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[chromium-blink-merge.git] / ui / gfx / x / x11_atom_cache.cc
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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.
5 #include "ui/gfx/x/x11_atom_cache.h"
7 #include <X11/Xatom.h>
8 #include <X11/Xlib.h>
10 #include "base/logging.h"
11 #include "base/memory/scoped_ptr.h"
13 namespace ui {
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++;
22 scoped_ptr<XAtom[]> cached_atoms(new XAtom[cache_count]);
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());
29 for (int i = 0; i < cache_count; ++i)
30 cached_atoms_.insert(std::make_pair(to_cache[i], cached_atoms[i]));
33 X11AtomCache::~X11AtomCache() {}
35 XAtom X11AtomCache::GetAtom(const char* name) const {
36 std::map<std::string, Atom>::const_iterator it = cached_atoms_.find(name);
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;
44 CHECK(it != cached_atoms_.end()) << " Atom " << name << " not found";
45 return it->second;
48 } // namespace ui