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annotate libinterp/corefcn/cdisplay.c @ 18932:edc4791fbcb2

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avoid some old-style cast warnings * cdisplay.h, cdisplay.c: New files. Compile C code and headers with C compiler. * corefcn/module.mk: Include them in the appropriate lists. * display.cc (display_info::init): Call new octave_get_display_info function.
author John W. Eaton <jwe@octave.org>
date Thu, 17 Jul 2014 11:19:21 -0400
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18932
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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 const char *
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40 octave_get_display_info (int *ht, int *wd, int *dp, double *rx, double *ry,
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41 int *dpy_avail)
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42 {
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43 const char *msg = 0;
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44
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45 *dpy_avail = 0;
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46
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47 #if defined (OCTAVE_USE_WINDOWS_API)
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48
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49 HDC hdc = GetDC (0);
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50
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51 if (hdc)
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52 {
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53 *dp = GetDeviceCaps (hdc, BITSPIXEL);
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54
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55 *ht = GetDeviceCaps (hdc, VERTRES);
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56 *wd = GetDeviceCaps (hdc, HORZRES);
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57
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58 double ht_mm = GetDeviceCaps (hdc, VERTSIZE);
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59 double wd_mm = GetDeviceCaps (hdc, HORZSIZE);
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60
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61 *rx = *wd * 25.4 / wd_mm;
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62 *ry = *ht * 25.4 / ht_mm;
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63
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64 *dpy_avail = 1;
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65 }
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66 else
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67 msg = "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 #if defined (HAVE_CARBON_CGDISPLAYBITSPERPIXEL)
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76
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77 *dp = CGDisplayBitsPerPixel (display);
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78
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79 #else
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80
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81 /* FIXME: This will only work for MacOS > 10.5. For earlier versions
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82 this code is not needed (use CGDisplayBitsPerPixel instead). */
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83
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84 CGDisplayModeRef mode = CGDisplayCopyDisplayMode (display);
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85 CFStringRef pixelEncoding = CGDisplayModeCopyPixelEncoding (mode);
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86
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87 if (CFStringCompare (pixelEncoding, CFSTR (IO32BitDirectPixels), 0) == 0)
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88 *dp = 32;
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89 else if (CFStringCompare (pixelEncoding,
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90 CFSTR (IO16BitDirectPixels), 0) == 0)
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91 *dp = 16;
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92 else
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93 *dp = 8;
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94
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95 #endif
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96
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97 *ht = CGDisplayPixelsHigh (display);
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98 *wd = CGDisplayPixelsWide (display);
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99
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100 CGSize sz_mm = CGDisplayScreenSize (display);
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101
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102 /* For MacOS >= 10.6, CGSize is a struct keeping 2 CGFloat
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103 values, but the CGFloat typedef is not present on older
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104 systems, so use double instead. */
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105
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106 double ht_mm = sz_mm.height;
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107 double wd_mm = sz_mm.width;
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108
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109 *rx = *wd * 25.4 / wd_mm;
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110 *ry = *ht * 25.4 / ht_mm;
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111
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112 *dpy_avail = 1;
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113 }
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114 else
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115 msg = "no graphical display found";
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116
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117 #elif defined (HAVE_X_WINDOWS)
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118
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119 const char *display_name = getenv ("DISPLAY");
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120
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121 if (display_name && *display_name)
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122 {
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123 Display *display = XOpenDisplay (display_name);
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124
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125 if (display)
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126 {
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127 Screen *screen = DefaultScreenOfDisplay (display);
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128
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129 if (screen)
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130 {
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131 *dp = DefaultDepthOfScreen (screen);
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132
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133 *ht = HeightOfScreen (screen);
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134 *wd = WidthOfScreen (screen);
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135
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136 int screen_number = XScreenNumberOfScreen (screen);
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137
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138 double ht_mm = DisplayHeightMM (display, screen_number);
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139 double wd_mm = DisplayWidthMM (display, screen_number);
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140
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141 *rx = *wd * 25.4 / wd_mm;
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142 *ry = *ht * 25.4 / ht_mm;
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143 }
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144 else
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145 msg = "X11 display has no default screen";
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146
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147 XCloseDisplay (display);
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148
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149 *dpy_avail = 1;
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150 }
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151 else
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152 msg = "unable to open X11 DISPLAY";
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153 }
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154 else
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155 msg = "X11 DISPLAY environment variable not set";
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156
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157 #else
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158
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159 msg = "no graphical display found";
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160
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161 #endif
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162
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163 return msg;
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164 }