Fonts that use GPOS contextual positioning/kerning?

Thomas Phinney's picture

(Excuse the cross-post with the OpenType mailing list)

We are compiling a list of fonts for simple writing systems (e.g. Latin, Greek, Cyrillic, etc.) which make at least some use of GPOS contextual positioning. For example, you might be using the relatively new ability of the AFDKO to do contextual kerning, or be doing an equivalent sort of thing using VOLT.

"Contextual kerning" would be kern triplets and the like. For example, You might kern "V." one way but "V.V" differently so the period is neatly between the two V's and the two V's don't collide with each other.

Can anyone who has made such fonts let me know, either here or by email? Note that I'm only interested in fonts that have shipped or will actually ship, that we might encounter in the field.



anagnost's picture


I use contextual GPOS lookups to get Greek combining marks, typed after capital vowels (as the Unicode (de)composition rules requre) properly positioned before them. I. e. a 'mark' anchor point is used to position the mark itself, but the base character, when combined with a mark, should be shifted a bit to right, so that the resulting combination looks more or less the same as the corresponding precomposed character.

See for example my OldStandard font family. Note that the fonts are created with FontForge, which has a very good support for contextual lookups.

Thomas Phinney's picture

In such cases, do the contextual GPOS adjustments act as an override for a non-contextual GPOS adjustment on the same glyph? Or is the contextual GPOS adjustment the only thing that operates on that glyph in that context?

(I'm hoping that question makes sense!)



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