Re: [Qemu-devel] rfb patch and mouse movement

From: "Jim C. Brown" <jbrown106@phreaker.net>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] rfb patch and mouse movement
Date: Mon, 17 Jan 2005 10:18:25 -0500	[thread overview]
Message-ID: <20050117151825.GA5861@jbrown.mylinuxbox.org> (raw)
In-Reply-To: <Pine.LNX.4.58.0501171524420.2732@wgmdd8.biozentrum.uni-wuerzburg.de>

On Mon, Jan 17, 2005 at 03:49:23PM +0100, Johannes Schindelin wrote:
> Hi,
> 
> On Sun, 16 Jan 2005, Jim C. Brown wrote:
> 
> > On Sun, Jan 16, 2005 at 01:41:09PM +0400, Brad Campbell wrote:
> > > G'day all,
> > >
> > > I'm having a few issues at the moment with mouse
> > > calibration under Windows XP.
> >
> > Every OS with mouse support, with the sole exception of ReactOS, has calibration
> > problems. (At least, those OSes I've managed to test.) Why the mouse is
> > perfectly calibrated in ReactOS, I have no idea.
> 
> I have: ReactOS does not do mouse acceleration, thus one tick from the
> mouse always corresponds to one pixel movement on the screen, whereas X11
> on Linux normally accelerates the mouse, i.e. one thick means one pixel
> movement, but 10 ticks mean 20 pixels.
> 

Then, in theory, if we could tell the guest X11 server to not do acceleration,
the problem would go away?

If so, that would also work for a Windows guest, tho the method of execution
would probably be difficult.

> > Does pressing Ctrl-Alt (or Ctrl-Shift??) to ungrab the mouse, then realiging
> > the host and guest pointers, and then regrabing the mouse work? This is what I
> > do w/ my no-sdl patch.
> 
> This doesn't work yet with rfb9, because Ctrl-Alt doesn't alter the state,
> i.e. the mouse updates are still forwarded after pressing Ctrl-Alt, and
> even after a switch to the console or serial.

Is this due to a limitation of VNC (in which case we might say, Ctrl-A Ctrl-A
does the switch), or is it merely due to a lack of support in the code (that
someone else could add easily by adding a few lines of code)?

> 
> I want to rework the auto-calibration, but time's sparse. Also, somebody
> on the list mentioned that he was working on this himself, but he didn't
> answer my emails.
> 
> Ciao,
> Dscho
> 
> 
> 
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Infinite precision begets infinite perfection.