windowing/windowserver/nonnga/remotegc/BitmapCache.cpp
changeset 0 5d03bc08d59c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/windowing/windowserver/nonnga/remotegc/BitmapCache.cpp	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,74 @@
+// Copyright (c) 2006-2009 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:
+//
+
+#include "BitmapCache.h"
+
+CBitmapCache::CBitmapCache() : CCacheBase()
+	{
+	
+	}
+
+CBitmapCache::~CBitmapCache()
+	{
+	
+	}
+
+/**
+Enables the use of a cached bitmap with a specified handle.
+If no bitmap with this handle is cached, the bitmap is created and cached.
+
+@return KErrNone if no problem occured, otherwise a systemwide error.
+*/
+TInt CBitmapCache::UseL(TInt aHandle)
+	{
+	TCacheEntry entry(aHandle);
+	TInt index = iCachedItems.FindInUnsignedKeyOrder(entry);
+	if(index != KErrNotFound)
+		{
+		iCachedItems[index].iIsUsed = ETrue;
+		return KErrNone;	
+		}
+		
+	entry.iCachedItem = new (ELeave) CFbsBitmap;	
+	TInt err = static_cast<CFbsBitmap*>(entry.iCachedItem)->Duplicate(aHandle);
+	if(err)
+		{
+		delete entry.iCachedItem;
+		return err;
+		}
+	
+	entry.iIsUsed = ETrue;		
+	CleanupStack::PushL(entry.iCachedItem);
+	iCachedItems.InsertInUnsignedKeyOrderL(entry);
+	CleanupStack::Pop(entry.iCachedItem);	
+	return KErrNone;
+	}
+
+/**
+Returns a bitmap from the cache corresponding to a specific handle.
+
+@param aHandle A handle to match against a bitmap in the cache.
+@return The bitmap that matches the handle provided as a parameter.
+*/
+const CFbsBitmap* CBitmapCache::Resolve(TInt aHandle)
+	{	
+	const CBase* item = CCacheBase::Resolve(aHandle);
+	if(item != NULL)
+		return static_cast<const CFbsBitmap*>(item);
+	else
+		return NULL;
+	}
+	
+