I'm trying to understand how kerning is done in RTL text and can't find
any documentation (on the Internet nor in Freetype) that addresses this.
Questions:
- Do kerning pairs in RTL refer to two sequential glyphs in logical
order or visual order?
- If there is a string with the logical order is CAT and a visual
order of TAC,
do kerning adjusment pairings apply for CA (logical order) or for
AC (visual order)?
- Given that the RTL layout alrogithm
(http://freetype.sourceforge.net/freetype2/docs/glyphs/glyphs-5.html)
specifies that advance width of C (from our CAT above) is applied
before the positioning
and drawing of C, how and when is a kerning adjustment applied?
If I can get this answered, I would like to document this and contribute
the documentation to the Freetype project, as this is something that
appears to have flummoxed a lot of people. Every description of kerning
I can find discusses LTR kerning and unfortunately seems to leave RTL
kerning as an "exercise for the reader".
Thanks.
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