Module: PDF::Impose::Ext::Page

Defined in:
lib/pdf/impose/ext.rb

Instance Method Summary collapse

Instance Method Details

#import_page(reader, page_number, dx, dy, width, height, mirror) ⇒ Object 



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# File 'lib/pdf/impose/ext.rb', line 49

def import_page(reader, page_number, dx, dy, width, height, mirror)
  ref = reader.objects.page_references[page_number]
  return unless ref

  object = document.state.store.
           send(:load_object_graph, reader.objects, ref)

  merge_object_resources object

  contents = object.data[:Contents]
  contents = [contents] unless contents.is_a?(Array)

  contents.each do |content|
    content = content.extract_content_stream
    box = object.data[:MediaBox]

    scale = 1.0
    width_ratio = width.to_f / box[2]
    height_ratio = height.to_f / box[3]

    scale = [width_ratio, height_ratio].min

    document.save_graphics_state do
      document.translate dx, dy
      document.scale scale

      if mirror
        document.translate box[2], box[3]
        document.rotate 180
      end

      document.add_content content
    end
  end
end

#merge_object_resources(object) ⇒ Object 



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# File 'lib/pdf/impose/ext.rb', line 29

def merge_object_resources(object)
  object_resources = document.deref(object.data[:Resources])

  object_resources.keys.each do |resource|
    case object_resources[resource]
    when ::Hash then
      resources[resource] ||= {}
      resources[resource].update(object_resources[resource])
    when ::Array then
      resources[resource] ||= []
      resources[resource] |= object_resources[resource]
    when PDF::Core::Reference then
      resources[resource] = object_resources[resource]
    else
      klass = object_resources[resource].class
      abort "unknown resource type #{klass} for #{resource}"
    end
  end
end