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// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#ifndef VGIMAGECACHE_H_
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#define VGIMAGECACHE_H_
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/**
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@file
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@internalComponent Reference implementation of Open VG hardware accelerated DirectGDI adaptation.
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*/
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#include <fbs.h>
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#include <VG/openvg.h>
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#include <e32hashtab.h>
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#include <graphics/directgdiextensioninterfaces.h>
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/**
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A class for managing a cache of VGImages.
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Each VGImage has a CFbsBitmap associated with it.
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The CFbsBitmap's serial number is used to retrieve VGImages from the cache
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as these are unique to the bitmap for the lifetime of the system.
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*/
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NONSHARABLE_CLASS(CVgImageCache): public CBase, public MVgImageCache
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{
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public:
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CVgImageCache(TInt aMaxCacheSize);
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~CVgImageCache();
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TBool AddImage(const CFbsBitmap& aBitmap, VGImage& aImage, const TPoint& aOrigin);
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VGImage GetVgImageFromBitmap(const CFbsBitmap& aBitmap, const TPoint& aOrigin);
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//MVgImageCache commands
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TBool IsInCache(TInt64 aSerialNumber); /**< @internalTechnology*/
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TInt TouchCount(TInt64 aSerialNumber); /**< @internalTechnology*/
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TInt NumEntries() const; /**< @internalTechnology*/
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void GetOrderedCacheEntries(TInt64& aSerialNumberList, TInt aListSize); /**< @internalTechnology*/
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TInt CacheSizeInBytes() const; /**< @internalTechnology*/
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TInt MaxCacheSize() const; /**< @internalTechnology*/
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void ResetCache(); /**< @internalTechnology*/
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TInt SetMaxCacheSize(TInt aMaxCacheSize); /**< @internalTechnology*/
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private:
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NONSHARABLE_CLASS(CVgImageCacheItem): public CBase
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{
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public:
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CVgImageCacheItem();
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~CVgImageCacheItem();
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TDblQueLink iLink;
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VGImage iImage; /**< VGImage created from CFbsBitmap.*/
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TInt64 iSerialNumber; /**< Bitmap ID used to select VGImage.*/
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TInt iImageSizeInBytes;
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TInt iTouchCount; /**< Touch count of CFbsBitmap when VGImage was stored.*/
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TPoint iOrigin; /**< Origin used to tile image when created.*/
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};
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void DeleteItem(CVgImageCacheItem* aItem);
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static TUint32 Hash(const TInt64& aKey);
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private:
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RHashMap<TInt64, CVgImageCacheItem*> iCacheItemMap; /**< Maps bitmap's unique identifier to a cache item.*/
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TDblQue<CVgImageCacheItem> iVgImageCache; /**< Least-recently used ordered queue (most-recently used at head).*/
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TInt iCacheSizeInBytes;
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TInt iMaxCacheSizeInBytes;
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TInt iNumMatchMisses; /**< Number of unsuccessful matches when retrieving VGImage from cache.*/
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TInt iNumMatchTries; /**< Number of attempts to retrieve VGImage from cache.*/
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};
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#endif /*VGIMAGECACHE_H_*/
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