peerconnection/samples/client/linux/main_wnd.cc - vendor/opensource/webrtc - Git at Google

 /*
  *  Copyright (c) 2011 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.
  */


 #include "peerconnection/samples/client/linux/main_wnd.h"

 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
 #include <stddef.h>

 #include "peerconnection/samples/client/defaults.h"
 #include "talk/base/common.h"
 #include "talk/base/logging.h"
 #include "talk/base/stringutils.h"

 using talk_base::sprintfn;

 namespace {

 //
 // Simple static functions that simply forward the callback to the
 // GtkMainWnd instance.
 //

 gboolean OnDestroyedCallback(GtkWidget* widget, GdkEvent* event,
                              gpointer data) {
   reinterpret_cast<GtkMainWnd*>(data)->OnDestroyed(widget, event);
   return FALSE;
 }

 void OnClickedCallback(GtkWidget* widget, gpointer data) {
   reinterpret_cast<GtkMainWnd*>(data)->OnClicked(widget);
 }

 gboolean OnKeyPressCallback(GtkWidget* widget, GdkEventKey* key,
                             gpointer data) {
   reinterpret_cast<GtkMainWnd*>(data)->OnKeyPress(widget, key);
   return false;
 }

 void OnRowActivatedCallback(GtkTreeView* tree_view, GtkTreePath* path,
                             GtkTreeViewColumn* column, gpointer data) {
   reinterpret_cast<GtkMainWnd*>(data)->OnRowActivated(tree_view, path, column);
 }

 // Creates a tree view, that we use to display the list of peers.
 void InitializeList(GtkWidget* list) {
   GtkCellRenderer* renderer = gtk_cell_renderer_text_new();
   GtkTreeViewColumn* column = gtk_tree_view_column_new_with_attributes(
       "List Items", renderer, "text", 0, NULL);
   gtk_tree_view_append_column(GTK_TREE_VIEW(list), column);
   GtkListStore* store = gtk_list_store_new(2, G_TYPE_STRING, G_TYPE_INT);
   gtk_tree_view_set_model(GTK_TREE_VIEW(list), GTK_TREE_MODEL(store));
   g_object_unref(store);
 }

 // Adds an entry to a tree view.
 void AddToList(GtkWidget* list, const gchar* str, int value) {
   GtkListStore* store = GTK_LIST_STORE(
       gtk_tree_view_get_model(GTK_TREE_VIEW(list)));

   GtkTreeIter iter;
   gtk_list_store_append(store, &iter);
   gtk_list_store_set(store, &iter, 0, str, 1, value, -1);
 }

 struct UIThreadCallbackData {
   explicit UIThreadCallbackData(MainWndCallback* cb, int id, void* d)
       : callback(cb), msg_id(id), data(d) {}
   MainWndCallback* callback;
   int msg_id;
   void* data;
 };

 gboolean HandleUIThreadCallback(gpointer data) {
   UIThreadCallbackData* cb_data = reinterpret_cast<UIThreadCallbackData*>(data);
   cb_data->callback->UIThreadCallback(cb_data->msg_id, cb_data->data);
   delete cb_data;
   return false;
 }

 gboolean Redraw(gpointer data) {
   GtkMainWnd* wnd = reinterpret_cast<GtkMainWnd*>(data);
   wnd->OnRedraw();
   return false;
 }
 }  // end anonymous

 //
 // GtkMainWnd implementation.
 //

 GtkMainWnd::GtkMainWnd()
     : window_(NULL), draw_area_(NULL), vbox_(NULL), server_edit_(NULL),
       port_edit_(NULL), peer_list_(NULL), callback_(NULL),
       server_("localhost") {
   char buffer[10];
   sprintfn(buffer, sizeof(buffer), "%i", kDefaultServerPort);
   port_ = buffer;
 }

 GtkMainWnd::~GtkMainWnd() {
   ASSERT(!IsWindow());
 }

 void GtkMainWnd::RegisterObserver(MainWndCallback* callback) {
   callback_ = callback;
 }

 bool GtkMainWnd::IsWindow() {
   return window_ != NULL && GTK_IS_WINDOW(window_);
 }

 void GtkMainWnd::MessageBox(const char* caption, const char* text,
                             bool is_error) {
   GtkWidget* dialog = gtk_message_dialog_new(GTK_WINDOW(window_),
       GTK_DIALOG_DESTROY_WITH_PARENT,
       is_error ? GTK_MESSAGE_ERROR : GTK_MESSAGE_INFO,
       GTK_BUTTONS_CLOSE, "%s", text);
   gtk_window_set_title(GTK_WINDOW(dialog), caption);
   gtk_dialog_run(GTK_DIALOG(dialog));
   gtk_widget_destroy(dialog);
 }

 MainWindow::UI GtkMainWnd::current_ui() {
   if (vbox_)
     return CONNECT_TO_SERVER;

   if (peer_list_)
     return LIST_PEERS;

   return STREAMING;
 }

 cricket::VideoRenderer* GtkMainWnd::local_renderer() {
   if (!local_renderer_.get())
     local_renderer_.reset(new VideoRenderer(this));
   return local_renderer_.get();
 }

 cricket::VideoRenderer* GtkMainWnd::remote_renderer() {
   if (!remote_renderer_.get())
     remote_renderer_.reset(new VideoRenderer(this));
   return remote_renderer_.get();
 }

 void GtkMainWnd::QueueUIThreadCallback(int msg_id, void* data) {
   g_idle_add(HandleUIThreadCallback,
              new UIThreadCallbackData(callback_, msg_id, data));
 }

 bool GtkMainWnd::Create() {
   ASSERT(window_ == NULL);

   window_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
   if (window_) {
     gtk_window_set_position(GTK_WINDOW(window_), GTK_WIN_POS_CENTER);
     gtk_window_set_default_size(GTK_WINDOW(window_), 640, 480);
     gtk_window_set_title(GTK_WINDOW(window_), "PeerConnection client");
     g_signal_connect(G_OBJECT(window_), "delete-event",
                      G_CALLBACK(&OnDestroyedCallback), this);
     g_signal_connect(window_, "key-press-event", G_CALLBACK(OnKeyPressCallback),
                      this);

     SwitchToConnectUI();
   }

   return window_ != NULL;
 }

 bool GtkMainWnd::Destroy() {
   if (!IsWindow())
     return false;

   gtk_widget_destroy(window_);
   window_ = NULL;

   return true;
 }

 void GtkMainWnd::SwitchToConnectUI() {
   LOG(INFO) << __FUNCTION__;

   ASSERT(IsWindow());
   ASSERT(vbox_ == NULL);

   gtk_container_set_border_width(GTK_CONTAINER(window_), 10);

   if (peer_list_) {
     gtk_widget_destroy(peer_list_);
     peer_list_ = NULL;
   }

   vbox_ = gtk_vbox_new(FALSE, 5);
   GtkWidget* valign = gtk_alignment_new(0, 1, 0, 0);
   gtk_container_add(GTK_CONTAINER(vbox_), valign);
   gtk_container_add(GTK_CONTAINER(window_), vbox_);

   GtkWidget* hbox = gtk_hbox_new(FALSE, 5);

   GtkWidget* label = gtk_label_new("Server");
   gtk_container_add(GTK_CONTAINER(hbox), label);

   server_edit_ = gtk_entry_new();
   gtk_entry_set_text(GTK_ENTRY(server_edit_), server_.c_str());
   gtk_widget_set_size_request(server_edit_, 400, 30);
   gtk_container_add(GTK_CONTAINER(hbox), server_edit_);

   port_edit_ = gtk_entry_new();
   gtk_entry_set_text(GTK_ENTRY(port_edit_), port_.c_str());
   gtk_widget_set_size_request(port_edit_, 70, 30);
   gtk_container_add(GTK_CONTAINER(hbox), port_edit_);

   GtkWidget* button = gtk_button_new_with_label("Connect");
   gtk_widget_set_size_request(button, 70, 30);
   g_signal_connect(button, "clicked", G_CALLBACK(OnClickedCallback), this);
   gtk_container_add(GTK_CONTAINER(hbox), button);

   GtkWidget* halign = gtk_alignment_new(1, 0, 0, 0);
   gtk_container_add(GTK_CONTAINER(halign), hbox);
   gtk_box_pack_start(GTK_BOX(vbox_), halign, FALSE, FALSE, 0);

   gtk_widget_show_all(window_);
 }

 void GtkMainWnd::SwitchToPeerList(const Peers& peers) {
   LOG(INFO) << __FUNCTION__;

   // Clean up buffers from a potential previous session.
   local_renderer_.reset();
   remote_renderer_.reset();

   if (!peer_list_) {
     gtk_container_set_border_width(GTK_CONTAINER(window_), 0);
     if (vbox_) {
       gtk_widget_destroy(vbox_);
       vbox_ = NULL;
       server_edit_ = NULL;
       port_edit_ = NULL;
     } else if (draw_area_) {
       gtk_widget_destroy(draw_area_);
       draw_area_ = NULL;
       draw_buffer_.reset();
     }

     peer_list_ = gtk_tree_view_new();
     g_signal_connect(peer_list_, "row-activated",
                      G_CALLBACK(OnRowActivatedCallback), this);
     gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(peer_list_), FALSE);
     InitializeList(peer_list_);
     gtk_container_add(GTK_CONTAINER(window_), peer_list_);
     gtk_widget_show_all(window_);
   } else {
     GtkListStore* store =
         GTK_LIST_STORE(gtk_tree_view_get_model(GTK_TREE_VIEW(peer_list_)));
     gtk_list_store_clear(store);
   }

   AddToList(peer_list_, "List of currently connected peers:", -1);
   for (Peers::const_iterator i = peers.begin(); i != peers.end(); ++i)
     AddToList(peer_list_, i->second.c_str(), i->first);
 }

 void GtkMainWnd::SwitchToStreamingUI() {
   LOG(INFO) << __FUNCTION__;

   ASSERT(draw_area_ == NULL);

   gtk_container_set_border_width(GTK_CONTAINER(window_), 0);
   if (peer_list_) {
     gtk_widget_destroy(peer_list_);
     peer_list_ = NULL;
   }

   draw_area_ = gtk_drawing_area_new();
   gtk_container_add(GTK_CONTAINER(window_), draw_area_);

   gtk_widget_show_all(window_);
 }

 void GtkMainWnd::OnDestroyed(GtkWidget* widget, GdkEvent* event) {
   callback_->Close();
   window_ = NULL;
   draw_area_ = NULL;
   vbox_ = NULL;
   server_edit_ = NULL;
   port_edit_ = NULL;
   peer_list_ = NULL;
 }

 void GtkMainWnd::OnClicked(GtkWidget* widget) {
   server_ = gtk_entry_get_text(GTK_ENTRY(server_edit_));
   port_ = gtk_entry_get_text(GTK_ENTRY(port_edit_));
   int port = port_.length() ? atoi(port_.c_str()) : 0;
   callback_->StartLogin(server_, port);
 }

 void GtkMainWnd::OnKeyPress(GtkWidget* widget, GdkEventKey* key) {
   if (key->type == GDK_KEY_PRESS) {
     switch (key->keyval) {
      case GDK_Escape:
        if (draw_area_) {
          callback_->DisconnectFromCurrentPeer();
        } else if (peer_list_) {
          callback_->DisconnectFromServer();
        }
        break;

      case GDK_KP_Enter:
      case GDK_Return:
        if (vbox_) {
          OnClicked(NULL);
        } else if (peer_list_) {
          // OnRowActivated will be called automatically when the user
          // presses enter.
        }
        break;

      default:
        break;
     }
   }
 }

 void GtkMainWnd::OnRowActivated(GtkTreeView* tree_view, GtkTreePath* path,
                                 GtkTreeViewColumn* column) {
   ASSERT(peer_list_ != NULL);
   GtkTreeIter iter;
   GtkTreeModel* model;
   GtkTreeSelection* selection =
       gtk_tree_view_get_selection(GTK_TREE_VIEW(tree_view));
   if (gtk_tree_selection_get_selected(selection, &model, &iter)) {
      char* text;
      int id = -1;
      gtk_tree_model_get(model, &iter, 0, &text, 1, &id,  -1);
      if (id != -1)
        callback_->ConnectToPeer(id);
      g_free(text);
   }
 }

 void GtkMainWnd::OnRedraw() {
   gdk_threads_enter();

   if (remote_renderer_.get() && remote_renderer_->image() != NULL &&
       draw_area_ != NULL) {
     int width = remote_renderer_->width();
     int height = remote_renderer_->height();

     if (!draw_buffer_.get()) {
       draw_buffer_size_ = (width * height * 4) * 4;
       draw_buffer_.reset(new uint8[draw_buffer_size_]);
       gtk_widget_set_size_request(draw_area_, width * 2, height * 2);
     }

     const uint32* image = reinterpret_cast<const uint32*>(
         remote_renderer_->image());
     uint32* scaled = reinterpret_cast<uint32*>(draw_buffer_.get());
     for (int r = 0; r < height; ++r) {
       for (int c = 0; c < width; ++c) {
         int x = c * 2;
         scaled[x] = scaled[x + 1] = image[c];
       }

       uint32* prev_line = scaled;
       scaled += width * 2;
       memcpy(scaled, prev_line, (width * 2) * 4);

       image += width;
       scaled += width * 2;
     }

     if (local_renderer_.get() && local_renderer_->image()) {
       image = reinterpret_cast<const uint32*>(local_renderer_->image());
       scaled = reinterpret_cast<uint32*>(draw_buffer_.get());
       // Position the local preview on the right side.
       scaled += (width * 2) - (local_renderer_->width() / 2);
       // right margin...
       scaled -= 10;
       // ... towards the bottom.
       scaled += (height * width * 4) -
                 ((local_renderer_->height() / 2) *
                  (local_renderer_->width() / 2) * 4);
       // bottom margin...
       scaled -= (width * 2) * 5;
       for (int r = 0; r < local_renderer_->height(); r += 2) {
         for (int c = 0; c < local_renderer_->width(); c += 2) {
           scaled[c / 2] = image[c + r * local_renderer_->width()];
         }
         scaled += width * 2;
       }
     }

     gdk_draw_rgb_32_image(draw_area_->window,
                           draw_area_->style->fg_gc[GTK_STATE_NORMAL],
                           0,
                           0,
                           width * 2,
                           height * 2,
                           GDK_RGB_DITHER_MAX,
                           draw_buffer_.get(),
                           (width * 2) * 4);
   }

   gdk_threads_leave();
 }

 GtkMainWnd::VideoRenderer::VideoRenderer(GtkMainWnd* main_wnd)
     : width_(0), height_(0), main_wnd_(main_wnd) {
 }

 GtkMainWnd::VideoRenderer::~VideoRenderer() {
 }

 bool GtkMainWnd::VideoRenderer::SetSize(int width, int height, int reserved) {
   gdk_threads_enter();
   width_ = width;
   height_ = height;
   image_.reset(new uint8[width * height * 4]);
   gdk_threads_leave();
   return true;
 }

 bool GtkMainWnd::VideoRenderer::RenderFrame(const cricket::VideoFrame* frame) {
   gdk_threads_enter();

   int size = width_ * height_ * 4;
   frame->ConvertToRgbBuffer(cricket::FOURCC_ARGB,
                             image_.get(),
                             size,
                             width_ * 4);
   // Convert the B,G,R,A frame to R,G,B,A, which is accepted by GTK.
   // The 'A' is just padding for GTK, so we can use it as temp.
   uint8* pix = image_.get();
   uint8* end = image_.get() + size;
   while (pix < end) {
     pix[3] = pix[0];     // Save B to A.
     pix[0] = pix[2];  // Set Red.
     pix[2] = pix[3];  // Set Blue.
     pix[3] = 0xFF;     // Fixed Alpha.
     pix += 4;
   }

   gdk_threads_leave();

   g_idle_add(Redraw, main_wnd_);

   return true;
 }
	/*
	* Copyright (c) 2011 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.
	*/


	#include "peerconnection/samples/client/linux/main_wnd.h"

	#include <gdk/gdkkeysyms.h>
	#include <gtk/gtk.h>
	#include <stddef.h>

	#include "peerconnection/samples/client/defaults.h"
	#include "talk/base/common.h"
	#include "talk/base/logging.h"
	#include "talk/base/stringutils.h"

	using talk_base::sprintfn;

	namespace {

	//
	// Simple static functions that simply forward the callback to the
	// GtkMainWnd instance.
	//

	gboolean OnDestroyedCallback(GtkWidget* widget, GdkEvent* event,
	gpointer data) {
	reinterpret_cast<GtkMainWnd*>(data)->OnDestroyed(widget, event);
	return FALSE;
	}

	void OnClickedCallback(GtkWidget* widget, gpointer data) {
	reinterpret_cast<GtkMainWnd*>(data)->OnClicked(widget);
	}

	gboolean OnKeyPressCallback(GtkWidget* widget, GdkEventKey* key,
	gpointer data) {
	reinterpret_cast<GtkMainWnd*>(data)->OnKeyPress(widget, key);
	return false;
	}

	void OnRowActivatedCallback(GtkTreeView* tree_view, GtkTreePath* path,
	GtkTreeViewColumn* column, gpointer data) {
	reinterpret_cast<GtkMainWnd*>(data)->OnRowActivated(tree_view, path, column);
	}

	// Creates a tree view, that we use to display the list of peers.
	void InitializeList(GtkWidget* list) {
	GtkCellRenderer* renderer = gtk_cell_renderer_text_new();
	GtkTreeViewColumn* column = gtk_tree_view_column_new_with_attributes(
	"List Items", renderer, "text", 0, NULL);
	gtk_tree_view_append_column(GTK_TREE_VIEW(list), column);
	GtkListStore* store = gtk_list_store_new(2, G_TYPE_STRING, G_TYPE_INT);
	gtk_tree_view_set_model(GTK_TREE_VIEW(list), GTK_TREE_MODEL(store));
	g_object_unref(store);
	}

	// Adds an entry to a tree view.
	void AddToList(GtkWidget* list, const gchar* str, int value) {
	GtkListStore* store = GTK_LIST_STORE(
	gtk_tree_view_get_model(GTK_TREE_VIEW(list)));

	GtkTreeIter iter;
	gtk_list_store_append(store, &iter);
	gtk_list_store_set(store, &iter, 0, str, 1, value, -1);
	}

	struct UIThreadCallbackData {
	explicit UIThreadCallbackData(MainWndCallback* cb, int id, void* d)
	: callback(cb), msg_id(id), data(d) {}
	MainWndCallback* callback;
	int msg_id;
	void* data;
	};

	gboolean HandleUIThreadCallback(gpointer data) {
	UIThreadCallbackData* cb_data = reinterpret_cast<UIThreadCallbackData*>(data);
	cb_data->callback->UIThreadCallback(cb_data->msg_id, cb_data->data);
	delete cb_data;
	return false;
	}

	gboolean Redraw(gpointer data) {
	GtkMainWnd* wnd = reinterpret_cast<GtkMainWnd*>(data);
	wnd->OnRedraw();
	return false;
	}
	} // end anonymous

	//
	// GtkMainWnd implementation.
	//

	GtkMainWnd::GtkMainWnd()
	: window_(NULL), draw_area_(NULL), vbox_(NULL), server_edit_(NULL),
	port_edit_(NULL), peer_list_(NULL), callback_(NULL),
	server_("localhost") {
	char buffer[10];
	sprintfn(buffer, sizeof(buffer), "%i", kDefaultServerPort);
	port_ = buffer;
	}

	GtkMainWnd::~GtkMainWnd() {
	ASSERT(!IsWindow());
	}

	void GtkMainWnd::RegisterObserver(MainWndCallback* callback) {
	callback_ = callback;
	}

	bool GtkMainWnd::IsWindow() {
	return window_ != NULL && GTK_IS_WINDOW(window_);
	}

	void GtkMainWnd::MessageBox(const char* caption, const char* text,
	bool is_error) {
	GtkWidget* dialog = gtk_message_dialog_new(GTK_WINDOW(window_),
	GTK_DIALOG_DESTROY_WITH_PARENT,
	is_error ? GTK_MESSAGE_ERROR : GTK_MESSAGE_INFO,
	GTK_BUTTONS_CLOSE, "%s", text);
	gtk_window_set_title(GTK_WINDOW(dialog), caption);
	gtk_dialog_run(GTK_DIALOG(dialog));
	gtk_widget_destroy(dialog);
	}

	MainWindow::UI GtkMainWnd::current_ui() {
	if (vbox_)
	return CONNECT_TO_SERVER;

	if (peer_list_)
	return LIST_PEERS;

	return STREAMING;
	}

	cricket::VideoRenderer* GtkMainWnd::local_renderer() {
	if (!local_renderer_.get())
	local_renderer_.reset(new VideoRenderer(this));
	return local_renderer_.get();
	}

	cricket::VideoRenderer* GtkMainWnd::remote_renderer() {
	if (!remote_renderer_.get())
	remote_renderer_.reset(new VideoRenderer(this));
	return remote_renderer_.get();
	}

	void GtkMainWnd::QueueUIThreadCallback(int msg_id, void* data) {
	g_idle_add(HandleUIThreadCallback,
	new UIThreadCallbackData(callback_, msg_id, data));
	}

	bool GtkMainWnd::Create() {
	ASSERT(window_ == NULL);

	window_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
	if (window_) {
	gtk_window_set_position(GTK_WINDOW(window_), GTK_WIN_POS_CENTER);
	gtk_window_set_default_size(GTK_WINDOW(window_), 640, 480);
	gtk_window_set_title(GTK_WINDOW(window_), "PeerConnection client");
	g_signal_connect(G_OBJECT(window_), "delete-event",
	G_CALLBACK(&OnDestroyedCallback), this);
	g_signal_connect(window_, "key-press-event", G_CALLBACK(OnKeyPressCallback),
	this);

	SwitchToConnectUI();
	}

	return window_ != NULL;
	}

	bool GtkMainWnd::Destroy() {
	if (!IsWindow())
	return false;

	gtk_widget_destroy(window_);
	window_ = NULL;

	return true;
	}

	void GtkMainWnd::SwitchToConnectUI() {
	LOG(INFO) << __FUNCTION__;

	ASSERT(IsWindow());
	ASSERT(vbox_ == NULL);

	gtk_container_set_border_width(GTK_CONTAINER(window_), 10);

	if (peer_list_) {
	gtk_widget_destroy(peer_list_);
	peer_list_ = NULL;
	}

	vbox_ = gtk_vbox_new(FALSE, 5);
	GtkWidget* valign = gtk_alignment_new(0, 1, 0, 0);
	gtk_container_add(GTK_CONTAINER(vbox_), valign);
	gtk_container_add(GTK_CONTAINER(window_), vbox_);

	GtkWidget* hbox = gtk_hbox_new(FALSE, 5);

	GtkWidget* label = gtk_label_new("Server");
	gtk_container_add(GTK_CONTAINER(hbox), label);

	server_edit_ = gtk_entry_new();
	gtk_entry_set_text(GTK_ENTRY(server_edit_), server_.c_str());
	gtk_widget_set_size_request(server_edit_, 400, 30);
	gtk_container_add(GTK_CONTAINER(hbox), server_edit_);

	port_edit_ = gtk_entry_new();
	gtk_entry_set_text(GTK_ENTRY(port_edit_), port_.c_str());
	gtk_widget_set_size_request(port_edit_, 70, 30);
	gtk_container_add(GTK_CONTAINER(hbox), port_edit_);

	GtkWidget* button = gtk_button_new_with_label("Connect");
	gtk_widget_set_size_request(button, 70, 30);
	g_signal_connect(button, "clicked", G_CALLBACK(OnClickedCallback), this);
	gtk_container_add(GTK_CONTAINER(hbox), button);

	GtkWidget* halign = gtk_alignment_new(1, 0, 0, 0);
	gtk_container_add(GTK_CONTAINER(halign), hbox);
	gtk_box_pack_start(GTK_BOX(vbox_), halign, FALSE, FALSE, 0);

	gtk_widget_show_all(window_);
	}

	void GtkMainWnd::SwitchToPeerList(const Peers& peers) {
	LOG(INFO) << __FUNCTION__;

	// Clean up buffers from a potential previous session.
	local_renderer_.reset();
	remote_renderer_.reset();

	if (!peer_list_) {
	gtk_container_set_border_width(GTK_CONTAINER(window_), 0);
	if (vbox_) {
	gtk_widget_destroy(vbox_);
	vbox_ = NULL;
	server_edit_ = NULL;
	port_edit_ = NULL;
	} else if (draw_area_) {
	gtk_widget_destroy(draw_area_);
	draw_area_ = NULL;
	draw_buffer_.reset();
	}

	peer_list_ = gtk_tree_view_new();
	g_signal_connect(peer_list_, "row-activated",
	G_CALLBACK(OnRowActivatedCallback), this);
	gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(peer_list_), FALSE);
	InitializeList(peer_list_);
	gtk_container_add(GTK_CONTAINER(window_), peer_list_);
	gtk_widget_show_all(window_);
	} else {
	GtkListStore* store =
	GTK_LIST_STORE(gtk_tree_view_get_model(GTK_TREE_VIEW(peer_list_)));
	gtk_list_store_clear(store);
	}

	AddToList(peer_list_, "List of currently connected peers:", -1);
	for (Peers::const_iterator i = peers.begin(); i != peers.end(); ++i)
	AddToList(peer_list_, i->second.c_str(), i->first);
	}

	void GtkMainWnd::SwitchToStreamingUI() {
	LOG(INFO) << __FUNCTION__;

	ASSERT(draw_area_ == NULL);

	gtk_container_set_border_width(GTK_CONTAINER(window_), 0);
	if (peer_list_) {
	gtk_widget_destroy(peer_list_);
	peer_list_ = NULL;
	}

	draw_area_ = gtk_drawing_area_new();
	gtk_container_add(GTK_CONTAINER(window_), draw_area_);

	gtk_widget_show_all(window_);
	}

	void GtkMainWnd::OnDestroyed(GtkWidget* widget, GdkEvent* event) {
	callback_->Close();
	window_ = NULL;
	draw_area_ = NULL;
	vbox_ = NULL;
	server_edit_ = NULL;
	port_edit_ = NULL;
	peer_list_ = NULL;
	}

	void GtkMainWnd::OnClicked(GtkWidget* widget) {
	server_ = gtk_entry_get_text(GTK_ENTRY(server_edit_));
	port_ = gtk_entry_get_text(GTK_ENTRY(port_edit_));
	int port = port_.length() ? atoi(port_.c_str()) : 0;
	callback_->StartLogin(server_, port);
	}

	void GtkMainWnd::OnKeyPress(GtkWidget* widget, GdkEventKey* key) {
	if (key->type == GDK_KEY_PRESS) {
	switch (key->keyval) {
	case GDK_Escape:
	if (draw_area_) {
	callback_->DisconnectFromCurrentPeer();
	} else if (peer_list_) {
	callback_->DisconnectFromServer();
	}
	break;

	case GDK_KP_Enter:
	case GDK_Return:
	if (vbox_) {
	OnClicked(NULL);
	} else if (peer_list_) {
	// OnRowActivated will be called automatically when the user
	// presses enter.
	}
	break;

	default:
	break;
	}
	}
	}

	void GtkMainWnd::OnRowActivated(GtkTreeView* tree_view, GtkTreePath* path,
	GtkTreeViewColumn* column) {
	ASSERT(peer_list_ != NULL);
	GtkTreeIter iter;
	GtkTreeModel* model;
	GtkTreeSelection* selection =
	gtk_tree_view_get_selection(GTK_TREE_VIEW(tree_view));
	if (gtk_tree_selection_get_selected(selection, &model, &iter)) {
	char* text;
	int id = -1;
	gtk_tree_model_get(model, &iter, 0, &text, 1, &id, -1);
	if (id != -1)
	callback_->ConnectToPeer(id);
	g_free(text);
	}
	}

	void GtkMainWnd::OnRedraw() {
	gdk_threads_enter();

	if (remote_renderer_.get() && remote_renderer_->image() != NULL &&
	draw_area_ != NULL) {
	int width = remote_renderer_->width();
	int height = remote_renderer_->height();

	if (!draw_buffer_.get()) {
	draw_buffer_size_ = (width * height * 4) * 4;
	draw_buffer_.reset(new uint8[draw_buffer_size_]);
	gtk_widget_set_size_request(draw_area_, width * 2, height * 2);
	}

	const uint32* image = reinterpret_cast<const uint32*>(
	remote_renderer_->image());
	uint32* scaled = reinterpret_cast<uint32*>(draw_buffer_.get());
	for (int r = 0; r < height; ++r) {
	for (int c = 0; c < width; ++c) {
	int x = c * 2;
	scaled[x] = scaled[x + 1] = image[c];
	}

	uint32* prev_line = scaled;
	scaled += width * 2;
	memcpy(scaled, prev_line, (width * 2) * 4);

	image += width;
	scaled += width * 2;
	}

	if (local_renderer_.get() && local_renderer_->image()) {
	image = reinterpret_cast<const uint32*>(local_renderer_->image());
	scaled = reinterpret_cast<uint32*>(draw_buffer_.get());
	// Position the local preview on the right side.
	scaled += (width * 2) - (local_renderer_->width() / 2);
	// right margin...
	scaled -= 10;
	// ... towards the bottom.
	scaled += (height * width * 4) -
	((local_renderer_->height() / 2) *
	(local_renderer_->width() / 2) * 4);
	// bottom margin...
	scaled -= (width * 2) * 5;
	for (int r = 0; r < local_renderer_->height(); r += 2) {
	for (int c = 0; c < local_renderer_->width(); c += 2) {
	scaled[c / 2] = image[c + r * local_renderer_->width()];
	}
	scaled += width * 2;
	}
	}

	gdk_draw_rgb_32_image(draw_area_->window,
	draw_area_->style->fg_gc[GTK_STATE_NORMAL],
	0,
	0,
	width * 2,
	height * 2,
	GDK_RGB_DITHER_MAX,
	draw_buffer_.get(),
	(width * 2) * 4);
	}

	gdk_threads_leave();
	}

	GtkMainWnd::VideoRenderer::VideoRenderer(GtkMainWnd* main_wnd)
	: width_(0), height_(0), main_wnd_(main_wnd) {
	}

	GtkMainWnd::VideoRenderer::~VideoRenderer() {
	}

	bool GtkMainWnd::VideoRenderer::SetSize(int width, int height, int reserved) {
	gdk_threads_enter();
	width_ = width;
	height_ = height;
	image_.reset(new uint8[width * height * 4]);
	gdk_threads_leave();
	return true;
	}

	bool GtkMainWnd::VideoRenderer::RenderFrame(const cricket::VideoFrame* frame) {
	gdk_threads_enter();

	int size = width_ * height_ * 4;
	frame->ConvertToRgbBuffer(cricket::FOURCC_ARGB,
	image_.get(),
	size,
	width_ * 4);
	// Convert the B,G,R,A frame to R,G,B,A, which is accepted by GTK.
	// The 'A' is just padding for GTK, so we can use it as temp.
	uint8* pix = image_.get();
	uint8* end = image_.get() + size;
	while (pix < end) {
	pix[3] = pix[0]; // Save B to A.
	pix[0] = pix[2]; // Set Red.
	pix[2] = pix[3]; // Set Blue.
	pix[3] = 0xFF; // Fixed Alpha.
	pix += 4;
	}

	gdk_threads_leave();

	g_idle_add(Redraw, main_wnd_);

	return true;
	}