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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 */
#ifndef mozilla_dom_AnimationUtils_h
#define mozilla_dom_AnimationUtils_h
#include "mozilla/PseudoStyleType.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/dom/Nullable.h"
#include "nsRFPService.h"
#include "nsStringFwd.h"
class nsIContent;
class nsIFrame;
struct JSContext;
namespace mozilla {
class EffectSet;
namespace dom {
class Document;
class Element;
} // namespace dom
class AnimationUtils {
using Document = dom::Document;
static dom::Nullable<double> TimeDurationToDouble(
const dom::Nullable<TimeDuration>& aTime, RTPCallerType aRTPCallerType) {
dom::Nullable<double> result;
if (!aTime.IsNull()) {
// 0 is an inappropriate mixin for this this area; however CSS Animations
// needs to have it's Time Reduction Logic refactored, so it's currently
// only clamping for RFP mode. RFP mode gives a much lower time precision,
// so we accept the security leak here for now
aTime.Value().ToMilliseconds(), 0, aRTPCallerType));
return result;
static dom::Nullable<TimeDuration> DoubleToTimeDuration(
const dom::Nullable<double>& aTime) {
dom::Nullable<TimeDuration> result;
if (!aTime.IsNull()) {
return result;
static void LogAsyncAnimationFailure(nsCString& aMessage,
const nsIContent* aContent = nullptr);
* Get the document from the JS context to use when parsing CSS properties.
static Document* GetCurrentRealmDocument(JSContext* aCx);
* Get the document from the global object, or nullptr if the document has
* no window, to use when constructing DOM object without entering the
* target window's compartment (see KeyframeEffect constructor).
static Document* GetDocumentFromGlobal(JSObject* aGlobalObject);
* Returns true if the given frame has an animated scale.
static bool FrameHasAnimatedScale(const nsIFrame* aFrame);
* Returns true if the given (pseudo-)element has any transitions that are
* current (playing or waiting to play) or in effect (e.g. filling forwards).
static bool HasCurrentTransitions(const dom::Element* aElement,
PseudoStyleType aPseudoType);
* Returns true if this pseudo style type is supported by animations.
* Note: This doesn't include PseudoStyleType::NotPseudo.
static bool IsSupportedPseudoForAnimations(PseudoStyleType aType) {
// FIXME: Bug 1615469: Support first-line and first-letter for Animation.
return aType == PseudoStyleType::before ||
aType == PseudoStyleType::after || aType == PseudoStyleType::marker;
* Returns true if the difference between |aFirst| and |aSecond| is within
* the animation time tolerance (i.e. 1 microsecond).
static bool IsWithinAnimationTimeTolerance(const TimeDuration& aFirst,
const TimeDuration& aSecond) {
if (aFirst == TimeDuration::Forever() ||
aSecond == TimeDuration::Forever()) {
return aFirst == aSecond;
TimeDuration diff = aFirst >= aSecond ? aFirst - aSecond : aSecond - aFirst;
return diff <= TimeDuration::FromMicroseconds(1);
// Returns the target element for restyling.
// If |aPseudoType| is ::after, ::before or ::marker, returns the generated
// content element of which |aElement| is the parent. If |aPseudoType| is any
// other pseudo type (other than PseudoStyleType::NotPseudo) returns nullptr.
// Otherwise, returns |aElement|.
static dom::Element* GetElementForRestyle(dom::Element* aElement,
PseudoStyleType aPseudoType);
// Returns the pair of |Element, PseudoStyleType| from an element which could
// be an element or a pseudo element (i.e. an element used for restyling and
// DOM tree).
// Animation module usually uses a pair of (Element*, PseudoStyleType) to
// represent the animation target, and the |Element| in the pair is the
// generated content container if it's a pseudo element.
static std::pair<const dom::Element*, PseudoStyleType> GetElementPseudoPair(
const dom::Element* aElementOrPseudo);
} // namespace mozilla