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diff --git a/include/gal/definitions.h b/include/gal/definitions.h
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+++ b/include/gal/definitions.h
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+/*
+ * This program source code file is part of KICAD, a free EDA CAD application.
+ *
+ * Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
+ * Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
+ *
+ * Macro definitions
+ *
+ * This program 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,
+ * 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, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef DEFINITIONS_H_
+#define DEFINITIONS_H_
+
+/// Swap the variables if a condition is met.
+#define SWAP( varA, condition, varB ) if( varA condition varB ) { double tmp = varA; varA = varB; \
+                                                                  varB = tmp; }
+
+namespace KIGFX
+{
+/**
+ * RENDER_TARGET: Possible rendering targets
+ */
+enum RENDER_TARGET
+{
+    TARGET_CACHED = 0,      ///< Main rendering target (cached)
+    TARGET_NONCACHED,       ///< Auxiliary rendering target (noncached)
+    TARGET_OVERLAY,         ///< Items that may change while the view stays the same (noncached)
+    TARGETS_NUMBER          ///< Number of available rendering targets
+};
+} // namespace KIGFX
+
+#endif /* DEFINITIONS_H_ */