Switching back to Computer Modern within XeLaTeX

Question

Until I select a font using \fontspec{ ... }, XeLaTeX uses the default of Computer Modern. Once I select some font, I have no idea how to re-select Computer Modern. Can anyone help?

Answer 1

XeLaTeX (via fontspec) actually uses the Latin Modern version of Computer Modern. So to change back to it you can do two things:

1. Install the Latin Modern Fonts into your system and load the font using \newfontfamily
2. Use the standard \fontfamily...\selectfont method.

% !TEX TS-program = XeLaTeX

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Linux Libertine O}
%\newfontfamily\lmodern{Latin Modern Roman} % If font exists on your system
% Optical sizes need to be set up manually using the [SizeFeatures] option
% or select the font using the regular font selection methods
\newcommand{\lmr}{\fontfamily{lmr}\selectfont} % Latin Modern Roman
\newcommand{\lmss}{\fontfamily{lmss}\selectfont} % Latin Modern Sans
\newcommand{\lmss}{\fontfamily{lmtt}\selectfont} % Latin Modern Mono
\begin{document}
Some text in Linux Libertine.
{\lmr Some text in Latin Modern}
\end{document}

Alternatively, if you are mainly using Computer Modern in your document, you can use \newfontfamily to define the alternative font.

As noted by Andrey Vihrov, the second solution is probably to be preferred, since the optical sizes of Latin Modern are set up when the font is loaded in the regular way. With the first solution, you would need to add the optical size information using the [SizeFeatures] option when declaring the \newfontfamily.

If you want to restore the defaults completely (rather than just have access to the Latin Modern fonts with a command) you can redefine \rmdefault, \sfdefault and \ttdefault instead (as suggested by Ulrike Fischer). This will override the \setmainfont settings.

\renewcommand\rmdefault{lmr}
\renewcommand\sfdefault{lmss}
\renewcommand\ttdefault{lmtt}

Edit note: Please note that the current version of this answer has been reorganized to reflect the discussion in the comments. Thanks.

Answer 2

As a default fontspec doesn't use computer modern but the latin modern font. To get back exactly the default setup set the font family to lmr, lmss, lmtt. Either localy or by redefining the defaults:

\documentclass{scrartcl}
\usepackage{fontspec}
\setmainfont{Times New Roman}
\setsansfont{Arial}
\setmonofont{Cambria}
\begin{document}
rm \texttt{tt} \textsf{sf}

{\fontfamily{lmr}\selectfont rm
 \fontfamily{lmss}\selectfont sf
 \fontfamily{lmtt}\selectfont tt}

\renewcommand\rmdefault{lmr}
\renewcommand\sfdefault{lmss}
\renewcommand\ttdefault{lmtt}
\normalfont
rm \textsf{sf} \texttt{tt} 
\end{document}

Answer 3

Old fontspec had a cm-default option. Now it is obsolete.

However, you can still switch back to OT1 or T1 font encoding with CM families. For example:

\documentclass{article}
\usepackage{fontspec}
\newfontfamily\xits{XITS}
\newfontfamily\cursor{TeX Gyre Cursor}
\usepackage[OT1]{fontenc}
\renewcommand\rmdefault{cmr}
\renewcommand\sfdefault{cmss}
\renewcommand\ttdefault{cmtt}
\begin{document}
This is Computer Modern Roman.

\textsf{This is Computer Modern Sans.}

\texttt{This is Computer Modern Typewriter.}

{\xits This is Times-like XITS font.}

{\cursor This is Courier-like TeX Gyre Cursor.}
\end{document}

This is obtained by pdffonts utility:

name                                 type              emb sub uni object ID
------------------------------------ ----------------- --- --- --- ---------
DQLQYU+CMR10                         Type 1C           yes yes no       4  0
ZSODJO+CMSS10                        Type 1C           yes yes no       5  0
YLHYBL+CMTT10                        Type 1C           yes yes no       6  0
EKZHDP+XITS-Identity-H               CID Type 0C       yes yes yes      8  0
PMNGJM+TeXGyreCursor-Regular-Identity-H CID Type 0C       yes yes yes     10  0

---

It's OK if you want to use EU1 (i.e. Unicode in XeTeX) as default font encoding. You can switch to OT1 encoding whenever you want:

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Linux Libertine O}
\usepackage[OT1,EU1]{fontenc}
\begin{document}
This is Linux Libertine O.

{\fontencoding{OT1}\fontfamily{cmr}\selectfont
This is Computer Modern Roman.}
\end{document}

name                                 type              emb sub uni object ID
------------------------------------ ----------------- --- --- --- ---------
BLJUZB+LinLibertineO-Identity-H      CID Type 0C       yes yes yes      5  0
ANBDAK+CMR10                         Type 1C           yes yes no       6  0