lib/chunky_png.rb in chunky_png-1.3.7 vs lib/chunky_png.rb in chunky_png-1.3.8

@@ -119,9 +119,14 @@
 
   # Exception that is raised if an expectation fails.
   class OutOfBounds < ChunkyPNG::ExpectationFailed
   end
 
+  # Exception that is raised when requesting the DPI of a PNG that doesn't
+  # specify the units of its physical pixel dimensions.
+  class UnitsUnknown < ChunkyPNG::Exception
+  end
+
   def self.force_binary(str)
     str.respond_to?(:force_encoding) ? str.force_encoding('BINARY') : str
   end
   
   # Empty byte array. This basically is an empty string, but with the encoding