A lightweight compositor for X11
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Yuxuan Shui 3aed5599c3
glx: calculate residual in both directions
We only considered residual in the positive direction, i.e. we would set
dithering to zero if the color is (whole number + 0.0001). But we should
also set dithering to zero if color is (whole number - 0.0001).

Fixes #1064
3 weeks ago
.builds ci: freebsd: add missing dependency 3 years ago
.circleci Make experimental backends the new default 9 months ago
.github github: update git-clang-format-lint action 4 months ago
LICENSES More license stuff... 5 years ago
bin picom-trans: Added SPDX-License-Identifier 2 years ago
dbus-examples Update inverter.sh 3 years ago
man Add corner-radius-rules configuration option 2 months ago
media Added 48x48px raster of initial Compton logo 8 years ago
meson Made meson/install.sh executable 1 year ago
src glx: calculate residual in both directions 3 weeks ago
subprojects/test.h string_utils: add trim_both 11 months ago
tests tests: add corner-radius-rules to the parsing test 2 months ago
.clang-format file_watch: use kqueue on *BSD platforms 4 years ago
.clang-tidy clang-tidy: disable some noisy warnings 9 months ago
.editorconfig Coding style change 4 years ago
.gitignore gitignore: ignore language server indices 3 years ago
.gitmodules Vendor test.h 4 years ago
COPYING rename: documentation changes 4 years ago
Doxyfile Fix small misspellings 4 years ago
History.md README: Move old historical info out of main README 1 year ago
LICENSE.spdx rename: documentation changes 4 years ago
README.md core: drop xinerama 4 months ago
compton-default-fshader-win.glsl Feature: #183 custom window shader & #193 --no-fading-destroyed-argb 9 years ago
compton-fake-transparency-fshader-win.glsl Feature: #183 custom window shader & #193 --no-fading-destroyed-argb 9 years ago
compton.desktop set .desktop files to NoDisplay=true 2 years ago
desc.txt Misc: #49: Add CMake support 11 years ago
meson.build Bump version number 7 months ago
meson_options.txt meson: Allow building without compton compat. 3 years ago
picom-dbus.desktop set .desktop files to NoDisplay=true 2 years ago
picom.desktop meson.build: autostart picom 9 months ago
picom.sample.conf core: drop xinerama 4 months ago



picom is a compositor for X, and a fork of Compton.

This is a development branch, bugs to be expected

You can leave your feedback or thoughts in the discussion tab.

Change Log

See Releases



Assuming you already have all the usual building tools installed (e.g. gcc, python, meson, ninja, etc.), you still need:

  • libx11
  • libx11-xcb
  • libXext
  • xproto
  • xcb
  • xcb-damage
  • xcb-dpms
  • xcb-xfixes
  • xcb-shape
  • xcb-renderutil
  • xcb-render
  • xcb-randr
  • xcb-composite
  • xcb-image
  • xcb-present
  • xcb-glx
  • pixman
  • libdbus (optional, disable with the -Ddbus=false meson configure flag)
  • libconfig (optional, disable with the -Dconfig_file=false meson configure flag)
  • libGL, libEGL (optional, disable with the -Dopengl=false meson configure flag)
  • libpcre2 (optional, disable with the -Dregex=false meson configure flag)
  • libev
  • uthash

On Debian based distributions (e.g. Ubuntu), the needed packages are

libxext-dev libxcb1-dev libxcb-damage0-dev libxcb-dpms0-dev libxcb-xfixes0-dev libxcb-shape0-dev libxcb-render-util0-dev libxcb-render0-dev libxcb-randr0-dev libxcb-composite0-dev libxcb-image0-dev libxcb-present-dev libxcb-glx0-dev libpixman-1-dev libdbus-1-dev libconfig-dev libgl-dev libegl-dev libpcre2-dev libevdev-dev uthash-dev libev-dev libx11-xcb-dev meson

On Fedora, the needed packages are

dbus-devel gcc git libconfig-devel libdrm-devel libev-devel libX11-devel libX11-xcb libXext-devel libxcb-devel libGL-devel libEGL-devel meson pcre2-devel pixman-devel uthash-devel xcb-util-image-devel xcb-util-renderutil-devel xorg-x11-proto-devel

To build the documents, you need asciidoc

To build

$ git submodule update --init --recursive
$ meson setup --buildtype=release . build
$ ninja -C build

Built binary can be found in build/src

If you have libraries and/or headers installed at non-default location (e.g. under /usr/local/), you might need to tell meson about them, since meson doesn't look for dependencies there by default.

You can do that by setting the CPPFLAGS and LDFLAGS environment variables when running meson. Like this:

$ LDFLAGS="-L/path/to/libraries" CPPFLAGS="-I/path/to/headers" meson setup --buildtype=release . build

As an example, on FreeBSD, you might have to run meson with:

$ LDFLAGS="-L/usr/local/lib" CPPFLAGS="-I/usr/local/include" meson setup --buildtype=release . build
$ ninja -C build

To install

$ ninja -C build install

Default install prefix is /usr/local, you can change it with meson configure -Dprefix=<path> build

How to Contribute

All contributions are welcome!

New features you think should be included in picom, a fix for a bug you found - please open a PR!

You can take a look at the Issues.

Contributions to the documents and wiki are also appreciated.

Even if you don't want to add anything to picom, you are still helping by compiling and running this branch, and report any issue you can find.

Become a Collaborator

Becoming a collaborator of picom requires significant time commitment. You are expected to reply to issue reports, reviewing PRs, and sometimes fix bugs or implement new feature. You won't be able to push to the main branch directly, and all you code still has to go through code review.

If this sounds good to you, feel free to contact me.



The README for the original Compton project can be found here.


picom is free software, made available under the MIT and MPL-2.0 software licenses. See the individual source files for details.