Re: MIT-SHM example

["Rose Cumming" <rose_alice_cumming hotmail com>]

To add further, I posted my inquery to this email list because the buttons 
of my application are set up on a Gtk::Window.

I want to use low level Xlib drawing API with a Gtk::DrawingArea.
My application is targeted on a single host machine. So I want to use the 
fastest way to draw images possible.

Anyone has an example using Xlib with a Gtkmm application?

Rose

> From: "Rose Cumming" <rose_alice_cumming hotmail com>
> To: paul linuxaudiosystems com
> CC: gtkmm-list gnome org
> Subject: Re: MIT-SHM example
> Date: Mon, 19 Sep 2005 16:44:09 +0000
>
> I'm not confused.
> My application (client) and the X server are running on the same machine.
>
> I want to have very high frame rates to playback my raw data images.
> I have tried drawing primitives like draw_rgb_image and draw_gray_image.
>
> What you said was consistent with previous email archieves I read. Using 
> MIT-SHM will avoid network flow because the image (Xmage) use shared memory 
> when the client and server are on the same machine.
> I have this link
> http://ftp.xfree86.org/pub/XFree86/4.5.0/doc/mit-shm.txt
> that talks about shared memory XImage.
>
> but if anyone has working example of how to set up a simple application, it 
> would be greatly appreciated.
>
> > From: Paul Davis <paul linuxaudiosystems com>
> > Reply-To: paul linuxaudiosystems com
> > To: Rose Cumming <rose_alice_cumming hotmail com>
> > CC: gtkmm-list gnome org
> > Subject: Re: MIT-SHM example
> > Date: Mon, 19 Sep 2005 09:42:19 -0400
> >
> > On Fri, 2005-09-16 at 17:03 +0000, Rose Cumming wrote:
> > > Hello all,
> > >
> > > Does anyone have a reference to an example of how to use MIT shared 
> > memory
> > > extension?
> > > I use gtkmm 2.2 and try to render an image using MIT-SHM on a gtkmm 
> > window.
> > >
> > > A simple client example of setting up the window, and modify raw pixel 
> > will
> > > help.
> > > Perhaps a reference to the MIT-SHM API will help. I can't find any 
> > clues.
> >
> > you're a little confused, i believe.
> >
> > client-side software doesn't use the MIT-SHM unless its part of the Xlib
> > implementation that talks to the X server. its just way to (drastically)
> > reduce the amount of data passed over the serialized communication link
> > with the server. but its very very low level; even GDK (the drawing kit)
> > doesn't really mess with things at that level.
> >
> > if you are writing stuff that renders images, you have no reason to
> > think about whether MIT-SHM exists or not - Xlib will take care of that
> > for you.
> >
> > --p
>
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