save_state (PDF::Writer)

          # File lib/pdf/writer.rb, line 1758
    1758:   def save_state
    1759:     PDF::Writer::State.new do |state|
    1760:       state.fill_color        = @current_fill_color
    1761:       state.stroke_color      = @current_stroke_color
    1762:       state.text_render_style = @current_text_render_style
    1763:       state.stroke_style      = @current_stroke_style
    1764:       @state_stack.push state
    1765:     end
    1766:     add_content("\nq")
    1767:   end