Re: markup-command boxing the real printed ink?

[David Kastrup]

Valentin Petzel <valentin@petzel.at> writes:

> Hm, you’re right. But if you replace this by something directly drawn with 
> PostScript commands, you’ll see that Lilypond does not have any idea about 
> what’s there.

About what's *there*.  Namely in images drawn by *user-written*
PostScript code.

> So I guess Lilypond is able to handle stencil it knows very well.

And it knows by far most of them very well.

> And yes, Skylines are a concept of Lilypond, but Lilypond does not
> really „know” how the score looks. Lilypond thinks in objects that
> physically bounded by a skyline box. As you have shown, Lilypond is
> able to refine this into polygons for the standard symbols (for which
> we can quite easily find ways to get this actual information, as these
> things are eighter glyphs or lines).
>
> But this still does not solve the Problem that Lilypond is not
> actually able to „see” where there is black stuff in an arbitrary
> stencil.

Is there a particular purpose in shifting the goalposts until we have an
insoluble problem unrelated to what Harm is asking about?

-- 
David Kastrup