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KeyframeEffect.cpp
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KeyframeEffect.cpp
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/*
* Copyright (C) 2017-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "KeyframeEffect.h"
#include "Animation.h"
#include "CSSAnimation.h"
#include "CSSCustomPropertyValue.h"
#include "CSSKeyframeRule.h"
#include "CSSPrimitiveValue.h"
#include "CSSPropertyAnimation.h"
#include "CSSPropertyNames.h"
#include "CSSPropertyParser.h"
#include "CSSSelector.h"
#include "CSSStyleDeclaration.h"
#include "CSSTimingFunctionValue.h"
#include "CSSTransition.h"
#include "CSSValue.h"
#include "CSSValueKeywords.h"
#include "ComputedStyleExtractor.h"
#include "Element.h"
#include "FontCascade.h"
#include "FrameView.h"
#include "GeometryUtilities.h"
#include "InspectorInstrumentation.h"
#include "JSCompositeOperation.h"
#include "JSCompositeOperationOrAuto.h"
#include "JSDOMConvert.h"
#include "JSKeyframeEffect.h"
#include "KeyframeEffectStack.h"
#include "Logging.h"
#include "MutableStyleProperties.h"
#include "PropertyAllowlist.h"
#include "RenderBox.h"
#include "RenderBoxModelObject.h"
#include "RenderElement.h"
#include "RenderStyle.h"
#include "Settings.h"
#include "StyleAdjuster.h"
#include "StylePendingResources.h"
#include "StyleProperties.h"
#include "StyleResolver.h"
#include "StyleScope.h"
#include "StyledElement.h"
#include "TimingFunction.h"
#include "TranslateTransformOperation.h"
#include "WillChangeData.h"
#include <JavaScriptCore/Exception.h>
#include <wtf/UUID.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
using namespace JSC;
KeyframeEffect::ParsedKeyframe::ParsedKeyframe()
: style(MutableStyleProperties::create())
{
}
KeyframeEffect::ParsedKeyframe::~ParsedKeyframe() = default;
static inline void invalidateElement(const std::optional<const Styleable>& styleable)
{
if (styleable)
styleable->element.invalidateStyleInternal();
}
String KeyframeEffect::CSSPropertyIDToIDLAttributeName(CSSPropertyID property)
{
// https://drafts.csswg.org/web-animations-1/#animation-property-name-to-idl-attribute-name
// 1. If property follows the <custom-property-name> production, return property.
// 2. If property refers to the CSS float property, return the string "cssFloat".
if (property == CSSPropertyFloat)
return "cssFloat"_s;
// 3. If property refers to the CSS offset property, return the string "cssOffset".
if (property == CSSPropertyOffset)
return "cssOffset"_s;
// 4. Otherwise, return the result of applying the CSS property to IDL attribute algorithm [CSSOM] to property.
return nameForIDL(property);
}
static inline CSSPropertyID IDLAttributeNameToAnimationPropertyName(const AtomString& idlAttributeName)
{
// https://drafts.csswg.org/web-animations-1/#idl-attribute-name-to-animation-property-name
// 1. If attribute conforms to the <custom-property-name> production, return attribute.
// 2. If attribute is the string "cssFloat", then return an animation property representing the CSS float property.
if (idlAttributeName == "cssFloat"_s)
return CSSPropertyFloat;
// 3. If attribute is the string "cssOffset", then return an animation property representing the CSS offset property.
if (idlAttributeName == "cssOffset"_s)
return CSSPropertyOffset;
// 4. Otherwise, return the result of applying the IDL attribute to CSS property algorithm [CSSOM] to attribute.
auto cssPropertyId = CSSStyleDeclaration::getCSSPropertyIDFromJavaScriptPropertyName(idlAttributeName);
if (cssPropertyId == CSSPropertyInvalid && isCustomPropertyName(idlAttributeName))
return CSSPropertyCustom;
// We need to check that converting the property back to IDL form yields the same result such that a property passed
// in non-IDL form is rejected, for instance "font-size".
if (idlAttributeName != KeyframeEffect::CSSPropertyIDToIDLAttributeName(cssPropertyId))
return CSSPropertyInvalid;
return cssPropertyId;
}
static inline void computeMissingKeyframeOffsets(Vector<KeyframeEffect::ParsedKeyframe>& keyframes)
{
// https://drafts.csswg.org/web-animations-1/#compute-missing-keyframe-offsets
if (keyframes.isEmpty())
return;
// 1. For each keyframe, in keyframes, let the computed keyframe offset of the keyframe be equal to its keyframe offset value.
// In our implementation, we only set non-null values to avoid making computedOffset std::optional<double>. Instead, we'll know
// that a keyframe hasn't had a computed offset by checking if it has a null offset and a 0 computedOffset, since the first
// keyframe will already have a 0 computedOffset.
for (auto& keyframe : keyframes) {
auto computedOffset = keyframe.offset;
keyframe.computedOffset = computedOffset ? *computedOffset : 0;
}
// 2. If keyframes contains more than one keyframe and the computed keyframe offset of the first keyframe in keyframes is null,
// set the computed keyframe offset of the first keyframe to 0.
if (keyframes.size() > 1 && !keyframes[0].offset)
keyframes[0].computedOffset = 0;
// 3. If the computed keyframe offset of the last keyframe in keyframes is null, set its computed keyframe offset to 1.
if (!keyframes.last().offset)
keyframes.last().computedOffset = 1;
// 4. For each pair of keyframes A and B where:
// - A appears before B in keyframes, and
// - A and B have a computed keyframe offset that is not null, and
// - all keyframes between A and B have a null computed keyframe offset,
// calculate the computed keyframe offset of each keyframe between A and B as follows:
// 1. Let offsetk be the computed keyframe offset of a keyframe k.
// 2. Let n be the number of keyframes between and including A and B minus 1.
// 3. Let index refer to the position of keyframe in the sequence of keyframes between A and B such that the first keyframe after A has an index of 1.
// 4. Set the computed keyframe offset of keyframe to offsetA + (offsetB − offsetA) × index / n.
size_t indexOfLastKeyframeWithNonNullOffset = 0;
for (size_t i = 1; i < keyframes.size(); ++i) {
auto& keyframe = keyframes[i];
// Keyframes with a null offset that don't yet have a non-zero computed offset are keyframes
// with an offset that needs to be computed.
if (!keyframe.offset && !keyframe.computedOffset)
continue;
if (indexOfLastKeyframeWithNonNullOffset != i - 1) {
double lastNonNullOffset = keyframes[indexOfLastKeyframeWithNonNullOffset].computedOffset;
double offsetDelta = keyframe.computedOffset - lastNonNullOffset;
double offsetIncrement = offsetDelta / (i - indexOfLastKeyframeWithNonNullOffset);
size_t indexOfFirstKeyframeWithNullOffset = indexOfLastKeyframeWithNonNullOffset + 1;
for (size_t j = indexOfFirstKeyframeWithNullOffset; j < i; ++j)
keyframes[j].computedOffset = lastNonNullOffset + (j - indexOfLastKeyframeWithNonNullOffset) * offsetIncrement;
}
indexOfLastKeyframeWithNonNullOffset = i;
}
}
static inline ExceptionOr<KeyframeEffect::KeyframeLikeObject> processKeyframeLikeObject(JSGlobalObject& lexicalGlobalObject, Document& document, Strong<JSObject>&& keyframesInput, bool allowLists)
{
// https://drafts.csswg.org/web-animations-1/#process-a-keyframe-like-object
VM& vm = lexicalGlobalObject.vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// 1. Run the procedure to convert an ECMAScript value to a dictionary type [WEBIDL] with keyframe input as the ECMAScript value as follows:
//
// If allow lists is true, use the following dictionary type:
//
// dictionary BasePropertyIndexedKeyframe {
// (double? or sequence<double?>) offset = [];
// (DOMString or sequence<DOMString>) easing = [];
// (CompositeOperationOrAuto or sequence<CompositeOperationOrAuto>) composite = [];
// };
//
// Otherwise, use the following dictionary type:
//
// dictionary BaseKeyframe {
// double? offset = null;
// DOMString easing = "linear";
// CompositeOperationOrAuto composite = "auto";
// };
//
// Store the result of this procedure as keyframe output.
KeyframeEffect::BasePropertyIndexedKeyframe baseProperties;
if (allowLists)
baseProperties = convert<IDLDictionary<KeyframeEffect::BasePropertyIndexedKeyframe>>(lexicalGlobalObject, keyframesInput.get());
else {
auto baseKeyframe = convert<IDLDictionary<KeyframeEffect::BaseKeyframe>>(lexicalGlobalObject, keyframesInput.get());
if (baseKeyframe.offset)
baseProperties.offset = baseKeyframe.offset.value();
else
baseProperties.offset = nullptr;
baseProperties.easing = baseKeyframe.easing;
if (document.settings().webAnimationsCompositeOperationsEnabled())
baseProperties.composite = baseKeyframe.composite;
}
RETURN_IF_EXCEPTION(scope, Exception { TypeError });
KeyframeEffect::KeyframeLikeObject keyframeOuput;
keyframeOuput.baseProperties = baseProperties;
// 2. Build up a list of animatable properties as follows:
//
// 1. Let animatable properties be a list of property names (including shorthand properties that have longhand sub-properties
// that are animatable) that can be animated by the implementation.
// 2. Convert each property name in animatable properties to the equivalent IDL attribute by applying the animation property
// name to IDL attribute name algorithm.
// 3. Let input properties be the result of calling the EnumerableOwnNames operation with keyframe input as the object.
PropertyNameArray inputProperties(vm, PropertyNameMode::Strings, PrivateSymbolMode::Exclude);
JSObject::getOwnPropertyNames(keyframesInput.get(), &lexicalGlobalObject, inputProperties, DontEnumPropertiesMode::Exclude);
// 4. Make up a new list animation properties that consists of all of the properties that are in both input properties and animatable
// properties, or which are in input properties and conform to the <custom-property-name> production.
Vector<JSC::Identifier> animationProperties;
for (auto& inputProperty : inputProperties) {
auto cssProperty = IDLAttributeNameToAnimationPropertyName(inputProperty.string());
if (!isExposed(cssProperty, &document.settings()))
cssProperty = CSSPropertyInvalid;
auto resolvedCSSProperty = CSSProperty::resolveDirectionAwareProperty(cssProperty, RenderStyle::initialDirection(), RenderStyle::initialWritingMode());
if (CSSPropertyAnimation::isPropertyAnimatable(resolvedCSSProperty))
animationProperties.append(inputProperty);
}
// 5. Sort animation properties in ascending order by the Unicode codepoints that define each property name.
std::sort(animationProperties.begin(), animationProperties.end(), [](auto& lhs, auto& rhs) {
return codePointCompareLessThan(lhs.string().string(), rhs.string().string());
});
// 6. For each property name in animation properties,
size_t numberOfAnimationProperties = animationProperties.size();
for (size_t i = 0; i < numberOfAnimationProperties; ++i) {
// 1. Let raw value be the result of calling the [[Get]] internal method on keyframe input, with property name as the property
// key and keyframe input as the receiver.
auto rawValue = keyframesInput->get(&lexicalGlobalObject, animationProperties[i]);
// 2. Check the completion record of raw value.
RETURN_IF_EXCEPTION(scope, Exception { TypeError });
// 3. Convert raw value to a DOMString or sequence of DOMStrings property values as follows:
Vector<String> propertyValues;
if (allowLists) {
// If allow lists is true,
// Let property values be the result of converting raw value to IDL type (DOMString or sequence<DOMString>)
// using the procedures defined for converting an ECMAScript value to an IDL value [WEBIDL].
// If property values is a single DOMString, replace property values with a sequence of DOMStrings with the original value of property
// Values as the only element.
if (rawValue.isObject())
propertyValues = convert<IDLSequence<IDLDOMString>>(lexicalGlobalObject, rawValue);
else
propertyValues = { rawValue.toWTFString(&lexicalGlobalObject) };
} else {
// Otherwise,
// Let property values be the result of converting raw value to a DOMString using the procedure for converting an ECMAScript value to a DOMString.
propertyValues = { convert<IDLDOMString>(lexicalGlobalObject, rawValue) };
}
RETURN_IF_EXCEPTION(scope, Exception { TypeError });
// 4. Calculate the normalized property name as the result of applying the IDL attribute name to animation property name algorithm to property name.
auto propertyName = animationProperties[i].string();
auto cssPropertyID = IDLAttributeNameToAnimationPropertyName(propertyName);
ASSERT(isExposed(cssPropertyID, &document.settings()));
// 5. Add a property to to keyframe output with normalized property name as the property name, and property values as the property value.
if (cssPropertyID == CSSPropertyCustom)
keyframeOuput.propertiesAndValues.append({ cssPropertyID, propertyName, propertyValues });
else
keyframeOuput.propertiesAndValues.append({ cssPropertyID, emptyAtom(), propertyValues });
}
// 7. Return keyframe output.
return { WTFMove(keyframeOuput) };
}
static inline ExceptionOr<void> processIterableKeyframes(JSGlobalObject& lexicalGlobalObject, Document& document, Strong<JSObject>&& keyframesInput, JSValue method, Vector<KeyframeEffect::ParsedKeyframe>& parsedKeyframes)
{
CSSParserContext parserContext(document);
// 1. Let iter be GetIterator(object, method).
forEachInIterable(lexicalGlobalObject, keyframesInput.get(), method, [&parsedKeyframes, &document, &parserContext](VM& vm, JSGlobalObject& lexicalGlobalObject, JSValue nextValue) -> ExceptionOr<void> {
// Steps 2 through 5 are already implemented by forEachInIterable().
auto scope = DECLARE_THROW_SCOPE(vm);
// 6. If Type(nextItem) is not Undefined, Null or Object, then throw a TypeError and abort these steps.
if (!nextValue.isUndefinedOrNull() && !nextValue.isObject()) {
throwException(&lexicalGlobalObject, scope, JSC::Exception::create(vm, createTypeError(&lexicalGlobalObject)));
return { };
}
if (!nextValue.isObject()) {
parsedKeyframes.append({ });
return { };
}
// 7. Append to processed keyframes the result of running the procedure to process a keyframe-like object passing nextItem
// as the keyframe input and with the allow lists flag set to false.
auto processKeyframeLikeObjectResult = processKeyframeLikeObject(lexicalGlobalObject, document, Strong<JSObject>(vm, nextValue.toObject(&lexicalGlobalObject)), false);
if (processKeyframeLikeObjectResult.hasException())
return processKeyframeLikeObjectResult.releaseException();
auto keyframeLikeObject = processKeyframeLikeObjectResult.returnValue();
KeyframeEffect::ParsedKeyframe keyframeOutput;
// When calling processKeyframeLikeObject() with the "allow lists" flag set to false, the only offset
// alternatives we should expect are double and nullptr.
if (std::holds_alternative<double>(keyframeLikeObject.baseProperties.offset))
keyframeOutput.offset = std::get<double>(keyframeLikeObject.baseProperties.offset);
else
ASSERT(std::holds_alternative<std::nullptr_t>(keyframeLikeObject.baseProperties.offset));
// When calling processKeyframeLikeObject() with the "allow lists" flag set to false, the only easing
// alternative we should expect is String.
ASSERT(std::holds_alternative<String>(keyframeLikeObject.baseProperties.easing));
keyframeOutput.easing = std::get<String>(keyframeLikeObject.baseProperties.easing);
// When calling processKeyframeLikeObject() with the "allow lists" flag set to false, the only composite
// alternatives we should expect is CompositeOperationAuto.
if (document.settings().webAnimationsCompositeOperationsEnabled()) {
ASSERT(std::holds_alternative<CompositeOperationOrAuto>(keyframeLikeObject.baseProperties.composite));
keyframeOutput.composite = std::get<CompositeOperationOrAuto>(keyframeLikeObject.baseProperties.composite);
}
for (auto& propertyAndValue : keyframeLikeObject.propertiesAndValues) {
auto cssPropertyId = propertyAndValue.property;
// When calling processKeyframeLikeObject() with the "allow lists" flag set to false,
// there should only ever be a single value for a given property.
ASSERT(propertyAndValue.values.size() == 1);
auto stringValue = propertyAndValue.values[0];
if (cssPropertyId == CSSPropertyCustom) {
auto customProperty = propertyAndValue.customProperty;
if (keyframeOutput.style->setCustomProperty(customProperty, stringValue, false, parserContext))
keyframeOutput.customStyleStrings.set(customProperty, stringValue);
} else if (keyframeOutput.style->setProperty(cssPropertyId, stringValue, false, parserContext))
keyframeOutput.styleStrings.set(cssPropertyId, stringValue);
}
parsedKeyframes.append(WTFMove(keyframeOutput));
return { };
});
return { };
}
static inline ExceptionOr<void> processPropertyIndexedKeyframes(JSGlobalObject& lexicalGlobalObject, Document& document, Strong<JSObject>&& keyframesInput, Vector<KeyframeEffect::ParsedKeyframe>& parsedKeyframes, Vector<String>& unusedEasings)
{
// 1. Let property-indexed keyframe be the result of running the procedure to process a keyframe-like object passing object as the keyframe input.
auto processKeyframeLikeObjectResult = processKeyframeLikeObject(lexicalGlobalObject, document, WTFMove(keyframesInput), true);
if (processKeyframeLikeObjectResult.hasException())
return processKeyframeLikeObjectResult.releaseException();
auto propertyIndexedKeyframe = processKeyframeLikeObjectResult.returnValue();
CSSParserContext parserContext(document);
// 2. For each member, m, in property-indexed keyframe, perform the following steps:
for (auto& m : propertyIndexedKeyframe.propertiesAndValues) {
// 1. Let property name be the key for m.
auto propertyName = m.property;
// 2. If property name is “composite”, or “easing”, or “offset”, skip the remaining steps in this loop and continue from the next member in property-indexed
// keyframe after m.
// We skip this test since we split those properties and the actual CSS properties that we're currently iterating over.
// 3. Let property values be the value for m.
auto propertyValues = m.values;
// 4. Let property keyframes be an empty sequence of keyframes.
Vector<KeyframeEffect::ParsedKeyframe> propertyKeyframes;
// 5. For each value, v, in property values perform the following steps:
for (auto& v : propertyValues) {
// 1. Let k be a new keyframe with a null keyframe offset.
KeyframeEffect::ParsedKeyframe k;
// 2. Add the property-value pair, property name → v, to k.
if (propertyName == CSSPropertyCustom) {
auto customProperty = m.customProperty;
if (k.style->setCustomProperty(customProperty, v, false, parserContext))
k.customStyleStrings.set(customProperty, v);
} else if (k.style->setProperty(propertyName, v, false, parserContext))
k.styleStrings.set(propertyName, v);
// 3. Append k to property keyframes.
propertyKeyframes.append(WTFMove(k));
}
// 6. Apply the procedure to compute missing keyframe offsets to property keyframes.
computeMissingKeyframeOffsets(propertyKeyframes);
// 7. Add keyframes in property keyframes to processed keyframes.
parsedKeyframes.appendVector(propertyKeyframes);
}
// 3. Sort processed keyframes by the computed keyframe offset of each keyframe in increasing order.
std::sort(parsedKeyframes.begin(), parsedKeyframes.end(), [](auto& lhs, auto& rhs) {
return lhs.computedOffset < rhs.computedOffset;
});
// 4. Merge adjacent keyframes in processed keyframes when they have equal computed keyframe offsets.
size_t i = 1;
while (i < parsedKeyframes.size()) {
auto& keyframe = parsedKeyframes[i];
auto& previousKeyframe = parsedKeyframes[i - 1];
// If the offsets of this keyframe and the previous keyframe are different,
// this means that the two keyframes should not be merged and we can move
// on to the next keyframe.
if (keyframe.computedOffset != previousKeyframe.computedOffset) {
i++;
continue;
}
// Otherwise, both this keyframe and the previous keyframe should be merged.
// Unprocessed keyframes in parsedKeyframes at this stage have at most a single
// property in cssPropertiesAndValues, so just set this on the previous keyframe.
// In case an invalid or null value was originally provided, then the property
// was not set and the property count is 0, in which case there is nothing to merge.
if (keyframe.styleStrings.size()) {
previousKeyframe.style->mergeAndOverrideOnConflict(keyframe.style);
for (auto& [property, value] : keyframe.styleStrings)
previousKeyframe.styleStrings.set(property, value);
}
if (keyframe.customStyleStrings.size()) {
previousKeyframe.style->mergeAndOverrideOnConflict(keyframe.style);
for (auto& [customProperty, value] : keyframe.customStyleStrings)
previousKeyframe.customStyleStrings.set(customProperty, value);
}
// Since we've processed this keyframe, we can remove it and keep i the same
// so that we process the next keyframe in the next loop iteration.
parsedKeyframes.remove(i);
}
// 5. Let offsets be a sequence of nullable double values assigned based on the type of the “offset” member of the property-indexed keyframe as follows:
// - sequence<double?>, the value of “offset” as-is.
// - double?, a sequence of length one with the value of “offset” as its single item, i.e. « offset »,
Vector<std::optional<double>> offsets;
if (std::holds_alternative<Vector<std::optional<double>>>(propertyIndexedKeyframe.baseProperties.offset))
offsets = std::get<Vector<std::optional<double>>>(propertyIndexedKeyframe.baseProperties.offset);
else if (std::holds_alternative<double>(propertyIndexedKeyframe.baseProperties.offset))
offsets.append(std::get<double>(propertyIndexedKeyframe.baseProperties.offset));
else if (std::holds_alternative<std::nullptr_t>(propertyIndexedKeyframe.baseProperties.offset))
offsets.append(std::nullopt);
// 6. Assign each value in offsets to the keyframe offset of the keyframe with corresponding position in property keyframes until the end of either sequence is reached.
for (size_t i = 0; i < offsets.size() && i < parsedKeyframes.size(); ++i)
parsedKeyframes[i].offset = offsets[i];
// 7. Let easings be a sequence of DOMString values assigned based on the type of the “easing” member of the property-indexed keyframe as follows:
// - sequence<DOMString>, the value of “easing” as-is.
// - DOMString, a sequence of length one with the value of “easing” as its single item, i.e. « easing »,
Vector<String> easings;
if (std::holds_alternative<Vector<String>>(propertyIndexedKeyframe.baseProperties.easing))
easings = std::get<Vector<String>>(propertyIndexedKeyframe.baseProperties.easing);
else if (std::holds_alternative<String>(propertyIndexedKeyframe.baseProperties.easing))
easings.append(std::get<String>(propertyIndexedKeyframe.baseProperties.easing));
// 8. If easings is an empty sequence, let it be a sequence of length one containing the single value “linear”, i.e. « "linear" ».
if (easings.isEmpty())
easings.append("linear"_s);
// 9. If easings has fewer items than property keyframes, repeat the elements in easings successively starting from the beginning of the list until easings has as many
// items as property keyframes.
if (easings.size() < parsedKeyframes.size()) {
size_t initialNumberOfEasings = easings.size();
for (i = initialNumberOfEasings; i < parsedKeyframes.size(); ++i)
easings.append(easings[i % initialNumberOfEasings]);
}
// 10. If easings has more items than property keyframes, store the excess items as unused easings.
while (easings.size() > parsedKeyframes.size())
unusedEasings.append(easings.takeLast());
// 11. Assign each value in easings to a property named “easing” on the keyframe with the corresponding position in property keyframes until the end of property keyframes
// is reached.
for (size_t i = 0; i < parsedKeyframes.size(); ++i)
parsedKeyframes[i].easing = easings[i];
// 12. If the “composite” member of the property-indexed keyframe is not an empty sequence:
if (document.settings().webAnimationsCompositeOperationsEnabled()) {
Vector<CompositeOperationOrAuto> compositeModes;
if (std::holds_alternative<Vector<CompositeOperationOrAuto>>(propertyIndexedKeyframe.baseProperties.composite))
compositeModes = std::get<Vector<CompositeOperationOrAuto>>(propertyIndexedKeyframe.baseProperties.composite);
else if (std::holds_alternative<CompositeOperationOrAuto>(propertyIndexedKeyframe.baseProperties.composite))
compositeModes.append(std::get<CompositeOperationOrAuto>(propertyIndexedKeyframe.baseProperties.composite));
if (!compositeModes.isEmpty()) {
// 1. Let composite modes be a sequence of CompositeOperationOrAuto values assigned from the “composite” member of property-indexed keyframe. If that member is a single
// CompositeOperationOrAuto value operation, let composite modes be a sequence of length one, with the value of the “composite” as its single item.
// 2. As with easings, if composite modes has fewer items than processed keyframes, repeat the elements in composite modes successively starting from the beginning of
// the list until composite modes has as many items as processed keyframes.
if (compositeModes.size() < parsedKeyframes.size()) {
size_t initialNumberOfCompositeModes = compositeModes.size();
for (i = initialNumberOfCompositeModes; i < parsedKeyframes.size(); ++i)
compositeModes.append(compositeModes[i % initialNumberOfCompositeModes]);
}
// 3. Assign each value in composite modes that is not auto to the keyframe-specific composite operation on the keyframe with the corresponding position in processed
// keyframes until the end of processed keyframes is reached.
for (size_t i = 0; i < compositeModes.size() && i < parsedKeyframes.size(); ++i) {
if (compositeModes[i] != CompositeOperationOrAuto::Auto)
parsedKeyframes[i].composite = compositeModes[i];
}
}
}
return { };
}
ExceptionOr<Ref<KeyframeEffect>> KeyframeEffect::create(JSGlobalObject& lexicalGlobalObject, Document& document, Element* target, Strong<JSObject>&& keyframes, std::optional<std::variant<double, KeyframeEffectOptions>>&& options)
{
auto keyframeEffect = adoptRef(*new KeyframeEffect(target, PseudoId::None));
if (options) {
OptionalEffectTiming timing;
auto optionsValue = options.value();
if (std::holds_alternative<double>(optionsValue)) {
std::variant<double, String> duration = std::get<double>(optionsValue);
timing.duration = duration;
} else {
auto keyframeEffectOptions = std::get<KeyframeEffectOptions>(optionsValue);
auto setPseudoElementResult = keyframeEffect->setPseudoElement(keyframeEffectOptions.pseudoElement);
if (setPseudoElementResult.hasException())
return setPseudoElementResult.releaseException();
timing = {
keyframeEffectOptions.duration,
keyframeEffectOptions.iterations,
keyframeEffectOptions.delay,
keyframeEffectOptions.endDelay,
keyframeEffectOptions.iterationStart,
keyframeEffectOptions.easing,
keyframeEffectOptions.fill,
keyframeEffectOptions.direction
};
if (document.settings().webAnimationsCompositeOperationsEnabled())
keyframeEffect->setComposite(keyframeEffectOptions.composite);
if (document.settings().webAnimationsIterationCompositeEnabled())
keyframeEffect->setIterationComposite(keyframeEffectOptions.iterationComposite);
}
auto updateTimingResult = keyframeEffect->updateTiming(timing);
if (updateTimingResult.hasException())
return updateTimingResult.releaseException();
}
auto processKeyframesResult = keyframeEffect->processKeyframes(lexicalGlobalObject, document, WTFMove(keyframes));
if (processKeyframesResult.hasException())
return processKeyframesResult.releaseException();
return keyframeEffect;
}
Ref<KeyframeEffect> KeyframeEffect::create(Ref<KeyframeEffect>&& source)
{
auto keyframeEffect = adoptRef(*new KeyframeEffect(nullptr, PseudoId::None));
keyframeEffect->copyPropertiesFromSource(WTFMove(source));
return keyframeEffect;
}
Ref<KeyframeEffect> KeyframeEffect::create(const Element& target, PseudoId pseudoId)
{
return adoptRef(*new KeyframeEffect(const_cast<Element*>(&target), pseudoId));
}
KeyframeEffect::KeyframeEffect(Element* target, PseudoId pseudoId)
: m_keyframesName(makeAtomString("keyframe-effect-"_s, UUID::createVersion4Weak()))
, m_target(target)
, m_pseudoId(pseudoId)
{
}
void KeyframeEffect::copyPropertiesFromSource(Ref<KeyframeEffect>&& source)
{
m_target = source->m_target;
m_pseudoId = source->m_pseudoId;
m_compositeOperation = source->m_compositeOperation;
m_iterationCompositeOperation = source->m_iterationCompositeOperation;
Vector<ParsedKeyframe> parsedKeyframes;
for (auto& sourceParsedKeyframe : source->m_parsedKeyframes) {
ParsedKeyframe parsedKeyframe;
parsedKeyframe.easing = sourceParsedKeyframe.easing;
parsedKeyframe.offset = sourceParsedKeyframe.offset;
parsedKeyframe.composite = sourceParsedKeyframe.composite;
parsedKeyframe.styleStrings = sourceParsedKeyframe.styleStrings;
parsedKeyframe.customStyleStrings = sourceParsedKeyframe.customStyleStrings;
parsedKeyframe.computedOffset = sourceParsedKeyframe.computedOffset;
parsedKeyframe.timingFunction = sourceParsedKeyframe.timingFunction;
parsedKeyframe.style = sourceParsedKeyframe.style->mutableCopy();
parsedKeyframes.append(WTFMove(parsedKeyframe));
}
m_parsedKeyframes = WTFMove(parsedKeyframes);
setFill(source->fill());
setDelay(source->delay());
setEndDelay(source->endDelay());
setDirection(source->direction());
setIterations(source->iterations());
setTimingFunction(source->timingFunction());
setIterationStart(source->iterationStart());
setIterationDuration(source->iterationDuration());
updateStaticTimingProperties();
KeyframeList keyframeList(m_keyframesName);
keyframeList.copyKeyframes(source->m_blendingKeyframes);
setBlendingKeyframes(keyframeList);
}
auto KeyframeEffect::getKeyframes(Document& document) -> Vector<ComputedKeyframe>
{
// https://drafts.csswg.org/web-animations-1/#dom-keyframeeffectreadonly-getkeyframes
if (auto* declarativeAnimation = dynamicDowncast<DeclarativeAnimation>(animation()))
declarativeAnimation->flushPendingStyleChanges();
Vector<ComputedKeyframe> computedKeyframes;
if (!m_parsedKeyframes.isEmpty() || m_blendingKeyframesSource == BlendingKeyframesSource::WebAnimation || !m_blendingKeyframes.containsAnimatableProperty()) {
for (size_t i = 0; i < m_parsedKeyframes.size(); ++i) {
auto& parsedKeyframe = m_parsedKeyframes[i];
ComputedKeyframe computedKeyframe { parsedKeyframe };
for (auto& [cssPropertyId, stringValue] : computedKeyframe.styleStrings) {
if (cssPropertyId == CSSPropertyCustom)
continue;
if (auto cssValue = parsedKeyframe.style->getPropertyCSSValue(cssPropertyId))
stringValue = cssValue->cssText();
}
computedKeyframe.easing = timingFunctionForKeyframeAtIndex(i)->cssText();
computedKeyframes.append(WTFMove(computedKeyframe));
}
return computedKeyframes;
}
auto* target = m_target.get();
auto* lastStyleChangeEventStyle = targetStyleable()->lastStyleChangeEventStyle();
auto& elementStyle = lastStyleChangeEventStyle ? *lastStyleChangeEventStyle : currentStyle();
ComputedStyleExtractor computedStyleExtractor { target, false, m_pseudoId };
KeyframeList computedKeyframeList(m_blendingKeyframes.animationName());
computedKeyframeList.copyKeyframes(m_blendingKeyframes);
computedKeyframeList.fillImplicitKeyframes(*this, elementStyle);
auto keyframeRules = [&]() -> const Vector<Ref<StyleRuleKeyframe>> {
if (!is<CSSAnimation>(animation()))
return { };
if (!m_target || !m_target->isConnected())
return { };
auto& backingAnimation = downcast<CSSAnimation>(*animation()).backingAnimation();
auto* styleScope = Style::Scope::forOrdinal(*m_target, backingAnimation.nameStyleScopeOrdinal());
if (!styleScope)
return { };
return styleScope->resolver().keyframeRulesForName(computedKeyframeList.animationName());
}();
auto keyframeRuleForKey = [&](double key) -> StyleRuleKeyframe* {
for (auto& keyframeRule : keyframeRules) {
for (auto keyframeRuleKey : keyframeRule->keys()) {
if (keyframeRuleKey == key)
return keyframeRule.ptr();
}
}
return nullptr;
};
auto styleProperties = MutableStyleProperties::create();
if (m_blendingKeyframesSource == BlendingKeyframesSource::CSSAnimation) {
auto matchingRules = m_target->styleResolver().pseudoStyleRulesForElement(target, m_pseudoId, Style::Resolver::AllCSSRules);
for (auto& matchedRule : matchingRules)
styleProperties->mergeAndOverrideOnConflict(matchedRule->properties());
if (is<StyledElement>(m_target) && m_pseudoId == PseudoId::None) {
if (auto* inlineProperties = downcast<StyledElement>(*m_target).inlineStyle())
styleProperties->mergeAndOverrideOnConflict(*inlineProperties);
}
}
for (auto& keyframe : computedKeyframeList) {
auto& style = *keyframe.style();
auto* keyframeRule = keyframeRuleForKey(keyframe.key());
ComputedKeyframe computedKeyframe;
computedKeyframe.offset = keyframe.key();
computedKeyframe.computedOffset = keyframe.key();
// For CSS transitions, all keyframes should return "linear" since the effect's global timing function applies.
computedKeyframe.easing = is<CSSTransition>(animation()) ? "linear"_s : timingFunctionForBlendingKeyframe(keyframe)->cssText();
if (document.settings().webAnimationsCompositeOperationsEnabled()) {
if (auto compositeOperation = keyframe.compositeOperation())
computedKeyframe.composite = toCompositeOperationOrAuto(*compositeOperation);
}
auto addPropertyToKeyframe = [&](CSSPropertyID cssPropertyId) {
String styleString = emptyString();
if (keyframeRule) {
if (auto cssValue = keyframeRule->properties().getPropertyCSSValue(cssPropertyId)) {
if (!cssValue->hasVariableReferences())
styleString = keyframeRule->properties().getPropertyValue(cssPropertyId);
}
}
if (styleString.isEmpty()) {
if (auto cssValue = styleProperties->getPropertyCSSValue(cssPropertyId)) {
if (!cssValue->hasVariableReferences())
styleString = styleProperties->getPropertyValue(cssPropertyId);
}
}
if (styleString.isEmpty()) {
if (auto cssValue = computedStyleExtractor.valueForPropertyInStyle(style, cssPropertyId, nullptr, ComputedStyleExtractor::PropertyValueType::Computed))
styleString = cssValue->cssText();
}
computedKeyframe.styleStrings.set(cssPropertyId, styleString);
};
auto addCustomPropertyToKeyframe = [&](const AtomString& customProperty) {
String styleString = emptyString();
if (keyframeRule) {
if (auto cssValue = keyframeRule->properties().getCustomPropertyCSSValue(customProperty)) {
if (!cssValue->hasVariableReferences())
styleString = keyframeRule->properties().getCustomPropertyValue(customProperty);
}
}
if (styleString.isEmpty()) {
if (auto cssValue = styleProperties->getCustomPropertyCSSValue(customProperty)) {
if (!cssValue->hasVariableReferences())
styleString = styleProperties->getCustomPropertyValue(customProperty);
}
}
if (styleString.isEmpty()) {
if (auto cssValue = computedStyleExtractor.customPropertyValue(customProperty))
styleString = cssValue->cssText();
}
computedKeyframe.customStyleStrings.set(customProperty, styleString);
};
for (auto property : keyframe.properties()) {
WTF::switchOn(property,
[&] (CSSPropertyID cssProperty) {
addPropertyToKeyframe(cssProperty);
},
[&] (const AtomString& customProperty) {
if (m_blendingKeyframesSource != BlendingKeyframesSource::CSSAnimation)
addCustomPropertyToKeyframe(customProperty);
}
);
}
computedKeyframes.append(WTFMove(computedKeyframe));
}
return computedKeyframes;
}
ExceptionOr<void> KeyframeEffect::setBindingsKeyframes(JSGlobalObject& lexicalGlobalObject, Document& document, Strong<JSObject>&& keyframesInput)
{
auto retVal = setKeyframes(lexicalGlobalObject, document, WTFMove(keyframesInput));
if (!retVal.hasException() && is<CSSAnimation>(animation()))
downcast<CSSAnimation>(*animation()).effectKeyframesWereSetUsingBindings();
return retVal;
}
ExceptionOr<void> KeyframeEffect::setKeyframes(JSGlobalObject& lexicalGlobalObject, Document& document, Strong<JSObject>&& keyframesInput)
{
auto processKeyframesResult = processKeyframes(lexicalGlobalObject, document, WTFMove(keyframesInput));
if (!processKeyframesResult.hasException() && animation())
animation()->effectTimingDidChange();
return processKeyframesResult;
}
void KeyframeEffect::keyframesRuleDidChange()
{
ASSERT(is<CSSAnimation>(animation()));
clearBlendingKeyframes();
invalidate();
}
ExceptionOr<void> KeyframeEffect::processKeyframes(JSGlobalObject& lexicalGlobalObject, Document& document, Strong<JSObject>&& keyframesInput)
{
Ref protectedDocument { document };
// 1. If object is null, return an empty sequence of keyframes.
if (!keyframesInput.get())
return { };
VM& vm = lexicalGlobalObject.vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// 2. Let processed keyframes be an empty sequence of keyframes.
Vector<ParsedKeyframe> parsedKeyframes;
// 3. Let method be the result of GetMethod(object, @@iterator).
auto method = keyframesInput.get()->get(&lexicalGlobalObject, vm.propertyNames->iteratorSymbol);
// 4. Check the completion record of method.
RETURN_IF_EXCEPTION(scope, Exception { TypeError });
// 5. Perform the steps corresponding to the first matching condition from below,
Vector<String> unusedEasings;
if (!method.isUndefined()) {
auto retVal = processIterableKeyframes(lexicalGlobalObject, document, WTFMove(keyframesInput), WTFMove(method), parsedKeyframes);
if (retVal.hasException())
return retVal.releaseException();
} else {
auto retVal = processPropertyIndexedKeyframes(lexicalGlobalObject, document, WTFMove(keyframesInput), parsedKeyframes, unusedEasings);
if (retVal.hasException())
return retVal.releaseException();
}
// 6. If processed keyframes is not loosely sorted by offset, throw a TypeError and abort these steps.
// 7. If there exist any keyframe in processed keyframes whose keyframe offset is non-null and less than
// zero or greater than one, throw a TypeError and abort these steps.
double lastNonNullOffset = -1;
for (auto& keyframe : parsedKeyframes) {
if (!keyframe.offset)
continue;
auto offset = keyframe.offset.value();
if (offset < lastNonNullOffset || offset < 0 || offset > 1)
return Exception { TypeError };
lastNonNullOffset = offset;
}
// We take a slight detour from the spec text and compute the missing keyframe offsets right away
// since they can be computed up-front.
computeMissingKeyframeOffsets(parsedKeyframes);
// 8. For each frame in processed keyframes, perform the following steps:
for (auto& keyframe : parsedKeyframes) {
// Let the timing function of frame be the result of parsing the “easing” property on frame using the CSS syntax
// defined for the easing property of the AnimationEffectTiming interface.
// If parsing the “easing” property fails, throw a TypeError and abort this procedure.
auto timingFunctionResult = TimingFunction::createFromCSSText(keyframe.easing);
if (timingFunctionResult.hasException())
return timingFunctionResult.releaseException();
keyframe.timingFunction = timingFunctionResult.returnValue();
}
// 9. Parse each of the values in unused easings using the CSS syntax defined for easing property of the
// AnimationEffectTiming interface, and if any of the values fail to parse, throw a TypeError
// and abort this procedure.
for (auto& easing : unusedEasings) {
auto timingFunctionResult = TimingFunction::createFromCSSText(easing);
if (timingFunctionResult.hasException())
return timingFunctionResult.releaseException();
}
m_parsedKeyframes = WTFMove(parsedKeyframes);
clearBlendingKeyframes();
invalidate();
return { };
}
void KeyframeEffect::updateBlendingKeyframes(RenderStyle& elementStyle, const Style::ResolutionContext& resolutionContext)
{
if (!m_blendingKeyframes.isEmpty() || !m_target)
return;
KeyframeList keyframeList(m_keyframesName);
auto& styleResolver = m_target->styleResolver();
m_inheritedProperties.clear();
m_currentColorProperties.clear();
m_containsCSSVariableReferences = false;
m_hasRelativeFontWeight = false;
for (auto& keyframe : m_parsedKeyframes) {
KeyframeValue keyframeValue(keyframe.computedOffset, nullptr);
keyframeValue.setTimingFunction(keyframe.timingFunction->clone());
switch (keyframe.composite) {
case CompositeOperationOrAuto::Replace:
keyframeValue.setCompositeOperation(CompositeOperation::Replace);
break;
case CompositeOperationOrAuto::Add:
keyframeValue.setCompositeOperation(CompositeOperation::Add);
break;
case CompositeOperationOrAuto::Accumulate:
keyframeValue.setCompositeOperation(CompositeOperation::Accumulate);
break;
case CompositeOperationOrAuto::Auto:
break;
}
auto keyframeRule = StyleRuleKeyframe::create(keyframe.style->immutableCopyIfNeeded());
if (!m_containsCSSVariableReferences)
m_containsCSSVariableReferences = keyframeRule->containsCSSVariableReferences();
for (auto property : keyframeRule->properties()) {
if (auto* cssValue = property.value()) {
if (cssValue->isPrimitiveValue()) {
auto valueId = downcast<CSSPrimitiveValue>(*cssValue).valueID();
if (valueId == CSSValueInherit)
m_inheritedProperties.add(property.id());
else if (valueId == CSSValueCurrentcolor)
m_currentColorProperties.add(property.id());
else if (property.id() == CSSPropertyFontWeight && (valueId == CSSValueBolder || valueId == CSSValueLighter))
m_hasRelativeFontWeight = true;
} else if (auto* customPropertyValue = dynamicDowncast<CSSCustomPropertyValue>(cssValue)) {
if (customPropertyValue->isCurrentColor())
m_currentColorProperties.add(customPropertyValue->name());
}
}
}
keyframeValue.setStyle(styleResolver.styleForKeyframe(*m_target, elementStyle, resolutionContext, keyframeRule.get(), keyframeValue));
keyframeList.insert(WTFMove(keyframeValue));
}
setBlendingKeyframes(keyframeList);
}
const HashSet<AnimatableProperty>& KeyframeEffect::animatedProperties()
{
if (!m_blendingKeyframes.isEmpty())
return m_blendingKeyframes.properties();
if (m_animatedProperties.isEmpty()) {
for (auto& keyframe : m_parsedKeyframes) {
for (auto keyframeCustomProperty : keyframe.customStyleStrings.keys())
m_animatedProperties.add(keyframeCustomProperty);
for (auto keyframeProperty : keyframe.styleStrings.keys())
m_animatedProperties.add(keyframeProperty);
}
}
return m_animatedProperties;
}
bool KeyframeEffect::animatesProperty(AnimatableProperty property) const
{
if (!m_blendingKeyframes.isEmpty())
return m_blendingKeyframes.containsProperty(property);
return m_parsedKeyframes.findIf([&](const auto& keyframe) {
return WTF::switchOn(property,
[&](CSSPropertyID cssProperty) {
for (auto keyframeProperty : keyframe.styleStrings.keys()) {
if (keyframeProperty == cssProperty)
return true;
}
return false;
},
[&](const AtomString& customProperty) {
for (auto keyframeProperty : keyframe.customStyleStrings.keys()) {
if (keyframeProperty == customProperty)
return true;
}
return false;
}
);
}) != notFound;
}
bool KeyframeEffect::animatesDirectionAwareProperty() const
{
if (!m_blendingKeyframes.isEmpty())
return m_blendingKeyframes.containsDirectionAwareProperty();
for (auto& keyframe : m_parsedKeyframes) {
for (auto property : keyframe.styleStrings.keys()) {
if (CSSProperty::isDirectionAwareProperty(property))
return true;
}
}
return false;
}
bool KeyframeEffect::forceLayoutIfNeeded()
{
if (!m_needsForcedLayout || !m_target)
return false;
auto* renderer = this->renderer();
if (!renderer || !renderer->parent())