On 8/24/2010 8:17 PM, Gareth Hughes wrote:
The fontspec manual discusses the difference between ICU and AAT font
handling. Macs use the latter, Linux and other operating systems use the
former.
This is true, but remember that OS X can also use Windows-style TrueType
or OpenType fonts with no problem for standard scripts. In 10.4 Apple
added support for OpenType Arabic, but not for Hebrew (as far as I know).
So if you are using, e.g., the SBL Hebrew font (which doesn't come in a
native AAT version) you would need to declare the script in order to
activate the ICU renderer and get support for mark positioning via the
OT features built into the font, whereas you wouldn't do so when working
with a native AAT font.
David
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