/*

* Copyright (c) 2005 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:  This file implements the decoder for the SVG presentation

*

*/

#include "SVGConvert.h"

#include <coemain.h>

#include <imageconversion.h>

#include <icl_uids.hrh>

#include <SvgCodecImageConstants.hrh>

#include "SVGCodec.h"

_LIT(KSVGPanicCategory, "SVGConvertPlugin");

const TInt KInitialFrameWidth = 1;

const TInt KInitialFrameHeight = 1;

// Number of bits per pixel used in ReadFormatL

const TInt KSvgDecBitsPerPixel = 24;

enum TIclPanic

    {

    EFrameNumberOutOfRange = 0x1

    };

// Global panic function

GLDEF_C void Panic(TIclPanic aError)

    {

    User::Panic(KSVGPanicCategory, aError);

    }

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

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

// CSvgDecoder::NewL

// Static constructor. Returns the pointer to the CSvgDecoder

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

//

CSvgDecoder* CSvgDecoder::NewL()

    {

    return new (ELeave) CSvgDecoder;

    }

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

// CSvgDecoder::~CSvgDecoder

// C++ destructor.

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

//

CSvgDecoder::~CSvgDecoder()

    {

    CImageDecoderPlugin::Cleanup();

    }

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

// CSvgDecoder::ImageType 

// Returns the image type and sub-type for a given frame of the image that

// has just been opened.

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

//

void CSvgDecoder::ImageType(TInt aFrameNumber, TUid& aImageType, TUid& aImageSubType) const

    {

    __ASSERT_ALWAYS(aFrameNumber == 0, Panic( EFrameNumberOutOfRange ));

    aImageType = KImageTypeSVGUid;

    aImageSubType = KNullUid;

    }

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

// Returns the codec specific frame information stored in resource files.

// This is a virtual funtion that each individual plugin must implement.

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

//

CFrameInfoStrings* CSvgDecoder::FrameInfoStringsL( RFs& /*aFs*/, TInt /*aFrameNumber*/ )

    {

    return NULL;

    }

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

// CSvgDecoder::CSvgDecoder

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

// might leave.

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

//

CSvgDecoder::CSvgDecoder()

    {

    }

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

//    Invokes the ReadFrameHeadersL() method of the supplied plugin.

//    This is a virtual funtion that each individual plugin must implement.

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

//

void CSvgDecoder::ScanDataL()

    {

    CSvgReadCodec* imageReadCodec = CSvgReadCodec::NewL( 

        TSize(KInitialFrameWidth, KInitialFrameHeight) 

        );

    SetImageReadCodec( imageReadCodec );

    ReadFormatL();

    ReadFrameHeadersL();

    }

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

// Reads the image header & data information

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

//

void CSvgDecoder::ReadFormatL()

    {

    ReadDataL(0, iFileData, KMaxTInt);

    SetDataLength( iFileData.Length() );

    CSvgReadCodec* imageReadCodec = static_cast<CSvgReadCodec* >(ImageReadCodec());

    imageReadCodec->SetFileDataL( iFileData );

    imageReadCodec->PrepareEngine();

    const TSize contentSize = imageReadCodec->ContentSize();

    TFrameInfo imageInfo;

    imageInfo = ImageInfo();

    imageInfo.iFrameCoordsInPixels.SetRect(TPoint(0, 0), contentSize );

    imageInfo.iOverallSizeInPixels = contentSize;

    imageInfo.iBitsPerPixel = KSvgDecBitsPerPixel;

    imageInfo.iDelay = 0;

    imageInfo.iFlags = TFrameInfo::ECanDither | TFrameInfo::ETransparencyPossible;

    imageInfo.iFrameDisplayMode = EColor64K;

    imageInfo.iFrameSizeInTwips = ContentSizeInTwips(contentSize);

    SetImageInfo(imageInfo);

    SetStartPosition(0);

    }

TSize CSvgDecoder::ContentSizeInTwips(const TSize aContentSizeInPixels) const

    {

    // Create zoom factor object

    TRect boxInTwips(TPoint(0,0), TSize(0,0));

    CCoeEnv* coeEnv = CCoeEnv::Static();

    if(coeEnv)

        {

        TZoomFactor deviceMap(CCoeEnv::Static()->ScreenDevice());

        // Set zoom factor at 1 to 1

        deviceMap.SetZoomFactor(TZoomFactor::EZoomOneToOne);

        const TRect boxInPixels(TPoint(0,0), aContentSizeInPixels);

        // convert rectangle co-ordinates into pixels

        boxInTwips = deviceMap.PixelsToTwips(boxInPixels);

        }

    return boxInTwips.Size();

    }

// End of File