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annotate src/display-available.c @ 31214:19bd1953fc1d stable

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GitHub-CI: Remove ubuntu-18.04 runners from build matrix. * .github/workflow/make.yaml (ubuntu): GitHub-hosted runners for ubuntu-18.04 are being deprecated. Remove them from build matrix. See also: https://github.com/actions/runner-images/issues/6002
author Markus Mützel <markus.muetzel@gmx.de>
date Tue, 30 Aug 2022 11:16:27 +0200
parents 796f54d4ddbf
children 597f3ee61a48
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2012-2022 The Octave Project Developers
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4 //
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5 // See the file COPYRIGHT.md in the top-level directory of this
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 #if defined (HAVE_CONFIG_H)
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27 # include "config.h"
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28 #endif
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29
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30 #include <stdlib.h>
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31
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32 #if defined (OCTAVE_USE_WINDOWS_API)
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33 # include <windows.h>
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34 #elif defined (HAVE_FRAMEWORK_CARBON)
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35 # include <Carbon/Carbon.h>
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36 #elif defined (HAVE_X_WINDOWS)
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37 # include <X11/Xlib.h>
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38 #endif
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39
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40 #include "display-available.h"
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41
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42 const char *
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43 display_available (int *dpy_avail)
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44 {
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45 *dpy_avail = 0;
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46
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47 const char *err_msg = "";
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48
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49 #if defined (OCTAVE_USE_WINDOWS_API)
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50
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51 HDC hdc = GetDC (0);
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52
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53 if (hdc)
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54 *dpy_avail = 1;
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55 else
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56 err_msg = "no graphical display found";
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57
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58 #elif defined (HAVE_FRAMEWORK_CARBON)
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59
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60 CGDirectDisplayID display = CGMainDisplayID ();
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61
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62 if (display)
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63 *dpy_avail = 1;
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64 else
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65 err_msg = "no graphical display found";
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66
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67 #elif defined (HAVE_X_WINDOWS)
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68
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69 const char *display_name = getenv ("DISPLAY");
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70
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71 if (display_name && *display_name)
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72 {
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73 Display *display = XOpenDisplay (display_name);
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74
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75 if (display)
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76 {
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77 Screen *screen = DefaultScreenOfDisplay (display);
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78
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79 if (! screen)
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80 err_msg = "X11 display has no default screen";
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81
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82 XCloseDisplay (display);
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83
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84 *dpy_avail = 1;
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85 }
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86 else
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87 err_msg = "unable to open X11 DISPLAY";
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88 }
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89 else
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90 err_msg = "X11 DISPLAY environment variable not set";
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91
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92 #else
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93
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94 err_msg = "no graphical display found";
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95
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96 #endif
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97
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98 return err_msg;
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99 }