Hi,
As you know, lmtx is also a place for experiments. Currently I'm playing
a bit with fonts. Recently (as mentioned a whil eback) I added glyph
scaling which permits interesting trickery, although one needs to be
aware of how it combines with other features. Here's an example:
\def\UnKernedTeX
{T%
{\glyph xoffset -.2ex yoffset -.4ex `E}%
{\glyph xoffset -.4ex options "C0 `X}}
\dorecurse{100}{ x \UnKernedTeX}
There are alse \glyphxscale cum suis but again, beware that it might
influence things when not used grouped.
At some point this will be an option in scaled fonts (think of \tfc and
such). It saves instances. You can get an idea with:
\enableexperiments[text.fonts.compact]
The 'text' in this command suggests that we can also do that with math
and indeed we have
\enableexperiments[math.fonts.compact]
These directives have to come *before* loading fonts in order to be
effective. Especially the math can bring down the number of font
instances: text, script and scriptscript all use the same instance,
which is good news. The bad news is that it's up to users to check how
this plays out. There are some differences due to the fact that scaling
happens elsewhere and otherwise which results in tiny differences (4/5th
decimal).
As said, these are experiments so ity might progress. I post
intermediate versions because that way I can control it better. There is
another variant in the planning.
Yet another expriment (undecided if that will stay, i played with if
before and then rejected it):
\enabledirectives[fonts.injections.method=advance]
If it stays I probbably have to patch some other code to better suit it.
Overall, although in math it add to the overhead, due to the fact that
math is hardly demanding (makes only a fraction of the rendering) the
memory footprint can be quite a bit lower and performance a bit better
(not that much). The measures used in rendering are kind of floating
(recalculated often) when these mechanisms are enabled but my impression
is that todays compilers make that hardly noticeable.
As usual, it opens up possibilities, but of course at the price of
testing.
Hans
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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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