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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 
9 #include "base/logging.h"
10 #include "base/memory/scoped_ptr.h"
11 
12 namespace ui {
13 
X11AtomCache(Display * xdisplay,const char ** to_cache)14 X11AtomCache::X11AtomCache(Display* xdisplay, const char** to_cache)
15     : xdisplay_(xdisplay),
16       uncached_atoms_allowed_(false) {
17   int cache_count = 0;
18   for (const char** i = to_cache; *i != NULL; i++)
19     cache_count++;
20 
21   scoped_ptr< ::Atom[]> cached_atoms(new ::Atom[cache_count]);
22 
23   // Grab all the atoms we need now to minimize roundtrips to the X11 server.
24   XInternAtoms(xdisplay_,
25                const_cast<char**>(to_cache), cache_count, False,
26                cached_atoms.get());
27 
28   for (int i = 0; i < cache_count; ++i)
29     cached_atoms_.insert(std::make_pair(to_cache[i], cached_atoms[i]));
30 }
31 
~X11AtomCache()32 X11AtomCache::~X11AtomCache() {}
33 
GetAtom(const char * name) const34 ::Atom X11AtomCache::GetAtom(const char* name) const {
35   std::map<std::string, ::Atom>::const_iterator it = cached_atoms_.find(name);
36 
37   if (uncached_atoms_allowed_ && it == cached_atoms_.end()) {
38     ::Atom atom = XInternAtom(xdisplay_, name, false);
39     cached_atoms_.insert(std::make_pair(name, atom));
40     return atom;
41   }
42 
43   CHECK(it != cached_atoms_.end()) << " Atom " << name << " not found";
44   return it->second;
45 }
46 
47 }  // namespace ui
48