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: image.rb
    path of file: ./repos/squib/lib/squib/graphics
    
    the code of the file until where you have to start completion: module Squib

  # Cache all pngs we've already loaded
  #
  # :nodoc:
  # @api private
  def cache_load_image(file)
    @img_cache ||= {}
    @img_cache[file] ||= open_png file
  end
  module_function :cache_load_image

  # Open a PNG file, checking magic bytes if it's a real PNG
  # Magic bytes taken from:
  # https://en.wikipedia.org/wiki/List_of_file_signatures
  # :nodoc:
  # @api private
  PNG_MAGIC = [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]
  def open_png(file)
    if PNG_MAGIC == File.read(file, 8).bytes
   
    
    def svg(file, svg_args, box, paint, trans)
      Squib.logger.debug {"Rendering: #{file}, id: #{id} @#{x},#{y} #{width}x#{height}, alpha: #{alpha}, blend: #{blend}, angle: #{angle}, mask: #{mask}"}
      Squib.logger.warn 'Both an SVG file and SVG data were specified' unless file.to_s.empty? || svg_args.data.to_s.empty?
      return if (file.nil? or file.eql? '') and svg_args.data.nil? # nothing specified TODO Move this out to arg validator
      svg_args.data = File.read(file) if svg_args.data.to_s.empty?
      begin
        svg = Rsvg::Handle.new_from_data(svg_args.data)
      rescue Rsvg::Error::Failed
        Squib.logger.error "Invalid SVG data. Is '#{file}' a valid svg file?"
        return
      end