/*

* Copyright (c) 2008 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:  Preview provider ECOM plugin

*

*/

#include <bldvariant.hrh>

#ifdef SYMBIAN_BUILD_GCE

#define NGA

#endif

#include "previewprovidercrp.h"

#include "previewmsg.h"

#include "previewprovidercrplogging.h"

#include <ecom/implementationproxy.h>

#include <s32mem.h> //RDesReadStream

#ifdef NGA

#include <graphics/wsscreendevice.h>

#endif

// CONSTANTS

const TInt KImpId( 0x20016BEC );

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

// CPreviewProviderCRP::CreateL

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

//

CWsGraphicDrawer* CPreviewProviderCRP::CreateL()

    {

    CPreviewProviderCRP* crp = new (ELeave) CPreviewProviderCRP();

    CleanupStack::PushL( crp );

    crp->ConstructL();

    CleanupStack::Pop( crp );

    return crp;

    }

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

// CPreviewProviderCRP::ConstructL

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

//    

void CPreviewProviderCRP::ConstructL()

    { 

    }

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

// CPreviewProviderCRP::~CPreviewProviderCRP

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

//    

CPreviewProviderCRP::~CPreviewProviderCRP()    

    {

    Env().UnregisterEventHandler( this );

    iScreenshots.ResetAndDestroy();

    iWgIds.Close();

    }

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

// CPreviewProviderCRP::DoDraw

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

//

void CPreviewProviderCRP::DoDraw( MWsGc& /*aGc*/, const TRect& /*aRect*/, 

    const TDesC8& /*aData*/) const

    {

    //draws nothing

    }

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

// CPreviewProviderCRP::HandleMessage

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

//    

void CPreviewProviderCRP::HandleMessage( const TDesC8& aData )

    {

    TRAP_IGNORE( DoHandleMessageL( aData ) );

    }

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

// CPreviewProviderCRP::DoHandleMessageL

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

//    

void CPreviewProviderCRP::DoHandleMessageL( const TDesC8& aData )

    {  

    TSLOG_CONTEXT( DoHandleMessageL, TSLOG_LOCAL );

    TSLOG_IN();

    RDesReadStream in( aData );

    switch( in.ReadInt32L() )

        {

        case NPreviewMsg::ERegister:

            {

            const TInt id = in.ReadInt32L();

            Register( id );

            }

            break;

        case NPreviewMsg::EUnregister:

            {

            const TInt id = in.ReadInt32L();

            Unregister( id );

            }

            break;

        case NPreviewMsg::EChangeScreen:

            {

            const TInt screen = in.ReadInt32L();

            if ( Env().ScreenCount() )

                {

                iScreen = screen;

                }

            }

            break;

        case NPreviewMsg::ESetPreviewParam:

            iScreenshotSize.iWidth = in.ReadInt32L();

            iScreenshotSize.iHeight = in.ReadInt32L();

            iScreenshotMode = static_cast<TDisplayMode>( in.ReadInt32L() );

            break;

        case NPreviewMsg::ETakePreview:

            ScreenshotL();

            break;

        case NPreviewMsg::EAckPreviewReady:

            RemoveScreenshot( in.ReadInt32L() );

            break;

        }

    TSLOG_OUT();

    }

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

// CPreviewProviderCRP::ConstructL

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

//    

void CPreviewProviderCRP::ConstructL( MWsGraphicDrawerEnvironment& aEnv,

    const TGraphicDrawerId& aId, MWsClient& aOwner, const TDesC8& /*aData*/ )

    {

    TSLOG_CONTEXT( ConstructL, TSLOG_LOCAL );

    TSLOG_IN();

    BaseConstructL( aEnv, aId, aOwner );

    aEnv.RegisterEventHandler( this, this, TWservCrEvent::EWindowGroupChanged );

    TSLOG_OUT();

    }

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

// CPreviewProviderCRP::DoHandleEvent

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

//    

void CPreviewProviderCRP::DoHandleEvent( const TWservCrEvent& aEvent )

    {

    TSLOG_CONTEXT( DoHandleEvent, TSLOG_LOCAL );

    TSLOG_IN();

    if ( aEvent.Type() == TWservCrEvent::EWindowGroupChanged )

        {

        const TInt wgId = aEvent.WindowGroupIdentifier();

        if ( iWgIds.FindInOrder( iPrevId ) >= 0 ||

            ( iPrevId == 0 &&  iPrevReg != 0 ) )

            {

            TRAP_IGNORE( ScreenshotL() );

            iPrevReg = 0;

            }

        iPrevId = wgId;

        }

    TSLOG_OUT();

    }

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

// CPreviewProviderCRP::ScaleComplete

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

//    

void CPreviewProviderCRP::ScaleCompleteL( const CFbsBitmap& aBitmap )

    {

    TSLOG_CONTEXT( ScaleComplete, TSLOG_LOCAL );

    TSLOG_IN();

    const TInt msg[] = {

            NPreviewMsg::EPreviewReady,

            iPrevId?iPrevId:iPrevReg,

            aBitmap.Handle()

            };

    TPckgC<TInt[sizeof(msg) / sizeof(TInt)]> buf(msg);

    User::LeaveIfError( SendMessage( buf ) );

    TSLOG3( TSLOG_INFO, "size = %dx%d handle = %d",

        aBitmap.SizeInPixels().iWidth,

        aBitmap.SizeInPixels().iHeight,

        aBitmap.Handle() );

    TSLOG_OUT();

    }

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

// CPreviewProviderCRP::UnregisterComplete

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

//    

void CPreviewProviderCRP::UnregisterComplete( TInt aWgId )

    {

    TSLOG_CONTEXT( UnregisterComplete, TSLOG_LOCAL );

    TSLOG_IN();

    const TInt msg[] = {

            NPreviewMsg::EUnregisterReady,

            aWgId,

            0

            };

    TPckgC<TInt[sizeof(msg) / sizeof(TInt)]> buf(msg);

    SendMessage(buf);

    TSLOG_OUT();

    }

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

// CPreviewProviderCRP::Register

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

//    

void CPreviewProviderCRP::Register( TInt aWgId )

    {

    TSLOG_CONTEXT( Register, TSLOG_LOCAL );

    TSLOG_IN();

    iPrevReg = aWgId;

    iWgIds.InsertInOrder( aWgId );

    TSLOG_OUT();

    }

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

// CPreviewProviderCRP::Unregister

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

//

void CPreviewProviderCRP::Unregister( TInt aWgId )

    {

    TSLOG_CONTEXT( Unregister, TSLOG_LOCAL );

    TSLOG_IN();

    const TInt index = iWgIds.FindInOrder( aWgId );

    if ( index >= 0 )

        {

        iWgIds.Remove( index );

        }

    UnregisterComplete( aWgId );

    TSLOG_OUT();

    }

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

// CPreviewProviderCRP::ScreenShotL

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

//

void CPreviewProviderCRP::ScreenshotL()

    {

    CFbsBitmap* screenshot = new (ELeave)CFbsBitmap();

    CleanupStack::PushL( screenshot );

    ScreenshotL( *screenshot );

    ScaleCompleteL( *screenshot );

    iScreenshots.InsertL( screenshot, iScreenshots.Count() );

    CleanupStack::Pop( screenshot );

    CheckOverflow();

    }

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

// CPreviewProviderCRP::ScreenShotL

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

//

void CPreviewProviderCRP::ScreenshotL(CFbsBitmap& aBitmap)

    {

    TSLOG_CONTEXT( ScreenShot, TSLOG_LOCAL );

    TSLOG_IN();

    if( 0 > iScreen || Env().ScreenCount() <= iScreen )

        {

        //screen offset out of range. skip request

        User::Leave(KErrArgument);

        }

    // Find the screen resolution

    MWsScreenConfig* screenConfig = 

        Env().Screen( iScreen )->ObjectInterface<MWsScreenConfig>();    

    const TSize sz = screenConfig->ScreenModeSizeInPixels();

    // Get the screen buffer (containing screenshot data)

    MWsFrontBuffer* screenFront = 

        Env().Screen( iScreen )->ObjectInterface<MWsFrontBuffer>();

    // With NGA we do not support downscaling of the screenshots.

    // So use the size of the screen if no screenshot size has been explicitly

    // set or if the old method for taking screenshots is not available.

    if ( iScreenshotSize.iWidth == 0 || 

         iScreenshotSize.iHeight == 0 || 

         !screenFront )

        {

        iScreenshotSize = sz;

        }

    // Use the the same DisplayMode as for the source image

    // so override the display mode, ignoring any requests.

    iScreenshotMode = screenConfig->DisplayMode();

    TSLOG3( TSLOG_INFO, "iShotSize: %dx%d mode: %d",

        iScreenshotSize.iWidth, iScreenshotSize.iHeight, iScreenshotMode );

    aBitmap.Reset();

    User::LeaveIfError( aBitmap.Create( iScreenshotSize, iScreenshotMode ) );

    // Check if front buffer is available.

    // Will always be NULL with NGA.

    if ( screenFront )

        {

        TSLOG0( TSLOG_INFO, "non-NGA, using front buffer" );

        FrontBufferScreenShot( aBitmap, *screenFront, sz, screenConfig->Stride() );

        }

#ifdef NGA

    else

        {

        TSLOG0( TSLOG_INFO, "NGA, using CopyScreenToBitmapL" );

        MWsScreenDevice* screenDevice = static_cast<MWsScreenDevice*>(

            Env().Screen( iScreen )->ResolveObjectInterface(

                MWsScreenDevice::EWsObjectInterfaceId ) );

        User::LeaveIfNull( screenDevice );

        screenDevice->CopyScreenToBitmapL( &aBitmap, iScreenshotSize );

        }

#endif

    TSLOG_OUT();

    }

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

// CPreviewProviderCRP::RemoveScreenshot

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

//

void CPreviewProviderCRP::RemoveScreenshot( TInt aBitmapHandle )

    {

    for( int iter(0); iter < iScreenshots.Count(); ++iter )

        {

        if( iScreenshots[iter]->Handle() == aBitmapHandle )

            {

            delete iScreenshots[iter];

            iScreenshots.Remove(iter);

            break;

            }

        }

    }

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

// CPreviewProviderCRP::CheckOverflow

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

//

void CPreviewProviderCRP::CheckOverflow()

    {

    TInt overflow( iScreenshots.Count() - KMaxShots);

    while( 0 < overflow-- )

        {

        delete iScreenshots[0];

        iScreenshots.Remove(0);

        }

    }

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

// CPreviewProviderCRP::FrontBufferScreenShot

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

//    

void CPreviewProviderCRP::FrontBufferScreenShot( CFbsBitmap& aBitmap, 

                                                 MWsFrontBuffer& aFront, 

                                                 const TSize& aSrcSize, 

                                                 TInt aSrcStride )

    {

    TSLOG_CONTEXT( CPreviewProviderCRP::FrontBufferScreenShot, TSLOG_LOCAL );

    TSLOG_IN();

    const TUint8* src = static_cast<const TUint8*> ( aFront.GetBits() );

    TSLOG1( TSLOG_INFO, "src address = [%d]", src );

    TInt srcstride( aSrcStride );

    TInt srcwidth( aSrcSize.iWidth );

    TInt srcheight( aSrcSize.iHeight ); 

    TInt dststride( aBitmap.DataStride() );

    TInt dstheight( iScreenshotSize.iHeight );

    TInt dstwidth( iScreenshotSize.iWidth );

    TInt stepdst( dststride / dstwidth );

    TInt stepsrc( srcstride / srcwidth );

    // scale must be TInt type

    TInt scaleX( aSrcSize.iWidth / iScreenshotSize.iWidth );

    TInt scaleY( aSrcSize.iHeight / iScreenshotSize.iHeight );

    aBitmap.LockHeap();

    TUint8* dst = ( TUint8* ) aBitmap.DataAddress();

    TInt minWidth = Min( srcwidth, dstwidth );

    TInt minHeight = Min( srcheight, dstheight );

    TInt minStep = Min( stepsrc, stepdst );

    for ( TInt y = minHeight; y > 0; y-- )

         {

         for ( TInt x = minWidth; x > 0; x-- )

             {

             Mem::Copy( dst, src, minStep );

             dst += stepdst;

             src += scaleX*stepdst;

             }

         src += srcstride - scaleX * stepdst * minWidth;

         src += ( scaleY - 1 ) * srcstride;

         }

    aBitmap.UnlockHeap();

    TSLOG_OUT();

    }

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

// KImplementationTable

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

//    

LOCAL_C const TImplementationProxy KImplementationTable[] = 

    {

    IMPLEMENTATION_PROXY_ENTRY(KImpId, CPreviewProviderCRP::CreateL)

    };

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

// ImplementationGroupProxy

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

//    

EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount)

    {

    aTableCount = (sizeof(KImplementationTable) / sizeof(TImplementationProxy));

    return KImplementationTable;

    }

// End of file