author Kirk Steuber <>
Thu, 20 Apr 2017 12:57:48 -0700
changeset 403749 c6af127dce9d85ee8c42b13235b5fa6133d3a0e2
parent 301570 e8c7dfe727cd970e2c3294934e2927b14143c205
child 485687 36a50c3f679a741a2a3a1ca89b192e8656262d0d
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_SVGFEMergeElement_h
#define mozilla_dom_SVGFEMergeElement_h

#include "nsSVGFilters.h"

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

namespace mozilla {
namespace dom {

typedef nsSVGFE SVGFEMergeElementBase;

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

  virtual FilterPrimitiveDescription
    GetPrimitiveDescription(nsSVGFilterInstance* aInstance,
                            const IntRect& aFilterSubregion,
                            const nsTArray<bool>& aInputsAreTainted,
                            nsTArray<RefPtr<SourceSurface>>& aInputImages) override;
  virtual nsSVGString& GetResultImageName() override { return mStringAttributes[RESULT]; }
  virtual void GetSourceImageNames(nsTArray<nsSVGStringInfo>& aSources) override;

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

  enum { RESULT };
  nsSVGString mStringAttributes[1];
  static StringInfo sStringInfo[1];

} // namespace dom
} // namespace mozilla

#endif // mozilla_dom_SVGFEMergeElement_h