class PDF::Reader::PageLayout

def initialize(runs, mediabox)
  raise ArgumentError, "a mediabox must be provided" if mediabox.nil?
  @runs    = merge_runs(runs)
  @mean_font_size   = mean(@runs.map(&:font_size)) || 0
  @mean_glyph_width = mean(@runs.map(&:mean_character_width)) || 0
  @page_width  = mediabox[2] - mediabox[0]
  @page_height = mediabox[3] - mediabox[1]
  @x_offset = @runs.map(&:x).sort.first
  @current_platform_is_rbx_19 = RUBY_DESCRIPTION =~ /\Arubinius 2.0.0/ &&
                                  RUBY_VERSION >= "1.9.0"
end