dungeon_feature_type grid_appearance(const feature_grid &gr, const coord_def &gc);

    return grid_appearance(grd, gc);
}

    dungeon_feature_type feat = env.grid(gc);
    if (feat == DNGN_SECRET_DOOR)
        feat = grid_secret_door_appearance(gc);

dungeon_feature_type grid_appearance(const feature_grid &gr, const coord_def &gc)
{
    dungeon_feature_type grid = gr(gc);
    if (grid == DNGN_SECRET_DOOR)
        grid = grid_secret_door_appearance(gc);
    return grid;

    return feat;

    opacity_type opacity(const coord_def& p) const;
};
// Provides a compatible set of parameters for use with the
// legacy losight() function.
struct los_param_compat : los_param_base
{
    feature_grid grid;
    bool solid_blocks;
    bool ignore_clouds;
    los_param_compat(const feature_grid& gr, const coord_def& c,
                     bool sb, bool ic);

    dungeon_feature_type feature(const coord_def& p) const;
    unsigned appearance(const coord_def& p) const;

}
/* los_param_compat */
los_param_compat::los_param_compat(const feature_grid& gr, const coord_def& c,
                                   bool sb, bool ic)
    : los_param_base(c), grid(gr), solid_blocks(sb), ignore_clouds(ic)
{
}
dungeon_feature_type los_param_compat::feature(const coord_def& p) const
{
    return grid(trans(p));

unsigned los_param_compat::appearance(const coord_def& p) const
{
    return grid_appearance(grid, trans(p));
}
opacity_type los_param_compat::opacity(const coord_def& p) const
{
    dungeon_feature_type f = feature(p);
    if (grid_is_opaque(f) || solid_blocks && grid_is_solid(f))
        return OPC_OPAQUE;
    else if (!ignore_clouds && is_opaque_cloud(cloud_idx(p)))
        return OPC_HALF;
    else
        return OPC_CLEAR;
}

void losight(env_show_grid &sh, feature_grid &gr,
             const coord_def& center, bool clear_walls_block = false,
             bool ignore_clouds = false);

void losight(env_show_grid &sh, feature_grid &gr,
             const coord_def& center, bool clear_walls_block,
             bool ignore_clouds)
{
    losight(sh, los_param_compat(gr, center, clear_walls_block, ignore_clouds));
}