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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
test Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)


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