/*

* Copyright (c) 2003 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:  SVG Implementation header file

 *

*/

#ifndef SVGDECODER_H

#define SVGDECODER_H

#include <stdio.h>

#include <e32std.h>

#include <string.h>

#include <e32base.h>

#include <f32file.h>

#include <s32file.h>

#include "SVGPaintCssValueImpl.h"

#include "SVGPathElementImpl.h"

#include "GfxGeneralPath.h"

#include "SVGSvgElementImpl.h"

#include "SVGImageElementImpl.h"

#include "SVGDocumentImpl.h"

#include "SVGErrorImpl.h"

enum TGfxEncodedSegType

    {

    EGfxEncodedSegMoveTo,

    EGfxEncodedSegLineTo,

    EGfxEncodedSegQuadTo,

    EGfxEncodedSegCubicTo,

    EGfxEncodedSegClose

    };

class CSvgDecoder : public CBase

{

public:

	   /**

      * Two phase constructor

      *

      * @since 1.0

      * @param None

	  * @return An isntance of this class

      */

	static CSvgDecoder* NewL(const TDesC& aFileName);

	 /**

      * Two phase constructor

      *

      * @since 1.0

      * @param None

	  * @return An isntance of this class

      */

	static CSvgDecoder* NewL(const TDesC8& aByteData);

		/**

         * Reads a Descriptor's data

         *

         * @since 1.0

         * @param

         * @return the created descriptor

         */

	TDesC& DecodeTDesCLC();

    	/**

         * Reads a Descriptor's data. Used only for image element with

         *      Embedde image.       

         * @since 1.0

         * @param

         * @return the created descriptor

         */

	TDesC& DecodeImageEmbeddedTDesCLC();

		/**

         * start of the decoder

         *     

         * @since 1.0

         * @param

         * @return the root element

		 */

	CSvgElementImpl*         StartDecodingL(CSvgDocumentImpl *aDocument, CSvgErrorImpl& aError);

		/**

         * Read Data of a particular attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TInt                     DecodeAttributeL(const TUint16 aName);

		/**

         * Read Data of a presentation attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodePresentationAttributeL(const TUint16 aName);

		/**

         * Read Data of a SVGT attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeSVGTAttributeL(const TUint16 aName);

	/**

         * Read Data of a SVGT attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeAnimationAttributeL(const TUint16 aName);

		/**

         * Read Data of a SVGT attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeSvgElementAttributeL(const TUint16 aName);

		/**

         * Read Data of a SVGT attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeLangSpaceAttributeL(const TUint16 aName);

		/**

         * Read Data of an attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeTransformAttributeL(const TUint16 aName);

		/**

         * Read Data of an  attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeTestAttributeL(const TUint16 aName);

		/**

         * Read Data of an  attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeIdAndXmlAttributeL(const TUint16 aName);

		/**

         * Read Data of an  attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeUriRefAttributeL(const TUint16 aName);

	/**

     * Decode attributes for Discard element

     *

     * @since 1.2

     * @param Attribute Id

     * @return A value that indicates success/failure

     */

    TBool                    DecodeDiscardAttributeL (const TUint16& aName);

		/**

         * Read Data of an  attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	void                     SetPaintValueL (CCssValue*& aValue);

		/**

         * Read Data of an attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeColorCssValueL(const TUint16 aName);

		/**

         * Read Data of an  attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeFloatCssValueL(const TUint16 aName);

		/**

         * Read Data of an  attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

    TBool                    DecodeIntCssValueL(const TUint16 aName);

		/**

         * Read Data of an  attribute

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeStringCssValueL(const TUint16 aName);

		/**

         * Read a Des attribute value

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeAttributeDesL(const TUint16 aName);

		/**

         * Read a path attribute value

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeAttributePathL(const TUint16 aName);

	void                    DecodeAnimationPathL(CGfxGeneralPath*& aPath);

		/**

         * Read a float attribute value

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

	TBool                    DecodeAttributeFloatL(const TUint16 aName);

		/**

         * Read a Int attribute value

         *

         * @since 1.0

         * @param Attribute Id

         * @return A value that indicates success/failure

         */

    TBool                    DecodeAttributeIntL(const TUint16 aName);

	// checks whether required attributes are present.

	void                     CheckRequiredAttributesL(const TUint8  aName);

		 /**

         * Destructor

         *

         * @since 1.0

         * @param None

         * @return None

         */

	~CSvgDecoder();

	void RemoveFalseSwitchCases();

	void RemoveFalseElements();

	TBool VerifyReqExReqFtrSysL( CSvgElementImpl* aElement );

    /**

    * Find out the system language for the client environment  based on

    * SVG source hint

    *

    * @since 1.0

    * @param aValue - A string buffer that contains the System Language hint

    * @return  None

    */

    void SystemLanguage( TPtr aValue );

private:

	     // Default constructor

	CSvgDecoder();

		 /**

         * Part of two phase construction

         *

         * @since 1.0

         * @param None

         * @return None

         */

	void ConstructL(const TDesC& aFileName);

	// to read from a descriptor

	void ConstructL(const TDesC8& aByteData);

    /**

     * Removes references of element. Usually called before the element is

     * deleted.

     *

     * @since s60 3.2

     * @param aElement Pointer of element that is about to be deleted.

     * @return none

     */

    void RemoveInternalReferences( CSvgElementImpl* aElement );

private: // Data

	//All the functions in the class RReadStream that are used for reading data can Leave.

	RReadStream	   iStream;

	RFileReadStream iFStream;

	RDesReadStream  iDStream;

	RFs  iFs;

     CSvgElementImpl*iRootElement; // SVG Element

     CSvgElementImpl*iCurrentElement; // Latest discovered element

     CSvgElementImpl*iCurrentParentElement; // Parent element for the current depth

     CSvgDocumentImpl*   iDocument; // The document object to which this SVG source is processed

	  // Various attributes that hold document "depth" information

     TInt        iIgnoreDepth;

     TBool       iIsSvgElement;

    // Various booleans that indicate success/failure or true/false for various attributes

	 TBool       iIsAnimElement;

	 CSvgErrorImpl*  iSvgError;

	/* Added to support forward references in USE, Animation and Animate elements*/	 

     RPointerArray<CSvgElementImpl>*    iUseElementArray;

     RPointerArray<CSvgElementImpl>*    iAnimationElementArray;

	 RPointerArray<CSvgElementImpl>*	iAnimRefElementArray;

	//array to keep track of switch elements

	//so we can go back at the end of parsing and remove the elements

	//that dont evaluate to true from memory

	RPointerArray<CSvgElementImpl>*    iSwitchElementArray;

	RPointerArray<CSvgElementImpl>*	   iReqFetAttSysArray;

    //variable to tell if the encoder was encoding fixed points or floats   

	TBool iIsFixPt;

	TBool iIsRGB;

	RPointerArray<CSvgImageElementImpl>    iImageElements;

    // Embedded Images Need to be kept track cause loadimage is not called on them

    // iImageElements has only images that have uri

    // Document needs to be set with the total images so that it can perform a

    // callback to the client and indicate that all image loading is complete

    TInt iEmbeddedImagesCount;

};

#endif