/usr/share/psychtoolbox-3/PsychDemos/AlphaImageDemo/WindowCenter.m is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | function [x,y] = WindowCenter(window)
% USAGE: [x,y] = WindowCenter(window)
% Returns a window's center point.
% History
% 26/03/2001 fwc made based on rectcenter
% 05-02-04 fwc OS X PTB compatible
if nargin~=1
error('Usage: [x,y] = WindowCenter(window)');
end
rect=Screen('Rect',window);
[x,y] = RectCenter(rect);
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