new cygwin/x11 and backingstore
Jon TURNEY
jon.turney@dronecode.org.uk
Mon Feb 8 14:42:00 GMT 2010
On 04/02/2010 15:25, anne crespy wrote:
> Hi,
>
> Before updating Cygwin/X with the new version (X11R7) I launched Xwin with this
> command :
>
> XWin -multiwindow -clipboard -silent-dup-error +bs&
>
> and the backingStore option worked correctly in a graphic window (built with
> tcl/tk8.4 and Xlib).
You were just lucky :-)
The backing store attribute is a hint; the server doesn't have to
honour a request to use backing store.
Note that even if you have an X server which does provide backingstore, the
server doesn't have to provide an unlimited amount of memory for it, so it may
discard backingstore at any time.
Any X client which *requires* backingstore to work is broken, not correctly
redrawing windows when they are exposed.
See [1]
> Now, it doesn't work. When the graphic window is overlapped its contents is
> corrupted by the top window.
>
> I didn't have this problem with the beta-version in november 2009.
>
> What have changed since?
backingstore is implemented in terms of Composite in the X.Org server since X
server 1.5.0
Unfortunately, we have had to disable Composite in the current X server due to
crashes.
If/when these problems with Composite are fixed, things may work a little
better...
[1] http://www.mail-archive.com/xorg@lists.freedesktop.org/msg04440.html
--
Jon TURNEY
Volunteer Cygwin/X X Server maintainer
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