From 9adb594f2de675771ed643e6a9049ef1f681d9f0 Mon Sep 17 00:00:00 2001
From: Benjamin Weiss <benjamin.weiss@tu-ilmenau.de>
Date: Thu, 11 Jun 2015 10:53:20 +0200
Subject: [PATCH] added invertcolors option

---
 beamercolorthememetropolis.sty | 27 +++++++++++++++++++++++----
 beamerthemem.sty               |  7 +++++++
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/beamercolorthememetropolis.sty b/beamercolorthememetropolis.sty
index 31d3df8..54e44c0 100644
--- a/beamercolorthememetropolis.sty
+++ b/beamercolorthememetropolis.sty
@@ -19,6 +19,18 @@
     \@beamer@metropolis@blockbgtrue
 }
 
+% Options
+% =======
+
+% Option: invertcolors
+%         makes the background dark and the foreground light
+
+\newif\if@beamer@metropolis@invertcolors
+\@beamer@metropolis@invertcolorsfalse
+\DeclareOptionBeamer{invertcolors}{
+    \@beamer@metropolis@invertcolorstrue
+}
+
 % Option: ...
 
 \DeclareOptionBeamer*{%
@@ -57,10 +69,17 @@
 % in your preamble.
 %
 
-\setbeamercolor{normal text}{%
-  fg=mDarkTeal,
-  bg=black!2
-}
+\if@beamer@metropolis@invertcolors
+  \setbeamercolor{normal text}{%
+    fg=black!2,
+    bg=mDarkTeal
+  }
+\else
+  \setbeamercolor{normal text}{%
+    fg=mDarkTeal,
+    bg=black!2
+  }
+\fi
 
 \setbeamercolor{alerted text}{%
   fg=mLightBrown
diff --git a/beamerthemem.sty b/beamerthemem.sty
index 65cde91..c8e1341 100644
--- a/beamerthemem.sty
+++ b/beamerthemem.sty
@@ -81,6 +81,13 @@
   \PassOptionsToPackage{blockbg}{beamercolorthememetropolis}%
 }
 
+% Option: invertcolors
+%         makes the background dark and the foreground light
+
+\DeclareOptionBeamer{invertcolors}{
+  \PassOptionsToPackage{invertcolors}{beamercolorthememetropolis}%
+}
+
 % Option: ...
 
 \DeclareOptionBeamer*{