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bug#19993: 25.0.50; Unicode fonts defective on Windows
From: |
Ilya Zakharevich |
Subject: |
bug#19993: 25.0.50; Unicode fonts defective on Windows |
Date: |
Fri, 6 Mar 2015 14:08:01 -0800 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Fri, Mar 06, 2015 at 10:11:32PM +0200, Eli Zaretskii wrote:
> > Date: Fri, 6 Mar 2015 08:21:36 -0800
> > From: Ilya Zakharevich <ilya@math.berkeley.edu>
> > Cc: 19993@debbugs.gnu.org
> >
> > On Fri, Mar 06, 2015 at 04:00:27PM +0200, Eli Zaretskii wrote:
> > > > Practically nothing “non-banal” is shown. Let me try… No U+1D49C,
> > > > U+2099 ₙ, U+1D552, U+27e8 U+27e9 ⟨⟩ (just looking into my recent
> > > > “real-life” file of notices).
> > >
> > > U+2099, U+27e8, and U+27e9 are displayed here (I have the STIX fonts
> > > installed, and they are used for that). The rest indeed aren't.
> >
> > > Do you have fonts installed that cover these codepoints?
> >
> > As I said, «Unifont Smooth» has everything in BMP of v7.0. Many fonts
> > (including «Symbola») have Math chars.
>
> Emacs on Windows needs a font to support the entire range of a script,
> or else it won't use the font. It finds out which scripts are
> supported by a font by looking at the fsUsb member of the
> FONTSIGNATURE structure for each font. See font_supported_scripts,
> and also font_matches_spec which uses it, for the details. So maybe
> the fonts you have don't announce in their signature that they support
> these Unicode ranges. E.g., U+1D49C is in "Mathematical ALphanumeric
> Symbols", whose subrange bit is 89 -- does Symbola set this bit in its
> font signature?
This does not make any sense… Before we go to the details of a font
structure, let’s discuss it semantically.
What can it mean that a font “supports a script”?
Theoretically, it may mean that
• it “knows” all the characters in the script, and
• has enough extra infrastructure to shape these characters
into a correct glyphic representation.
I may see that the second part may be described by one bit per
script. But what about the first one? A repertoir of a script
changes every year (sometimes several times per year). How can this
be encapsulated into a bit?
-------
But anyway:
• I open Symbola.ttf with fontforge;
• Go to Element⫽Font␣Info;
• Go to OS/2;
• Go to Charsets;
• And there, deep in the list, “Mathematical Alphanumeric Symbols”
are highlighted.
AND: Symbola IS listed in `font-show-log'…
> Or maybe we could add some more heuristics to the code in w32font.c,
> to be smarter about font selection for Symbol script. I really don't
> know enough about all this stuff.
I’m not sure one can fix this mess incrementally….
Ilya
- bug#19993: 25.0.50; Unicode fonts defective on Windows, (continued)
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Ilya Zakharevich, 2015/03/11
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Eli Zaretskii, 2015/03/11
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Eli Zaretskii, 2015/03/12
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Ilya Zakharevich, 2015/03/12
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Eli Zaretskii, 2015/03/13
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Ilya Zakharevich, 2015/03/13
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Eli Zaretskii, 2015/03/13
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Eli Zaretskii, 2015/03/08
- bug#19993: 25.0.50; Unicode fonts defective on Windows,
Ilya Zakharevich <=
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Eli Zaretskii, 2015/03/07
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Ilya Zakharevich, 2015/03/08
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Eli Zaretskii, 2015/03/08
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Ilya Zakharevich, 2015/03/08
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Eli Zaretskii, 2015/03/08