1 files changed, 130 insertions, 0 deletions
diff --git a/canvas/source/tools/elapsedtime.cxx b/canvas/source/tools/elapsedtime.cxx
new file mode 100644
index 0000000000..46167dd9a8
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+++ b/canvas/source/tools/elapsedtime.cxx
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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>
+#include <utility>
+
+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> pTimeBase )
+    : m_pTimeBase(std::move( 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
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */