1 files changed, 81 insertions, 0 deletions
diff --git a/dom/smil/nsSMILValue.h b/dom/smil/nsSMILValue.h
new file mode 100644
index 000000000..c0998d61d
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+++ b/dom/smil/nsSMILValue.h
@@ -0,0 +1,81 @@
+/* -*- 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 NS_SMILVALUE_H_
+#define NS_SMILVALUE_H_
+
+#include "nsISMILType.h"
+#include "nsSMILNullType.h"
+
+/**
+ * Although objects of this type are generally only created on the stack and
+ * only exist during the taking of a new time sample, that's not always the
+ * case. The nsSMILValue objects obtained from attributes' base values are
+ * cached so that the SMIL engine can make certain optimizations during a
+ * sample if the base value has not changed since the last sample (potentially
+ * avoiding recomposing). These nsSMILValue objects typically live much longer
+ * than a single sample.
+ */
+class nsSMILValue
+{
+public:
+  nsSMILValue() : mU(), mType(nsSMILNullType::Singleton()) { }
+  explicit nsSMILValue(const nsISMILType* aType);
+  nsSMILValue(const nsSMILValue& aVal);
+
+  ~nsSMILValue()
+  {
+    mType->Destroy(*this);
+  }
+
+  const nsSMILValue& operator=(const nsSMILValue& aVal);
+
+  // Move constructor / reassignment operator:
+  nsSMILValue(nsSMILValue&& aVal);
+  nsSMILValue& operator=(nsSMILValue&& aVal);
+
+  // Equality operators. These are allowed to be conservative (return false
+  // more than you'd expect) - see comment above nsISMILType::IsEqual.
+  bool operator==(const nsSMILValue& aVal) const;
+  bool operator!=(const nsSMILValue& aVal) const {
+    return !(*this == aVal);
+  }
+
+  bool IsNull() const
+  {
+    return (mType == nsSMILNullType::Singleton());
+  }
+
+  nsresult Add(const nsSMILValue& aValueToAdd, uint32_t aCount = 1);
+  nsresult SandwichAdd(const nsSMILValue& aValueToAdd);
+  nsresult ComputeDistance(const nsSMILValue& aTo, double& aDistance) const;
+  nsresult Interpolate(const nsSMILValue& aEndVal,
+                       double aUnitDistance,
+                       nsSMILValue& aResult) const;
+
+  union {
+    bool mBool;
+    uint64_t mUint;
+    int64_t mInt;
+    double mDouble;
+    struct {
+      float mAngle;
+      uint16_t mUnit;
+      uint16_t mOrientType;
+    } mOrient;
+    int32_t mIntPair[2];
+    float mNumberPair[2];
+    void* mPtr;
+  } mU;
+  const nsISMILType* mType;
+
+protected:
+  void InitAndCheckPostcondition(const nsISMILType* aNewType);
+  void DestroyAndCheckPostcondition();
+  void DestroyAndReinit(const nsISMILType* aNewType);
+};
+
+#endif  // NS_SMILVALUE_H_