Re: 3 button mouse (was: Re: [MiNT] X magic)

[Michael Schwingen <rincewind@tubul.dascon.de>]

On Tue, Dec 08, 1998 at 07:42:02PM +0200, Kristoffer Lawson wrote:
> Are you sure this is true? AFAIK X applications redraw the window
> themselves, but X is capable of caching to at least some extent. This was

Correct. You get redraw messages just like in AES. The X server may
implement backing store (to buffer invisible window contents and do a local
redraw when they are exposed), but this does not seem to be used very often.

The X protocol and Xlib are designed so that the events are mostly
asynchronous: most query functions are handled by the Xlib from locally (on
the X application side) cached values, and drawing requests are sent to the
server without waiting for a response, while the server sends the required
events (mouse, redraw etc.).

This also means that you can get an error (bad drawable, invalid parameter
or such) after a lot of other commands are already processed by the X
server.

cu
Michael
-- 
Michael Schwingen, Ahornstrasse 36, 52074 Aachen