We don't want to add BMP characters to the ExtB fonts.
Peter -----Original Message----- From: Unicode [mailto:unicode-boun...@unicode.org] On Behalf Of James Kass via Unicode Sent: Monday, November 13, 2017 11:39 AM To: Unicode list <unicode@unicode.org> 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 <unicode@unicode.org> 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
