display.h

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2009-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave 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, either version 3 of the License, or
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// 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.
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// You should have received a copy of the GNU General Public License
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////////////////////////////////////////////////////////////////////////
 
#if ! defined (octave_display_h)
#define octave_display_h 1
 
#include "octave-config.h"
 
#include <string>
 
class Matrix;
 
namespace octave
{
  class display_info
  {
  public:
 
    // Create object with default values.  To be useful, you must call
    // initialize to find the actual system parameters for the given
    // display.
 
    display_info (void)
      : m_rx (72), m_ry (72), m_ht (1), m_wd (1), m_dp (0),
        m_dpy_avail (false), m_msg ()
    { }
 
    ~display_info (void) = default;
 
    display_info (const display_info&) = default;
 
    display_info& operator = (const display_info&) = default;
 
    void initialize (void);
 
    double x_dpi (void) const { return m_rx; }
 
    double y_dpi (void) const { return m_ry; }
 
    int height (void) const { return m_ht; }
 
    int width (void) const { return m_wd; }
 
    int depth (void) const { return m_dp; }
 
    bool display_available (void) const { return m_dpy_avail; }
 
    std::string message (void) const { return m_msg; }
 
  private:
 
    // X- and Y- Resolution of the display in dots (pixels) per inch.
    double m_rx;
    double m_ry;
 
    // Height, width, and depth of the display.
    int m_ht;
    int m_wd;
    int m_dp;
 
    bool m_dpy_avail;
 
    // Message associated with any initiailization failure.  Set if
    // m_dpy_avail is false.
    std::string m_msg;
  };
}
 
#endif