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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: |
Sun, 8 Mar 2015 09:20:17 -0700 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Sun, Mar 08, 2015 at 05:51:16PM +0200, Eli Zaretskii wrote:
> > What is actually supported:
> >
> > 0400 - 04FF Everything but 04d8,04d9 (Schwa, used in Cyrillic Azeri —
> > but
> > contemporary Azeri is written in Latin)
> > 0500 - 052F Only 0500 - 0513, 051a - 051d supported
> > 2DE0 - 2DFF None supported (5.1)
> > A640 - A69F None supported (5.1 and later)
>
> FWIW, on one system I use frequently (a pretty standard Windows 7
> machine), the last two blocks are not supported by any font. Likewise
> on another system, an XP with a lot of additional fonts installed.
> But if I install GNU Unifont, then Emacs does use it for these blocks.
> So somehow we do TRT in some situations. Maybe these subranges are
> just a filter?
BTW, using Unifont from unifondry is asking for trouble. And here I
do not mean just your eyes (it may be good at 16pt), but the fact that
it won’t interact with any other font — it claims glyphs for all the
characters in all the ranges — even if it does not know the correct glyph.
My build (“Unifont Smooth” on ilyaz.org/fonts) is properly behaving
(at least in this regard) — and is much better for eyes in all the
resolutions.
> > Does it look like a good indication of anything? I would say no… Do
> > you know any other tool looking at this bitmap for choosing which font
> > to pick up for a particular character?
>
> I guess by "tool" you mean a technique or algorithm that uses the font
> data for selecting the appropriate font? If so, no, I know very
> little in this area, on Windows or elsewhere. Enumerating all the
> glyphs would work, but is probably prohibitively expensive.
Enumerating all the glyphs is exactly how all the tools I know
work — at least those which can show all the characters which can be
shown on a system.
And so far, on Windows I found one such tool (of those not using
fontconfig, like mplayer):
firefox with user’s customizations from
http://search.cpan.org/~ilyaz/UI-KeyboardLayout/lib/UI/KeyboardLayout.pm#There_is_no_way_to_show_Unicode_contents_on_Windows
(Currently, these instructions are not reflecting the fact that
Unifont Smooth became well-behaving, so may be used as a
substitution font too.)
Ilya
- bug#19993: 25.0.50; Unicode fonts defective on Windows, (continued)
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Ilya Zakharevich, 2015/03/13
- 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, 2015/03/06
- 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 <=
- bug#19993: 25.0.50; Unicode fonts defective on Windows, Eli Zaretskii, 2015/03/08