to_s (PDF::Writer::Object::FontDescriptor)

        # File lib/pdf/writer/object/fontdescriptor.rb, line 24
    24:   def to_s
    25:     res = "\n#{@oid} 0 obj\n<< /Type /FontDescriptor\n"
    26:     @options.each do |k, v|
    27:       res << "/#{k} #{v}\n" if %w{Ascent CapHeight Descent Flags ItalicAngle StemV AvgWidth Leading MaxWidth MissingWidth StemH XHeight CharSet}.include?(k)
    28:       res << "/#{k} #{v} 0 R\n" if %w{FontFile FontFile2 FontFile3}.include?(k)
    29:       res << "/#{k} [#{v.join(' ')}]\n" if k == "FontBBox"
    30:       res << "/#{k} /#{v}\n" if k == "FontName"
    31:     end
    32:     res << "\n>>\nendobj"
    33:   end