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From: janssen@parc.xerox.com (Bill Janssen)
Newsgroups: comp.windows.x
Subject: Re: Animated images under X11
Keywords: screenload, shared pixmaps, images, bitmaps
Message-ID: <227@roo.UUCP>
Date: 28 Feb 90 02:14:54 GMT
References: <2169@syma.sussex.ac.uk> <132261@sun.Eng.Sun.COM>
Sender: news@parc.xerox.com
Reply-To: janssen@parc.xerox.com (Bill Janssen)
Organization: Xerox Palo Alto Research Center
Lines: 22
In-reply-to: hvr@kimba.Sun.COM (Heather Rose)

In article <132261@sun.Eng.Sun.COM>, hvr@kimba (Heather Rose) writes:
>In article <2169@syma.sussex.ac.uk> jonm@syma.sussex.ac.uk (Jonathan Meyer) writes:
>>For a real-time operation such as this, we need to be able to tell the X
>>server to load an image directly from the local disc to the screen, in the
>>same way that fonts are loaded into the server.
>
>I believe there is an extension in the works called shared X.  What

Shared-X is popularly reserved for the systems that allow a single
X client to be displayed on multiple X servers simultaneously.

The MIT X11R4 server already has a `shared memory' extension that
allows a program to create pixmaps that are shared between the client
and the application.  The application can write into the pixmap array
directly, then tell the server to do a CopyArea from it, resulting in
a very fast operation.  We've used it to good effect here already.

Bill
--
 Bill Janssen        janssen.pa@xerox.com      (415) 494-4763
 Xerox Palo Alto Research Center
 3333 Coyote Hill Road, Palo Alto, California   94304