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Re: [ferret_users] wHDF not supported on this platform



Hi Ryo,


Ryo Furue wrote:
Hi Martin,

| you could use animation on the fly:
| | use coads_climatology
| repeat/l=1:12/anim/loop=10 shade sst
| | However, this requires that your X-server supports a virtual fram
| buffer, i.e. "backing store" must be enabled.

Thanks for the suggestion.  It sounds really promising and must be
the way to go.  But, it doesn't work for unknown reasons, even though
Backing Store is enabled.  The first frame is briefly displayed and
is followed by white (empty) frames.  I tested Ferret 6.30 and 6.61 .
I use the "testing" distribution of Debian.
This is what we see with Suse linux, when backing store is not enabled. For Suse 9 and 10 it works fine, if
backing store is switched on. The kde version is kde 3
The process looks like

/usr/X11R6/bin/X -br +bs vt7 -auth /var ......

+bs is the key! I suggest to check your X server. Use "ps -ef | grep X"

For Suse 11 the screen freezes, as far as I remember, not with ferret but from kde4 that is mandatory here.
| This does not work for example with the latest ferret release for
| AIX, even if -bs is set for the X-server.
| | For linux (suse distribution) this works fine if there is a line | | Option "backingstore" "true" | | in XF86Config. However, in the latest suse release (11) this nice
| feature is broken. The developers of kde
| with the "plasma" features do not care about backing store. If you
| switch on backing store your screen freezes
| soon. Searching the forums and help areas there are answers like
| "Who needs this - switch it off ... :-(

Familiar to me, but I don't know those things well enough to
understand why backing store isn't an important feature any longer
to most applications.
Please note backing store works through the net. I am running ferret from time to time in a remote compute center. There the machine does not run with backing store switched on. The key is my home machine that has this feature enabled. X generates an animation through the web without knowing anything about the remote system, the
graphics adapter ... for me a great tool.

May be kde-programmers think in terms of a PC and do not really care about the original
ideas of X as a tool for unified remote work.
| Virtual machines often do not support backing store too. So it would
| be great, if some other solution could be found.
| | Another way is to use whirlgif and gifview | | rm sst.gif*
| ferret -gif
| yes? use coads_climatology
| yes? repeat/l=1:12 (shade/lev=(-2,32,1) sst;fill/over/lev=(-2,32,1)
| sst;go fland 20;frame/file=sst.gif)
| quit
| | mv sst.gif sst.gif.~12~
| ls sst.gif.* | sort -t~ +1 -n  > gifs.cmd
| whirlgif -o sst.gif -loop -i gifs.cmd | | gifview -a sst.gif
Thanks.  I didn't know gifview; whenever I needed to view a GIF
animation, I used a webbrowser to open it!
In the past browsers were limited and only short animations could be shown. gifview has more options to control the animation and may display long "films". For sure there are other and possibly better tools.
Regards,
Ryo



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