Add occlusion support to WebContentsImpl and RenderWidgetHostView

content/browser/web_contents/web_contents_impl.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 "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 907 matching lines @@
   ++capturer_count_;
   DVLOG(1) << "There are now " << capturer_count_
            << " capturing(s) of WebContentsImpl@" << this;
 
   // Note: This provides a hint to upstream code to size the views optimally
   // for quality (e.g., to avoid scaling).
   if (!capture_size.IsEmpty() && preferred_size_for_capture_.IsEmpty()) {
     preferred_size_for_capture_ = capture_size;
     OnPreferredSizeChanged(preferred_size_);
   }
+
+  // Ensure that all views are un-occluded before capture begins.
+  WasUnOccluded();
 }
 
 void WebContentsImpl::DecrementCapturerCount() {
   --capturer_count_;
   DVLOG(1) << "There are now " << capturer_count_
            << " capturing(s) of WebContentsImpl@" << this;
   DCHECK_LE(0, capturer_count_);
 
   if (is_being_destroyed_)
     return;
@@ skipping 80 matching lines @@
     delegate_->NavigationStateChanged(this, changed_flags);
 }
 
 base::TimeTicks WebContentsImpl::GetLastActiveTime() const {
   return last_active_time_;
 }
 
 void WebContentsImpl::WasShown() {
   controller_.SetActive(true);
 
-  std::set<RenderWidgetHostView*> widgets = GetRenderWidgetHostViewsInTree();
-  for (std::set<RenderWidgetHostView*>::iterator iter = widgets.begin();
-       iter != widgets.end();
-       iter++) {
-    if (*iter) {
-      (*iter)->Show();
+  for (RenderWidgetHostView* view : GetRenderWidgetHostViewsInTree()) {
+    if (view) {
+      view->Show();
 #if defined(OS_MACOSX)
-      (*iter)->SetActive(true);
+      view->SetActive(true);
 #endif
     }
   }
 
   last_active_time_ = base::TimeTicks::Now();
 
   // The resize rect might have changed while this was inactive -- send the new
   // one to make sure it's up to date.
   RenderViewHostImpl* rvh =
       static_cast<RenderViewHostImpl*>(GetRenderViewHost());
@@ skipping 13 matching lines @@
 void WebContentsImpl::WasHidden() {
   // If there are entities capturing screenshots or video (e.g., mirroring),
   // don't activate the "disable rendering" optimization.
   if (capturer_count_ == 0) {
     // |GetRenderViewHost()| can be NULL if the user middle clicks a link to
     // open a tab in the background, then closes the tab before selecting it.
     // This is because closing the tab calls WebContentsImpl::Destroy(), which
     // removes the |GetRenderViewHost()|; then when we actually destroy the
     // window, OnWindowPosChanged() notices and calls WasHidden() (which
     // calls us).
-    std::set<RenderWidgetHostView*> widgets = GetRenderWidgetHostViewsInTree();
-    for (std::set<RenderWidgetHostView*>::iterator iter = widgets.begin();
-         iter != widgets.end();
-         iter++) {
-      if (*iter)
-        (*iter)->Hide();
+    for (RenderWidgetHostView* view : GetRenderWidgetHostViewsInTree()) {
+      if (view)
+        view->Hide();
     }
 
     // Release any video power save blockers held as video is not visible.
     video_power_save_blocker_.reset();
   }
 
   FOR_EACH_OBSERVER(WebContentsObserver, observers_, WasHidden());
 
   should_normally_be_visible_ = false;
 }
 
+void WebContentsImpl::WasOccluded() {
+  if (capturer_count_ > 0)
+    return;
+
+  for (RenderWidgetHostView* view : GetRenderWidgetHostViewsInTree()) {
+    if (view)
+      view->WasOccluded();
+  }
+}
+
+void WebContentsImpl::WasUnOccluded() {
+  for (RenderWidgetHostView* view : GetRenderWidgetHostViewsInTree()) {
+    if (view)
+      view->WasUnOccluded();
+  }
+}
+
 bool WebContentsImpl::NeedToFireBeforeUnload() {
   // TODO(creis): Should we fire even for interstitial pages?
   return WillNotifyDisconnection() &&
       !ShowingInterstitialPage() &&
       !static_cast<RenderViewHostImpl*>(
           GetRenderViewHost())->SuddenTerminationAllowed();
 }
 
 void WebContentsImpl::DispatchBeforeUnload(bool for_cross_site_transition) {
   static_cast<RenderFrameHostImpl*>(GetMainFrame())->DispatchBeforeUnload(
@@ skipping 3306 matching lines @@
   node->render_manager()->ResumeResponseDeferredAtStart();
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content