sl@0: // Copyright (c) 2007-2009 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: #ifndef VGIMAGECACHE_H_
sl@0: #define VGIMAGECACHE_H_
sl@0: 
sl@0: /**
sl@0: @file
sl@0: @internalComponent Reference implementation of Open VG hardware accelerated DirectGDI adaptation.
sl@0: */
sl@0: #include <fbs.h>
sl@0: #include <VG/openvg.h>
sl@0: #include <e32hashtab.h>
sl@0: #include <graphics/directgdiextensioninterfaces.h>
sl@0: 
sl@0: 
sl@0: /**
sl@0: A class for managing a cache of VGImages.
sl@0: Each VGImage has a CFbsBitmap associated with it.
sl@0: The CFbsBitmap's serial number is used to retrieve VGImages from the cache
sl@0: as these are unique to the bitmap for the lifetime of the system.
sl@0: */
sl@0: NONSHARABLE_CLASS(CVgImageCache): public CBase, public MVgImageCache
sl@0: 	{
sl@0: public:
sl@0: 	CVgImageCache(TInt aMaxCacheSize);
sl@0: 	~CVgImageCache();
sl@0: 	TBool AddImage(const CFbsBitmap& aBitmap, VGImage& aImage, const TPoint& aOrigin);
sl@0: 	VGImage GetVgImageFromBitmap(const CFbsBitmap& aBitmap, const TPoint& aOrigin);
sl@0: 	
sl@0: 	//MVgImageCache commands
sl@0: 	TBool IsInCache(TInt64 aSerialNumber);	/**< @internalTechnology*/
sl@0: 	TInt TouchCount(TInt64 aSerialNumber);	/**< @internalTechnology*/
sl@0: 	TInt NumEntries() const;	/**< @internalTechnology*/
sl@0: 	void GetOrderedCacheEntries(TInt64& aSerialNumberList, TInt aListSize);	/**< @internalTechnology*/
sl@0: 	TInt CacheSizeInBytes() const;	/**< @internalTechnology*/
sl@0: 	TInt MaxCacheSize() const;	/**< @internalTechnology*/
sl@0: 	void ResetCache();	/**< @internalTechnology*/
sl@0: 	TInt SetMaxCacheSize(TInt aMaxCacheSize); /**< @internalTechnology*/
sl@0: 
sl@0: private:
sl@0: 	NONSHARABLE_CLASS(CVgImageCacheItem): public CBase
sl@0: 		{
sl@0: 		public:
sl@0: 		CVgImageCacheItem();
sl@0: 		~CVgImageCacheItem();
sl@0: 		
sl@0: 		TDblQueLink iLink;
sl@0: 		VGImage iImage;			/**< VGImage created from CFbsBitmap.*/
sl@0: 		TInt64 iSerialNumber;			/**< Bitmap ID used to select VGImage.*/
sl@0: 		TInt iImageSizeInBytes;
sl@0: 		TInt iTouchCount;		/**< Touch count of CFbsBitmap when VGImage was stored.*/
sl@0: 		TPoint iOrigin;			/**< Origin used to tile image when created.*/
sl@0: 		};
sl@0: 	void DeleteItem(CVgImageCacheItem* aItem);
sl@0: 	static TUint32 Hash(const TInt64& aKey);
sl@0: 
sl@0: private:
sl@0: 	RHashMap<TInt64, CVgImageCacheItem*> iCacheItemMap;	/**< Maps bitmap's unique identifier to a cache item.*/
sl@0: 	TDblQue<CVgImageCacheItem> iVgImageCache;	/**< Least-recently used ordered queue (most-recently used at head).*/
sl@0: 	TInt iCacheSizeInBytes;
sl@0: 	TInt iMaxCacheSizeInBytes;
sl@0: 	TInt iNumMatchMisses;	/**< Number of unsuccessful matches when retrieving VGImage from cache.*/
sl@0: 	TInt iNumMatchTries; /**< Number of attempts to retrieve VGImage from cache.*/
sl@0: 	};
sl@0: 
sl@0: #endif /*VGIMAGECACHE_H_*/