    # File lib/rvg/misc.rb, line 106
                    def glyph_metrics(glyph_orientation, glyph)
                        gm = @ctx.shadow.get_type_metrics("a" + glyph + "a")
                        gm2 = @ctx.shadow.get_type_metrics("aa")
                        h = (gm.ascent - gm.descent + 0.5 ).to_i
                        w = gm.width - gm2.width
                        if glyph_orientation == 0 || glyph_orientation == 180
                            [w, h]
                        else
                            [h, w]
                        end
                    end