|Subject:||[ft] What do kerning values mean in RTL text?|
|Date:||Fri, 09 Jun 2006 12:14:43 -0700|
|User-agent:||Mozilla Thunderbird 1.0.7 (Windows/20050923)|
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 adjustment 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 and in what way 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".
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