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| -rw-r--r-- | slideshow/source/engine/activities/activitybase.cxx | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/slideshow/source/engine/activities/activitybase.cxx b/slideshow/source/engine/activities/activitybase.cxx new file mode 100644 index 000000000..82a117f8a --- /dev/null +++ b/slideshow/source/engine/activities/activitybase.cxx @@ -0,0 +1,234 @@ +/* -*- 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: */ |