docs: function RenderTexture (opts) {
      RenderTexture.superclass.constructor.call(this, opts)
  
      var width = opts.width,
          height = opts.height
  
      evt.addPropertyListener(this, 'contentSize', 'change', this._resizeCanvas.bind(this))
  
      this.canvas = document.createElement('canvas')
      this.context = this.canvas.getContext('2d')
  
      var atlas = new TextureAtlas({canvas: this.canvas})
      this.sprite = new Sprite({textureAtlas: atlas, rect: {origin: ccp(0, 0), size: {width: width, height: height}}})
  
      this.contentSize = geo.sizeMake(width, height)
      this.addChild(this.sprite)
      this.anchorPoint = ccp(0, 0)
      this.sprite.anchorPoint = ccp(0, 0)
  
  }