Frustrated by the lack of PalmVNC-compatible server-side scaling
extensions in Xvnc, I implemented them myself over the last couple of
days.  That is, I patched a copy of vnc-3.3.7-unixsrc to action the
rfbReSizeFrameBuffer and rfbSetScaleFactor extended VNC protocol
commands.

It's usable between my Tungsten-C with PalmVNC 2.0 and RedHat Linux
with Xvnc.  However, there are several known, minor problems:

  o  Some ugly artifacts sometimes appear after a while.  I suspect
     that's because the CopyRect mechanism copies low resolution data
     entirely on the client that is not always perfectly aligned;

  o  Scaling the screen smaller than the Palm display results in a
     tiling effect instead of blanking the unused portion of the Palm
     display;

  o  Scrolling the screen right off the Palm display sometimes
     crashes the Xvnc server.

To apply the patch, build and install Xvnc, start by downloading
vnc-3.3.7-unixsrc.tar.gz into the directory containing
vnc-3.3.7-sss-patch, then:

    gunzip -c vnc-3.3.7-unixsrc.tar.gz | tar xf -
    patch -p0 < vnc-3.3.7-sss-patch
    cd vnc-3.3.7-unixsrc/
    sh ./configure
    make
    cd Xvnc
    make World
    cd ..
    su
    sh ./vncinstall /usr/local/bin
    exit

For details or problems building Xvnc, please see the readme files in
the vnc-3.3.7-unixsrc directory.  Note that I didn't write Xvnc nor
PalmVNC, only the unofficial patch for PalmVNC-compatible server-side
scaling.

References:

   VNC home page: http://www.realvnc.com/

   PalmVNC 2.0:   http://palmvnc2.free.fr/

   PalmVNC 1.4:   http://www.btinternet.com/~harakan/PalmVNC/
--
Peter McGavin.   (p.mcgavin@irl.cri.nz)