1 files changed, 51 insertions, 0 deletions
diff --git a/dom/animation/PseudoElementHashEntry.h b/dom/animation/PseudoElementHashEntry.h
new file mode 100644
index 0000000000..b532d86105
--- /dev/null
+++ b/dom/animation/PseudoElementHashEntry.h
@@ -0,0 +1,51 @@
+/* -*- 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_PseudoElementHashEntry_h
+#define mozilla_PseudoElementHashEntry_h
+
+#include "mozilla/dom/Element.h"
+#include "mozilla/AnimationTarget.h"
+#include "mozilla/HashFunctions.h"
+#include "PLDHashTable.h"
+
+namespace mozilla {
+
+// A hash entry that uses a RefPtr<dom::Element>, PseudoStyleType pair
+class PseudoElementHashEntry : public PLDHashEntryHdr {
+ public:
+  typedef NonOwningAnimationTarget KeyType;
+  typedef const NonOwningAnimationTarget* KeyTypePointer;
+
+  explicit PseudoElementHashEntry(KeyTypePointer aKey)
+      : mElement(aKey->mElement), mPseudoType(aKey->mPseudoType) {}
+  PseudoElementHashEntry(PseudoElementHashEntry&& aOther) = default;
+
+  ~PseudoElementHashEntry() = default;
+
+  KeyType GetKey() const { return {mElement, mPseudoType}; }
+  bool KeyEquals(KeyTypePointer aKey) const {
+    return mElement == aKey->mElement && mPseudoType == aKey->mPseudoType;
+  }
+
+  static KeyTypePointer KeyToPointer(KeyType& aKey) { return &aKey; }
+  static PLDHashNumber HashKey(KeyTypePointer aKey) {
+    if (!aKey) return 0;
+
+    // Convert the scoped enum into an integer while adding it to hash.
+    static_assert(sizeof(PseudoStyleType) == sizeof(uint8_t), "");
+    return mozilla::HashGeneric(aKey->mElement,
+                                static_cast<uint8_t>(aKey->mPseudoType));
+  }
+  enum { ALLOW_MEMMOVE = true };
+
+  RefPtr<dom::Element> mElement;
+  PseudoStyleType mPseudoType;
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_PseudoElementHashEntry_h