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 #ifndef UI_BASE_X_X11_ATOM_CACHE_H_ 6 #define UI_BASE_X_X11_ATOM_CACHE_H_ 7 8 #include "base/basictypes.h" 9 #include "ui/base/ui_export.h" 10 11 #include <X11/Xlib.h> 12 13 #include <map> 14 #include <string> 15 16 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class. 17 #undef RootWindow 18 19 namespace ui { 20 21 // Pre-caches all Atoms on first use to minimize roundtrips to the X11 22 // server. By default, GetAtom() will CHECK() that atoms accessed through 23 // GetAtom() were passed to the constructor, but this behaviour can be changed 24 // with allow_uncached_atoms(). 25 class UI_EXPORT X11AtomCache { 26 public: 27 // Preinterns the NULL terminated list of string |to_cache_ on |xdisplay|. 28 X11AtomCache(Display* xdisplay, const char** to_cache); 29 ~X11AtomCache(); 30 31 // Returns the pre-interned Atom without having to go to the x server. 32 ::Atom GetAtom(const char*) const; 33 34 // When an Atom isn't in the list of items we've cached, we should look it 35 // up, cache it locally, and then return the result. 36 void allow_uncached_atoms() { uncached_atoms_allowed_ = true; } 37 38 private: 39 Display* xdisplay_; 40 41 bool uncached_atoms_allowed_; 42 43 mutable std::map<std::string, ::Atom> cached_atoms_; 44 45 DISALLOW_COPY_AND_ASSIGN(X11AtomCache); 46 }; 47 48 } // namespace ui 49 50 #endif // UI_BASE_X_X11_ATOM_CACHE_H_ 51
