Claes Andersson wrote:
>
> To subscribers of the xforms list from Claes Andersson <claesand@fy.chalmers.se> :
>
> Hi,
>
> In a program that I'm writing, I need to show an animation with 600X600 pixmaps.
> The problem is that this is terribly slow and I suspect that it has to do with
> the picture being sent back and forth between the server and the client. I don't
> know what it would be that takes about two seconds in the process else... I'm
> using Xlib calls to display it since the XPM format is tremendously cumbersome
> if you want to display some, you don't know which from time to time, in 24 bits.
>
> Is it possible to do anything to speed this up?
Yes: used shared memory between the client and the X server.
This works if you use Xlib directly (I am not sure that
this can be done through Xforms).
Look at:
XShmQueryExtension()
XShmGetEventBase()
XShmCreateImage()
shmget()
XShmAttach()
XShmPutImage()
XShmDetach()
shmctl()
shmdt()
There are some example of code using those routines
in mpeg_play
(ftp://mm-ftp.cs.berkeley.edu/pub/multimedia/mpeg/play/mpeg_play-2.3-patched-src.tar.gz)
--
Regards, -- Tristan Savatier (mailto:tristan@mpegtv.com)
MpegTV website: /cgi-bin/exit-to?http://www.mpegtv.com
MPEG.ORG website: http://www.mpeg.org
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