GNU bug report logs - #54040
29.0.50; Text becomes blurry on PGTK/Wayland

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Po Lu <luangruo <at> yahoo.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#54040: closed (29.0.50; Text becomes blurry on PGTK/Wayland)
Date: Thu, 17 Mar 2022 04:24:01 +0000

[Message part 1 (text/plain, inline)]

Your message dated Thu, 17 Mar 2022 12:23:15 +0800
with message-id <87lex9nr64.fsf <at> yahoo.com>
and subject line Re: bug#54040: 29.0.50; Text becomes blurry on PGTK/Wayland
has caused the debbugs.gnu.org bug report #54040,
regarding 29.0.50; Text becomes blurry on PGTK/Wayland
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
54040: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=54040
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Thomas Jost <schnouki <at> schnouki.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; Text becomes blurry on PGTK/Wayland
Date: Thu, 17 Feb 2022 11:44:19 +0100

[Message part 3 (text/plain, inline)]

Hey folks,

I'm using a recent git build of Emacs on Arch Linux, with pgtk and
nativecomp. Since a recent update, text started becoming blurry when
scrolling with the mousewheel, or even just when inserting a newline. So
basically, any time text is "moved" without being fully redrawn.

I can reproduce it reliably with my own config, but can't with plain
`emacs -Q`. It also happens more reliably in emacsclient on my external
monitor, although it sometimes "flashes" as blurry text in emacs on my
laptop screen.

Other important details:
- I'm running Wayland with Sway (latest stable version)
- my laptop screen and external screen have different scale factor: 2
for laptop screen, 1 for external screen.

This can be fixed temporarily by focusing the blurred line/paragraph, or
with M-x redraw-display. But another scroll or newline will repeat the issue.

So, I used git bisect to try to find the faulty commit. The result is
that this behavior started with commit
6da021fce86a06a97b0bff76f69aa57759533dc9: "Fix artifacting on PGTK when
bits are copied with an alpha channel".

Attached is a patch that seems to solve this issue for me without
completely reverting that commit. I'm not sure if it's really a correct
fix; please email me if you need any more details or testing!

Best,
Thomas


In GNU Emacs 29.0.50 (build 8, x86_64-pc-linux-gnu, GTK+ Version 3.24.31, cairo version 1.17.4)
 of 2022-02-17 built on loki
Repository revision: eb0680bd57bd68ca369dc5133646e8ac9215854c
Repository branch: master
System Description: Arch Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
 --with-sound=alsa --with-modules --without-libotf --without-m17n-flt
 --without-gconf --without-gsettings --with-native-compilation
 --with-xinput2 --with-pgtk --without-xaw3d --with-sound=no
 --without-gpm --without-compress-install
 '--program-transform-name=s/\([ec]tags\)/\1.emacs/'
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions
 -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security
 -fstack-clash-protection -fcf-protection'
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now
 'CXXFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions
 -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security
 -fstack-clash-protection -fcf-protection -Wp,-D_GLIBCXX_ASSERTIONS''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS HARFBUZZ JPEG JSON LCMS2
LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PGTK PNG
RSVG SECCOMP SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP XIM GTK3 ZLIB

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

Major mode: C/*l

Minor modes in effect:
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Load-path shadows:
/home/schnouki/.quicklisp/dists/quicklisp/software/slime-v2.26.1/slime hides /home/schnouki/.emacs.d/elpa/slime-20220210.1512/slime
/home/schnouki/.quicklisp/dists/quicklisp/software/slime-v2.26.1/slime-autoloads hides /home/schnouki/.emacs.d/elpa/slime-20220210.1512/slime-autoloads
/home/schnouki/.quicklisp/dists/quicklisp/software/slime-v2.26.1/slime-tests hides /home/schnouki/.emacs.d/elpa/slime-20220210.1512/slime-tests
/home/schnouki/.emacs.d/elpa/transient-20220130.1941/transient hides /home/schnouki/tmp/emacs-git/src/emacs-git/lisp/transient
/home/schnouki/.emacs.d/elpa/faceup-20170925.1946/faceup hides /home/schnouki/tmp/emacs-git/src/emacs-git/lisp/emacs-lisp/faceup

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Memory information:
((conses 16 1455501 799687)
 (symbols 48 79315 4)
 (strings 32 781537 91826)
 (string-bytes 1 48029787)
 (vectors 16 125486)
 (vector-slots 8 3943096 1928905)
 (floats 8 440 2087)
 (intervals 56 2724 379)
 (buffers 992 20))

-- 
Thomas

[pgtk-blurry-font.patch (text/x-patch, attachment)]

[Message part 5 (message/rfc822, inline)]

From: Po Lu <luangruo <at> yahoo.com>
To: Andrew Cohen <acohen <at> ust.hk>
Cc: 54040-done <at> debbugs.gnu.org
Subject: Re: bug#54040: 29.0.50; Text becomes blurry on PGTK/Wayland
Date: Thu, 17 Mar 2022 12:23:15 +0800

[When replying to bug reports, please use "Reply All" to reply, so that
the bug tracker can record your messages.]

Andrew Cohen <acohen <at> ust.hk> writes:

>>>>>> "PL" == Po Lu <luangruo <at> yahoo.com> writes:
>
> [...]
>
>     PL> Now done, please see if that solves your problem.  Thanks.
>
> Seems too so far. I think its safe to close the bug---if it re-arises we
> can always open a new one.
>
> Thanks very much,
> Andy

Thanks for testing, closing.

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