Thanks for your reply,
I'm cc'ing Jonathan Kew, as I'm not sure I can really comment precisely
on the current patch. At the moment the "missing glyph for this unicode
char" is done at a low level, during the text rendering. My
understanding is that you can determine a script (e.g. Cyrillic) for a
given character, but you have no way to then infer the language (e.g.
the various languages using the Cyrillic alphabet). HTML has a lang
attribute that could be used to determine the language of a page, but
this is done at a higher level in Gecko and this attribute might not
always be provided anyway. So I believe, it is unlikely that Gecko will
always be able to provide both the language and script tags. On the
other hand, I believe that fontconfig would be able to determine the
script(s) used in a font by checking the unicode coverage, just as
Jonathan has done that in Gecko.
(Anyway, in the short term it's unlikely that the script metadata is
available in PackageKit, so Mozilla will need a way to map the script
tag to something that this library can understand. My plan is to have an
add-on that does that)
Regarding the Zmth "Mathematical notation" script, perhaps a more
reliable way for fontconfig would be to check the presence of the
OpenType MATH table [1]. Indeed, some fonts like DejaVu have good
coverage for math characters, but can not really be used for math
rendering because of the absence of the MATH table, so only checking the
unicode coverage is not enough...
[1]
http://mpeg.chiariglione.org/standards/mpeg-4/open-font-format/text-isoiec-cd-14496-22-3rd-edition,
section 6.3.6
Le 30/04/2014 13:11, Akira TAGOH a écrit :
I have a rough idea to support the script based selection in
fontconfig though, there are some issues we may need to address before
that. most obvious one is, the mapping from the script to fonts isn't
necessarily unique.that may eventually depends on the language or
needing another map to determine the script tag at the end as you
told. easier way may be to leave it to applications and expect to see
the language and the script tags together in the query perhaps. no ETA
for that however.
On Wed, Apr 30, 2014 at 4:45 PM, Frédéric WANG <fred.wang@xxxxxxx> wrote:
Dear FontConfig & PackageKit developers,
I've recently worked on automatic font installation in Gecko-based
applications using PackageKit [1]. The current patch to add notifications
for missing glyphs in Gecko relies on script tags as defined in iso15924 [2]
[3]. So it would help if fontconfig & PackageKit would be able to handle
some metadata for these script tags, for example :script=Khmr (at the moment
I think only the :lang tag is supported). Also, I'm interested in automatic
installation of math fonts, so it would be important to support the code
"Zmth=Mathematical notation" too. This script does not correspond to any
Unicode script, but you can find some relevant ranges in
http://www.w3.org/TR/xml-entity-names/#blocks (especially the Mathematical
Alphanumeric Symbols are important and are required for [4])
Thanks,
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=467729
[2] http://www.unicode.org/iso15924/iso15924-codes.html
[3] https://bugzilla.mozilla.org/show_bug.cgi?id=619521
[4] https://bugzilla.mozilla.org/show_bug.cgi?id=930504
--
Frédéric Wang
MathML Crowdfunding: ulule.com/mathematics-ebooks
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--
Frédéric Wang
MathML Crowdfunding: ulule.com/mathematics-ebooks
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