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I am going to port some screenshot grabbing code (C++) for linux to osx. The current solution run graphical applications in xvfb and then use xlib to grab screenshots from the display. (That will also support if we are running without xvfb).
So as I understood osx is moving away from X11 so my question is what to use besides xlib to implement it now ? I have found Quartz Display Services. Is that what makes sense to use now ? Will that work with xvfb ?
Yes, you will be able to call functions like
CGDisplayCreateImage(documentation linked for you) by linking the Application Services framework to your C++ tool.