1 /*

     2 * Copyright (c) 2004 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:    Image Transforms subsystem.

    15 *

    16 */

    17 

    18 

    19 

    20 

    21 #ifndef CVTIMAGESCALERIMPLNEAREST_H

    22 #define CVTIMAGESCALERIMPLNEAREST_H

    23 

    24 // INCLUDE FILES

    25 

    26 #include "CVtImageScalerImpl.h"

    27 

    28 // CLASS DECLARATIONS

    29 

    30 /**

    31 *  Nearest neigbour image scaling implementation.

    32 *

    33 *  @lib videosource.lib

    34 */

    35 class CVtImageScalerImplNearest : public CVtImageScalerImpl

    36     {

    37     private: // from CVtImageScalerImpl

    38 

    39         /**

    40         * From CVtImageScalerImpl. Check CVtImageScalerImpl for description.

    41         */

    42         TInt Scale( TBool& aContinue );

    43 

    44     private:

    45 

    46         /**

    47         * Validate given parameters.

    48         */

    49         void ValidateSourceTargetL(

    50             const CVtImage& aSource,

    51             CVtImage& aTarget );

    52 

    53         /**

    54         * Initializes internal variables for scaling.

    55         */

    56         void Initialize();

    57 

    58         /**

    59         * Scales images in displaymode EColor4K.

    60         */

    61         void Scale4K(

    62             const TUint16* aSrcPtr,

    63             TUint32 aSrcPitch,

    64             TUint16* aTrgPtr,

    65             TUint32 aTrgWidth,

    66             TUint32 aTrgHeight,

    67             TUint32 aDx,

    68             TUint32 aDy );

    69 

    70         /**

    71         * Scales images in displaymode EColor64K.

    72         */

    73         void Scale64K(

    74             const TUint16* aSrcPtr,

    75             TUint32 aSrcPitch,

    76             TUint16* aTrgPtr,

    77             TUint32 aTrgWidth,

    78             TUint32 aTrgHeight,

    79             TUint32 aDx,

    80             TUint32 aDy );

    81 

    82         /**

    83         * Scales images in displaymode EColor16M.

    84         */

    85         void Scale16M(

    86             const TUint8* aSrcPtr,

    87             TUint32 aSrcPitch,

    88             TUint8* aTrgPtr,

    89             TUint32 aTrgWidth,

    90             TUint32 aTrgHeight,

    91             TUint32 aTrgPitch,

    92             TUint32 aDx,

    93             TUint32 aDy );

    94 

    95         /**

    96         * Scales images in displaymodes EColor16MU and EColor16MA.

    97         */

    98         void Scale16MU16MA(

    99             const TUint32* aSrcPtr,

   100             TUint32 aSrcPitch,

   101             TUint32* aTrgPtr,

   102             TUint32 aTrgWidth,

   103             TUint32 aTrgHeight,

   104             TUint32 aDx,

   105             TUint32 aDy );

   106 

   107         /**

   108         * Fast scaling when target is double the source size for

   109         * 4K and 64K display modes.

   110         */

   111         void Scale2x4K64K();

   112 

   113         /**

   114         * Fast scaling when target is double the source size for 16M

   115         * display mode.

   116         */

   117         void Scale2x16M();

   118 

   119         /**

   120         * Fast scaling when target is double the source size for 16MU and 16MA

   121         * display modes.

   122         */

   123         void Scale2x16MU16MA();

   124 

   125     private:

   126 

   127         // Target width ratio to source width

   128         TUint32 iU;

   129 

   130         // Target height ratio to source height

   131         TUint32 iV;

   132     };

   133 

   134 #endif // CVTIMAGESCALERIMPLNEAREST_H

   135 

   136 // End of File

   137 

   138