1 files changed, 59 insertions, 0 deletions
diff --git a/layout/painting/HitTestInfo.h b/layout/painting/HitTestInfo.h
new file mode 100644
index 0000000000..95438b810c
--- /dev/null
+++ b/layout/painting/HitTestInfo.h
@@ -0,0 +1,59 @@
+/* -*- 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 GFX_HITTESTINFO_H
+#define GFX_HITTESTINFO_H
+
+#include "mozilla/gfx/CompositorHitTestInfo.h"
+#include "mozilla/layers/ScrollableLayerGuid.h"
+#include "nsRect.h"
+
+class nsIFrame;
+
+namespace mozilla {
+
+class nsDisplayListBuilder;
+struct ActiveScrolledRoot;
+
+namespace wr {
+class DisplayListBuilder;
+}  // namespace wr
+
+/**
+ * A helper class that manages compositor hit testing information.
+ */
+class HitTestInfo {
+ public:
+  using CompositorHitTestInfo = gfx::CompositorHitTestInfo;
+  using ViewID = layers::ScrollableLayerGuid::ViewID;
+
+  ViewID GetViewId(wr::DisplayListBuilder& aBuilder,
+                   const ActiveScrolledRoot* aASR) const;
+
+  void Initialize(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame);
+  void InitializeScrollTarget(nsDisplayListBuilder* aBuilder);
+
+  void SetAreaAndInfo(const nsRect& aArea, const CompositorHitTestInfo& aInfo) {
+    mArea = aArea;
+    mInfo = aInfo;
+  }
+
+  static void Shutdown();
+
+  const nsRect& Area() const { return mArea; }
+  const CompositorHitTestInfo& Info() const { return mInfo; }
+
+  static const HitTestInfo& Empty();
+
+ private:
+  nsRect mArea;
+  CompositorHitTestInfo mInfo;
+  mozilla::Maybe<ViewID> mScrollTarget;
+};
+
+}  // namespace mozilla
+
+#endif