c_gdk_window_coords_to_parent

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GdkWindow* window, gdouble x, gdouble y, gdouble* parentX, gdouble* parentY) c_gdk_window_coords_to_parent;

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