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Diffstat (limited to 'macros/luatex/optex/fonts-resize.opm')
-rw-r--r-- | macros/luatex/optex/fonts-resize.opm | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/macros/luatex/optex/fonts-resize.opm b/macros/luatex/optex/fonts-resize.opm new file mode 100644 index 0000000000..4a7bf75468 --- /dev/null +++ b/macros/luatex/optex/fonts-resize.opm @@ -0,0 +1,214 @@ +%% This is part of OpTeX project, see http://petr.olsak.net/optex + +\_codedecl \setfontsize {Font resizing macros <2020-01-23>} + +%% resizefont variant-name \fontswitch, for example \resizefont{bf}\_tenbf + +\_def\_resizefont#1#2{% + \_edef\_whatresize{#1}% + \_ifx \_fontselector \_undefined \_doresizefont#2% + \_else \_ea \_doresizefont \_fontselector \_fi + \_slet{_tryload#1}{_relax}% +} +\_def\_doresizefont#1{\_logfont{#1}% + \_ea\_font\_ea#1\_ea\_rfontskipat + \_fontname \_cs{_ten\_whatresize} \_relax\_space \_sizespec \_relax +} +\_def\_logfont#1{} % default is no logging of used fonts + +\_def\_rfontskipat#1{\_ifx#1"\_ea\_rfskipatX \_else\_ea\_rfskipatN\_ea#1\_fi} +\_def\_rfskipatX #1" #2\_relax{"\_whichtfm{#1}"} +\_def\_rfskipatN #1 #2\_relax{\_whichtfm{#1}} + +%% \setfontsize{at<size>} or \setfontsize{scaled<size>} + +\_newdimen \_optsize \_optsize=10pt +\_newdimen \_defaultoptsize \_defaultoptsize=10pt + +\_def\_setfontsize #1{% + \_edef\_sizespec{#1}% + \_ea \_setoptsize \_sizespec\_relax + \_reloading +} +\_def\_reloading{\_loadf{rm}\_tenrm \_loadf{bf}\_tenbf + \_loadf{it}\_tenit \_loadf{bi}\_tenbi +} +\_def\_loadf#1#2{\sdef{_tryload#1}{\_resizefont{#1}#2}} +\_def\_tryloadtt{\fontlet\_tentt=\_tentt \_sizespec\_relax} + +\_def\_setoptsize {\_isnextchar a{\_setoptsizeA} + {\_isnextchar m{\_setoptsizeC}{\_setoptsizeB}}} +\_def\_setoptsizeA at#1\_relax{\_optsize=#1\_relax} % at<dimen> +\_def\_setoptsizeB #1\_relax{\_optsize=\_defaultoptsize\_relax} % scaled<scalenum> +\_def\_setoptsizeC mag#1\_relax{% + \_optsize=\_pdffontsize\_font \_optsize=#1\_optsize \_edef\_sizespec{at\_the\_optsize}} + +\_setfontsize{at10pt} % default size +\_let\_tryloadrm=\_relax +\_let\_tryloadbf=\_relax +\_let\_tryloadit=\_relax +\_let\_tryloadbi=\_relax + +\_def\_regtfm #1 0 #2 *{\_ea\_def \_csname _#1:reg\_endcsname{#2 16380 \_relax}% + \_def\_tmpa{#1}\_reversetfm #2 * % +} +\_def\_reversetfm #1 #2 {% we need this data for \_setmathfamily + \_ea\_let\_csname _#1:reg\_ea\_endcsname + \_csname _\_tmpa:reg\_endcsname + \_if*#2\_else \_ea\_reversetfm \_fi +} +\_def\_whichtfm #1{% + \_ifcsname _#1:reg\_endcsname + \_ea\_ea\_ea \_dowhichtfm + \_csname _#1:reg\_ea\_endcsname + \_else + #1% + \_fi +} +\_def\_dowhichtfm #1 #2 {% + \_ifdim\_optsize<#2pt #1\_ea\_ignoretfm\_else \_ea\_dowhichtfm +\_fi +} +\_def\_ignoretfm #1\_relax{} + +% \fontdef \new {\<modifiers>\<var-selector>} +\_def \_fontdef #1#2{\_begingroup + \_ifx\_fontselector\_undefined \_def\_fontselector{#1}\_fi + #2% + \_ea \_keepmeaning \_fontselector \_endgroup +} +\_def\_fontlet#1#2{\_ifx #2=\_ea\_fontlet \_ea#1\_else + \_ea\_font\_ea#1\_ea\_rfontskipat\_fontname#2 \_relax\_space \_fi +} +\_def \_keepmeaning #1#2{\_global\_let\_keepmeaningdata=#1% + #2\_let#1=\_keepmeaningdata \_global\_let\_keepmeaningdata=\_undefined +} +\_protected \_def \_currvar{\_cs{_currvar:\_ea \_xstring \_the\_font}} +\_sdef{_currvar:_tenrm}{\_rm} +\_sdef{_currvar:_tenbf}{\_bf} +\_sdef{_currvar:_tenit}{\_it} +\_sdef{_currvar:_tenbi}{\_bi} +\_sdef{_currvar:_tentt}{\_tt} + +\_def \_newcurrfontsize #1{% \newcurrfontsize{at25pt} + \_edef\_tmp{\_ea\_xstring \_the\_font}% + \_ea \_fontlet \_csname \_tmp\_ea\_endcsname \_the\_font \_space #1\_relax + \_csname \_tmp\_endcsname +} + +\_def \_truetenrm {% used in default \footline + \_fontdef\_truetenrm{\_setfontsize{at10pt}\rm}% + \_global\_let\_truetenrm=\_truetenrm % next use will be font switch only + \_truetenrm +} + +%% Optical sizes data for preloaded Latin Modern fonts: + +\_regtfm lmr 0 ec-lmr5 5.5 ec-lmr6 6.5 ec-lmr7 7.5 ec-lmr8 8.5 ec-lmr9 9.5 + ec-lmr10 11.1 ec-lmr12 15 ec-lmr17 * +\_regtfm lmbx 0 ec-lmbx5 5.5 ec-lmbx6 6.5 ec-lmbx7 7.5 ec-lmbx8 8.5 ec-lmbx9 9.5 + ec-lmbx10 11.1 ec-lmbx12 * +\_regtfm lmri 0 ec-lmri7 7.5 ec-lmri8 8.5 ec-lmri9 9.5 ec-lmri10 11.1 ec-lmri12 * +\_regtfm lmtt 0 ec-lmtt10 11.1 ec-lmtt12 * + +\_public + \setfontsize \newcurrfontsize \fontdef \fontlet \currvar \defaultoptsize ; + +\_endcode %--------------------------------------------------- + +This code is inspired from csfontsm.tex file. + +\sec Scaling fonts to diferent sizes in text mode (low-level macros) +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +There are four basic font-variant selectors `\rm`, `\bf`, `\it`, `\bi`. +Once a font family is loaded (for example fonts decalred in the format in +the `fonts-preloaded.opm` or loaded by `\fontfam`) then you can resize these +fonts using `\setfontsize{<sizespec>}`, for example `\setfontsize{at12pt}` +or `\setfontsize{scaled1300}`. Note that the word `at` or `scaled` must be +present here. This command itself does not rescaling, this is done at the +first moment you use next `\rm`, `\bf`, `\it` or `\bi` selectors. +Example. Assume that we are printing at 10pt and we use: + +\begtt + \setfontsize{at15pt} ...still at 10pt... \rm ...now the text is at15pt... + \bf bold is at 15pt too ... +\endtt + +More meaningful is to use first variant selector immediatelly after +`\setfontsize` command. There is a special "variant selector" `\currvar` +which reloads the font from current variant, for example + +\begtt + \it italics at10pt \setfontsize{at7pt}\currvar italics at 7pt. +\endtt + +If you are using font families by `\fontfam` then you can use more "font +modifiers". The `\setfontsize` command is only one of such font modifier. All font +modifiers does not actual change of fonts but first usage of a variant selector +takes this setting. See `fonts-select.opm` for more information about it. + +You can declare `\<newfont>` which behaves as natural font switch declared +by `\font`: + +\begtt + \fontdef \<newfont> {<modifiers> \<variant-selector>} + example: + \fontdef \bigfont {\setfontsize{at15pt}\bf} +\endtt + +This command runs `<modifiers> \<variant-selector>` in a group and sets the +resulting current font as `\<newfont>`. + +The parameter of the `\fontdef` macro needs to be finalized by one of the +four standard variant selectors (or `\currvar`). + +We have another command for scaling: `\fontlet` which is able to resize +arbitrary font. The font must be presented by \<fontswhitch>, i.e. by +`\_tenrm`, `\_tenbf` etc. or arbitrary font switch you declared it by +`\font` primitive or `\fontdef` macro. The usage is: + +\begtt + \fontlet \<newfont> = \<fontswitch> <sizespec> + example: + \fontlet \bigfont = \_tenbf at15pt +\endtt + +The resulted `\bigfont` is the same as in previous example where `\fontdef` +was used. The advantage of `\fontdef` macro will be more clear when you load +font families by `\fontfam` and you are using more font modifiers declared +in such families. + +The `\newcurrfontsize{<sizespec>}` resizes immediatelly current font. +No others fonts are resized. + +The parameter of `\setfontsize` should be in the format `at<dimen>` or +`scaled<scalenum>` or `mag<coefficient>`. The first two are know from +classical \TeX/. The third sets new font size to <coefficient> multiplied by +current font size (declared by at<dimen> or mag<coefficient>). For example +if we have do `\setfontsize{at12pt}` and next we write +`\setfontsize{mag1.5}\rm` then the current font size is `at19pt`. You can +define a funny macro `\bigger`: + +\begtt + \def\bigger {\setfontsize{mag1.3}\currvar} + text \bigger text \bigger text \bigger text... +\endtt + +\secc Optical sizes + +There are font families with more font files where almost the same font is +implemented in various design sizes: `cmr5`, `cmr6`, `cmr7`, `cmr8`, `cmr9`, +`cmr10`, `cmr12`, `cmr17` for example. This feature is called "optical +sizes". \OpTeX/ chooses a font with an optical size closest to desired size +specified by `\setfontsize`, when `at<dimen>` or `mag<coefficient>` is used. +When `scaled<scalenum>` is used then optical size is choosen using the value +of the `\defaultoptsize` register and such font is scaled by the specified +<scalenum>. There is `\defaultoptsize=10pt` by default. + + +\secc Implementation notes + +... to do ... + + |