Re: [NTG-context] new version

[Marcus Vinicius Mesquita via ntg-context <ntg-context@ntg.nl>]

Should then \setupalign[granular] be used before defining font features?

On Thu, Jun 22, 2023 at 9:37 AM Hans Hagen via ntg-context
<ntg-context@ntg.nl> wrote:
>
> Hi,
>
> I uploaded a new lmtx version (so the next series will be luametatex
> 2.10.10). Although Mikael and I are still in improving math mode, we
> side tracked a bit to the par builder (better breaking of math etc). In
> the end some experiments there turned features.
>
> (1) We already had a more granular par builder but that was never really
> enabled. From now on you can do that with
>
> \setupalign[granular]
>
> After quite some tests and careful inspection of outcome we think that
> the results look better, which is why if could become a default. The
> main impact is a bit more even spacing between neighbouring lines,
> because we operate in five instead of three ranges of primary badness now.
>
> (2) As side effect of (3) initialization of expansion (as well as
> compression and protrusion) is delayed till it kicks in. This means that
>
> \definefontfeature[default][default][expansion=quality]
>
> has become cheaper and might as well become the default.
>
> (3) The biggest new feature (already known to some of you as we chat
> about it) is that in addition to the (upto three) passes that create a
> paragraph we can now have extra ones. This is discussed in
> lowlevel-lines.pdf (preliminary). The second pass is the most important
> one (it uses hyphenation but not yet emergency stretch) and, based on
> criteria that can be set, between the second and third pass multiple
> attempts can be triggered.
>
> So, for instance one can start careful (pass one), less careful (pass
> two), test all kind of variants (pass 2 subpasses) etc. These subpasses
> can have different tolerances, demerits, expansion, etc and quit once
> soem criteria are met.
>
> The problem here is: what makes good defaults. Therefore we have some
> tests definitions added (see spac-pas-tests) that we hope users will
> test on realistic documents.
>
> In case one wonders: performance is quite okay and you won't notice much
> difference on a reasonable run. Also, when you normally use expansion
> for a whole document, you can now let it kick in more selectively. As a
> result a run can be faster and the resulting pdf file can be smaller.
> This feature kind of assumes (1) above.
>
> (4) There's also a new feature for optional content: you can have marked
> sections in a paragraph that can be enabled or disabled in attempts to
> get better output. Of course one can wonder it this is useful but it was
> one of the older todo's. When it is considered usefull it can evolve.
>
> (The lowlevel-lines manual is work in progress and in a few weeks we
> will pick up on that.)
>
> Hans
>
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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