monitor_reconfigure_main.h

// Copyright (c) 2009 The Chromium OS 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 MONITOR_RECONFIGURE_MONITOR_RECONFIGURE_MAIN_H_
#define MONITOR_RECONFIGURE_MONITOR_RECONFIGURE_MAIN_H_

#include <map>

#include <X11/Xlib.h>
#include <X11/extensions/Xrandr.h>

namespace monitor_reconfig {

// MonitorReconfigureMain is the class responsible for setting the external
// monitor to the max resolution based on the modes supported by the native
// monitor and the external monitor
class MonitorReconfigureMain {
 public:
  MonitorReconfigureMain(Display* display, XRRScreenResources* screen_info);
  virtual ~MonitorReconfigureMain() {}

  // Main entry point
  void Run();

  // Returns whether an external monitor is connected
  bool IsExternalMonitorConnected();

 private:
  // Finds the max resolution mode for the given |output|
  XRRModeInfo* FindMaxResolution(XRROutputInfo* output);

  // Finds the best matching resolution as compared to the |matching_mode|
  XRRModeInfo* FindBestMatchingResolution(XRRModeInfo* matching_mode);

  // Initializes the |notebook_output_| and |external_output_| fields
  void DetermineOutputs();

  // Sets the resolution of the notebook's screen, the external monitor's
  // screen, and the overall virtual screen to the given size.
  void SetResolutions(XRRModeInfo* notebook_mode,
                      XRRModeInfo* external_mode,
                      XRRModeInfo* overall_screen_size);

  // Inline helper functions for FindBestMatchingResolution
  inline bool IsEqual(XRRModeInfo*, XRRModeInfo*);
  inline bool IsBiggerOrEqual(XRRModeInfo*, XRRModeInfo*);
  inline bool IsBetterMatching(XRRModeInfo* target, XRRModeInfo* to_match,
      XRRModeInfo* previous_best);

  // Mapping between mode XID's and mode information structures
  std::map<int, XRRModeInfo*> mode_map_;

  // X Resources needed between functions
  Display* display_;
  XRRScreenResources* screen_info_;
  XRROutputInfo* notebook_output_;
  XRROutputInfo* external_output_;
};

}  // namespace monitor_reconfig

#endif  // MONITOR_RECONFIGURE_MONITOR_RECONFIGURE_MAIN_H_