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/* -*- 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_KeyframeEffect_h

#define mozilla_dom_KeyframeEffect_h

#include "nsChangeHint.h"

#include "nsCSSPropertyID.h"

#include "nsCSSPropertyIDSet.h"

#include "nsCSSValue.h"

#include "nsCycleCollectionParticipant.h"

#include "nsRefPtrHashtable.h"

#include "nsTArray.h"

#include "nsWrapperCache.h"

#include "mozilla/AnimatedPropertyID.h"

#include "mozilla/AnimatedPropertyIDSet.h"

#include "mozilla/AnimationPerformanceWarning.h"

#include "mozilla/AnimationPropertySegment.h"

#include "mozilla/AnimationTarget.h"

#include "mozilla/Attributes.h"

#include "mozilla/EffectCompositor.h"

#include "mozilla/Keyframe.h"

#include "mozilla/KeyframeEffectParams.h"

#include "mozilla/PostRestyleMode.h"

// StyleLockedDeclarationBlock and associated RefPtrTraits

#include "mozilla/ServoBindingTypes.h"

#include "mozilla/StyleAnimationValue.h"

#include "mozilla/dom/AnimationEffect.h"

#include "mozilla/dom/BindingDeclarations.h"

struct JSContext;

class JSObject;

class nsIContent;

class nsIFrame;

namespace mozilla {

class AnimValuesStyleRule;

class ErrorResult;

struct AnimationRule;

struct TimingParams;

class EffectSet;

class ComputedStyle;

class PresShell;

namespace dom {

class Element;

class GlobalObject;

class UnrestrictedDoubleOrKeyframeAnimationOptions;

class UnrestrictedDoubleOrKeyframeEffectOptions;

enum class IterationCompositeOperation : uint8_t;

enum class CompositeOperation : uint8_t;

struct AnimationPropertyDetails;

}  // namespace dom

struct AnimationProperty {

  AnimatedPropertyID mProperty;

  // If true, the propery is currently being animated on the compositor.

//

  // Note that when the owning Animation requests a non-throttled restyle, in

  // between calling RequestRestyle on its EffectCompositor and when the

  // restyle is performed, this member may temporarily become false even if

  // the animation remains on the layer after the restyle.

//

  // **NOTE**: This member is not included when comparing AnimationProperty

  // objects for equality.

  bool mIsRunningOnCompositor = false;

  Maybe<AnimationPerformanceWarning> mPerformanceWarning;

  nsTArray<AnimationPropertySegment> mSegments;

  // The copy constructor/assignment doesn't copy mIsRunningOnCompositor and

  // mPerformanceWarning.

  AnimationProperty() : mProperty(eCSSProperty_UNKNOWN) {};

  AnimationProperty(const AnimationProperty& aOther)

      : mProperty(aOther.mProperty), mSegments(aOther.mSegments.Clone()) {}

  AnimationProperty& operator=(const AnimationProperty& aOther) {

    mProperty = aOther.mProperty;

    mSegments = aOther.mSegments.Clone();

    return *this;

  // NOTE: This operator does *not* compare the mIsRunningOnCompositor member.

  // This is because AnimationProperty objects are compared when recreating

  // CSS animations to determine if mutation observer change records need to

  // be created or not. However, at the point when these objects are compared

  // the mIsRunningOnCompositor will not have been set on the new objects so

  // we ignore this member to avoid generating spurious change records.

  bool operator==(const AnimationProperty& aOther) const {

    return mProperty == aOther.mProperty && mSegments == aOther.mSegments;

  bool operator!=(const AnimationProperty& aOther) const {

    return !(*this == aOther);

  void SetPerformanceWarning(const AnimationPerformanceWarning& aWarning,

                             const dom::Element* aElement);

};

namespace dom {

class Animation;

class Document;

class KeyframeEffect : public AnimationEffect {

 public:

  KeyframeEffect(Document* aDocument, OwningAnimationTarget&& aTarget,

                 TimingParams&& aTiming, const KeyframeEffectParams& aOptions);

  KeyframeEffect(Document* aDocument, OwningAnimationTarget&& aTarget,

                 const KeyframeEffect& aOther);

  NS_DECL_ISUPPORTS_INHERITED

  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(KeyframeEffect,

                                                         AnimationEffect)

  virtual JSObject* WrapObject(JSContext* aCx,

                               JS::Handle<JSObject*> aGivenProto) override;

  KeyframeEffect* AsKeyframeEffect() override { return this; }

  bool IsValidTransition() const {

    return Properties().Length() == 1 &&

           Properties()[0].mSegments.Length() == 1;

  // KeyframeEffect interface

  static already_AddRefed<KeyframeEffect> Constructor(

      const GlobalObject& aGlobal, Element* aTarget,

      JS::Handle<JSObject*> aKeyframes,

      const UnrestrictedDoubleOrKeyframeEffectOptions& aOptions,

      ErrorResult& aRv);

  static already_AddRefed<KeyframeEffect> Constructor(

      const GlobalObject& aGlobal, KeyframeEffect& aSource, ErrorResult& aRv);

  // Variant of Constructor that accepts a KeyframeAnimationOptions object

  // for use with for Animatable.animate.

  // Not exposed to content.

  static already_AddRefed<KeyframeEffect> Constructor(

      const GlobalObject& aGlobal, Element* aTarget,

      JS::Handle<JSObject*> aKeyframes,

      const UnrestrictedDoubleOrKeyframeAnimationOptions& aOptions,

      ErrorResult& aRv);

  Element* GetTarget() const { return mTarget.mElement.get(); }

  NonOwningAnimationTarget GetAnimationTarget() const {

    return NonOwningAnimationTarget(mTarget.mElement, mTarget.mPseudoRequest);

  void GetPseudoElement(nsAString& aRetVal) const {

    if (mTarget.mPseudoRequest.IsNotPseudo()) {

      SetDOMStringToNull(aRetVal);

      return;

    aRetVal =

        nsCSSPseudoElements::PseudoRequestAsString(mTarget.mPseudoRequest);

  // These two setters call GetTargetComputedStyle which is not safe to use when

  // we are in the middle of updating style. If we need to use this when

  // updating style, we should pass the ComputedStyle into this method and use

  // that to update the properties rather than calling

  // GetComputedStyle.

  void SetTarget(Element* aTarget) {

    UpdateTarget(aTarget, mTarget.mPseudoRequest);

  void SetPseudoElement(const nsAString& aPseudoElement, ErrorResult& aRv);

  void GetKeyframes(JSContext* aCx, nsTArray<JSObject*>& aResult,

                    ErrorResult& aRv) const;

  void GetProperties(nsTArray<AnimationPropertyDetails>& aProperties,

                     ErrorResult& aRv) const;

  IterationCompositeOperation IterationComposite() const;

  void SetIterationComposite(

      const IterationCompositeOperation& aIterationComposite);

  CompositeOperation Composite() const;

  virtual void SetComposite(const CompositeOperation& aComposite);

  void SetCompositeFromStyle(const CompositeOperation& aComposite) {

    KeyframeEffect::SetComposite(aComposite);

  void NotifySpecifiedTimingUpdated();

  void NotifyAnimationTimingUpdated(PostRestyleMode aPostRestyle);

  void RequestRestyle(EffectCompositor::RestyleType aRestyleType);

  void SetAnimation(Animation* aAnimation) override;

  virtual void SetKeyframes(JSContext* aContext,

                            JS::Handle<JSObject*> aKeyframes, ErrorResult& aRv);

  void SetKeyframes(nsTArray<Keyframe>&& aKeyframes,

                    const ComputedStyle* aStyle,

                    const AnimationTimeline* aTimeline);

  // Replace the start value of the transition. This is used for updating

  // transitions running on the compositor.

  void ReplaceTransitionStartValue(AnimationValue&& aStartValue);

  // Returns the set of properties affected by this effect regardless of

  // whether any of these properties is overridden by an !important rule.

  AnimatedPropertyIDSet GetPropertySet() const;

  // Returns true if the effect includes a property in |aPropertySet| regardless

  // of whether any property in the set is overridden by an !important rule.

  bool HasAnimationOfPropertySet(const nsCSSPropertyIDSet& aPropertySet) const {

    return GetPropertySet().Intersects(aPropertySet);

  // GetEffectiveAnimationOfProperty returns AnimationProperty corresponding

  // to a given CSS property if the effect includes the property and the

  // property is not overridden by !important rules.

  // Also EffectiveAnimationOfProperty returns true under the same condition.

//

  // |aEffect| should be the EffectSet containing this KeyframeEffect since

  // this function is typically called for all KeyframeEffects on an element

  // so that we can avoid multiple calls of EffectSet::GetEffect().

//

  // Note that does not consider the interaction between related transform

  // properties where an !important rule on another transform property may

  // cause all transform properties to be run on the main thread. That check is

  // performed by GetPropertiesForCompositor.

  bool HasEffectiveAnimationOfProperty(const AnimatedPropertyID& aProperty,

                                       const EffectSet& aEffect) const {

    return GetEffectiveAnimationOfProperty(aProperty, aEffect) != nullptr;

  const AnimationProperty* GetEffectiveAnimationOfProperty(

      const AnimatedPropertyID&, const EffectSet&) const;

  // Similar to HasEffectiveAnimationOfProperty, above, but for

  // an nsCSSPropertyIDSet. Returns true if this keyframe effect has at least

  // one property in |aPropertySet| that is not overridden by an !important

  // rule.

//

  // Note that does not consider the interaction between related transform

  // properties where an !important rule on another transform property may

  // cause all transform properties to be run on the main thread. That check is

  // performed by GetPropertiesForCompositor.

  bool HasEffectiveAnimationOfPropertySet(

      const nsCSSPropertyIDSet& aPropertySet,

      const EffectSet& aEffectSet) const;

  // Returns all the effective animated CSS properties that can be animated on

  // the compositor and are not overridden by a higher cascade level.

//

  // NOTE: This function is basically called for all KeyframeEffects on an

  // element thus it takes |aEffects| to avoid multiple calls of

  // EffectSet::GetEffect().

//

  // NOTE(2): This function does NOT check that animations are permitted on

  // |aFrame|. It is the responsibility of the caller to first call

  // EffectCompositor::AllowCompositorAnimationsOnFrame for |aFrame|, or use

  // nsLayoutUtils::GetAnimationPropertiesForCompositor instead.

  nsCSSPropertyIDSet GetPropertiesForCompositor(EffectSet& aEffects,

                                                const nsIFrame* aFrame) const;

  const nsTArray<AnimationProperty>& Properties() const { return mProperties; }

  // Update |mProperties| by recalculating from |mKeyframes| using

  // |aComputedStyle| to resolve specified values.

  // Note: we use |aTimeline| to check if we need to ensure the base styles.

  // If it is nullptr, we use the timeline from |mAnimation|.

  void UpdateProperties(const ComputedStyle* aStyle,

                        const AnimationTimeline* aTimeline = nullptr);

  // Update various bits of state related to running ComposeStyle().

  // We need to update this outside ComposeStyle() because we should avoid

  // mutating any state in ComposeStyle() since it might be called during

  // parallel traversal.

  void WillComposeStyle();

  // Updates |aComposeResult| with the animation values produced by this

  // AnimationEffect for the current time except any properties contained

  // in |aPropertiesToSkip|.

  void ComposeStyle(StyleAnimationValueMap& aComposeResult,

                    const InvertibleAnimatedPropertyIDSet& aPropertiesToSkip);

  // Returns true if at least one property is being animated on compositor.

  bool IsRunningOnCompositor() const;

  void SetIsRunningOnCompositor(nsCSSPropertyID aProperty, bool aIsRunning);

  void SetIsRunningOnCompositor(const nsCSSPropertyIDSet& aPropertySet,

                                bool aIsRunning);

  void ResetIsRunningOnCompositor();

  void ResetPartialPrerendered();

  // Returns true if this effect, applied to |aFrame|, contains properties

  // that mean we shouldn't run transform compositor animations on this element.

//

  // For example, if we have an animation of geometric properties like 'left'

  // and 'top' on an element, we force all 'transform' animations running at

  // the same time on the same element to run on the main thread.

//

  // When returning true, |aPerformanceWarning| stores the reason why

  // we shouldn't run the transform animations.

  bool ShouldBlockAsyncTransformAnimations(

      const nsIFrame* aFrame, const nsCSSPropertyIDSet& aPropertySet,

      AnimationPerformanceWarning::Type& aPerformanceWarning /* out */) const;

  bool HasGeometricProperties() const;

  bool AffectsGeometry() const override {

    return mTarget && HasGeometricProperties();

  Document* GetRenderedDocument() const;

  PresShell* GetPresShell() const;

  // Associates a warning with the animated property set on the specified frame

  // indicating why, for example, the property could not be animated on the

  // compositor. |aParams| and |aParamsLength| are optional parameters which

  // will be used to generate a localized message for devtools.

  void SetPerformanceWarning(const nsCSSPropertyIDSet& aPropertySet,

                             const AnimationPerformanceWarning& aWarning);

  // Cumulative change hint on each segment for each property.

  // This is used for deciding the animation is paint-only.

  void CalculateCumulativeChangesForProperty(const AnimationProperty&);

  // Returns true if all of animation properties' change hints

  // can ignore painting if the animation is not visible.

  // See nsChangeHint_Hints_CanIgnoreIfNotVisible in nsChangeHint.h

  // in detail which change hint can be ignored.

  bool CanIgnoreIfNotVisible() const;

  // Returns true if the effect is current state and has scale animation.

  // |aFrame| is used for calculation of scale values.

  bool ContainsAnimatedScale(const nsIFrame* aFrame) const;

  AnimationValue BaseStyle(const AnimatedPropertyID& aProperty) const {

    AnimationValue result;

    bool hasProperty = false;

    // We cannot use getters_AddRefs on StyleAnimationValue because it is

    // an incomplete type, so Get() doesn't work. Instead, use GetWeak, and

    // then assign the raw pointer to a RefPtr.

    result.mServo = mBaseValues.GetWeak(aProperty, &hasProperty);

    MOZ_ASSERT(hasProperty || result.IsNull());

    return result;

  enum class MatchForCompositor {

    // This animation matches and should run on the compositor if possible.

    Yes,

    // This (not currently playing) animation matches and can be run on the

    // compositor if there are other animations for this property that return

    // 'Yes'.

    IfNeeded,

    // This animation does not match or can't be run on the compositor.

No,

    // This animation does not match or can't be run on the compositor and,

    // furthermore, its presence means we should not run any animations for this

    // property on the compositor.

    NoAndBlockThisProperty

};

  MatchForCompositor IsMatchForCompositor(

      const nsCSSPropertyIDSet& aPropertySet, const nsIFrame* aFrame,

      const EffectSet& aEffects,

      AnimationPerformanceWarning::Type& aPerformanceWarning /* out */) const;

  static bool HasComputedTimingChanged(

      const ComputedTiming& aComputedTiming,

      IterationCompositeOperation aIterationComposite,

      const Nullable<double>& aProgressOnLastCompose,

      uint64_t aCurrentIterationOnLastCompose);

  bool HasOpacityChange() const { return mCumulativeChanges.mOpacity; }

 protected:

  ~KeyframeEffect() override = default;

  template <class OptionsType>

  static already_AddRefed<KeyframeEffect> ConstructKeyframeEffect(

      const GlobalObject& aGlobal, Element* aTarget,

      JS::Handle<JSObject*> aKeyframes, const OptionsType& aOptions,

      ErrorResult& aRv);

  // Build properties by recalculating from |mKeyframes| using |aComputedStyle|

  // to resolve specified values. This function also applies paced spacing if

  // needed.

  nsTArray<AnimationProperty> BuildProperties(const ComputedStyle* aStyle);

  // Helper for SetTarget() and SetPseudoElement().

  void UpdateTarget(Element* aElement,

                    const PseudoStyleRequest& aPseudoRequest);

  // This effect is registered with its target element so long as:

//

  // (a) It has a target element, and

  // (b) It is "relevant" (i.e. yet to finish but not idle, or finished but

  //     filling forwards)

//

  // As a result, we need to make sure this gets called whenever anything

  // changes with regards to this effects's timing including changes to the

  // owning Animation's timing.

  void UpdateTargetRegistration();

  // Remove the current effect target from its EffectSet.

  void UnregisterTarget();

  // Looks up the ComputedStyle associated with the target element, if any.

  // We need to be careful to *not* call this when we are updating the style

  // context. That's because calling GetComputedStyle when we are in the process

  // of building a ComputedStyle may trigger various forms of infinite

  // recursion.

  enum class Flush {

    Style,

    None,

};

  already_AddRefed<const ComputedStyle> GetTargetComputedStyle(Flush) const;

  // A wrapper for marking cascade update according to the current

  // target and its effectSet.

  void MarkCascadeNeedsUpdate();

  void EnsureBaseStyles(const ComputedStyle* aComputedValues,

                        const nsTArray<AnimationProperty>& aProperties,

                        const AnimationTimeline* aTimeline,

                        bool* aBaseStylesChanged);

  void EnsureBaseStyle(const AnimationProperty& aProperty,

                       nsPresContext* aPresContext,

                       const ComputedStyle* aComputedValues,

                       const AnimationTimeline* aTimeline,

                       RefPtr<const ComputedStyle>& aBaseComputedValues);

  OwningAnimationTarget mTarget;

  KeyframeEffectParams mEffectOptions;

  // The specified keyframes.

  nsTArray<Keyframe> mKeyframes;

  // A set of per-property value arrays, derived from |mKeyframes|.

  nsTArray<AnimationProperty> mProperties;

  // The computed progress last time we composed the style rule. This is

  // used to detect when the progress is not changing (e.g. due to a step

  // timing function) so we can avoid unnecessary style updates.

  Nullable<double> mProgressOnLastCompose;

  // The purpose of this value is the same as mProgressOnLastCompose but

  // this is used to detect when the current iteration is not changing

  // in the case when iterationComposite is accumulate.

  uint64_t mCurrentIterationOnLastCompose = 0;

  // We need to track when we go to or from being "in effect" since

  // we need to re-evaluate the cascade of animations when that changes.

  bool mInEffectOnLastAnimationTimingUpdate = false;

  // True if this effect is in the EffectSet for its target element. This is

  // used as an optimization to avoid unnecessary hashmap lookups on the

  // EffectSet.

  bool mInEffectSet = false;

  // The non-animated values for properties in this effect that contain at

  // least one animation value that is composited with the underlying value

  // (i.e. it uses the additive or accumulate composite mode).

  using BaseValuesHashmap =

      nsRefPtrHashtable<nsGenericHashKey<AnimatedPropertyID>,

                        StyleAnimationValue>;

  BaseValuesHashmap mBaseValues;

 private:

  // The cumulative changes of all the animation segments.

  struct CumulativeChanges {

    // Whether the opacity property is changing.

    bool mOpacity : 1;

    // Whether the visibility property is changing.

    bool mVisibility : 1;

    // Whether layout is changing.

    bool mLayout : 1;

    // Whether overflow is changing.

    bool mOverflow : 1;

    // True if there is any current-color for background color.

    bool mHasBackgroundColorCurrentColor : 1;

    CumulativeChanges()

        : mOpacity(false),

          mVisibility(false),

          mLayout(false),

          mOverflow(false),

          mHasBackgroundColorCurrentColor(false) {}

};

  CumulativeChanges mCumulativeChanges;

  void ComposeStyleRule(StyleAnimationValueMap& aAnimationValues,

                        const AnimationProperty& aProperty,

                        const AnimationPropertySegment& aSegment,

                        const ComputedTiming& aComputedTiming);

  already_AddRefed<const ComputedStyle> CreateComputedStyleForAnimationValue(

      nsCSSPropertyID aProperty, const AnimationValue& aValue,

      nsPresContext* aPresContext, const ComputedStyle* aBaseComputedStyle);

  // Return the primary frame for the target (pseudo-)element.

  nsIFrame* GetPrimaryFrame() const;

  // Returns the frame which is used for styling.

  nsIFrame* GetStyleFrame() const;

  bool CanThrottle() const;

  bool CanThrottleOverflowChanges(const nsIFrame& aFrame) const;

  bool CanThrottleOverflowChangesInScrollable(nsIFrame& aFrame) const;

  bool CanThrottleIfNotVisible(nsIFrame& aFrame) const;

  // Returns true if the computedTiming has changed since the last

  // composition.

  bool HasComputedTimingChanged() const;

  // Returns true unless Gecko limitations prevent performing transform

  // animations for |aFrame|. When returning true, the reason for the

  // limitation is stored in |aOutPerformanceWarning|.

  static bool CanAnimateTransformOnCompositor(

      const nsIFrame* aFrame,

      AnimationPerformanceWarning::Type& aPerformanceWarning /* out */);

  static bool IsGeometricProperty(const nsCSSPropertyID aProperty);

  static const TimeDuration OverflowRegionRefreshInterval();

  void UpdateEffectSet(mozilla::EffectSet* aEffectSet = nullptr) const;

  // Returns true if this effect has properties that might affect the overflow

  // region.

  // This function is used for updating scroll bars or notifying intersection

  // observers reflected by the transform.

  bool HasPropertiesThatMightAffectOverflow() const {

    return mCumulativeChanges.mOverflow;

  // Returns true if this effect causes visibility change.

  // (i.e. 'visibility: hidden' -> 'visibility: visible' and vice versa.)

  bool HasVisibilityChange() const { return mCumulativeChanges.mVisibility; }

};

}  // namespace dom

}  // namespace mozilla

#endif  // mozilla_dom_KeyframeEffect_h