[XeTeX] LetterSpace and line breaking

[Zdenek Wagner]

2013/5/15 Vadim Radionov <vadim.radionov at gmail.com>:
> According to \tracingparagraphs' output, the first line is tight (1.3), with
> badness b=35, while it is in fact overfull and should have b=*.  My numbers
> are slightly differen (probably, DejaVu fonts are not identical?) and

DejaVu fonts are not identical, it depends on version. I remember that
I processed exactly the same document on my Fedora Core 2 (many years
ago) and there was one page difference in comparison toprocessing it
on a Mac. Finally my PDF was used in production because at that time
there was a mac specific bug in XeTeX (loading images, but it was
fixed years ago). One version of DejaVu fonts lacks fi and fl
ligatures. The glyphs are nice, I like the font, but be prepared that
the developers do not care to keep the metrics.

> \tracingparagraphs gives even decent line  (1.2) with badness b=9 instead of
> overfull!
>
> @secondpass
> []\EU1/DejaVuSerif(0)/m/n/10 3. \EU1/DejaVuSerif(1)/m/n/10 По-вест-во-
> ва-ние  \EU1/DejaVuSerif(0)/m/n/10 со-сто-ит из опи-са-ния
>  ис-
> @\discretionary via @@0 b=9 p=50 d=2861
> @@1: line 1.2- t=2861 -> @@0
>
>
>
> On Wed, May 15, 2013 at 1:22 PM, Zdenek Wagner <zdenek.wagner at gmail.com>
> wrote:
>>
>> 2013/5/14 Vadim Radionov <vadim.radionov at gmail.com>:
>> > Dear list memers,
>> >
>> > I encountered a problem: setting LetterSpace parameter somehow breaks
>> > line
>> > breaking mechanism. Consider the following example (in Russian); the 1st
>> > variant without \mbox has obvious break point missed. (I'm aware  that
>> > letter spacing is strongly discouraged in English texts, suppose that I
>> > have
>> > to reproduce some ancient design as close as possible.)
>> >
>> The break point is not missed but for some reason its usage leads to a
>> paragraph that is considered worse. If I set \tracingparagraphs=1, I
>> get:
>>
>> @firstpass
>> []\EU1/DejaVuSerif(0)/m/n/10 3. \EU1/DejaVuSerif(1)/m/n/10 Повествование
>> \EU1/
>> DejaVuSerif(0)/m/n/10 состоит из описания
>> @ via @@0 b=3 p=0 d=169
>> @@1: line 1.2 t=169 -> @@0
>> @secondpass
>> []\EU1/DejaVuSerif(0)/m/n/10 3. \EU1/DejaVuSerif(1)/m/n/10
>> По-вест-во-ва-ние  \
>> EU1/DejaVuSerif(0)/m/n/10 со-сто-ит из опи-са-ния ис-
>> @\discretionary via @@0 b=35 p=50 d=4525
>> @@1: line 1.3- t=4525 -> @@0
>> то-рии пред-ме-та по су-ще-ству, т. е. как воз-ник во-
>> @\discretionary via @@1 b=50 p=50 d=26100
>> @@2: line 2.1- t=30625 -> @@1
>> прос, ко-то-рый под-ле-жит раз-ре-ше-нию, и как сло-
>> @\discretionary via @@2 b=83 p=50 d=21149
>> @@3: line 3.1- t=51774 -> @@2
>> жи-лось са-мо де-ло.
>> @\par via @@3 b=0 p=-10000 d=5100
>> @@4: line 4.2- t=56874 -> @@3
>>
>>
>> Overfull \hbox (14.1539pt too wide) in paragraph at lines 17--20
>> []\EU1/DejaVuSerif(0)/m/n/10 3. \EU1/DejaVuSerif(1)/m/n/10 Повествование
>> \EU1/
>> DejaVuSerif(0)/m/n/10 состоит из описания ис-
>>  []
>>
>> .................................................
>> . fontspec info: "defining-font"
>> .
>> . Font family 'DejaVuSerif(1)' created for font 'DejaVu Serif' with
>> options
>> . [Mapping=tex-text,Script=Cyrillic,LetterSpace=40].
>> .
>> . This font family consists of the following shapes:
>> .................................................
>> @firstpass
>> []\EU1/DejaVuSerif(0)/m/n/10 3. []  состоит из описания
>> @ via @@0 b=3 p=0 d=169
>> @@1: line 1.2 t=169 -> @@0
>> @secondpass
>> []\EU1/DejaVuSerif(0)/m/n/10 3. []  со-сто-ит из опи-са-ния
>> @ via @@0 b=3 p=0 d=169
>> @@1: line 1.2 t=169 -> @@0
>> ис-то-рии пред-ме-та по су-ще-ству, т. е. как воз-ник во-
>> @\discretionary via @@1 b=2 p=50 d=2644
>> @@2: line 2.2- t=2813 -> @@1
>> прос, ко-то-рый под-ле-жит раз-ре-ше-нию, и как сло-
>> @\discretionary via @@2 b=83 p=50 d=21149
>> @@3: line 3.1- t=23962 -> @@2
>> жи-лось са-мо де-ло.
>> @\par via @@3 b=0 p=-10000 d=5100
>> @@4: line 4.2- t=29062 -> @@3
>>
>> I am not able to explain the difference. I get the same result in TL
>> 2012 and  2013 pretest, the only difference s that TL 2012 does not
>> display cyrillic in the log thus it is almost unreadable.
>>
>> > What kind of bug is it?
>> >
>> > Thank you in advance,
>> > Vadim
>> >
>> > \documentclass{book}
>> > \usepackage{geometry}
>> > \geometry{width=9.5cm}
>> >
>> > \usepackage[no-sscript]{xltxtra}
>> > \usepackage{polyglossia}
>> >
>> > \setdefaultlanguage{russian}
>> > \newfontfamily\russianfont[Mapping=tex-text,Script=Cyrillic]{DejaVu
>> > Serif} %
>> > {PT Serif}
>> >
>> > \emergencystretch4em
>> >
>> > \begin{document}
>> >
>> > 3. {\addfontfeature{LetterSpace=40} Повествование} \ состоит из описания
>> > истории предмета по
>> > существу, т. е. как возник вопрос, который подлежит разрешению,
>> > и как сложилось само дело.
>> >
>> > 3. \mbox{\addfontfeature{LetterSpace=40} Повествование} \ состоит из
>> > описания истории предмета по
>> > существу, т. е. как возник вопрос, который подлежит разрешению,
>> > и как сложилось само дело.
>> >
>> > \end{document}
>> >
>> >
>> >
>> >
>> >
>> >
>> >
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>>
>>
>>
>> --
>> Zdeněk Wagner
>> http://hroch486.icpf.cas.cz/wagner/
>> http://icebearsoft.euweb.cz
>>
>>
>>
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--
Zdeněk Wagner
http://hroch486.icpf.cas.cz/wagner/
http://icebearsoft.euweb.cz