bug#1547: face-font-rescale-alist has no effect

bug#1547: face-font-rescale-alist has no effect

[Juanma Barranquero]

Package: emacs
Version: 23.0.60
X-Debbugs-CC: handa@m17n.org

[Just a reminder, so the issue is not lost]

Font rescaling is unimplemented in the new font backend.

It was already discussed on the list:

http://lists.gnu.org/archive/html/emacs-devel/2008-06/msg01155.html

bug#1547: face-font-rescale-alist has no effect

[Kenichi Handa]

In article <f7ccd24b0812120253m5f1b4f9en3a23f0ccc26b6b2d@mail.gmail.com>, "Juanma Barranquero" <lekktu@gmail.com> writes:

> [Just a reminder, so the issue is not lost]

> Font rescaling is unimplemented in the new font backend.

Thank you for the reminder.  I've just installed a fix.

---
Kenichi Handa
handa@m17n.org

bug#1547: face-font-rescale-alist has no effect

[Juanma Barranquero]

On Sat, Dec 13, 2008 at 04:30, Kenichi Handa <handa@m17n.org> wrote:

> Thank you for the reminder.  I've just installed a fix.

Font rescaling is a bit weird, though.

Using a test file with just two lines:

aeiou
áéíóú

and running emacs with this:

  emacs -q --eval "(add-to-list 'face-font-rescale-alist '(\"Courier
New\" . 1.5))" test.txt

the fonts used for the two lines are, respectively:

    uniscribe:-outline-Courier
New-normal-normal-normal-mono-13-*-*-*-c-*-iso8859-1
    uniscribe:-outline-Courier
New-normal-normal-normal-mono-19-*-*-*-c-*-iso10646-1

so the fist line appears normal, while the second one is rescaled.

bug#1547: face-font-rescale-alist has no effect

[Kenichi Handa]

In article <f7ccd24b0812140500t21cce387p3b267d4ccf08443d@mail.gmail.com>, "Juanma Barranquero" <lekktu@gmail.com> writes:

> On Sat, Dec 13, 2008 at 04:30, Kenichi Handa <handa@m17n.org> wrote:
> > Thank you for the reminder.  I've just installed a fix.

> Font rescaling is a bit weird, though.

> Using a test file with just two lines:

> aeiou
> áéíóú

> and running emacs with this:

>   emacs -q --eval "(add-to-list 'face-font-rescale-alist '(\"Courier
> New\" . 1.5))" test.txt

> the fonts used for the two lines are, respectively:

>     uniscribe:-outline-Courier
> New-normal-normal-normal-mono-13-*-*-*-c-*-iso8859-1
>     uniscribe:-outline-Courier
> New-normal-normal-normal-mono-19-*-*-*-c-*-iso10646-1

> so the fist line appears normal, while the second one is rescaled.


When Emacs creates the initial frame and selects the default
font, "(add-to-list ...)" is not yet evaluated, so if your
default fonts is 'Courier New', it is opened without
scaling.

What I currently don't understand is that the font rescaling
doesn't work for the default font in the above case even
after (clear-face-cache t).  I'm now investigating the
reason.

---
Kenichi Handa
handa@m17n.org

bug#1785: bug#1547: face-font-rescale-alist has no effect

[Andrew Hyatt]

"Juanma Barranquero" <lekktu@gmail.com> writes:

> Package: emacs
> Version: 23.0.60
> X-Debbugs-CC: handa@m17n.org
>
> [Just a reminder, so the issue is not lost]
>
> Font rescaling is unimplemented in the new font backend.
>
> It was already discussed on the list:
>
> http://lists.gnu.org/archive/html/emacs-devel/2008-06/msg01155.html

I'm looking at this for Emacs 25, just to see if it can reproduce.  I
believe this is still the case.  Here's how I attempted to reproduce it
(keep in mind I don't have any particular knowledge of this
functionality).

1) Start emacs with "emacs -Q" in a window (X-windows, or other system
capable of handling different fonts)
2) Eval, in the scratch buffer, (add-to-list 'face-font-rescale-alist
(cons (font-at 1) 4.0)).

From the variable docs, I would expect the text to get 4 times bigger
after changing the variable, but instead nothing happens. 

bug#1785: bug#1547: face-font-rescale-alist has no effect

[npostavs]

Andrew Hyatt <ahyatt@gmail.com> writes:
> I'm looking at this for Emacs 25, just to see if it can reproduce.  I
> believe this is still the case.  Here's how I attempted to reproduce it
> (keep in mind I don't have any particular knowledge of this
> functionality).
>
> 1) Start emacs with "emacs -Q" in a window (X-windows, or other system
> capable of handling different fonts)
> 2) Eval, in the scratch buffer, (add-to-list 'face-font-rescale-alist
> (cons (font-at 1) 4.0)).

I think that's not right format for face-font-rescale-alist, the car
should be a string, not a font object.  Doing

   (add-to-list 'face-font-rescale-alist '(".*" . 4.0))

and tnen opening a new frame gives enlarged text in the new frame, and
causes only buffer name in the modeline the original frame to be
enlarged.  Also it looks like the buffer name in the modeline of the new
frame is enlarged twice.  So it mostly works, but there is some
difficulty with the existing faces used in the current frame.

Doing

    emacs -Q --eval "(add-to-list 'face-font-rescale-alist '(\".*\" . 4.0))"

does give enlarged text in the initial frame.

bug#1785: bug#1547: face-font-rescale-alist has no effect

[Andrew Hyatt]

npostavs@users.sourceforge.net writes:

> Andrew Hyatt <ahyatt@gmail.com> writes:
>> I'm looking at this for Emacs 25, just to see if it can reproduce.  I
>> believe this is still the case.  Here's how I attempted to reproduce it
>> (keep in mind I don't have any particular knowledge of this
>> functionality).
>>
>> 1) Start emacs with "emacs -Q" in a window (X-windows, or other system
>> capable of handling different fonts)
>> 2) Eval, in the scratch buffer, (add-to-list 'face-font-rescale-alist
>> (cons (font-at 1) 4.0)).
>
> I think that's not right format for face-font-rescale-alist, the car
> should be a string, not a font object.  Doing
>
>    (add-to-list 'face-font-rescale-alist '(".*" . 4.0))
>
> and tnen opening a new frame gives enlarged text in the new frame, and
> causes only buffer name in the modeline the original frame to be
> enlarged.  Also it looks like the buffer name in the modeline of the new
> frame is enlarged twice.  So it mostly works, but there is some
> difficulty with the existing faces used in the current frame.
>
> Doing
>
>     emacs -Q --eval "(add-to-list 'face-font-rescale-alist '(\".*\" . 4.0))"
>
> does give enlarged text in the initial frame.

Thanks for the information.  I tried this out on a Mac and found that,
with your corrected expression, I was able to see roughly what you see,
with the exception that some faces were not rescaled for some reason,
except when I started it with the rescale list eval'd at emacs start
time.

So, as you note, there are still some bugs here, enough (IMHO) to leave
this open and at the same priority.

bug#1785: bug#1547: face-font-rescale-alist has no effect

[Eli Zaretskii]

> From: Andrew Hyatt <ahyatt@gmail.com>
> Date: Thu, 14 Jul 2016 00:04:16 -0400
> Cc: Juanma Barranquero <lekktu@gmail.com>, 1547@debbugs.gnu.org,
> 	1785@debbugs.gnu.org
> 
> >     emacs -Q --eval "(add-to-list 'face-font-rescale-alist '(\".*\" . 4.0))"
> >
> > does give enlarged text in the initial frame.
> 
> Thanks for the information.  I tried this out on a Mac and found that,
> with your corrected expression, I was able to see roughly what you see,
> with the exception that some faces were not rescaled for some reason,
> except when I started it with the rescale list eval'd at emacs start
> time.
> 
> So, as you note, there are still some bugs here, enough (IMHO) to leave
> this open and at the same priority.

Actually, I'd think the priority should be lowered, as rescaling all
the fonts makes little sense to me.  FWIW.

Of course, if someone wants to work on this, I will gladly help by
whatever advice I can give.

Thanks.

bug#1785: bug#1547: face-font-rescale-alist has no effect

[Lars Ingebrigtsen]

Kenichi Handa <handa@m17n.org> writes:

> In article
> <f7ccd24b0812120253m5f1b4f9en3a23f0ccc26b6b2d@mail.gmail.com>, "Juanma
> Barranquero" <lekktu@gmail.com> writes:
>
>> [Just a reminder, so the issue is not lost]
>
>> Font rescaling is unimplemented in the new font backend.
>
> Thank you for the reminder.  I've just installed a fix.

This was ten years ago, and as far as I can tell, font scaling works
just fine these days.  So I'm closing this bug report.  Please reopen if
there are any further issues that haven't been addressed in the meantime.

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