+SCM box_to_scheme_lines (Box b);
+Box ly_FT_get_unscaled_indexed_char_dimensions (FT_Face const &face, size_t signed_idx);
+Box ly_FT_get_glyph_outline_bbox (FT_Face const &face, size_t signed_idx);
+SCM ly_FT_get_glyph_outline (FT_Face const &face, size_t signed_idx);
+