зеркало из https://github.com/mozilla/gecko-dev.git
127 строки
3.0 KiB
C++
127 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsTimingFunction_h
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#define nsTimingFunction_h
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#include "nsStyleConsts.h"
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struct nsTimingFunction
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{
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enum class Type {
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Ease, // ease
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Linear, // linear
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EaseIn, // ease-in
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EaseOut, // ease-out
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EaseInOut, // ease-in-out
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StepStart, // step-start and steps(..., start)
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StepEnd, // step-end, steps(..., end) and steps(...)
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CubicBezier, // cubic-bezier()
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Frames, // frames()
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};
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// Whether the timing function type is represented by a spline,
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// and thus will have mFunc filled in.
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static bool IsSplineType(Type aType)
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{
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return aType != Type::StepStart &&
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aType != Type::StepEnd &&
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aType != Type::Frames;
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}
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explicit nsTimingFunction(
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int32_t aTimingFunctionType = NS_STYLE_TRANSITION_TIMING_FUNCTION_EASE)
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: mType(Type::Ease)
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, mFunc{}
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{
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AssignFromKeyword(aTimingFunctionType);
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}
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nsTimingFunction(float x1, float y1, float x2, float y2)
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: mType(Type::CubicBezier)
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{
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mFunc.mX1 = x1;
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mFunc.mY1 = y1;
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mFunc.mX2 = x2;
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mFunc.mY2 = y2;
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}
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enum class Keyword { Implicit, Explicit };
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nsTimingFunction(Type aType, uint32_t aStepsOrFrames)
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: mType(aType)
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{
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MOZ_ASSERT(mType == Type::StepStart ||
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mType == Type::StepEnd ||
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mType == Type::Frames,
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"wrong type");
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mStepsOrFrames = aStepsOrFrames;
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}
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nsTimingFunction(const nsTimingFunction& aOther)
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{
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*this = aOther;
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}
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Type mType;
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union {
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struct {
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float mX1;
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float mY1;
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float mX2;
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float mY2;
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} mFunc;
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struct {
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uint32_t mStepsOrFrames;
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};
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};
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nsTimingFunction&
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operator=(const nsTimingFunction& aOther)
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{
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if (&aOther == this) {
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return *this;
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}
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mType = aOther.mType;
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if (HasSpline()) {
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mFunc.mX1 = aOther.mFunc.mX1;
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mFunc.mY1 = aOther.mFunc.mY1;
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mFunc.mX2 = aOther.mFunc.mX2;
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mFunc.mY2 = aOther.mFunc.mY2;
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} else {
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mStepsOrFrames = aOther.mStepsOrFrames;
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}
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return *this;
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}
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bool operator==(const nsTimingFunction& aOther) const
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{
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if (mType != aOther.mType) {
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return false;
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}
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if (HasSpline()) {
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return mFunc.mX1 == aOther.mFunc.mX1 && mFunc.mY1 == aOther.mFunc.mY1 &&
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mFunc.mX2 == aOther.mFunc.mX2 && mFunc.mY2 == aOther.mFunc.mY2;
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}
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return mStepsOrFrames == aOther.mStepsOrFrames;
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}
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bool operator!=(const nsTimingFunction& aOther) const
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{
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return !(*this == aOther);
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}
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bool HasSpline() const { return IsSplineType(mType); }
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private:
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void AssignFromKeyword(int32_t aTimingFunctionType);
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};
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#endif // nsTimingFunction_h
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