[HarfBuzz] order of glyphs presented to font features.

[Ebrahim Byagowi]

Interesting, I see the difference also,

./hb-view UthmanicHafs1\ Ver09.otf --direction=ltr ١٢

           ▁▁▅▅▄▁

        ▂▃▊▂▃  ▂▇ ▃▂

     ▁▖▅▃▖▉▅    ▗▖ ▃▆▟▖

    ▗▟ ▆▂ ▙▗▃▙▙▄▃▟ ▂▆ ▙▚

   ▗▟▖▙▆            ▇▅▗▁▙

    ▄     ▗  ▖         ▙ ▏

  ▊        ▅▅▟          ▋▌

  ▋▍      ▙             ▉

  ▉        ▙▍           ▋▌

    ▚       ▟     ▙    ▃

   ▙▖▅▟▃▁          ▁▃▖▅▗▟

    ▙▄ ▗▂ ▚▅▆▚▞▅▆▌ ▂▃ ▗▟

      ▄▗▁▅▙▄▁ ▚▁▅▟▄▆▃▙▇

        ▇▅  ▆  ▇▅ ▄▇

            ▇▆▆▆

and


./hb-view /Library/Fonts/Tahoma.ttf --direction=ltr ١٢

          ▖          ▙    ▂▁     ▁▃

           ▖          ▙

                            ▄▄ ▄▄▅▆▇

         ▙                  ▖

          ▋  ▍               ▖

          ▉

                           ▋  ▎

                           ▊  ▍

                           ▊  ▍

                           ▊  ▍

             ▋             ▊  ▍


on harfbuzz master, wanted to say font bug but I see CoreText is also deals
with this better:

[image: Inline image 1]

data:text/html;charset=utf8,<div style="font-family: 'KFGQPC Uthmanic
Script HAFS'; font-size: 900%">١٢

On Sat, Jun 24, 2017 at 1:07 AM, Eric Muller <emuller at amazon.com> wrote:

> It seems that when:
>
> hb_buffer_set_script (fBuffer, HB_SCRIPT_ARABIC);
> hb_buffer_set_direction (fBuffer, HB_DIRECTION_LTR);
> hb_buffer_add_utf32 (fBuffer, "&#x0661;&#x0662;");   // pseudo code, of
> course
>
> then the glyphs are presented in the wrong order to the font features. You
> can see this with the font available at <http://fonts.qurancomplex.gov
> .sa/?page_id=42>. It's intended for the Quran (and only for the Quran;
> word doc at the same URL), and ligates sequences of digits for the end of
> ayah. The example above displays "end of ayah 21".
>
> I am using a slightly old version of Harfbuzz, so may be this has been
> fixed?
>
> Thanks,
> Eric.
>
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> HarfBuzz at lists.freedesktop.org
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