XImage - how to resize?

I've got a XImage retrieved by XShmGetImage function. How can I res开发者_运维百科ize it? Is there any function in X11 libraries to perform this operation or I need to use external library?

You have to create a new one with the new size. An external library can't help because you would need the X server itself to cooperate.

You can use the XRENDER extension.