Re: Questions apon Questions

[Hans Hagen <pragma@wxs.nl>]

On 3-8-2012 10:18, Keith J. Schultz wrote:

> I have started going top down into the lua source in the normal MacTeX 2012
> distro. Just to learn how things are getting done.
>
> So here are my Questions
>
> 	1) Is GDEF still not supported in font.loader

Afaik at the tex end we don't need information stored in GDEF tables.

> 	2) Is GPOS still not supported in font.loader

GSUB and GPOS are supported as dropping any of them would render the 
whole machinery useless.

> 	3)  Are there any Program Specifictions anywhere to be had
> 	      and where

The luatex manual describes the tables. As the code comes from fontforge 
you can use the fontforge manuals (and program) as reference.

> 	4)  Any Class diagrams, flow charts, UML or similar documentation
> 	     and where for font manager and even Context or LuaTeX

The luatex manual. I'm working on a more detailed manual for font 
handling in context (but as we sometimes go beyond what opentype 
provides it will be somewhat specialized).

> 	5) Any of 3 and 4 in the source distribution?

The luatex manual is.

> 	6) Is the font.loader mainly in Lua or C? (I have not gotten that far yet?)
>             (only a couple hours of work done)

C producing a lua table

> 	7)  Can I safely assume that at that there enough modularization in the code
> 	      sothat I can work bottom up? That is add thing needed to the font.loader{} and
> 	      font{}

I guess so, that is: if you start patching the loader you need to spawn 
a separate entity of luatex (some derived work).

> 	8) Is there any special natural language convention when discussing Context inorder to
> 	     differentiate between  OT-Font-Table and Lua-Tables and data structures?

One of the things that context does is normalize and optimize the raw 
font data as provided by the loader. One can always print the tables (as 
used in context, using the table serializer).  The structure used is 
rather stable. There are also hooks to kick in extra code (for instance, 
context adds additional features.)

Hans


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