[NTG-context] Re: rendering arabic diacritics

[Hans Hagen <j.hagen@xs4all.nl>]

On 5/9/2024 2:17 PM, Hamid,Idris wrote:
> Hi Seyal,
> 
> See below:
> 
> ------ Original Message ------
>  From "Hans Hagen" <j.hagen@xs4all.nl <mailto:j.hagen@xs4all.nl>>
> To "seyal.zavira@gmail.com <mailto:seyal.zavira@gmail.com>" 
> <seyal.zavira@gmail.com <mailto:seyal.zavira@gmail.com>>; "mailing list 
> for ConTeXt users" <ntg-context@ntg.nl <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=sharing>
>>> 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 
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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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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