Refactor PaintLayer location and offset calculation especially for floats

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
@@ skipping 713 matching lines @@
   bool isElementContinuation() const {
     return node() && node()->layoutObject() != this;
   }
   bool isInlineElementContinuation() const {
     return isElementContinuation() && isInline();
   }
   virtual LayoutBoxModelObject* virtualContinuation() const { return nullptr; }
 
   bool isFloating() const { return m_bitfields.floating(); }
 
+  bool isFloatingWithNonContainingBlockParent() const {
+    return isFloating() && parent() && !parent()->isLayoutBlockFlow();
+  }
+
+  // absolute or fixed positioning
   bool isOutOfFlowPositioned() const {
     return m_bitfields.isOutOfFlowPositioned();
-  }  // absolute or fixed positioning
+  }
+  // relative or sticky positioning
   bool isInFlowPositioned() const {
     return m_bitfields.isInFlowPositioned();
-  }  // relative or sticky positioning
+  }
   bool isRelPositioned() const {
     return m_bitfields.isRelPositioned();
-  }  // relative positioning
+  }
   bool isStickyPositioned() const {
     return m_bitfields.isStickyPositioned();
-  }  // sticky positioning
+  }
   bool isFixedPositioned() const {
     return isOutOfFlowPositioned() && style()->position() == FixedPosition;
-  }  // fixed positioning
+  }
+  bool isAbsolutePositioned() const {
+    return isOutOfFlowPositioned() && style()->position() == AbsolutePosition;
+  }
   bool isPositioned() const { return m_bitfields.isPositioned(); }
 
   bool isText() const { return m_bitfields.isText(); }
   bool isBox() const { return m_bitfields.isBox(); }
   bool isInline() const { return m_bitfields.isInline(); }  // inline object
   bool isAtomicInlineLevel() const { return m_bitfields.isAtomicInlineLevel(); }
   bool isHorizontalWritingMode() const {
     return m_bitfields.horizontalWritingMode();
   }
   bool hasFlippedBlocksWritingMode() const {
@@ skipping 1955 matching lines @@
 CORE_EXPORT void showLineTree(const blink::LayoutObject*);
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1,
                                 const blink::LayoutObject* object2);
 
 #endif
 
 #endif  // LayoutObject_h