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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 <tools/diagnose_ex.h>
+
+#include "discreteactivitybase.hxx"
+
+
+namespace slideshow::internal
+{
+ DiscreteActivityBase::DiscreteActivityBase( const ActivityParameters& rParms ) :
+ ActivityBase( rParms ),
+ mpWakeupEvent( rParms.mpWakeupEvent ),
+ maDiscreteTimes( rParms.maDiscreteTimes ),
+ mnSimpleDuration( rParms.mnMinDuration ),
+ mnCurrPerformCalls( 0 )
+ {
+ ENSURE_OR_THROW( mpWakeupEvent,
+ "DiscreteActivityBase::DiscreteActivityBase(): Invalid wakeup event" );
+
+ ENSURE_OR_THROW( !maDiscreteTimes.empty(),
+ "DiscreteActivityBase::DiscreteActivityBase(): time vector is empty, why do you create me?" );
+
+#ifdef DBG_UTIL
+ // check parameters: rDiscreteTimes must be sorted in
+ // ascending order, and contain values only from the range
+ // [0,1]
+ for( ::std::size_t i=1, len=maDiscreteTimes.size(); i<len; ++i )
+ {
+ if( maDiscreteTimes[i] < 0.0 ||
+ maDiscreteTimes[i] > 1.0 ||
+ maDiscreteTimes[i-1] < 0.0 ||
+ maDiscreteTimes[i-1] > 1.0 )
+ {
+ ENSURE_OR_THROW( false, "DiscreteActivityBase::DiscreteActivityBase(): time values not within [0,1] range!" );
+ }
+
+ if( maDiscreteTimes[i-1] > maDiscreteTimes[i] )
+ ENSURE_OR_THROW( false, "DiscreteActivityBase::DiscreteActivityBase(): time vector is not sorted in ascending order!" );
+ }
+
+ // TODO(E2): check this also in production code?
+#endif
+ }
+
+ void DiscreteActivityBase::startAnimation()
+ {
+ // start timer on wakeup event
+ mpWakeupEvent->start();
+ }
+
+ sal_uInt32 DiscreteActivityBase::calcFrameIndex( sal_uInt32 nCurrCalls,
+ ::std::size_t nVectorSize ) const
+ {
+ if( isAutoReverse() )
+ {
+ // every full repeat run consists of one
+ // forward and one backward traversal.
+ sal_uInt32 nFrameIndex( nCurrCalls % (2*nVectorSize) );
+
+ // nFrameIndex values >= nVectorSize belong to
+ // the backward traversal
+ if( nFrameIndex >= nVectorSize )
+ nFrameIndex = 2*nVectorSize - nFrameIndex; // invert sweep
+
+ return nFrameIndex;
+ }
+ else
+ {
+ return nCurrCalls % nVectorSize ;
+ }
+ }
+
+ sal_uInt32 DiscreteActivityBase::calcRepeatCount( sal_uInt32 nCurrCalls,
+ ::std::size_t nVectorSize ) const
+ {
+ if( isAutoReverse() )
+ return nCurrCalls / (2*nVectorSize); // we've got 2 cycles per repeat
+ else
+ return nCurrCalls / nVectorSize;
+ }
+
+ bool DiscreteActivityBase::perform()
+ {
+ // call base class, for start() calls and end handling
+ if( !ActivityBase::perform() )
+ return false; // done, we're ended
+
+ const ::std::size_t nVectorSize( maDiscreteTimes.size() );
+
+ // actually perform something
+ // ==========================
+
+ // TODO(Q3): Refactor this mess
+
+ // call derived class with current frame index (modulo
+ // vector size, to cope with repeats)
+ perform( calcFrameIndex( mnCurrPerformCalls, nVectorSize ),
+ calcRepeatCount( mnCurrPerformCalls, nVectorSize ) );
+
+ // calc next index
+ ++mnCurrPerformCalls;
+
+ // calc currently reached repeat count
+ double nCurrRepeat( double(mnCurrPerformCalls) / nVectorSize );
+
+ // if auto-reverse is specified, halve the
+ // effective repeat count, since we pass every
+ // repeat run twice: once forward, once backward.
+ if( isAutoReverse() )
+ nCurrRepeat /= 2.0;
+
+ // schedule next frame, if either repeat is indefinite
+ // (repeat forever), or we've not yet reached the requested
+ // repeat count
+ if( !isRepeatCountValid() ||
+ nCurrRepeat < getRepeatCount() )
+ {
+ // add wake-up event to queue (modulo
+ // vector size, to cope with repeats).
+
+ // repeat is handled locally, only apply acceleration/deceleration.
+ // Scale time vector with simple duration, offset with full repeat
+ // times.
+
+ // Somewhat condensed, the argument for setNextTimeout below could
+ // be written as
+
+ // mnSimpleDuration*(nFullRepeats + calcAcceleratedTime( currentRepeatTime )),
+
+ // with currentRepeatTime = maDiscreteTimes[ currentRepeatIndex ]
+
+ // Note that calcAcceleratedTime() is only applied to the current repeat's value,
+ // not to the total resulting time. This is in accordance with the SMIL spec.
+
+ mpWakeupEvent->setNextTimeout(
+ mnSimpleDuration*(
+ calcRepeatCount(
+ mnCurrPerformCalls,
+ nVectorSize ) +
+ calcAcceleratedTime(
+ maDiscreteTimes[
+ calcFrameIndex(
+ mnCurrPerformCalls,
+ nVectorSize ) ] ) ) );
+
+ getEventQueue().addEvent( mpWakeupEvent );
+ }
+ else
+ {
+ // release event reference (relation to wakeup event
+ // is circular!)
+ mpWakeupEvent.reset();
+
+ // done with this activity
+ endActivity();
+ }
+
+ return false; // remove from queue, will be added back by the wakeup event.
+ }
+
+ void DiscreteActivityBase::dispose()
+ {
+ // dispose event
+ if( mpWakeupEvent )
+ mpWakeupEvent->dispose();
+
+ // release references
+ mpWakeupEvent.reset();
+
+ ActivityBase::dispose();
+ }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */