gecko-dev/content/smil/nsSMILInstanceTime.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Mozilla SMIL module.
*
* The Initial Developer of the Original Code is Brian Birtles.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Brian Birtles <birtles@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef NS_SMILINSTANCETIME_H_
#define NS_SMILINSTANCETIME_H_
#include "nsSMILTimeValue.h"
#include "nsAutoPtr.h"
class nsSMILInterval;
class nsSMILTimeContainer;
class nsSMILTimeValueSpec;
//----------------------------------------------------------------------
// nsSMILInstanceTime
//
// An instant in document simple time that may be used in creating a new
// interval.
//
// For an overview of how this class is related to other SMIL time classes see
// the documentation in nsSMILTimeValue.h
//
// These objects are owned by an nsSMILTimedElement but may be referred to by
// nsSMILTimeValueSpec objects owned by the same nsSMILTimedElement.
//
// For example, a syncbase nsSMILTimeValueSpec such as 'a.begin' will generate
// instance times based on when 'a' begins and will give these instance times to
// the owner nsSMILTimedElement. It will also keep a pointer to the last created
// instance time so it can tell its owner nsSMILTimedElement to update or
// delete it.
//
// Furthermore, nsSMILInstanceTime objects may refer to other nsSMILInstanceTime
// objects to represent dependency chains that are used for resolving priorities
// within the animation sandwich.
class nsSMILInstanceTime
{
public:
// Instance time source. Times generated by events, syncbase relationships,
// and DOM calls behave differently in some circumstances such as when a timed
// element is reset.
enum nsSMILInstanceTimeSource {
// No particularly significant source, e.g. offset time, 'indefinite'
SOURCE_NONE,
// Generated by a DOM call such as beginElement
SOURCE_DOM,
// Generated by a syncbase relationship
SOURCE_SYNCBASE,
// Generated by an event
SOURCE_EVENT
};
nsSMILInstanceTime(const nsSMILTimeValue& aTime,
nsSMILInstanceTimeSource aSource = SOURCE_NONE,
nsSMILTimeValueSpec* aCreator = nsnull,
nsSMILInterval* aBaseInterval = nsnull);
~nsSMILInstanceTime();
void Unlink();
void HandleChangedInterval(const nsSMILTimeContainer* aSrcContainer,
PRBool aBeginObjectChanged,
PRBool aEndObjectChanged);
void HandleDeletedInterval();
const nsSMILTimeValue& Time() const { return mTime; }
const nsSMILTimeValueSpec* GetCreator() const { return mCreator; }
PRBool ClearOnReset() const { return !!(mFlags & kClearOnReset); }
PRBool MayUpdate() const { return !!(mFlags & kMayUpdate); }
PRBool FromDOM() const { return !!(mFlags & kFromDOM); }
void MarkNoLongerUpdating() { mFlags &= ~kMayUpdate; }
void DependentUpdate(const nsSMILTimeValue& aNewTime)
{
NS_ABORT_IF_FALSE(MayUpdate(),
"Updating an instance time that is not expected to be updated");
mTime = aNewTime;
}
PRBool IsDependent(const nsSMILInstanceTime& aOther,
PRUint32 aRecursionDepth = 0) const;
PRBool SameTimeAndBase(const nsSMILInstanceTime& aOther) const
{
return mTime == aOther.mTime && GetBaseTime() == aOther.GetBaseTime();
}
// Get and set a serial number which may be used by a containing class to
// control the sort order of otherwise similar instance times.
PRUint32 Serial() const { return mSerial; }
void SetSerial(PRUint32 aIndex) { mSerial = aIndex; }
nsrefcnt AddRef()
{
if (mRefCnt == PR_UINT32_MAX) {
NS_WARNING("refcount overflow, leaking nsSMILInstanceTime");
return mRefCnt;
}
NS_ASSERT_OWNINGTHREAD(_class);
NS_ABORT_IF_FALSE(_mOwningThread.GetThread() == PR_GetCurrentThread(),
"nsSMILInstanceTime addref isn't thread-safe!");
++mRefCnt;
NS_LOG_ADDREF(this, mRefCnt, "nsSMILInstanceTime", sizeof(*this));
return mRefCnt;
}
nsrefcnt Release()
{
if (mRefCnt == PR_UINT32_MAX) {
NS_WARNING("refcount overflow, leaking nsSMILInstanceTime");
return mRefCnt;
}
NS_ABORT_IF_FALSE(_mOwningThread.GetThread() == PR_GetCurrentThread(),
"nsSMILInstanceTime release isn't thread-safe!");
--mRefCnt;
NS_LOG_RELEASE(this, mRefCnt, "nsSMILInstanceTime");
if (mRefCnt == 0) {
delete this;
return 0;
}
return mRefCnt;
}
protected:
void SetBaseInterval(nsSMILInterval* aBaseInterval);
void BreakPotentialCycle(const nsSMILInstanceTime* aNewTail) const;
const nsSMILInstanceTime* GetBaseTime() const;
nsSMILTimeValue mTime;
nsAutoRefCnt mRefCnt;
NS_DECL_OWNINGTHREAD
// Internal flags used for represent behaviour of different instance times`
enum {
// Indicates if this instance time should be removed when the owning timed
// element is reset. True for events and DOM calls.
kClearOnReset = 1,
// Indicates that this instance time is referred to by an
// nsSMILTimeValueSpec and as such may be updated. Such instance time should
// not be filtered out by the nsSMILTimedElement even if they appear to be
// in the past as they may be updated to a future time. Initially set for
// syncbase-generated times until they are frozen.
kMayUpdate = 2,
// Indicates that this instance time was generated from the DOM as opposed
// to an nsSMILTimeValueSpec. When a 'begin' or 'end' attribute is set or
// reset we should clear all the instance times that have been generated by
// that attribute (and hence an nsSMILTimeValueSpec), but not those from the
// DOM.
kFromDOM = 4
};
PRUint8 mFlags; // Combination of kClearOnReset, kMayUpdate, etc.
PRUint32 mSerial; // A serial number used by the containing class to
// specify the sort order for instance times with the
// same mTime.
PRPackedBool mVisited;
PRPackedBool mChainEnd;
nsSMILTimeValueSpec* mCreator; // The nsSMILTimeValueSpec object that created
// us. (currently only needed for syncbase
// instance times.)
nsSMILInterval* mBaseInterval; // Interval from which this time is derived
// (only used for syncbase instance times)
};
#endif // NS_SMILINSTANCETIME_H_