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// Copyright 2015 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_length_interpolation_type.h"
#include <memory>
#include <utility>
#include "base/memory/ptr_util.h"
#include "third_party/blink/renderer/core/animation/length_interpolation_functions.h"
#include "third_party/blink/renderer/core/animation/length_property_functions.h"
#include "third_party/blink/renderer/core/css/css_identifier_value.h"
#include "third_party/blink/renderer/core/css/resolver/style_builder.h"
#include "third_party/blink/renderer/core/css/resolver/style_resolver_state.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/platform/geometry/length_functions.h"
namespace blink {
CSSLengthInterpolationType::CSSLengthInterpolationType(
PropertyHandle property,
const PropertyRegistration* registration)
: CSSInterpolationType(property, registration),
value_range_(LengthPropertyFunctions::GetValueRange(CssProperty())) {}
float CSSLengthInterpolationType::EffectiveZoom(
const ComputedStyle& style) const {
return LengthPropertyFunctions::IsZoomedLength(CssProperty())
? style.EffectiveZoom()
: 1;
}
class InheritedLengthChecker
: public CSSInterpolationType::CSSConversionChecker {
public:
InheritedLengthChecker(const CSSProperty& property, const Length& length)
: property_(property), length_(length) {}
private:
bool IsValid(const StyleResolverState& state,
const InterpolationValue& underlying) const final {
Length parent_length;
LengthPropertyFunctions::GetLength(property_, *state.ParentStyle(),
parent_length);
return parent_length == length_;
}
const CSSProperty& property_;
const Length length_;
};
InterpolationValue CSSLengthInterpolationType::MaybeConvertNeutral(
const InterpolationValue&,
ConversionCheckers&) const {
return InterpolationValue(
LengthInterpolationFunctions::CreateNeutralInterpolableValue());
}
InterpolationValue CSSLengthInterpolationType::MaybeConvertInitial(
const StyleResolverState&,
ConversionCheckers& conversion_checkers) const {
Length initial_length;
if (!LengthPropertyFunctions::GetInitialLength(CssProperty(), initial_length))
return nullptr;
return LengthInterpolationFunctions::MaybeConvertLength(initial_length, 1);
}
InterpolationValue CSSLengthInterpolationType::MaybeConvertInherit(
const StyleResolverState& state,
ConversionCheckers& conversion_checkers) const {
if (!state.ParentStyle())
return nullptr;
Length inherited_length;
LengthPropertyFunctions::GetLength(CssProperty(), *state.ParentStyle(),
inherited_length);
conversion_checkers.push_back(std::make_unique<InheritedLengthChecker>(
CssProperty(), inherited_length));
if (inherited_length.IsAuto()) {
// If the inherited value changes to a length, the InheritedLengthChecker
// will invalidate the interpolation's cache.
return nullptr;
}
return LengthInterpolationFunctions::MaybeConvertLength(
inherited_length, EffectiveZoom(*state.ParentStyle()));
}
InterpolationValue CSSLengthInterpolationType::MaybeConvertValue(
const CSSValue& value,
const StyleResolverState*,
ConversionCheckers& conversion_checkers) const {
if (auto* identifier_value = DynamicTo<CSSIdentifierValue>(value)) {
CSSValueID value_id = identifier_value->GetValueID();
double pixels;
if (!LengthPropertyFunctions::GetPixelsForKeyword(CssProperty(), value_id,
pixels))
return nullptr;
return InterpolationValue(
LengthInterpolationFunctions::CreateInterpolablePixels(pixels));
}
return LengthInterpolationFunctions::MaybeConvertCSSValue(value);
}
PairwiseInterpolationValue CSSLengthInterpolationType::MaybeMergeSingles(
InterpolationValue&& start,
InterpolationValue&& end) const {
return LengthInterpolationFunctions::MergeSingles(std::move(start),
std::move(end));
}
InterpolationValue
CSSLengthInterpolationType::MaybeConvertStandardPropertyUnderlyingValue(
const ComputedStyle& style) const {
Length underlying_length;
if (!LengthPropertyFunctions::GetLength(CssProperty(), style,
underlying_length))
return nullptr;
return LengthInterpolationFunctions::MaybeConvertLength(underlying_length,
EffectiveZoom(style));
}
const CSSValue* CSSLengthInterpolationType::CreateCSSValue(
const InterpolableValue& interpolable_value,
const NonInterpolableValue* non_interpolable_value,
const StyleResolverState&) const {
return LengthInterpolationFunctions::CreateCSSValue(
interpolable_value, non_interpolable_value, value_range_);
}
void CSSLengthInterpolationType::Composite(
UnderlyingValueOwner& underlying_value_owner,
double underlying_fraction,
const InterpolationValue& value,
double interpolation_fraction) const {
InterpolationValue& underlying = underlying_value_owner.MutableValue();
LengthInterpolationFunctions::Composite(
underlying.interpolable_value, underlying.non_interpolable_value,
underlying_fraction, *value.interpolable_value,
value.non_interpolable_value.get());
}
void CSSLengthInterpolationType::ApplyStandardPropertyValue(
const InterpolableValue& interpolable_value,
const NonInterpolableValue* non_interpolable_value,
StyleResolverState& state) const {
ComputedStyle& style = *state.Style();
float zoom = EffectiveZoom(style);
CSSToLengthConversionData conversion_data = state.CssToLengthConversionData();
conversion_data.SetZoom(zoom);
Length length = LengthInterpolationFunctions::CreateLength(
interpolable_value, non_interpolable_value, conversion_data,
value_range_);
if (LengthPropertyFunctions::SetLength(CssProperty(), style, length)) {
#if DCHECK_IS_ON()
// Assert that setting the length on ComputedStyle directly is identical to
// the StyleBuilder code path. This check is useful for catching differences
// in clamping behaviour.
Length before;
Length after;
DCHECK(LengthPropertyFunctions::GetLength(CssProperty(), style, before));
StyleBuilder::ApplyProperty(GetProperty().GetCSSProperty(), state,
*CSSValue::Create(length, zoom));
DCHECK(LengthPropertyFunctions::GetLength(CssProperty(), style, after));
DCHECK(before.IsSpecified());
DCHECK(after.IsSpecified());
const float kSlack = 0.1;
float delta =
FloatValueForLength(after, 100) - FloatValueForLength(before, 100);
DCHECK_LT(std::abs(delta), kSlack);
#endif
return;
}
StyleBuilder::ApplyProperty(GetProperty().GetCSSProperty(), state,
*CSSValue::Create(length, zoom));
}
} // namespace blink
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