/*

* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Symbian Foundation License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.symbianfoundation.org/legal/sfl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  

*

*

*/

#ifndef AKN_ICON_SERVER_H

#define AKN_ICON_SERVER_H

//  INCLUDES

#include <e32base.h>

#include <s32file.h>

#include <fbs.h>

#include <AknIconUtils.h>

// CONSTANTS

// needed for creating server thread in WINS.

const TInt KAknIconSrvMinHeapSize = 0x10000;

const TInt KAknIconSrvMaxHeapSize = 0x4000000;

// opcodes used in message passing between client and server

enum TAknIconServRequest

    {

    ERetrieveOrCreateSharedIcon,

    EFreeBitmap,

    EGetContentDimensions,

    EPreserveIconData,

    EDestroyIconData,

    EGetInitData,

    EAknIconServRequestEnableCache,

    // For debug

    EServerHeapMark,

    EServerHeapMarkEnd,

    EServerHeapFailNext,

    EServerHeapFailNextIncreasing,

    EServerHeapReset,

    EServerResetDynamicallyChangingAllocations,

    EServerHeapUsed,

    EServerSetPreferredIconDisplayMode

    };

// return codes to client side (not actual errors)

const TInt KAknIconSrvCodeAnimated    = -100;

const TInt KAknIconSrvCodePanicClient = -101; // The AknIconSrv client has been panicked

_LIT( KAknIconSrvName, "!AknIconServer" );

_LIT( KAknIconSrvExe, "AknIconSrv.exe" );

_LIT( KAknIconLibName, "AknIcon.dll" );

// FUNCTION PROTOTYPES

// function to start the server thread/process

GLREF_C TInt StartServer();

// function to signal server startup semaphore

GLREF_C void SignalClient();

// FORWARD DECLARATIONS

class CAknIconSrvIconItem;

struct TAknIconParams;

class CAknIconLoader;

struct TAknIconSrvSessionIconItem;

struct TAknIconSrvSessionPreservedItem;

class CAknIconSrvCache;

class CAknIconSrvPrecacheItem;

class CAknIconSrvRequest;

class CAknIconSrvPrecacher;

struct TAknIconSrvReturnData;

struct TAknIconInitData;

class CAknIconDataPreserver;

class MAknIconFormatHandler;

class CAknIconDataItem;

class CAknIconFileNameCache;

// CLASS DECLARATION

/**

*  The server class, an active object.

*  Contains an instance of RServer, a handle to the kernel server

*  representation which is used to receive messages. 

*/

NONSHARABLE_CLASS(CAknIconServer) : public CServer2

    { 

    public:  // Constructors and destructor

        /**

        * constructs and starts the server.

        */

        static CAknIconServer* NewL();

        virtual ~CAknIconServer();

    public:

        /**

        * Opens a new session to the server.

        *

        * @param aVersion required version of the server.

        *

        * @return pointer to a new session

        *

        * Leaves if:

        * - Out of memory (KErrNoMemory)

        */

		CSession2* NewSessionL( const TVersion& aVersion, const RMessage2& aMessage ) const;

        /**

        * Server bootstrap code.

        */

        IMPORT_C static TInt ThreadStart();

        const CAknIconSrvIconItem* RetrieveOrCreateSharedIconL();

        const CAknIconSrvIconItem* FreeBitmapL();

        const CAknIconDataItem* PreserveIconDataL();

        const CAknIconDataItem* UnpreserveIconDataL();

        void GetContentDimensionsL();

        void CleanupSessionIconItem( 

            const TAknIconSrvSessionIconItem& aItem );

        void CleanupSessionPreservedItem(

            const TAknIconSrvSessionPreservedItem& aItem );

        void RemoveCachedItem( const CAknIconSrvIconItem& aItem );

        inline RFs& FsSession();

        inline TRequestStatus& ThreadLaunchStatus();

        inline CAknIconSrvPrecacher& Precacher();

        inline TDisplayMode IconDepth() const;

        /* Clears "permanently cached" flag from the items that are premanently cached

        *  according to the currently active skin. Deletes them from the icon item array,

        *  if no-one is using them.

        */

        void InvalidateItemsCachedFromSkin();

        /*

        * For debug only.

        */

        void ResetDynamicallyChangingAllocations();

        void SetPreferredIconDisplayMode( TDisplayMode aMode );

        /*

        * Gets information of handles to an empty bitmap used in error cases

        * and the configuration data from the resource file.

        */

        void GetInitData( TAknIconInitData& aData ) const;

        CAknIconLoader* InitIconLoaderL( const TDesC& aFileName, RFile* aFile );

        /**

        * Releases the icon loader if a backup/restore operation is going on.

        */

        void IconLoaderUsed();

        /**

        * Cleanup item function for making sure that the used icon file is properly

        * closed after use to avoid problems with e.g. uninstallations or backup/restore.

        */

        static void CleanupIconLoader( TAny* aServer );

        /**

        * Returns the file handle that is transferred from the client side

        * and adopted by the current session object.

        * If a file handle is not supplied by the client, this returns

        * a closed file handle.

        * Caller of this method does not need to close this file handle.

        */

        RFile& RetrieveFileHandleL();

        inline CAknIconFileNameCache& IconFileNameCache();

        /*

        * Enable or disable the cache.

        */

		void EnableCache(TBool aEnable);

		/**

        * Loads icon data and initializes icon format handler.

        * The returned icon format handler is owned by the 

        * CAknIconServer object.

        */

		TPtrC8 InitIconDataAndHandlerLC(

            const TAknIconParams& aParams,

            CAknIconLoader*& aLoader,

            MAknIconFormatHandler*& aHandler );

    private: // New methods

        TInt RetrieveIcon( const TAknIconParams& aInfo );

        CAknIconSrvIconItem* CreateIconL( const TAknIconParams& aInfo );

        CAknIconSrvIconItem* CreateMbmIconL( 

            const TAknIconParams& aInfo,

            const TAknIconSrvReturnData& aHandles );

        static void ApplyIconColorL( CAknIconSrvIconItem* aItem, const TRgb aColor );

        /*

        * Returns ETrue if aItem is deleted otherwise EFalse.  

        */

        TBool DeleteOrCacheUnusedIcon(CAknIconSrvIconItem* aItem);

        void ReCreateSvgL( TAknIconParams& aInfo, CAknIconSrvIconItem *& aItem); 

    private:

        CAknIconServer();

        void ConstructL();

    private:     // data

        // Configuration data from the resource file.

        TInt iCompression;

        TDisplayMode iIconMode;

        TDisplayMode iIconMaskMode;

        TDisplayMode iPhotoMode;

        TDisplayMode iVideoMode;

        TDisplayMode iOffscreenMode;

        TDisplayMode iOffscreenMaskMode;

        // ---

        RFs iFsSession;

        RPointerArray<CAknIconSrvIconItem> iIconItems;

        // List of Icon Format Handlers

        // Shared with other classes must be deleted at last.

        RPointerArray<MAknIconFormatHandler> iHandlerList;

        // Always icon loader for avkon icon file.

        CAknIconLoader* iAvkonIconLoader;

        // Icon loader for previously accessed other icon file.

        CAknIconLoader* iOtherIconLoader;

        HBufC* iCurrentIconFile;

        TInt iCurrentIndex; // Helper to keep array index valid.

        CAknIconDataPreserver* iIconDataPreserver;

        // Cache configuration

        CAknIconSrvCache* iCache;

        // ---------------------------------------------------------------------

        // Precache thread writes to the following member variables.

        // ---------------------------------------------------------------------

        TRequestStatus iThreadLaunchStatus;

        // Cached information of icon file names

        CAknIconFileNameCache* iFileNameCache;

#ifdef PRECACHE2

        // All precached items are copied to this array

        RPointerArray<CAknIconSrvIconItem> iNewPrecachedItems;

        // This list of bitmaps is used to keep track of bitmaps which are valid in precache 

        RPointerArray<CFbsBitmap> iFreePrecacheBitmapHandles;

        //Used to indicate if all the items in the resource file have been parsed

        TBool iPrecacheComplete;

        //Thread in which the precaching occurs

        RThread iPreCacheThread;

#endif

    private:

        friend class CAknIconSrvPrecacher;

        friend class CAknIconSrvCache;

#ifdef _NGATESTING        

        void LoadConfigurationL(RFs& aFs);

        TInt32      iConfigIconType;

        TFileName   iNGADirectory;

#endif

    };

#include "AknIconSrv.inl"

#endif // AKN_ICON_SERVER_H

// Enf of File