[HarfBuzz] kaithi & arabic : glyphs that span number

[Behdad Esfahbod]

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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