Add a gtk3 port of peerconnection_client on Linux

webrtc/examples/peerconnection/client/linux/main_wnd.h

 /*
  *  Copyright 2012 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_EXAMPLES_PEERCONNECTION_CLIENT_LINUX_MAIN_WND_H_
 #define WEBRTC_EXAMPLES_PEERCONNECTION_CLIENT_LINUX_MAIN_WND_H_
 
 #include <memory>
 #include <string>
 
 #include "webrtc/examples/peerconnection/client/main_wnd.h"
 #include "webrtc/examples/peerconnection/client/peer_connection_client.h"
 
 // Forward declarations.
 typedef struct _GtkWidget GtkWidget;
 typedef union _GdkEvent GdkEvent;
 typedef struct _GdkEventKey GdkEventKey;
 typedef struct _GtkTreeView GtkTreeView;
 typedef struct _GtkTreePath GtkTreePath;
 typedef struct _GtkTreeViewColumn GtkTreeViewColumn;
+typedef struct _cairo cairo_t;
 
 // Implements the main UI of the peer connection client.
 // This is functionally equivalent to the MainWnd class in the Windows
 // implementation.
 class GtkMainWnd : public MainWindow {
  public:
   GtkMainWnd(const char* server, int port, bool autoconnect, bool autocall);
   ~GtkMainWnd();
 
   virtual void RegisterObserver(MainWndCallback* callback);
@@ skipping 27 matching lines @@
   // Callback for keystrokes.  Used to capture Esc and Return.
   void OnKeyPress(GtkWidget* widget, GdkEventKey* key);
 
   // Callback when the user double clicks a peer in order to initiate a
   // connection.
   void OnRowActivated(GtkTreeView* tree_view, GtkTreePath* path,
                       GtkTreeViewColumn* column);
 
   void OnRedraw();
 
+  void Draw(GtkWidget* widget, cairo_t* cr);
+
  protected:
   class VideoRenderer : public rtc::VideoSinkInterface<webrtc::VideoFrame> {
    public:
     VideoRenderer(GtkMainWnd* main_wnd,
                   webrtc::VideoTrackInterface* track_to_render);
     virtual ~VideoRenderer();
 
     // VideoSinkInterface implementation
     void OnFrame(const webrtc::VideoFrame& frame) override;
 
@@ skipping 23 matching lines @@
   GtkWidget* server_edit_;
   GtkWidget* port_edit_;
   GtkWidget* peer_list_;  // The list of peers.
   MainWndCallback* callback_;
   std::string server_;
   std::string port_;
   bool autoconnect_;
   bool autocall_;
   std::unique_ptr<VideoRenderer> local_renderer_;
   std::unique_ptr<VideoRenderer> remote_renderer_;
+  int width_;
+  int height_;
   std::unique_ptr<uint8_t[]> draw_buffer_;
   int draw_buffer_size_;
 };
 
 #endif  // WEBRTC_EXAMPLES_PEERCONNECTION_CLIENT_LINUX_MAIN_WND_H_