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_GFX_X_X11_ATOM_CACHE_H_ 6 #define UI_GFX_X_X11_ATOM_CACHE_H_ 7 8 #include <map> 9 #include <string> 10 11 #include "base/basictypes.h" 12 #include "ui/gfx/gfx_export.h" 13 14 typedef unsigned long Atom; 15 typedef struct _XDisplay XDisplay; 16 17 namespace ui { 18 19 // Pre-caches all Atoms on first use to minimize roundtrips to the X11 20 // server. By default, GetAtom() will CHECK() that atoms accessed through 21 // GetAtom() were passed to the constructor, but this behaviour can be changed 22 // with allow_uncached_atoms(). 23 class GFX_EXPORT X11AtomCache { 24 public: 25 // Preinterns the NULL terminated list of string |to_cache_ on |xdisplay|. 26 X11AtomCache(XDisplay* xdisplay, const char** to_cache); 27 ~X11AtomCache(); 28 29 // Returns the pre-interned Atom without having to go to the x server. 30 Atom GetAtom(const char*) const; 31 32 // When an Atom isn't in the list of items we've cached, we should look it 33 // up, cache it locally, and then return the result. 34 void allow_uncached_atoms() { uncached_atoms_allowed_ = true; } 35 36 private: 37 XDisplay* xdisplay_; 38 39 bool uncached_atoms_allowed_; 40 41 mutable std::map<std::string, Atom> cached_atoms_; 42 43 DISALLOW_COPY_AND_ASSIGN(X11AtomCache); 44 }; 45 46 } // namespace ui 47 48 #endif // UI_GFX_X_X11_ATOM_CACHE_H_ 49
