However, meeting this guarantee can involve substantial video memory or processing overheads, especially when implementing flip semantics for a windowed swap chain or copy semantics for a full-screen swap chain.

• 但是,实现这样的保证会占用大量视频内存或处理系统开销,尤其是在实现有窗口交换链的翻转语义或全屏交换链的复制语义时。