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annotate src/display.cc @ 8874:bd1b1fe9c6e9 ss-3-1-53

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bump version info for snapshot
author John W. Eaton <jwe@octave.org>
date Wed, 25 Feb 2009 18:35:47 -0500
parents 016e14be00c6
children f2d354df53ee
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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 (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.h"
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38 #include "error.h"
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39
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40 display_info *display_info::instance = 0;
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41
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42 void
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43 display_info::init (void)
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44 {
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45 #if defined (OCTAVE_USE_WINDOWS_API)
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46
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47 HDC hdc = GetDC (0);
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48
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49 if (hdc)
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50 {
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51 dp = GetDeviceCaps (hdc, BITSPIXEL);
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52
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53 ht = GetDeviceCaps (hdc, VERTRES);
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54 wd = GetDeviceCaps (hdc, HORZRES);
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55
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56 double ht_mm = GetDeviceCaps (hdc, VERTSIZE);
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57 double wd_mm = GetDeviceCaps (hdc, HORZSIZE);
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58
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59 rx = wd * 25.4 / wd_mm;
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60 ry = ht * 25.4 / ht_mm;
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61 }
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62 else
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63 warning ("no graphical display found");
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64
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65 #elif defined (HAVE_FRAMEWORK_CARBON)
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66
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67 CGDirectDisplayID display = CGMainDisplayID ();
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68
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69 if (display)
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70 {
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71 dp = CGDisplayBitsPerPixel (display);
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72
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73 ht = CGDisplayPixelsHigh (display);
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74 wd = CGDisplayPixelsWide (display);
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75
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76 CGSize sz_mm = CGDisplayScreenSize (display);
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77
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78 // On modern Mac systems (>= 10.5) CGSize is a struct keeping 2
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79 // CGFloat values, but the CGFloat typedef is not present on
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80 // older systems, so use double instead.
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81 double ht_mm = sz_mm.height;
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82 double wd_mm = sz_mm.width;
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83
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84 rx = wd * 25.4 / wd_mm;
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85 ry = ht * 25.4 / ht_mm;
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86 }
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87 else
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88 warning ("no graphical display found");
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89
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90 #elif defined (HAVE_X_WINDOWS)
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91
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92 const char *display_name = getenv ("DISPLAY");
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93
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94 if (display_name && *display_name)
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95 {
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96 Display *display = XOpenDisplay (display_name);
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97
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98 if (display)
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99 {
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100 Screen *screen = DefaultScreenOfDisplay (display);
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101
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102 if (screen)
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103 {
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104 dp = DefaultDepthOfScreen (screen);
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105
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106 ht = HeightOfScreen (screen);
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107 wd = WidthOfScreen (screen);
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108
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109 int screen_number = XScreenNumberOfScreen (screen);
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110
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111 double ht_mm = DisplayHeightMM (display, screen_number);
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112 double wd_mm = DisplayWidthMM (display, screen_number);
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113
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114 rx = wd * 25.4 / wd_mm;
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115 ry = ht * 25.4 / ht_mm;
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116 }
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117 else
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118 warning ("X11 display has no default screen");
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119 }
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120 else
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121 warning ("unable to open X11 DISPLAY");
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122 }
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123 else
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124 warning ("X11 DISPLAY environment variable not set");
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125 #else
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126
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127 warning ("no graphical display found");
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128
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129 #endif
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130 }
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131
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132 bool
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133 display_info::instance_ok (void)
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134 {
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135 bool retval = true;
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136
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137 if (! instance)
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138 instance = new display_info ();
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139
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140 if (! instance)
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141 {
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142 ::error ("unable to create display_info object!");
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143
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144 retval = false;
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145 }
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146
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147 return retval;
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148 }
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149
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150 /*
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151 ;;; Local Variables: ***
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152 ;;; mode: C++ ***
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153 ;;; End: ***
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154 */