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KeyframeUtils.cpp
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/* 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/. */
#include "mozilla/KeyframeUtils.h"
#include "mozilla/AnimationUtils.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/Move.h"
#include "mozilla/RangedArray.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/StyleAnimationValue.h"
#include "mozilla/TimingParams.h"
#include "mozilla/dom/BaseKeyframeTypesBinding.h" // For FastBaseKeyframe etc.
#include "mozilla/dom/Element.h"
#include "mozilla/dom/KeyframeEffectBinding.h"
#include "mozilla/dom/KeyframeEffectReadOnly.h" // For PropertyValuesPair etc.
#include "jsapi.h" // For ForOfIterator etc.
#include "nsClassHashtable.h"
#include "nsCSSParser.h"
#include "nsCSSPropertyIDSet.h"
#include "nsCSSProps.h"
#include "nsCSSPseudoElements.h" // For CSSPseudoElementType
#include "nsTArray.h"
#include <algorithm> // For std::stable_sort
namespace mozilla {
// ------------------------------------------------------------------
//
// Internal data types
//
// ------------------------------------------------------------------
// This is used while calculating paced spacing. If the keyframe is not pacable,
// we set its cumulative distance to kNotPaceable, so we can use this to check.
const double kNotPaceable = -1.0;
// For the aAllowList parameter of AppendStringOrStringSequence and
// GetPropertyValuesPairs.
enum class ListAllowance { eDisallow, eAllow };
/**
* A comparator to sort nsCSSPropertyID values such that longhands are sorted
* before shorthands, and shorthands with fewer components are sorted before
* shorthands with more components.
*
* Using this allows us to prioritize values specified by longhands (or smaller
* shorthand subsets) when longhands and shorthands are both specified
* on the one keyframe.
*
* Example orderings that result from this:
*
* margin-left, margin
*
* and:
*
* border-top-color, border-color, border-top, border
*/
class PropertyPriorityComparator
{
public:
PropertyPriorityComparator()
: mSubpropertyCountInitialized(false) {}
bool Equals(nsCSSPropertyID aLhs, nsCSSPropertyID aRhs) const
{
return aLhs == aRhs;
}
bool LessThan(nsCSSPropertyID aLhs,
nsCSSPropertyID aRhs) const
{
bool isShorthandLhs = nsCSSProps::IsShorthand(aLhs);
bool isShorthandRhs = nsCSSProps::IsShorthand(aRhs);
if (isShorthandLhs) {
if (isShorthandRhs) {
// First, sort shorthands by the number of longhands they have.
uint32_t subpropCountLhs = SubpropertyCount(aLhs);
uint32_t subpropCountRhs = SubpropertyCount(aRhs);
if (subpropCountLhs != subpropCountRhs) {
return subpropCountLhs < subpropCountRhs;
}
// Otherwise, sort by IDL name below.
} else {
// Put longhands before shorthands.
return false;
}
} else {
if (isShorthandRhs) {
// Put longhands before shorthands.
return true;
}
}
// For two longhand properties, or two shorthand with the same number
// of longhand components, sort by IDL name.
return nsCSSProps::PropertyIDLNameSortPosition(aLhs) <
nsCSSProps::PropertyIDLNameSortPosition(aRhs);
}
uint32_t SubpropertyCount(nsCSSPropertyID aProperty) const
{
if (!mSubpropertyCountInitialized) {
PodZero(&mSubpropertyCount);
mSubpropertyCountInitialized = true;
}
if (mSubpropertyCount[aProperty] == 0) {
uint32_t count = 0;
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(
p, aProperty, CSSEnabledState::eForAllContent) {
++count;
}
mSubpropertyCount[aProperty] = count;
}
return mSubpropertyCount[aProperty];
}
private:
// Cache of shorthand subproperty counts.
mutable RangedArray<
uint32_t,
eCSSProperty_COUNT_no_shorthands,
eCSSProperty_COUNT - eCSSProperty_COUNT_no_shorthands> mSubpropertyCount;
mutable bool mSubpropertyCountInitialized;
};
/**
* Adaptor for PropertyPriorityComparator to sort objects which have
* a mProperty member.
*/
template <typename T>
class TPropertyPriorityComparator : PropertyPriorityComparator
{
public:
bool Equals(const T& aLhs, const T& aRhs) const
{
return PropertyPriorityComparator::Equals(aLhs.mProperty, aRhs.mProperty);
}
bool LessThan(const T& aLhs, const T& aRhs) const
{
return PropertyPriorityComparator::LessThan(aLhs.mProperty, aRhs.mProperty);
}
};
/**
* Iterator to walk through a PropertyValuePair array using the ordering
* provided by PropertyPriorityComparator.
*/
class PropertyPriorityIterator
{
public:
explicit PropertyPriorityIterator(
const nsTArray<PropertyValuePair>& aProperties)
: mProperties(aProperties)
{
mSortedPropertyIndices.SetCapacity(mProperties.Length());
for (size_t i = 0, len = mProperties.Length(); i < len; ++i) {
PropertyAndIndex propertyIndex = { mProperties[i].mProperty, i };
mSortedPropertyIndices.AppendElement(propertyIndex);
}
mSortedPropertyIndices.Sort(PropertyAndIndex::Comparator());
}
class Iter
{
public:
explicit Iter(const PropertyPriorityIterator& aParent)
: mParent(aParent)
, mIndex(0) { }
static Iter EndIter(const PropertyPriorityIterator &aParent)
{
Iter iter(aParent);
iter.mIndex = aParent.mSortedPropertyIndices.Length();
return iter;
}
bool operator!=(const Iter& aOther) const
{
return mIndex != aOther.mIndex;
}
Iter& operator++()
{
MOZ_ASSERT(mIndex + 1 <= mParent.mSortedPropertyIndices.Length(),
"Should not seek past end iterator");
mIndex++;
return *this;
}
const PropertyValuePair& operator*()
{
MOZ_ASSERT(mIndex < mParent.mSortedPropertyIndices.Length(),
"Should not try to dereference an end iterator");
return mParent.mProperties[mParent.mSortedPropertyIndices[mIndex].mIndex];
}
private:
const PropertyPriorityIterator& mParent;
size_t mIndex;
};
Iter begin() { return Iter(*this); }
Iter end() { return Iter::EndIter(*this); }
private:
struct PropertyAndIndex
{
nsCSSPropertyID mProperty;
size_t mIndex; // Index of mProperty within mProperties
typedef TPropertyPriorityComparator<PropertyAndIndex> Comparator;
};
const nsTArray<PropertyValuePair>& mProperties;
nsTArray<PropertyAndIndex> mSortedPropertyIndices;
};
/**
* A property-values pair obtained from the open-ended properties
* discovered on a regular keyframe or property-indexed keyframe object.
*
* Single values (as required by a regular keyframe, and as also supported
* on property-indexed keyframes) are stored as the only element in
* mValues.
*/
struct PropertyValuesPair
{
nsCSSPropertyID mProperty;
nsTArray<nsString> mValues;
typedef TPropertyPriorityComparator<PropertyValuesPair> Comparator;
};
/**
* An additional property (for a property-values pair) found on a
* BaseKeyframe or BasePropertyIndexedKeyframe object.
*/
struct AdditionalProperty
{
nsCSSPropertyID mProperty;
size_t mJsidIndex; // Index into |ids| in GetPropertyValuesPairs.
struct PropertyComparator
{
bool Equals(const AdditionalProperty& aLhs,
const AdditionalProperty& aRhs) const
{
return aLhs.mProperty == aRhs.mProperty;
}
bool LessThan(const AdditionalProperty& aLhs,
const AdditionalProperty& aRhs) const
{
return nsCSSProps::PropertyIDLNameSortPosition(aLhs.mProperty) <
nsCSSProps::PropertyIDLNameSortPosition(aRhs.mProperty);
}
};
};
/**
* Data for a segment in a keyframe animation of a given property
* whose value is a StyleAnimationValue.
*
* KeyframeValueEntry is used in GetAnimationPropertiesFromKeyframes
* to gather data for each individual segment.
*/
struct KeyframeValueEntry
{
nsCSSPropertyID mProperty;
StyleAnimationValue mValue;
float mOffset;
Maybe<ComputedTimingFunction> mTimingFunction;
struct PropertyOffsetComparator
{
static bool Equals(const KeyframeValueEntry& aLhs,
const KeyframeValueEntry& aRhs)
{
return aLhs.mProperty == aRhs.mProperty &&
aLhs.mOffset == aRhs.mOffset;
}
static bool LessThan(const KeyframeValueEntry& aLhs,
const KeyframeValueEntry& aRhs)
{
// First, sort by property IDL name.
int32_t order = nsCSSProps::PropertyIDLNameSortPosition(aLhs.mProperty) -
nsCSSProps::PropertyIDLNameSortPosition(aRhs.mProperty);
if (order != 0) {
return order < 0;
}
// Then, by offset.
return aLhs.mOffset < aRhs.mOffset;
}
};
};
class ComputedOffsetComparator
{
public:
static bool Equals(const Keyframe& aLhs, const Keyframe& aRhs)
{
return aLhs.mComputedOffset == aRhs.mComputedOffset;
}
static bool LessThan(const Keyframe& aLhs, const Keyframe& aRhs)
{
return aLhs.mComputedOffset < aRhs.mComputedOffset;
}
};
// ------------------------------------------------------------------
//
// Inlined helper methods
//
// ------------------------------------------------------------------
inline bool
IsInvalidValuePair(const PropertyValuePair& aPair, StyleBackendType aBackend)
{
if (aBackend == StyleBackendType::Servo) {
return !aPair.mServoDeclarationBlock;
}
// There are three types of values we store as token streams:
//
// * Shorthand values (where we manually extract the token stream's string
// value) and pass that along to various parsing methods
// * Longhand values with variable references
// * Invalid values
//
// We can distinguish between the last two cases because for invalid values
// we leave the token stream's mPropertyID as eCSSProperty_UNKNOWN.
return !nsCSSProps::IsShorthand(aPair.mProperty) &&
aPair.mValue.GetUnit() == eCSSUnit_TokenStream &&
aPair.mValue.GetTokenStreamValue()->mPropertyID
== eCSSProperty_UNKNOWN;
}
// ------------------------------------------------------------------
//
// Internal helper method declarations
//
// ------------------------------------------------------------------
static void
GetKeyframeListFromKeyframeSequence(JSContext* aCx,
nsIDocument* aDocument,
JS::ForOfIterator& aIterator,
nsTArray<Keyframe>& aResult,
ErrorResult& aRv);
static bool
ConvertKeyframeSequence(JSContext* aCx,
nsIDocument* aDocument,
JS::ForOfIterator& aIterator,
nsTArray<Keyframe>& aResult);
static bool
GetPropertyValuesPairs(JSContext* aCx,
JS::Handle<JSObject*> aObject,
ListAllowance aAllowLists,
nsTArray<PropertyValuesPair>& aResult);
static bool
AppendStringOrStringSequenceToArray(JSContext* aCx,
JS::Handle<JS::Value> aValue,
ListAllowance aAllowLists,
nsTArray<nsString>& aValues);
static bool
AppendValueAsString(JSContext* aCx,
nsTArray<nsString>& aValues,
JS::Handle<JS::Value> aValue);
static PropertyValuePair
MakePropertyValuePair(nsCSSPropertyID aProperty, const nsAString& aStringValue,
nsCSSParser& aParser, nsIDocument* aDocument);
static bool
HasValidOffsets(const nsTArray<Keyframe>& aKeyframes);
static void
MarkAsComputeValuesFailureKey(PropertyValuePair& aPair);
static bool
IsComputeValuesFailureKey(const PropertyValuePair& aPair);
static void
BuildSegmentsFromValueEntries(nsTArray<KeyframeValueEntry>& aEntries,
nsTArray<AnimationProperty>& aResult);
static void
GetKeyframeListFromPropertyIndexedKeyframe(JSContext* aCx,
nsIDocument* aDocument,
JS::Handle<JS::Value> aValue,
nsTArray<Keyframe>& aResult,
ErrorResult& aRv);
static bool
RequiresAdditiveAnimation(const nsTArray<Keyframe>& aKeyframes,
nsIDocument* aDocument);
static void
DistributeRange(const Range<Keyframe>& aSpacingRange,
const Range<Keyframe>& aRangeToAdjust);
static void
DistributeRange(const Range<Keyframe>& aSpacingRange);
static void
PaceRange(const Range<Keyframe>& aKeyframes,
const Range<double>& aCumulativeDistances);
static nsTArray<double>
GetCumulativeDistances(const nsTArray<ComputedKeyframeValues>& aValues,
nsCSSPropertyID aProperty,
nsStyleContext* aStyleContext);
// ------------------------------------------------------------------
//
// Public API
//
// ------------------------------------------------------------------
/* static */ nsTArray<Keyframe>
KeyframeUtils::GetKeyframesFromObject(JSContext* aCx,
nsIDocument* aDocument,
JS::Handle<JSObject*> aFrames,
ErrorResult& aRv)
{
MOZ_ASSERT(!aRv.Failed());
nsTArray<Keyframe> keyframes;
if (!aFrames) {
// The argument was explicitly null meaning no keyframes.
return keyframes;
}
// At this point we know we have an object. We try to convert it to a
// sequence of keyframes first, and if that fails due to not being iterable,
// we try to convert it to a property-indexed keyframe.
JS::Rooted<JS::Value> objectValue(aCx, JS::ObjectValue(*aFrames));
JS::ForOfIterator iter(aCx);
if (!iter.init(objectValue, JS::ForOfIterator::AllowNonIterable)) {
aRv.Throw(NS_ERROR_FAILURE);
return keyframes;
}
if (iter.valueIsIterable()) {
GetKeyframeListFromKeyframeSequence(aCx, aDocument, iter, keyframes, aRv);
} else {
GetKeyframeListFromPropertyIndexedKeyframe(aCx, aDocument, objectValue,
keyframes, aRv);
}
if (aRv.Failed()) {
MOZ_ASSERT(keyframes.IsEmpty(),
"Should not set any keyframes when there is an error");
return keyframes;
}
// We currently don't support additive animation. However, Web Animations
// says that if you don't have a keyframe at offset 0 or 1, then you should
// synthesize one using an additive zero value when you go to compose style.
// Until we implement additive animations we just throw if we encounter any
// set of keyframes that would put us in that situation.
if (RequiresAdditiveAnimation(keyframes, aDocument)) {
aRv.Throw(NS_ERROR_DOM_ANIM_MISSING_PROPS_ERR);
keyframes.Clear();
}
return keyframes;
}
/* static */ void
KeyframeUtils::ApplySpacing(nsTArray<Keyframe>& aKeyframes,
SpacingMode aSpacingMode,
nsCSSPropertyID aProperty,
nsTArray<ComputedKeyframeValues>& aComputedValues,
nsStyleContext* aStyleContext)
{
if (aKeyframes.IsEmpty()) {
return;
}
nsTArray<double> cumulativeDistances;
if (aSpacingMode == SpacingMode::paced) {
MOZ_ASSERT(IsAnimatableProperty(aProperty),
"Paced property should be animatable");
cumulativeDistances = GetCumulativeDistances(aComputedValues, aProperty,
aStyleContext);
// Reset the computed offsets if using paced spacing.
for (Keyframe& keyframe : aKeyframes) {
keyframe.mComputedOffset = Keyframe::kComputedOffsetNotSet;
}
}
// If the first keyframe has an unspecified offset, fill it in with 0%.
// If there is only a single keyframe, then it gets 100%.
if (aKeyframes.Length() > 1) {
Keyframe& firstElement = aKeyframes[0];
firstElement.mComputedOffset = firstElement.mOffset.valueOr(0.0);
// We will fill in the last keyframe's offset below
} else {
Keyframe& lastElement = aKeyframes.LastElement();
lastElement.mComputedOffset = lastElement.mOffset.valueOr(1.0);
}
// Fill in remaining missing offsets.
const Keyframe* const last = aKeyframes.cend() - 1;
const RangedPtr<Keyframe> begin(aKeyframes.begin(), aKeyframes.Length());
RangedPtr<Keyframe> keyframeA = begin;
while (keyframeA != last) {
// Find keyframe A and keyframe B *between* which we will apply spacing.
RangedPtr<Keyframe> keyframeB = keyframeA + 1;
while (keyframeB->mOffset.isNothing() && keyframeB != last) {
++keyframeB;
}
keyframeB->mComputedOffset = keyframeB->mOffset.valueOr(1.0);
// Fill computed offsets in (keyframe A, keyframe B).
if (aSpacingMode == SpacingMode::distribute) {
DistributeRange(Range<Keyframe>(keyframeA, keyframeB + 1));
} else {
// a) Find Paced A (first paceable keyframe) and
// Paced B (last paceable keyframe) in [keyframe A, keyframe B].
RangedPtr<Keyframe> pacedA = keyframeA;
while (pacedA < keyframeB &&
cumulativeDistances[pacedA - begin] == kNotPaceable) {
++pacedA;
}
RangedPtr<Keyframe> pacedB = keyframeB;
while (pacedB > keyframeA &&
cumulativeDistances[pacedB - begin] == kNotPaceable) {
--pacedB;
}
// As spec says, if there is no paceable keyframe
// in [keyframe A, keyframe B], we let Paced A and Paced B refer to
// keyframe B.
if (pacedA > pacedB) {
pacedA = pacedB = keyframeB;
}
// b) Apply distributing offsets in (keyframe A, Paced A] and
// [Paced B, keyframe B).
DistributeRange(Range<Keyframe>(keyframeA, keyframeB + 1),
Range<Keyframe>(keyframeA + 1, pacedA + 1));
DistributeRange(Range<Keyframe>(keyframeA, keyframeB + 1),
Range<Keyframe>(pacedB, keyframeB));
// c) Apply paced offsets to each paceable keyframe in (Paced A, Paced B).
// We pass the range [Paced A, Paced B] since PaceRange needs the end
// points of the range in order to calculate the correct offset.
PaceRange(Range<Keyframe>(pacedA, pacedB + 1),
Range<double>(&cumulativeDistances[pacedA - begin],
pacedB - pacedA + 1));
// d) Fill in any computed offsets in (Paced A, Paced B) that are still
// not set (e.g. because the keyframe was not paceable, or because the
// cumulative distance between paceable properties was zero).
for (RangedPtr<Keyframe> frame = pacedA + 1; frame < pacedB; ++frame) {
if (frame->mComputedOffset != Keyframe::kComputedOffsetNotSet) {
continue;
}
RangedPtr<Keyframe> start = frame - 1;
RangedPtr<Keyframe> end = frame + 1;
while (end < pacedB &&
end->mComputedOffset == Keyframe::kComputedOffsetNotSet) {
++end;
}
DistributeRange(Range<Keyframe>(start, end + 1));
frame = end;
}
}
keyframeA = keyframeB;
}
}
/* static */ void
KeyframeUtils::ApplyDistributeSpacing(nsTArray<Keyframe>& aKeyframes)
{
nsTArray<ComputedKeyframeValues> emptyArray;
ApplySpacing(aKeyframes, SpacingMode::distribute, eCSSProperty_UNKNOWN,
emptyArray, nullptr);
}
/* static */ nsTArray<ComputedKeyframeValues>
KeyframeUtils::GetComputedKeyframeValues(const nsTArray<Keyframe>& aKeyframes,
dom::Element* aElement,
nsStyleContext* aStyleContext)
{
MOZ_ASSERT(aStyleContext);
MOZ_ASSERT(aElement);
StyleBackendType styleBackend = aElement->OwnerDoc()->GetStyleBackendType();
const size_t len = aKeyframes.Length();
nsTArray<ComputedKeyframeValues> result(len);
for (const Keyframe& frame : aKeyframes) {
nsCSSPropertyIDSet propertiesOnThisKeyframe;
ComputedKeyframeValues* computedValues = result.AppendElement();
for (const PropertyValuePair& pair :
PropertyPriorityIterator(frame.mPropertyValues)) {
MOZ_ASSERT(!pair.mServoDeclarationBlock ||
styleBackend == StyleBackendType::Servo,
"Animation values were parsed using Servo backend but target"
" element is not using Servo backend?");
if (IsInvalidValuePair(pair, styleBackend)) {
continue;
}
// Expand each value into the set of longhands and produce
// a KeyframeValueEntry for each value.
nsTArray<PropertyStyleAnimationValuePair> values;
if (styleBackend == StyleBackendType::Servo) {
if (!StyleAnimationValue::ComputeValues(pair.mProperty,
CSSEnabledState::eForAllContent, aStyleContext,
*pair.mServoDeclarationBlock, values)) {
continue;
}
} else {
// For shorthands, we store the string as a token stream so we need to
// extract that first.
if (nsCSSProps::IsShorthand(pair.mProperty)) {
nsCSSValueTokenStream* tokenStream = pair.mValue.GetTokenStreamValue();
if (!StyleAnimationValue::ComputeValues(pair.mProperty,
CSSEnabledState::eForAllContent, aElement, aStyleContext,
tokenStream->mTokenStream, /* aUseSVGMode */ false, values) ||
IsComputeValuesFailureKey(pair)) {
continue;
}
} else {
if (!StyleAnimationValue::ComputeValues(pair.mProperty,
CSSEnabledState::eForAllContent, aElement, aStyleContext,
pair.mValue, /* aUseSVGMode */ false, values)) {
continue;
}
MOZ_ASSERT(values.Length() == 1,
"Longhand properties should produce a single"
" StyleAnimationValue");
}
}
for (auto& value : values) {
// If we already got a value for this property on the keyframe,
// skip this one.
if (propertiesOnThisKeyframe.HasProperty(value.mProperty)) {
continue;
}
computedValues->AppendElement(value);
propertiesOnThisKeyframe.AddProperty(value.mProperty);
}
}
}
MOZ_ASSERT(result.Length() == aKeyframes.Length(), "Array length mismatch");
return result;
}
/* static */ nsTArray<AnimationProperty>
KeyframeUtils::GetAnimationPropertiesFromKeyframes(
const nsTArray<Keyframe>& aKeyframes,
const nsTArray<ComputedKeyframeValues>& aComputedValues,
nsStyleContext* aStyleContext)
{
MOZ_ASSERT(aKeyframes.Length() == aComputedValues.Length(),
"Array length mismatch");
nsTArray<KeyframeValueEntry> entries(aKeyframes.Length());
const size_t len = aKeyframes.Length();
for (size_t i = 0; i < len; ++i) {
const Keyframe& frame = aKeyframes[i];
for (auto& value : aComputedValues[i]) {
MOZ_ASSERT(frame.mComputedOffset != Keyframe::kComputedOffsetNotSet,
"Invalid computed offset");
KeyframeValueEntry* entry = entries.AppendElement();
entry->mOffset = frame.mComputedOffset;
entry->mProperty = value.mProperty;
entry->mValue = value.mValue;
entry->mTimingFunction = frame.mTimingFunction;
}
}
nsTArray<AnimationProperty> result;
BuildSegmentsFromValueEntries(entries, result);
return result;
}
/* static */ bool
KeyframeUtils::IsAnimatableProperty(nsCSSPropertyID aProperty)
{
if (aProperty == eCSSProperty_UNKNOWN) {
return false;
}
if (!nsCSSProps::IsShorthand(aProperty)) {
return nsCSSProps::kAnimTypeTable[aProperty] != eStyleAnimType_None;
}
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(subprop, aProperty,
CSSEnabledState::eForAllContent) {
if (nsCSSProps::kAnimTypeTable[*subprop] != eStyleAnimType_None) {
return true;
}
}
return false;
}
// ------------------------------------------------------------------
//
// Internal helpers
//
// ------------------------------------------------------------------
/**
* Converts a JS object to an IDL sequence<Keyframe>.
*
* @param aCx The JSContext corresponding to |aIterator|.
* @param aDocument The document to use when parsing CSS properties.
* @param aIterator An already-initialized ForOfIterator for the JS
* object to iterate over as a sequence.
* @param aResult The array into which the resulting Keyframe objects will be
* appended.
* @param aRv Out param to store any errors thrown by this function.
*/
static void
GetKeyframeListFromKeyframeSequence(JSContext* aCx,
nsIDocument* aDocument,
JS::ForOfIterator& aIterator,
nsTArray<Keyframe>& aResult,
ErrorResult& aRv)
{
MOZ_ASSERT(!aRv.Failed());
MOZ_ASSERT(aResult.IsEmpty());
// Convert the object in aIterator to a sequence of keyframes producing
// an array of Keyframe objects.
if (!ConvertKeyframeSequence(aCx, aDocument, aIterator, aResult)) {
aRv.Throw(NS_ERROR_FAILURE);
aResult.Clear();
return;
}
// If the sequence<> had zero elements, we won't generate any
// keyframes.
if (aResult.IsEmpty()) {
return;
}
// Check that the keyframes are loosely sorted and with values all
// between 0% and 100%.
if (!HasValidOffsets(aResult)) {
aRv.ThrowTypeError<dom::MSG_INVALID_KEYFRAME_OFFSETS>();
aResult.Clear();
return;
}
}
/**
* Converts a JS object wrapped by the given JS::ForIfIterator to an
* IDL sequence<Keyframe> and stores the resulting Keyframe objects in
* aResult.
*/
static bool
ConvertKeyframeSequence(JSContext* aCx,
nsIDocument* aDocument,
JS::ForOfIterator& aIterator,
nsTArray<Keyframe>& aResult)
{
JS::Rooted<JS::Value> value(aCx);
nsCSSParser parser(aDocument->CSSLoader());
for (;;) {
bool done;
if (!aIterator.next(&value, &done)) {
return false;
}
if (done) {
break;
}
// Each value found when iterating the object must be an object
// or null/undefined (which gets treated as a default {} dictionary
// value).
if (!value.isObject() && !value.isNullOrUndefined()) {
dom::ThrowErrorMessage(aCx, dom::MSG_NOT_OBJECT,
"Element of sequence<Keyframe> argument");
return false;
}
// Convert the JS value into a BaseKeyframe dictionary value.
dom::binding_detail::FastBaseKeyframe keyframeDict;
if (!keyframeDict.Init(aCx, value,
"Element of sequence<Keyframe> argument")) {
return false;
}
Keyframe* keyframe = aResult.AppendElement(fallible);
if (!keyframe) {
return false;
}
if (!keyframeDict.mOffset.IsNull()) {
keyframe->mOffset.emplace(keyframeDict.mOffset.Value());
}
ErrorResult rv;
keyframe->mTimingFunction =
TimingParams::ParseEasing(keyframeDict.mEasing, aDocument, rv);
if (rv.MaybeSetPendingException(aCx)) {
return false;
}
// Look for additional property-values pairs on the object.
nsTArray<PropertyValuesPair> propertyValuePairs;
if (value.isObject()) {
JS::Rooted<JSObject*> object(aCx, &value.toObject());
if (!GetPropertyValuesPairs(aCx, object,
ListAllowance::eDisallow,
propertyValuePairs)) {
return false;
}
}
for (PropertyValuesPair& pair : propertyValuePairs) {
MOZ_ASSERT(pair.mValues.Length() == 1);
keyframe->mPropertyValues.AppendElement(
MakePropertyValuePair(pair.mProperty, pair.mValues[0], parser,
aDocument));
// When we go to convert keyframes into arrays of property values we
// call StyleAnimation::ComputeValues. This should normally return true
// but in order to test the case where it does not, BaseKeyframeDict
// includes a chrome-only member that can be set to indicate that
// ComputeValues should fail for shorthand property values on that
// keyframe.
if (nsCSSProps::IsShorthand(pair.mProperty) &&
keyframeDict.mSimulateComputeValuesFailure) {
MarkAsComputeValuesFailureKey(keyframe->mPropertyValues.LastElement());
}
}
}
return true;
}
/**
* Reads the property-values pairs from the specified JS object.
*
* @param aObject The JS object to look at.
* @param aAllowLists If eAllow, values will be converted to
* (DOMString or sequence<DOMString); if eDisallow, values
* will be converted to DOMString.
* @param aResult The array into which the enumerated property-values
* pairs will be stored.
* @return false on failure or JS exception thrown while interacting
* with aObject; true otherwise.
*/
static bool
GetPropertyValuesPairs(JSContext* aCx,
JS::Handle<JSObject*> aObject,
ListAllowance aAllowLists,
nsTArray<PropertyValuesPair>& aResult)
{
nsTArray<AdditionalProperty> properties;
// Iterate over all the properties on aObject and append an
// entry to properties for them.
//
// We don't compare the jsids that we encounter with those for
// the explicit dictionary members, since we know that none
// of the CSS property IDL names clash with them.
JS::Rooted<JS::IdVector> ids(aCx, JS::IdVector(aCx));
if (!JS_Enumerate(aCx, aObject, &ids)) {
return false;
}
for (size_t i = 0, n = ids.length(); i < n; i++) {
nsAutoJSString propName;
if (!propName.init(aCx, ids[i])) {
return false;
}
nsCSSPropertyID property =
nsCSSProps::LookupPropertyByIDLName(propName,
CSSEnabledState::eForAllContent);
if (KeyframeUtils::IsAnimatableProperty(property)) {
AdditionalProperty* p = properties.AppendElement();
p->mProperty = property;
p->mJsidIndex = i;
}
}
// Sort the entries by IDL name and then get each value and
// convert it either to a DOMString or to a
// (DOMString or sequence<DOMString>), depending on aAllowLists,
// and build up aResult.
properties.Sort(AdditionalProperty::PropertyComparator());
for (AdditionalProperty& p : properties) {
JS::Rooted<JS::Value> value(aCx);
if (!JS_GetPropertyById(aCx, aObject, ids[p.mJsidIndex], &value)) {
return false;
}
PropertyValuesPair* pair = aResult.AppendElement();
pair->mProperty = p.mProperty;
if (!AppendStringOrStringSequenceToArray(aCx, value, aAllowLists,
pair->mValues)) {
return false;
}
}
return true;
}
/**
* Converts aValue to DOMString, if aAllowLists is eDisallow, or
* to (DOMString or sequence<DOMString>) if aAllowLists is aAllow.
* The resulting strings are appended to aValues.
*/
static bool
AppendStringOrStringSequenceToArray(JSContext* aCx,
JS::Handle<JS::Value> aValue,
ListAllowance aAllowLists,
nsTArray<nsString>& aValues)
{
if (aAllowLists == ListAllowance::eAllow && aValue.isObject()) {
// The value is an object, and we want to allow lists; convert
// aValue to (DOMString or sequence<DOMString>).
JS::ForOfIterator iter(aCx);
if (!iter.init(aValue, JS::ForOfIterator::AllowNonIterable)) {
return false;
}
if (iter.valueIsIterable()) {
// If the object is iterable, convert it to sequence<DOMString>.
JS::Rooted<JS::Value> element(aCx);
for (;;) {
bool done;
if (!iter.next(&element, &done)) {
return false;
}
if (done) {
break;
}
if (!AppendValueAsString(aCx, aValues, element)) {
return false;
}
}
return true;
}
}
// Either the object is not iterable, or aAllowLists doesn't want
// a list; convert it to DOMString.
if (!AppendValueAsString(aCx, aValues, aValue)) {
return false;
}
return true;
}
/**
* Converts aValue to DOMString and appends it to aValues.
*/
static bool
AppendValueAsString(JSContext* aCx,
nsTArray<nsString>& aValues,
JS::Handle<JS::Value> aValue)
{
return ConvertJSValueToString(aCx, aValue, dom::eStringify, dom::eStringify,
*aValues.AppendElement());
}
/**
* Construct a PropertyValuePair parsing the given string into a suitable
* nsCSSValue object.
*
* @param aProperty The CSS property.
* @param aStringValue The property value to parse.
* @param aParser The CSS parser object to use.
* @param aDocument The document to use when parsing.
* @return The constructed PropertyValuePair object.
*/
static PropertyValuePair
MakePropertyValuePair(nsCSSPropertyID aProperty, const nsAString& aStringValue,
nsCSSParser& aParser, nsIDocument* aDocument)
{
MOZ_ASSERT(aDocument);
PropertyValuePair result;
result.mProperty = aProperty;
if (aDocument->GetStyleBackendType() == StyleBackendType::Servo) {
nsCString name = nsCSSProps::GetStringValue(aProperty);