Adding a Wayland basic toolkit

ui/wayland/wayland_message_pump.h

+// Copyright (c) 2011 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 UI_WAYLAND_WAYLAND_MESSAGE_PUMP_H_
+#define UI_WAYLAND_WAYLAND_MESSAGE_PUMP_H_
+
+#include <glib.h>
+#include <stdint.h>
+
+#include "base/basictypes.h"
+
+class WaylandDisplay;
+
+// The message pump handles Wayland specific event delivery. This message
+// pump uses the default glib context, so running a glib main loop with the
+// default context will allow looping through Wayland events.
+class WaylandMessagePump {
+ public:
+  WaylandMessagePump(WaylandDisplay* display);
+  virtual ~WaylandMessagePump();
+
+ protected:
+  // These are used to process the pump callbacks.
+  // HandlePrepare: is called during glib's prepare step and returns a timeout
+  //                that will be passed to the poll.
+  // HandleCheck:   called after HandlePrepare and returns whether
+  //                HandleDispatch should be called.
+  // HandleDispatch:is called after HandleCheck returns true and it will
+  //                dispatch a Wayland event.
+  virtual int HandlePrepare();
+  virtual bool HandleCheck();
+  virtual void HandleDispatch();
+ private:
+  struct WorkSource : public GSource {
+    WaylandMessagePump* pump;
+  };
+
+  // Actual callbacks for glib. These functions will just call the appropriate
+  // Handle* functions in a WaylandMessagePump object.
+  static gboolean SourcePrepare(GSource* source, gint* timeout);
+  static gboolean SourceCheck(GSource* source);
+  static gboolean SourceDispatch(GSource* source,
+                                 GSourceFunc callback,
+                                 gpointer data);
+  // Handles updates to the Wayland mask. This is used to signal when the
+  // compositor is done processing writable events.
+  static int SourceUpdate(uint32_t mask, void* data);
+
+  WaylandDisplay* display_;
+  WorkSource* source_;
+  GPollFD pfd_;
+  uint32_t mask_;
+
+  DISALLOW_COPY_AND_ASSIGN(WaylandMessagePump);
+};
+
+#endif