chromeos: Support turning displays off in extended mode.

chromeos/display/output_configurator.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_
 #define CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 60 matching lines @@
     virtual void OnDisplayModeChangeFailed(OutputState failed_new_state) {}
   };
 
   class Delegate {
    public:
     // Called when displays are detected.
     virtual OutputState GetStateForOutputs(
         const std::vector<OutputInfo>& outputs) const = 0;
   };
 
+  // Flags that can be passed to SetDisplayPower().
+  static const int kSetDisplayPowerNoFlags                     = 0;
+  // Configure displays even if the passed-in state matches |power_state_|.
+  static const int kSetDisplayPowerForceProbe                  = 1 << 0;
+  // Do not change the state if multiple displays are connected or if the
+  // only connected display is external.
+  static const int kSetDisplayPowerOnlyIfSingleInternalDisplay = 1 << 1;
+
   OutputConfigurator();
   virtual ~OutputConfigurator();
 
   int connected_output_count() const { return connected_output_count_; }
 
   OutputState output_state() const { return output_state_; }
 
   void set_display_power_state(DisplayPowerState power_state) {
     power_state_ = power_state;
   }
@@ skipping 10 matching lines @@
 
   // Detects displays first time from unknown state.
   void Start();
 
   // Stop handling display configuration events/requests.
   void Stop();
 
   // Called when powerd notifies us that some set of displays should be turned
   // on or off.  This requires enabling or disabling the CRTC associated with
   // the display(s) in question so that the low power state is engaged.
-  // If |force_probe| is true, the displays will be configured even if
-  // |power_state| matches |power_state_|.
-  bool SetDisplayPower(DisplayPowerState power_state, bool force_probe);
+  // |flags| contains bitwise-or-ed kSetDisplayPower* values.
+  bool SetDisplayPower(DisplayPowerState power_state, int flags);
 
   // Force switching the display mode to |new_state|. Returns false if
   // it was called in a single-head or headless mode.
   bool SetDisplayMode(OutputState new_state);
 
   // Called when an RRNotify event is received.  The implementation is
   // interested in the cases of RRNotify events which correspond to output
   // add/remove events.  Note that Output add/remove events are sent in response
   // to our own reconfiguration operations so spurious events are common.
   // Spurious events will have no effect.
@@ skipping 129 matching lines @@
 
   // Indicates the time at which |output_state_| was entered.
   base::TimeTicks last_enter_state_time_;
 
   DISALLOW_COPY_AND_ASSIGN(OutputConfigurator);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_