Re: redisplay system of emacs

[Jan Djärv]

alin.s skrev:
> You can keep on server side many little windows, and on the client side you
> can keep the image of the screen, and the little windows notifies you what
> part of the image was changed, you update the local bitmap, and when the
> bitmap is created, you send it to the server with only 1 X lib call.
>
> The idea is that you ask the server to tell you what must be refreshed on
> the scree, and you need no more obfuscated internal redisplay.

This is done already, the expose event contains the rectangle that needs to be 
updated.  And if you need more exact information you can use the XDamage 
extension.

What you are describing is basically double buffering.  Since Gtk+ does this 
already, it makes sense for Emacs to go that way too, either by using more 
Gtk+ (we now turn double buffering off), or develop its own.

        Jan D.