added titleimage and made it and the subtitle optional

Template_Presentation.tex

@@ -5,6 +5,7 @@
 
 \def \TITLE{Example Title}
 \def \SUBTITLE{Example Subtitle}
+\def \TITLEIMAGE{\includesvg[width = 30 mm]{./images/clocktower.svg}}
 \def \AUTHOR{Example Author\\123456\\example@invalid.com}
 \def \COMPACTAUTHOR{Example Author}
 \def \DATE{Example Date}

beamerinnerthemeutokyo.sty

@@ -16,8 +16,13 @@
             \node[below right] at (current bounding box.north west) {
                 \footnotesize
                 \hspace{.05\paperwidth} 
-                {\tiny\inserttitle \space | \insertshortauthor \space | \insertdate}
-                };
+                {
+                    \ifx\SUBTITLE\@empty
+                        \footnotesize\inserttitle~| \insertshortauthor~| \insertdate
+                    \else
+                        \footnotesize\inserttitle~ -- \insertsubtitle~| \insertshortauthor~| \insertdate
+                    \fi
+                }};
             \node[above left] at (current bounding box.south east) {
                     {\huge\insertframenumber}
                 };
@@ -41,16 +46,19 @@
 \defbeamertemplate*{title page}{utokyo}[1][]
 { 
     \begin{center}
-        \vspace{-.2\paperheight}
-        \huge
+        \Huge
         \textbf{\inserttitle}\\
-        \vspace{.05\paperheight}
+        \ifx\SUBTITLE\@empty
+            \else
+                \huge
+                \insertsubtitle\\
+            \fi
+        \ifx\TITLEIMAGE\@empty
+            \else
+                \TITLEIMAGE\\
+            \fi
         \Large
-        \insertsubtitle\\
-        \vspace{.08\paperheight}
-        \normalsize
         \insertauthor\\
-        \vspace{.03\paperheight}
         \insertdate
     \end{center}
 }