1 /*

     2 * Copyright (c) 2005 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:

    15 *

    16 */

    17 

    18 

    19 #include <e32std.h>

    20 #include "lcdgdrvutil.h"

    21 

    22 /**

    23  * Calculate rational increment stepping in positive y direction.

    24  *

    25  *@param aDx difference in x coordinates of edge end points

    26  *@param aDy difference in y coordinates of edge end points, always positive (y sorted vertices)

    27  *@return aIx integer increment

    28  *@return aIf positive fractional increment with denominator aDy

    29  *

    30  */

    31 void Increment(TInt& aIx, TInt& aIf, TInt aDx, TInt aDy)

    32 {

    33     ASSERT(aDy > 0);

    34 

    35     TInt ip = aDx / aDy;

    36     TInt fp = aDx % aDy;

    37 

    38     if (fp < 0)

    39     {

    40         aIx = ip - 1;

    41         aIf = fp + aDy;

    42     }

    43     else

    44     {

    45         aIx = ip;

    46         aIf = fp;

    47     }

    48 }

    49 

    50 void Increment(TInt64& aIx, TInt64& aIf, TInt64 aDx, TInt64 aDy)

    51 {

    52     ASSERT(aDy > 0);

    53 

    54     TInt64 ip = aDx / aDy;

    55     TInt64 fp = aDx % aDy;

    56 

    57     if (fp < 0)

    58     {

    59         aIx = ip - 1;

    60         aIf = fp + aDy;

    61     }

    62     else

    63     {

    64         aIx = ip;

    65         aIf = fp;

    66     }

    67 }

    68