Subject:
Re: Multiple famebuffer
From:
Marc Nijdam ####@####.####
Date:
17 Nov 2000 10:10:42 -0000
Message-Id: <3A1504E2.FA0EE6E5@hp.com>
The way Kim (co-worker of mine) is set up now we're looking at having
multiple framebuffers fb0 and fb1, and would like to get microwindows
use those for double buffering. Is this harder? I guess not, since you
just wouldn't use GrPixmap() but the other fb device to build a
GR_WINDOW_ID instead?
Cheers,
Marc Nijdam
Jordan Crouse wrote:
>
> Ok, now I understand whats going on. You want to double buffer your
> screen, not display to multiple framebuffers.
>
> Thats easy. Just use GrNewPixmap() to create a offscreen "window" that
> you can draw into, just like a real window. Then, when you're ready,
> use GrCopyArea to blit the pixmap area to the screen. For example, here
> I draw a rectangle in the pixmap and then put it on screen:
>
> GR_WINDOW_ID foo = GrNewPixmap(15, 15, NULL);
> GrSetGCForeground(gc, BLUE);
> GrFillRect(foo, gc, 5,5, 5, 5);
>
> GrCopyArea(GR_ROOT_WINDOW_ID, gc, 5, 5, 5, 5, foo, 0, 0, MW_SRCCOPY);
> GrDestroyWindow(foo);
>
> Hope that helps.
> Jordan
>
> "KIM,KYOUNG-IL (HP-Cupertino,ex1)" wrote:
> >
> > Thank you for advice.
> > My question is if Microwindows can use double(triple) framebuffers
> > and compare difference between buffers and update only difference
> > into dispay buffer. I know there was discussions and I don't know
> > how it gose now.
> >
> > Thank you,
> > Kyoung Kim
> >
> > -----Original Message-----
> > From: Alex Holden
> > To: KIM,KYOUNG-IL (HP-Cupertino,ex1)
> > Cc: ####@####.####
> > Sent: 11/16/00 1:30 AM
> > Subject: Re: Multiple famebuffer
> >
> > On Wed, 15 Nov 2000, KIM,KYOUNG-IL (HP-Cupertino,ex1) wrote:
> > > Can Microwindows(Win32 or Nono-X) handle multiple frame buffers ?
> >
> > Not currently. There was some talk recently of adding support for
> > multiple
> > displays; try searching the mailing list archive if you're interested
> > <http://www.linuxhacker.org/lists.phtml>
> >
> > --
> > ------- Alex Holden -------
> > http://www.linuxhacker.org/
> > http://www.robogeeks.org/
> >
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