bug#43128: 27.1; DPI change not detected after switching to Emacs 27.1

[Vincent Bernat]

After upgrading from Emacs 26.3 (GTK backend) to Emacs 27.1 (GTK
backend), DPI changes are not detected anymore. I am using a laptop with
a HiDPI screen (144 dpi) and when switching to a regular external DPI
monitor (96 dpi), nothing is scaled down.

The change is signalled through XSETTINGS (using xsettingsd daemon in my
case). I have tried to look at the source code to check if there was a
way to detect if the change was detected but not applied, without
success. Also, a new frame on the same display still has its fonts
scaled incorrectly.

Thanks.



In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.22, cairo version 1.16.0)
of 2020-08-24, modified by Debian built on x86-grnet-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Debian GNU/Linux bullseye/sid

Recent messages:
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Configured using:
'configure --build x86_64-linux-gnu --prefix=/usr
--sharedstatedir=/var/lib --libexecdir=/usr/lib
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --enable-libsystemd --with-pop=yes
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --with-mailutils --build
x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
--libexecdir=/usr/lib --localstatedir=/var/lib
--infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd
--with-pop=yes
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --with-mailutils --with-cairo
--with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars
'CFLAGS=-g -O2 -fdebug-prefix-map=/build/emacs-ad1UB1/emacs-27.1+1=.
-fstack-protector-strong -Wformat -Werror=format-security -Wall'
'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD
JSON PDUMPER LCMS2 GMP

Important settings:
value of $LC_MESSAGES: en_US.utf8
value of $LANG: fr_FR.utf8
locale-coding-system: utf-8-unix

Major mode: C/*l

Minor modes in effect:
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flycheck-mode: t
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shell-dirtrack-mode: t
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/org-entities hides /usr/share/emacs/27.1/lisp/org/org-entities
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ox-man hides /usr/share/emacs/27.1/lisp/org/ox-man
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ol-irc hides /usr/share/emacs/27.1/lisp/org/ol-irc
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ol-eshell hides /usr/share/emacs/27.1/lisp/org/ol-eshell
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-eshell hides /usr/share/emacs/27.1/lisp/org/ob-eshell
/home/bernat/.emacs.d/site-lisp/org-9.3.6/org-num hides /usr/share/emacs/27.1/lisp/org/org-num
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-perl hides /usr/share/emacs/27.1/lisp/org/ob-perl
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-stan hides /usr/share/emacs/27.1/lisp/org/ob-stan
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-lob hides /usr/share/emacs/27.1/lisp/org/ob-lob
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ox-org hides /usr/share/emacs/27.1/lisp/org/ox-org
/home/bernat/.emacs.d/site-lisp/org-9.3.6/org-keys hides /usr/share/emacs/27.1/lisp/org/org-keys
/home/bernat/.emacs.d/site-lisp/org-9.3.6/org-table hides /usr/share/emacs/27.1/lisp/org/org-table
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-lua hides /usr/share/emacs/27.1/lisp/org/ob-lua
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-hledger hides /usr/share/emacs/27.1/lisp/org/ob-hledger
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-clojure hides /usr/share/emacs/27.1/lisp/org/ob-clojure
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-ref hides /usr/share/emacs/27.1/lisp/org/ob-ref
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ox hides /usr/share/emacs/27.1/lisp/org/ox
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-J hides /usr/share/emacs/27.1/lisp/org/ob-J
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-matlab hides /usr/share/emacs/27.1/lisp/org/ob-matlab
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-maxima hides /usr/share/emacs/27.1/lisp/org/ob-maxima
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-shen hides /usr/share/emacs/27.1/lisp/org/ob-shen

Features:
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grep ibuf-ext ibuffer ibuffer-loaddefs python tramp-sh tramp
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pp bbdb-message sendmail git-rebase nix-mode ffap smie nix-repl
nix-shell nix-store nix-instantiate nix-shebang nix-format nix gnus-kill
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Memory information:
((conses 16 1554451 810098)
(symbols 48 73742 4)
(strings 32 391691 79664)
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(vectors 16 150772)
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(buffers 1000 149))

[Vincent Bernat]

Hey!

After investigating a bit, I see that `read_settings()' is correctly
called and the DPI retrieved is correct. However, `apply_xft_settings()'
seems to be a noop for me. I am using the Debian package for
experimental. In the build logs, for the GTK build:

#v+
cd debian/build-gtk && CFLAGS="-g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wall" CPPFLAGS="-Wdate-time -D_FORTIFY_SOURCE=2" LDFLAGS="-Wl,-z,relro" REL_ALLOC=no /<<PKGBUILDDIR>>/debian/build-src/configure --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --with-cairo --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars
[...]
Does Emacs use -lxft? no
#v-

The lucid build has XFT:

#v+
cd debian/build-lucid && CFLAGS="-g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wall" CPPFLAGS="-Wdate-time -D_FORTIFY_SOURCE=2" LDFLAGS="-Wl,-z,relro" REL_ALLOC=no /<<PKGBUILDDIR>>/debian/build-src/configure --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --with-x=yes --with-x-toolkit=lucid --with-toolkit-scroll-bars --without-gsettings
#v-

Looking at the differences in the build, I see the GTK build tests until
FreeType then it doesn't look further for Xft:

#v+
checking for cairo >= 1.8.0... yes
checking for freetype2... yes
checking for fontconfig >= 2.2.0... yes
#v-

From configure.ac, I see that I go into the Cairo branch which disables

Xft:

#+begin_src sh
if test $HAVE_CAIRO = yes; then
dnl Strict linkers fail with
dnl ftfont.o: undefined reference to symbol 'FT_New_Face'
dnl if -lfreetype is not specified.
dnl The following is needed to set FREETYPE_LIBS.
EMACS_CHECK_MODULES([FREETYPE], [freetype2])

test "$HAVE_FREETYPE" = "no" && AC_MSG_ERROR(cairo requires libfreetype)

EMACS_CHECK_MODULES([FONTCONFIG], [fontconfig >= 2.2.0])

test "$HAVE_FONTCONFIG" = "no" && AC_MSG_ERROR(cairo requires libfontconfig)
dnl For the "Does Emacs use" message at the end.
HAVE_XFT=no
#+end_src

So, no XFT seems to mean, no DPI change is possible. Is that expected?

[Vincent Bernat]

From configure.ac, I see that I go into the Cairo branch which disables
#+begin_src sh
if test $HAVE_CAIRO = yes; then
dnl Strict linkers fail with
dnl ftfont.o: undefined reference to symbol 'FT_New_Face'
dnl if -lfreetype is not specified.
dnl The following is needed to set FREETYPE_LIBS.
EMACS_CHECK_MODULES([FREETYPE], [freetype2])
test "$HAVE_FREETYPE" = "no" && AC_MSG_ERROR(cairo requires libfreetype)
EMACS_CHECK_MODULES([FONTCONFIG], [fontconfig >= 2.2.0])
test "$HAVE_FONTCONFIG" = "no" && AC_MSG_ERROR(cairo requires libfontconfig)
dnl For the "Does Emacs use" message at the end.
HAVE_XFT=no
#+end_src
So, no XFT seems to mean, no DPI change is possible. Is that expected?

Disabling Cairo fixes the problem for me.

[YAMAMOTO Mitsuharu]

On Wed, 02 Sep 2020 16:28:38 +0900,

Post by Vincent Bernat
Hey!
After investigating a bit, I see that `read_settings()' is correctly
called and the DPI retrieved is correct. However, `apply_xft_settings()'
seems to be a noop for me.

The function apply_xft_settings wasn't a no-op when I originally
removed the dependency on Xft if USE_CAIRO. But it was changed to a
no-op as a workaround for Bug#36284.

As I mentioned in https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36284#8,
a proper fix would be to implement replacements for
XftDefaultSubstitute and XftDefaultSet.

YAMAMOTO Mitsuharu
***@math.s.chiba-u.ac.jp

[Vincent Bernat]

Post by YAMAMOTO Mitsuharu

Post by Vincent Bernat
After investigating a bit, I see that `read_settings()' is correctly
called and the DPI retrieved is correct. However, `apply_xft_settings()'
seems to be a noop for me.

The function apply_xft_settings wasn't a no-op when I originally
removed the dependency on Xft if USE_CAIRO. But it was changed to a
no-op as a workaround for Bug#36284.

It may be a bit late now that 27.1 is released, but #36284 has an easy
workaround of moving the default face outside init, while not being able
to adapt to the current desktop DPI settings has no obvious workaround
except restarting Emacs. I'll just compile Emacs without Cairo support
for now.

[Eli Zaretskii]

Date: Wed, 02 Sep 2020 10:20:18 +0200
It may be a bit late now that 27.1 is released, but #36284 has an easy
workaround of moving the default face outside init

Can you elaborate on that workaround? I don't think I understand what
you mean by "moving the default face outside init". Did you mean some
code change? if so, could you tell more about the change you had in
mind?

[Eli Zaretskii]

Date: Wed, 02 Sep 2020 16:58:59 +0900

Post by Vincent Bernat
After investigating a bit, I see that `read_settings()' is correctly
called and the DPI retrieved is correct. However, `apply_xft_settings()'
seems to be a noop for me.

The function apply_xft_settings wasn't a no-op when I originally
removed the dependency on Xft if USE_CAIRO. But it was changed to a
no-op as a workaround for Bug#36284.

Bug#36284 seems to be about an issue unrelated to DPI scaling. is
there perhaps a way to keep parts of it that will allow to adapt to
the DPI change?

As I mentioned in https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36284#8,
a proper fix would be to implement replacements for
XftDefaultSubstitute and XftDefaultSet.

How complicate will such a change be? Will it be simple and safe
enough to allow installing such a change on the emacs-27 branch?

Thanks.

[Vincent Bernat]

Post by Eli Zaretskii

Post by Vincent Bernat
It may be a bit late now that 27.1 is released, but #36284 has an easy
workaround of moving the default face outside init

Can you elaborate on that workaround? I don't think I understand what
you mean by "moving the default face outside init". Did you mean some
code change? if so, could you tell more about the change you had in
mind?

Oh, sorry, I thought the problem was when setting font in the early
init. In this case, the workaround would have been to move it to the
regular init. So, nevermind.