Initial clone in from local subversion server

Common.h

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+#ifndef __COMMON_H__
+#define __COMMON_H__
+
+#include <SDL.h>
+
+#define GAMEFPS		60
+
+struct Vector
+{
+    float x;
+    float y;
+    float z;
+};
+
+typedef Vector Point;
+
+struct FrameCounter
+{
+    unsigned int curFrame;
+    unsigned int lastTime;
+    SDL_Surface *lastFrame;
+};
+
+/**
+ * @class SharedCanvas2D
+ * @brief A class that allows multiple objects to re-use a single SDL_Surface with reference counting for safe memory usage
+ *
+ * The only thing that might be confusing about this class is that it is just
+ * a container for an SDL_Surface that implements refcounting.
+ */
+
+class SharedCanvas2D
+{
+protected:
+    SDL_Surface *canvas;
+public:
+    SharedCanvas2D();
+    virtual ~SharedCanvas2D();
+    SDL_Surface *getCanvas();
+    virtual int shareCanvas(SharedCanvas2D *obj);
+    virtual int shareCanvas(SDL_Surface *obj);
+    virtual int releaseCanvas();
+};
+
+#endif // __COMMON_H__