Andy Isaacson wrote:
>
> On Tue, Feb 19, 2002 at 09:07:03AM -0800, Jonathan Marks wrote:
> > On Sun, 2002-02-17 at 15:53, Mark Vojkovich wrote:
> > > On 17 Feb 2002, Jonathan Marks wrote:
> > > > I have an app that displays images and videos in fullscreen. Often when
> > > > killing the one program and starting the next there is a flicker and a
> > > > glimpse of the desktop before the next image/video starts.
> > > >
> > > > I wonder if there is a way to blank the screen, for the period that I
> > > > kill the one program and start the other, and then unblank the screen.
> > >
> > > See the man page on XSetScreenSaver and friends. One of those might
> > > do what you want.
> >
> > Thanks for the prompt response. This application is a bunch of shell
> > and perl scripts. I was wondering if there is a way to do this without
> > resorting to writing C code. Is there a way to blank and unblank the
> > whole screen in X from the command line?
>
> Is it really going to be better for you for the screen to go black
> between images than for it to flash to the desktop?
>
> If this is really what you want, you can do an "xset s activate" before
> killing off the first image-viewer, then "xset s reset" to turn the
> screen back on.
>
> Assuming this is a slideshow of some kind, you might want to do
> "xset s off; xset -dpms" beforehand, to prevent the screen going black
> on you.
>
> -andy
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I think what you need is not to black the screen, but to have a black
backdrop, that is always there to catch moments of no image. That way,
you minimize the amount of blank time. For example, this will work:
display -title backdrop -geometry 1024x768+0+0\! XC:black
If you set the window manager not to decorate the window,
by matching the title.
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