From: John H. Jenkins (jenkins@apple.com)
Date: Mon Aug 17 2009 - 11:23:29 CDT
¦b Aug 15, 2009 8:24 AM ®É¡A Julian Bradfield ¼g¨ì¡G
> However, there is no way the core font system can ever handle
> variation selectors - it just doesn't have the mechanism. It would
> have to be hacked in at the application library level using PUA
> character positions in the font; which would have to be agreed outwith
> Unicode, implemented in libraries, etc. etc.
The current version of the OpenType spec provides for support of
variation selectors at the font level. It has certainly never been
necessary to support them via PUA character positions in the font.
All the major extensions to TrueType allow for glyphs to be accessed
which don't correspond to any specific charaacter. This is
particularly true for ligatures which is the most straightforward way
to support variation sequences absent the new cmap-level support.
=====
John H. Jenkins
jenkins@apple.com
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