1 /*

     2 * Copyright (c) 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:  Camera Bitmap Scaler class and observer interface.

    15 *

    16 */

    17 

    18 

    19 #ifndef CAM_BITMAPSCALER_H

    20 #define CAM_BITMAPSCALER_H

    21 

    22 // ===========================================================================

    23 // Included headers

    24 #include <e32std.h>

    25 #include <f32file.h>

    26 

    27 // ===========================================================================

    28 // Forward declarations

    29 class CFbsBitmap;

    30 class CBitmapScaler;

    31 

    32 // ===========================================================================

    33 // Classes

    34 

    35 /**

    36 * Interface for Camera Bitmap Scaler Observers

    37 */

    38 class MCamBitmapScalerObserver

    39   {

    40   public:

    41   

    42     /**

    43     * Notify observer that the bitmap scaling has finished.

    44     * @param aStatus Status code describing the success of the operation.

    45     *        KErrNone if all went as planned.

    46     * @param aBitmap Scaled bitmap. NULL if errors in scaling.

    47     */

    48     virtual void BitmapScaled( TInt aStatus, const CFbsBitmap* aBitmap ) = 0;

    49 

    50   };

    51   

    52 

    53 /**

    54 * Image Decoder class

    55 */

    56 class CCamBitmapScaler : public CActive

    57   {

    58   // =======================================================

    59   public:

    60 

    61     /**

    62     * 2-phase constructor.

    63     */

    64     static CCamBitmapScaler* NewL( MCamBitmapScalerObserver& aObserver );

    65     

    66     /**

    67     * Destructor.

    68     */

    69     virtual ~CCamBitmapScaler();

    70 

    71   // -------------------------------------------------------

    72   // From CActive

    73   protected: 

    74 

    75     /**

    76     * Called when Cancel is requested and this AO is active.

    77     * @see CActive

    78     */

    79     virtual void DoCancel();

    80 

    81     /**

    82     * We get notified of the scaling success by a call to RunL

    83     * when scaling finishes.

    84     * @see CActive

    85     */

    86     virtual void RunL();

    87     

    88     /**

    89     * If a leave occurs in RunL, RunError gets called by the 

    90     * Active Scheduler.

    91     * @param aError Leave code from RunL.

    92     * @see CActive

    93     */

    94     virtual TInt RunError( TInt aError );

    95 

    96   // -------------------------------------------------------

    97   public:

    98 

    99     void InitScalingL( const TSize&        aTargetSize,

   100                        const TDisplayMode& aTargetDisplayMode,

   101                              TBool         aMaintainAspect );

   102 

   103     void StartScaling( CFbsBitmap& aSourceBitmap );

   104 

   105   private:

   106 

   107     /**

   108     * 2nd phase constructor.

   109     */

   110     void ConstructL();

   111 

   112     /**

   113     * 1st phase constructor.

   114     * Cannot leave.

   115     */

   116     CCamBitmapScaler( MCamBitmapScalerObserver& aObserver );

   117 

   118   // =======================================================

   119   // Data

   120   private:

   121 

   122     MCamBitmapScalerObserver& iObserver;

   123     CBitmapScaler*            iScaler;

   124     CFbsBitmap*               iScaledBitmap;

   125     TBool                     iMaintainAspect;

   126     

   127   // =======================================================

   128   };

   129 

   130 // ===========================================================================

   131 #endif // CAM_BITMAPSCALER_H

   132 

   133 // end of file