diff --git a/common/rfb/ColourMap.h b/common/rfb/ColourMap.h
new file mode 100644
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+++ b/common/rfb/ColourMap.h
@@ -0,0 +1,34 @@
+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * 
+ * This 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 software 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 software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+#ifndef __RFB_COLOURMAP_H__
+#define __RFB_COLOURMAP_H__
+namespace rfb {
+  struct Colour {
+    Colour() : r(0), g(0), b(0) {}
+    Colour(int r_, int g_, int b_) : r(r_), g(g_), b(b_) {}
+    int r, g, b;
+    bool operator==(const Colour& c) const {return c.r == r && c.g == g && c.b == b;}
+    bool operator!=(const Colour& c) const {return !(c == *this);}
+  };
+
+  class ColourMap {
+  public:
+    virtual void lookup(int index, int* r, int* g, int* b)=0;
+  };
+}
+#endif