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bug#43128: Acknowledgement (27.1; DPI change not detected after switchin
From: |
Vincent Bernat |
Subject: |
bug#43128: Acknowledgement (27.1; DPI change not detected after switching to Emacs 27.1) |
Date: |
Wed, 02 Sep 2020 09:28:38 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) |
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?
--
Make sure input cannot violate the limits of the program.
- The Elements of Programming Style (Kernighan & Plauger)
- bug#43128: Acknowledgement (27.1; DPI change not detected after switching to Emacs 27.1),
Vincent Bernat <=