Implement Paint Containment

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 683 matching lines @@
     bool preferredLogicalWidthsDirty() const { return m_bitfields.preferredLogicalWidthsDirty(); }
 
     bool needsOverflowRecalcAfterStyleChange() const { return m_bitfields.selfNeedsOverflowRecalcAfterStyleChange() || m_bitfields.childNeedsOverflowRecalcAfterStyleChange(); }
     bool selfNeedsOverflowRecalcAfterStyleChange() const { return m_bitfields.selfNeedsOverflowRecalcAfterStyleChange(); }
     bool childNeedsOverflowRecalcAfterStyleChange() const { return m_bitfields.childNeedsOverflowRecalcAfterStyleChange(); }
 
     bool isSelectionBorder() const;
 
     bool hasClip() const { return isOutOfFlowPositioned() && !style()->hasAutoClip(); }
     bool hasOverflowClip() const { return m_bitfields.hasOverflowClip(); }
-    bool hasClipOrOverflowClip() const { return hasClip() || hasOverflowClip(); }
+    bool hasOverflowClipPaintContainmentOrClip() const { return hasClip() || hasOverflowClip() || style()->containsPaint(); }

[chrishtr, 2015/12/09 23:34:58]

hasClipRelatedProperty()

 
     bool hasTransformRelatedProperty() const { return m_bitfields.hasTransformRelatedProperty(); }
     bool hasMask() const { return style() && style()->hasMask(); }
     bool hasClipPath() const { return style() && style()->clipPath(); }
     bool hasHiddenBackface() const { return style() && style()->backfaceVisibility() == BackfaceVisibilityHidden; }
 
     bool hasFilter() const { return style() && style()->hasFilter(); }
     bool hasBackdropFilter() const { return style() && style()->hasBackdropFilter(); }
 
     bool hasShapeOutside() const { return style() && style()->shapeOutside(); }
@@ skipping 203 matching lines @@
     // LayoutBlocks are the one that handle laying out positioned elements,
     // thus this function is important during layout, to insert the positioned
     // elements into the correct LayoutBlock.
     //
     // See container() for the function that returns the containing block.
     // See LayoutBlock.h for some extra explanations on containing blocks.
     LayoutBlock* containingBlock() const;
 
     bool canContainFixedPositionObjects() const
     {
-        return isLayoutView() || (hasTransformRelatedProperty() && isLayoutBlock()) || isSVGForeignObject();
+        return isLayoutView() || (hasTransformRelatedProperty() && isLayoutBlock()) || isSVGForeignObject() || style()->containsPaint();
     }
 
     // Convert the given local point to absolute coordinates
     // FIXME: Temporary. If UseTransforms is true, take transforms into account. Eventually localToAbsolute() will always be transform-aware.
     FloatPoint localToAbsolute(const FloatPoint& localPoint = FloatPoint(), MapCoordinatesFlags = 0) const;
     FloatPoint absoluteToLocal(const FloatPoint&, MapCoordinatesFlags = 0) const;
 
     // Convert a local quad to absolute coordinates, taking transforms into account.
     FloatQuad localToAbsoluteQuad(const FloatQuad& quad, MapCoordinatesFlags mode = 0, bool* wasFixed = nullptr) const
     {
@@ skipping 1098 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