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+%% This is part of OpTeX project, see http://petr.olsak.net/optex
+
+\_codedecl \typosize {Font managing macros from OPmac <2020-04-28>} % loaded in format
+
+ \_doc -----------------------------
+ \`\typosize` `[<font-size>/<baselineskip>]` sets given parameters.
+ It sets text font size by the \^`\setfontsize` macro and math font sizes
+ by setting internal macros \^`\_sizemtext`, \^`\_sizemscript` and
+ \^`\_sizemsscript`. It uses common concept font thes sizes: 100\,\%,
+ 70\,\% and 50\,\%.
+ The \^`\_setmainvalues` sets the parameters as main values when
+ the `\_typosize` is called first.
+ \_cod -----------------------------
+
+\_protected\_def \_typosize [#1/#2]{%
+ \_textfontsize{#1}\_mathfontsize{#1}\_setbaselineskip{#2}%
+ \_setmainvalues \_ignorespaces
+}
+\_protected\_def \_textfontsize #1{\_if$#1$\_else \_setfontsize{at#1\_ptunit}\_fi}
+
+\_def \_mathfontsize #1{\_if$#1$\_else
+ \_tmpdim=#1\_ptunit
+ \_edef\_sizemtext{\_ea\_ignorept \_the\_tmpdim \_ptmunit}%
+ \_tmpdim=0.7\_tmpdim
+ \_edef\_sizemscript{\_ea\_ignorept \_the\_tmpdim \_ptmunit}%
+ \_tmpdim=#1\_ptunit \_tmpdim=0.5\_tmpdim
+ \_edef\_sizemsscript{\_ea\_ignorept \_the\_tmpdim \_ptmunit}%
+ \_fi
+}
+\_public \typosize ;
+
+ \_doc -----------------------------
+ \`\typoscale` `[<font-factor>/<baseline-factor>]` scales
+ font size and baselineskip by given factors in respect to current values.
+ It calculates the \^`\typosize` parameters and runs the \^`\typosize`.
+ \_cod -----------------------------
+
+\_protected\_def \_typoscale [#1/#2]{%
+ \_ifx$#1$\_def\_tmp{[/}\_else
+ \_settmpdim{#1}\_optsize
+ \_edef\_tmp{[\_ea\_ignorept\_the\_tmpdim/}\_fi
+ \_ifx$#2$\_edef\_tmp{\_tmp]}\_else
+ \_settmpdim{#2}\_baselineskip
+ \_edef\_tmp{\_tmp \_ea\_ignorept\_the\_tmpdim]}\_fi
+ \_ea\_typosize\_tmp
+}
+\_def\_settmpdim#1#2{%
+ \_tmpdim=#1pt \_divide\_tmpdim by1000
+ \_tmpdim=\_ea\_ignorept \_the#2\_tmpdim
+}
+\_public \typoscale ;
+
+ \_doc -----------------------------
+ \`\_setbaselineskip` `{<baselineskip>}` sets new `\baselineskip` and
+ more values of registers which are dependent on the `<baselineskip>`
+ including the \^`\strutbox`.
+ \_cod -----------------------------
+
+\_def \_setbaselineskip #1{\_if$#1$\_else
+ \_tmpdim=#1\_ptunit
+ \_baselineskip=\_tmpdim \_relax
+ \_bigskipamount=\_tmpdim plus.33333\_tmpdim minus.33333\_tmpdim
+ \_medskipamount=.5\_tmpdim plus.16666\_tmpdim minus.16666\_tmpdim
+ \_smallskipamount=.25\_tmpdim plus.08333\_tmpdim minus.08333\_tmpdim
+ \_normalbaselineskip=\_tmpdim
+ \_jot=.25\_tmpdim
+ \_maxdepth=.33333\_tmpdim
+ \_setbox\_strutbox=\_hbox{\_vrule height.709\_tmpdim depth.291\_tmpdim width0pt}%
+ \_fi
+}
+
+ \_doc -----------------------------
+ \`\_setmainvalues` sets the current font size and `\baselineskip`
+ values to the \`\mainfosize` and \hbox{\`\mainbaselineskip`} registers.
+ It redefines itself in order to set the main values only first.
+ \nl
+ \`\scalemain` returns to these values if they were set. Else they are set
+ to 10/12\,pt.
+ \_cod -----------------------------
+
+\_newskip \_mainbaselineskip \_mainbaselineskip=0pt \_relax
+\_newdimen \_mainfosize \_mainfosize=0pt
+
+\_def\_setmainvalues {%
+ \_mainbaselineskip=\_baselineskip
+ \_mainfosize=\_optsize
+ \_topskip=\_mainfosize \_splittopskip=\_topskip
+ \_ifmmode \_else \_bf \_it \_bi \_rm \_fi % load all basic variants of the family
+ \_normalmath % load fonts if \typosize is running first
+ \_let \_setmainvalues =\_setmainvaluesL
+}
+\_def\_setmainvaluesL {\_ifmmode \_normalmath \_else
+ \_rm \_everymath={\_normalmath}\_everydisplay={\_normalmath}\_fi}
+\_def\_scalemain {%
+ \_ifdim \_mainfosize=0pt
+ \_mainfosize=10pt \_mainbaselineskip=12pt
+ \_let \_setmainvalues=\_setmainvaluesL
+ \_fi
+ \_optsize=\_mainfosize \_baselineskip=\_mainbaselineskip
+}
+\_public \scalemain \mainfosize \mainbaselineskip ;
+
+ \_doc -----------------------------
+ \`\thefontsize` `[<size>]` and \`\thefontscale` `[<factor>]`
+ do modification of the size of the current font. They are implemented by the
+ \^`\newcurrfontsize` macro.
+ \_cod -----------------------------
+
+\_protected\_def\_thefontsize[#1]{\_if$#1$\_else
+ \_tmpdim=#1\_ptunit
+ \_newcurrfontsize{at\_tmpdim}%
+ \_fi
+ \_ignorespaces
+}
+\_protected\_def\_thefontscale[#1]{\_ifx$#1$\_else
+ \_tmpdim=#1pt \_divide\_tmpdim by1000
+ \_tmpdim=\_ea\_ea\_ea\_ignorept \_pdffontsize\_font \_tmpdim
+ \_newcurrfontsize{at\_tmpdim}%
+ \_fi
+ \_ignorespaces
+}
+\_public \thefontsize \thefontscale ;
+
+ \_doc -----------------------------
+ \`\em` keeps the weight of the current vaiant and switches
+ roman $\leftrightarrow$ italic. It adds the italic correction by
+ the \`\_additcorr` and \`\_afteritcorr` macros. The second does not
+ add italic correction if the next character is dot or comma.
+ \_cod -----------------------------
+
+\_protected\_def\_em {%
+ \_ea\_ifx \_the\_font \_tenit \_additcorr \_rm \_else
+ \_ea\_ifx \_the\_font \_tenbf \_bi\_aftergroup\_afteritcorr\_else
+ \_ea\_ifx \_the\_font \_tenbi \_additcorr \_bf \_else
+ \_it \_aftergroup\_afteritcorr\_fi\_fi\_fi
+}
+\_def\_additcorr{\_ifdim\_lastskip>0pt
+ \_skip0=\_lastskip \_unskip\_italcorr \_hskip\_skip0 \_else\_italcorr \_fi}
+\_def\_afteritcorr{\_futurelet\_next\_afteritcorrA}
+\_def\_afteritcorrA{\_ifx\_next.\_else\_ifx\_next,\_else \_italcorr \_fi\_fi}
+\_let\_italcorr=\/
+
+ \_doc -----------------------------
+ The \`\boldify` macro does `\let\it\bi` and `\let\normalmath=\boldmath`.
+ \_cod -----------------------------
+
+\_protected\_def \_boldify {%
+ \_let \_setmainvalues=\_setmainvaluesL
+ \_let\it =\_bi \_let\rm =\_bf \_let\_normalmath=\_boldmath \_bf
+}
+\_public \em \boldify ;
+
+ \_doc -----------------------------
+ We need to use a font selector for default pagination. Because we don't
+ know what default font size will be selected by the user, we use this
+ \`\_rmfixed` macro. It sets the `\rm` font from default font size
+ (declared by first \^`\typosize` command and redefines itself be only
+ the font switch for next pages.
+ \_cod -----------------------------
+
+\_def \_rmfixed {% used in default \footline
+ {\_ifdim\_mainfosize=0pt \_mainfosize=10pt \_fi
+ \_fontdef\_rmfixed{\_setfontsize{at\mainfosize}\_resetmod\_rm}%
+ \_global\_let\_rmfixed=\_rmfixed} % next use will be font switch only
+ \_rmfixed
+}
+\_let \rmfixed = \_tenrm % user can redefine it
+
+
+\_endcode % -------------------------------------
+
+History:
+2020-04-28 \boldify: removed \let\_rm=\_bf
+2020-04-14 \_setmainvaluesL: \_ifmmode test added
+2020-03-27 \_setmainvalues: \_splittopskip=\_topskip added