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
13namespace ui {
14
15X11AtomCache::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
33X11AtomCache::~X11AtomCache() {}
34
35XAtom 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
49