/usr/share/texmf/tex/latex/beamer/base/beamerbasetwoscreens.sty is in latex-beamer 3.24-1.
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 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | % Copyright 2003--2007 by Till Tantau
% Copyright 2010 by Vedran Mileti\'c
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file doc/licenses/LICENSE for more details.
%
% version 1.71 bugfix for \pgfpagescurrentpagewillbelogicalpage (hv)
%
%
\ProvidesPackageRCS $Header: /Users/joseph/Documents/LaTeX/beamer/base/beamerbasetwoscreens.sty,v efa082c6111d 2010/05/01 11:27:03 rivanvx $
\mode
<presentation>
\newif\ifbeamer@twoscreenstext
\newif\ifbeamer@dosecondmode
\defbeameroption{previous slide on second screen}[right]%
{
\pgfpagesuselayout{two screens with lagging second}[second #1]
\beamer@twoscreenstexttrue
\nofiles
}
\defbeameroption{second mode text on second screen}[right]%
{
\pgfpagesuselayout{two screens with optional second}[second #1]
\beamer@twoscreenstexttrue
}
\defbeameroption{always typeset second mode}[true]%
{
\def\beamer@defaultdosecondmode{#1}
}
\def\beamer@defaultdosecondmode{false}
\long\def\beamer@dosecondscreennow#1{% called from \beamer@doseveralframes
\ifbeamer@dosecondmode%
{%
\clearpage%
\def\beamer@currentmode{second}
\def\beamer@doifnotinframe{}%
\def\beamer@doifinframe{\begin{beamer@frameslide}%
#1%
\end{beamer@frameslide}%
\pgfpagescurrentpagewillbelogicalpage{2}%
\clearpage%
}%
{\beamer@masterdecode{\beamer@whichframes}}%
\beamer@donow%
}%
\fi%
}
\mode
<all>
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