Don't invalidate paint on background image change if it's obscured

third_party/WebKit/Source/core/layout/LayoutObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 1324 matching lines @@
     void clearShouldDoFullPaintInvalidation() { m_bitfields.setFullPaintInvalidationReason(PaintInvalidationNone); }
 
     virtual void clearPaintInvalidationFlags(const PaintInvalidationState&);
 
     bool mayNeedPaintInvalidation() const { return m_bitfields.mayNeedPaintInvalidation(); }
     void setMayNeedPaintInvalidation();
 
     bool mayNeedPaintInvalidationSubtree() const { return m_bitfields.mayNeedPaintInvalidationSubtree(); }
     void setMayNeedPaintInvalidationSubtree();
 
+    bool mayNeedPaintInvalidationAnimatedBackgroundImage() const { return m_bitfields.mayNeedPaintInvalidationAnimatedBackgroundImage(); }
+    void setMayNeedPaintInvalidationAnimatgedBackgroundImage();
+
     bool shouldInvalidateSelection() const { return m_bitfields.shouldInvalidateSelection(); }
     void setShouldInvalidateSelection();
 
     bool shouldCheckForPaintInvalidation(const PaintInvalidationState& paintInvalidationState) const
     {
         return paintInvalidationState.hasForcedSubtreeInvalidationFlags()
             || shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState();
     }
 
     bool shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState() const
@@ skipping 373 matching lines @@
             , m_needsPositionedMovementLayout(false)
             , m_normalChildNeedsLayout(false)
             , m_posChildNeedsLayout(false)
             , m_needsSimplifiedNormalFlowLayout(false)
             , m_selfNeedsOverflowRecalcAfterStyleChange(false)
             , m_childNeedsOverflowRecalcAfterStyleChange(false)
             , m_preferredLogicalWidthsDirty(false)
             , m_childShouldCheckForPaintInvalidation(false)
             , m_mayNeedPaintInvalidation(false)
             , m_mayNeedPaintInvalidationSubtree(false)
+            , m_mayNeedPaintInvalidationAnimatedBackgroundImage(false)
             , m_shouldInvalidateSelection(false)
             , m_floating(false)
             , m_isAnonymous(!node)
             , m_isText(false)
             , m_isBox(false)
             , m_isInline(true)
             , m_isAtomicInlineLevel(false)
             , m_horizontalWritingMode(true)
             , m_isDragging(false)
             , m_hasLayer(false)
@@ skipping 15 matching lines @@
             , m_isBackgroundAttachmentFixedObject(false)
             , m_isScrollAnchorObject(false)
             , m_hasBoxDecorationBackground(false)
             , m_positionedState(IsStaticallyPositioned)
             , m_selectionState(SelectionNone)
             , m_backgroundObscurationState(BackgroundObscurationStatusInvalid)
             , m_fullPaintInvalidationReason(PaintInvalidationNone)
         {
         }
 
-        // 32 bits have been used in the first word, and 17 in the second.
+        // 32 bits have been used in the first word, and 18 in the second.
 
         // Self needs layout means that this layout object is marked for a full layout.
         // This is the default layout but it is expensive as it recomputes everything.
         // For CSS boxes, this includes the width (laying out the line boxes again), the margins
         // (due to block collapsing margins), the positions, the height and the potential overflow.
         ADD_BOOLEAN_BITFIELD(selfNeedsLayout, SelfNeedsLayout);
 
         // A positioned movement layout is a specialized type of layout used on positioned objects
         // that only visually moved. This layout is used when changing 'top'/'left' on a positioned
         // element or margins on an out-of-flow one. Because the following operations don't impact
@@ skipping 30 matching lines @@
 
         // This boolean marks preferred logical widths for lazy recomputation.
         //
         // See INTRINSIC SIZES / PREFERRED LOGICAL WIDTHS above about those
         // widths.
         ADD_BOOLEAN_BITFIELD(preferredLogicalWidthsDirty, PreferredLogicalWidthsDirty);
 
         ADD_BOOLEAN_BITFIELD(childShouldCheckForPaintInvalidation, ChildShouldCheckForPaintInvalidation);
         ADD_BOOLEAN_BITFIELD(mayNeedPaintInvalidation, MayNeedPaintInvalidation);
         ADD_BOOLEAN_BITFIELD(mayNeedPaintInvalidationSubtree, MayNeedPaintInvalidationSubtree);
+        ADD_BOOLEAN_BITFIELD(mayNeedPaintInvalidationAnimatedBackgroundImage, MayNeedPaintInvalidationAnimatedBackgroundImage);
         ADD_BOOLEAN_BITFIELD(shouldInvalidateSelection, ShouldInvalidateSelection);
 
         // This boolean is the cached value of 'float'
         // (see ComputedStyle::isFloating).
         ADD_BOOLEAN_BITFIELD(floating, Floating);
 
         ADD_BOOLEAN_BITFIELD(isAnonymous, IsAnonymous);
         ADD_BOOLEAN_BITFIELD(isText, IsText);
         ADD_BOOLEAN_BITFIELD(isBox, IsBox);
 
@@ skipping 348 matching lines @@
 void showTree(const blink::LayoutObject*);
 void showLineTree(const blink::LayoutObject*);
 void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 void showLayoutTree(const blink::LayoutObject* object1, const blink::LayoutObject* object2);
 
 #endif
 
 #endif // LayoutObject_h