100 lines
3.2 KiB
C++
100 lines
3.2 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ComputedTimingFunction.h"
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#include "nsStyleUtil.h"
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namespace mozilla {
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void
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ComputedTimingFunction::Init(const nsTimingFunction &aFunction)
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{
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mType = aFunction.mType;
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if (nsTimingFunction::IsSplineType(mType)) {
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mTimingFunction.Init(aFunction.mFunc.mX1, aFunction.mFunc.mY1,
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aFunction.mFunc.mX2, aFunction.mFunc.mY2);
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} else {
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mSteps = aFunction.mSteps;
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mStepSyntax = aFunction.mStepSyntax;
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}
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}
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static inline double
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StepEnd(uint32_t aSteps, double aPortion)
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{
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MOZ_ASSERT(0.0 <= aPortion && aPortion <= 1.0, "out of range");
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uint32_t step = uint32_t(aPortion * aSteps); // floor
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return double(step) / double(aSteps);
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}
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double
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ComputedTimingFunction::GetValue(double aPortion) const
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{
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if (HasSpline()) {
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return mTimingFunction.GetSplineValue(aPortion);
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}
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if (mType == nsTimingFunction::Type::StepStart) {
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// There are diagrams in the spec that seem to suggest this check
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// and the bounds point should not be symmetric with StepEnd, but
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// should actually step up at rather than immediately after the
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// fraction points. However, we rely on rounding negative values
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// up to zero, so we can't do that. And it's not clear the spec
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// really meant it.
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return 1.0 - StepEnd(mSteps, 1.0 - aPortion);
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}
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MOZ_ASSERT(mType == nsTimingFunction::Type::StepEnd, "bad type");
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return StepEnd(mSteps, aPortion);
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}
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int32_t
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ComputedTimingFunction::Compare(const ComputedTimingFunction& aRhs) const
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{
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if (mType != aRhs.mType) {
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return int32_t(mType) - int32_t(aRhs.mType);
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}
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if (mType == nsTimingFunction::Type::CubicBezier) {
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int32_t order = mTimingFunction.Compare(aRhs.mTimingFunction);
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if (order != 0) {
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return order;
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}
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} else if (mType == nsTimingFunction::Type::StepStart ||
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mType == nsTimingFunction::Type::StepEnd) {
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if (mSteps != aRhs.mSteps) {
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return int32_t(mSteps) - int32_t(aRhs.mSteps);
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}
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if (mStepSyntax != aRhs.mStepSyntax) {
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return int32_t(mStepSyntax) - int32_t(aRhs.mStepSyntax);
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}
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}
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return 0;
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}
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void
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ComputedTimingFunction::AppendToString(nsAString& aResult) const
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{
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switch (mType) {
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case nsTimingFunction::Type::CubicBezier:
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nsStyleUtil::AppendCubicBezierTimingFunction(mTimingFunction.X1(),
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mTimingFunction.Y1(),
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mTimingFunction.X2(),
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mTimingFunction.Y2(),
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aResult);
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break;
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case nsTimingFunction::Type::StepStart:
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case nsTimingFunction::Type::StepEnd:
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nsStyleUtil::AppendStepsTimingFunction(mType, mSteps, mStepSyntax,
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aResult);
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break;
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default:
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nsStyleUtil::AppendCubicBezierKeywordTimingFunction(mType, aResult);
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break;
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}
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}
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} // namespace mozilla
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