Kerning tables in OpenType

Juraj Sukop's picture

Hello,

please, I have a few questions about the kerning tables:

- according to the specification: "OpenType fonts containing CFF outlines are not supported by the 'kern' table and must use the 'GPOS' OpenType Layout table." Does it mean that fonts with "cff " table must not contain "kern" table? I saw fonts which do have both - do they violate the spec? If a "cff " font does not have "GPOS" table but has a "kern" table instead, is it fine to use it anyway?

- if a font has both "kern" and "GPOS" (with kerning info) which table takes precedence? Should the other one be discarded?

- in practice, how frequently are used "kern" tables written in other than "format 0"?

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