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Reply-To: Brian DOT Inglis AT SystematicSw DOT ab DOT ca
Subject: Re: Cygwin fails to utilize Unicode replacement character
To: cygwin AT cygwin DOT com
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From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
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Date: Tue, 4 Sep 2018 14:40:29 -0600
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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.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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