How to resize a pixmap with XLib?

Question

I'm using a pixmap as a window's backup in order to restore it under expose events. When the window is resized, must I resize the backup pixmap?

If so, what is the best way? Create a new pixmap with the new size?

Answer 1

Yes you are right.

If the window is resized to a smaller size you just clip it.

If the window is bigger you allocate again to the new size.

My advice would also be to look at

• xcb which replaces xlib at the moment
• xshm functions for faster performance
• Xrender/cairo/clutter that may do what you want already