png.rb in prawn-0.15.0

- old
+ new

@@ -15,9 +15,11 @@
   module Images
     # A convenience class that wraps the logic for extracting the parts
     # of a PNG image that we need to embed them in a PDF
     #
     class PNG < Image
+      # @group Extension API
+
       attr_reader :palette, :img_data, :transparency
       attr_reader :width, :height, :bits
       attr_reader :color_type, :compression_method, :filter_method
       attr_reader :interlace_method, :alpha_channel
       attr_accessor :scaled_width, :scaled_height