On Sun, 18 Feb 2018 13:05:29 +0100 Adam Borowski via Unicode <[email protected]> wrote:
> On Sun, Feb 18, 2018 at 02:14:46AM -0800, James Kass wrote: > > You probably already know that basic script coverage information is > > stored internally in OpenType fonts in the OS/2 table. > > > > https://docs.microsoft.com/en-us/typography/opentype/spec/os2 > > It's only a single bit without a meaning beyond "range is considered > functional". No "basic coverage" vs "good coverage" vs "full > coverage". It's worse than that when a script uses characters primarily associated with another script. For example, to have any confidence that my Tai Tham font will be used for U+0E4A THAI CHARACTER MAI TRI or U+0E4B THAI CHARACTER MAI CHATTAWA placed on U+1A4B TAI THAM LETTER A, I have to set the Thai bit, even though I only have four Thai characters in my font. (The other two are punctuation.) Richard.
