecoder->OpenL(buffer,CImageDecoder::EOptionNone);

        }

    }

    iRawDataComplete = aIsComplete;

    if(iDecoder && iDecoder->ValidDecoder()  && iDecoder->IsImageHeaderProcessingComplete()) {

        StartDecodingL();

    }

    else {

        // remove me when incremental image rendering gets supported

        iCanBeDeleted = ETrue;

        if (iIsInvalid)

            delete this;

        User::Leave( KErrCorrupt );

    }

    //If it is an animated image, let's figure out loop count

    if(IsAnimation()) {

        // first see if have a netscape 2.0 extension header 

        const TUint8 extString[] = { 'N', 'E', 'T', 'S', 'C', 'A', 'P','E','2','.','0','\3','\1' };

        const TInt sizeofextString = sizeof(extString);

        TPtrC8 rawDataPtr((TUint8*)aData.Ptr(), aData.Length());

        TInt offset = rawDataPtr.Find(extString, sizeofextString);

        if(offset != KErrNotFound) {

            // found a header, get the loop count -

            // (the loop count is in the 2 bytes following the header string listed above,

            // stored low byte then high byte)

            iLoopCount = (TInt16)((rawDataPtr[offset+sizeofextString+1] * 256) + rawDataPtr[offset+sizeofextString]);

            if(iLoopCount != 0) {

                ++iLoopCount;  // +1 to make it 1 based rather than 0 based 

            }

            else{

            // 0 indicates infinite - map to internal loop count infinite value 

                iLoopCount = -1;

            }

        }

        else {

            // no header found, assume 1x thru loop 

            iLoopCount = 1;

        }

        iCurLoopCount = iLoopCount;

    }

    iCanBeDeleted = ETrue;

    if (iIsInvalid)

        delete this;

}

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

// CAnimationDecoderWrapped::AddDataL

// New chunk of raw data

//

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

//

void CAnimationDecoderWrapped::AddDataL(

    const TDesC8& aNextChunk,

    TBool aIsComplete )

{

    iRawDataComplete = aIsComplete;

    if( iDecoder ) {

        iDecoder->AppendDataL(aNextChunk);

        if( iDecoder->ValidDecoder() ) {

            //  if the image conversion is busy , then just appending the

            // data should be sufficient

            if(iStatus == KRequestPending) {

                // more image data

                iDecoder->ContinueConvert( &iStatus );

                SetActive();

            }

        }

        else {

            iDecoder->ContinueOpenL() ;

            if(iDecoder->ValidDecoder()  && iDecoder->IsImageHeaderProcessingComplete()){

                StartDecodingL();

            }

        }

    }

}

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

// CImageLoader::StartDecodingL

//

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

//

void CAnimationDecoderWrapped::StartDecodingL()

{

    // Check frame count

    iAnimationFrameCount = iDecoder->FrameCount();

    iAnimation = iAnimationFrameCount > 1;

    iFrameInfo = iDecoder->FrameInfo( 0 );

    iSizeAvailable = ETrue;

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

        // we only support gray2 and gray256 tiling

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

        TInt error = iDestination->Create( iFrameInfo.iOverallSizeInPixels, DisplayMode(), maskmode );

        if (!error)

            LoadFrame(0);

        else

            RunError(KErrNoMemory);

    }

    else {

    }

}

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

// CAnimationDecoderWrapped::MaskDisplayMode

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

TDisplayMode CAnimationDecoderWrapped::MaskDisplayMode() const

{

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

        if( iFrameInfo.iFlags & TFrameInfo::EAlphaChannel && (iFrameInfo.iFlags & TFrameInfo::ECanDither))

            return EGray256;

    return EGray2;

    }

    return ENone;

}

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

// CAnimationDecoderWrapped::AnimationFrameDelay

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

TTimeIntervalMicroSeconds32 CAnimationDecoderWrapped::AnimationFrameDelay( TInt aAnimationFrameIndex ) const

{

    __ASSERT_ALWAYS( aAnimationFrameIndex >= 0 &&

    aAnimationFrameIndex < iAnimationFrameCount, Panic( KErrArgument ) );

    return I64INT( iDecoder->FrameInfo( aAnimationFrameIndex ).iDelay.Int64() );

}

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

// CAnimationDecoderWrapped::DoCancel

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

void CAnimationDecoderWrapped::DoCancel()

{

    iDecoder->Cancel();

    // Delete all processed bitmaps

    ErrorCleanup();

    // Complete with cancel

    iImageState = EInactive;

}

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

// CAnimationDecoderWrapped::RunL

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

void CAnimationDecoderWrapped::RunL()

{

    // Yeah, we check this a lot in this function but it helps prevent stuff from happening that doesn't need to

    if (iIsInvalid) {

        delete this;

        return;

    }

    iCanBeDeleted = EFalse;

    __ASSERT_DEBUG( iDestination, Panic( KErrGeneral ) );

    // don't kick off the image decoding until the preview mode is over

    if (iStatus==KErrUnderflow) {

        if (!IsAnimation())

            iObserver->partialImage();

        iCanBeDeleted = ETrue;

        if (iIsInvalid)

            delete this;

        return;

    }

    else if( iStatus == KErrCorrupt ) {

        RunError( iStatus.Int() );

        iCanBeDeleted = ETrue;

        if (iIsInvalid)

            delete this;

        return;

    }

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

    switch( iImageState ) {

        case EStartLoad:

            {

            // start loading the bitmaps

            StartLoadL();

            break;

            }

        case ECompleteLoad:

            {

            // complete loading the bitmaps

            CompleteLoadL();

            break;

            }

        default:

            {

            iCanBeDeleted = ETrue;

            Panic( KErrTotalLossOfPrecision );

            }

    }

    iCanBeDeleted = ETrue;

    if (iIsInvalid)

        delete this;

}

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

// CAnimationDecoderWrapped::RunError

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

TInt CAnimationDecoderWrapped::RunError( TInt aError )

{

    // Delete all processed bitmaps

    ErrorCleanup();

    // Complete with error

    iImageState = EInactive;

    iObserver->decoderError(aError);

    return KErrNone;

}

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

// CAnimationDecoderWrapped::LoadFrame

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

TInt CAnimationDecoderWrapped::LoadFrame( TInt aFrameIndex )

{

    if( IsBusy() )

        return KErrNotReady;

    if( aFrameIndex < 0 || aFrameIndex >= iDecoder->FrameCount() )

        return KErrArgument;

    iFrameIndex = aFrameIndex;

    // Start the active object

    iImageState = EStartLoad;

    SelfComplete();

    return KErrNone;

}

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

// CAnimationDecoderWrapped::StartLoadL

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

void CAnimationDecoderWrapped::StartLoadL()

{

    __ASSERT_DEBUG( !iAnimationBitmap, Panic( KErrGeneral ) );

    if( iAnimation ) {

        // Start animation from first frame by default

        iAnimationFrameIndex = 0;

        // Check is animation can be continued on top of destination bitmap

        if( iDestination->FrameIndex() < iFrameIndex )

          iAnimationFrameIndex = iDestination->FrameIndex() + 1;

        StartLoadAnimationBitmapL( iAnimationFrameIndex );

    }

    else // normal image

        StartLoadNormalBitmap( iFrameIndex );

    iDecodeInProgress = EFalse;    

    iImageState = ECompleteLoad;

    SetActive();

}

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