Hi
I have developed an Apple Advanced Typography (AAT) font that does Pig
Latin. I have called it Entiumgay, since it is based on the SIL font
Gentium by Victor Gaultney: http://openfontlibrary.org/media/files/j_mach_wust/474
Of course, it is a silly font. I mainly did it as an excercize in
complex AAT. While it works fine in normal Mac OS applications, there
are troubles in XeTeX (of course, it will only run on Mac OS XeTeX
since it is an AAT font). In a document that has only two or three
words, XeTeX will run successfully, but there will be a warning and
some glyphs will overlap. In a document that consists of more words,
it will quit with an error.
I have tried the following document:
\documentclass{article}
\usepackage{fontspec}
\font\piglatin="Entiumgay/AAT"
\begin{document}
\piglatin
hello world hello world hello world
hello world
hello world
hello world
\end{document}
XeTeX will quit with the following error message:
xelatex(1797) malloc: *** error for object 0x1027800: incorrect
checksum for freed object - object was probably modified after being
freed.
*** set a breakpoint in malloc_error_break to debug
xelatex(1797) malloc: *** error for object 0x1027800: pointer being
reallocated was not allocated
*** set a breakpoint in malloc_error_break to debug
** ERROR ** File ended prematurely
Output file removed.
Bus error
I don't know whether I have done something incorrect in the font, or
whether it is just too complex for XeTeX. The font will do multiple
insertions and contextual substitutions on each word. It will append
nine "dummy" glyphs, that is, fake GID numbers that don't point to any
existing glyph in the font. This is an AAT trick, and XeTeX has no
troubles with it in less complicated fonts. The trick is that after
all the AAT rules, no "dummy" glyph must be left. In the pig latin
font, the "dummy" glyphs that are not substituted by pig latin letters
will all be replaced by the .null glyph, that means, they are
essentially deleted again. I have described a simplified, schematical
explanation of the way the AAT works: http://openfontlibrary.org/media/howididit/474
(if you want all the details, you'll have to look at the AAT Morph
Input File that comes with the font release).
--
grüess
mach
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