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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef mozilla_ComputedTimingFunction_h
#define mozilla_ComputedTimingFunction_h
#include "nsDebug.h"
#include "nsStringFwd.h"
#include "nsTimingFunction.h"
#include "mozilla/Assertions.h"
#include "mozilla/Maybe.h"
#include "mozilla/SMILKeySpline.h"
namespace mozilla {
class ComputedTimingFunction {
public:
enum class Type : uint8_t {
Ease = uint8_t(StyleTimingKeyword::Ease), // ease
Linear = uint8_t(StyleTimingKeyword::Linear), // linear
EaseIn = uint8_t(StyleTimingKeyword::EaseIn), // ease-in
EaseOut = uint8_t(StyleTimingKeyword::EaseOut), // ease-out
EaseInOut = uint8_t(StyleTimingKeyword::EaseInOut), // ease-in-out
CubicBezier, // cubic-bezier()
Step, // step-start | step-end | steps()
};
struct StepFunc {
uint32_t mSteps;
StyleStepPosition mPos;
bool operator==(const StepFunc& aOther) const {
return mSteps == aOther.mSteps && mPos == aOther.mPos;
}
};
static ComputedTimingFunction CubicBezier(double x1, double y1, double x2,
double y2) {
return ComputedTimingFunction(x1, y1, x2, y2);
}
static ComputedTimingFunction Steps(uint32_t aSteps, StyleStepPosition aPos) {
MOZ_ASSERT(aSteps > 0, "The number of steps should be 1 or more");
return ComputedTimingFunction(aSteps, aPos);
}
ComputedTimingFunction() = default;
explicit ComputedTimingFunction(const nsTimingFunction& aFunction) {
Init(aFunction);
}
void Init(const nsTimingFunction& aFunction);
// BeforeFlag is used in step timing function.
// https://drafts.csswg.org/css-easing/#before-flag
enum class BeforeFlag { Unset, Set };
double GetValue(double aPortion, BeforeFlag aBeforeFlag) const;
const SMILKeySpline* GetFunction() const {
NS_ASSERTION(HasSpline(), "Type mismatch");
return &mTimingFunction;
}
Type GetType() const { return mType; }
bool HasSpline() const { return mType != Type::Step; }
const StepFunc& GetSteps() const {
MOZ_ASSERT(mType == Type::Step);
return mSteps;
}
bool operator==(const ComputedTimingFunction& aOther) const {
return mType == aOther.mType &&
(HasSpline() ? mTimingFunction == aOther.mTimingFunction
: mSteps == aOther.mSteps);
}
bool operator!=(const ComputedTimingFunction& aOther) const {
return !(*this == aOther);
}
bool operator==(const nsTimingFunction& aOther) const {
switch (aOther.mTiming.tag) {
case StyleComputedTimingFunction::Tag::Keyword:
return uint8_t(mType) == uint8_t(aOther.mTiming.keyword._0);
case StyleComputedTimingFunction::Tag::CubicBezier:
return mTimingFunction.X1() == aOther.mTiming.cubic_bezier.x1 &&
mTimingFunction.Y1() == aOther.mTiming.cubic_bezier.y1 &&
mTimingFunction.X2() == aOther.mTiming.cubic_bezier.x2 &&
mTimingFunction.Y2() == aOther.mTiming.cubic_bezier.y2;
case StyleComputedTimingFunction::Tag::Steps:
return mSteps.mSteps == uint32_t(aOther.mTiming.steps._0) &&
mSteps.mPos == aOther.mTiming.steps._1;
default:
return false;
}
}
bool operator!=(const nsTimingFunction& aOther) const {
return !(*this == aOther);
}
int32_t Compare(const ComputedTimingFunction& aRhs) const;
void AppendToString(nsACString& aResult) const;
static double GetPortion(const Maybe<ComputedTimingFunction>& aFunction,
double aPortion, BeforeFlag aBeforeFlag) {
return aFunction ? aFunction->GetValue(aPortion, aBeforeFlag) : aPortion;
}
static int32_t Compare(const Maybe<ComputedTimingFunction>& aLhs,
const Maybe<ComputedTimingFunction>& aRhs);
private:
ComputedTimingFunction(double x1, double y1, double x2, double y2)
: mType(Type::CubicBezier), mTimingFunction(x1, y1, x2, y2) {}
ComputedTimingFunction(uint32_t aSteps, StyleStepPosition aPos)
: mType(Type::Step), mSteps{aSteps, aPos} {}
Type mType;
SMILKeySpline mTimingFunction;
StepFunc mSteps;
};
inline bool operator==(const Maybe<ComputedTimingFunction>& aLHS,
const nsTimingFunction& aRHS) {
if (aLHS.isNothing()) {
return aRHS.IsLinear();
}
return aLHS.value() == aRHS;
}
inline bool operator!=(const Maybe<ComputedTimingFunction>& aLHS,
const nsTimingFunction& aRHS) {
return !(aLHS == aRHS);
}
} // namespace mozilla
#endif // mozilla_ComputedTimingFunction_h
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