[sane-devel] Preview in xscanimage only possible as root

[Oliver Schwartz]

> I hope that you can read more out of it than I do.

I don't know if it fixes the original problem, but I found a potential 
problem in the snapscan backend. In sane_control_option, it didn't guard 
against TL_X < BR_X and TL_Y < BR_Y, in particular, when TL_Y = BR_Y the 
number of scanlines is zero and bad things may happen (particularly if trying 
to divide by the scanlines). 

A quick survey showed that other backends (mustek, epson) may show the same 
problem. You have to use the sliders for TL_X etc. to reproduce the error.

The fix for the snapscan backend is in CVS on SourceForge 
(http://sourceforge.net/cvs/?group_id=12742).

But then, I've no idea why this problem should only show up if you run 
xscanimage as user, neither why only preview should be affected. So maybe 
there's still another problem.

Regards,

Oliver

> > Hi,
> >
> > > since I have installed sane 1.06 recently, invoking  the 'preview
> > > window' crashes xscanimage ('floating point exception (core dumped)')
> > > when logged in as mere user.
> > > But xscanimage WORKS when not using a preview.
> > > This doesn't occur when logged in as root, and it didn't at all with
> > > version 1.05.
> > > There is no such problem with xsane (0.81).
> > >
> > > Some more details about my system:
> > > - Pentium 3
> > > - Redhat 7.1 with kernel 2.4.9-12
> > > - AGFA SNAPSCAN 1212U_2 with firmware loaded by
> > >    /usr/local/etc/sane.d/snapscan.conf