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annotate src/display.cc @ 14348:95c43fc8dbe1 stable rc-3-6-1-0

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3.6.1 release candidate 0 * configure.ac (AC_INIT): Version is now 3.6.1-rc0. (OCTAVE_RELEASE_DATE): Now 2012-02-07. * liboctave/Makefile.am: Bump liboctave revision version. * src/Makefile.am: Bump liboctave revision version.
author John W. Eaton <jwe@octave.org>
date Thu, 09 Feb 2012 11:25:04 -0500
parents 72c96de7a403
children 0eb1b1eb2c76
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1 /*
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2
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3 Copyright (C) 2009-2012 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 (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 "singleton-cleanup.h"
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38
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39 #include "display.h"
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40 #include "error.h"
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41
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42 display_info *display_info::instance = 0;
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43
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44 void
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45 display_info::init (bool query)
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46 {
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47 if (query)
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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 {
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55 dp = GetDeviceCaps (hdc, BITSPIXEL);
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56
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57 ht = GetDeviceCaps (hdc, VERTRES);
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58 wd = GetDeviceCaps (hdc, HORZRES);
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59
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60 double ht_mm = GetDeviceCaps (hdc, VERTSIZE);
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61 double wd_mm = GetDeviceCaps (hdc, HORZSIZE);
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62
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63 rx = wd * 25.4 / wd_mm;
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64 ry = ht * 25.4 / ht_mm;
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65 }
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66 else
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67 warning ("no graphical display found");
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68
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69 #elif defined (HAVE_FRAMEWORK_CARBON)
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70
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71 CGDirectDisplayID display = CGMainDisplayID ();
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72
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73 if (display)
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74 {
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75 dp = CGDisplayBitsPerPixel (display);
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76
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77 ht = CGDisplayPixelsHigh (display);
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78 wd = CGDisplayPixelsWide (display);
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79
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80 CGSize sz_mm = CGDisplayScreenSize (display);
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81
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82 // On modern Mac systems (>= 10.5) CGSize is a struct keeping 2
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83 // CGFloat values, but the CGFloat typedef is not present on
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84 // older systems, so use double instead.
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85 double ht_mm = sz_mm.height;
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86 double wd_mm = sz_mm.width;
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87
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88 rx = wd * 25.4 / wd_mm;
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89 ry = ht * 25.4 / ht_mm;
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90 }
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91 else
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92 warning ("no graphical display found");
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93
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94 #elif defined (HAVE_X_WINDOWS)
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95
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96 const char *display_name = getenv ("DISPLAY");
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97
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98 if (display_name && *display_name)
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99 {
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100 Display *display = XOpenDisplay (display_name);
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101
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102 if (display)
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103 {
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104 Screen *screen = DefaultScreenOfDisplay (display);
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105
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106 if (screen)
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107 {
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108 dp = DefaultDepthOfScreen (screen);
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109
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110 ht = HeightOfScreen (screen);
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111 wd = WidthOfScreen (screen);
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112
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113 int screen_number = XScreenNumberOfScreen (screen);
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114
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115 double ht_mm = DisplayHeightMM (display, screen_number);
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116 double wd_mm = DisplayWidthMM (display, screen_number);
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117
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118 rx = wd * 25.4 / wd_mm;
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119 ry = ht * 25.4 / ht_mm;
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120 }
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121 else
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122 warning ("X11 display has no default screen");
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123
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124 XCloseDisplay (display);
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125 }
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126 else
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127 warning ("unable to open X11 DISPLAY");
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128 }
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129 else
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130 warning ("X11 DISPLAY environment variable not set");
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131 #else
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132
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133 warning ("no graphical display found");
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134
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135 #endif
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136 }
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137 }
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138
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139 bool
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140 display_info::instance_ok (bool query)
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141 {
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142 bool retval = true;
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143
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144 if (! instance)
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145 {
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146 instance = new display_info (query);
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147
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148 if (instance)
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149 singleton_cleanup_list::add (cleanup_instance);
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150 }
8561
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151
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152 if (! instance)
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153 {
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154 ::error ("unable to create display_info object!");
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155
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156 retval = false;
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157 }
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158
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159 return retval;
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160 }