Re: Font support of UTF-8 chars differ between w32 Emacs and Cygwin Emacs

[Ken Brown <kbrown at cornell dot edu>]

On 9/3/2014 8:41 AM, Sebastien Vauban wrote:
> Hello,
>
> As you can see on http://screencast.com/t/XTTv9DSAC, win32 binaries of
> Emacs and Cygwin Emacs can't display the white right-pointing
> triangle [1] coherently for the same fonts:
>
> - win32 Emacs always can display it, in all fonts,
>
> - Cygwin Emacs can't display it with Consolas, Courier New and Lucida
>    (among others).
>
> MWE:
>
> --8<---------------cut here---------------start------------->8---
> ;; these fonts only display (special?) UTF-8 chars (here: the white
> ;; right-pointing triangle) in win32 binary of Emacs
>
> (modify-all-frames-parameters '((font . "Consolas-10")))
> (char-displayable-p ?\u25B7)
>
> (modify-all-frames-parameters '((font . "Courier New-9")))
> (char-displayable-p ?\u25B7)
>
> (modify-all-frames-parameters '((font . "Lucida Console-9")))
> (char-displayable-p ?\u25B7)
>
> ;; these work for both win32 binary of Emacs + Cygwin Emacs
>
> (modify-all-frames-parameters '((font . "DejaVu Sans Mono-9")))
> (char-displayable-p ?\u25B7)
>
> (modify-all-frames-parameters '((font . "Lucida Sans Typewriter-9")))
> (char-displayable-p ?\u25B7)
> --8<---------------cut here---------------end--------------->8---
>
> Any idea why such differences?
>
> Best regards,
>    Seb
>
> [1] http://www.scarfboy.com/coding/unicode-tool?s=U%2B25B7

I've had a chance to look at this now, and it doesn't seem to have 
anything to do with emacs.

I've created a text file 25b7.txt (attached) with a single line 
containing the white right-pointing-triangle.  When I issue the command 
"cat 25b7.txt" in a mintty terminal, I sometimes see an empty rectangle 
(meaning the character can't be displayed), and I sometimes see the 
white right-pointing triangle, depending on which font I select in the 
mintty options.

I don't know enough about fonts and UTF-8 encoding to be able to shed 
any more light on this.  Maybe someone else can help.

Ken

Attachment: 25b7.txt
Description: Text document

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