Media box (#25)

* Handle case where MediaBox is a reference

lib/pdf/core/page.rb

@@ -61,7 +61,11 @@ def imported_page?
 
       alias __dimensions dimensions if method_defined? :dimensions
       def dimensions
-        return inherited_dictionary_value(:MediaBox) if imported_page?
+        if imported_page?
+          media_box = inherited_dictionary_value(:MediaBox)
+          return media_box.data if media_box.is_a?(PDF::Core::Reference)
+          return media_box
+        end
 
         coords = PDF::Core::PageGeometry::SIZES[size] || size
         [0, 0] +

spec/prawn/templates_spec.rb

@@ -238,6 +238,17 @@
         expect(hash[hash.trailer[:Info]].keys.include?(k)).to eq true
       end
     end
+
+    it 'returns correct dimensions when :MediaBox is a reference' do
+      filename = "#{DATADIR}/pdfs/page_with_mediabox_reference.pdf"
+      pdf = Prawn::Document.new(template: filename)
+
+      # expect the inherited value to be a reference
+      expect(pdf.state.page.send(:inherited_dictionary_value, :MediaBox)).to be_a PDF::Core::Reference
+
+      # expect dimensions to come back as an array
+      expect(pdf.state.page.dimensions).to be_a Array
+    end
   end
 
   describe 'Document#start_new_page with :template option' do