content: {-
  waymonad A wayland compositor in the spirit of xmonad
  Copyright (C) 2018  Markus Ongyerth
  
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
  
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
  
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  
  Reach us at https://github.com/ongy/waymonad
  -}
  {-# LANGUAGE OverloadedStrings #-}
  module Waymonad.Protocols.GammaControl
      ( getGammaBracket
      )
  where
  
  import Control.Monad.IO.Class (liftIO)
  import Foreign.Ptr (Ptr)
  
  import Graphics.Wayland.Server (DisplayServer)
  import Graphics.Wayland.WlRoots.GammaControl
  
  import Waymonad.GlobalFilter (registerGlobal)
  import Waymonad.Start (Bracketed (..))
  import Waymonad.Types (Way)
  
  makeManager :: DisplayServer -> Way vs a (Ptr WlrGammaManager)
  makeManager dsp = do
      ptr <- liftIO $ createGammaManager dsp
      registerGlobal "GammaControl" =<< liftIO (getGammaGlobal ptr)
      pure ptr
  
  getGammaBracket :: Bracketed vs DisplayServer a
  getGammaBracket = Bracketed makeManager (liftIO . destroyGammaManager)
  