1 /*

     2 * Copyright (c) 2006-2007 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:   Base class for tasks which load thumbnails

    15 *

    16 */

    17 

    18 

    19 

    20 #ifndef C_GLXTNLOADTHUMBNAILTASK_H

    21 #define C_GLXTNLOADTHUMBNAILTASK_H

    22 

    23 #include "glxtntask.h"

    24 #include "glxtnstd.h"

    25 

    26 // Forward declarations

    27 class CGlxtnFileInfo;

    28 class CGlxtnFileUtility;

    29 class CFbsBitmap;

    30 class CImageDecoder;

    31 class TGlxThumbnailRequest;

    32 

    33 /**

    34  * Base class for tasks which load thumbnails.

    35  *

    36  * @author Dan Rhodes

    37  * @ingroup glx_thumbnail_creator

    38  */

    39 NONSHARABLE_CLASS( CGlxtnLoadThumbnailTask ) : public CGlxtnClientTask

    40     {

    41 public:

    42     /**

    43     * Destructor.

    44     */

    45     ~CGlxtnLoadThumbnailTask();

    46 

    47 protected:  // From CGlxtnTask

    48 	void DoCancel();

    49 

    50 protected:

    51     /**

    52     * C++ default constructor.

    53     * @param aId Task type ID.

    54     * @param aRequestInfo Parameters for the thumbnail request.

    55     * @param aFileUtility File utility for use by the task.

    56     * @param aClient Client initiating the request.

    57     */

    58     CGlxtnLoadThumbnailTask( const TGlxtnTaskId& aId,

    59                             const TGlxThumbnailRequest& aRequestInfo,

    60                             CGlxtnFileUtility& aFileUtility,

    61                             MGlxtnThumbnailCreatorClient& aClient );

    62     /**

    63     * Symbian 2nd phase constructor.

    64     * @param aBitmapHandle Handle to bitmap in which to store the thumbnail.

    65     */

    66     void ConstructL( TInt aBitmapHandle );

    67 

    68     /**

    69     * Start asynchronous loading.

    70     * @param aStatus Request status for the asynchronous operation.

    71     * @return ETrue if an asynchronous operation has been started.

    72     */

    73     TBool LoadThumbnailL( TRequestStatus& aStatus );

    74     /**

    75     * Create bitmap from loaded thumbnail data.

    76     * @param aStatus Request status for the asynchronous operation.

    77     * @return ETrue if an asynchronous operation has been started.

    78     */

    79     TBool HandleLoadedThumbnailL( TRequestStatus& aStatus );

    80     /**

    81     * Start asynchronous decoding.  iDecoder should point to a valid decoder.

    82     * @param aStatus Request status for the asynchronous operation.

    83     * @param aScaleBitmap If true, scale the loaded bitmap close to

    84     *       requested size.

    85     */

    86     void DecodeThumbnailL( TRequestStatus& aStatus, TBool aScaleBitmap );

    87 

    88 protected:

    89     enum TGeneratorState

    90         {

    91         EStateFetchingUri, EStateLoading, EStateDecodingThumbnail,

    92         EStateDecodingImage, EStateScaling, EStateFiltering

    93         };

    94 

    95     /** File utility */

    96     CGlxtnFileUtility& iFileUtility;

    97 	/** Current state for task state machine */

    98     TGeneratorState iState;

    99     /** File information for item to thumbnail (owned) */

   100     CGlxtnFileInfo* iInfo;

   101     /** Requested thumbnail size */

   102     TSize iRequestedSize;

   103     /** Thumbnail image data (owned) */

   104     HBufC8* iThumbData;

   105     /** Thumbnail data format */

   106     TGlxImageDataFormat iFormat;

   107     /** Decoder to decode the thumbnail data (owned) */

   108     CImageDecoder* iDecoder;

   109     /** Bitmap to decode image into (owned) */

   110     CFbsBitmap* iThumbnail;

   111     /** DRM allowed flag passed from thumbnail request */

   112     TBool iDrmAllowed;

   113     };

   114 

   115 #endif // C_GLXTNLOADTHUMBNAILTASK_H