mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
80 lines
2.9 KiB
C++
80 lines
2.9 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 NS_SMILMILESTONE_H_
|
|
#define NS_SMILMILESTONE_H_
|
|
|
|
/*
|
|
* A significant moment in an nsSMILTimedElement'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
|
|
* nsSMILTimedElement) 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 nsSMILMilestone
|
|
{
|
|
public:
|
|
nsSMILMilestone(nsSMILTime aTime, bool aIsEnd)
|
|
: mTime(aTime), mIsEnd(aIsEnd)
|
|
{ }
|
|
|
|
nsSMILMilestone()
|
|
: mTime(0), mIsEnd(false)
|
|
{ }
|
|
|
|
bool operator==(const nsSMILMilestone& aOther) const
|
|
{
|
|
return mTime == aOther.mTime && mIsEnd == aOther.mIsEnd;
|
|
}
|
|
|
|
bool operator!=(const nsSMILMilestone& aOther) const
|
|
{
|
|
return !(*this == aOther);
|
|
}
|
|
|
|
bool operator<(const nsSMILMilestone& 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 nsSMILMilestone& aOther) const
|
|
{
|
|
return *this == aOther || *this < aOther;
|
|
}
|
|
|
|
bool operator>=(const nsSMILMilestone& aOther) const
|
|
{
|
|
return !(*this < aOther);
|
|
}
|
|
|
|
nsSMILTime 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.
|
|
};
|
|
|
|
#endif // NS_SMILMILESTONE_H_
|