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260 lines
7.2 KiB
C++
260 lines
7.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Mozilla SMIL module.
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*
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* The Initial Developer of the Original Code is Brian Birtles.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Brian Birtles <birtles@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsSMILInstanceTime.h"
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#include "nsSMILInterval.h"
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#include "nsSMILTimeValueSpec.h"
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//----------------------------------------------------------------------
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// Helper classes
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namespace
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{
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// Utility class to set a PRPackedBool value to PR_TRUE whilst it is in scope.
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// Saves us having to remember to clear the flag at every possible return.
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class AutoBoolSetter
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{
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public:
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AutoBoolSetter(PRPackedBool& aValue)
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: mValue(aValue)
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{
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mValue = PR_TRUE;
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}
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~AutoBoolSetter()
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{
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mValue = PR_FALSE;
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}
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private:
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PRPackedBool& mValue;
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};
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}
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//----------------------------------------------------------------------
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// Implementation
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nsSMILInstanceTime::nsSMILInstanceTime(const nsSMILTimeValue& aTime,
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nsSMILInstanceTimeSource aSource,
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nsSMILTimeValueSpec* aCreator,
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nsSMILInterval* aBaseInterval)
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: mTime(aTime),
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mFlags(0),
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mVisited(PR_FALSE),
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mFixedEndpointRefCnt(0),
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mSerial(0),
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mCreator(aCreator),
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mBaseInterval(nsnull) // This will get set to aBaseInterval in a call to
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// SetBaseInterval() at end of constructor
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{
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switch (aSource) {
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case SOURCE_NONE:
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// No special flags
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break;
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case SOURCE_DOM:
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mFlags = kDynamic | kFromDOM;
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break;
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case SOURCE_SYNCBASE:
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mFlags = kMayUpdate;
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break;
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case SOURCE_EVENT:
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mFlags = kDynamic;
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break;
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}
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SetBaseInterval(aBaseInterval);
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}
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nsSMILInstanceTime::~nsSMILInstanceTime()
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{
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NS_ABORT_IF_FALSE(!mBaseInterval,
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"Destroying instance time without first calling Unlink()");
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NS_ABORT_IF_FALSE(mFixedEndpointRefCnt == 0,
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"Destroying instance time that is still used as the fixed endpoint of an "
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"interval");
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}
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void
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nsSMILInstanceTime::Unlink()
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{
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nsRefPtr<nsSMILInstanceTime> deathGrip(this);
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if (mBaseInterval) {
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mBaseInterval->RemoveDependentTime(*this);
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mBaseInterval = nsnull;
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}
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mCreator = nsnull;
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}
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void
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nsSMILInstanceTime::HandleChangedInterval(
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const nsSMILTimeContainer* aSrcContainer,
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PRBool aBeginObjectChanged,
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PRBool aEndObjectChanged)
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{
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NS_ABORT_IF_FALSE(mBaseInterval,
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"Got call to HandleChangedInterval on an independent instance time.");
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NS_ABORT_IF_FALSE(mCreator, "Base interval is set but creator is not.");
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if (mVisited) {
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// Break the cycle here
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Unlink();
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return;
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}
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PRBool objectChanged = mCreator->DependsOnBegin() ? aBeginObjectChanged :
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aEndObjectChanged;
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AutoBoolSetter setVisited(mVisited);
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nsRefPtr<nsSMILInstanceTime> deathGrip(this);
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mCreator->HandleChangedInstanceTime(*GetBaseTime(), aSrcContainer, *this,
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objectChanged);
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}
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void
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nsSMILInstanceTime::HandleDeletedInterval()
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{
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NS_ABORT_IF_FALSE(mBaseInterval,
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"Got call to HandleDeletedInterval on an independent instance time");
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NS_ABORT_IF_FALSE(mCreator, "Base interval is set but creator is not");
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mBaseInterval = nsnull;
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mFlags &= ~kMayUpdate; // Can't update without a base interval
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nsRefPtr<nsSMILInstanceTime> deathGrip(this);
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mCreator->HandleDeletedInstanceTime(*this);
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mCreator = nsnull;
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}
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void
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nsSMILInstanceTime::HandleFilteredInterval()
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{
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NS_ABORT_IF_FALSE(mBaseInterval,
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"Got call to HandleFilteredInterval on an independent instance time");
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mBaseInterval = nsnull;
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mFlags &= ~kMayUpdate; // Can't update without a base interval
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mCreator = nsnull;
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}
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PRBool
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nsSMILInstanceTime::ShouldPreserve() const
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{
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return mFixedEndpointRefCnt > 0 || (mFlags & kWasDynamicEndpoint);
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}
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void
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nsSMILInstanceTime::UnmarkShouldPreserve()
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{
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mFlags &= ~kWasDynamicEndpoint;
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}
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void
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nsSMILInstanceTime::AddRefFixedEndpoint()
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{
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NS_ABORT_IF_FALSE(mFixedEndpointRefCnt < PR_UINT16_MAX,
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"Fixed endpoint reference count upper limit reached");
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++mFixedEndpointRefCnt;
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mFlags &= ~kMayUpdate; // Once fixed, always fixed
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}
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void
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nsSMILInstanceTime::ReleaseFixedEndpoint()
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{
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NS_ABORT_IF_FALSE(mFixedEndpointRefCnt > 0, "Duplicate release");
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--mFixedEndpointRefCnt;
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if (mFixedEndpointRefCnt == 0 && IsDynamic()) {
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mFlags |= kWasDynamicEndpoint;
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}
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}
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PRBool
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nsSMILInstanceTime::IsDependentOn(const nsSMILInstanceTime& aOther) const
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{
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if (mVisited)
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return PR_FALSE;
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const nsSMILInstanceTime* myBaseTime = GetBaseTime();
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if (!myBaseTime)
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return PR_FALSE;
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if (myBaseTime == &aOther)
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return PR_TRUE;
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// mVisited is mutable
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AutoBoolSetter setVisited(const_cast<nsSMILInstanceTime*>(this)->mVisited);
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return myBaseTime->IsDependentOn(aOther);
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}
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void
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nsSMILInstanceTime::SetBaseInterval(nsSMILInterval* aBaseInterval)
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{
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NS_ABORT_IF_FALSE(!mBaseInterval,
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"Attempting to reassociate an instance time with a different interval.");
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if (aBaseInterval) {
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NS_ABORT_IF_FALSE(mCreator,
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"Attempting to create a dependent instance time without reference "
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"to the creating nsSMILTimeValueSpec object.");
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if (!mCreator)
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return;
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aBaseInterval->AddDependentTime(*this);
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}
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mBaseInterval = aBaseInterval;
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}
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const nsSMILInstanceTime*
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nsSMILInstanceTime::GetBaseTime() const
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{
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if (!mBaseInterval) {
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return nsnull;
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}
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NS_ABORT_IF_FALSE(mCreator, "Base interval is set but there is no creator.");
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if (!mCreator) {
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return nsnull;
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}
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return mCreator->DependsOnBegin() ? mBaseInterval->Begin() :
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mBaseInterval->End();
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}
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