/*

* Copyright (c) 2007-2009 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: 

* SHAPERCACHE.CPP

*

*/

#include <fntstore.h>

#include <gdi.h>

#include "FNTSTD.H"

#include <graphics/shapeimpl.h>

const TInt KMaxShaperSesssionCacheMemory = 64*1024;

//class to store the handle the handle-reference count

class THandleCount

	{

public:

	THandleCount(TInt aSessionHandle)

	:iSessionHandle(aSessionHandle),iRefCount(1),iNext(NULL){}	

public:

	TInt iSessionHandle;

	TInt iRefCount;

	THandleCount* iNext;	

	};

/******************** SHAPER CACHE CLASSES*************************************/	

class COpenFontShaperCacheEntry: public CBase

	{

public:

	static COpenFontShaperCacheEntry* New(RHeap* aHeap, CShaper::TInput aInput, TShapeHeader* aShapeHeader);

	static COpenFontShaperCacheEntry* New(RHeap* aHeap);

	static void Delete (RHeap* aHeap, COpenFontShaperCacheEntry* aCache);	

	TBool IsSentinel(){return iShapeHeader==NULL;}

	TInt IncRefCount(TInt aSessionHandle);

	TInt DecRefCount(TInt aSessionHandle,TBool aReset=EFalse);	

private:

	COpenFontShaperCacheEntry(RHeap* aHeap,CShaper::TInput aInput)

	:iStart(aInput.iStart),iEnd(aInput.iEnd),iScript(aInput.iScript), iHeap(aHeap){}

	COpenFontShaperCacheEntry(){}

	TInt Construct(CShaper::TInput aInput,TShapeHeader* aShapeHeader);

public:

	COpenFontShaperCacheEntry* iPrevious;	// pointer to previous node in tree

	COpenFontShaperCacheEntry* iNext;		// pointer to next shaping info node in the list

	/** The shaped information that is cached */

	TShapeHeader* iShapeHeader;

	/** Input information */

	TUint16* iText;

	TInt iStart;

	TInt iEnd;

	TInt iScript;

	/** pointer to a private heap for allocating the handle-refcount array*/

	RHeap* iHeap;

	/** linked list of THandleCount to store the handle-refcount information */

	THandleCount* iHandleRefList;

	TInt iHandleRefCount;

	};

/***********************SHAPER CACHE ENDS HERE********************************/