# File lib/compass/sass_extensions/sprites/layout_methods.rb, line 84
        def calculate_smart_positions
          fitter = ::Compass::SassExtensions::Sprites::RowFitter.new(@images)
          current_y = 0
          fitter.fit!.each do |row|
            current_x = 0
            row.images.each_with_index do |image, index|
              image.left = current_x
              image.top = current_y
              current_x += image.width
            end
            current_y += row.height
          end
          @width = fitter.width
          @height = fitter.height
        end