# File lib/prawn/font/ttf.rb, line 115
      def italic_angle
        @italic_angle ||= if @ttf.postscript.exists?
          raw = @ttf.postscript.italic_angle
          hi, low = raw >> 16, raw & 0xFF
          hi = -((hi ^ 0xFFFF) + 1) if hi & 0x8000 != 0
          "#{hi}.#{low}".to_f
        else
          0
        end
      end