[NTG-context] Re: rendering arabic diacritics

9 May 2024


      ...
Hi Seyal,
See below:
------ Original Message ------
 From "Hans Hagen" mailto:j.hagen@xs4all.nl>
To "seyal.zavira@gmail.com mailto:seyal.zavira@gmail.com" 
mailto:seyal.zavira@gmail.com>; "mailing list 
for ConTeXt users" mailto:ntg-context@ntg.nl>
Date 5/9/2024 3:31:45 AM
Subject [NTG-context] Re: rendering arabic diacritics
...
** Caution: EXTERNAL Sender **
On 5/9/2024 10:03 AM, seyal.zavira@gmail.com 
mailto:seyal.zavira@gmail.com wrote:
...
Hi all,
when i want to use the linked font for arabic texts it doesn't render 
diacritics properly
i doesn't have problem with this font in inkscape or libreoffice
what featureset should i apply?
font link:
https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1hCcv6wqWjd-5GEKnaowh8E8YVbTgGqQr%2Fview%3Fusp%3Dsharing&data=05%7C02%7CIdris.Hamid%40ColoState.EDU%7C8e2b7a1a4eaf46f6b10808dc700b7b2a%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638508441848485171%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=51bK7I53UxZOK0PcbrYlpX2s%2Bdy%2BK83SslQZ%2BvhnvwU%3D&reserved=0 https://drive.google.com/file/d/1hCcv6wqWjd-5GEKnaowh8E8YVbTgGqQr/view?usp=s...
this is my MWE:
\definefontfeature [arabis]
[mode=node,language=dflt,script=arab,
init=yes,medi=yes,fina=yes,isol=yes,
liga=yes,dlig=yes,rlig=yes,clig=yes,
mark=yes,mkmk=yes,kern=yes,curs=yes]
\definefont [Ahang] [file:Ahang-Regular.otf*arabis at 18pt]
\setupalign[r2l]
\starttext
{\Ahang تَشْكِيل كَسْرَة}
\stoptext
\definefont [Ahang] [file:Ahang-Regular.otf*arabic at 18pt]
but there is an issue with widths, ill send you a patch to test
The provided "*arabic" featureset should suffice for this font. Also 
TEXpage is useful for this kind of MWE:
\definefont [Ahang] [file:Ahang-Regular.otf*arabic at 18pt]
\setupalign[r2l]
\startTEXpage[offset=1em]
{\Ahang تَشْكِيل  كَسْرَة}
\stopTEXpage
In prehistoric ConTeXt version
   2023.09.26 18:19
the diacritics look fine in both ConTeXt and unicode editor MS Notepad.
So if there is something wrong, it must be in a more recent version.
For comparison: Before applying Hans' patch, could you kindly send your 
pdf of the MWE that shows the error? Mine is attached.
Ahang-Regular has no width settings for the marks so we need to zero
On 5/9/2024 2:17 PM, Hamid,Idris wrote:
them. Tahrir_Regular has widths but these we explictly need to zero with 
a pseudo feature then. (What are the assumptions when we do arabic? That 
marks are to have zero width?)

Hans

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