New paint invalidation using paint property tree walk

third_party/WebKit/Source/core/layout/svg/LayoutSVGInline.cpp

 /*
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 132 matching lines @@
         return;
     }
     Vector<SVGTextLayoutAttributes*, 2> affectedAttributes;
     textLayoutObject->subtreeChildWillBeRemoved(child, affectedAttributes);
     LayoutInline::removeChild(child);
     textLayoutObject->subtreeChildWasRemoved(affectedAttributes);
 }
 
 void LayoutSVGInline::invalidateTreeIfNeeded(PaintInvalidationState& paintInvalidationState)
 {
+    ASSERT(!RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled());

[chrishtr, 2016/03/11 21:30:00]

Why?

[Xianzhu, 2016/03/11 22:01:47]

Now we walk the tree in PrePaintTreeWalk in place of invalidateTreeIfNeeded and
invalidatePaintOfSubtreesIfNeeded. Next step is to extract all special logics in
all invalidateTreeIfNeeded() into PrePaintTreeWalk. Now these logics are still
missed with this patch.

     ASSERT(!needsLayout());
 
     if (!shouldCheckForPaintInvalidation(paintInvalidationState))
         return;
 
     PaintInvalidationReason reason = invalidatePaintIfNeeded(paintInvalidationState, paintInvalidationState.paintInvalidationContainer());
     clearPaintInvalidationState(paintInvalidationState);
 
     if (reason == PaintInvalidationDelayedFull)
         paintInvalidationState.pushDelayedPaintInvalidationTarget(*this);
 
     PaintInvalidationState childTreeWalkState(paintInvalidationState, *this, paintInvalidationState.paintInvalidationContainer());
     if (reason == PaintInvalidationSVGResourceChange)
         childTreeWalkState.setForceSubtreeInvalidationWithinContainer();
     invalidatePaintOfSubtreesIfNeeded(childTreeWalkState);
 }
 
 } // namespace blink