Re: [NTG-context] another font loading error

22 Aug 2016

      Wolfgang,

thanks for looking into it!

does this mean there is some bug in CONTEXT/LuaTeX font loading or
something wrong with the font?  i looked at the history on bitbucket mirror
and the problem seems to have started when we moved from 2016-08-11 14:00:00
 to 2016-08-15 22:45:00.

the offending lines in tex/context/base/mkiv/font-ots.lua (line 3762) has

kerns={
 [1705]={
  [2]={ 0, 0, -290, 0 },
 },
 [1707]={
  [2]={ 0, 0, -290, 0 },
 },
 [1711]={
  [2]={ 0, 0, -290, 0 },
 },
 [64400]={
  [2]={ 0, 0, -290, 0 },
 },
 [64404]={
  [2]={ 0, 0, -290, 0 },
 },
 [64469]={
  [2]={ 0, 0, -290, 0 },
 },
 [65243]={
  [2]={ 0, 0, -290, 0 },
 },
 [983071]={
  [2]={ 0, 0, -290, 0 },
 },
}

and with k, v = 1705, { 0, 0, -290, 0 }, we want to dereference v[1][3],
which leads to an error.  prior to this change, the code was looking up
v[3] (which would result in nil but no further dereferencing to cause an
error).  i checked that this part of the table was the same with the
previous version (from 08-08).

—MHB

On Mon, Aug 22, 2016 at 11:45 AM, Wolfgang Schuster <
schuster.wolfgang@gmail.com> wrote:
...
Mohammad Hossein Bateni 
22. August 2016 um 17:01
Hello,
After the upgrade to latest beta (from 08.08 21:28), I cannot load many of
my Persian fonts (one uploaded here http://mhbateni.com/context/bug-03/
for testing).  It works on "current" without any issues but not on "beta".
Find an MWE as well as the error message below.  (I did test on a fresh
standalone version as well.)
\starttext
\definedfont[HMXNiloofar*arabic]
Salam
\stoptext
When I change the value from the "hasspacekerns" variable (after deleting
hm-xniloofar.tmc) in hm-xniloofar.tma from true to false the font is loaded
without errors.
hm-xniloofar.tma (line 7147 ff):
["properties"]={
  ["hascolor"]=false,
  ["hasitalics"]=false,
  ["hasspacekerns"]=true,
 },
Wolfgang
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