Add m-esr52 at 52.6.0

1 files changed, 602 insertions, 0 deletions

diff --git a/layout/style/StyleAnimationValue.h b/layout/style/StyleAnimationValue.h
new file mode 100644
index 000000000..e318cecb6
--- /dev/null
+++ b/layout/style/StyleAnimationValue.h
@@ -0,0 +1,602 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/* Utilities for animation of computed style values */
+
+#ifndef mozilla_StyleAnimationValue_h_
+#define mozilla_StyleAnimationValue_h_
+
+#include "mozilla/gfx/MatrixFwd.h"
+#include "mozilla/UniquePtr.h"
+#include "nsStringFwd.h"
+#include "nsStringBuffer.h"
+#include "nsCoord.h"
+#include "nsColor.h"
+#include "nsCSSProps.h"
+#include "nsCSSValue.h"
+#include "nsStyleCoord.h"
+
+class nsIFrame;
+class nsStyleContext;
+class gfx3DMatrix;
+struct RawServoDeclarationBlock;
+
+namespace mozilla {
+
+namespace css {
+class StyleRule;
+} // namespace css
+
+namespace dom {
+class Element;
+} // namespace dom
+
+enum class CSSPseudoElementType : uint8_t;
+struct PropertyStyleAnimationValuePair;
+
+/**
+ * Utility class to handle animated style values
+ */
+class StyleAnimationValue {
+public:
+  // Mathematical methods
+  // --------------------
+  /**
+   * Adds |aCount| copies of |aValueToAdd| to |aDest|.  The result of this
+   * addition is stored in aDest.
+   *
+   * Note that if |aCount| is 0, then |aDest| will be unchanged.  Also, if
+   * this method fails, then |aDest| will be unchanged.
+   *
+   * @param aDest       The value to add to.
+   * @param aValueToAdd The value to add.
+   * @param aCount      The number of times to add aValueToAdd.
+   * @return true on success, false on failure.
+   */
+  static MOZ_MUST_USE bool
+  Add(nsCSSPropertyID aProperty, StyleAnimationValue& aDest,
+      const StyleAnimationValue& aValueToAdd, uint32_t aCount) {
+    return AddWeighted(aProperty, 1.0, aDest, aCount, aValueToAdd, aDest);
+  }
+
+  /**
+   * Calculates a measure of 'distance' between two colors.
+   *
+   * @param aStartColor The start of the interval for which the distance
+   *                    should be calculated.
+   * @param aEndColor   The end of the interval for which the distance
+   *                    should be calculated.
+   * @return the result of the calculation.
+   */
+  static double ComputeColorDistance(const css::RGBAColorData& aStartColor,
+                                     const css::RGBAColorData& aEndColor);
+
+  /**
+   * Calculates a measure of 'distance' between two values.
+   *
+   * This measure of Distance is guaranteed to be proportional to
+   * portions passed to Interpolate, Add, or AddWeighted.  However, for
+   * some types of StyleAnimationValue it may not produce sensible results
+   * for paced animation.
+   *
+   * If this method succeeds, the returned distance value is guaranteed to be
+   * non-negative.
+   *
+   * @param aStartValue The start of the interval for which the distance
+   *                    should be calculated.
+   * @param aEndValue   The end of the interval for which the distance
+   *                    should be calculated.
+   * @param aStyleContext The style context to use for processing the
+   *                      translate part of transforms.
+   * @param aDistance   The result of the calculation.
+   * @return true on success, false on failure.
+   */
+  static MOZ_MUST_USE bool
+  ComputeDistance(nsCSSPropertyID aProperty,
+                  const StyleAnimationValue& aStartValue,
+                  const StyleAnimationValue& aEndValue,
+                  nsStyleContext* aStyleContext,
+                  double& aDistance);
+
+  /**
+   * Calculates an interpolated value that is the specified |aPortion| between
+   * the two given values.
+   *
+   * This really just does the following calculation:
+   *   aResultValue = (1.0 - aPortion) * aStartValue + aPortion * aEndValue
+   *
+   * @param aStartValue The value defining the start of the interval of
+   *                    interpolation.
+   * @param aEndValue   The value defining the end of the interval of
+   *                    interpolation.
+   * @param aPortion    A number in the range [0.0, 1.0] defining the
+   *                    distance of the interpolated value in the interval.
+   * @param [out] aResultValue The resulting interpolated value.
+   * @return true on success, false on failure.
+   */
+  static MOZ_MUST_USE bool
+  Interpolate(nsCSSPropertyID aProperty,
+              const StyleAnimationValue& aStartValue,
+              const StyleAnimationValue& aEndValue,
+              double aPortion,
+              StyleAnimationValue& aResultValue) {
+    return AddWeighted(aProperty, 1.0 - aPortion, aStartValue,
+                       aPortion, aEndValue, aResultValue);
+  }
+
+  /**
+   * Does the calculation:
+   *   aResultValue = aCoeff1 * aValue1 + aCoeff2 * aValue2
+   *
+   * @param [out] aResultValue The resulting interpolated value.  May be
+   *                           the same as aValue1 or aValue2.
+   * @return true on success, false on failure.
+   *
+   * NOTE: Current callers always pass aCoeff1 and aCoeff2 >= 0.  They
+   * are currently permitted to be negative; however, if, as we add
+   * support more value types types, we find that this causes
+   * difficulty, we might change this to restrict them to being
+   * positive.
+   */
+  static MOZ_MUST_USE bool
+  AddWeighted(nsCSSPropertyID aProperty,
+              double aCoeff1, const StyleAnimationValue& aValue1,
+              double aCoeff2, const StyleAnimationValue& aValue2,
+              StyleAnimationValue& aResultValue);
+
+  /**
+   * Accumulates |aValueToAccumulate| onto |aDest| |aCount| times.
+   * The result is stored in |aDest| on success.
+   *
+   * @param aDest              The base value to be accumulated.
+   * @param aValueToAccumulate The value to accumulate.
+   * @param aCount             The number of times to accumulate
+   *                           aValueToAccumulate.
+   * @return true on success, false on failure.
+   *
+   * NOTE: This function will work as a wrapper of StyleAnimationValue::Add()
+   * if |aProperty| isn't color or shadow or filter.  For these properties,
+   * this function may return a color value that at least one of its components
+   * has a value which is outside the range [0, 1] so that we can calculate
+   * plausible values as interpolation with the return value.
+   */
+  static MOZ_MUST_USE bool
+  Accumulate(nsCSSPropertyID aProperty, StyleAnimationValue& aDest,
+             const StyleAnimationValue& aValueToAccumulate,
+             uint64_t aCount);
+
+  // Type-conversion methods
+  // -----------------------
+  /**
+   * Creates a computed value for the given specified value
+   * (property ID + string).  A style context is needed in case the
+   * specified value depends on inherited style or on the values of other
+   * properties.
+   *
+   * @param aProperty       The property whose value we're computing.
+   * @param aTargetElement  The content node to which our computed value is
+   *                        applicable. For pseudo-elements, this is the parent
+   *                        element to which the pseudo is attached, not the
+   *                        generated content node.
+   * @param aStyleContext   The style context used to compute values from the
+   *                        specified value. For pseudo-elements, this should
+   *                        be the style context corresponding to the pseudo
+   *                        element.
+   * @param aSpecifiedValue The specified value, from which we'll build our
+   *                        computed value.
+   * @param aUseSVGMode     A flag to indicate whether we should parse
+   *                        |aSpecifiedValue| in SVG mode.
+   * @param [out] aComputedValue The resulting computed value.
+   * @param [out] aIsContextSensitive
+   *                        Set to true if |aSpecifiedValue| may produce
+   *                        a different |aComputedValue| depending on other CSS
+   *                        properties on |aTargetElement| or its ancestors.
+   *                        false otherwise.
+   *                        Note that the operation of this method is
+   *                        significantly faster when |aIsContextSensitive| is
+   *                        nullptr.
+   * @return true on success, false on failure.
+   */
+  static MOZ_MUST_USE bool
+  ComputeValue(nsCSSPropertyID aProperty,
+               mozilla::dom::Element* aTargetElement,
+               nsStyleContext* aStyleContext,
+               const nsAString& aSpecifiedValue,
+               bool aUseSVGMode,
+               StyleAnimationValue& aComputedValue,
+               bool* aIsContextSensitive = nullptr);
+
+  /**
+   * Like ComputeValue, but returns an array of StyleAnimationValues.
+   *
+   * On success, when aProperty is a longhand, aResult will have a single
+   * value in it.  When aProperty is a shorthand, aResult will be filled with
+   * values for all of aProperty's longhand components.  aEnabledState
+   * is used to filter the longhand components that will be appended
+   * to aResult.  On failure, aResult might still have partial results
+   * in it.
+   */
+  static MOZ_MUST_USE bool
+  ComputeValues(nsCSSPropertyID aProperty,
+                mozilla::CSSEnabledState aEnabledState,
+                mozilla::dom::Element* aTargetElement,
+                nsStyleContext* aStyleContext,
+                const nsAString& aSpecifiedValue,
+                bool aUseSVGMode,
+                nsTArray<PropertyStyleAnimationValuePair>& aResult);
+
+  /**
+   * A variant on ComputeValues that takes an nsCSSValue as the specified
+   * value. Only longhand properties are supported.
+   */
+  static MOZ_MUST_USE bool
+  ComputeValues(nsCSSPropertyID aProperty,
+                mozilla::CSSEnabledState aEnabledState,
+                mozilla::dom::Element* aTargetElement,
+                nsStyleContext* aStyleContext,
+                const nsCSSValue& aSpecifiedValue,
+                bool aUseSVGMode,
+                nsTArray<PropertyStyleAnimationValuePair>& aResult);
+
+  /**
+   * A variant of ComputeValues that takes a RawServoDeclarationBlock
+   * as the specified value.
+   */
+  static MOZ_MUST_USE bool
+  ComputeValues(nsCSSPropertyID aProperty,
+                mozilla::CSSEnabledState aEnabledState,
+                nsStyleContext* aStyleContext,
+                const RawServoDeclarationBlock& aDeclarations,
+                nsTArray<PropertyStyleAnimationValuePair>& aValues);
+
+  /**
+   * Creates a specified value for the given computed value.
+   *
+   * The first two overloads fill in an nsCSSValue object; the third
+   * produces a string.  For the overload that takes a const
+   * StyleAnimationValue& reference, the nsCSSValue result may depend on
+   * objects owned by the |aComputedValue| object, so users of that variant
+   * must keep |aComputedValue| alive longer than |aSpecifiedValue|.
+   * The overload that takes an rvalue StyleAnimationValue reference
+   * transfers ownership for some resources such that the |aComputedValue|
+   * does not depend on the lifetime of |aSpecifiedValue|.
+   *
+   * @param aProperty      The property whose value we're uncomputing.
+   * @param aComputedValue The computed value to be converted.
+   * @param [out] aSpecifiedValue The resulting specified value.
+   * @return true on success, false on failure.
+   *
+   * These functions are not MOZ_MUST_USE because failing to check the return
+   * value is common and reasonable.
+   */
+  static MOZ_MUST_USE bool
+  UncomputeValue(nsCSSPropertyID aProperty,
+                 const StyleAnimationValue& aComputedValue,
+                 nsCSSValue& aSpecifiedValue);
+  static MOZ_MUST_USE bool
+  UncomputeValue(nsCSSPropertyID aProperty,
+                 StyleAnimationValue&& aComputedValue,
+                 nsCSSValue& aSpecifiedValue);
+  static MOZ_MUST_USE bool
+  UncomputeValue(nsCSSPropertyID aProperty,
+                 const StyleAnimationValue& aComputedValue,
+                 nsAString& aSpecifiedValue);
+
+  /**
+   * Gets the computed value for the given property from the given style
+   * context.
+   *
+   * Obtaining the computed value allows us to animate properties when the
+   * content author has specified a value like "inherit" or "initial" or some
+   * other keyword that isn't directly interpolatable, but which *computes* to
+   * something interpolatable.
+   *
+   * @param aProperty     The property whose value we're looking up.
+   * @param aStyleContext The style context to check for the computed value.
+   * @param [out] aComputedValue The resulting computed value.
+   * @return true on success, false on failure.
+   */
+  static MOZ_MUST_USE bool ExtractComputedValue(
+    nsCSSPropertyID aProperty,
+    nsStyleContext* aStyleContext,
+    StyleAnimationValue& aComputedValue);
+
+  /**
+   * Interpolates between 2 matrices by decomposing them.
+   *
+   * @param aMatrix1   First matrix, using CSS pixel units.
+   * @param aMatrix2   Second matrix, using CSS pixel units.
+   * @param aProgress  Interpolation value in the range [0.0, 1.0]
+   */
+  static gfx::Matrix4x4 InterpolateTransformMatrix(const gfx::Matrix4x4 &aMatrix1,
+                                                   const gfx::Matrix4x4 &aMatrix2,
+                                                   double aProgress);
+
+  static already_AddRefed<nsCSSValue::Array>
+    AppendTransformFunction(nsCSSKeyword aTransformFunction,
+                            nsCSSValueList**& aListTail);
+
+  /**
+   * The types and values for the values that we extract and animate.
+   */
+  enum Unit {
+    eUnit_Null, // not initialized
+    eUnit_Normal,
+    eUnit_Auto,
+    eUnit_None,
+    eUnit_Enumerated,
+    eUnit_Visibility, // special case for transitions (which converts
+                      // Enumerated to Visibility as needed)
+    eUnit_Integer,
+    eUnit_Coord,
+    eUnit_Percent,
+    eUnit_Float,
+    eUnit_Color, // nsCSSValue* (never null), always with an nscolor or
+                 // an nsCSSValueFloatColor
+    eUnit_CurrentColor,
+    eUnit_ComplexColor, // ComplexColorValue* (never null)
+    eUnit_Calc, // nsCSSValue* (never null), always with a single
+                // calc() expression that's either length or length+percent
+    eUnit_ObjectPosition, // nsCSSValue* (never null), always with a
+                          // 4-entry nsCSSValue::Array
+    eUnit_URL, // nsCSSValue* (never null), always with a css::URLValue
+    eUnit_DiscreteCSSValue, // nsCSSValue* (never null)
+    eUnit_CSSValuePair, // nsCSSValuePair* (never null)
+    eUnit_CSSValueTriplet, // nsCSSValueTriplet* (never null)
+    eUnit_CSSRect, // nsCSSRect* (never null)
+    eUnit_Dasharray, // nsCSSValueList* (never null)
+    eUnit_Shadow, // nsCSSValueList* (may be null)
+    eUnit_Shape,  // nsCSSValue::Array* (never null)
+    eUnit_Filter, // nsCSSValueList* (may be null)
+    eUnit_Transform, // nsCSSValueList* (never null)
+    eUnit_BackgroundPositionCoord, // nsCSSValueList* (never null)
+    eUnit_CSSValuePairList, // nsCSSValuePairList* (never null)
+    eUnit_UnparsedString // nsStringBuffer* (never null)
+  };
+
+private:
+  Unit mUnit;
+  union {
+    int32_t mInt;
+    nscoord mCoord;
+    float mFloat;
+    nsCSSValue* mCSSValue;
+    nsCSSValuePair* mCSSValuePair;
+    nsCSSValueTriplet* mCSSValueTriplet;
+    nsCSSRect* mCSSRect;
+    nsCSSValue::Array* mCSSValueArray;
+    nsCSSValueList* mCSSValueList;
+    nsCSSValueSharedList* mCSSValueSharedList;
+    nsCSSValuePairList* mCSSValuePairList;
+    nsStringBuffer* mString;
+    css::ComplexColorValue* mComplexColor;
+  } mValue;
+
+public:
+  Unit GetUnit() const {
+    NS_ASSERTION(mUnit != eUnit_Null, "uninitialized");
+    return mUnit;
+  }
+
+  // Accessor to let us verify assumptions about presence of null unit,
+  // without tripping the assertion in GetUnit().
+  bool IsNull() const {
+    return mUnit == eUnit_Null;
+  }
+
+  int32_t GetIntValue() const {
+    NS_ASSERTION(IsIntUnit(mUnit), "unit mismatch");
+    return mValue.mInt;
+  }
+  nscoord GetCoordValue() const {
+    NS_ASSERTION(mUnit == eUnit_Coord, "unit mismatch");
+    return mValue.mCoord;
+  }
+  float GetPercentValue() const {
+    NS_ASSERTION(mUnit == eUnit_Percent, "unit mismatch");
+    return mValue.mFloat;
+  }
+  float GetFloatValue() const {
+    NS_ASSERTION(mUnit == eUnit_Float, "unit mismatch");
+    return mValue.mFloat;
+  }
+  nsCSSValue* GetCSSValueValue() const {
+    NS_ASSERTION(IsCSSValueUnit(mUnit), "unit mismatch");
+    return mValue.mCSSValue;
+  }
+  nsCSSValuePair* GetCSSValuePairValue() const {
+    NS_ASSERTION(IsCSSValuePairUnit(mUnit), "unit mismatch");
+    return mValue.mCSSValuePair;
+  }
+  nsCSSValueTriplet* GetCSSValueTripletValue() const {
+    NS_ASSERTION(IsCSSValueTripletUnit(mUnit), "unit mismatch");
+    return mValue.mCSSValueTriplet;
+  }
+  nsCSSRect* GetCSSRectValue() const {
+    NS_ASSERTION(IsCSSRectUnit(mUnit), "unit mismatch");
+    return mValue.mCSSRect;
+  }
+  nsCSSValue::Array* GetCSSValueArrayValue() const {
+    NS_ASSERTION(IsCSSValueArrayUnit(mUnit), "unit mismatch");
+    return mValue.mCSSValueArray;
+  }
+  nsCSSValueList* GetCSSValueListValue() const {
+    NS_ASSERTION(IsCSSValueListUnit(mUnit), "unit mismatch");
+    return mValue.mCSSValueList;
+  }
+  nsCSSValueSharedList* GetCSSValueSharedListValue() const {
+    NS_ASSERTION(IsCSSValueSharedListValue(mUnit), "unit mismatch");
+    return mValue.mCSSValueSharedList;
+  }
+  nsCSSValuePairList* GetCSSValuePairListValue() const {
+    NS_ASSERTION(IsCSSValuePairListUnit(mUnit), "unit mismatch");
+    return mValue.mCSSValuePairList;
+  }
+  const char16_t* GetStringBufferValue() const {
+    NS_ASSERTION(IsStringUnit(mUnit), "unit mismatch");
+    return GetBufferValue(mValue.mString);
+  }
+
+  void GetStringValue(nsAString& aBuffer) const {
+    NS_ASSERTION(IsStringUnit(mUnit), "unit mismatch");
+    aBuffer.Truncate();
+    uint32_t len = NS_strlen(GetBufferValue(mValue.mString));
+    mValue.mString->ToString(len, aBuffer);
+  }
+
+  /// @return the scale for this value, calculated with reference to @aForFrame.
+  gfxSize GetScaleValue(const nsIFrame* aForFrame) const;
+
+  const css::ComplexColorData& GetComplexColorData() const {
+    MOZ_ASSERT(mUnit == eUnit_ComplexColor, "unit mismatch");
+    return *mValue.mComplexColor;
+  }
+  StyleComplexColor GetStyleComplexColorValue() const {
+    return GetComplexColorData().ToComplexColor();
+  }
+
+  UniquePtr<nsCSSValueList> TakeCSSValueListValue() {
+    nsCSSValueList* list = GetCSSValueListValue();
+    mValue.mCSSValueList = nullptr;
+    mUnit = eUnit_Null;
+    return UniquePtr<nsCSSValueList>(list);
+  }
+  UniquePtr<nsCSSValuePairList> TakeCSSValuePairListValue() {
+    nsCSSValuePairList* list = GetCSSValuePairListValue();
+    mValue.mCSSValuePairList = nullptr;
+    mUnit = eUnit_Null;
+    return UniquePtr<nsCSSValuePairList>(list);
+  }
+
+  explicit StyleAnimationValue(Unit aUnit = eUnit_Null) : mUnit(aUnit) {
+    NS_ASSERTION(aUnit == eUnit_Null || aUnit == eUnit_Normal ||
+                 aUnit == eUnit_Auto || aUnit == eUnit_None,
+                 "must be valueless unit");
+  }
+  StyleAnimationValue(const StyleAnimationValue& aOther)
+    : mUnit(eUnit_Null) { *this = aOther; }
+  StyleAnimationValue(StyleAnimationValue&& aOther)
+    : mUnit(aOther.mUnit)
+    , mValue(aOther.mValue)
+  {
+    aOther.mUnit = eUnit_Null;
+  }
+  enum IntegerConstructorType { IntegerConstructor };
+  StyleAnimationValue(int32_t aInt, Unit aUnit, IntegerConstructorType);
+  enum CoordConstructorType { CoordConstructor };
+  StyleAnimationValue(nscoord aLength, CoordConstructorType);
+  enum PercentConstructorType { PercentConstructor };
+  StyleAnimationValue(float aPercent, PercentConstructorType);
+  enum FloatConstructorType { FloatConstructor };
+  StyleAnimationValue(float aFloat, FloatConstructorType);
+  enum ColorConstructorType { ColorConstructor };
+  StyleAnimationValue(nscolor aColor, ColorConstructorType);
+
+  ~StyleAnimationValue() { FreeValue(); }
+
+  void SetNormalValue();
+  void SetAutoValue();
+  void SetNoneValue();
+  void SetIntValue(int32_t aInt, Unit aUnit);
+  template<typename T,
+           typename = typename std::enable_if<std::is_enum<T>::value>::type>
+  void SetIntValue(T aInt, Unit aUnit)
+  {
+    static_assert(mozilla::EnumTypeFitsWithin<T, int32_t>::value,
+                  "aValue must be an enum that fits within mValue.mInt");
+    SetIntValue(static_cast<int32_t>(aInt), aUnit);
+  }
+  void SetCoordValue(nscoord aCoord);
+  void SetPercentValue(float aPercent);
+  void SetFloatValue(float aFloat);
+  void SetColorValue(nscolor aColor);
+  void SetCurrentColorValue();
+  void SetComplexColorValue(const StyleComplexColor& aColor);
+  void SetComplexColorValue(already_AddRefed<css::ComplexColorValue> aValue);
+  void SetUnparsedStringValue(const nsString& aString);
+  void SetCSSValueArrayValue(nsCSSValue::Array* aValue, Unit aUnit);
+
+  // These setters take ownership of |aValue|, and are therefore named
+  // "SetAndAdopt*".
+  void SetAndAdoptCSSValueValue(nsCSSValue *aValue, Unit aUnit);
+  void SetAndAdoptCSSValuePairValue(nsCSSValuePair *aValue, Unit aUnit);
+  void SetAndAdoptCSSValueTripletValue(nsCSSValueTriplet *aValue, Unit aUnit);
+  void SetAndAdoptCSSRectValue(nsCSSRect *aValue, Unit aUnit);
+  void SetAndAdoptCSSValueListValue(nsCSSValueList *aValue, Unit aUnit);
+  void SetAndAdoptCSSValuePairListValue(nsCSSValuePairList *aValue);
+
+  void SetTransformValue(nsCSSValueSharedList* aList);
+
+  StyleAnimationValue& operator=(const StyleAnimationValue& aOther);
+  StyleAnimationValue& operator=(StyleAnimationValue&& aOther)
+  {
+    MOZ_ASSERT(this != &aOther, "Do not move itself");
+    if (this != &aOther) {
+      FreeValue();
+      mUnit = aOther.mUnit;
+      mValue = aOther.mValue;
+      aOther.mUnit = eUnit_Null;
+    }
+    return *this;
+  }
+
+  bool operator==(const StyleAnimationValue& aOther) const;
+  bool operator!=(const StyleAnimationValue& aOther) const
+    { return !(*this == aOther); }
+
+private:
+  void FreeValue();
+
+  static const char16_t* GetBufferValue(nsStringBuffer* aBuffer) {
+    return static_cast<char16_t*>(aBuffer->Data());
+  }
+
+  static bool IsIntUnit(Unit aUnit) {
+    return aUnit == eUnit_Enumerated || aUnit == eUnit_Visibility ||
+           aUnit == eUnit_Integer;
+  }
+  static bool IsCSSValueUnit(Unit aUnit) {
+    return aUnit == eUnit_Color ||
+           aUnit == eUnit_Calc ||
+           aUnit == eUnit_ObjectPosition ||
+           aUnit == eUnit_URL ||
+           aUnit == eUnit_DiscreteCSSValue;
+  }
+  static bool IsCSSValuePairUnit(Unit aUnit) {
+    return aUnit == eUnit_CSSValuePair;
+  }
+  static bool IsCSSValueTripletUnit(Unit aUnit) {
+    return aUnit == eUnit_CSSValueTriplet;
+  }
+  static bool IsCSSRectUnit(Unit aUnit) {
+    return aUnit == eUnit_CSSRect;
+  }
+  static bool IsCSSValueArrayUnit(Unit aUnit) {
+    return aUnit == eUnit_Shape;
+  }
+  static bool IsCSSValueListUnit(Unit aUnit) {
+    return aUnit == eUnit_Dasharray || aUnit == eUnit_Filter ||
+           aUnit == eUnit_Shadow ||
+           aUnit == eUnit_BackgroundPositionCoord;
+  }
+  static bool IsCSSValueSharedListValue(Unit aUnit) {
+    return aUnit == eUnit_Transform;
+  }
+  static bool IsCSSValuePairListUnit(Unit aUnit) {
+    return aUnit == eUnit_CSSValuePairList;
+  }
+  static bool IsStringUnit(Unit aUnit) {
+    return aUnit == eUnit_UnparsedString;
+  }
+};
+
+struct PropertyStyleAnimationValuePair
+{
+  nsCSSPropertyID mProperty;
+  StyleAnimationValue mValue;
+};
+} // namespace mozilla
+
+#endif