Peter Constable wrote,
On Mon, Nov 13, 2017 at 12:25 PM, Peter Constable <[email protected]> wrote: > We don't want to add BMP characters to the ExtB fonts. > > > Peter > > -----Original Message----- > From: Unicode [mailto:[email protected]] On Behalf Of James Kass > via Unicode > Sent: Monday, November 13, 2017 11:39 AM > To: Unicode list <[email protected]> > Subject: Re: Plane-2-only string > > A font's sample text can be used in place of the default "The quick brown > fox..." text which is used to illustrate the typeface in applications which > support that feature. > > One approach would be to find a non-gibberish text string using some Plane 2 > characters and add the BMP glyphs to the font mapped to the BMP PUA. Because > if only a handful of BMP CJK glyphs were added to the font mapped to their > standard code points, the font might need to claim to support BMP CJK (when > in fact it does not) in order to display the sample text. Or, (if standard > code points are used) the font might be auto-detected as supporting BMP CJK > by some applications, when it doesn't really support that range. > > On Mon, Nov 13, 2017 at 10:20 AM, Peter Constable via Unicode > <[email protected]> wrote: >> I’m wondering if anyone could come up with a string of 15 to 40 characters >> _using only plane 2 characters_ that wouldn’t be gibberish? >> >> We are considering adding sample-text strings in some of our fonts. (In >> OpenType, the ‘name’ table can take sample-text strings using name ID 19.) >> One particular issue we have is the Simsun-ExtB and MingLiU-ExtB fonts, >> which have CJK characters from plane 2 only. >> >> Background: >> The Simsun-ExtB and MingLiU-ExtB fonts are meant to complement the Simsun >> and MingLiU fonts: the combined glyph count exceeds the number of glyphs >> that can be added in a single OpenType font, and so the “ExtB” fonts are >> used to contain all of the Plane 2 characters that are supported. For >> example, the Simsun font supports 28738 BMP characters, and no plane 2 >> characters, while Simsun-ExtB supports the Basic Latin block from the BMP >> plus 47,293 plane 2 characters. The combined glyph count exceeds 64K, so >> can’t go into a single font. >> >> >> >> Peter >
