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diff --git a/layout/generic/nsImageMap.h b/layout/generic/nsImageMap.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/. */
+
+/* code for HTML client-side image maps */
+
+#ifndef nsImageMap_h
+#define nsImageMap_h
+
+#include "mozilla/gfx/2D.h"
+#include "nsCOMPtr.h"
+#include "nsCoord.h"
+#include "nsTArray.h"
+#include "nsStubMutationObserver.h"
+#include "nsIDOMEventListener.h"
+#include "Units.h"
+
+class Area;
+class nsImageFrame;
+class nsIFrame;
+class nsIContent;
+struct nsRect;
+
+namespace mozilla {
+namespace dom {
+class HTMLAreaElement;
+}
+} // namespace mozilla
+
+class nsImageMap final : public nsStubMutationObserver,
+ public nsIDOMEventListener {
+ typedef mozilla::gfx::DrawTarget DrawTarget;
+ typedef mozilla::gfx::ColorPattern ColorPattern;
+ typedef mozilla::gfx::StrokeOptions StrokeOptions;
+
+ public:
+ nsImageMap();
+
+ void Init(nsImageFrame* aImageFrame, nsIContent* aMap);
+
+ /**
+ * Return the first area element (in content order) for the given point in
+ * CSS pixel coordinate or nullptr if the coordinate is outside all areas.
+ */
+ mozilla::dom::HTMLAreaElement* GetArea(const mozilla::CSSIntPoint& aPt) const;
+
+ /**
+ * Return area elements count associated with the image map.
+ */
+ uint32_t AreaCount() const { return mAreas.Length(); }
+
+ /**
+ * Return area element at the given index.
+ */
+ mozilla::dom::HTMLAreaElement* GetAreaAt(uint32_t aIndex) const;
+
+ void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+ const ColorPattern& aColor,
+ const StrokeOptions& aStrokeOptions = StrokeOptions());
+
+ /**
+ * Called just before the nsImageFrame releases us.
+ * Used to break the cycle caused by the DOM listener.
+ */
+ void Destroy();
+
+ // nsISupports
+ NS_DECL_ISUPPORTS
+
+ // nsIMutationObserver
+ NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+ NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+ NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+ NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
+ NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED
+
+ // nsIDOMEventListener
+ NS_DECL_NSIDOMEVENTLISTENER
+
+ nsresult GetBoundsForAreaContent(nsIContent* aContent, nsRect& aBounds);
+
+ using AreaList = AutoTArray<mozilla::UniquePtr<Area>, 8>;
+
+ protected:
+ virtual ~nsImageMap();
+
+ void FreeAreas();
+
+ void UpdateAreas();
+
+ void SearchForAreas(nsIContent* aParent);
+
+ void AddArea(mozilla::dom::HTMLAreaElement* aArea);
+ void AreaRemoved(mozilla::dom::HTMLAreaElement* aArea);
+
+ void MaybeUpdateAreas(nsIContent* aContent);
+
+ nsImageFrame* mImageFrame; // the frame that owns us
+ nsCOMPtr<nsIContent> mMap;
+
+ // almost always has some entries
+ AreaList mAreas;
+
+ // This is set when we search for all area children and tells us whether we
+ // should consider the whole subtree or just direct children when we get
+ // content notifications about changes inside the map subtree.
+ bool mConsiderWholeSubtree;
+};
+
+#endif /* nsImageMap_h */