sl@0: /*
sl@0: * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: 
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: #include <fntstore.h>
sl@0: #include <gdi.h>
sl@0: #include "FNTSTD.H"
sl@0: #include <graphics/shapeimpl.h>
sl@0: #include "ShaperCache.H"
sl@0: 
sl@0: //class COpenFontShaperCacheEntry;
sl@0: COpenFontShaperCacheEntry* COpenFontShaperCacheEntry::New(RHeap* aHeap)
sl@0: 	{
sl@0: 	COpenFontShaperCacheEntry* entry = (COpenFontShaperCacheEntry*)aHeap->Alloc(sizeof(COpenFontShaperCacheEntry));
sl@0: 	if (!entry)
sl@0: 		return NULL;
sl@0: 	new(entry) COpenFontShaperCacheEntry();	
sl@0: 	return entry;
sl@0: 	}
sl@0: 	
sl@0: COpenFontShaperCacheEntry* COpenFontShaperCacheEntry::New(RHeap* aHeap, CShaper::TInput aInput, TShapeHeader* aShapeHeader)
sl@0: 	{
sl@0: 	COpenFontShaperCacheEntry* entry = (COpenFontShaperCacheEntry*)aHeap->Alloc(sizeof(COpenFontShaperCacheEntry));
sl@0: 	if (!entry)
sl@0: 		return NULL;
sl@0: 	new(entry) COpenFontShaperCacheEntry(aHeap,aInput);
sl@0: 	TInt ret=entry->Construct(aInput,aShapeHeader);
sl@0: 	if (ret!=KErrNone)
sl@0: 		{
sl@0: 		aHeap->Free(entry);
sl@0: 		return NULL;
sl@0: 		}
sl@0: 	return entry;
sl@0: 	}
sl@0: 
sl@0: TInt COpenFontShaperCacheEntry::Construct(CShaper::TInput aInput,TShapeHeader* aShapeHeader)
sl@0: 	{
sl@0: 	// Get some memory for the shape header
sl@0: 	iShapeHeader = (TShapeHeader*)( iHeap->Alloc(
sl@0: 	sizeof(TShapeHeader) + (aShapeHeader->iGlyphCount * 10) + 4));
sl@0: 	if (iShapeHeader==NULL)
sl@0: 		{
sl@0: 		return KErrNoMemory;
sl@0: 		}
sl@0: 	Mem::Copy(iShapeHeader, aShapeHeader,sizeof(TShapeHeader) + (aShapeHeader->iGlyphCount * 10) + 4);
sl@0: 	
sl@0: 	// Get some memory for the input text
sl@0: 	iText = (TUint16*)(iHeap->Alloc(sizeof(TUint16)*aInput.iText->Length()));
sl@0: 	if (iText==NULL)
sl@0: 		{
sl@0: 		iHeap->Free(iShapeHeader);
sl@0: 		return KErrNoMemory;
sl@0: 		}
sl@0: 	TUint16* inputText = (TUint16*)aInput.iText->Ptr();
sl@0: 	Mem::Copy(iText, inputText, sizeof(TUint16)*aInput.iText->Length());
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 	
sl@0: /**
sl@0: Utility function used to free memory taken up by an entry to the cache
sl@0: @internalTechnology
sl@0: **/
sl@0: void COpenFontShaperCacheEntry::Delete(RHeap* aHeap,COpenFontShaperCacheEntry* aCacheEntry)
sl@0: 	{
sl@0: 	if (!aCacheEntry->IsSentinel())
sl@0: 		{
sl@0: 		aHeap->Free(aCacheEntry->iShapeHeader);
sl@0: 		aHeap->Free(aCacheEntry->iText);
sl@0: 		//now free the THandleCount list
sl@0: 		if (aCacheEntry->iHandleRefList)
sl@0: 			{
sl@0: 			THandleCount* ptr=aCacheEntry->iHandleRefList;
sl@0: 			while (ptr)
sl@0: 				{
sl@0: 				THandleCount* next=ptr->iNext;
sl@0: 				aHeap->Free(ptr);
sl@0: 				ptr=next;
sl@0: 				}
sl@0: 			aCacheEntry->iHandleRefList=NULL;
sl@0: 			}
sl@0: 		aHeap->Free(aCacheEntry);
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: //function to update the ref count for a particular session handle	
sl@0: TInt COpenFontShaperCacheEntry::IncRefCount(TInt aSessionHandle)
sl@0: 	{
sl@0: 	//get pointer to start of the linked list
sl@0: 	THandleCount* ptr=iHandleRefList;
sl@0: 	THandleCount* last=NULL;
sl@0: 	//loop through existing entries first
sl@0: 	while (ptr)
sl@0: 		{
sl@0: 		if (ptr->iSessionHandle==aSessionHandle)
sl@0: 			{
sl@0: 			ptr->iRefCount++;
sl@0: 			return KErrNone;			
sl@0: 			}
sl@0: 		last=ptr;
sl@0: 		ptr=ptr->iNext;
sl@0: 		}
sl@0: 	// now we have reached the end of the list or we start with empty list
sl@0: 	THandleCount* handle=(THandleCount*)iHeap->Alloc(sizeof(THandleCount));
sl@0: 	if (!handle)
sl@0: 		return KErrNoMemory;
sl@0: 	new (handle)THandleCount(aSessionHandle);
sl@0: 	//if the list is initially empty
sl@0: 	if (!last)
sl@0: 		iHandleRefList=handle;
sl@0: 	else
sl@0: 		last->iNext=handle;
sl@0: 	iHandleRefCount++;
sl@0: 	return KErrNone;	
sl@0: 	}
sl@0: 
sl@0: //function to decrement the ref count for a particular session handle
sl@0: //aReset here is used to immediately reset the handleCount reference to zero
sl@0: //and remove from the entry(this will be called in the case when a client session dies
sl@0: //Note that once the ref count reaches zero the THandleCount entry is automatically
sl@0: //removed from the list
sl@0: TInt COpenFontShaperCacheEntry::DecRefCount(TInt aSessionHandle,TBool aReset)
sl@0: 	{
sl@0: 	//get pointer to start of the linked list
sl@0: 	THandleCount* ptr=iHandleRefList;
sl@0: 	THandleCount* last=NULL;
sl@0: 	//loop through existing entries first
sl@0: 	while (ptr)
sl@0: 		{
sl@0: 		if (ptr->iSessionHandle==aSessionHandle)
sl@0: 			{
sl@0: 			if (aReset || ptr->iRefCount==1)
sl@0: 				{
sl@0: 				THandleCount* next=ptr->iNext;
sl@0: 				//delete from first item
sl@0: 				if (last==NULL)
sl@0: 					iHandleRefList=next;
sl@0: 				else
sl@0: 					last->iNext=next;
sl@0: 				iHeap->Free(ptr);
sl@0: 				iHandleRefCount--;			
sl@0: 				return KErrNone;
sl@0: 				}
sl@0: 			ptr->iRefCount--;
sl@0: 			return KErrNone;			
sl@0: 			}
sl@0: 		last=ptr;	
sl@0: 		ptr=ptr->iNext;
sl@0: 		}
sl@0: 	return KErrNotFound;	
sl@0: 	}	
sl@0: