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+/* -*- 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
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