[HarfBuzz] kaithi & arabic : glyphs that span number

[Behdad Esfahbod]

NotoSansArabic has no special rules to make the U+0600 character work
properly.

behdad
http://behdad.org/


On Fri, Dec 2, 2022 at 1:10 PM Behdad Esfahbod <behdad at behdad.org> wrote:

> Hi Madhu,
>
> I checked the Kaithi font. It has no rules for U+110BC character. But if
> you use U+110BD you get the desired result.
>
> I have not checked the Arabic font.
>
> behdad
> http://behdad.org/
>
>
> On Wed, Nov 30, 2022 at 2:15 AM Madhu <enometh at meer.net> wrote:
>
>> In April 2002, Sameer Singh posted a message on emacs-devel where he
>> demonstrated the use of harfbuzz numerals with the kaithi script
>>
>> https://lists.gnu.org/archive/html/emacs-devel/2022-04/msg01297.html
>> to yield this image:
>>
>> [1]
>> https://lists.gnu.org/archive/html/emacs-devel/2022-04/png4ClBZc1zV4.png
>>
>> There the first glyph spans the remaining chacracters when composed.
>>
>> I tried to reproduce it and showed my work on this message
>>
>> https://lists.gnu.org/archive/html/emacs-devel/2022-05/msg00341.html
>>
>> but I only get
>>
>> [2]
>> https://lists.gnu.org/archive/html/emacs-devel/2022-05/pngTFsflcCrfU.png
>> The first character does not span the remaining digit characters.
>>
>> Can anyone tell me what I might be missing?
>>
>> 1. 2.txt has code points 0x110BC 0x0967 0x0966 0x096E
>> 2. hb-view --font-file=$HOME/.fonts/NotoSansKaithi-Regular.ttf
>> --text-file=2.txt > 2.png
>>
>> This produces the image in the above mentioned url [2] . I believe it
>> should look like [1].
>>
>> Similar tests for arabic numbers
>> a text file arabic-num.txt with code points 0x0600 0x31 0x32 0x33
>> and a command
>> hb-view --font-file=$HOME/.fonts/NotoSansArabic-Regular.ttf
>> --text-file=arabic-num.txt --output-file=arabic-num.png
>>
>> produces a file where the first character does not span the remaining
>> characters.
>>
>> I believe I used the same font-files as Sameer did:
>>
>> -rw-r--r-- 1 madhu users 260740 Mar 24  2020 NotoSansArabic-Regular.ttf
>> -rw-r--r-- 1 madhu users  87260 Mar 24  2020 NotoSansKaithi-Regular.ttf
>>
>> ---Madhu
>>
>
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