[Bug 7150] Implement Arabic shaping

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=7150





--- Comment #18 from Shachar Shemesh <shachar at shemesh.biz>  2009-10-26 17:27:16 ---
(In reply to comment #17)
> > The main problem with this order of doing things is that shaping may change the
> width of the character, which affects the line breaking algorithm.
> 
> yes but it's already broken!

That's because I got it wrong in the comment. The correct order is:
1. Calculate levels
2. Shaping
3. Line break
4. Reorder

http://www.lingnu.com/en/programming/57-bidi-aware-programming-introduction.html
got it right.

> if you like can I make a version to be called on un-ordered text, but you
> should grant me that your ordering function can handle shaped chars like 
> U+FECC ARABIC LETTER AIN MEDIAL FORM

What is special about that particular one?

> so if this is fine with you, please tell me and I'll send you a version of
> BIDI_Shaper that takes unordered argument
> and do you want it to work in line (like current one or should it work on a new
> copy or should it take some buffer to work on ...etc)
> just tell me what do you want.

I "want" wine to implement Uniscribe (
http://msdn.microsoft.com/en-us/library/dd374091(VS.85).aspx ), and implement
BiDi through it. As I don't call the shots on any of this. I just give my
input.

> 
> so please rename BIDI_Shaper into BIDI_Post_Ordering_Shaper and push it.
> and we can add BIDI_Shaper which works before ordering later after you make a
> room for it to be called. what do you think ?

Sorry. If I had time to do that, I'd work on my itches in Wine.

Shachar

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