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annotate src/display.h @ 12386:c1ea9b90a272 release-3-4-x

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Added tag ss-3-3-92 for changeset c468c5b902b3
author John W. Eaton <jwe@octave.org>
date Sun, 06 Feb 2011 07:30:27 -0500
parents fd0a3ac60b0e
children 7dd7cccf0757
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1 /*
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2
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3 Copyright (C) 2009-2011 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 class Matrix;
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27
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28 class display_info
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29 {
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30 protected:
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31
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32 display_info (bool query = true)
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33 : ht (1), wd (1), dp (0), rx (72), ry (72)
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34 {
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35 init (query);
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36 }
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37
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38 public:
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39
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40 static int height (void)
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41 {
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42 return instance_ok () ? instance->do_height () : 0;
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43 }
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44
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45 static int width (void)
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46 {
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47 return instance_ok () ? instance->do_width () : 0;
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48 }
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49
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50 static int depth (void)
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51 {
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52 return instance_ok () ? instance->do_depth () : 0;
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53 }
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54
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55 static double x_dpi (void)
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56 {
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57 return instance_ok () ? instance->do_x_dpi () : 0;
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58 }
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59
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60 static double y_dpi (void)
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61 {
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62 return instance_ok () ? instance->do_y_dpi () : 0;
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63 }
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64
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65 // To disable querying the window system for defaults, this function
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66 // must be called before any other display_info function.
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67 static void no_window_system (void)
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68 {
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69 instance_ok (false);
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70 }
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71
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72 private:
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73
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74 static display_info *instance;
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75
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76 // Height, width, and depth of the display.
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77 int ht;
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78 int wd;
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79 int dp;
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80
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81 // X- and Y- Resolution of the display in dots (pixels) per inch.
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82 double rx;
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83 double ry;
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84
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85 int do_height (void) const { return ht; }
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86 int do_width (void) const { return wd; }
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87 int do_depth (void) const { return dp; }
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88
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89 double do_x_dpi (void) const { return rx; }
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90 double do_y_dpi (void) const { return ry; }
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91
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92 void init (bool query = true);
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93
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94 static bool instance_ok (bool query = true);
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95 };
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96
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97 #endif