4 // Copyright (C) 2009 Matt McCutchen
6 // This program is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU General Public License
8 // as published by the Free Software Foundation; either version 2
9 // of the License, or (at your option) any later version.
11 // This program is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with this program; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 #include "aatriangle.hpp"
22 int AATriangle::vertical_flip(int dir) {
23 int direction = dir & AATriangle::DIRECTION_MASK;
24 direction = 3 - direction;
25 int deform = dir & AATriangle::DEFORM_MASK;
27 case AATriangle::DEFORM1:
28 deform = AATriangle::DEFORM2;
30 case AATriangle::DEFORM2:
31 deform = AATriangle::DEFORM1;
37 return (direction | deform);