Re: redisplay system of emacs

[Jan Djärv]

David Kastrup skrev:

> I don't think that the performance in partly obscured windows is really
> that important.

No, it isn't.  But if you can get info about exactly what parts needs to be 
updated, maybe redisplay could do less work.  But the main point is that if 
you use double buffering (i.e. first render in an off-screen pixmap, and then 
copy the pixmap to the X window in one go), you can use a very crude 
redisplay, since you always copy from an up-to-date copy.  No need to worry 
about flickering.

        Jan D.