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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/animation/css_var_cycle_interpolation_type.h"
#include <memory>
#include <utility>
#include "base/memory/ptr_util.h"
#include "third_party/blink/renderer/core/animation/css_interpolation_environment.h"
#include "third_party/blink/renderer/core/animation/string_keyframe.h"
#include "third_party/blink/renderer/core/css/css_custom_property_declaration.h"
#include "third_party/blink/renderer/core/css/property_registration.h"
#include "third_party/blink/renderer/core/css/resolver/css_variable_resolver.h"
#include "third_party/blink/renderer/core/css/resolver/style_builder.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
namespace blink {
class CycleChecker : public InterpolationType::ConversionChecker {
public:
CycleChecker(const CSSCustomPropertyDeclaration& declaration,
bool cycle_detected)
: declaration_(declaration), cycle_detected_(cycle_detected) {}
private:
bool IsValid(const InterpolationEnvironment& environment,
const InterpolationValue&) const final {
DCHECK(ToCSSInterpolationEnvironment(environment).HasVariableResolver());
CSSVariableResolver& variable_resolver =
ToCSSInterpolationEnvironment(environment).VariableResolver();
bool cycle_detected = false;
variable_resolver.ResolveCustomPropertyAnimationKeyframe(*declaration_,
cycle_detected);
return cycle_detected == cycle_detected_;
}
Persistent<const CSSCustomPropertyDeclaration> declaration_;
const bool cycle_detected_;
};
CSSVarCycleInterpolationType::CSSVarCycleInterpolationType(
const PropertyHandle& property,
const PropertyRegistration& registration)
: InterpolationType(property), registration_(registration) {
DCHECK(property.IsCSSCustomProperty());
}
static InterpolationValue CreateCycleDetectedValue() {
return InterpolationValue(std::make_unique<InterpolableList>(0));
}
InterpolationValue CSSVarCycleInterpolationType::MaybeConvertSingle(
const PropertySpecificKeyframe& keyframe,
const InterpolationEnvironment& environment,
const InterpolationValue& underlying,
ConversionCheckers& conversion_checkers) const {
const auto& declaration = *To<CSSCustomPropertyDeclaration>(
ToCSSPropertySpecificKeyframe(keyframe).Value());
DCHECK_EQ(GetProperty().CustomPropertyName(), declaration.GetName());
if (!declaration.Value() || !declaration.Value()->NeedsVariableResolution()) {
return nullptr;
}
DCHECK(ToCSSInterpolationEnvironment(environment).HasVariableResolver());
CSSVariableResolver& variable_resolver =
ToCSSInterpolationEnvironment(environment).VariableResolver();
bool cycle_detected = false;
variable_resolver.ResolveCustomPropertyAnimationKeyframe(declaration,
cycle_detected);
conversion_checkers.push_back(
std::make_unique<CycleChecker>(declaration, cycle_detected));
return cycle_detected ? CreateCycleDetectedValue() : nullptr;
}
static bool IsCycleDetected(const InterpolationValue& value) {
return static_cast<bool>(value);
}
PairwiseInterpolationValue CSSVarCycleInterpolationType::MaybeConvertPairwise(
const PropertySpecificKeyframe& start_keyframe,
const PropertySpecificKeyframe& end_keyframe,
const InterpolationEnvironment& environment,
const InterpolationValue& underlying,
ConversionCheckers& conversionCheckers) const {
InterpolationValue start = MaybeConvertSingle(start_keyframe, environment,
underlying, conversionCheckers);
InterpolationValue end = MaybeConvertSingle(end_keyframe, environment,
underlying, conversionCheckers);
if (!IsCycleDetected(start) && !IsCycleDetected(end)) {
return nullptr;
}
// If either keyframe has a cyclic dependency then the entire interpolation
// unsets the custom property.
if (!start) {
start = CreateCycleDetectedValue();
}
if (!end) {
end = CreateCycleDetectedValue();
}
return PairwiseInterpolationValue(std::move(start.interpolable_value),
std::move(end.interpolable_value));
}
InterpolationValue CSSVarCycleInterpolationType::MaybeConvertUnderlyingValue(
const InterpolationEnvironment& environment) const {
const ComputedStyle& style =
ToCSSInterpolationEnvironment(environment).Style();
DCHECK(!style.GetVariable(GetProperty().CustomPropertyName()) ||
!style.GetVariable(GetProperty().CustomPropertyName())
->NeedsVariableResolution());
return nullptr;
}
void CSSVarCycleInterpolationType::Apply(
const InterpolableValue&,
const NonInterpolableValue*,
InterpolationEnvironment& environment) const {
StyleBuilder::ApplyProperty(
GetProperty().GetCSSPropertyName(),
ToCSSInterpolationEnvironment(environment).GetState(),
*MakeGarbageCollected<CSSCustomPropertyDeclaration>(
GetProperty().CustomPropertyName(), CSSValueID::kUnset));
}
} // namespace blink
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