ui/gfx/x/x11_atom_cache.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/gfx/x/x11_atom_cache.h"
   6
   7 #include <X11/Xatom.h>
   8 #include <X11/Xlib.h>
   9
  10 #include "base/logging.h"
  11 #include "base/memory/scoped_ptr.h"
  12
  13 namespace ui {
  14
  15 X11AtomCache::X11AtomCache(XDisplay* xdisplay, const char** to_cache)
  16     : xdisplay_(xdisplay),
  17       uncached_atoms_allowed_(false) {
  18   int cache_count = 0;
  19   for (const char** i = to_cache; *i != NULL; i++)
  20     cache_count++;
  21
  22   scoped_ptr<XAtom[]> cached_atoms(new XAtom[cache_count]);
  23
  24   // Grab all the atoms we need now to minimize roundtrips to the X11 server.
  25   XInternAtoms(xdisplay_,
  26                const_cast<char**>(to_cache), cache_count, False,
  27                cached_atoms.get());
  28
  29   for (int i = 0; i < cache_count; ++i)
  30     cached_atoms_.insert(std::make_pair(to_cache[i], cached_atoms[i]));
  31 }
  32
  33 X11AtomCache::~X11AtomCache() {}
  34
  35 XAtom X11AtomCache::GetAtom(const char* name) const {
  36   std::map<std::string, Atom>::const_iterator it = cached_atoms_.find(name);
  37
  38   if (uncached_atoms_allowed_ && it == cached_atoms_.end()) {
  39     XAtom atom = XInternAtom(xdisplay_, name, false);
  40     cached_atoms_.insert(std::make_pair(name, atom));
  41     return atom;
  42   }
  43
  44   CHECK(it != cached_atoms_.end()) << " Atom " << name << " not found";
  45   return it->second;
  46 }
  47
  48 }  // namespace ui