1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/graphics/windowing/windowserver/nga/SERVER/wsfont.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,137 @@
     1.4 +// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.5 +// All rights reserved.
     1.6 +// This component and the accompanying materials are made available
     1.7 +// under the terms of "Eclipse Public License v1.0"
     1.8 +// which accompanies this distribution, and is available
     1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.10 +//
    1.11 +// Initial Contributors:
    1.12 +// Nokia Corporation - initial contribution.
    1.13 +//
    1.14 +// Contributors:
    1.15 +//
    1.16 +// Description:
    1.17 +// FONT related functions and the font cache
    1.18 +// 
    1.19 +//
    1.20 +
    1.21 +#include "wsfont.h"
    1.22 +
    1.23 +CWsFontCache * CWsFontCache::iSelf = NULL;
    1.24 +TDblQue<CWsFbsFont> * CWsFontCache::iList = NULL;
    1.25 +
    1.26 +CWsFontCache::CWsFontCache()
    1.27 +	{
    1.28 +	}
    1.29 +
    1.30 +CWsFontCache::~CWsFontCache()
    1.31 +	{
    1.32 +	}
    1.33 +
    1.34 +void CWsFontCache::CreateInstanceL()
    1.35 +	{
    1.36 +	// The list MUST exist before creation of the cache since the cache
    1.37 +	// contains an array of fonts. When the array is created the fonts add themselves
    1.38 +	// to the list.
    1.39 +	// The list is ordered from newest to oldest font used.
    1.40 +	iList = new (ELeave) TDblQue<CWsFbsFont>(_FOFF(CWsFbsFont,iLink));
    1.41 +	CleanupStack::PushL(iList);
    1.42 +	iSelf = new (ELeave) CWsFontCache;
    1.43 +	CleanupStack::Pop(iList);
    1.44 +	}
    1.45 +
    1.46 +void CWsFontCache::DestroyInstance()
    1.47 +	{
    1.48 +	// The cache has to be destroyed first since the fonts are
    1.49 +	// destroyed when the cache's array if destroyed. The fonts 
    1.50 +	// remove themselves from the list
    1.51 +	delete iSelf;
    1.52 +	iSelf = NULL;
    1.53 +	delete iList;
    1.54 +	iList = NULL;
    1.55 +
    1.56 +	}
    1.57 +
    1.58 +void CWsFontCache::ReleaseFont(CWsFbsFont *&aFont)
    1.59 +	{
    1.60 +	if (aFont)
    1.61 +		{
    1.62 +		WS_ASSERT_DEBUG(aFont->iCount>0, EWsPanicFontCacheCount);
    1.63 +		// decrease usage count
    1.64 +		aFont->iCount--;
    1.65 +		// when the font reaches zero then the font entry can be reused later
    1.66 +		aFont = NULL;
    1.67 +		}
    1.68 +	}
    1.69 +
    1.70 +TBool CWsFontCache::UseFont(CWsFbsFont *&aFont, TInt aHandle)
    1.71 +	{
    1.72 +	ReleaseFont(aFont);
    1.73 +	CWsFbsFont *font = NULL;
    1.74 +
    1.75 +	// The list is ordered from newest to oldest font used.
    1.76 +	TDblQueIter<CWsFbsFont> iter(*iList);
    1.77 +	
    1.78 +	
    1.79 +	// Search for the font from newest to oldest font
    1.80 +	while ((font = iter++) != NULL)
    1.81 +		{
    1.82 +		// if the font handle already exists use existing font
    1.83 +		if (font->Handle() == aHandle)
    1.84 +			{
    1.85 +			break;
    1.86 +			}
    1.87 +		}
    1.88 +
    1.89 +	// Font not found in cache so find an unused entry
    1.90 +	if (!font)
    1.91 +		{
    1.92 +		// Starting search from oldest to newest font unsed
    1.93 +		iter.SetToLast();
    1.94 +		while((font = iter--) != NULL)
    1.95 +			{
    1.96 +			// if you find an unused font then use that font entry
    1.97 +			if (font->iCount == 0)
    1.98 +				{
    1.99 +				break;
   1.100 +				}
   1.101 +			}
   1.102 +		// if an unused font is not found then all fonts are being used and 
   1.103 +		// the font can not be created
   1.104 +		if (!font)
   1.105 +			{
   1.106 +			return(ETrue);	// No room in cache
   1.107 +			}
   1.108 +		// release and reuse the font entry to create a new font
   1.109 +		font->Reset();
   1.110 +		if (font->Duplicate(aHandle) != KErrNone)
   1.111 +			{
   1.112 +			return(EFalse);	// Bad handle, (indicated by aFont=NULL)
   1.113 +			}
   1.114 +		}
   1.115 +	// put font at the font of the list as the font is the newest font
   1.116 +	font->iLink.Deque();
   1.117 +	iList->AddFirst(*font);
   1.118 +	// increase usage count
   1.119 +	font->iCount++;
   1.120 +	aFont = font;
   1.121 +	return(EFalse);
   1.122 +	}
   1.123 +
   1.124 +TDblQue<CWsFbsFont>& CWsFontCache::List()
   1.125 +	{
   1.126 +	return *Instance()->iList;
   1.127 +	}
   1.128 +	
   1.129 +CWsFbsFont::CWsFbsFont()
   1.130 +	{
   1.131 +	// add itself to the font cache
   1.132 +	CWsFontCache::List().AddLast(*this);
   1.133 +	}
   1.134 +
   1.135 +CWsFbsFont::~CWsFbsFont()
   1.136 +	{
   1.137 +	// remove itself from the font cache
   1.138 +	iLink.Deque();
   1.139 +	WS_ASSERT_DEBUG(iCount==0, EWsPanicFontCacheCount);
   1.140 +	}