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3 total messages Started by David Honig Fri, 18 Dec 1992 02:49
How to make *shared-memory* Pixmaps on Sun 4?
#535
Author: David Honig
Date: Fri, 18 Dec 1992 02:49
20 lines
1213 bytes 
I'm trying to speed up a graphics application.  I'd like one
process to handle file i/o, another to handle animation.

The animation process blasts X pixmaps to a window.  The pixmaps
are made from XImages.  XImages are made from a RAM buffer loaded
from disk.  Standard X stuff.

I can use the BSD shmop() or SysV mmap() calls to get shared memory
for the disk --> RAM transfer and subsequent use of the RAM buffer by
multiple processes.  But how can I have one process convert XImages
into (server-side) Pixmaps and then share those pixmaps with other
processes?  That's the tricky part.

I have a suspicion that I can't do this, since the pixmaps are on the
server, and the processes are on the client side.

Gee, maybe Sun's old pixrects aren't so bad...

DH
Re: How to make *shared-memory* Pixmaps on Sun 4?
#543
Author: Michael Gold
Date: Fri, 18 Dec 1992 22:45
24 lines
1679 bytes 
In <9212171848.aa16515@Paris.ics.uci.edu> honig@ruffles.ICS.UCI.EDU (David Honig) writes:


>I'm trying to speed up a graphics application.  I'd like one
>process to handle file i/o, another to handle animation.

>The animation process blasts X pixmaps to a window.  The pixmaps
>are made from XImages.  XImages are made from a RAM buffer loaded
>from disk.  Standard X stuff.

>I can use the BSD shmop() or SysV mmap() calls to get shared memory
>for the disk --> RAM transfer and subsequent use of the RAM buffer by
>multiple processes.  But how can I have one process convert XImages
>into (server-side) Pixmaps and then share those pixmaps with other
>processes?  That's the tricky part.

>I have a suspicion that I can't do this, since the pixmaps are on the
>server, and the processes are on the client side.

This is exactly what the MIT-SHM extension gives you.  I have no idea
whether or not Sun supports this extension, nor if it can be built for
the MIT server for Sun (though I suspect it should).  (It is available
on all SGI machines running IRIX 4.0 or later, though that probably
doesn't help you.)
Re: How to make *shared-memory* Pixmaps on Sun 4?
#544
Author: Rich Berlin
Date: Fri, 18 Dec 1992 22:51
28 lines
1604 bytes 
> This is exactly what the MIT-SHM extension gives you.  I have no idea
> whether or not Sun supports this extension

Seems to.  xdpyinfo on my machine (running OpenWindows V3) says

number of extensions:    7
    SUN_DGA
    SunWindowGrabber
    XInputDeviceEvents
    Multi-Buffering
    SHAPE
    SUN_ALLPLANES
    MIT-SHM

-- Rich

--
===============================================================================
Richard.Berlin@Eng.Sun.COM 	    SunPics engineering		 (415) 336-5126

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	difficult to stand still and to listen to another woman's voice
	delineate an agony I do not share, or even one in which I myself
	may have participated.  -- Audre Lorde
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