gecko-dev/dom/html/HTMLAudioElement.h
Kirk Steuber 7fdb378650 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

--HG--
extra : rebase_source : 9c3deec6d7aafd6411044d623d4863637b45fd58
2017-04-20 12:57:48 -07:00

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/* -*- 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 http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_HTMLAudioElement_h
#define mozilla_dom_HTMLAudioElement_h
#include "mozilla/Attributes.h"
#include "mozilla/dom/HTMLMediaElement.h"
#include "mozilla/dom/TypedArray.h"
typedef uint16_t nsMediaNetworkState;
typedef uint16_t nsMediaReadyState;
namespace mozilla {
namespace dom {
class HTMLAudioElement final : public HTMLMediaElement
{
public:
typedef mozilla::dom::NodeInfo NodeInfo;
explicit HTMLAudioElement(already_AddRefed<NodeInfo>& aNodeInfo);
// Element
virtual bool IsInteractiveHTMLContent(bool aIgnoreTabindex) const override;
// nsIDOMHTMLMediaElement
using HTMLMediaElement::GetPaused;
virtual nsresult Clone(NodeInfo *aNodeInfo, nsINode **aResult,
bool aPreallocateChildren) const override;
virtual nsresult SetAcceptHeader(nsIHttpChannel* aChannel) override;
virtual nsIDOMNode* AsDOMNode() override { return this; }
// WebIDL
static already_AddRefed<HTMLAudioElement>
Audio(const GlobalObject& aGlobal,
const Optional<nsAString>& aSrc, ErrorResult& aRv);
protected:
virtual ~HTMLAudioElement();
virtual JSObject* WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_HTMLAudioElement_h