More player debugging for butler video-full states.

[dcpomatic.git] / src / lib / position.h

diff --git a/src/lib/position.h b/src/lib/position.h
index f9bd0987cdb5ed3e2688ed63bf0d5cfdbbf1597d..7d424b3acfd38d053fbc44f363652865105c3da4 100644 (file)
--- a/src/lib/position.h
+++ b/src/lib/position.h
@@ -1,19 +1,20 @@
 /*
-    Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
 
-    This program is free software; you can redistribute it and/or modify
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.
 
-    This program is distributed in the hope that it will be useful,
+    DCP-o-matic is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
     You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
 
 */
 
@@ -21,7 +22,7 @@
 #define DCPOMATIC_POSITION_H
 
 /** @struct Position
- *  @brief A position.
+ *  @brief A position (x and y coordinates)
  */
 template <class T>
 class Position
@@ -50,4 +51,25 @@ operator+ (Position<T> const & a, Position<T> const & b)
        return Position<T> (a.x + b.x, a.y + b.y);
 }
 
+template<class T>
+Position<T>
+operator- (Position<T> const & a, Position<T> const & b)
+{
+       return Position<T> (a.x - b.x, a.y - b.y);
+}
+
+template<class T>
+bool
+operator== (Position<T> const & a, Position<T> const & b)
+{
+       return a.x == b.x && a.y == b.y;
+}
+
+template<class T>
+bool
+operator!= (Position<T> const & a, Position<T> const & b)
+{
+       return a.x != b.x || a.y != b.y;
+}
+
 #endif