[DejaVu-fonts] Diacritical marks

[Denis J. <mo...@gm...>]

Hi,

I've figured out how to use the Contextual or Chain substitution for
Latin script. So I can add two features:
* 'i' and 'j' being substituted with their dotless components when
followed by a diacritic above.
* substitute the diacritics by upper case size diacritics when
preceded by a capital.

I've also started adding above mark and mkmk so depending on your font
renderer you should be able to stack diacritics on the characters that
have anchors.

I'll need to either shift the uppercase diacritics U+10001-1000C range
and thus all their dependencies, or make reference and add the shifted
ones somewhere  (in the PUA ?). They need to be in the negative on the
X-axis so font renderer don't give them unwanted width.
I was also thinking about adding the contour tone marks. These aren't
defined in Unicode but are generally use in IPA as ligatures of the
different U+02E5-02E9, there are many possible ligature.

About Mono and diacritics, I have no idea what' s the best way to go
about this. Some languages can only form glyphs with composition.
Maybe we could support some precomposition in the PUA? We could use
the Unicode Named Sequences list as a reference:
http://www.unicode.org/Public/UNIDATA/NamedSequences.txt even if it is
missing many glyphs.

Here's a new claim for more diacritics:
0305
0309
030E-030D
0310-0311
0313-0317
031B
031F
0324-0326
0329-0333
0339-033F
0361

For some reason using mkmk was tricky, I don't know it is my patched
Pango or FF that is picky, but mkmk only work on a diacritic if the
base-mark was defined before the mark-mark.

Cheers!
--
Denis Moyogo Jacquerye --- http://home.sus.mcgill.ca/~moyogo