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annotate libinterp/corefcn/display.h @ 20597:bc6daa38ff50

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eliminate more simple uses of error_state * graphics.cc: Eliminate simple uses of error_state.
author John W. Eaton <jwe@octave.org>
date Tue, 06 Oct 2015 14:47:41 -0400
parents 4197fc428c7d
children
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1 /*
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2
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4197fc428c7d maint: Update copyright notices for 2015.
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3 Copyright (C) 2009-2015 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 #if !defined (octave_display_h)
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24 #define octave_display_h 1
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25
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26 #include <string>
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27
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28 class Matrix;
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29
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30 class
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31 OCTINTERP_API
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32 display_info
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33 {
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34 protected:
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35
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36 display_info (bool query = true)
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37 : ht (1), wd (1), dp (0), rx (72), ry (72), dpy_avail (false),
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38 err_msg ()
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39 {
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40 init (query);
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41 }
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42
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43 public:
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44
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45 static int height (void)
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46 {
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47 return instance_ok () ? instance->do_height () : 0;
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48 }
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49
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50 static int width (void)
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51 {
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52 return instance_ok () ? instance->do_width () : 0;
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53 }
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54
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55 static int depth (void)
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56 {
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57 return instance_ok () ? instance->do_depth () : 0;
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58 }
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59
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60 static double x_dpi (void)
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61 {
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62 return instance_ok () ? instance->do_x_dpi () : 0;
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63 }
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64
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65 static double y_dpi (void)
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66 {
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67 return instance_ok () ? instance->do_y_dpi () : 0;
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68 }
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69
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70 static bool display_available (void)
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71 {
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72 std::string msg;
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73 return instance_ok () ? instance->do_display_available (msg) : false;
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74 }
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75
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76 static bool display_available (std::string& msg)
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77 {
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78 return instance_ok () ? instance->do_display_available (msg) : false;
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79 }
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80
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81 // To disable querying the window system for defaults, this function
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82 // must be called before any other display_info function.
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83 static void no_window_system (void)
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84 {
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85 instance_ok (false);
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86 }
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87
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88 private:
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89
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90 static display_info *instance;
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91
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92 static void cleanup_instance (void) { delete instance; instance = 0; }
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93
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94 // Height, width, and depth of the display.
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95 int ht;
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96 int wd;
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97 int dp;
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98
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99 // X- and Y- Resolution of the display in dots (pixels) per inch.
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100 double rx;
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101 double ry;
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102
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103 bool dpy_avail;
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104
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105 std::string err_msg;
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106
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107 int do_height (void) const { return ht; }
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108 int do_width (void) const { return wd; }
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109 int do_depth (void) const { return dp; }
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110
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111 double do_x_dpi (void) const { return rx; }
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112 double do_y_dpi (void) const { return ry; }
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113
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114 bool do_display_available (std::string& msg) const
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115 {
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116 msg = err_msg;
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117
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118 return dpy_avail;
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119 }
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120
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121 void init (bool query = true);
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122
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123 static bool instance_ok (bool query = true);
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124 };
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125
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126 #endif