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+% $Id: efcode.tex 883 2022-06-08 17:30:43Z karl $
+% Public domain. Originally written by Han The THanh.
+% Example \efcode ("expansion factor code") settings
+% for per-glyph tuning of font expansions.
+%
+% Also includes a basic macro to enable font expansion, adjusting for
+% LuaTeX and pdfTeX.
+%
+% As written, this file does nothing but make definitions.
+% Adapt and adjust for your needs.
+%
+% Much more in the LaTeX microtype package (https://ctan.org/pkg/microtype).
+
+\newcount\temploopefcode
+\def\resetefcode#1{% reset all to 1000
+ \temploopefcode=0
+ \loop
+ \efcode#1\temploopefcode=1000
+ \advance\temploopefcode 1
+ \ifnum\temploopefcode < 256 \repeat
+}
+
+\def\setefcode#1{%
+ \efcode#1`\2=700
+ \efcode#1`\3=700
+ \efcode#1`\6=700
+ \efcode#1`\8=700
+ \efcode#1`\9=700
+ \efcode#1`\A=500
+ \efcode#1`\B=700
+ \efcode#1`\C=700
+ \efcode#1`\D=500
+ \efcode#1`\E=700
+ \efcode#1`\F=700
+ \efcode#1`\G=500
+ \efcode#1`\H=700
+ \efcode#1`\K=700
+ \efcode#1`\M=700
+ \efcode#1`\N=700
+ \efcode#1`\O=500
+ \efcode#1`\P=700
+ \efcode#1`\Q=500
+ \efcode#1`\R=700
+ \efcode#1`\S=700
+ \efcode#1`\U=700
+ \efcode#1`\W=700
+ \efcode#1`\Z=700
+ \efcode#1`\a=700
+ \efcode#1`\b=700
+ \efcode#1`\c=700
+ \efcode#1`\d=700
+ \efcode#1`\e=700
+ \efcode#1`\g=700
+ \efcode#1`\h=700
+ \efcode#1`\k=700
+ \efcode#1`\m=700
+ \efcode#1`\n=700
+ \efcode#1`\o=700
+ \efcode#1`\p=700
+ \efcode#1`\q=700
+ \efcode#1`\s=700
+ \efcode#1`\u=700
+ \efcode#1`\w=700
+ \efcode#1`\z=700
+}
+
+% emacs-page
+% Different primitives for LuaTeX and pdfTeX.
+% This fragment courtesy of Robert Schlicht,
+% https://tex.stackexchange.com/questions/646769. Public domain.
+%
+\input iftex.sty
+\ifluatex
+ \adjustspacing=2
+ \def\mtplnfontexpand#1{%
+ \expandglyphsinfont #1 20 20 1\relax}
+\else
+ \pdfadjustspacing=2
+ \def\mtplnfontexpand#1{%
+ \pdffontexpand #1 20 20 1 autoexpand\relax}
+\fi
+% enable for these fonts.
+%\mtplnfontexpand\tenrm
+%\mtplnfontexpand\tensl
+%\mtplnfontexpand\tenbf
+
+%\hsize=2.2in
+%\input story
+%\bye