int is_xwindow() { return type==bmXShmImage || type==bmXImage; }
int is_shared() { return type==bmXvShmImage || type==bmXShmImage; }
int is_unshared() { return type==bmXvImage || type==bmXImage; }
+ int is_zombie() { return cur_bfr()->is_zombie(); }
int set_bg_color(int color);
int invert();