Well, first off, ATSUI, and MLTE which uses ATSUI, does not support
the OpenType Arabic shaping engine (it would have been great to get
into ATSUI for Leopard but... as I explained at the last WWDC, ATSUI
is actually a very old technology that is getting very difficult to
shim new technology into so we are strongly advocating developers use
Cocoa and/or CoreText moving forward). The TextEdit app as you noted
does do OpenType Arabic shaping which is done solely through
CoreText. So really CoreText is the ticket here and can be used in a
Carbon or Cocoa app (it has toll free bridgeable objects with NS). It
also will retrieve the glyph outlines which was a developer request at
WWDC '07 that allowed more apps to switch from ATSUI.
So I surprised your layout is not working with CoreText. Could you
please send me some example code and the font that you are relying
upon? It should definitely work if it works in TextEdit and I've
tested very complicated Arabic OpenType fonts using CoreText with
positive results.
Dan Fenwick
On Nov 1, 2007, at 5:58 AM, Jerry wrote:
We have customers who are using OpenType Arabic fonts, but find that
the contextual form substitution does not happen on the Mac. This is
because OS X didn't support the OpenType tables which do the
substitution. When I asked about this on this lists previously, I
was told that full support would be in Leopard. Well, Leopard has
arrived, and the customers are complaining already. It seems that
these fonts now work correctly in TextEdit, but nowhere else. I've
tried using them in MLTE, ATSUI code and Core Text code and have
been unable to get contextual forms to work. I've also tried using
ftxanalyzer/ftxenhancer to create 'morx' tables for the fonts with
no success. I've tried turning on every typographical feature I can
think of in ATSUI to no effect.
Does anyone have any ideas on this? Since the fonts now work
correctly in Leopard's TextEdit, OS X can do it, but how do I draw
Arabic text in my Carbon application with contextual form
substitution? (Creating an offscreen NSTextView is not an option as
we need to do our own font rendering using glyph outlines, currently
obtained from ATSUI).
Jerry
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