code: func (i *Image) PutVertex(dest []float32, dx, dy, sx, sy float32, bx0, by0, bx1, by1 float32, cr, cg, cb, ca float32) {
  	if i.backend == nil {
  		i.allocate(true)
  	}
  	ox, oy, _, _ := i.region()
  	oxf, oyf := float32(ox), float32(oy)
  	i.backend.restorable.PutVertex(dest, dx, dy, sx+oxf, sy+oyf, bx0+oxf, by0+oyf, bx1+oxf, by1+oyf, cr, cg, cb, ca)
  }
docs: // PutVertices puts the given dest with vertices that can be passed to DrawTriangles.