Arabic text rendering

[salzhrani]

Arabic text rendering

[odrobnik]

Please provide a HTML snippet that demonstrates your issues via pull request.

On Aug 9, 2011, at 1:58 PM, salzhrani wrote:

Amazing work ...

I have noticed a minor issue when rendering Arabic text and it might be a core text issue. when rendering Arabic text it renders perfectly when not accented. if there are accents (َ  ً  ٌ ) it renders OK but some accents break the ligation, specifically this one ( ْ ).

That said you done amazing work and looking forward to the RT component.

Reply to this email directly or view it on GitHub:
https://github.com/Cocoanetics/NSAttributedString-Additions-for-HTML/issues/57

Oliver Drobnik
[email protected]

[salzhrani]

snippet ready, while creating the snippet I found that the problematic accent character is ( ۡ ) (unicode 06E1, UTF8 DBA1) not the one I mentioned earlier

[odrobnik]

Please also describe exactly what the issue is and - if possible - how it would best be resolved. I cannot read Arabic.

[salzhrani]

the issue is that the mentioned character is (I think) treated as a spacing character thus preventing the characters before and after it from being properly ligated. it should be treated as a non-spacing character, thus it would be ignored in terms of ligation.

As you can see the top line, the first word (right most)is broken into 2 pieces (بس م) while in the bottom line it is written as one continuos stroke ( بسم )

to reiterate, the mentioned character ( ۡ ) (unicode 06E1, UTF8 DBA1) is preventing the ligation could be due being treated as a spacing character.

in the html view it is rendered correctly, refer to the following pic

[salzhrani]

Just messed around and changed the font to the system bundled Arabic font "Geeza Pro" and it rendered flawlessly, Could it be font related ?

[odrobnik]

Ligatures are definitely font related because not all fonts support ligatures. Are you saying that this character should simply be omitted on layouting? Or does it have a function? I read something about turning on or of accents...

Sent from my iPad2

Am 10.08.2011 um 03:04 schrieb salzhrani [email protected]:

Just messed around and changed the font to the system bundled Arabic font "Geeza Pro" and it rendered flawlessly, Could it be font related ?

Reply to this email directly or view it on GitHub:
https://github.com/Cocoanetics/NSAttributedString-Additions-for-HTML/issues/57#issuecomment-1768949

[salzhrani]

In Arabic, accents are reading aids that help the reader distinguish heteronyms. Accents should not affect the way the text is rendered and if it is possible to turn it off it might help, especially in some fonts that I tried where all accents break the ligation of the Arabic text.

[odrobnik]

Please suggest or provide a fix for this issue. I have no idea how to deal with this.