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%%^^A%% fontspec-doc-luatex.tex -- part of FONTSPEC <wspr.io/fontspec>
\documentclass[a4paper]{l3doc}
\usepackage{fontspec-doc-style}
\showexamplesfalse
\begin{document}
\part{\LuaTeX-only font features}
\label{sec:luatex-features}
\section{Custom font features}
Pre-2016, it was possible to load an OpenType font feature file to define new OpenType features for a selected font. This facility was particularly useful to implement custom substitutions, for example. As of \TeX{}Live~2016, \LuaTeX/\pkg{luaotfload} no longer supports this feature, but provides its own internal mechanisms for an equivalent interface.
Any documents using `feature file' options will need to transition to the new interface.
Figure~\ref{fig:featurefile} shows an example.
Please refer to the \LuaTeX/\pkg{luaotfload} documentation for more details.
\begin{figure}
\caption{An example of custom font features.}
\label{fig:featurefile}
\hrule
\begin{Verbatim}
\documentclass{article}
\usepackage{fontspec}
\directlua{
fonts.handlers.otf.addfeature {
name = "oneb",
type = "substitution",
data = {
["1"] = "one.ss01",
}
}
}
\setmainfont{Vollkorn-Regular.otf}[RawFeature=+oneb]
\begin{document}
1234567890
\end{document}
\end{Verbatim}
\hrule
\end{figure}
\end{document}
% /©
% ------------------------------------------------
% The FONTSPEC package <wspr.io/fontspec>
% ------------------------------------------------
% Copyright 2004-2019 Will Robertson, LPPL "maintainer"
% Copyright 2009-2015 Khaled Hosny
% Copyright 2013 Philipp Gesang
% Copyright 2013-2016 Joseph Wright
% ------------------------------------------------
% This package is free software and may be redistributed and/or modified under
% the conditions of the LaTeX Project Public License, version 1.3c or higher
% (your choice): <http://www.latex-project.org/lppl/>.
% ------------------------------------------------
% ©/
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