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diff --git a/dom/svg/DOMSVGPoint.h b/dom/svg/DOMSVGPoint.h
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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 DOM_SVG_DOMSVGPOINT_H_
+#define DOM_SVG_DOMSVGPOINT_H_
+
+#include "DOMSVGPointList.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsDebug.h"
+#include "SVGPoint.h"
+#include "nsWrapperCache.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/FloatingPoint.h"
+#include "mozilla/dom/SVGSVGElement.h"
+#include "mozilla/gfx/2D.h"
+
+#define MOZ_SVG_LIST_INDEX_BIT_COUNT 30
+
+namespace mozilla::dom {
+struct DOMMatrix2DInit;
+
+/**
+ * Class DOMSVGPoint
+ *
+ * This class creates the DOM objects that wrap internal SVGPoint objects that
+ * are in an SVGPointList. It is also used to create the objects returned by
+ * SVGSVGElement.createSVGPoint() and other functions that return DOM SVGPoint
+ * objects.
+ *
+ * See the architecture comment in DOMSVGPointList.h for an overview of the
+ * important points regarding these DOM wrapper structures.
+ *
+ * See the architecture comment in DOMSVGLength.h (yes, LENGTH) for an overview
+ * of the important points regarding how this specific class works.
+ */
+class DOMSVGPoint final : public nsWrapperCache {
+ template <class T>
+ friend class AutoChangePointListNotifier;
+
+ using Point = gfx::Point;
+
+ public:
+ /**
+ * Generic ctor for DOMSVGPoint objects that are created for an attribute.
+ */
+ DOMSVGPoint(DOMSVGPointList* aList, uint32_t aListIndex, bool aIsAnimValItem)
+ : mVal(nullptr),
+ mOwner(aList),
+ mListIndex(aListIndex),
+ mIsAnimValItem(aIsAnimValItem),
+ mIsTranslatePoint(false) {
+ // These shifts are in sync with the members.
+ MOZ_ASSERT(aList && aListIndex <= MaxListIndex(), "bad arg");
+
+ MOZ_ASSERT(IndexIsValid(), "Bad index for DOMSVGPoint!");
+ }
+
+ // Constructor for unowned points and SVGSVGElement.createSVGPoint
+ explicit DOMSVGPoint(const Point& aPt)
+ : mListIndex(0), mIsAnimValItem(false), mIsTranslatePoint(false) {
+ // In this case we own mVal
+ mVal = new SVGPoint(aPt.x, aPt.y);
+ }
+
+ private:
+ // The translate of an SVGSVGElement
+ DOMSVGPoint(SVGPoint* aPt, SVGSVGElement* aSVGSVGElement)
+ : mVal(aPt),
+ mOwner(ToSupports(aSVGSVGElement)),
+ mListIndex(0),
+ mIsAnimValItem(false),
+ mIsTranslatePoint(true) {}
+
+ virtual ~DOMSVGPoint() { CleanupWeakRefs(); }
+
+ public:
+ NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(DOMSVGPoint)
+ NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(DOMSVGPoint)
+
+ static already_AddRefed<DOMSVGPoint> GetTranslateTearOff(
+ SVGPoint* aVal, SVGSVGElement* aSVGSVGElement);
+
+ bool IsInList() const { return HasOwner() && !IsTranslatePoint(); }
+
+ /**
+ * "Owner" here means that the instance has an
+ * internal counterpart from which it gets its values. (A better name may
+ * be HasWrappee().)
+ */
+ bool HasOwner() const { return !!mOwner; }
+
+ bool IsTranslatePoint() const { return mIsTranslatePoint; }
+
+ void DidChangeTranslate();
+
+ /**
+ * This method is called to notify this DOM object that it is being inserted
+ * into a list, and give it the information it needs as a result.
+ *
+ * This object MUST NOT already belong to a list when this method is called.
+ * That's not to say that script can't move these DOM objects between
+ * lists - it can - it's just that the logic to handle that (and send out
+ * the necessary notifications) is located elsewhere (in DOMSVGPointList).)
+ */
+ void InsertingIntoList(DOMSVGPointList* aList, uint32_t aListIndex,
+ bool aIsAnimValItem);
+
+ static uint32_t MaxListIndex() {
+ return (1U << MOZ_SVG_LIST_INDEX_BIT_COUNT) - 1;
+ }
+
+ /// This method is called to notify this object that its list index changed.
+ void UpdateListIndex(uint32_t aListIndex) { mListIndex = aListIndex; }
+
+ /**
+ * This method is called to notify this DOM object that it is about to be
+ * removed from its current DOM list so that it can first make a copy of its
+ * internal counterpart's values. (If it didn't do this, then it would
+ * "lose" its value on being removed.)
+ */
+ void RemovingFromList();
+
+ SVGPoint ToSVGPoint() { return InternalItem(); }
+
+ // WebIDL
+ float X();
+ void SetX(float aX, ErrorResult& rv);
+ float Y();
+ void SetY(float aY, ErrorResult& rv);
+ already_AddRefed<DOMSVGPoint> MatrixTransform(const DOMMatrix2DInit& aMatrix,
+ ErrorResult& aRv);
+
+ nsISupports* GetParentObject() { return Element(); }
+
+ /**
+ * Returns true if our attribute is animating (in which case our animVal is
+ * not simply a mirror of our baseVal).
+ */
+ bool AttrIsAnimating() const;
+
+ JSObject* WrapObject(JSContext* cx,
+ JS::Handle<JSObject*> aGivenProto) override;
+
+ DOMSVGPoint* Copy() { return new DOMSVGPoint(InternalItem()); }
+
+ private:
+#ifdef DEBUG
+ bool IndexIsValid();
+#endif
+
+ SVGElement* Element();
+
+ /**
+ * Clears soon-to-be-invalid weak references in external objects that were
+ * set up during the creation of this object. This should be called during
+ * destruction and during cycle collection.
+ */
+ void CleanupWeakRefs();
+
+ /**
+ * Get a reference to the internal SVGPoint list item that this DOM wrapper
+ * object currently wraps.
+ */
+ SVGPoint& InternalItem();
+
+ SVGPoint* mVal; // If mIsTranslatePoint is true, the element owns
+ // the value. Otherwise we do.
+ RefPtr<nsISupports> mOwner; // If mIsTranslatePoint is true, this is an
+ // SVGSVGElement, if we're unowned it's null, or
+ // we're in a list and it's a DOMSVGPointList
+
+ // Bounds for the following are checked in the ctor, so be sure to update
+ // that if you change the capacity of any of the following.
+
+ uint32_t mListIndex : MOZ_SVG_LIST_INDEX_BIT_COUNT;
+ uint32_t mIsAnimValItem : 1; // True if We're the animated value of a list
+ uint32_t mIsTranslatePoint : 1; // true iff our owner is a SVGSVGElement
+};
+
+} // namespace mozilla::dom
+
+#undef MOZ_SVG_LIST_INDEX_BIT_COUNT
+
+#endif // DOM_SVG_DOMSVGPOINT_H_