1 // Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 /**

    17  @file

    18  @internalTechnology

    19 */

    20 

    21 #ifndef CMTPIMAGEDPTHUMBNAILCREATOR_H

    22 #define CMTPIMAGEDPTHUMBNAILCREATOR_H

    23 

    24 // INCLUDES

    25 #include <e32base.h>

    26 

    27 #include <thumbnailmanager.h>

    28 #include <thumbnailmanagerobserver.h>

    29 #include <thumbnailobjectsource.h>

    30 #include <thumbnaildata.h>

    31 #include <imageconversion.h>

    32 #include <bitmaptransforms.h>

    33 

    34 class CMTPTypeOpaqueData;

    35 

    36 #include "mtpdebug.h"

    37 

    38 #define MTPTHUMBSCALING

    39 

    40 // CLASS DECLARATION

    41 /**

    42 *  A class for reading image related info and creating a thumbnail from 

    43 *  an image.

    44 *

    45 *  @lib ptpstack.lib

    46 *  @since S60 3.2

    47 */

    48 class CMTPImageDpThumbnailCreator : public CActive, public MThumbnailManagerObserver

    49     {

    50 public:

    51 

    52     /**

    53      * Two-phased constructor.

    54      * @param None.

    55      * @return An instance of CMTPImageDpThumbnailCreator.

    56      */

    57     static CMTPImageDpThumbnailCreator* NewL();

    58 

    59     /**

    60      * C++ destructor.

    61      */

    62     ~CMTPImageDpThumbnailCreator();

    63     

    64 public:

    65 

    66     /**

    67      * Gets a thumbnail from the image.

    68      * @since S60 3.2

    69      * @param aSession, Reference to file server.

    70      * @param aFileName, Name of the image file. Caller must ensure that the referenced object exists until the asynchronous call is completed.

    71      * @param aThumbName, Name of the thumbnail file to be created. Caller must ensure that the referenced object exists until the asynchronous call is completed.

    72      * @param aGetThumbnailStatus, status when 

    73      */

    74     void GetThumbnailL(const TDesC& aFileName, CMTPTypeOpaqueData& aThumbName, TInt& result);

    75 

    76 

    77     void ClearThumbnailData();

    78     CThumbnailManager*  GetThumbMgr() { return iThumbMgr;}

    79 

    80 private: // From MThumbnailManagerObserver

    81     void ThumbnailReady( TInt aError, MThumbnailData& aThumbnail, TThumbnailRequestId aId );

    82     void ThumbnailPreviewReady( MThumbnailData& aThumbnail, TThumbnailRequestId aId );

    83 

    84 private: // From CActive

    85     void DoCancel();

    86     void RunL();

    87     TInt RunError(TInt aError);    

    88  

    89 private:

    90     void EncodeImageL();    

    91     /**

    92      * Scales the image as a thumbnail size.

    93      * @since S60 3.2

    94      * @param None.

    95      * @return None.

    96      */

    97 #ifdef MTPTHUMBSCALING

    98     void ScaleBitmap();

    99 #endif

   100     void QueueThumbCreationL( const TDesC& aFileName );

   101     void CreateThumbL(const TDesC& aFileName );

   102     void GetThumbL(const TDesC& aFileName);

   103 

   104 private:

   105     /**

   106      * Default C++ constructor. Not used.

   107      */

   108     CMTPImageDpThumbnailCreator();

   109 

   110     /**

   111      * 2nd phase constructor.

   112      */

   113     void ConstructL();

   114 

   115 private:

   116     /**

   117     FLOGGER debug trace member variable.

   118     **/

   119     __FLOG_DECLARATION_MEMBER_MUTABLE;

   120     

   121     enum{

   122         EIdle,

   123         EGetting,

   124         EGetted,

   125         EScaling,

   126         EEncoding}          iState;

   127     TThumbnailRequestId     iCurrentReq;

   128     TInt*                   iCreationErr;

   129     CFbsBitmap*             iBitmap;

   130     CImageEncoder*          iImgEnc;

   131 #ifdef MTPTHUMBSCALING

   132     CBitmapScaler*          iScaler;

   133 #endif

   134     HBufC8*                 iData;

   135     CThumbnailManager*      iThumbMgr;

   136     CThumbnailObjectSource* iObjectSource;

   137     CMTPTypeOpaqueData*     iBuffer;             //not owned

   138     CActiveSchedulerWait*   iActiveSchedulerWait;

   139     };

   140 

   141 #endif // CMTPIMAGEDPTHUMBNAILCREATOR_H