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author John W. Eaton <jwe@octave.org>
date Wed, 21 Jan 2009 21:48:24 -0500
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children e17f262a02cd
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1 /*
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2
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3 Copyright (C) 2009 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 <cstdlib>
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28
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29 #if defined (HAVE_X_WINDOWS)
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30 #include <X11/Xlib.h>
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31 #endif
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32
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33 #include "display.h"
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34 #include "error.h"
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35
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36 display_info *display_info::instance = 0;
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37
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38 void
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39 display_info::init (void)
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40 {
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41 #if defined (OCTAVE_USE_WINDOWS_API)
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42
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43 warning ("code to find screen properties is missing");
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44
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45 #elif defined (OCTAVE_USE_COCOA_API) // FIXME -- what should this be called?
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46
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47 warning ("code to find screen properties is missing");
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48
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49 #elif defined (HAVE_X_WINDOWS)
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50
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51 const char *display_name = getenv ("DISPLAY");
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52
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53 if (display_name && *display_name)
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54 {
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55 Display *display = XOpenDisplay (display_name);
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56
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57 if (display)
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58 {
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59 Screen *screen = DefaultScreenOfDisplay (display);
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60
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61 if (screen)
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62 {
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63 dp = DefaultDepthOfScreen (screen);
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64
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65 ht = HeightOfScreen (screen);
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66 wd = WidthOfScreen (screen);
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67
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68 int screen_number = XScreenNumberOfScreen (screen);
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69
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70 double ht_mm = DisplayHeightMM (display, screen_number);
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71 double wd_mm = DisplayWidthMM (display, screen_number);
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72
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73 rx = wd * 25.4 / wd_mm;
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74 ry = ht * 25.4 / ht_mm;
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75 }
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76 else
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77 warning ("X11 display has no default screen");
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78 }
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79 else
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80 warning ("unable to open X11 DISPLAY");
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81 }
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82 else
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83 warning ("X11 DISPLAY environment variable not set");
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84 #else
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85
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86 warning ("no graphical display found");
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87
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88 #endif
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89 }
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90
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91 bool
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92 display_info::instance_ok (void)
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93 {
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94 bool retval = true;
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95
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96 if (! instance)
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97 instance = new display_info ();
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98
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99 if (! instance)
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100 {
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101 ::error ("unable to create display_info object!");
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102
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103 retval = false;
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104 }
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105
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106 return retval;
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107 }
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108
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109 /*
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110 ;;; Local Variables: ***
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111 ;;; mode: C++ ***
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112 ;;; End: ***
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113 */