Adds kind-of-live thumbnail generation for a potential tab switcher.

chrome/browser/renderer_host/render_widget_host_view_gtk.cc

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/browser/renderer_host/render_widget_host_view_gtk.h"
 
 #include <gtk/gtk.h>
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
 #include <gdk/gdkx.h>
@@ skipping 428 matching lines @@
   } else {
     gtk_widget_set_tooltip_text(view_.get(), WideToUTF8(tooltip_text).c_str());
   }
 }
 
 void RenderWidgetHostViewGtk::SelectionChanged(const std::string& text) {
   GtkClipboard* x_clipboard = gtk_clipboard_get(GDK_SELECTION_PRIMARY);
   gtk_clipboard_set_text(x_clipboard, text.c_str(), text.length());
 }
 
-BackingStore* RenderWidgetHostViewGtk::AllocBackingStore(
-    const gfx::Size& size) {
-  Display* display = x11_util::GetXDisplay();
-  void* visual = x11_util::GetVisualFromGtkWidget(view_.get());
-  XID root_window = x11_util::GetX11RootWindow();
-  bool use_render = x11_util::QueryRenderSupport(display);
-  bool use_shared_memory = x11_util::QuerySharedMemorySupport(display);
-  int depth = gtk_widget_get_visual(view_.get())->depth;
-
-  return new BackingStore(size, display, depth, visual, root_window,
-                          use_render, use_shared_memory);
-}
-
 void RenderWidgetHostViewGtk::PasteFromSelectionClipboard() {
   GtkClipboard* x_clipboard = gtk_clipboard_get(GDK_SELECTION_PRIMARY);
   gtk_clipboard_request_text(x_clipboard, ReceivedSelectionText, this);
 }
 
 void RenderWidgetHostViewGtk::ShowingContextMenu(bool showing) {
   is_showing_context_menu_ = showing;
   // Note that GTK_WIDGET_HAS_FOCUS differs gtom gtk_widget_is_focus() in that
   // the latter doesn't care whether the toplevel has focus.
   if (!showing && !GTK_WIDGET_HAS_FOCUS(view_.get()))
     GetRenderWidgetHost()->Blur();
 }
 
+BackingStore* RenderWidgetHostViewGtk::AllocBackingStore(
+    const gfx::Size& size) {
+  return new BackingStore(host_, size,
+                          x11_util::GetVisualFromGtkWidget(view_.get()),
+                          gtk_widget_get_visual(view_.get())->depth);
+}
+
 void RenderWidgetHostViewGtk::Paint(const gfx::Rect& damage_rect) {
   DCHECK(!about_to_validate_and_paint_);
 
   invalid_rect_ = damage_rect;
   about_to_validate_and_paint_ = true;
-  BackingStore* backing_store = host_->GetBackingStore();
+  BackingStore* backing_store = host_->GetBackingStore(true);
   // Calling GetBackingStore maybe have changed |invalid_rect_|...
   about_to_validate_and_paint_ = false;
 
   GdkWindow* window = view_.get()->window;
   if (backing_store) {
     // Only render the widget if it is attached to a window; there's a short
     // period where this object isn't attached to a window but hasn't been
     // Destroy()ed yet and it receives paint messages...
     if (window) {
       backing_store->ShowRect(
@@ skipping 50 matching lines @@
 void RenderWidgetHostViewGtk::ReceivedSelectionText(GtkClipboard* clipboard,
     const gchar* text, gpointer userdata) {
   // If there's nothing to paste (|text| is NULL), do nothing.
   if (!text)
     return;
   RenderWidgetHostViewGtk* host_view =
       reinterpret_cast<RenderWidgetHostViewGtk*>(userdata);
   host_view->host_->Send(new ViewMsg_InsertText(host_view->host_->routing_id(),
                                                 UTF8ToUTF16(text)));
 }