split the screeninfo class out to its own files

1 files changed, 114 insertions, 0 deletions

diff --git a/src/screeninfo.cc b/src/screeninfo.cc
new file mode 100644
index 00000000..586b5f30
--- /dev/null
+++ b/src/screeninfo.cc
@@ -0,0 +1,114 @@
+// -*- mode: C++; indent-tabs-mode: nil; -*-
+
+#ifdef    HAVE_CONFIG_H
+#  include "../config.h"
+#endif // HAVE_CONFIG_H
+
+#include "screeninfo.hh"
+#include "basedisplay.hh"
+
+using std::string;
+
+ScreenInfo::ScreenInfo(BaseDisplay *d, unsigned int num) {
+  basedisplay = d;
+  screen_number = num;
+
+  root_window = RootWindow(basedisplay->getXDisplay(), screen_number);
+
+  rect.setSize(WidthOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(),
+                                             screen_number)),
+               HeightOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(),
+                                              screen_number)));
+  /*
+    If the default depth is at least 8 we will use that,
+    otherwise we try to find the largest TrueColor visual.
+    Preference is given to 24 bit over larger depths if 24 bit is an option.
+  */
+
+  depth = DefaultDepth(basedisplay->getXDisplay(), screen_number);
+  visual = DefaultVisual(basedisplay->getXDisplay(), screen_number);
+  colormap = DefaultColormap(basedisplay->getXDisplay(), screen_number);
+  
+  if (depth < 8) {
+    // search for a TrueColor Visual... if we can't find one...
+    // we will use the default visual for the screen
+    XVisualInfo vinfo_template, *vinfo_return;
+    int vinfo_nitems;
+    int best = -1;
+
+    vinfo_template.screen = screen_number;
+    vinfo_template.c_class = TrueColor;
+
+    vinfo_return = XGetVisualInfo(basedisplay->getXDisplay(),
+                                  VisualScreenMask | VisualClassMask,
+                                  &vinfo_template, &vinfo_nitems);
+    if (vinfo_return) {
+      int max_depth = 1;
+      for (int i = 0; i < vinfo_nitems; ++i) {
+        if (vinfo_return[i].depth > max_depth) {
+          if (max_depth == 24 && vinfo_return[i].depth > 24)
+            break;          // prefer 24 bit over 32
+          max_depth = vinfo_return[i].depth;
+          best = i;
+        }
+      }
+      if (max_depth < depth) best = -1;
+    }
+
+    if (best != -1) {
+      depth = vinfo_return[best].depth;
+      visual = vinfo_return[best].visual;
+      colormap = XCreateColormap(basedisplay->getXDisplay(), root_window,
+                                 visual, AllocNone);
+    }
+
+    XFree(vinfo_return);
+  }
+
+  // get the default display string and strip the screen number
+  string default_string = DisplayString(basedisplay->getXDisplay());
+  const string::size_type pos = default_string.rfind(".");
+  if (pos != string::npos)
+    default_string.resize(pos);
+
+  display_string = string("DISPLAY=") + default_string + '.' +
+    itostring(static_cast<unsigned long>(screen_number));
+  
+#ifdef    XINERAMA
+  xinerama_active = False;
+
+  if (d->hasXineramaExtensions()) {
+    if (d->getXineramaMajorVersion() == 1) {
+      // we know the version 1(.1?) protocol
+
+      /*
+         in this version of Xinerama, we can't query on a per-screen basis, but
+         in future versions we should be able, so the 'activeness' is checked
+         on a pre-screen basis anyways.
+      */
+      if (XineramaIsActive(d->getXDisplay())) {
+        /*
+           If Xinerama is being used, there there is only going to be one screen
+           present. We still, of course, want to use the screen class, but that
+           is why no screen number is used in this function call. There should
+           never be more than one screen present with Xinerama active.
+        */
+        int num;
+        XineramaScreenInfo *info = XineramaQueryScreens(d->getXDisplay(), &num);
+        if (num > 0 && info) {
+          xinerama_areas.reserve(num);
+          for (int i = 0; i < num; ++i) {
+            xinerama_areas.push_back(Rect(info[i].x_org, info[i].y_org,
+                                          info[i].width, info[i].height));
+          }
+          XFree(info);
+
+          // if we can't find any xinerama regions, then we act as if it is not
+          // active, even though it said it was
+          xinerama_active = True;
+        }
+      }
+    }
+  }
+#endif // XINERAMA
+}