image_compare.rb in capybara-screenshot-diff-0.10.0

- old
+ new

@@ -1,10 +1,12 @@
 require 'chunky_png'
 
 module Capybara
   module Screenshot
     module Diff
+      # Compare two images and determine if they are equal, different, or within som comparison
+      # range considering color values and difference area size.
       class ImageCompare
         include ChunkyPNG::Color
 
         attr_reader :annotated_new_file_name, :annotated_old_file_name, :new_file_name,
             :old_file_name
@@ -19,13 +21,14 @@
           @annotated_old_file_name = "#{new_file_name.chomp('.png')}_0.png~"
           @annotated_new_file_name = "#{new_file_name.chomp('.png')}_1.png~"
           reset
         end
 
+        # Resets the calculated data about the comparison with regard to the "new_image".
+        # Data about the original image is kept.
         def reset
           @max_color_distance = @color_distance_limit ? 0 : nil
           @left = @top = @right = @bottom = nil
-          @_old_filesize = nil
         end
 
         # Compare the two image files and return `true` or `false` as quickly as possible.
         # Return falsish if the old file does not exist or the image dimensions do not match.
         def quick_equal?