Re: Auto selecting optical sizes for a font

[Hans Hagen <pragma@wxs.nl>]

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On 6/22/2013 1:43 AM, Andres Conrado Montoya wrote:
> Hello friends.
> I'm trying to design a book using the typescript you can find at the
> end of this message. I'm using the beautiful EBGaramond fonts from
> Georg Duffner (http://www.georgduffner.at/ebgaramond/). This font
> provides optical sizes to be used in different sizes (named "12" for
> 10.1pt or more, and "8" for 10 or less. These fonts automatically work
> as expected in latex, thanks to a recent package included in CTAN
> (ebgaramond package), selecting the correct font for the appropriate
> size. However, the typescript I'm using selects the "8" size for
> everything, without taking the type size into consideration. Is there
> any way to make ConTeXt do this automatic selection of fonts regarding
> of type size? I'm using version 2013.06.10 22:51.

We have no feature 'size' (or I must have forgotten about it). As there 
is no consistency in designsizes and there is always some esthetic 
choice involved no automatic mechanism is (and will be) build in.

However, as the traditional tex fonts come in designsizes we do have a 
way to deal with them via so called font goodies. I made you a goodie 
file for ebgaramond as well as typescript. (You need to convince Mojca 
to add the otf fonts to the distribution.)

Just put the goodie and typescript files in the base path and run mtxrun 
--generate after that. We need to choose a proper matching math font (or 
seek funding for a  gust garamond math font project).

The demo file shows how to kick in

Hans

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                                           Hans Hagen | PRAGMA ADE
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                                              | www.pragma-pod.nl
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[-- Attachment #2: ebgaramond.lfg --]
[-- Type: text/plain, Size: 1729 bytes --]

return {
    name = "eb garamond",
    version = "1.00",
    comment = "Goodies that complement eb garamond.",
    author = "Hans Hagen",
    copyright = "ConTeXt development team",
    designsizes = {
        ["EBGaramond-Italic"] = {
            ["8pt"]  = "file:EBGaramond08-Italic",
            ["9pt"]  = "file:EBGaramond08-Italic",
            ["10pt"] = "file:EBGaramond08-Italic",
            ["11pt"] = "file:EBGaramond12-Italic",
            ["12pt"] = "file:EBGaramond12-Italic",
            default  = "file:EBGaramond12-Italic",
        },
        ["EBGaramond-Regular"] = {
            ["8pt"]  = "file:EBGaramond08-Regular",
            ["9pt"]  = "file:EBGaramond08-Regular",
            ["10pt"] = "file:EBGaramond08-Regular",
            ["11pt"] = "file:EBGaramond12-Regular",
            ["12pt"] = "file:EBGaramond12-Regular",
            default  = "file:EBGaramond12-Regular",
        },
        ["EBGaramond-SC"] = {
            ["8pt"]  = "file:EBGaramond08-SC",
            ["9pt"]  = "file:EBGaramond08-SC",
            ["10pt"] = "file:EBGaramond08-SC",
            ["11pt"] = "file:EBGaramond12-SC",
            ["12pt"] = "file:EBGaramond12-SC",
            default  = "file:EBGaramond12-SC",
        },
        ["EBGaramond-Bold"] = {
            default  = "file:EBGaramond12-Bold",
        },
        ["EBGaramond-AllSC"] = {
            default  = "file:EBGaramond12-AllSC",
        },
        ["EBGaramond-Initials"] = {
            default  = "file:EBGaramondInitials",
        },
        ["EBGaramond-InitialsF1"] = {
            default  = "file:EBGaramondInitialsF1",
        },
        ["EBGaramond-InitialsF2"] = {
            default  = "file:EBGaramondInitialsF2",
        },
    }
}



[-- Attachment #3: type-imp-ebgaramond.tex --]
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%D \module
%D   [       file=type-imp-ebgaramond,
%D        version=2013.06.22,
%D          title=\CONTEXT\ Typescript Macros,
%D       subtitle=EB Garamond,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

\definefontfeature
  [eb-garamond-normal]
  [default]
  [mode=node,ccmp=yes,calt=yes,
   liga=yes,dlig=yes,hlig=yes,
   kern=yes,mark=yes,mkmk=yes,
   onum=yes,pnum=yes,salt=yes,
   script=latn]

\definefontfeature
  [eb-garamond-smallcaps]
  [eb-garamond-normal]
  [smcp=yes,c2sc=yes]

\starttypescriptcollection[ebgaramond]

    \starttypescript [serif] [ebgaramond]
        \loadfontgoodies[ebgaramond]
        \setups[font:fallback:serif]
        \definefontsynonym [Serif]       [file:ebgaramond-regular] [features=eb-garamond-normal]
        \definefontsynonym [SerifItalic] [file:ebgaramond-italic]  [features=eb-garamond-normal]
        \definefontsynonym [SerifBold]   [file:ebgaramond-bold]    [features=eb-garamond-normal]
        \definefontsynonym [SerifCaps]   [Serif]                   [features=eb-garamond-smallcaps]
    \stoptypescript

    \starttypescript[ebgaramond]
        \definetypeface [ebgaramond] [rm] [serif] [ebgaramond] [default] [designsize=auto]
        \definetypeface [ebgaramond] [tt] [mono]  [dejavu]     [default]
        \definetypeface [ebgaramond] [mm] [math]  [bonum]      [default]
    \stoptypescript

\stoptypescriptcollection

[-- Attachment #4: designsizes-003.tex --]
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\loadtypescriptfile[ebgaramond]

\definefontfeature
  [quality]
  [expansion=quality,
   protrusion=quality]

\definefontfeature
  [eb-garamond-normal]
  [eb-garamond-normal,quality]


\definefontfeature
  [eb-garamond-smallcaps]
  [eb-garamond-smallcaps,quality]

\setupbodyfont[ebgaramond,12pt]

\setupcapitals[sc=yes]

\setupbodyfontenvironment[default][em=italic]

\setupinterlinespace[line=3.2ex]

\setupalign[lesshyphenation,hz,hanging]

\showframe

\starttext

    \dostepwiserecurse {8} {12} {1} {
        \switchtobodyfont[#1pt]
        \input tufte
        \blank
    }

\stoptext

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