From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- dom/smil/SMILMilestone.h | 75 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 dom/smil/SMILMilestone.h (limited to 'dom/smil/SMILMilestone.h') diff --git a/dom/smil/SMILMilestone.h b/dom/smil/SMILMilestone.h new file mode 100644 index 0000000000..8b9372428f --- /dev/null +++ b/dom/smil/SMILMilestone.h @@ -0,0 +1,75 @@ +/* -*- 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 DOM_SMIL_SMILMILESTONE_H_ +#define DOM_SMIL_SMILMILESTONE_H_ + +#include "mozilla/SMILTypes.h" + +namespace mozilla { + +/* + * A significant moment in an SMILTimedElement's lifetime where a sample is + * required. + * + * Animations register the next milestone in their lifetime with the time + * container that they belong to. When the animation controller goes to run + * a sample it first visits all the animations that have a registered milestone + * in order of their milestone times. This allows interdependencies between + * animations to be correctly resolved and events to fire in the proper order. + * + * A distinction is made between a milestone representing the end of an interval + * and any other milestone. This is because if animation A ends at time t, and + * animation B begins at the same time t (or has some other significant moment + * such as firing a repeat event), SMIL's endpoint-exclusive timing model + * implies that the interval end occurs first. In fact, interval ends can be + * thought of as ending an infinitesimally small time before t. Therefore, + * A should be sampled before B. + * + * Furthermore, this distinction between sampling the end of an interval and + * a regular sample is used within the timing model (specifically in + * SMILTimedElement) to ensure that all intervals ending at time t are sampled + * before any new intervals are entered so that we have a fully up-to-date set + * of instance times available before committing to a new interval. Once an + * interval is entered, the begin time is fixed. + */ +class SMILMilestone { + public: + SMILMilestone(SMILTime aTime, bool aIsEnd) : mTime(aTime), mIsEnd(aIsEnd) {} + + SMILMilestone() : mTime(0), mIsEnd(false) {} + + bool operator==(const SMILMilestone& aOther) const { + return mTime == aOther.mTime && mIsEnd == aOther.mIsEnd; + } + + bool operator!=(const SMILMilestone& aOther) const { + return !(*this == aOther); + } + + bool operator<(const SMILMilestone& aOther) const { + // Earlier times sort first, and for equal times end milestones sort first + return mTime < aOther.mTime || + (mTime == aOther.mTime && mIsEnd && !aOther.mIsEnd); + } + + bool operator<=(const SMILMilestone& aOther) const { + return *this == aOther || *this < aOther; + } + + bool operator>=(const SMILMilestone& aOther) const { + return !(*this < aOther); + } + + SMILTime mTime; // The milestone time. This may be in container time or + // parent container time depending on where it is used. + bool mIsEnd; // true if this milestone corresponds to an interval + // end, false otherwise. +}; + +} // namespace mozilla + +#endif // DOM_SMIL_SMILMILESTONE_H_ -- cgit v1.2.3