[S.P.] Don't draw frames of animated images that are offscreen

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 1095 matching lines @@
     // necessitating this check here.
     // ASSERT(frame()->page());
     if (frame().page())
         frame().page()->chrome().client().layoutUpdated(m_frame.get());
 }
 
 // The plan is to move to compositor-queried paint invalidation, in which case this
 // method would setNeedsRedraw on the GraphicsLayers with invalidations and
 // let the compositor pick which to actually draw.
 // See http://crbug.com/306706
-void FrameView::invalidateTreeIfNeeded()
+void FrameView::invalidateTreeIfNeeded(Vector<LayoutObject*>& pendingDelayedPaintInvalidations)
 {
     ASSERT(layoutView());
     LayoutView& rootForPaintInvalidation = *layoutView();
     ASSERT(!rootForPaintInvalidation.needsLayout());
 
     TRACE_EVENT1("blink", "FrameView::invalidateTree", "root", rootForPaintInvalidation.debugName().ascii());
 
-    PaintInvalidationState rootPaintInvalidationState(rootForPaintInvalidation);
+    PaintInvalidationState rootPaintInvalidationState(rootForPaintInvalidation, pendingDelayedPaintInvalidations);
 
     // In slimming paint mode we do per-object invalidation.
     if (m_doFullPaintInvalidation && !RuntimeEnabledFeatures::slimmingPaintEnabled())
         layoutView()->compositor()->fullyInvalidatePaint();
 
     rootForPaintInvalidation.invalidateTreeIfNeeded(rootPaintInvalidationState);
 
     // Invalidate the paint of the frameviews scrollbars if needed
     if (hasVerticalBarDamage())
         invalidateRect(verticalBarDamage());
     if (hasHorizontalBarDamage())
         invalidateRect(horizontalBarDamage());
     resetScrollbarDamage();
 
-
 #if ENABLE(ASSERT)
     layoutView()->assertSubtreeClearedPaintInvalidationState();
 #endif
 
     if (m_frame->selection().isCaretBoundsDirty())
         m_frame->selection().invalidateCaretRect();
 }
 
 DocumentLifecycle& FrameView::lifecycle() const
 {
@@ skipping 1450 matching lines @@
     m_frame->document()->layoutView()->assertRendererLaidOut();
 #endif
 
     updateWidgetPositionsIfNeeded();
 }
 
 void FrameView::invalidateTreeIfNeededRecursive()
 {
     // FIXME: We should be more aggressive at cutting tree traversals.
     lifecycle().advanceTo(DocumentLifecycle::InPaintInvalidation);
-    invalidateTreeIfNeeded();
+
+    Vector<LayoutObject*> pendingDelayedPaintInvalidations;
+
+    invalidateTreeIfNeeded(pendingDelayedPaintInvalidations);
 
     for (Frame* child = m_frame->tree().firstChild(); child; child = child->tree().nextSibling()) {
         if (!child->isLocalFrame())
             continue;
 
         toLocalFrame(child)->view()->invalidateTreeIfNeededRecursive();
     }
 
     m_doFullPaintInvalidation = false;
     lifecycle().advanceTo(DocumentLifecycle::PaintInvalidationClean);
+
+    // Process objects needing paint invalidation on the next frame. See the definition of PaintInvalidationDelayedFull for more details.
+    for (auto& target : pendingDelayedPaintInvalidations)
+        target->setShouldDoFullPaintInvalidation(PaintInvalidationDelayedFull);
 }
 
 void FrameView::enableAutoSizeMode(const IntSize& minSize, const IntSize& maxSize)
 {
     if (!m_autoSizeInfo)
         m_autoSizeInfo = FrameViewAutoSizeInfo::create(this);
 
     m_autoSizeInfo->configureAutoSizeMode(minSize, maxSize);
     setLayoutSizeFixedToFrameSize(true);
     setNeedsLayout();
@@ skipping 1417 matching lines @@
 {
     Settings* settings = frame().settings();
     if (!settings || !settings->rootLayerScrolls())
         return this;
 
     LayoutView* layoutView = this->layoutView();
     return layoutView ? layoutView->scrollableArea() : nullptr;
 }
 
 } // namespace blink