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annotate libinterp/corefcn/display.cc @ 20947:ecb95c6384f2

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backout changeset e74e617060cf
author John W. Eaton <jwe@octave.org>
date Sat, 19 Dec 2015 07:54:00 -0600
parents 6eff66fb8a02
children 850e3d2533d4
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1 /*
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2
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3 Copyright (C) 2009-2015 John W. Eaton
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include "singleton-cleanup.h"
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28
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29 #include "cdisplay.h"
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30 #include "display.h"
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31 #include "error.h"
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32
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33 display_info *display_info::instance = 0;
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34
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35 void
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36 display_info::init (bool query)
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37 {
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38 if (query)
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39 {
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40 int avail = 0;
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41
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42 const char *msg = octave_get_display_info (&ht, &wd, &dp, &rx, &ry,
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43 &avail);
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44
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45 dpy_avail = avail;
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46
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47 if (msg)
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48 err_msg = msg;
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49 }
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50 }
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51
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52 bool
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53 display_info::instance_ok (bool query)
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54 {
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55 bool retval = true;
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56
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57 if (! instance)
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58 {
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59 instance = new display_info (query);
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60
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61 if (instance)
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62 singleton_cleanup_list::add (cleanup_instance);
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63 }
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64
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65 if (! instance)
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66 {
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67 error ("unable to create display_info object!");
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68
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69 retval = false;
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70 }
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71
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72 return retval;
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73 }