content/renderer/gpu/compositor_thread.h

   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 CONTENT_RENDERER_GPU_COMPOSITOR_THREAD_H_
   6 #define CONTENT_RENDERER_GPU_COMPOSITOR_THREAD_H_
   7
   8 #include <map>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "content/renderer/render_view_impl.h"
  13 #include "ipc/ipc_channel_proxy.h"
  14 #include "webkit/glue/webthread_impl.h"
  15
  16 namespace WebKit {
  17 class WebInputEvent;
  18 }
  19
  20 class InputEventFilter;
  21
  22 // The CompositorThread class manages the background thread for the compositor.
  23 // The CompositorThread instance can be assumed to outlive the background
  24 // thread it manages.
  25 class CompositorThread {
  26  public:
  27   // |main_listener| refers to the central IPC message listener that lives on
  28   // the main thread, where all incoming IPC messages are first handled.
  29   explicit CompositorThread(IPC::Listener* main_listener);
  30   ~CompositorThread();
  31
  32   // This MessageFilter should be added to allow input events to be redirected
  33   // to the compositor's thread.
  34   IPC::ChannelProxy::MessageFilter* GetMessageFilter() const;
  35
  36   // Callable from the main thread only.
  37   void AddInputHandler(int routing_id,
  38                        int input_handler_id,
  39                        const base::WeakPtr<RenderViewImpl>& render_view_impl);
  40
  41   webkit_glue::WebThreadImpl* GetWebThread() { return &thread_; }
  42
  43   MessageLoop* message_loop() { return thread_.message_loop(); }
  44
  45  private:
  46   // Callback only from the compositor's thread.
  47   void RemoveInputHandler(int routing_id);
  48
  49   // Called from the compositor's thread.
  50   void HandleInputEvent(int routing_id,
  51                         const WebKit::WebInputEvent* input_event);
  52
  53   // Called from the compositor's thread.
  54   void AddInputHandlerOnCompositorThread(
  55       int routing_id,
  56       int input_handler_id,
  57       scoped_refptr<base::MessageLoopProxy> main_loop,
  58       const base::WeakPtr<RenderViewImpl>& render_view_impl);
  59
  60   class InputHandlerWrapper;
  61   friend class InputHandlerWrapper;
  62
  63   typedef std::map<int,  // routing_id
  64                    scoped_refptr<InputHandlerWrapper> > InputHandlerMap;
  65   InputHandlerMap input_handlers_;
  66
  67   webkit_glue::WebThreadImpl thread_;
  68   scoped_refptr<InputEventFilter> filter_;
  69 };
  70
  71 #endif  // CONTENT_RENDERER_GPU_COMPOSITOR_THREAD_H_