VORG and vmtx table in fontloader

VORG and vmtx table in fontloader

[Hironori KITAGAWA]

Hello all,

It seems that ConTeXt's fontloader (hence luaotfload's fontloader) 
skips to load the VORG table and topSideBearing in the vmtx table
These informations are used to get the vertical origin of a glyph.

> readers.vorg = function(f,fontdata,specification)
>     reportskippedtable(f,fontdata,"vorg",specification.glyphs)
> end

> readers.vmtx = function(f,fontdata,specification)
> ...
>         for i=0,nofmetrics-1 do
>          ... 
>             if vheight ~= 0 and vheight ~= vdefault then
>                 glyph.vheight = vheight
>             end
>          -- if topsidebearing ~= 0 then
>          --     glyph.tsb = topsidebearing
>          -- end

I don't know whether vertical metrics are used in ConTeXt.
But, they will be useful for other packages (e.g., LuaTeX-ja)
to improve vertical typesetting.

Regards
Hironori KITAGAWA
<h_kitagawa2001@yahoo.co.jp>
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________