}
    else if (orig == TILE_DNGN_CLOSED_DOOR || orig == TILE_DNGN_OPEN_DOOR)
    {
        ASSERT(special_flv >= 0 && special_flv <= 3);
        (*tile) = orig + special_flv;

            if (bazaar && env.grid_colours[x][y] == baz_col &&

            if (grd[x][y] == DNGN_CLOSED_DOOR || grd[x][y] == DNGN_OPEN_DOOR)
            {
                // Check for horizontal gates.
                bool door_left = (x > 0 && grd[x-1][y] == grd[x][y]);
                bool door_right = (x < GXM - 1 && grd[x+1][y] == grd[x][y]);
                bool door_up = (y > 0 && grd[x][y-1] == grd[x][y]);
                bool door_down = (y < GYM - 1 && grd[x][y+1] == grd[x][y]);
                if ((door_left || door_right) && !door_up && !door_down)
                {
                    int target;
                    if (door_left && door_right)
                        target = TILE_DNGN_GATE_CLOSED_MIDDLE;
                    else if (door_left)
                        target = TILE_DNGN_GATE_CLOSED_RIGHT;
                    else
                        target = TILE_DNGN_GATE_CLOSED_LEFT;
                    // NOTE: this requires that closed gates and open gates
                    // are positioned in the tile set relative to their
                    // door counterpart.
                    env.tile_flavor[x][y].special =
                        target - TILE_DNGN_CLOSED_DOOR;
                }
                else
                {
                    env.tile_flavor[x][y].special = 0;
                }
            }
            else if (bazaar && env.grid_colours[x][y] == baz_col &&

gate_closed_left DNGN_GATE_CLOSED_LEFT
gate_closed_middle DNGN_GATE_CLOSED_MIDDLE
gate_closed_right DNGN_GATE_CLOSED_RIGHT

gate_open_left DNGN_GATE_OPEN_LEFT
gate_open_middle DNGN_GATE_OPEN_MIDDLE
gate_open_right DNGN_GATE_OPEN_RIGHT