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annotate libinterp/corefcn/cdisplay.c @ 20949:e456327188f9

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* cdisplay.c: Additional programming notes.
author John W. Eaton <jwe@octave.org>
date Sat, 19 Dec 2015 09:15:23 -0500
parents babc439a224f
children 40de9f8f23a6
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1 /*
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2
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3 Copyright (C) 2009-2014 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 <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 "cdisplay.h"
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38
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39 // Programming Note: This file exists so that we can hide system
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40 // header files that make heavy use of macros and C-style casts in a C
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41 // language file and avoid warnings about using old-style casts in C++.
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42 // Additionally, on OS X systems, including the Carbon.h header file
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43 // results in the declaration of a "panic" function that conflicts with
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44 // Octave's global panic function, so Carbon.h can't be included in any
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45 // file that also includes Octave's error.h header file.
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46
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47 // Please do NOT eliminate this file and move code from here to
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48 // display.cc.
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49
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50 const char *
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51 octave_get_display_info (int *ht, int *wd, int *dp, double *rx, double *ry,
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52 int *dpy_avail)
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53 {
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54 const char *msg = 0;
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55
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56 *dpy_avail = 0;
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57
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58 #if defined (OCTAVE_USE_WINDOWS_API)
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59
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60 HDC hdc = GetDC (0);
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61
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62 if (hdc)
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63 {
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64 *dp = GetDeviceCaps (hdc, BITSPIXEL);
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65
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66 *ht = GetDeviceCaps (hdc, VERTRES);
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67 *wd = GetDeviceCaps (hdc, HORZRES);
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68
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69 double ht_mm = GetDeviceCaps (hdc, VERTSIZE);
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70 double wd_mm = GetDeviceCaps (hdc, HORZSIZE);
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71
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72 *rx = *wd * 25.4 / wd_mm;
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73 *ry = *ht * 25.4 / ht_mm;
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74
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75 *dpy_avail = 1;
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76 }
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77 else
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78 msg = "no graphical display found";
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79
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80 #elif defined (HAVE_FRAMEWORK_CARBON)
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81
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82 CGDirectDisplayID display = CGMainDisplayID ();
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83
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84 if (display)
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85 {
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86 #if defined (HAVE_CARBON_CGDISPLAYBITSPERPIXEL)
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87
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88 *dp = CGDisplayBitsPerPixel (display);
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89
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90 #else
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91
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92 /* FIXME: This will only work for MacOS > 10.5. For earlier versions
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93 this code is not needed (use CGDisplayBitsPerPixel instead). */
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94
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95 CGDisplayModeRef mode = CGDisplayCopyDisplayMode (display);
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96 CFStringRef pixelEncoding = CGDisplayModeCopyPixelEncoding (mode);
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97
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98 if (CFStringCompare (pixelEncoding, CFSTR (IO32BitDirectPixels), 0) == 0)
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99 *dp = 32;
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100 else if (CFStringCompare (pixelEncoding,
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101 CFSTR (IO16BitDirectPixels), 0) == 0)
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102 *dp = 16;
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103 else
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104 *dp = 8;
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105
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106 #endif
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107
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108 *ht = CGDisplayPixelsHigh (display);
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109 *wd = CGDisplayPixelsWide (display);
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110
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111 CGSize sz_mm = CGDisplayScreenSize (display);
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112
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113 /* For MacOS >= 10.6, CGSize is a struct keeping 2 CGFloat
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114 values, but the CGFloat typedef is not present on older
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115 systems, so use double instead. */
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116
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117 double ht_mm = sz_mm.height;
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118 double wd_mm = sz_mm.width;
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119
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120 *rx = *wd * 25.4 / wd_mm;
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121 *ry = *ht * 25.4 / ht_mm;
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122
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123 *dpy_avail = 1;
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124 }
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125 else
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126 msg = "no graphical display found";
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127
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128 #elif defined (HAVE_X_WINDOWS)
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129
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130 const char *display_name = getenv ("DISPLAY");
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131
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132 if (display_name && *display_name)
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133 {
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134 Display *display = XOpenDisplay (display_name);
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135
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136 if (display)
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137 {
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138 Screen *screen = DefaultScreenOfDisplay (display);
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139
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140 if (screen)
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141 {
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142 *dp = DefaultDepthOfScreen (screen);
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143
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144 *ht = HeightOfScreen (screen);
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145 *wd = WidthOfScreen (screen);
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146
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147 int screen_number = XScreenNumberOfScreen (screen);
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148
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149 double ht_mm = DisplayHeightMM (display, screen_number);
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150 double wd_mm = DisplayWidthMM (display, screen_number);
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151
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152 *rx = *wd * 25.4 / wd_mm;
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153 *ry = *ht * 25.4 / ht_mm;
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154 }
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155 else
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156 msg = "X11 display has no default screen";
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157
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158 XCloseDisplay (display);
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159
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160 *dpy_avail = 1;
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161 }
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162 else
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163 msg = "unable to open X11 DISPLAY";
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164 }
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165 else
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166 msg = "X11 DISPLAY environment variable not set";
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167
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168 #else
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169
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170 msg = "no graphical display found";
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171
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172 #endif
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173
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174 return msg;
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175 }