The GtkRadiant sources as originally released under the GPL license.

radiant/timer.h

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+/*
+Copyright (C) 2001-2006, William Joseph.
+All Rights Reserved.
+
+This file is part of GtkRadiant.
+
+GtkRadiant is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+GtkRadiant is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#if !defined (INCLUDED_TIMER_H)
+#define INCLUDED_TIMER_H
+
+#if 1
+
+const int msec_per_sec = 1000;
+
+class MillisecondTime
+{
+  unsigned int m_milliseconds;
+public:
+  MillisecondTime(unsigned int milliseconds)
+    : m_milliseconds(milliseconds)
+  {
+  }
+  MillisecondTime()
+  {
+  }
+  static MillisecondTime current();
+
+  unsigned int milliseconds_since(const MillisecondTime& other) const
+  {
+    return m_milliseconds - other.m_milliseconds;
+  }
+};
+
+template<typename tick_type>
+inline MillisecondTime time_from_ticks(tick_type tick_count, tick_type ticks_per_sec)
+{
+  return MillisecondTime(static_cast<unsigned int>(tick_count / static_cast<double>(ticks_per_sec / msec_per_sec)));
+}
+
+#else
+
+const unsigned int usec_per_sec = 1000000;
+
+class MillisecondTime
+{
+  unsigned int m_sec;
+  unsigned int m_usec;
+public:
+  MillisecondTime(unsigned int sec, unsigned int usec)
+    : m_sec(sec), m_usec(usec)
+  {
+  }
+  MillisecondTime()
+  {
+  }
+  staticMillisecondTime current();
+
+  unsigned int milliseconds_since(const MillisecondTime& other) const
+  {
+    return static_cast<unsigned int>((m_sec * static_cast<double>(usec_per_sec) + m_usec)
+      - (other.m_sec * static_cast<double>(usec_per_sec) + other.m_usec)) / 1000;
+  }
+};
+
+template<typename tick_type>
+inline MillisecondTime time_from_ticks(tick_type tick_count, tick_type ticks_per_sec)
+{
+  return MillisecondTime(static_cast<unsigned int>(tick_count / ticks_per_sec),
+    static_cast<unsigned int>((tick_count % ticks_per_sec) * (usec_per_sec / static_cast<double>(ticks_per_sec))));
+}
+
+#endif
+
+class Timer
+{
+  MillisecondTime m_start;
+
+public:
+  void start()
+  {
+    m_start = MillisecondTime::current();
+  }
+  unsigned int elapsed_msec()
+  {
+    return MillisecondTime::current().milliseconds_since(m_start);
+  }
+};
+
+#endif