Subtree caching implementation in blink-core

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 2445 matching lines @@
     if (LayoutView* view = layoutView()) {
         TRACE_EVENT1("devtools.timeline", "UpdateLayerTree", "data", InspectorUpdateLayerTreeEvent::data(m_frame.get()));
 
         // This was required for slimming paint v1 but is only temporarily
         // needed for slimming paint v2.
         view->compositor()->updateIfNeededRecursive();
         scrollContentsIfNeededRecursive();
 
         ASSERT(lifecycle().state() >= DocumentLifecycle::CompositingClean);
 
-        if (phases == AllPhases) {
-            invalidateTreeIfNeededRecursive();
+        if (phases == OnlyUpToCompositingCleanPlusScrolling)
+            return;
 
-            if (view->compositor()->inCompositingMode())
-                scrollingCoordinator()->updateAfterCompositingChangeIfNeeded();
+        invalidateTreeIfNeededRecursive();
 
-            updateCompositedSelectionIfNeeded();
+        if (view->compositor()->inCompositingMode())
+            scrollingCoordinator()->updateAfterCompositingChangeIfNeeded();
 
-            if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
-                paintForSlimmingPaintV2();
-                compositeForSlimmingPaintV2();
-            }
+        updateCompositedSelectionIfNeeded();
 
-            if (RuntimeEnabledFeatures::frameTimingSupportEnabled())
-                updateFrameTimingRequestsIfNeeded();
+        if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
+            paintForSlimmingPaintV2();
+            if (phases == OnlyUpToPaintForSlimmingPaintV2Clean)
+                return;
+            compositeForSlimmingPaintV2();
+        }
 
-            ASSERT(!view->hasPendingSelection());
-            ASSERT(lifecycle().state() == DocumentLifecycle::PaintInvalidationClean
-                || (RuntimeEnabledFeatures::slimmingPaintV2Enabled() && lifecycle().state() == DocumentLifecycle::CompositingForSlimmingPaintV2Clean));
-        }
+        if (RuntimeEnabledFeatures::frameTimingSupportEnabled())
+            updateFrameTimingRequestsIfNeeded();
+
+        ASSERT(!view->hasPendingSelection());
+        ASSERT(lifecycle().state() == DocumentLifecycle::PaintInvalidationClean
+            || (RuntimeEnabledFeatures::slimmingPaintV2Enabled() && lifecycle().state() == DocumentLifecycle::CompositingForSlimmingPaintV2Clean));
     }
 }
 
 void FrameView::paintForSlimmingPaintV2()
 {
     ASSERT(RuntimeEnabledFeatures::slimmingPaintV2Enabled());
     ASSERT(frame() == page()->mainFrame() || (!frame().tree().parent()->isLocalFrame()));
 
     LayoutView* view = layoutView();
     ASSERT(view);
@@ skipping 1482 matching lines @@
 
     if (!graphicsLayer)
         return;
 
     DeprecatedPaintLayer::mapRectToPaintInvalidationBacking(localFrame->contentLayoutObject(), paintInvalidationContainer, viewRect);
 
     graphicsLayerTimingRequests.add(graphicsLayer, Vector<std::pair<int64_t, WebRect>>()).storedValue->value.append(std::make_pair(m_frame->frameID(), enclosingIntRect(viewRect)));
 }
 
 } // namespace blink