/usr/share/psychtoolbox-3/PsychOneliners/BlackIndex.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | function black=BlackIndex(windowPtrOrScreenNumber)
% color=BlackIndex(windowPtrOrScreenNumber)
% Returns the CLUT index to produce black at the current screen depth,
% assuming a standard color lookup table for that depth. E.g.
% black=BlackIndex(w);
% Screen(w,'FillRect',black);
%
% See WhiteIndex.
%
% When the screen is 1 to 8 bit mode, the Macintosh OS always makes the
% first clut element white and the last black. In 16 or 32 bit mode the
% clut goes from black to white. These CLUT conventions can be overridden
% by Screen 'SetClut', which makes a direct call to the video driver,
% bypassing the Mac OS, allowing you to impose any CLUT whatsoever.
% 3/10/98 dgp Wrote it.
% 3/30/98 dgp Consider only one channel, even for 16 and 32 bit modes.
% 3/8/2000 emw Added platform conditional
% 3/8/2000 dgp Fixed platform conditional
% 3/30/2004 awi Added OS X case. For now OS X only supports true-color mode, so
% BlackIndex behavior on OS X will have to change when we add
% more depth modes.
% 1/29/05 dgp Cosmetic.
% 3/01/08 mk Changed to a simple return value of zero - anything else
% doesnt' make sense with PTB-3.
if nargin~=1
error('Usage: color=BlackIndex(windowPtrOrScreenNumber)');
end
black=0;
return;
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