\fontdimen in LuaMetaTeX

\fontdimen in LuaMetaTeX

[Marcel Fabian Krüger]

Hi,

recent LuaMetaTeX versions no longer automatically resize the fontdimen
arrays on assignments.
Is there a way to manually resize them or is it necessary to reload a
patched font you want more fontdimens?

Also, there is an issue with the error message (I guess) for font.setfontdimen:

\starttext
\directlua{font.setfontdimen(0, 8, 0)}
\stoptext

gives

token call, execute: invalid option '%i' to 'lua_pushfstring'
stack traceback:
	[C]: in function 'font.setfontdimen'
	[ctxlua]:1: in main chunk

1     \starttext
2 >>  \directlua{font.setfontdimen(0, 8, 0)}
3     \stoptext
4     

Best regards,
Marcel
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Re: \fontdimen in LuaMetaTeX

[Hans Hagen]

On 8/3/2020 7:57 PM, Marcel Fabian Krüger wrote:
> Hi,
> 
> recent LuaMetaTeX versions no longer automatically resize the fontdimen
> arrays on assignments.

indeed, using font dimens for other purposes than fonts is pre-etex 
hackery that (c|sh)ould have been abandoned decades ago

> Is there a way to manually resize them or is it necessary to reload a
> patched font you want more fontdimens?

no (tex uses the first 7 in text mode and some more in traditional math 
fonts but even those get remapped) ... if a font needs more then it's 
probably at the lua end and one then can deal with additional properties 
differently

> Also, there is an issue with the error message (I guess) for font.setfontdimen:
> 
> \starttext
> \directlua{font.setfontdimen(0, 8, 0)}
> \stoptext
> 
> gives
> 
> token call, execute: invalid option '%i' to 'lua_pushfstring'
> stack traceback:
> 	[C]: in function 'font.setfontdimen'
> 	[ctxlua]:1: in main chunk
> 
> 1     \starttext
> 2 >>  \directlua{font.setfontdimen(0, 8, 0)}
> 3     \stoptext
> 4
ok, lua only handles %d, so i'll fix that, but all that code is in flux 
anyway, definitely undocumented

Hans

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                                           Hans Hagen | PRAGMA ADE
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