You could put the image where you want on a black/transparent background
the size of your screen.

Tomas

On Sep 19, 2017 8:17 AM, "Michael Robinson" <[email protected]>
wrote:

> I have a simple Xlib program that displays a PNG file without a border
> or title bar on the X display.  I need to display the image dead center
> on the screen and about 50-100 pixels to the right.  How do I display
> the image twice and how do I control the location of the two images?
> This is a Raspbian Stretch default install I'm running, not Lite.
> What window manager am I using?  Is there a way to do a black
> background and no window manager at all?  When the Pi is hooked
> to a projector, the projector should not be displaying a background
> picture or anything else on the standard desktop.  The C program
> should have the mouse and keyboard locked out.  How do I return control
> to X if the program crashes so I don't have to power down the Pi and
> power it back up without a proper reboot?  I need to do a release on
> exit or something similar.  I'm working on a demo program before I
> tackle the larger program which I can't discuss in detail.  Gotta
> learn how to draw in X.
>
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