#ifdef __cplusplus 
#ifndef BEGIN_GTK_CANVAS_DECLS
#define BEGIN_GTK_CANVAS_DECLS extern "C" {
#define END_GTK_CANVAS_DECLS }
#endif
#else
#ifndef BEGIN_GTK_CANVAS_DECLS
#define BEGIN_GTK_CANVAS_DECLS
#define END_GTK_CANVAS_DECLS
#endif
#endif
