[luatex] LuaTeX file almost 2.5x bigger
Hans Hagen
pragma at wxs.nl
Tue Jul 27 19:26:13 CEST 2010
On 26-7-2010 10:58, Pablo Rodríguez wrote:
> Sorry, but I'm afraid I don't get your point here (sorry if I
> misunderstood your comment).
font expansion can be tuned in several ways:
- the number of steps
- factors per glyph
the first one is not that relevant as in the current expansion machinery
each 'line' gets an expansion factor that gets applied to all glyphs in
that line
however, if you assign different ef codes to glyphs it might be that
within a line there are many changes in horizontal scaling
now, in pdftex, pseudo fonts are uses, so there many steps lead to many
font instances being included, while in luatex the font is included once
and transform matrices are injected ... the trade off is hard to
predict, but when it was introduced we did experiments that actually
gave smaller files so it all depends on the circumstances
there are a couple of other approaches to hz like optimization but
that's beyond this thread
in luatex we try to keep things clean and simple and the current
approach qualifies as such; of course we can try to minimize a couple of
side effects (for instance of scaling) when they don't interfere with
what you get on paper, so future versions might produce smaller files;
but it's not a priority
Hans
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