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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_PRIMITIVE_INTERPOLATION_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_PRIMITIVE_INTERPOLATION_H_
#include <cmath>
#include <limits>
#include <memory>
#include <utility>
#include "base/check_op.h"
#include "base/memory/ptr_util.h"
#include "third_party/blink/renderer/core/animation/typed_interpolation_value.h"
#include "third_party/blink/renderer/platform/geometry/blend.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
// Represents an animation's effect between an adjacent pair of
// PropertySpecificKeyframes after converting the keyframes to an internal
// format with respect to the animation environment and underlying values.
class PrimitiveInterpolation : public GarbageCollected<PrimitiveInterpolation> {
public:
PrimitiveInterpolation(const PrimitiveInterpolation&) = delete;
PrimitiveInterpolation& operator=(const PrimitiveInterpolation&) = delete;
virtual ~PrimitiveInterpolation() = default;
virtual void InterpolateValue(
double fraction,
Member<TypedInterpolationValue>& result) const = 0;
virtual double InterpolateUnderlyingFraction(double start,
double end,
double fraction) const = 0;
virtual bool IsFlip() const { return false; }
virtual void Trace(Visitor*) const {}
protected:
PrimitiveInterpolation() = default;
};
// Represents a pair of keyframes that are compatible for "smooth" interpolation
// eg. "0px" and "100px".
class PairwisePrimitiveInterpolation : public PrimitiveInterpolation {
public:
PairwisePrimitiveInterpolation(
const InterpolationType* type,
InterpolableValue* start,
InterpolableValue* end,
const NonInterpolableValue* non_interpolable_value)
: type_(type),
start_(start),
end_(end),
non_interpolable_value_(non_interpolable_value) {
DCHECK(start_);
DCHECK(end_);
}
~PairwisePrimitiveInterpolation() override = default;
const InterpolationType* GetType() const { return type_; }
TypedInterpolationValue* InitialValue() const {
return MakeGarbageCollected<TypedInterpolationValue>(
type_, start_->Clone(), non_interpolable_value_);
}
void Trace(Visitor* v) const override {
PrimitiveInterpolation::Trace(v);
v->Trace(type_);
v->Trace(start_);
v->Trace(end_);
v->Trace(non_interpolable_value_);
}
private:
void InterpolateValue(double fraction,
Member<TypedInterpolationValue>& result) const final {
DCHECK(result);
DCHECK_EQ(result->GetType(), type_);
DCHECK_EQ(result->GetNonInterpolableValue(), non_interpolable_value_.Get());
start_->AssertCanInterpolateWith(*end_);
start_->Interpolate(*end_, fraction,
*result->MutableValue().interpolable_value);
}
double InterpolateUnderlyingFraction(double start,
double end,
double fraction) const final {
return Blend(start, end, fraction);
}
Member<const InterpolationType> type_;
Member<InterpolableValue> start_;
Member<InterpolableValue> end_;
Member<const NonInterpolableValue> non_interpolable_value_;
};
// Represents a pair of incompatible keyframes that fall back to 50% flip
// behaviour eg. "auto" and "0px".
class FlipPrimitiveInterpolation : public PrimitiveInterpolation {
public:
FlipPrimitiveInterpolation(TypedInterpolationValue* start,
TypedInterpolationValue* end)
: start_(start),
end_(end),
last_fraction_(std::numeric_limits<double>::quiet_NaN()) {}
~FlipPrimitiveInterpolation() override = default;
void Trace(Visitor* v) const override {
PrimitiveInterpolation::Trace(v);
v->Trace(start_);
v->Trace(end_);
}
private:
void InterpolateValue(double fraction,
Member<TypedInterpolationValue>& result) const final {
if (!std::isnan(last_fraction_) &&
(fraction < 0.5) == (last_fraction_ < 0.5)) {
return;
}
const TypedInterpolationValue* side =
((fraction < 0.5) ? start_ : end_).Get();
result = side ? side->Clone() : nullptr;
last_fraction_ = fraction;
}
double InterpolateUnderlyingFraction(double start,
double end,
double fraction) const final {
return fraction < 0.5 ? start : end;
}
bool IsFlip() const final { return true; }
Member<TypedInterpolationValue> start_;
Member<TypedInterpolationValue> end_;
mutable double last_fraction_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_PRIMITIVE_INTERPOLATION_H_
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