[NTG-context] Re: rendering arabic diacritics

[seyal zavira <seyal.zavira@gmail.com>]

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Of course!

i attached output file before and after applying new patch

On Thu, May 9, 2024 at 9:08 AM Hamid,Idris <Idris.Hamid@colostate.edu>
wrote:

>
>
> ------ Original Message ------
> From "Hans Hagen" <j.hagen@xs4all.nl>
> To "ntg-context@ntg.nl" <ntg-context@ntg.nl>
> Date 5/9/2024 6:29:40 AM
> Subject [NTG-context] Re: rendering arabic diacritics
>
> ** Caution: EXTERNAL Sender **
>
> 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
> <j.hagen@xs4all.nl>>>
> To "seyal.zavira@gmail.com <mailto:seyal.zavira@gmail.com
> <seyal.zavira@gmail.com>>"
> <seyal.zavira@gmail.com <mailto:seyal.zavira@gmail.com
> <seyal.zavira@gmail.com>>>; "mailing list
> for ConTeXt users" <ntg-context@ntg.nl <mailto:ntg-context@ntg.nl
> <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 <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%7Cc8b63025b08545aa636308dc70244f52%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638508548453863256%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=a2qMEGD0wo%2FhM6oNJ7AvfFyRPMEJuu0bFeceX4PPnsg%3D&reserved=0
> <https://drive.google.com/file/d/1hCcv6wqWjd-5GEKnaowh8E8YVbTgGqQr/view?usp=sharing>
> <
> 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%7Cc8b63025b08545aa636308dc70244f52%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638508548453873437%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=%2FLAHOebc2kdBEl4rBsEnp7gV4f6ZpXMWNt4FoUptSus%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?)
>
>
> Yes, marks should have zero-width but Uniscribe (and Harbuzz?/its
> successor?) provide support for legacy fonts with non-zero width.
>
> But sometimes font designers imitate legacy behavior..
>
> So it used to be often the case that a font with diacritics that worked in
> Uniscribe etc. (e.g., Deja Vu Arabic) would show marks with widths in
> ConTeXt.
>
> In order to be more helpful, I should update to the latest beta, run some
> tests, and get current on the status of these matters..
>
> Idris
> --
> Idris Samawi Hamid, Professor
> Department of Philosophy
> Colorado State University
> Fort Collins, CO 80523
>
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