1 files changed, 55 insertions, 0 deletions
diff --git a/dom/animation/AnimationPropertySegment.h b/dom/animation/AnimationPropertySegment.h
new file mode 100644
index 0000000000..fb4ea7ee26
--- /dev/null
+++ b/dom/animation/AnimationPropertySegment.h
@@ -0,0 +1,55 @@
+/* -*- 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_AnimationPropertySegment_h
+#define mozilla_dom_AnimationPropertySegment_h
+
+#include "mozilla/ServoStyleConsts.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/StyleAnimationValue.h"           // For AnimationValue
+#include "mozilla/dom/BaseKeyframeTypesBinding.h"  // For CompositeOperation
+
+namespace mozilla {
+
+struct AnimationPropertySegment {
+  float mFromKey, mToKey;
+  // NOTE: In the case that no keyframe for 0 or 1 offset is specified
+  // the unit of mFromValue or mToValue is eUnit_Null.
+  AnimationValue mFromValue, mToValue;
+
+  Maybe<StyleComputedTimingFunction> mTimingFunction;
+  dom::CompositeOperation mFromComposite = dom::CompositeOperation::Replace;
+  dom::CompositeOperation mToComposite = dom::CompositeOperation::Replace;
+
+  bool HasReplaceableValues() const {
+    return HasReplaceableFromValue() && HasReplaceableToValue();
+  }
+
+  bool HasReplaceableFromValue() const {
+    return !mFromValue.IsNull() &&
+           mFromComposite == dom::CompositeOperation::Replace;
+  }
+
+  bool HasReplaceableToValue() const {
+    return !mToValue.IsNull() &&
+           mToComposite == dom::CompositeOperation::Replace;
+  }
+
+  bool operator==(const AnimationPropertySegment& aOther) const {
+    return mFromKey == aOther.mFromKey && mToKey == aOther.mToKey &&
+           mFromValue == aOther.mFromValue && mToValue == aOther.mToValue &&
+           mTimingFunction == aOther.mTimingFunction &&
+           mFromComposite == aOther.mFromComposite &&
+           mToComposite == aOther.mToComposite;
+  }
+  bool operator!=(const AnimationPropertySegment& aOther) const {
+    return !(*this == aOther);
+  }
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_dom_AnimationPropertySegment_h