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annotate src/display-available.c @ 28020:eb46a9f47164 stable release-5-2-0

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Avoid color changes in MS Windows GUI terminal (bug #57658). * scripts/miscellaneous/mkoctfile.m: Add the gcc compiler flag "-fdiagnostics-color=never" in case of MS Windows and the GUI is running. For the MS Windows CLI version the output looks very nice. Update year.
author Kai T. Ohlhus <k.ohlhus@gmail.com>
date Tue, 28 Jan 2020 10:57:35 +0900
parents 00f796120a6d
children b442ec6dda5c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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3 Copyright (C) 2012-2019 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
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9 the Free Software Foundation, either version 3 of the License, or
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10 (at your 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
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13 WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License 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 <https://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if defined (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 <stdlib.h>
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28
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29 #if defined (OCTAVE_USE_WINDOWS_API)
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30 # include <windows.h>
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31 #elif defined (HAVE_FRAMEWORK_CARBON)
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32 # include <Carbon/Carbon.h>
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33 #elif defined (HAVE_X_WINDOWS)
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34 # include <X11/Xlib.h>
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35 #endif
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36
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37 #include "display-available.h"
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38
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39 const char *
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40 display_available (int *dpy_avail)
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41 {
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42 *dpy_avail = 0;
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43
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44 const char *err_msg = "";
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45
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46 #if defined (OCTAVE_USE_WINDOWS_API)
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47
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48 HDC hdc = GetDC (0);
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49
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50 if (hdc)
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51 *dpy_avail = 1;
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52 else
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53 err_msg = "no graphical display found";
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54
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55 #elif defined (HAVE_FRAMEWORK_CARBON)
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56
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57 CGDirectDisplayID display = CGMainDisplayID ();
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58
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59 if (display)
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60 *dpy_avail = 1;
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61 else
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62 err_msg = "no graphical display found";
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63
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64 #elif defined (HAVE_X_WINDOWS)
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65
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66 const char *display_name = getenv ("DISPLAY");
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67
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68 if (display_name && *display_name)
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69 {
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70 Display *display = XOpenDisplay (display_name);
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71
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72 if (display)
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73 {
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74 Screen *screen = DefaultScreenOfDisplay (display);
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75
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76 if (! screen)
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77 err_msg = "X11 display has no default screen";
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78
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79 XCloseDisplay (display);
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80
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81 *dpy_avail = 1;
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82 }
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83 else
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84 err_msg = "unable to open X11 DISPLAY";
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85 }
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86 else
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87 err_msg = "X11 DISPLAY environment variable not set";
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88
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89 #else
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90
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91 err_msg = "no graphical display found";
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92
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93 #endif
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94
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95 return err_msg;
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96 }