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:  Triangle filler.

    15 *

    16 */

    17 

    18 

    19 

    20 #ifndef TMIDTRIANGLEFILLER_H

    21 #define TMIDTRIANGLEFILLER_H

    22 

    23 //  INCLUDES

    24 #include <e32def.h>

    25 

    26 

    27 //  CONSTANTS

    28 const TInt KShift = 8;

    29 

    30 //  MACROS

    31 #define FPDIV( x, y ) ( ( ( x ) << KShift ) / ( y ) )

    32 

    33 

    34 

    35 //  CLASS DEFINITION

    36 /**

    37  * Triangle filler.

    38  *

    39  */

    40 NONSHARABLE_CLASS(TMIDTriangleFiller)    // usually not derived

    41 {

    42 public:     // Constructors and destructors

    43     void Construct(TInt aX1, TInt aY1,

    44                    TInt aX2, TInt aY2,

    45                    TInt aX3, TInt aY3);

    46 

    47 public:     // New methods

    48     void GetNextPixelRun(TBool& aExists, TInt& aScanLine,

    49                          TInt& aStart, TInt& aEnd);

    50 

    51 private:    // New methods

    52 

    53     void ConstructNormalCase();

    54     void ConstructSpecialCaseOne();

    55     void ConstructSpecialCaseTwo();

    56     void ConstructSingleLine();

    57     void SecondHalf();

    58 

    59     inline void SwapPoints(TInt& aX1, TInt& aY1,

    60                            TInt& aX2, TInt& aY2);

    61 

    62 private:    // Data

    63     TInt iX1;

    64     TInt iY1;

    65     TInt iX2;

    66     TInt iY2;

    67     TInt iX3;

    68     TInt iY3;

    69     TInt iRightDelta;

    70     TInt iLeftDelta;

    71     TInt iScanlines;

    72     TInt iSpanStart;

    73     TInt iSpanStop;

    74     TInt iDx12;

    75     TInt iDx23;

    76     TInt iDx13;

    77     TBool iNormalCase;

    78 };

    79 

    80 void TMIDTriangleFiller::SwapPoints(TInt& aX1, TInt& aY1,

    81                                     TInt& aX2, TInt& aY2)

    82 {

    83     TInt temp(aX1);

    84     aX1 = aX2;

    85     aX2 = temp;

    86     temp = aY1;

    87     aY1 = aY2;

    88     aY2 = temp;

    89 };

    90 

    91 #endif // TMIDTRIANGLEFILLER_H

    92 

    93 

    94