将背景图像设置为织物画布

Question

如何将背景图像设置为织物画布而不是setbackground()功能？

zcanvas.setBackgroundImage(lurl,
  zcanvas.renderAll.bind(zcanvas),{
  height: renderableHeight, 
  width: renderableWidth,
  top:xStart,    
  left:yStart
});