void gd_prepare_tile_bitmap(GdCave *cave, Bitmap *bitmap, int scale_down_factor);
void gd_set_tile_bitmap_reference(Bitmap *bitmap);
Bitmap *gd_get_tile_bitmap(Bitmap *bitmap);
void gd_prepare_tile_bitmap(GdCave *cave, Bitmap *bitmap, int scale_down_factor);
void gd_set_tile_bitmap_reference(Bitmap *bitmap);
Bitmap *gd_get_tile_bitmap(Bitmap *bitmap);