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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_X_ATOM_CACHE_H_
#define UI_GFX_X_ATOM_CACHE_H_
#include <cstring>
#include "base/compiler_specific.h"
#include "base/component_export.h"
#include "base/containers/flat_map.h"
#include "base/memory/raw_ptr.h"
#include "ui/gfx/x/xproto.h"
namespace x11 {
class Connection;
// Gets the X atom for default display corresponding to atom_name.
// TODO(thomasanderson): This should be removed and usages replaced with
// Connection::GetAtom().
COMPONENT_EXPORT(X11) Atom GetAtom(const char* atom_name);
// Pre-caches all Atoms on first use to minimize round trips to the X11
// server. GetAtom() will CHECK() that atoms accessed
// through GetAtom() are not predefined.
class AtomCache {
public:
explicit AtomCache(Connection* connection);
AtomCache(const AtomCache&&) = delete;
AtomCache& operator=(const AtomCache&&) = delete;
~AtomCache();
// Returns the pre-interned Atom without having to go to the x server.
// On failure, None is returned.
Atom GetAtom(const char* name);
private:
struct Compare {
bool operator()(const char* lhs, const char* rhs) const {
return UNSAFE_TODO(strcmp(lhs, rhs)) < 0;
}
};
raw_ptr<Connection> connection_;
// Using base::flat_map, since accesses are common, but inserts are very rare.
base::flat_map<const char*, Atom, Compare> cached_atoms_;
// Most strings in `cached_atoms_` have static lifetime. This vector owns
// the ones that aren't. It should be empty in most cases.
std::vector<std::unique_ptr<std::string>> owned_strings_;
};
} // namespace x11
#endif // UI_GFX_X_ATOM_CACHE_H_
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