'usage: paste <image:figure> <int:xoffset> <int:yoffset>
<image:ground>
Paste figure image into ground with upper left at given offsets.'

def do_paste(self):

    figure = self.do_pop()
    xoff = int(self.do_pop())
    yoff = int(self.do_pop())
    ground = self.do_pop()
    if (figure.mode == 'RGBA'):
        ground.paste(figure, (xoff, yoff), figure)
    else:
        ground.paste(figure, (xoff, yoff))
    self.push(ground)
