gecko-dev/dom/animation/ComputedTimingFunction.h

111 строки
3.6 KiB
C++

/* -*- 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 "nsSMILKeySpline.h" // nsSMILKeySpline
#include "nsStyleStruct.h" // nsTimingFunction
namespace mozilla {
class ComputedTimingFunction
{
public:
static ComputedTimingFunction
CubicBezier(double x1, double y1, double x2, double y2)
{
return ComputedTimingFunction(x1, y1, x2, y2);
}
static ComputedTimingFunction
Steps(nsTimingFunction::Type aType, uint32_t aSteps)
{
MOZ_ASSERT(aType == nsTimingFunction::Type::StepStart ||
aType == nsTimingFunction::Type::StepEnd,
"The type of timing function should be either step-start or "
"step-end");
MOZ_ASSERT(aSteps > 0, "The number of steps should be 1 or more");
return ComputedTimingFunction(aType, aSteps);
}
static ComputedTimingFunction
Frames(uint32_t aFrames)
{
MOZ_ASSERT(aFrames > 1, "The number of frames should be 2 or more");
return ComputedTimingFunction(nsTimingFunction::Type::Frames, aFrames);
}
ComputedTimingFunction() = default;
explicit ComputedTimingFunction(const nsTimingFunction& aFunction)
{
Init(aFunction);
}
void Init(const nsTimingFunction& aFunction);
// BeforeFlag is used in step timing function.
// https://w3c.github.io/web-animations/#before-flag
enum class BeforeFlag {
Unset,
Set
};
double GetValue(double aPortion, BeforeFlag aBeforeFlag) const;
const nsSMILKeySpline* GetFunction() const
{
NS_ASSERTION(HasSpline(), "Type mismatch");
return &mTimingFunction;
}
nsTimingFunction::Type GetType() const { return mType; }
bool HasSpline() const { return nsTimingFunction::IsSplineType(mType); }
uint32_t GetSteps() const
{
MOZ_ASSERT(mType == nsTimingFunction::Type::StepStart ||
mType == nsTimingFunction::Type::StepEnd);
return mStepsOrFrames;
}
uint32_t GetFrames() const
{
MOZ_ASSERT(mType == nsTimingFunction::Type::Frames);
return mStepsOrFrames;
}
bool operator==(const ComputedTimingFunction& aOther) const
{
return mType == aOther.mType &&
(HasSpline() ?
mTimingFunction == aOther.mTimingFunction :
mStepsOrFrames == aOther.mStepsOrFrames);
}
bool operator!=(const ComputedTimingFunction& aOther) const
{
return !(*this == aOther);
}
int32_t Compare(const ComputedTimingFunction& aRhs) const;
void AppendToString(nsAString& 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(nsTimingFunction::Type::CubicBezier)
, mTimingFunction(x1, y1, x2, y2) { }
ComputedTimingFunction(nsTimingFunction::Type aType, uint32_t aStepsOrFrames)
: mType(aType)
, mStepsOrFrames(aStepsOrFrames) { }
nsTimingFunction::Type mType = nsTimingFunction::Type::Linear;
nsSMILKeySpline mTimingFunction;
uint32_t mStepsOrFrames;
};
} // namespace mozilla
#endif // mozilla_ComputedTimingFunction_h