--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graphicsdeviceinterface/directgdiadaptation/hwsrc/vgimagecache.h	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,79 @@
+// 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:
+//
+
+#ifndef VGIMAGECACHE_H_
+#define VGIMAGECACHE_H_
+
+/**
+@file
+@internalComponent Reference implementation of Open VG hardware accelerated DirectGDI adaptation.
+*/
+#include <fbs.h>
+#include <VG/openvg.h>
+#include <e32hashtab.h>
+#include <graphics/directgdiextensioninterfaces.h>
+
+
+/**
+A class for managing a cache of VGImages.
+Each VGImage has a CFbsBitmap associated with it.
+The CFbsBitmap's serial number is used to retrieve VGImages from the cache
+as these are unique to the bitmap for the lifetime of the system.
+*/
+NONSHARABLE_CLASS(CVgImageCache): public CBase, public MVgImageCache
+	{
+public:
+	CVgImageCache(TInt aMaxCacheSize);
+	~CVgImageCache();
+	TBool AddImage(const CFbsBitmap& aBitmap, VGImage& aImage, const TPoint& aOrigin);
+	VGImage GetVgImageFromBitmap(const CFbsBitmap& aBitmap, const TPoint& aOrigin);
+	
+	//MVgImageCache commands
+	TBool IsInCache(TInt64 aSerialNumber);	/**< @internalTechnology*/
+	TInt TouchCount(TInt64 aSerialNumber);	/**< @internalTechnology*/
+	TInt NumEntries() const;	/**< @internalTechnology*/
+	void GetOrderedCacheEntries(TInt64& aSerialNumberList, TInt aListSize);	/**< @internalTechnology*/
+	TInt CacheSizeInBytes() const;	/**< @internalTechnology*/
+	TInt MaxCacheSize() const;	/**< @internalTechnology*/
+	void ResetCache();	/**< @internalTechnology*/
+	TInt SetMaxCacheSize(TInt aMaxCacheSize); /**< @internalTechnology*/
+
+private:
+	NONSHARABLE_CLASS(CVgImageCacheItem): public CBase
+		{
+		public:
+		CVgImageCacheItem();
+		~CVgImageCacheItem();
+		
+		TDblQueLink iLink;
+		VGImage iImage;			/**< VGImage created from CFbsBitmap.*/
+		TInt64 iSerialNumber;			/**< Bitmap ID used to select VGImage.*/
+		TInt iImageSizeInBytes;
+		TInt iTouchCount;		/**< Touch count of CFbsBitmap when VGImage was stored.*/
+		TPoint iOrigin;			/**< Origin used to tile image when created.*/
+		};
+	void DeleteItem(CVgImageCacheItem* aItem);
+	static TUint32 Hash(const TInt64& aKey);
+
+private:
+	RHashMap<TInt64, CVgImageCacheItem*> iCacheItemMap;	/**< Maps bitmap's unique identifier to a cache item.*/
+	TDblQue<CVgImageCacheItem> iVgImageCache;	/**< Least-recently used ordered queue (most-recently used at head).*/
+	TInt iCacheSizeInBytes;
+	TInt iMaxCacheSizeInBytes;
+	TInt iNumMatchMisses;	/**< Number of unsuccessful matches when retrieving VGImage from cache.*/
+	TInt iNumMatchTries; /**< Number of attempts to retrieve VGImage from cache.*/
+	};
+
+#endif /*VGIMAGECACHE_H_*/