[luatex] OpenType problems

[Taco Hoekwater]

Javier Múgica wrote:
> I finally got started with LuaTex. I loaded OpenType fonts with the
> sample code form the wiki and the fixes suggested by Jonathan some
> months ago. I get this very different spacing with lmr10:
> 
> \input otffont.ltex  %Here is the callback
> \font\tenrm=ec-lmr10
> \font\ottenrm=LMRoman10-Regular
> 
> \setbox0 \hbox{\tenrm{} } \showthe\wd0
> 
> 3.33333 pt
> 
> \setbox0 \hbox{\ottenrm{} } \showthe\wd0
> 
> 2.5 pt
> 
> Any ideas how to solve it?

You have to fix the setting of f.parameters.space in the callback,
it should use the width of the actual space instead of a hardcoded
0.25 * size. Adding a

  if f.characters[32] then
      f.parameters.space = f.characters[32].width
  end

at the end (after all the other character calculations) should be
sufficient. A similar problem exists with the x_height parameter.

Best wishes,
Taco