You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: card.rb
    path of file: ./repos/squib/lib/squib
    
    the code of the file until where you have to start completion: require 'cairo'
require_relative 'graphics/cairo_context_wrapper'

module 
    
    def make_surface(svgfile, backend)
      case backend.downcase.to_sym
      when :memory
        Cairo::ImageSurface.new(@width, @height)
      when :svg
        FileUtils.mkdir_p @deck.dir unless Dir.exist?(@deck.dir)
        Cairo::SVGSurface.new(svgfile, @width, @height)
      else
        Squib.logger.fatal "Back end not recognized: '#{backend}'"
        abort
      end