GNU bug report logs - #1785
Font scaling does not work for the default font in some cases

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Juanma Barranquero" <lekktu <at> gmail.com>
To: Bug-Gnu-Emacs <bug-gnu-emacs <at> gnu.org>
Subject: face-font-rescale-alist has no effect
Date: Fri, 12 Dec 2008 11:53:56 +0100

Package: emacs
Version: 23.0.60
X-Debbugs-CC: handa <at> 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

Message #10 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Kenichi Handa <handa <at> m17n.org>
To: "Juanma Barranquero" <lekktu <at> gmail.com>, 1547 <at> debbugs.gnu.org
Cc: bug-gnu-emacs <at> gnu.org, bug-submit-list <at> donarmstrong.com,
        bug-gnu-emacs <at> gnu.org
Subject: Re: bug#1547: face-font-rescale-alist has no effect
Date: Sat, 13 Dec 2008 12:30:26 +0900

In article <f7ccd24b0812120253m5f1b4f9en3a23f0ccc26b6b2d <at> mail.gmail.com>, "Juanma Barranquero" <lekktu <at> 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 <at> m17n.org

Message #20 received at 1547 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Kenichi Handa <handa <at> m17n.org>
To: "Juanma Barranquero" <lekktu <at> gmail.com>
Cc: 1547 <at> debbugs.gnu.org
Subject: Re: bug#1547: face-font-rescale-alist has no effect
Date: Tue, 16 Dec 2008 20:33:01 +0900

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

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

Message #25 received at 1547 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Juanma Barranquero" <lekktu <at> gmail.com>
To: "Kenichi Handa" <handa <at> m17n.org>
Cc: 1547 <at> debbugs.gnu.org
Subject: Re: bug#1547: face-font-rescale-alist has no effect
Date: Sun, 14 Dec 2008 14:00:39 +0100

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

Message #36 received at 1785 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Kenichi Handa <handa <at> m17n.org>
Cc: 1785 <at> debbugs.gnu.org
Subject: Re: bug#1547: face-font-rescale-alist has no effect
Date: Fri, 17 Apr 2009 00:23:51 -0400

> 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.

I think the problem here is that the opened font objects are already
stored in the LFACE_FONT entry of the default face.  Note that

M-: (set-face-attribute 'default nil :font (font-spec)) RET

successfully refreshes the face with the correct rescaling.

Message #41 received at 1785 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Kenichi Handa <handa <at> m17n.org>
Cc: 1785 <at> debbugs.gnu.org
Subject: Re: bug#1547: face-font-rescale-alist has no effect
Date: Sat, 18 Apr 2009 00:11:20 -0400

> > 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.
>
> I think the problem here is that the opened font objects are already
> stored in the LFACE_FONT entry of the default face.  Note that
>
> M-: (set-face-attribute 'default nil :font (font-spec)) RET
>
> successfully refreshes the face with the correct rescaling.

Until a better solution comes along, I propose dealing with this
situation with the following hack in startup.el: check to see if the
init file changed face-font-rescale-alist, and reload the default face
if necessary.

What do you think?

*** trunk/lisp/startup.el.~1.527.~	2009-02-20 10:20:55.000000000 -0500
--- trunk/lisp/startup.el	2009-04-18 00:07:05.000000000 -0400
***************
*** 499,505 ****
  		     (delete (concat "PWD=" pwd)
  			     process-environment)))))
      (setq default-directory (abbreviate-file-name default-directory))
!     (let ((menubar-bindings-done nil))
        (unwind-protect
  	  (command-line)
  	;; Do this again, in case .emacs defined more abbreviations.
--- 499,506 ----
  		     (delete (concat "PWD=" pwd)
  			     process-environment)))))
      (setq default-directory (abbreviate-file-name default-directory))
!     (let ((menubar-bindings-done nil)
! 	  (old-face-font-rescale-alist face-font-rescale-alist))
        (unwind-protect
  	  (command-line)
  	;; Do this again, in case .emacs defined more abbreviations.
***************
*** 540,545 ****
--- 541,551 ----
  		  (not (and initial-window-system
  			    (not noninteractive)
  			    (not (eq initial-window-system 'pc)))))
+ 	  ;; If face-font-rescale-alist has changed, reload the
+ 	  ;; default font.
+ 	  (unless (eq face-font-rescale-alist
+ 		      old-face-font-rescale-alist)
+ 	    (set-face-attribute 'default nil :font (font-spec)))
  	  ;; Modify the initial frame based on what .emacs puts into
  	  ;; ...-frame-alist.
  	  (if (fboundp 'frame-notice-user-settings)

Diff finished.  Sat Apr 18 00:07:09 2009

Message #46 received at 1785 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: 1785 <at> debbugs.gnu.org, Kenichi Handa <handa <at> m17n.org>
Subject: Re: bug#1785: bug#1547: face-font-rescale-alist has no effect
Date: Sat, 18 Apr 2009 14:14:52 -0400

>> > 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.
>> 
>> I think the problem here is that the opened font objects are already
>> stored in the LFACE_FONT entry of the default face.  Note that
>> 
>> M-: (set-face-attribute 'default nil :font (font-spec)) RET
>> 
>> successfully refreshes the face with the correct rescaling.

> Until a better solution comes along, I propose dealing with this
> situation with the following hack in startup.el: check to see if the
> init file changed face-font-rescale-alist, and reload the default face
> if necessary.

Can't we fix it right and make clear-face-cache refresh the default face
as well?  If the right fix is really too much trouble, then I guess your
workaround is OK, but then it needs to come with a heavy dose of
comments explaining why it's there and how to get rid of it.


        Stefan

Message #51 received at 1785 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 1785 <at> debbugs.gnu.org, Kenichi Handa <handa <at> m17n.org>
Subject: Re: bug#1785: bug#1547: face-font-rescale-alist has no effect
Date: Wed, 22 Apr 2009 10:04:52 -0400

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>> Until a better solution comes along, I propose dealing with this
>> situation with the following hack in startup.el: check to see if the
>> init file changed face-font-rescale-alist, and reload the default face
>> if necessary.
>
> Can't we fix it right and make clear-face-cache refresh the default face
> as well?  If the right fix is really too much trouble, then I guess your
> workaround is OK, but then it needs to come with a heavy dose of
> comments explaining why it's there and how to get rid of it.

I think the right fix is to refresh all font objects that have already
been created.  However, there's currently no way to find them.  At
startup, however, I think only the default face has a font object
assigned to it---that's why I suggested this hack.

Yeah, it's a pretty awful hack, but I don't see a better short-term
solution.

Message #56 received at 1785 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 1785 <at> debbugs.gnu.org, Kenichi Handa <handa <at> m17n.org>
Subject: Re: bug#1785: bug#1547: face-font-rescale-alist has no effect
Date: Sat, 25 Apr 2009 10:26:42 -0400

I have checked in the work-around for this bug.  A more comprehenssive
fix can wait till after the release.  In the meantime, I'll downgrade
the bug severity to normal.

Message #61 received at 1785 <at> debbugs.gnu.org (full text, mbox):

From: Andrew Hyatt <ahyatt <at> gmail.com>
To: "Juanma Barranquero" <lekktu <at> gmail.com>
Cc: Bug-Gnu-Emacs <bug-gnu-emacs <at> gnu.org>, 1547 <at> debbugs.gnu.org,
 1785 <at> debbugs.gnu.org
Subject: Re: bug#1547: face-font-rescale-alist has no effect
Date: Wed, 06 Jan 2016 23:14:16 -0500

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

> Package: emacs
> Version: 23.0.60
> X-Debbugs-CC: handa <at> 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. 

Message #64 received at 1785 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: Andrew Hyatt <ahyatt <at> gmail.com>
Cc: Juanma Barranquero <lekktu <at> gmail.com>, 1547 <at> debbugs.gnu.org,
 1785 <at> debbugs.gnu.org
Subject: Re: bug#1785: bug#1547: face-font-rescale-alist has no effect
Date: Sat, 09 Jul 2016 15:40:14 -0400

Andrew Hyatt <ahyatt <at> 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.

Message #67 received at 1785 <at> debbugs.gnu.org (full text, mbox):

From: Andrew Hyatt <ahyatt <at> gmail.com>
To: npostavs <at> users.sourceforge.net
Cc: Juanma Barranquero <lekktu <at> gmail.com>, 1547 <at> debbugs.gnu.org,
 1785 <at> debbugs.gnu.org
Subject: Re: bug#1785: bug#1547: face-font-rescale-alist has no effect
Date: Thu, 14 Jul 2016 00:04:16 -0400

npostavs <at> users.sourceforge.net writes:

> Andrew Hyatt <ahyatt <at> 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.

Message #70 received at 1785 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Andrew Hyatt <ahyatt <at> gmail.com>
Cc: 1785 <at> debbugs.gnu.org, lekktu <at> gmail.com, 1547 <at> debbugs.gnu.org,
 npostavs <at> users.sourceforge.net
Subject: Re: bug#1785: bug#1547: face-font-rescale-alist has no effect
Date: Thu, 14 Jul 2016 18:08:41 +0300

> From: Andrew Hyatt <ahyatt <at> gmail.com>
> Date: Thu, 14 Jul 2016 00:04:16 -0400
> Cc: Juanma Barranquero <lekktu <at> gmail.com>, 1547 <at> debbugs.gnu.org,
> 	1785 <at> 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.

Message #73 received at 1785 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Kenichi Handa <handa <at> m17n.org>
Cc: Juanma Barranquero <lekktu <at> gmail.com>, 1547 <at> debbugs.gnu.org,
 1785 <at> debbugs.gnu.org
Subject: Re: bug#1547: face-font-rescale-alist has no effect
Date: Thu, 31 Oct 2019 18:58:31 +0100

Kenichi Handa <handa <at> m17n.org> writes:

> In article
> <f7ccd24b0812120253m5f1b4f9en3a23f0ccc26b6b2d <at> mail.gmail.com>, "Juanma
> Barranquero" <lekktu <at> 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

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