% Copyright 2003--2007 by Till Tantau
% Copyright 2010 by Vedran Mileti\'c
% Copyright 2015 by Vedran Mileti\'c, Joseph Wright
% Copyright 2017,2018 by Louis Stuart, Joseph Wright
%
% 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.

\mode
<presentation>

%
% Color theme stuff
%

\define@key{beamerthc}{fg}
  {\expandafter\def\csname beamer@thcfg@\beamer@temp\endcsname{\def\beamer@thc@fg{#1}}}
\define@key{beamerthc}{bg}
  {\expandafter\def\csname beamer@thcbg@\beamer@temp\endcsname{\def\beamer@thc@bg{#1}}}
\define@key{beamerthc}{parent}
  {\expandafter\def\csname beamer@thcinherits@\beamer@temp\endcsname{%
    \@for\@temp:={#1}\do{\expandafter\beamer@thc@docolor\expandafter{\@temp}}}}
\define@key{beamerthc}{use}
  {\expandafter\def\csname beamer@thcuse@\beamer@temp\endcsname{%
    \@for\@temp:={#1}\do{\expandafter\beamer@thc@usecolor\expandafter{\@temp}}}}

\def\beamer@thc@prepcolor{%
  \let\beamer@thc@fg=\@empty%
  \let\beamer@thc@bg=\@empty%
}

\def\beamer@thc@docolor#1{%
  \csname beamer@thcuse@#1\endcsname%
  \csname beamer@thcinherits@#1\endcsname%
  \csname beamer@thcfg@#1\endcsname%
  \csname beamer@thcbg@#1\endcsname%
}

\def\beamer@thc@usecolor#1{%
  \begingroup%
    \beamer@thc@prepcolor%
    \beamer@thc@docolor{#1}%
    \ifx\beamer@thc@fg\@empty\def\beamer@thc@fg{fg}\fi%
    \ifx\beamer@thc@bg\@empty\def\beamer@thc@bg{bg}\fi%
    \global\let\beamer@thc@gfg\beamer@thc@fg%
    \global\let\beamer@thc@gbg\beamer@thc@bg%
    \globalcolorstrue%
    \colorlet{#1.fg}{\beamer@thc@gfg}%
    \colorlet{#1.bg}{\beamer@thc@gbg}%
  \endgroup%
}

\def\setbeamercolor{\@ifstar{\beamer@clearbeamercolor}{\beamer@setbeamercolor}}

\newcommand\beamer@clearbeamercolor[2]{%
  \def\beamer@temp{#1}%
  \expandafter\let\csname beamer@thcfg@#1\endcsname=\relax%
  \expandafter\let\csname beamer@thcbg@#1\endcsname=\relax%
  \setkeys{beamerthc}{use={},parent={}}%
  \setkeys{beamerthc}{#2}%
}
\newcommand\beamer@setbeamercolor[2]{%
  \def\beamer@temp{#1}%
  \setkeys{beamerthc}{#2}%
}

\newcommand\ifbeamercolorempty[2][]{%
  \beamer@thc@prepcolor%
  \beamer@thc@docolor{#2}%
  \expandafter\ifx\csname beamer@thc@#1\endcsname\@empty%
    \expandafter\@firstoftwo%
  \else%
    \expandafter\@secondoftwo%
  \fi%
}


\def\usebeamercolor{\@ifstar{\beamer@usebeamercolor[fg]{normal text}\beamer@usebeamercolor}{\beamer@usebeamercolor}}
\newcommand\beamer@usebeamercolor[2][]{%
  \beamer@thc@prepcolor%
  \beamer@thc@docolor{#2}%
  \ifx\beamer@thc@fg\@empty%
    \@namelet{\string\color@ temp@fg}{\string\color@ fg}%
  \else%
    \colorlet{temp@fg}{\csname beamer@thc@fg\endcsname}%
  \fi%
  \ifx\beamer@thc@bg\@empty%
    \@namelet{\string\color@ temp@bg}{\string\color@ bg}%
  \else%
    \colorlet{temp@bg}{\csname beamer@thc@bg\endcsname}%
  \fi%
  \@namelet{\string\color@ parent.fg}{\string\color@ fg}%
  \@namelet{\string\color@ parent.bg}{\string\color@ bg}%
  \@namelet{\string\color@ fg}{\string\color@ temp@fg}%
  \@namelet{\string\color@ bg}{\string\color@ temp@bg}%
  \begingroup%
    \global\@namelet{\string\color@ #2.fg}{\string\color@ temp@fg}%
    \global\@namelet{\string\color@ #2.bg}{\string\color@ temp@bg}%
  \endgroup%
  \def\beamer@temp{#1}%
  \ifx\beamer@temp\@empty%
  \else%
    \color{#1}%
  \fi%
}

\colorlet{fg}{black}
\colorlet{bg}{white}

\mode
<article>
{
  \newcommand\setbeamercolor{\@ifstar{\@gobbletwo}{\@gobbletwo}}
  \newcommand\usebeamercolor{\@ifstar{\beamer@optgog}{\beamer@optgog}}
  \newcommand\beamer@optgog[2][]{}
}



%
% Colored boxes
%

\define@key{beamercolbox}{wd}{\def\beamer@colbox@wd{#1}}
\define@key{beamercolbox}{ht}{\def\beamer@colbox@ht{#1}}
\define@key{beamercolbox}{dp}{\def\beamer@colbox@dp{#1}}
\define@key{beamercolbox}{leftskip}{\def\beamer@colbox@ls{#1}}
\define@key{beamercolbox}{rightskip}{\def\beamer@colbox@rs{#1}}
\define@key{beamercolbox}{left}[0pt]{\def\beamer@colbox@ls{0pt}\def\beamer@colbox@rs{#1 plus1fill}}
\define@key{beamercolbox}{center}[0pt]{\def\beamer@colbox@ls{#1 plus1fill}\def\beamer@colbox@rs{#1 plus1fill}}
\define@key{beamercolbox}{right}[0pt]{\def\beamer@colbox@ls{#1 plus1fill}\def\beamer@colbox@rs{0pt}}
\define@key{beamercolbox}{sep}{\def\beamer@colbox@sep{#1}}
\define@key{beamercolbox}{colsep}{\def\beamer@colbox@colsep{#1}}
\define@key{beamercolbox}{colsep*}{\def\beamer@colbox@colseps{#1}}
\define@key{beamercolbox}{shadow}[true]{\def\beamer@colbox@shadow{#1}}
\define@key{beamercolbox}{rounded}{\csname beamer@colbox@rounded#1\endcsname}
\define@key{beamercolbox}{ignorebg}[true]{\csname beamer@colbox@ignorebg#1\endcsname}
\define@key{beamercolbox}{vmode}[]{\def\beamer@vmode{}}

\newif\ifbeamer@colbox@rounded
\newif\ifbeamer@colbox@ignorebg

\newenvironment{beamercolorbox}[2][]{%
  \def\beamer@vmode{\leavevmode}%
  \setkeys{beamercolbox}{wd=\textwidth,ht={},dp={},%
    leftskip=0pt,rightskip=0pt plus1fil,%
    sep=0pt,colsep=0pt,colsep*=0pt,%
    shadow=false,rounded=false,ignorebg=false}%
  \setkeys{beamercolbox}{#1}%
  \ifbeamercolorempty[bg]{#2}{\@tempswafalse}{\@tempswatrue}%
  \ifbeamer@colbox@ignorebg\@tempswafalse\fi%
  \def\beamer@colbox@color{#2}%
  \setbox\beamer@tempbox=\hbox\bgroup\color@begingroup
    \ifbeamer@colbox@ignorebg%
      \colorlet{beamer@temp@color}{bg}%
      \usebeamercolor[fg]{#2}%
      \colorlet{bg}{beamer@temp@color}%
    \else%
      \usebeamercolor[fg]{#2}%
    \fi%
    \vbox\bgroup%
    \hsize=\beamer@colbox@wd%
    \@arrayparboxrestore%
    \leftskip=\beamer@colbox@ls%
    \ifdim\beamer@colbox@sep>\z@\advance\leftskip\beamer@colbox@sep\fi%
    \rightskip=\beamer@colbox@rs%
    \ifdim\beamer@colbox@sep>\z@\advance\rightskip\beamer@colbox@sep\fi%
    \if@tempswa\ifdim\beamer@colbox@colsep>\z@%
      \advance\leftskip by\beamer@colbox@colsep%
      \advance\rightskip by\beamer@colbox@colsep%
      \vskip\beamer@colbox@colsep%
    \fi%
      \ifdim\beamer@colbox@colseps>\z@\vskip\beamer@colbox@colseps\fi%
    \fi%
    \ifdim\beamer@colbox@sep>\z@\vskip\beamer@colbox@sep\fi%
    \beamer@vmode\ignorespaces}{%
    \ifdim\beamer@colbox@sep>\z@\vskip\beamer@colbox@sep\fi%
    \if@tempswa
      \ifdim\beamer@colbox@colsep>\z@\vskip\beamer@colbox@colsep\fi%
      \ifdim\beamer@colbox@colseps>\z@\vskip\beamer@colbox@colseps\fi%
    \fi%
  \egroup\color@endgroup\egroup%
  \wd\beamer@tempbox=\beamer@colbox@wd%
  \ifx\beamer@colbox@ht\@empty\else\ht\beamer@tempbox=\beamer@colbox@ht\fi%
  \ifx\beamer@colbox@dp\@empty\else\dp\beamer@tempbox=\beamer@colbox@dp\fi%
  \ifbeamer@colbox@rounded%
    \if@tempswa%
      \begin{beamerboxesrounded}[%
        shadow=\beamer@colbox@shadow,%
        lower=\beamer@colbox@color,%
        upper=normal text,%
        width=\beamer@colbox@wd]{}%
        \box\beamer@tempbox%
      \end{beamerboxesrounded}%
    \else%
      \ifdim\wd\beamer@tempbox>\textwidth%
        \setbox\beamer@tempbox=\hbox to\textwidth{\hss\box\beamer@tempbox\hss}%
      \fi%
      \box\beamer@tempbox%
    \fi%
  \else%
    \if@tempswa\setbox\beamer@tempbox=\hbox{%
      \usebeamercolor{\beamer@colbox@color}%
      \hskip-\beamer@colbox@colseps%
      \fboxsep=\z@\colorbox{bg}{%
        \hskip\beamer@colbox@colseps%
        \box\beamer@tempbox%
        \hskip\beamer@colbox@colseps%
      }%
      \hskip-\beamer@colbox@colseps%
      }\fi%
    \ifdim\wd\beamer@tempbox>\textwidth%
      \setbox\beamer@tempbox=\hbox to\textwidth{\hskip0pt minus\beamer@leftmargin\relax\box\beamer@tempbox\hskip0pt minus\beamer@rightmargin\relax}%
    \fi%
    \box\beamer@tempbox%
  \fi%
}

\mode
<article>
{
  \newenvironment{beamercolorbox}[2][]{}{}
}


%
% Install these colors at the start of the document
%

\AtBeginDocument{
  \usebeamercolor*{alerted text} % Define these colors
  \usebeamercolor*{example text} % Define these colors
  \usebeamercolor*{structure}    % Define these colors
  \usebeamercolor{normal text}
  \color{fg}
  \def\normalcolor{\color{normal text.fg}}
}




%
% Math mode color hackery
%

\newcommand\beamer@setmathcolor{%
  \usebeamercolor{math text inlined}%
  \ifbeamercolorempty[fg]{math text inlined}{}{\color{fg}}}

\newcommand\donotcoloroutermaths{%
  \everymath\expandafter\expandafter\expandafter{%
    \expandafter\donotcoloroutermaths@aux\the\everymath
      \beamer@setmathcolor\beamer@setmathcolor\beamer@stop
    \everymath\expandafter{\the\everymath\beamer@setmathcolor}%
  }%
}
\newcommand\donotcoloroutermaths@aux{}
\long\def\donotcoloroutermaths@aux
  #1\beamer@setmathcolor#2\beamer@setmathcolor#3\beamer@stop{%
    #1#2%
  }

\newcommand\beamer@setdisplaymathcolor{%
  \usebeamercolor{math text displayed}%
  \ifbeamercolorempty[fg]{math text displayed}{}{\color{fg}\aftergroup\ignorespaces}}%

\newcommand\donotcolorouterdisplaymaths{%
  \everydisplay\expandafter\expandafter\expandafter{%
    \expandafter\donotcolorouterdisplaymaths@aux\the\everydisplay
      \beamer@setdisplaymathcolor\beamer@setdisplaymathcolor\beamer@stop
    \everydisplay\expandafter{\the\everydisplay\beamer@setdisplaymathcolor}%
  }%
}
\newcommand\donotcolorouterdisplaymaths@aux{}
\long\def\donotcolorouterdisplaymaths@aux
  #1\beamer@setdisplaymathcolor#2\beamer@setdisplaymathcolor#3\beamer@stop{%
    #1#2%
  }

\AtBeginDocument
{
  \everymath\expandafter{\the\everymath\beamer@setmathcolor}
  \everydisplay\expandafter{\the\everydisplay\beamer@setdisplaymathcolor}
}

\AtBeginDocument{
  % Fix $ usage in tabular:
  \let\beamer@orig@tabular=\@tabular
  \def\@tabular{\donotcoloroutermaths\beamer@orig@tabular}

  % Fix $ usage in underline:
  \let\beamer@orig@underline=\underline
  \def\underline#1{{\donotcoloroutermaths\beamer@orig@underline{#1}}}

  % Fix $ usage in underline:
  \let\beamer@orig@@textsubscript=\@textsubscript
  \def\@textsubscript#1{{\donotcoloroutermaths\beamer@orig@@textsubscript{#1}}}
  \let\beamer@orig@@textsuperscript=\@textsuperscript
  \def\@textsuperscript#1{{\donotcoloroutermaths\beamer@orig@@textsuperscript{#1}}}

  % Fix $ usage in parbox:
  \let\beamer@orig@pboxswture=\@pboxswtrue
  \def\@pboxswtrue{\donotcoloroutermaths\beamer@orig@pboxswture}

  % Fix $$ usage in align:
  \let\beamer@orig@start@align=\start@align
  \def\start@align{\donotcolorouterdisplaymaths\donotcoloroutermaths\beamer@setdisplaymathcolor\beamer@orig@start@align}

  % Fix $$ usage in gather:
  \let\beamer@orig@start@gather=\start@gather
  \def\start@gather{\donotcolorouterdisplaymaths\donotcoloroutermaths\beamer@setdisplaymathcolor\beamer@orig@start@gather}

  % Fix $$ usage in multicolumn:
  \let\beamer@orig@start@multline=\start@multline
  \def\start@multline{\donotcolorouterdisplaymaths\donotcoloroutermaths\beamer@setdisplaymathcolor\beamer@orig@start@multline}

  % Fix $$ usage in eqnarray:
  \let\beamer@orig@eqnarray=\eqnarray
  \def\eqnarray{\donotcolorouterdisplaymaths\donotcoloroutermaths\beamer@setdisplaymathcolor\beamer@orig@eqnarray}

  % Fix \text:
  \let\beamer@orig@text@=\text@
  \def\text@#1{{\ifbeamercolorempty[fg]{normal text in math text}{}{\usebeamercolor[fg]{normal text in math text}}\beamer@orig@text@{#1}}}
}

%
% Allow mixins to survive groups:
%

\let\beamerorig@set@color=\set@color
\let\beamerorig@reset@color=\reset@color

\edef\beamer@zeropt{\the\z@}

\def\beamer@current@colorhook{}

\def\set@color{%
  \edef\beamer@current@colorhook{\beamer@colorhook}%
  \beamerorig@set@color}
\def\reset@color{%
  \beamer@lastskip=\lastskip%
  \edef\beamer@lastskiptexta{\the\lastskip}%
  \ifx\beamer@lastskiptexta\beamer@zeropt\else%
    \ifvmode\unskip\fi%
    \ifhmode\unskip\fi%
  \fi%
  \ifx\beamer@current@colorhook\beamer@colorhook%
    \beamerorig@reset@color%
  \else% mixin changed -> recalculate
    \colorlet{beamer@tempcolor}{.}%
    \applycolormixins{beamer@tempcolor}%
    \@namelet{current@color}{\string\color@beamer@tempcolor}%
    \beamerorig@reset@color%
    \pgfsys@color@unstacked{beamer@tempcolor}%
  \fi%
  \ifx\beamer@lastskiptexta\beamer@zeropt%
  \else%
    \ifvmode\vskip\beamer@lastskip\fi%
    \ifhmode\hskip\beamer@lastskip\fi%
  \fi%
}



% compatibility:

\AtBeginDocument{
  \colorlet{structure}{structure.fg}
  \colorlet{beamerstructure}{structure.fg}
  \colorlet{averagebackgroundcolor}{normal text.bg}
}

\mode
<article>
{
  \def\beamersetaveragebackground#1{}

  \ifbeamer@articlexcolor
    \colorlet{averagebackgroundcolor}{white}
  \fi
}

\colorlet{alert}{red!95!black}
\definecolor{structure}{rgb}{0.2,0.2,0.7} % dummy -- not used

\colorlet{beameralert}{alert}
\colorlet{beamerexample}{green!50!black}
\colorlet{beamerstructure}{structure} % dummy

\mode
<article>
{
  \ifbeamer@articlexcolor
    \definecolor{alert}{rgb}{1,0,0}

    \colorlet{beameralert}{alert}
    \colorlet{beamerexample}{green!50!black}
    \colorlet{beamerstructure}{black}
    \colorlet{structure}{beamerstructure}
  \fi

}


\mode
<all>
