I tried using imv -t 0 file.png and imv -t 1 file.png without success, I always get a black canvas eventually.

LIke I mentioned previously, the best workaround sor far is to run imv as a server, and then do imv <PID> close all followed by imv <PID> open <FILE>.

I'll try using the slideshow. For now I'm using imv's IPC mechanism to workaround this, I'm using that in my Neovim plugin.

It's also worth mentioning that other "minimal" image visualizers like feh don't have this issue.

Also,

while true; do cat foo.png > target.png && sleep 0.01 && cat bar.png > target.png && sleep 0.01; done

Seems to work fine.

and

# This generates target.png
plantuml target.puml 

Doesn't reproduce it immediately but after a couple of runs.

It's very weird, because adding some sleep time between the cp's doesn't reproduce the issue:

while true; do cp -v foo.png target.png && sleep 0.01 && cp -v bar.png target.png && sleep 0.01; done

but I can easily reproduce the issue in one shot when using:

plantuml -pipe < test.puml > target.png

Alright, you can close this then. Thanks.

Build error:

FAILED: gtkgreet/gtkgreet.p/gtkgreet.c.o
cc -Igtkgreet/gtkgreet.p -Igtkgreet -I../gtkgreet-0.7/gtkgreet -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/fribidi -I/usr/include/cairo -I/usr/include/lzo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cloudproviders -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/json-c -I/usr/include/gtk-layer-shell -flto=auto -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wextra -Werror -std=c11 -Wno-unused-parameter -Wno-missing-braces -DLAYER_SHELL -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -fPIE -pthread -MD -MQ gtkgreet/gtkgreet.p/gtkgreet.c.o -MF gtkgreet/gtkgreet.p/gtkgreet.c.o.d -o gtkgreet/gtkgreet.p/gtkgreet.c.o -c ../gtkgreet-0.7/gtkgreet/gtkgreet.c
../gtkgreet-0.7/gtkgreet/gtkgreet.c: In function ‘create_gtkgreet’:
../gtkgreet-0.7/gtkgreet/gtkgreet.c:94:5: error: ‘G_APPLICATION_FLAGS_NONE’ is deprecated: Use 'G_APPLICATION_DEFAULT_FLAGS' instead [-Werror=deprecated-declarations]
   94 |     gtkgreet->app = gtk_application_new("wtf.kl.gtkgreet", G_APPLICATION_FLAGS_NONE);
      |     ^~~~~~~~
In file included from /usr/include/glib-2.0/gio/giotypes.h:30,
                 from /usr/include/glib-2.0/gio/gio.h:28,
                 from /usr/include/gtk-3.0/gdk/gdkapplaunchcontext.h:28,
                 from /usr/include/gtk-3.0/gdk/gdk.h:32,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from ../gtkgreet-0.7/gtkgreet/gtkgreet.c:3:
/usr/include/glib-2.0/gio/gioenums.h:1536:3: note: declared here
 1536 |   G_APPLICATION_FLAGS_NONE GLIB_DEPRECATED_ENUMERATOR_IN_2_74_FOR(G_APPLICATION_DEFAULT_FLAGS),
      |   ^~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
[7/8] Compiling C object gtkgreet/gtkgreet.p/window.c.o
ninja: build stopped: subcommand failed.
==> ERROR: A failure occurred in build().
    Aborting...

I fixed it by adding -Wno-deprecated-declarations.

Oh, if you mean the whole assert thing, then yes. But the root cause of both issues seem to be different.

Is this caused by a wlroots update? https://github.com/swaywm/sway/issues/7398 suggests that even chromium and mpv are broken on wayland.

This cannot be caused by wlroots since the error comes from imv-x11 not imv-wayland.

When running on a TTY it defaults to imv-x11 since there's not WAYLAND_DISPLAY isn't defined:

#!/bin/sh
if [ -n "${WAYLAND_DISPLAY}" ]; then
  exec imv-wayland "$@"
else
  exec imv-x11 "$@"
fi

It seems it tries to use the X11 version:

imv-x11: ../imv-v4.4.0/src/x11_window.c:109: imv_window_create: Assertion `window->x_display' failed.
Aborted (core dumped)

It seems to be a duplicate of #2.