save_state (PDF::Writer)

          # File lib/pdf/writer.rb, line 1695
    1695:   def save_state
    1696:     PDF::Writer::State.new do |state|
    1697:       state.fill_color        = @current_fill_color
    1698:       state.stroke_color      = @current_stroke_color
    1699:       state.text_render_style = @current_text_render_style
    1700:       state.stroke_style      = @current_stroke_style
    1701:       @state_stack.push state
    1702:     end
    1703:     add_content("\nq")
    1704:   end