# File lib/pdf/writer.rb, line 1047
1047:   def font_descender(size = nil)
1048:     size = @font_size if size.nil? or size <= 0
1049: 
1050:     select_font("Helvetica") if @fonts.empty?
1051:     hi = @fonts[@current_font].fontbbox[1].to_f
1052:     (size * hi / 1000.0)
1053:   end