/usr/include/octave-4.0.0/octave/display.h is in liboctave-dev 4.0.0-3ubuntu9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 2009-2015 John W. Eaton
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 (at your
option) any later version.
Octave 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 Octave; see the file COPYING. If not, see
<http://www.gnu.org/licenses/>.
*/
#if !defined (octave_display_h)
#define octave_display_h 1
#include <string>
class Matrix;
class
OCTINTERP_API
display_info
{
protected:
display_info (bool query = true)
: ht (1), wd (1), dp (0), rx (72), ry (72), dpy_avail (false),
err_msg ()
{
init (query);
}
public:
static int height (void)
{
return instance_ok () ? instance->do_height () : 0;
}
static int width (void)
{
return instance_ok () ? instance->do_width () : 0;
}
static int depth (void)
{
return instance_ok () ? instance->do_depth () : 0;
}
static double x_dpi (void)
{
return instance_ok () ? instance->do_x_dpi () : 0;
}
static double y_dpi (void)
{
return instance_ok () ? instance->do_y_dpi () : 0;
}
static bool display_available (void)
{
std::string msg;
return instance_ok () ? instance->do_display_available (msg) : false;
}
static bool display_available (std::string& msg)
{
return instance_ok () ? instance->do_display_available (msg) : false;
}
// To disable querying the window system for defaults, this function
// must be called before any other display_info function.
static void no_window_system (void)
{
instance_ok (false);
}
private:
static display_info *instance;
static void cleanup_instance (void) { delete instance; instance = 0; }
// Height, width, and depth of the display.
int ht;
int wd;
int dp;
// X- and Y- Resolution of the display in dots (pixels) per inch.
double rx;
double ry;
bool dpy_avail;
std::string err_msg;
int do_height (void) const { return ht; }
int do_width (void) const { return wd; }
int do_depth (void) const { return dp; }
double do_x_dpi (void) const { return rx; }
double do_y_dpi (void) const { return ry; }
bool do_display_available (std::string& msg) const
{
msg = err_msg;
return dpy_avail;
}
void init (bool query = true);
static bool instance_ok (bool query = true);
};
#endif
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