Re: LuaTeX + microtype: Small Caps vs. Letter Spacing

[Hans Hagen <pragma@wxs.nl>]

On 15-6-2011 10:59, Ulrike Fischer wrote:

> With ConTeXt  ver: 2011.06.13 23:08 MKIV  fmt: 2011.6.15  (from the
> minimals) the following fails:

I have to admit that I never used \letterspacefont (luatex offers it as 
a pdftex compatibility feature and as such it's strongly related to 
traditional font handling). The command makes a copy of an internal 
(tfm) + adapted metrics.

> \starttext
>
> \font\test=file:fxlr.otf
> \test abc \letterspacefont\lspfont=\font 500 \lspfont blub

base mode i.e. traditional, so it works

> %breaks: letterspaced font is not small small caps:
> \font\test=file:fxlr.otf:mode=node;+smcp
> \test abc \letterspacefont\lspfont=\font 500 \lspfont blub

a font defined to use node mode, but the copy is a basemode one so it 
has regular shapes and no smallcaps (as there are changed on the fly)

> %letterspacefont works:
> \font\test=file:fxlr.otf:mode=base;+smcp
> \test abc \letterspacefont\lspfont=\font 500 \lspfont blub

base mode i.e. traditional, so it works

> \stoptext

So, when someone wants that feature he/she'd better force basemode which 
is no big deal as letterspacing is selectively applied to often known / 
specially defined fonts.

Anyhow, context users will not use that command / method but instead use 
\kerncharacters[fraction], as in:

{test {\kerncharacters[.5] test \bf test} test}

or

\setuphead
   [section]
   [style=\sca,
    textstyle={\kerncharacters[.5]}]

etc. Support using \letterspacefont is very unlikely to end up in the 
core font code.

Hans

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