bug#22609: 24.5; Different Font display for windows32 implementation

bug#22609: 24.5; Different Font display for windows32 implementation

[Matthew Fidler]

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Under windows32 individual glyphs from a font are not displayed in the mode
line (or the header-line).

How to reproduce:

Download github-octicons (https://octicons.github.com/)

Evaluate the following

(defvar mode-icons-octicons-font
  (find-font (font-spec :name "github-octicons")))

(setq test (propertize "test" 'display (make-string 1 #xf0c9) 'font
'mode-icons-octicons-font))

(setq header-line-format test
 mode-name test)
(force-mode-line-update)

The header-line and footer-line should have a markdown-symbol in it.  On
Cygwin and linux, these show the markdown symbol.  On windows 32 emacs, it
shows a missing glyph.

I wanted to add this to mode-icons:

https://github.com/ryuslash/mode-icons/issues/4

Matt




In GNU Emacs 24.5.1 (i686-pc-mingw32)
 of 2015-04-11 on LEG570
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --prefix=/c/usr --host=i686-pc-mingw32'

Important settings:
  value of $EMACSDATA:
C:\tmp\EmacsPortable.App\App\eps\..\emacs-24.5\share\emacs\24.5\etc
  value of $EMACSDOC:
C:\tmp\EmacsPortable.App\App\eps\..\emacs-24.5\share\emacs\24.5\etc
  value of $EMACSLOADPATH:
C:\tmp\EmacsPortable.App\App\eps\..\site-lisp;C:\tmp\EmacsPortable.App\App\eps\..\emacs-24.5\share\emacs\24.5\lisp
  value of $LANG: ENU
  locale-coding-system: cp1252

Major mode: EsN

Minor modes in effect:
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  anzu-mode: t
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  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
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Recent messages:
Mark saved where search started
Mark set [2 times]
Saving file m:/Work/0165/Model/pataday-vs-pazeo/nonmem/mod138.mod...
spot 1 [22 times]
Found Option file [2 times]
Finished automatically updating portions of the file (headers etc...)
Wrote m:/Work/0165/Model/pataday-vs-pazeo/nonmem/mod138.mod
[EsN] esn-extended loaded in 682.604000 seconds, 13839.459000 seconds
elapsed since initial load
Found Option FILE [2 times]
Error running timer `keyfreq-autosave--do': (end-of-file)

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bug#22609: 24.5; Different Font display for windows32 implementation

[Andy Moreton]

On Tue 09 Feb 2016, Matthew Fidler wrote:

> Under windows32 individual glyphs from a font are not displayed in the mode
> line (or the header-line).
>
> How to reproduce:
>
> Download github-octicons (https://octicons.github.com/)
>
> Evaluate the following
>
> (defvar mode-icons-octicons-font
>   (find-font (font-spec :name "github-octicons")))
>
> (setq test (propertize "test" 'display (make-string 1 #xf0c9) 'font
> 'mode-icons-octicons-font))

That codepoint is in the private-use area of Unicode, so I woud not
expct it to work (however I am far from expert in this area). You may need to
add the font to a fontset for the needed range of codepoints.

For example, adding this to default fontset shows the desired character
in the header line:

(set-fontset-font t '(#xf000 . #xf0e7) (font-spec :name "github-octicons"))

    AndyM

bug#22609: Code points

[Matthew Fidler]

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You're right it's a private code base.   I'm assuming if I run that code,
it remaps everywhere.   If would like to use github fonts and font awesome
fonts and they share the same character then I would have to choose one
glyph. Is that correct?

However, on Linux/Cygwin such mapping is not necessary.  All that is
necessary is to declare the font.

Matt

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bug#22609: 24.5; Different Font display for windows32 implementation

[Eli Zaretskii]

> From: Matthew Fidler <matthew.fidler@gmail.com>
> Date: Tue, 09 Feb 2016 20:29:52 +0000
> 
> Download github-octicons (https://octicons.github.com/)
> 
> Evaluate the following
> 
> (defvar mode-icons-octicons-font
>   (find-font (font-spec :name "github-octicons")))
> 
> (setq test (propertize "test" 'display (make-string 1 #xf0c9) 'font 'mode-icons-octicons-font))
> 
> (setq header-line-format test
>  mode-name test)
> (force-mode-line-update)
>
> The header-line and footer-line should have a markdown-symbol in it.  On Cygwin and linux, these show the markdown symbol.  On windows 32 emacs, it shows a missing glyph.

This font uses codepoints in the Private Use Area (PUA) block of
Unicode, but it doesn't declare coverage of that block (or any block,
really) in its headers.  Emacs on Windows requires that a font
declares support for a block before it will consider it for displaying
characters in that block.  It also doesn't like fonts that don't
support any Unicode block at all, which is what this font does.

If the font declared coverage of PUA, it could have made sense to try
introducing the notion of PUA pseudo-script into Emacs (something we
don't have today), and then use such a font for characters in PUA
blocks.  But since the font doesn't declare any coverage, doing that
won't help.

> You're right it's a private code base.   I'm assuming if I run that code, it remaps everywhere.   If would like to use github fonts and font awesome fonts and they share the same character then I would have to choose one glyph. Is that correct?  

Yes, that's correct.  Fonts that use PUA blocks are problematic
because when they use the same codepoint for different glyphs, Emacs
will select one of them at random, unless you tell it which one to
select by customizing your fontset.  And that only works well if you
don't need both glyphs in some situation.

So I think that, in general, when you want to use such a font, you
must do what Andy suggested, because Emacs is clueless: these
codepoints don't tell to which character set or script they belong,
they don't tell anything about their properties, etc.  Emacs needs
help.  You can make that setting part of your mode, and it will work
on all systems.

> However, on Linux/Cygwin such mapping is not necessary.  All that is necessary is to declare the font.

I think that's sheer luck, and will likely stop working once you have
more than one font that covers the same codepoints.

Btw, I don't really understand why you need this in Emacs.  I'm
guessing that you do it because you actually want to display some icon
on the mode line.  But Emacs can display images on the mode line
without any PUA fonts: just create image files out of those glyphs,
and use them directly.  Emacs doesn't need such "poor man's images".
That should fix your problems, I think.

Thanks.

bug#22609: 24.5; Different Font display for windows32 implementation

[Eli Zaretskii]

> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Wed, 10 Feb 2016 00:00:34 +0000
> 
> That codepoint is in the private-use area of Unicode, so I woud not
> expct it to work (however I am far from expert in this area).

As I wrote elsewhere, this is true.  That font does quite a few things
Emacs doesn't like.

> You may need to add the font to a fontset for the needed range of
> codepoints.
> 
> For example, adding this to default fontset shows the desired character
> in the header line:
> 
> (set-fontset-font t '(#xf000 . #xf0e7) (font-spec :name "github-octicons"))

Yes, this is the solution in such cases.

Thanks.

bug#22609: 24.5; Different Font display for windows32 implementation

[Matthew Fidler]

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I thought that I declared what font to use by declaring the 'font property,
so it would not be ambiguous to emacs what font to display the glyph with.

As a test, I decided to try webdings as a font.  As you said, emacs doesn't
allow display of the "a" character in both webdings (a checkbox) and
whatever font I'm using.

I guess that cygwin may have done the display by luck.

Matt

On Wed, Feb 10, 2016 at 11:44 AM Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Matthew Fidler <matthew.fidler@gmail.com>
> > Date: Tue, 09 Feb 2016 20:29:52 +0000
> >
> > Download github-octicons (https://octicons.github.com/)
> >
> > Evaluate the following
> >
> > (defvar mode-icons-octicons-font
> >   (find-font (font-spec :name "github-octicons")))
> >
> > (setq test (propertize "test" 'display (make-string 1 #xf0c9) 'font
> 'mode-icons-octicons-font))
> >
> > (setq header-line-format test
> >  mode-name test)
> > (force-mode-line-update)
> >
> > The header-line and footer-line should have a markdown-symbol in it.  On
> Cygwin and linux, these show the markdown symbol.  On windows 32 emacs, it
> shows a missing glyph.
>
> This font uses codepoints in the Private Use Area (PUA) block of
> Unicode, but it doesn't declare coverage of that block (or any block,
> really) in its headers.  Emacs on Windows requires that a font
> declares support for a block before it will consider it for displaying
> characters in that block.  It also doesn't like fonts that don't
> support any Unicode block at all, which is what this font does.
>
> If the font declared coverage of PUA, it could have made sense to try
> introducing the notion of PUA pseudo-script into Emacs (something we
> don't have today), and then use such a font for characters in PUA
> blocks.  But since the font doesn't declare any coverage, doing that
> won't help.
>
> > You're right it's a private code base.   I'm assuming if I run that
> code, it remaps everywhere.   If would like to use github fonts and font
> awesome fonts and they share the same character then I would have to choose
> one glyph. Is that correct?
>
> Yes, that's correct.  Fonts that use PUA blocks are problematic
> because when they use the same codepoint for different glyphs, Emacs
> will select one of them at random, unless you tell it which one to
> select by customizing your fontset.  And that only works well if you
> don't need both glyphs in some situation.
>
> So I think that, in general, when you want to use such a font, you
> must do what Andy suggested, because Emacs is clueless: these
> codepoints don't tell to which character set or script they belong,
> they don't tell anything about their properties, etc.  Emacs needs
> help.  You can make that setting part of your mode, and it will work
> on all systems.
>
> > However, on Linux/Cygwin such mapping is not necessary.  All that is
> necessary is to declare the font.
>
> I think that's sheer luck, and will likely stop working once you have
> more than one font that covers the same codepoints.
>
> Btw, I don't really understand why you need this in Emacs.  I'm
> guessing that you do it because you actually want to display some icon
> on the mode line.  But Emacs can display images on the mode line
> without any PUA fonts: just create image files out of those glyphs,
> and use them directly.  Emacs doesn't need such "poor man's images".
> That should fix your problems, I think.
>
> Thanks.
>

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bug#22609: 24.5; Different Font display for windows32 implementation

[Eli Zaretskii]

> From: Matthew Fidler <matthew.fidler@gmail.com>
> Date: Thu, 11 Feb 2016 14:27:12 +0000
> Cc: 22609@debbugs.gnu.org
> 
> I thought that I declared what font to use by declaring the 'font property, so it would not be ambiguous to
> emacs what font to display the glyph with.

There is not 'font' property, AFAIK.  Perhaps you meant to define a
face that uses the font?  That's not what your Lisp does, AFAIU.

bug#22609: 24.5; Different Font display for windows32 implementation

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> So I think that, in general, when you want to use such a font, you
> must do what Andy suggested, because Emacs is clueless: these
> codepoints don't tell to which character set or script they belong,
> they don't tell anything about their properties, etc.  Emacs needs
> help.  You can make that setting part of your mode, and it will work
> on all systems.

So this doesn't seem like a bug in Emacs, and I'm closing this bug
report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no