touchui: First pass at XInput2 message pump.

base/message_pump_glib_x.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MESSAGE_PUMP_GLIB_X_H
 #define BASE_MESSAGE_PUMP_GLIB_X_H
 
 #include "base/message_pump.h"
 #include "base/message_pump_glib.h"
 
 #include <bitset>
+#include <set>
 
 #include <glib.h>
 #include <gtk/gtk.h>
 #include <X11/X.h>
 
 namespace base {
 
 class MessagePumpGlibX : public MessagePumpForUI {
  public:
   MessagePumpGlibX();
   virtual ~MessagePumpGlibX();
 
   // MessagePumpForUI implementation.
   virtual bool RunOnce(GMainContext* context, bool block);
 
   // Indicates whether a GDK event was injected by chrome (when |true|) or if it
   // was captured and being processed by GDK (when |false|).
   bool IsDispatchingEvent(void) { return dispatching_event_; }
 
+#if defined(HAVE_XINPUT2)
+  // Setup an X Window for XInput2 events.
+  void SetupXInput2ForXWindow(Window xid);
+#endif
+
  private:
   static void EventDispatcherX(GdkEvent* event, gpointer data);
 
   // Update the lookup table and flag the events that should be captured and
   // processed so that GDK doesn't get to them.
   void InitializeEventsToCapture(void);
 
+#if defined(HAVE_XINPUT2)
+  // Initialize X2 input.
+  void InitializeXInput2(void);
+
+  // The opcode used for checking events.
+  int xiopcode_;
+
+  // The list of master pointer devices. We maintain this list so that it is not
+  // necessary to query X for the list of devices for each GdkWindow created.
+  std::set<int> masters_;
+
+  // The list of slave (physical) pointer devices.
+  // TODO(sad): This is currently unused, and may be removed eventually.
+  std::set<int> slaves_;
+#endif
+
   // The event source for GDK events.
   GSource* gdksource_;
 
   // Indicates whether a GDK event was injected by chrome (when |true|) or if it
   // was captured and being processed by GDK (when |false|).
   bool dispatching_event_;
 
 #if ! GTK_CHECK_VERSION(2,18,0)
 // GDK_EVENT_LAST was introduced in GTK+ 2.18.0. For earlier versions, we pick a
 // large enough value (the value of GDK_EVENT_LAST in 2.18.0) so that it works
 // for all versions.
 #define GDK_EVENT_LAST 37
 #endif
 
   // We do not want to process all the events ourselves. So we use a lookup
   // table to quickly check if a particular event should be handled by us or if
   // it should be passed on to the default GDK handler.
   std::bitset<LASTEvent> capture_x_events_;
   std::bitset<GDK_EVENT_LAST> capture_gdk_events_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePumpGlibX);
 };
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_PUMP_GLIB_X_H