DesktopRect::UnionWith() to extend current rect to cover the input rect

webrtc/modules/desktop_capture/mac/desktop_configuration.mm

 /*
  *  Copyright (c) 2013 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.
  */
 
@@ skipping 18 matching lines @@
 namespace {
 
 DesktopRect NSRectToDesktopRect(const NSRect& ns_rect) {
   return DesktopRect::MakeLTRB(
       static_cast<int>(floor(ns_rect.origin.x)),
       static_cast<int>(floor(ns_rect.origin.y)),
       static_cast<int>(ceil(ns_rect.origin.x + ns_rect.size.width)),
       static_cast<int>(ceil(ns_rect.origin.y + ns_rect.size.height)));
 }
 
-DesktopRect JoinRects(const DesktopRect& a,
-                              const DesktopRect& b) {
-  return DesktopRect::MakeLTRB(
-      std::min(a.left(), b.left()),
-      std::min(a.top(), b.top()),
-      std::max(a.right(), b.right()),
-      std::max(a.bottom(), b.bottom()));
-}
-
 // Inverts the position of |rect| from bottom-up coordinates to top-down,
 // relative to |bounds|.
 void InvertRectYOrigin(const DesktopRect& bounds,
                        DesktopRect* rect) {
   assert(bounds.top() == 0);
   *rect = DesktopRect::MakeXYWH(
       rect->left(), bounds.bottom() - rect->bottom(),
       rect->width(), rect->height());
 }
 
@@ skipping 83 matching lines @@
       InvertRectYOrigin(primary_bounds, &display_config.pixel_bounds);
     }
 
     // Add the display to the configuration.
     desktop_config.displays.push_back(display_config);
 
     // Update the desktop bounds to account for this display, unless the current
     // display uses different DPI settings.
     if (display_config.dip_to_pixel_scale ==
         desktop_config.dip_to_pixel_scale) {
-      desktop_config.bounds =
-          JoinRects(desktop_config.bounds, display_config.bounds);
-      desktop_config.pixel_bounds =
-          JoinRects(desktop_config.pixel_bounds, display_config.pixel_bounds);
+      desktop_config.bounds.UnionWith(display_config.bounds);
+      desktop_config.pixel_bounds.UnionWith(display_config.pixel_bounds);
     }
   }
 
   return desktop_config;
 }
 
 // For convenience of comparing MacDisplayConfigurations in
 // MacDesktopConfiguration::Equals.
 bool operator==(const MacDisplayConfiguration& left,
                 const MacDisplayConfiguration& right) {
@@ skipping 16 matching lines @@
     CGDirectDisplayID id) {
   for (MacDisplayConfigurations::const_iterator it = displays.begin();
       it != displays.end(); ++it) {
     if (it->id == id)
       return &(*it);
   }
   return NULL;
 }
 
 }  // namespace webrtc