    # File lib/compass/sass_extensions/sprites/sprite_map.rb, line 35
            def initialize(sprites, path, name, context, kwargs)
              @image_names = sprites
              @path = path
              @name = name
              @kwargs = kwargs
              @kwargs['cleanup'] ||= Sass::Script::Bool.new(true)
              @kwargs['layout'] ||= Sass::Script::String.new('vertical')
              @images = nil
              @width = nil
              @height = nil
              @engine = nil
              @evaluation_context = context
              validate!
              compute_image_metadata!
            end