class PDF::Inspector::ExtGState

def initialize
  @extgstates = []
end

def page=(page)
  page.graphic_states.each do |_label, stream|
    @extgstates << {
      opacity: stream[:ca],
      stroke_opacity: stream[:CA],
      soft_mask: stream[:SMask],
      blend_mode: stream[:BM]
    }
  end
end