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% Copyright 2007 by Till Tantau
% Copyright 2015 by Vedran Mileti\'c, 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.

\newif\ifbeamer@sb@subsection

\DeclareOptionBeamer{subsection}[true]{\csname beamer@sb@subsection#1\endcsname}
\ExecuteOptionsBeamer{subsection=true}
\ProcessOptionsBeamer



\mode<presentation>

\setbeamercolor{frametitle}{parent=palette primary}
\setbeamercolor{subsection in head/foot}{parent=palette secondary}
\setbeamercolor{section in head/foot}{parent=palette quaternary}


\beamer@compresstrue

\AtBeginDocument{
  {
    \usebeamerfont*{headline}
    \colorlet{global.bg}{bg}
    \usebeamercolor{subsection in head/foot}
    \usebeamercolor{section in head/foot}
    \usebeamercolor{frametitle}

    \ifbeamer@sb@subsection
      \pgfdeclareverticalshading{beamer@barshade}{\the\paperwidth}{%
         color(0ex)=(subsection in head/foot.bg);%
         color(2.25ex)=(subsection in head/foot.bg);%
         color(3.25ex)=(section in head/foot.bg);%
         color(8.75ex)=(section in head/foot.bg)%
       }
       \pgfdeclareverticalshading{beamer@aboveframetitle}{\the\paperwidth}{%
         color(0ex)=(frametitle.bg);%
         color(1ex)=(subsection in head/foot.bg)
       }
    \else
      \pgfdeclareverticalshading{beamer@barshade}{\the\paperwidth}{%
         color(0ex)=(section in head/foot.bg);%
         color(6ex)=(section in head/foot.bg)%
       }
     \pgfdeclareverticalshading{beamer@aboveframetitle}{\the\paperwidth}{%
         color(0ex)=(frametitle.bg);%
         color(1ex)=(frametitle.bg);%
         color(2ex)=(section in head/foot.bg)
       }
    \fi  
    
    \begingroup
      \selectcolormodel{gray}
      \pgfdeclareverticalshading{beamer@belowframetitle}{\the\paperwidth}{%
        color(0ex)=(pgftransparent!100);%
        color(1ex)=(pgftransparent!0)
      }
      \pgfdeclarefading{beamer@belowframetitlemask}{\pgfuseshading{beamer@belowframetitle}}
    \endgroup
  }
}

                                % Head
\defbeamertemplate*{headline}{smoothbars theme}
{%
  \pgfuseshading{beamer@barshade}%
  \vskip-0.05ex%
  \begin{beamercolorbox}[wd=\paperwidth,ht=1ex,dp=0ex]{empty}
  \begin{pgfpicture}
    \begin{pgfscope}%
      \ifbeamer@sb@subsection%
        \pgfsetfillcolor{subsection in head/foot.bg}%
      \else%
        \pgfsetfillcolor{section in head/foot.bg}%
      \fi%
      \pgfpathrectangle{\pgfpoint{-.5\paperwidth}{-0.5ex}}{\pgfpoint{\paperwidth}{1ex}}%
      \pgfsetfading{beamer@belowframetitlemask}{}%
      \pgfusepath{fill}%
    \end{pgfscope}%
  \end{pgfpicture}%
  \end{beamercolorbox}%
  \ifbeamer@sb@subsection%
    \vskip-9.75ex%
  \else%
    \vskip-6.85ex%
  \fi%
  \begin{beamercolorbox}[ignorebg,ht=2.25ex,dp=3.75ex]{section in head/foot}
    \insertnavigation{\paperwidth}
  \end{beamercolorbox}%
  \ifbeamer@sb@subsection%
    \begin{beamercolorbox}[ignorebg,ht=2.125ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{subsection in head/foot}
      \usebeamerfont{subsection in head/foot}\insertsubsectionhead
    \end{beamercolorbox}%
  \fi%
}%


\defbeamertemplate*{frametitle}{smoothbars theme}
{%
  \nointerlineskip%
  \vskip-0.19ex%
  \usebeamerfont{headline}%
  \begin{beamercolorbox}[wd=\paperwidth,ht=1ex,dp=1ex,vmode]{empty}
    \pgfuseshading{beamer@aboveframetitle}%
  \end{beamercolorbox}%
  \vskip-1ex%
  \nointerlineskip%
  \begin{beamercolorbox}[wd=\paperwidth,leftskip=.3cm,rightskip=.3cm plus1fil,vmode]{frametitle}
    \vskip0.5ex%
    \usebeamerfont*{frametitle}\strut\insertframetitle%
      \ifx\insertframesubtitle\@empty%
        \strut\par%
      \else
        \par{\usebeamerfont*{framesubtitle}{\usebeamercolor[fg]{framesubtitle}\strut\insertframesubtitle}\strut\par}%
      \fi%%
    \usebeamerfont{headline}%
    \vskip0.05ex%
  \end{beamercolorbox}%
  \nointerlineskip%
  \vskip-0.05ex%
  \begin{beamercolorbox}[wd=\paperwidth,ht=1ex,dp=0ex]{empty}
  \begin{pgfpicture}
    \begin{pgfscope}%
      \pgfsetfillcolor{frametitle.bg}%
      \pgfpathrectangle{\pgfpoint{-.5\paperwidth}{-.5ex}}{\pgfpoint{\paperwidth}{1ex}}%
      \pgfsetfading{beamer@belowframetitlemask}{}%
      \pgfusepath{fill}%
    \end{pgfscope}%
  \end{pgfpicture}%
  \end{beamercolorbox}%
}
  
  
\mode
<all>