Around 20 o'clock on Jun 29, Pablo Saratxaga wrote:

> A font is suited for a given language when it covers *ALL* of the codepoints
> needed for that language.

Yes, that's obviously true, but the problem is that I don't have tables for
each language indicating the required codepoints, all I have are tables
listing Unicode values in encodings traditionally used for each language.
These tables almost always include a few (1-5) glyphs which many fonts are
missing.

So, the test is to require that the number of missing glyphs for non-Han 
languages is very small (<8) to allow fonts which happen to be missing 
only a few unimportant glyphs to be used.  Discovering which glyphs in 
each encoding are problematic in many fonts would allow this fudge factor 
to be reduced further.

> So, the tests for CJK languages and for other languages are clearly different,
> only CJK languages can go with testing only a "signifiant fraction",
> for all other languages all chars must be tested.

Yes, the tolerance value given for the Han languages is 500 codepoints 
while the value for non-Han languages is two orders of magnitude smaller.

Keith Packard        XFree86 Core Team        HP Cambridge Research Lab


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