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The API is basically to grab the window ID from $XSCREENSAVER_WINDOW (could be
hex or decimal) and draw to that. There are also the following command line
options:
-root find the "root" window for this screen and draw in it
-window create an X window and draw in it
-window-id <arg> draw in the given window
-pair
Also unclear how OpenGL-based hacks differ from Xlib-based hacks (in terms of
window selection).
The code in glutin (rust) that creates a Window object is:
https://github.com/tomaka/glutin/blob/master/src/api/x11/window.rs
glutin/src/api/x11/window.rs:421
// getting the root window
let root = unsafe { (display.xlib.XDefaultRootWindow)(display.display) };
display.check_errors().expect("Failed to get root window");
The code in XScreensaver "hacks" that seems to latch on to an existing window is:
https://github.com/Zygo/xscreensaver/blob/master2/hacks/screenhack.c#L872
(possible section of xscreensaver hack code dealing with window stuff?)
After figuring all this out, I found a perl equivalent:
http://search.cpan.org/dist/OpenGL-XScreenSaver/lib/OpenGL/XScreenSaver.pm
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