font sizes (again)

[Florian Wobbe <Florian.Wobbe@awi.de>]

Hi,

please regard this minimal example:

\setupbodyfont[10pt]
\starttext
\title{Title}
\section{Section}
{\switchtobodyfont[big] big}
{\switchtobodyfont[small] small}
{\tfxx tfxx}
{\tfx tfx}
{\tfa tfa}
{\tfb tfb}
{\tfc tfc}
{\tfd tfd}
\stoptext

Latin Modern Regular is available in different optical sizes - lmroman{5,6,7,8,9,10,12,17}-regular.otf - and as context is aware of these sizes (configured in typescripts) I wonder why they are not correctly assigned. This table indicates what happens instead:

\tfxx 6pt    -> lmroman6 (as expected)
\tfx  8pt    -> lmroman8 (as expected)
\tftf 10pt   -> lmroman10 (as expected)
\tfa  12.0pt -> lmroman10 (instead of lmroman12)
\tfb  14.4pt -> lmroman10 (instead of lmroman12)
\tfc  17.3pt -> lmroman10 (instead of lmroman17)
\tfd  20.7pt -> lmroman10 (instead of lmroman17)

\switchtobodyfont[small]  8pt  -> lmroman8 (as expected)
\switchtobodyfont[big]    12pt -> lmroman12 (as expected)

\title   17.3pt -> lmroman10 (instead of lmroman17)
\section 12pt   -> lmroman10 (instead of lmroman12)

The commands \title and \section and the font size switches \tfa, b, c, and d scale the font to the correct size, however, the wrong optical size is assigned. Note, this is not the case for \tfx, xx and \switchtobodyfont. Tested in MKIV and MKII (current beta).

Is this a bug or a feature?

Cheers
Florian

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