Equivalent of “Invalidate Rect” / “WM_PAINT” in X11

Question

I\'m Porting some code from Windows to XLib. In the windows code, I can force a redraw by calling InvalidateRect and then handling the corresponding WM_P

Answer 1

To expand slightly on the useful answers given by BЈовић,

With raw Xlib you can draw at any time in a single thread, because every Xlib function specifies the full display, window, and context. AFAIK, with multithreading all bets are off.

You also must have an Expose event handler, and select for those events, if you're in a desktop environment. And it won't hurt to have one even if you're writing a full screen program.

Most toolkits are not as flexible and only draw in a designated event handler (but much nicer to use in many other ways) and have some equivalent to the Windows InvalidateRect. In raw Xlib you get the same effect by sending yourself an Expose event. Doing so won't lead to any real performance problems and will make the code more understandable by other programmers, and easier to port, so you might as well.

There are also XClearArea and XClearWindow functions which will generate Expose events for you, but they first erase part/all with the background color, which might lead to flickering.

With OpenGL it gets a bit more complicated because you have to work with GLX as well. I have a very simple OpenGL/Xlib program online at http://cs.anu.edu.au/~hugh.fisher/3dteach/ which might be useful as an example.