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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
*/
#include <sal/config.h>
#include <algorithm>
#include <tools/diagnose_ex.h>
#include "activitybase.hxx"
namespace slideshow::internal
{
// TODO(P1): Elide some virtual function calls, by templifying this
// static hierarchy
ActivityBase::ActivityBase( const ActivityParameters& rParms ) :
mpEndEvent( rParms.mrEndEvent ),
mrEventQueue( rParms.mrEventQueue ),
mpShape(),
mpAttributeLayer(),
maRepeats( rParms.mrRepeats ),
mnAccelerationFraction( rParms.mnAccelerationFraction ),
mnDecelerationFraction( rParms.mnDecelerationFraction ),
mbAutoReverse( rParms.mbAutoReverse ),
mbFirstPerformCall( true ),
mbIsActive( true ) {}
void ActivityBase::dispose()
{
// deactivate
mbIsActive = false;
// dispose event
if( mpEndEvent )
mpEndEvent->dispose();
// release references
mpEndEvent.reset();
mpShape.reset();
mpAttributeLayer.reset();
}
double ActivityBase::calcTimeLag() const
{
// TODO(Q1): implement different init process!
if (isActive() && mbFirstPerformCall)
{
mbFirstPerformCall = false;
// notify derived classes that we're
// starting now
const_cast<ActivityBase *>(this)->startAnimation();
}
return 0.0;
}
bool ActivityBase::perform()
{
// still active?
if( !isActive() )
return false; // no, early exit.
OSL_ASSERT( ! mbFirstPerformCall );
return true;
}
bool ActivityBase::isActive() const
{
return mbIsActive;
}
void ActivityBase::setTargets( const AnimatableShapeSharedPtr& rShape,
const ShapeAttributeLayerSharedPtr& rAttrLayer )
{
ENSURE_OR_THROW( rShape,
"ActivityBase::setTargets(): Invalid shape" );
ENSURE_OR_THROW( rAttrLayer,
"ActivityBase::setTargets(): Invalid attribute layer" );
mpShape = rShape;
mpAttributeLayer = rAttrLayer;
}
void ActivityBase::endActivity()
{
// this is a regular activity end
mbIsActive = false;
// Activity is ending, queue event, then
if( mpEndEvent )
mrEventQueue.addEvent( mpEndEvent );
// release references
mpEndEvent.reset();
}
void ActivityBase::dequeued()
{
// xxx todo:
// // ignored here, if we're still active. Discrete
// // activities are dequeued after every perform() call,
// // thus, the call is only significant when isActive() ==
// // false.
if( !isActive() )
endAnimation();
}
void ActivityBase::end()
{
if (!isActive() || isDisposed())
return;
// assure animation is started:
if (mbFirstPerformCall) {
mbFirstPerformCall = false;
// notify derived classes that we're starting now
startAnimation();
}
performEnd(); // calling private virtual
endAnimation();
endActivity();
}
double ActivityBase::calcAcceleratedTime( double nT ) const
{
// Handle acceleration/deceleration
// ================================
// clamp nT to permissible [0,1] range
nT = std::clamp( nT, 0.0, 1.0 );
// take acceleration/deceleration into account. if the sum
// of mnAccelerationFraction and mnDecelerationFraction
// exceeds 1.0, ignore both (that's according to SMIL spec)
if( (mnAccelerationFraction > 0.0 ||
mnDecelerationFraction > 0.0) &&
mnAccelerationFraction + mnDecelerationFraction <= 1.0 )
{
/*
// calc accelerated/decelerated time.
// We have three intervals:
// 1 [0,a]
// 2 [a,d]
// 3 [d,1] (with a and d being acceleration/deceleration
// fraction, resp.)
// The change rate during interval 1 is constantly
// increasing, reaching 1 at a. It then stays at 1,
// starting a linear decrease at d, ending with 0 at
// time 1. The integral of this function is the
// required new time nT'.
// As we arbitrarily assumed 1 as the upper value of
// the change rate, the integral must be normalized to
// reach nT'=1 at the end of the interval. This
// normalization constant is:
// c = 1 - 0.5a - 0.5d
// The integral itself then amounts to:
// 0.5 nT^2 / a + (nT-a) + (nT - 0.5 nT^2 / d)
// (where each of the three summands correspond to the
// three intervals above, and are applied only if nT
// has reached the corresponding interval)
// The graph of the change rate is a trapezoid:
// |
// 1| /--------------\
// | / \
// | / \
// | / \
// -----------------------------
// 0 a d 1
//*/
const double nC( 1.0 - 0.5*mnAccelerationFraction - 0.5*mnDecelerationFraction );
// this variable accumulates the new time value
double nTPrime(0.0);
if( nT < mnAccelerationFraction )
{
nTPrime += 0.5*nT*nT/mnAccelerationFraction; // partial first interval
}
else
{
nTPrime += 0.5*mnAccelerationFraction; // full first interval
if( nT <= 1.0-mnDecelerationFraction )
{
nTPrime += nT-mnAccelerationFraction; // partial second interval
}
else
{
nTPrime += 1.0 - mnAccelerationFraction - mnDecelerationFraction; // full second interval
const double nTRelative( nT - 1.0 + mnDecelerationFraction );
nTPrime += nTRelative - 0.5*nTRelative*nTRelative / mnDecelerationFraction;
}
}
// normalize, and assign to work variable
nT = nTPrime / nC;
}
return nT;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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