gcc supports a popular extension called
will not spend a great deal of time on it, except from the user-space
，推荐阅读快连下载安装获取更多信息
甚至还有一些讲究「降本增效」的防窥膜，只蚀刻纵向光栅，导致只能左右防窥、上下或者斜视看过去依然是一览无余的：
While HP’s SureView tech is similar, the amount of customization possible is incredible — and we all have our phones out in public much more than our… HP laptops. It could be perfect for keeping prying eyes off your banking apps, messaging apps and even dating apps.