1 /*

     2 * Copyright (c) 2010 Ixonos Plc.

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the "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 * Ixonos Plc

    14 *

    15 * Description:  

    16 * Resampling framework for YUV 4.2.0.

    17 *

    18 */

    19 

    20 

    21 

    22 #ifndef CTRSCALER_H

    23 #define CTRSCALER_H

    24 

    25 

    26 // INCLUDES

    27 #include <e32base.h>

    28 #include "ctrcommon.h"

    29 

    30 

    31 // Scaler operations

    32 enum EResamplingOpereation

    33     {

    34     EOperationNone,

    35     EDoubleSize,          // Resize to 200%

    36     EUpSampling,          // Resize to 101% or more

    37     EOperationCopy,       // No resize (100%)

    38     EOperationCopyWithBB, // No resize, add black borders

    39     EDownSampling,        // Resize to 99% or less

    40     EHalveSize,           // Resize to 50%

    41     EUpDownSampling       // Resize with strech    

    42     };

    43 

    44 // Scaler class, supports resampling operations with YUV 4.2.0 format;

    45 NONSHARABLE_CLASS(CTRScaler) : public CBase

    46     {

    47     public:

    48         static CTRScaler* NewL();

    49 

    50         // Destructor

    51         ~CTRScaler();

    52 

    53     public:

    54         void Scale();

    55 

    56         // Sets operations

    57         void SetScalerOptionsL( TPtr8& aSrc, TPtr8& aTrg, TSize& aSrcSize, TSize& aTrgSize );

    58         

    59         // Checks if aspect ratio is wide

    60         TBool IsWideAspectRatio(TSize aSize);        

    61         

    62         // Calculates intermediate resolution for use with black boxing

    63         TBool GetIntermediateResolution(TSize aSrcSize, TSize aTrgSize, TSize& aTargetResolution, TSize& aBlackBoxing);

    64         

    65         // Returns a time estimate of how long it takes to resample a frame

    66         TReal EstimateResampleFrameTime(const TTRVideoFormat& aInput, const TTRVideoFormat& aOutput);

    67 

    68     private:

    69         CTRScaler();

    70 

    71         // Second phase constructor

    72         void ConstructL();

    73 

    74         // Resampling operations

    75         void ResampleBilinear(TSize& aSrcSize, TSize& aTrgSize, TSize& aBlackBoxing);

    76         void ResampleHalve(TSize& aSrcSize, TSize& aTrgSize, TSize& aBlackBoxing);

    77         void ResampleDouble(TSize& aSrcSize, TSize& aTrgSize);

    78         

    79         // Called when resizing to less than 50% of the original size

    80         void DoHalveAndBilinearResampleL();

    81         

    82         // No resampling, copy frame and add black borders.

    83         void CopyWithBlackBoxing(TSize& aSrcSize, TSize& aTrgSize, TSize& aBlackBoxing);

    84 

    85     private:

    86         // Source buffer

    87         TUint8* iSrc;

    88 

    89         // Destination buffer

    90         TUint8* iTrg;

    91 

    92         // Source resolution

    93         TSize iSrcSize; 

    94 

    95         // Target resolution

    96         TSize iTrgSize;

    97         

    98         // Resampling operation

    99         TInt iOperation;

   100 

   101         // Trg data size

   102         TUint iTrgDataSize;

   103         

   104         // Initial src ptr

   105         TUint8* iSrcInit;

   106 

   107         // Initial trg ptr

   108         TUint8* iTrgInit;

   109 

   110         // Scale X

   111         TInt iScaleXInt;

   112 

   113         // Scale Y

   114         TInt iScaleYInt;

   115         

   116         TPtr8* iTrgBuffer;

   117         

   118         // For storing width/height of black border area

   119         TSize iBlackBoxing;

   120         

   121     };

   122 

   123 

   124 

   125 

   126 #endif