Re: Cygwin fails to utilize Unicode replacement character

[Corinna Vinschen <corinna-cygwin@cygwin.com>]

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On Sep  4 14:40, Brian Inglis wrote:
> On 2018-09-04 12:20, Steven Penny wrote:
> > On Tue, 4 Sep 2018 16:18:21, Thomas Wolff wrote:
> >> My vote is against the patch because the nodef glyph will often be just blank
> >> space which is certainly worse than ▒.
> 
> Not according to the sample below: you would have to know that medium shade
> means unavailable.
> 
> >> If conhost does not provide a reasonable way to enquire 0xFFFD availability
> >> it's conhost's fault, not cygwin's so why should cygwin implement a bad
> >> compromise. If conhost ever improves, cygwin can adapt.
> > This is some dangerous commentary. I would like to counter it now with some
> > actual research. Using BabelMap:
> > http://babelstone.co.uk/Software/BabelMap.html
> > You can do "Fonts", "Font Coverage" and you will get this result with code point
> > FFFD:
> >    yes: DejaVu Sans Mono
> >    no:
> >    - Consolas
> >    - Courier New
> >    - Lucida Console
> >    - MS Gothic
> >    - NSimSun
> >    - SimSun-ExtB
> > This is concerning true, but we can then review the ".notdef glyph" for the
> > problem fonts. As this glyph is not an actual character, i cant paste it here,
> > but i will describe them below:
> >    empty rectangle:
> >    - Courier New
> >    - Lucida Console
> >    - MS Gothic
> >    - SimSun-ExtB
> >    rectangle with a question mark inside: Consolas
> 
> These are both recommended .notdef glyphs.
> 
> >    none: NSimSun
> 
> Valid OTF and TTF fonts must have a glyph with index entry 0 used for .notdef.

Discussion closed for 2.11.1.  I'm going to release it as is, with
0xfffd as replacement char.

A better/more complex solution will have to go into the next release.


Thanks,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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