[XeTeX] unicode-math testing

[wodzicki at math.berkeley.edu]

>> > I have had problems like this as well, a while ago, but simply with
>> > fontspec. I had one of Adobe's fonts in both my windows fonts
>> > directory and in the TeX tree (same version btw) and my documents came
>> > out all garbled. Removing the one in windows\fonts fixed it.
>> >
>> > Should XeTeX just stick with whichever of the fonts it finds first?
>>
>> I'm not sure, but it may be that the font file used by xetex is not the
>> one xdvipdfmx is graping glyphs from, I don't know how xetex passes the
>> font to the xdv file, but may there are two separate font lookup
>> routines and each one is returning a different font file? Checking the
>> source code might help, but I don't feel like doing it.
>
> Looking further, it seems that when a system font is used, xetex embeds
> the font name not the resolved path in the xdv file, so xdvipdfmx has to
> lookup the font again and it seems to find a different font sometimes. I
> don't know why xetex don't just embed the resolved full path of the
> font, as it does already with with "external fonts", this makes sure
> xdvipdfmx is getting the same font file as xetex and alleviate the need
> of font lookup logic in xdvipdfmx itself. May be there is some
> (historical?) reason, but judging by how popular this issue, I think it
> might be reasonable to consider this.
>
> Regards,
>  Khaled

Khaled seems to have pinpointed the common source of all of these troubles
with garbled PDF files. I hope that now somebody contacts Jonathan Kew
about it.

Mariusz Wodzicki