author Kirk Steuber <>
Thu, 20 Apr 2017 12:57:48 -0700
changeset 403749 c6af127dce9d85ee8c42b13235b5fa6133d3a0e2
parent 309477 dee213acd662a8e9f3535d4bbefd34102d9efc1e
child 435808 67a8e12324569dd730347187e2ffccae486c758b
permissions -rw-r--r--
Bug 1359556 - Optimize cloneNode by preinitializing attribute and child arrays r=bz Currently, attribute and child arrays (implemented in dom/base/nsAttrAndChildArray.h) start out empty. When cloning, the array ends up being resized multiple times in order to add the attributes and children that are being cloned from the original node. This would be quicker if the array was initialized to the correct size in the first place so that resizes are not necessary. However, preallocating space for children is only necessary when performing a deep clone. Therefore, an additional parameter is being added to the Clone, CopyInnerTo, and CloneDocHelper methods to indicate whether preallocation of children should happen. Attributes are copied either way, so that part of the array is preallocated in both cases. MozReview-Commit-ID: 3iVezeAKXnI

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at */

#ifndef mozilla_dom_SVGForeignObjectElement_h
#define mozilla_dom_SVGForeignObjectElement_h

#include "mozilla/dom/SVGGraphicsElement.h"
#include "nsSVGLength2.h"

nsresult NS_NewSVGForeignObjectElement(nsIContent **aResult,
                                       already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);

class nsSVGForeignObjectFrame;

namespace mozilla {
namespace dom {

class SVGForeignObjectElement final : public SVGGraphicsElement
  friend class ::nsSVGForeignObjectFrame;

  friend nsresult (::NS_NewSVGForeignObjectElement(nsIContent **aResult,
                                                   already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo));
  explicit SVGForeignObjectElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo);
  virtual JSObject* WrapNode(JSContext *cx, JS::Handle<JSObject*> aGivenProto) override;

  // nsSVGElement specializations:
  virtual gfxMatrix PrependLocalTransformsTo(
    const gfxMatrix &aMatrix,
    SVGTransformTypes aWhich = eAllTransforms) const override;
  virtual bool HasValidDimensions() const override;

  // nsIContent interface
  virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
                              nsIContent* aBindingParent,
                              bool aCompileEventHandlers) override;
  NS_IMETHOD_(bool) IsAttributeMapped(const nsIAtom* name) const override;

  virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult,
                         bool aPreallocateChildren) const override;

  // WebIDL
  already_AddRefed<SVGAnimatedLength> X();
  already_AddRefed<SVGAnimatedLength> Y();
  already_AddRefed<SVGAnimatedLength> Width();
  already_AddRefed<SVGAnimatedLength> Height();


  virtual LengthAttributesInfo GetLengthInfo() override;

  nsSVGLength2 mLengthAttributes[4];
  static LengthInfo sLengthInfo[4];

} // namespace dom
} // namespace mozilla

#endif // mozilla_dom_SVGForeignObjectElement_h