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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 <canvas/elapsedtime.hxx>
#include <tools/time.hxx>
namespace canvas::tools {
double ElapsedTime::getSystemTime()
{
return ::tools::Time::GetMonotonicTicks() / 1.0E6;
}
ElapsedTime::ElapsedTime()
: m_pTimeBase(),
m_fLastQueriedTime( 0.0 ),
m_fStartTime( getSystemTime() ),
m_fFrozenTime( 0.0 ),
m_bInPauseMode( false ),
m_bInHoldMode( false )
{
}
ElapsedTime::ElapsedTime(
std::shared_ptr<ElapsedTime> const & pTimeBase )
: m_pTimeBase( pTimeBase ),
m_fLastQueriedTime( 0.0 ),
m_fStartTime( getCurrentTime() ),
m_fFrozenTime( 0.0 ),
m_bInPauseMode( false ),
m_bInHoldMode( false )
{
}
void ElapsedTime::reset()
{
m_fLastQueriedTime = 0.0;
m_fStartTime = getCurrentTime();
m_fFrozenTime = 0.0;
m_bInPauseMode = false;
m_bInHoldMode = false;
}
void ElapsedTime::adjustTimer( double fOffset )
{
// to make getElapsedTime() become _larger_, have to reduce
// m_fStartTime.
m_fStartTime -= fOffset;
// also adjust frozen time, this method must _always_ affect the
// value returned by getElapsedTime()!
if (m_bInHoldMode || m_bInPauseMode)
m_fFrozenTime += fOffset;
}
double ElapsedTime::getCurrentTime() const
{
return m_pTimeBase == nullptr ? getSystemTime() : m_pTimeBase->getElapsedTimeImpl();
}
double ElapsedTime::getElapsedTime() const
{
m_fLastQueriedTime = getElapsedTimeImpl();
return m_fLastQueriedTime;
}
double ElapsedTime::getElapsedTimeImpl() const
{
if (m_bInHoldMode || m_bInPauseMode)
return m_fFrozenTime;
return getCurrentTime() - m_fStartTime;
}
void ElapsedTime::pauseTimer()
{
m_fFrozenTime = getElapsedTimeImpl();
m_bInPauseMode = true;
}
void ElapsedTime::continueTimer()
{
m_bInPauseMode = false;
// stop pausing, time runs again. Note that
// getElapsedTimeImpl() honors hold mode, i.e. a
// continueTimer() in hold mode will preserve the latter
const double fPauseDuration( getElapsedTimeImpl() - m_fFrozenTime );
// adjust start time, such that subsequent getElapsedTime() calls
// will virtually start from m_fFrozenTime.
m_fStartTime += fPauseDuration;
}
void ElapsedTime::holdTimer()
{
// when called during hold mode (e.g. more than once per time
// object), the original hold time will be maintained.
m_fFrozenTime = getElapsedTimeImpl();
m_bInHoldMode = true;
}
void ElapsedTime::releaseTimer()
{
m_bInHoldMode = false;
}
} // namespace canvas
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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