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2002-07-06
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ViNCe
=====
This is a reasonably straightforward port of the VNC client.
It supports all the usual encodings plus 'tight'. At the moment,
it only works with 8 and 16 bits pixeldepth on the server side and
the client side is always 16bpp.
License
-------
This program is released under the GPL version 2.
Starting the program
--------------------
Use either
*vnc [switches] ipaddress
or
*vnc -config <configuration file>
Use of the commandline switches is not recommended - use a
configuration file instead!!
switches:
-display <N> set the VNC display no. (usually N=1)
-config <filename> set name of configuration file
-password <password> set the password to use
-8bpp use 8bpp RGB332 on the server
-dither8 request that the server sends
raw data as 8bpp dither (only
useful if you're not using '-8bpp')
-tight request that the server uses
tight encoding (if supported)
-save when quitting, save the screen as
a sprite in <ViNCe$Dir>.screendump
-checkclientbitmap (see below)
-cursor request that the server doesn't
display a cursor, but just sends
movement info
-debug write debug info to stderr
-full <colour> enter in fullscreen mode, using the
specified colour for border colour
-guess attempt to guess the display number
-bottom open the window at the bottom
-top open the window on top
-noborder no borders/scrollbars on the window
(good idea with -full)
-ontop keep the window on top of the
windowstack (good idea with -full)
-anti antitwitter the screen (when using
NCs on a TV)
-scale <scaling> scale the bitmap, 25 <= scaling <= 200
-closewindow <action> what to do when the window is being
closed (0->quit, 1->iconbar)
-fastcopy use Wimp_BlockCopy for some updates
(active only if scale=100 and the
window is fully visible and toggled
to full size) - highly recommended
for users of the Viewfinder card
Refer to the sample configuration file for information about the
format of this.
Tech stuff
----------
The client supports two experimental encodings:
'CheckClientBitmap' which is supposed to tell the server
to maintain a copy of the clientside
bitmap/screen and compare with that
before sending any rectangles; this is
actually a patch against a bug in
Mozilla or Gecko, but it is also very
useful when running any other browser
over VNC as it often reduces the no. of
pixels sent by animated GIFs.
'HextileDither8' is a special version of the hextile
encoding; if hextile fails to compress
a rectangle, the rectangle is normally
sent as raw, using whatever number of
bits per pixels used by the client;
however, this encoding is meant to
dither the rectangle to 8bpp (RGB332)
before sending the raw rectangle, thus
reducing the size of the raw rectangle.
this means that the display is
almost-16bpp quality, but at a bandwidth
closer to 8bpp.
The program can operate in a fullscreen mode. This is for use on
NCs etc.
hextile8.c contains a description of an alternative hextile-like
encoding which will reduce the size of hextile coded data with
typically 20% (depending on the type of data), by not storing
the subrectangle sizes for 1x1, 1x2 and 2x1 subrectangles. Once
X-Windows starts using anti-aliasing for text, this is likely to
be even more efficient.
Requirements
------------
RISC OS 3.5+
If you want to be able to send Ctrl-^ characters, you need Cerilica's
DeepKeys module. Otherwise, Ctrl-^ will be seen as the Home key. This
module is now distributed with ViNCe, but you first need to install it
by copying !ViNCe.DeepKeys.!!DeepKeys to <Boot$ToBeLoaded>.!!DeepKeys
and reboot if it has not already been installed. You can double-click
on the Obey file !ViNCe.DeepKeys.InstDeepK to copy the module.
Credits
-------
2M Electronics (www.2m.dk) sponsored the port.
Thanks to Gil Wozniak for the sprite.
DeepKeys © Cerilica Ltd 2000 Contact: <simon@cerilica.com>
The port was written by
Henrik Bjerregaard Pedersen <henrik@login.dknet.dk>
It is now maintained under the name !ViNCe by
Vincent Lefèvre <vincent@vinc17.org>
You can get the latest version on
http://www.vinc17.org/acorn/riscpc_eng.html