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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_Keyframe_h
#define mozilla_dom_Keyframe_h
#include "nsCSSValue.h"
#include "nsTArray.h"
#include "mozilla/dom/BaseKeyframeTypesBinding.h" // CompositeOperationOrAuto
#include "mozilla/AnimatedPropertyID.h"
#include "mozilla/ServoStyleConsts.h"
#include "mozilla/Maybe.h"
#include "mozilla/RefPtr.h"
namespace mozilla {
struct StyleLockedDeclarationBlock;
* A property-value pair specified on a keyframe.
struct PropertyValuePair {
explicit PropertyValuePair(const AnimatedPropertyID& aProperty)
: mProperty(aProperty) {}
PropertyValuePair(const AnimatedPropertyID& aProperty,
RefPtr<StyleLockedDeclarationBlock>&& aValue)
: mProperty(aProperty), mServoDeclarationBlock(std::move(aValue)) {
MOZ_ASSERT(mServoDeclarationBlock, "Should be valid property value");
AnimatedPropertyID mProperty;
// The specified value when using the Servo backend.
RefPtr<StyleLockedDeclarationBlock> mServoDeclarationBlock;
#ifdef DEBUG
// Flag to indicate that when we call StyleAnimationValue::ComputeValues on
// this value we should behave as if that function had failed.
bool mSimulateComputeValuesFailure = false;
bool operator==(const PropertyValuePair&) const;
* A single keyframe.
* This is the canonical form in which keyframe effects are stored and
* corresponds closely to the type of objects returned via the getKeyframes()
* API.
* Before computing an output animation value, however, we flatten these frames
* down to a series of per-property value arrays where we also resolve any
* overlapping shorthands/longhands, convert specified CSS values to computed
* values, etc.
* When the target element or computed style changes, however, we rebuild these
* per-property arrays from the original list of keyframes objects. As a result,
* these objects represent the master definition of the effect's values.
struct Keyframe {
Keyframe() = default;
Keyframe(const Keyframe& aOther) = default;
Keyframe(Keyframe&& aOther) = default;
Keyframe& operator=(const Keyframe& aOther) = default;
Keyframe& operator=(Keyframe&& aOther) = default;
Maybe<double> mOffset;
static constexpr double kComputedOffsetNotSet = -1.0;
double mComputedOffset = kComputedOffsetNotSet;
Maybe<StyleComputedTimingFunction> mTimingFunction; // Nothing() here means
// "linear"
dom::CompositeOperationOrAuto mComposite =
CopyableTArray<PropertyValuePair> mPropertyValues;
} // namespace mozilla
#endif // mozilla_dom_Keyframe_h