Log Message:
Import compton-20150920 as x11/compton.

Compton is a compositor for X, and a fork of xcompmgr-dana.

Changes from xcompmgr:

  OpenGL backend (--backend glx), in addition to the old X Render backend.
  Inactive window transparency (-i) / dimming (--inactive-dim).
  Titlebar/frame transparency (-e).
  Menu transparency (-m, thanks to Dana).
  shadows are now enabled for argb windows, e.g. terminals with transparency
  removed serverside shadows (and simple compositing) to clean the code,
    the only option that remains is clientside shadows
  configuration files (see the man page for more details)
  colored shadows (--shadow-[red/green/blue])
  a new fade system
  VSync support (not always working)
  Blur of background of transparent windows, window color inversion (bad in
    performance)
  Some more options...