render.py 文件源码

def transparent_pix(self):

    op = self.ctx.get_operator()
    self.ctx.set_operator(OPERATOR_SOURCE)
    self.ctx.set_source_rgba(*[1, 1, 1, 0.95])
    self.dot(1-self.pix, 1.0-self.pix)
    self.ctx.set_operator(op)