Implement Paint Containment

third_party/WebKit/Source/core/layout/LayoutInline.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 1122 matching lines @@
 
     if (container->hasOverflowClip())
         offset -= toLayoutBox(container)->scrolledContentOffset();
 
     if (offsetDependsOnPoint)
         *offsetDependsOnPoint = (container->isBox() && container->style()->isFlippedBlocksWritingMode()) || container->isLayoutFlowThread();
 
     return offset;
 }
 
+PaintLayerType LayoutInline::layerTypeRequired() const
+{
+    return isInFlowPositioned() || createsGroup() || hasClipPath() || style()->shouldCompositeForCurrentAnimations()
+        ||  style()->hasCompositorProxy() || style()->containsPaint() ? NormalPaintLayer : NoPaintLayer;
+}
+
 void LayoutInline::mapLocalToContainer(const LayoutBoxModelObject* paintInvalidationContainer, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed, const PaintInvalidationState* paintInvalidationState) const
 {
     if (paintInvalidationContainer == this)
         return;
 
     if (paintInvalidationState && paintInvalidationState->canMapToContainer(paintInvalidationContainer)) {
         LayoutSize offset = paintInvalidationState->paintOffset();
         if (style()->hasInFlowPosition() && layer())
             offset += layer()->offsetForInFlowPosition();
         transformState.move(offset);
@@ skipping 268 matching lines @@
 {
     LayoutBoxModelObject::invalidateDisplayItemClients(paintInvalidationContainer, invalidationReason, paintInvalidationRect);
 
     // Use the paintInvalidationRect of LayoutInline for inline boxes, which saves the cost to calculate paint invalidation rect
     // for every inline box. This won't cause more rasterization invalidations because the whole LayoutInline is being invalidated.
     for (InlineFlowBox* box = firstLineBox(); box; box = box->nextLineBox())
         paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*box, invalidationReason, paintInvalidationRect);
 }
 
 } // namespace blink