The microtype package

IMPLEMENTATION: Font setup 54895 896 }897 We need a font (the minimal class doesn’t load one).898 \expandafter\ifx\the\font\nullfont\normalfont\fi14.2 Font setup\MT@setupfontSetting up a font entails checking for each feature whether it should be applied tothe current font (\MT@font). But first, we might have to disable stuff when usedtogether with adventurous packages.899 900 \def\MT@setupfont{\MT@setupfont@hook}This will use a copy of the font (allowing for expansion parameter variation andthe use of more than one set of protrusion factors for a font within one paragraph).901 \MT@requires@pdftex7{902 \g@addto@macro\MT@setupfont\MT@copy@font903 }\relaxThe font properties must be extracted from \MT@font, since the current value of\f@encoding and friends may be wrong!904 \g@addto@macro\MT@setupfont{%905 \MT@exp@two@c\MT@split@name\string\MT@font/\@nilTry to find a configuration file for the current font family.906 \MT@exp@one@n\MT@find@file\MT@family907 \ifx\MT@familyalias\@empty \else908 \MT@exp@one@n\MT@find@file\MT@familyalias\fiWe have to make sure that \cf@encoding expands to the correct value (for later, in\MT@get@slot), which isn’t the case when \selectfont chooses a new encoding(this would be done a second later in \selectfont, anyway – three lines, to beexact). (I think, I do not need this anymore – however, I’m too afraid to remove it.. . . Oops, I did it. Let’s see whether anybody complains.)909 % \ifx\f@encoding\cf@encoding\else\@@enc@update\fi910 }Tracking has to come first, since it means actually loading a different font.911 \MT@requires@pdftex6912 \MT@requires@luatex3913 {\g@addto@macro\MT@setupfont\MT@tracking}\relax914 \g@addto@macro\MT@setupfont{%915 \MT@check@font916 \ifMT@inlist@917 \MT@show@pdfannot2%918 \else919 \MT@vinfo{Setting up font `\MT@@font’\on@line}%Now we can begin setting up the font for all features that the current pdfTEXprovides. The following commands are \let to \relax if the respective feature isdisabled via package options.For versions older than 1.20, protrusion has to be set up first, beginning with1.20, the order doesn’t matter.920 \MT@protrusion921 \MT@expansion922 }Interword spacing and kerning (pdfTEX 1.40).