Dogcows Code - chaz/openbox/blob - otk/screeninfo.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2
   3 #ifdef    HAVE_CONFIG_H
   4 #  include "../config.h"
   5 #endif // HAVE_CONFIG_H
   6
   7 extern "C" {
   8 #include <X11/Xlib.h>
   9 #include <X11/Xutil.h>
  10 }
  11
  12 #include "screeninfo.hh"
  13 #include "display.hh"
  14 #include "util.hh"
  15
  16 using std::string;
  17
  18 namespace otk {
  19
  20 ScreenInfo::ScreenInfo(unsigned int num) {
  21   _screen = num;
  22
  23   _root_window = RootWindow(OBDisplay::display, _screen);
  24
  25   _rect.setSize(WidthOfScreen(ScreenOfDisplay(OBDisplay::display,
  26                                               _screen)),
  27                HeightOfScreen(ScreenOfDisplay(OBDisplay::display,
  28                                               _screen)));
  29   /*
  30     If the default depth is at least 8 we will use that,
  31     otherwise we try to find the largest TrueColor visual.
  32     Preference is given to 24 bit over larger depths if 24 bit is an option.
  33   */
  34
  35   _depth = DefaultDepth(OBDisplay::display, _screen);
  36   _visual = DefaultVisual(OBDisplay::display, _screen);
  37   _colormap = DefaultColormap(OBDisplay::display, _screen);
  38
  39   if (_depth < 8) {
  40     // search for a TrueColor Visual... if we can't find one...
  41     // we will use the default visual for the screen
  42     XVisualInfo vinfo_template, *vinfo_return;
  43     int vinfo_nitems;
  44     int best = -1;
  45
  46     vinfo_template.screen = _screen;
  47     vinfo_template.c_class = TrueColor;
  48
  49     vinfo_return = XGetVisualInfo(OBDisplay::display,
  50                                   VisualScreenMask | VisualClassMask,
  51                                   &vinfo_template, &vinfo_nitems);
  52     if (vinfo_return) {
  53       int max_depth = 1;
  54       for (int i = 0; i < vinfo_nitems; ++i) {
  55         if (vinfo_return[i].depth > max_depth) {
  56           if (max_depth == 24 && vinfo_return[i].depth > 24)
  57             break;          // prefer 24 bit over 32
  58           max_depth = vinfo_return[i].depth;
  59           best = i;
  60         }
  61       }
  62       if (max_depth < _depth) best = -1;
  63     }
  64
  65     if (best != -1) {
  66       _depth = vinfo_return[best].depth;
  67       _visual = vinfo_return[best].visual;
  68       _colormap = XCreateColormap(OBDisplay::display, _root_window, _visual,
  69                                   AllocNone);
  70     }
  71
  72     XFree(vinfo_return);
  73   }
  74
  75   // get the default display string and strip the screen number
  76   string default_string = DisplayString(OBDisplay::display);
  77   const string::size_type pos = default_string.rfind(".");
  78   if (pos != string::npos)
  79     default_string.resize(pos);
  80
  81   _display_string = string("DISPLAY=") + default_string + '.' +
  82     otk::itostring(static_cast<unsigned long>(_screen));
  83
  84 #ifdef    XINERAMA
  85   _xinerama_active = False;
  86
  87   if (d->hasXineramaExtensions()) {
  88     if (d->getXineramaMajorVersion() == 1) {
  89       // we know the version 1(.1?) protocol
  90
  91       /*
  92         in this version of Xinerama, we can't query on a per-screen basis, but
  93         in future versions we should be able, so the 'activeness' is checked
  94         on a pre-screen basis anyways.
  95       */
  96       if (XineramaIsActive(OBDisplay::display)) {
  97         /*
  98           If Xinerama is being used, there there is only going to be one screen
  99           present. We still, of course, want to use the screen class, but that
 100           is why no screen number is used in this function call. There should
 101           never be more than one screen present with Xinerama active.
 102         */
 103         int num;
 104         XineramaScreenInfo *info = XineramaQueryScreens(OBDisplay::display,
 105                                                         &num);
 106         if (num > 0 && info) {
 107           _xinerama_areas.reserve(num);
 108           for (int i = 0; i < num; ++i) {
 109             _xinerama_areas.push_back(Rect(info[i].x_org, info[i].y_org,
 110                                            info[i].width, info[i].height));
 111           }
 112           XFree(info);
 113
 114           // if we can't find any xinerama regions, then we act as if it is not
 115           // active, even though it said it was
 116           _xinerama_active = True;
 117         }
 118       }
 119     }
 120   }
 121 #endif // XINERAMA
 122 }
 123
 124 }