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ui/aura/root_window_host_linux.cc

 // Copyright (c) 2012 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 "ui/aura/root_window_host_linux.h"
 
 #include <X11/cursorfont.h>
 #include <X11/extensions/Xfixes.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/extensions/Xrandr.h>
@@ skipping 730 matching lines @@
 }
 
 void RootWindowHostLinux::SetBounds(const gfx::Rect& bounds) {
   // Even if the host window's size doesn't change, aura's root window
   // size, which is in DIP, changes when the scale changes.
   float current_scale = delegate_->GetDeviceScaleFactor();
   float new_scale = gfx::Screen::GetDisplayNearestWindow(
       delegate_->AsRootWindow()).device_scale_factor();
   bool size_changed = bounds_.size() != bounds.size() ||
       current_scale != new_scale;
+  XWindowChanges changes = {0};
+  unsigned value_mask = 0;
 
-  if (bounds.size() != bounds_.size())
-    XResizeWindow(xdisplay_, xwindow_, bounds.width(), bounds.height());
+  if (bounds.size() != bounds_.size()) {
+    changes.width = bounds.width();
+    changes.height = bounds.height();
+    value_mask = CWHeight | CWWidth;
+  }
 
-  if (bounds.origin() != bounds_.origin())
-    XMoveWindow(xdisplay_, xwindow_, bounds.x(), bounds.y());
+  if (bounds.origin() != bounds_.origin()) {
+    changes.x = bounds.x();
+    changes.y = bounds.y();
+    value_mask |= CWX | CWY;
+  }
+  if (value_mask)
+    XConfigureWindow(xdisplay_, xwindow_, value_mask, &changes);
 
   // Assume that the resize will go through as requested, which should be the
   // case if we're running without a window manager.  If there's a window
   // manager, it can modify or ignore the request, but (per ICCCM) we'll get a
   // (possibly synthetic) ConfigureNotify about the actual size and correct
   // |bounds_| later.
   bounds_ = bounds;
   if (size_changed) {
     delegate_->OnHostResized(bounds.size());
   } else {
@@ skipping 222 matching lines @@
       ui::ViewProp::GetValue(accelerated_widget, kRootWindowHostLinuxKey));
 }
 
 // static
 gfx::Size RootWindowHost::GetNativeScreenSize() {
   ::Display* xdisplay = base::MessagePumpAuraX11::GetDefaultXDisplay();
   return gfx::Size(DisplayWidth(xdisplay, 0), DisplayHeight(xdisplay, 0));
 }
 
 }  // namespace aura