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-------Original Message-------
Date: June 02, 2002
07:05:17 PM
Subject: Re:
[Xpert]modelines for hdtv?
On Fri, 31 May 2002, Doug McClendon wrote:
>
Regarding 1080p for dvd, I think you are mistaken. My (only
moderately
> educated) understanding was that the 'good' dvd players
put out 480p
> instead of 480i(ntsc). I also don't think that there
is any tv out
> there that does 1080p. The two hdtv standards are
1080i and 720p to my
> knowlege. The TV I'm interested in does
1080i, which I assume means
> that it can also do 540p. Ideally I'm
looking for a good 640x480@60
> modeline, and a 1920x540@60
modeline. 1920x1080i would be interesting
> to try, but since this
is about using the tv as a big monitor, I'm
> really not interested
in interlacing.
>
> Out of curiosity- Does anybody have any
advice regarding fonts or any
> other tricks when you have severely
non square pixels (1920x540)? It
> seems like it would be a nice
feature of the X server to handle such
> issues transparently.
I'd say you do want interlacing.
Use 1920x1080i at 120
fields/sec = 60 frames/sec.
At 120 fields/sec, flicker wont be a
problem, the pixels will be squarish,
and the interlacing will give you
analog hardware anti-aliasing
(in the monitor, not the
card!).
Sorry, I don't have a suitable modeline to suggest - my
modeline tools
are for VESA GTF, which may not apply to HDTV, and none
of them give a
correct XFree86 interlaced modeline (X seems to want
the vertical
timings doubled, but I haven't worked out exactly what it
wants).
You can use the DisplaySize option to tell the X server
what size the
screen is. It will then tell any app that asks the
horizontal and
vertical pixel pitches (dpi), but this confuses
sufficiently many apps
that by default we don't set this from the DDC
info.
The RENDER font system could probably cope, but most apps don't
get
anything sensible out of the old font renderer.
> I
doubt there is anything now, but how far are we
> from an X server
based on 3D hardware, i.e. a nice 5Kx5K non visible
> desktop that
gets rendered with a bilinear filter to whatever resolution
> the
desktop actually is? That would
> take care of generic anti-aliasing
(fonts and more) quite nicely no?
> Zoomable
windows...
OpenGL based 3D window / desktop managers have been
around for
several years. I don't have any names, but they do what you
want,
plus allow windows to exist at an angle to the screen
(tilt it
away, so that you can still get an overview of what is going
on, but
take up very little width or height...).
5Kx5K ? I believe that
they allow the windows to exist in a 3D volume
with floating point
coordinates (might even get around the limit (16bits?
on coordinates on
an X screen).
--
Dr. Andrew C. Aitchison Computer Officer,
DPMMS, Cambridge
[EMAIL PROTECTED] http://www.dpmms.cam.ac.uk/~werdna
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