video_driver.hpp

Go to the documentation of this file.

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD 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 General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef VIDEO_VIDEO_DRIVER_HPP
#define VIDEO_VIDEO_DRIVER_HPP
 
#include "../driver.h"
#include "../core/geometry_type.hpp"
#include "../core/math_func.hpp"
#include <vector>
 
extern std::string _ini_videodriver;
extern std::vector<Dimension> _resolutions;
extern Dimension _cur_resolution;
extern bool _rightclick_emulate;
 
class VideoDriver : public Driver {
  const uint DEFAULT_WINDOW_WIDTH = 640u;  
  const uint DEFAULT_WINDOW_HEIGHT = 480u; 
 
public:
  virtual void MakeDirty(int left, int top, int width, int height) = 0;
 
  virtual void MainLoop() = 0;
 
  virtual bool ChangeResolution(int w, int h) = 0;
 
  virtual bool ToggleFullscreen(bool fullscreen) = 0;
 
  virtual bool AfterBlitterChange()
  {
    return true;
  }
 
  virtual void AcquireBlitterLock() { }
 
  virtual void ReleaseBlitterLock() { }
 
  virtual bool ClaimMousePointer()
  {
    return true;
  }
 
  virtual bool HasGUI() const
  {
    return true;
  }
 
  virtual void EditBoxLostFocus() {}
 
  virtual void EditBoxGainedFocus() {}
 
  static VideoDriver *GetInstance() {
    return static_cast<VideoDriver*>(*DriverFactoryBase::GetActiveDriver(Driver::DT_VIDEO));
  }
 
protected:
  /*
   * Get the resolution of the main screen.
   */
  virtual Dimension GetScreenSize() const { return { DEFAULT_WINDOW_WIDTH, DEFAULT_WINDOW_HEIGHT }; }
 
  void UpdateAutoResolution()
  {
    if (_cur_resolution.width == 0 || _cur_resolution.height == 0) {
      /* Auto-detect a good resolution. We aim for 75% of the screen size.
       * Limit width times height times bytes per pixel to fit a 32 bit
       * integer, This way all internal drawing routines work correctly. */
      Dimension res = this->GetScreenSize();
      _cur_resolution.width  = ClampU(res.width  * 3 / 4, DEFAULT_WINDOW_WIDTH, UINT16_MAX / 2);
      _cur_resolution.height = ClampU(res.height * 3 / 4, DEFAULT_WINDOW_HEIGHT, UINT16_MAX / 2);
    }
  }
};
 
#endif /* VIDEO_VIDEO_DRIVER_HPP */