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picom is a lightweight compositor for X11. It was forked from the original Compton because it seems to have become unmaintained[1].

There are three different render backends available: xrender, glx, and xr_glx_hybrid.


USE flags

USE flags for x11-misc/picom A lightweight compositor for X11 (previously a compton fork)

config-file Enable config file support
dbus Enable dbus support for anything that needs it (gpsd, gnomemeeting, etc)
doc Build documentation and man pages (requires app-text/asciidoc)
drm Enable support for using drm for vsync
opengl Enable features that require opengl (opengl backend, and opengl vsync methods)
pcre Add support for Perl Compatible Regular Expressions


root #emerge --ask x11-misc/picom


Configuration file can be specified by the --config parameter. By default, the configuration file is read from locations listed below.

An on-change configuration autoload is supported.


  • /etc/xdg/picom.conf - Global (system wide) configuration file.
  • ~/.config/picom.conf - Local (per user) configuration file.


It can be started as a background process:

user $picom --daemon


  1. [1], Last commit to master on April 30, 2017. Retrieved on March 10, 2021