[XeTeX] xetex arabic fonts issue

Abdulrahman Al-Abdusalalm abdulrhman.niz at cas.edu.om
Sun Jun 27 08:58:20 CEST 2010

I can confirm the following behaviour with XeteX:
2 identical *truetype* fonts (one in texmf tree and the other in system
folder) causes problems with rendering.
However, 2 identical *opentype* fonts seems to work fine without any
rendering problems.

Basically, I had the file originally opentype which while fiddling around I
converted to truetype copied it to both texmf tree and system folder
(/usr/share/fonts/ under ubuntu linux) and I got the rendering problem.

Another issue with *truetype* font is that I get isolated letters instead of
the correctly connected ones (this is true also for the Scheherazade font).
I must be missing something when I say?
  \test ......


On 27 June 2010 10:14, Abdulrahman Al-Abdusalalm
<abdulrhman.niz at cas.edu.om>wrote:

> Thanks all for the helpful replies. Previously I had a pfb version under
> after removing it the problem seems to persist. I generated the pfb version
> so I can test
> the font with plain pdfTeX engine. Do I have to remove all the other tfm,
> enc, map files also?
> I will give it a try ...
> Kindest Regards,
> Abdulrahman
> On 27 June 2010 06:58, Jonathan Kew <jfkthame at googlemail.com> wrote:
>> On 26 Jun 2010, at 16:46, Khaled Hosny wrote:
>> > On Sat, Jun 26, 2010 at 03:04:05PM -0700, wodzicki at math.berkeley.eduwrote:
>> >>
>> >>> My guess is that you have an old version of the font installed
>> somewhere.
>> >>> Having to different version of the same font installed is known to
>> cause
>> >>> this kind of issues with xetex, deleting the old version(s) is enough
>> >>> to solve this issue.
>> >>>
>> >>> Regards,
>> >>> Khaled
>> >>
>> >> "an old version" should not be understood literally. Two identical
>> copies
>> >> of the exactly same font: one, say, in the system fonts directory, and
>> >> another one in the TeX distribution tree -- will cause this behavior.
>> I have not seen any evidence that this is so, and would be very surprised
>> if this happens.
>> >> This
>> >> is a very frustrating and well attested bug in XeTeX (which for some
>> >> reason has been ignored so far by the XeTeX creator and maintainer).
>> >
>> > Theoretically, if my previous "analysis" of this issue was correct, two
>> > identical copies should not cause any problems, since both will have
>> > the same glyph IDs. I should have said a different instead of old copy,
>> > though.
>> Indeed. The problem may occur if two *different* versions of the "same"
>> font (i.e., with the same font names, but different versions or different
>> formats -- e.g., type 1 vs truetype) are installed. As I believe I have
>> explained previously, it's possible that xetex will find one font during
>> formatting, but then xdvipdfmx finds the other at PDF generation time, and
>> the glyph IDs don't match.
>> Obviously, it would be better if the two programs were guaranteed to
>> always find the same font for a given name, but ensuring this for all
>> configurations and environments may not be as simple as it sounds. For now,
>> at least, the *strong* recommendation is to have only ONE version of any
>> given font installed.
>> JK
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Abdulrahman AAl Abdulsalam
Assistant Lecturer - IT Department
College of Applied Science
P.O. Box 699
Nizwa, 611
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