void blitter_save(drawing *dr, blitter *bl, int x, int y) {}
void blitter_load(drawing *dr, blitter *bl, int x, int y) {}
int print_mono_colour(drawing *dr, int grey) { return 0; }
void blitter_save(drawing *dr, blitter *bl, int x, int y) {}
void blitter_load(drawing *dr, blitter *bl, int x, int y) {}
int print_mono_colour(drawing *dr, int grey) { return 0; }