Mac OS X ships with Thonburi as the Thai system font, and that's the
font usually you get for Thai character substitution.
The font substitution system is applying sophisticated algorithm to
closely match font traits, and it appears it's causing the random
fallback.
Probably the system should be smarter to offer more consistent
fallback behavior so that apps are free from such worries. Please
file an enhancement request.
In the meantime, if you want to control the font substitution
behavior, you can create fonts with NSFontDescriptor that has custom
NSFontCascadeListAttribute.
Alternatively, you can post-process the system fallback result by
overriding -[NSTextStorage fixFontAttributeInRange:].
Aki
On 2008/12/03, at 15:41, Gerriet M. Denkmann wrote:
When NSTextView and its friends try to display characters and
encounter a character not present in the current font (e.g. THAI
CHARACTER MO MA in Monaco 10pt.) then they have to get a
corresponding glyph from some other font.
The problem: they sometimes pick up a font which is not suitable.
Is there a way (system wide, per user, per application or using
code) to control the order of fonts being searched for missing glyphs?
In my case Thai characters get displayed in UPC-Angsana (first font
in ~/Library/Fonts), which is a nice font, but rather small (Angsana
10pt. looks rather like 6pt.).
Kind regards,
Gerriet.
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