--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/windowing/windowserver/nga/SERVER/wsfont.cpp	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,137 @@
+// 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:
+// FONT related functions and the font cache
+// 
+//
+
+#include "wsfont.h"
+
+CWsFontCache * CWsFontCache::iSelf = NULL;
+TDblQue<CWsFbsFont> * CWsFontCache::iList = NULL;
+
+CWsFontCache::CWsFontCache()
+	{
+	}
+
+CWsFontCache::~CWsFontCache()
+	{
+	}
+
+void CWsFontCache::CreateInstanceL()
+	{
+	// The list MUST exist before creation of the cache since the cache
+	// contains an array of fonts. When the array is created the fonts add themselves
+	// to the list.
+	// The list is ordered from newest to oldest font used.
+	iList = new (ELeave) TDblQue<CWsFbsFont>(_FOFF(CWsFbsFont,iLink));
+	CleanupStack::PushL(iList);
+	iSelf = new (ELeave) CWsFontCache;
+	CleanupStack::Pop(iList);
+	}
+
+void CWsFontCache::DestroyInstance()
+	{
+	// The cache has to be destroyed first since the fonts are
+	// destroyed when the cache's array if destroyed. The fonts 
+	// remove themselves from the list
+	delete iSelf;
+	iSelf = NULL;
+	delete iList;
+	iList = NULL;
+
+	}
+
+void CWsFontCache::ReleaseFont(CWsFbsFont *&aFont)
+	{
+	if (aFont)
+		{
+		WS_ASSERT_DEBUG(aFont->iCount>0, EWsPanicFontCacheCount);
+		// decrease usage count
+		aFont->iCount--;
+		// when the font reaches zero then the font entry can be reused later
+		aFont = NULL;
+		}
+	}
+
+TBool CWsFontCache::UseFont(CWsFbsFont *&aFont, TInt aHandle)
+	{
+	ReleaseFont(aFont);
+	CWsFbsFont *font = NULL;
+
+	// The list is ordered from newest to oldest font used.
+	TDblQueIter<CWsFbsFont> iter(*iList);
+	
+	
+	// Search for the font from newest to oldest font
+	while ((font = iter++) != NULL)
+		{
+		// if the font handle already exists use existing font
+		if (font->Handle() == aHandle)
+			{
+			break;
+			}
+		}
+
+	// Font not found in cache so find an unused entry
+	if (!font)
+		{
+		// Starting search from oldest to newest font unsed
+		iter.SetToLast();
+		while((font = iter--) != NULL)
+			{
+			// if you find an unused font then use that font entry
+			if (font->iCount == 0)
+				{
+				break;
+				}
+			}
+		// if an unused font is not found then all fonts are being used and 
+		// the font can not be created
+		if (!font)
+			{
+			return(ETrue);	// No room in cache
+			}
+		// release and reuse the font entry to create a new font
+		font->Reset();
+		if (font->Duplicate(aHandle) != KErrNone)
+			{
+			return(EFalse);	// Bad handle, (indicated by aFont=NULL)
+			}
+		}
+	// put font at the font of the list as the font is the newest font
+	font->iLink.Deque();
+	iList->AddFirst(*font);
+	// increase usage count
+	font->iCount++;
+	aFont = font;
+	return(EFalse);
+	}
+
+TDblQue<CWsFbsFont>& CWsFontCache::List()
+	{
+	return *Instance()->iList;
+	}
+	
+CWsFbsFont::CWsFbsFont()
+	{
+	// add itself to the font cache
+	CWsFontCache::List().AddLast(*this);
+	}
+
+CWsFbsFont::~CWsFbsFont()
+	{
+	// remove itself from the font cache
+	iLink.Deque();
+	WS_ASSERT_DEBUG(iCount==0, EWsPanicFontCacheCount);
+	}