add vcglib

vcglib/wrap/system/time/clock.h

@@ -0,0 +1,149 @@
+//*******************************************************************
+// Clock.h -- Header for Clock.cpp
+// Copyright (c) 2011 Jose Maria Noguera
+// Dec 9, 2011
+//
+// Jose Maria Noguera Rozua http://wwwdi.ujaen.es/~jnoguera/
+//
+//*******************************************************************
+
+#ifndef _CHRONOMETER_H_
+#define _CHRONOMETER_H_
+
+#ifdef QT_CORE_LIB
+
+#include <QTime>
+
+namespace mt{
+  typedef QTime Clock;
+}//namespace
+
+#else
+
+#ifdef _WIN32 
+	#include <windows.h>
+#else
+	#include <sys/time.h>
+#endif
+
+namespace mt{
+
+/** @brief Clock used to measure performance of algoritms.
+Behaves similarly to QTime (QT).*/
+
+class Clock{
+
+public:
+  /** Initializes the Clock */
+  Clock()
+  {
+  #ifdef _WIN32
+    QueryPerformanceFrequency(&freq);
+  #endif
+  }
+
+  /** Returns the current time as reported by the system clock. */
+  static Clock currentTime()
+  {
+    Clock c;
+    c.start();
+    return c;
+  }
+
+  /** Sets this time to the current time. This is practical for timing. */
+  inline void start()
+  {
+  #ifdef _WIN32
+    QueryPerformanceCounter(&tini);
+  #else
+    gettimeofday (&tini, 0);
+  #endif
+  }
+
+  /** Sets this time to the current time and returns the number of
+  milliseconds that have elapsed since the last time start()
+  or restart() was called.*/
+  inline int restart()
+  {
+    return elapsedAux(true);
+  }
+
+  /** Returns the number of milliseconds that have elapsed since the
+  last time start() or restart() was called. */
+  inline int elapsed()
+  {
+    return elapsedAux(false);
+  }
+
+
+  /* Returns the number of milliseconds from this time to t. If t is earlier
+  than this time, the number of milliseconds returned is negative.*/
+  int msecsTo ( const Clock & t ) const
+  {
+  #ifdef _WIN32
+    LARGE_INTEGER tacum;
+    tacum.QuadPart = (t.tini.QuadPart - this->tini.QuadPart);
+    return (int) tacum.QuadPart / ((int)freq.QuadPart / 1000);
+  #else
+    long int sec = t.tini.tv_sec - this->tini.tv_sec;
+    long int usec = t.tini.tv_usec - this->tini.tv_usec;
+    if (usec < 0) {
+      sec --;
+      usec += 1000000u;
+    }
+    return (int) sec * 1000.0f + (int) usec / 1000.0f;
+  #endif
+  }
+
+protected:
+
+#ifdef _WIN32
+  /* Initial time */
+  LARGE_INTEGER tini;
+  /* Frequency */
+  LARGE_INTEGER freq;
+#else
+  /** Initial time */
+  timeval tini;
+#endif
+
+  /** Returns the number of milliseconds that have elapsed since the
+  last time start() or restart() was called. 
+  If restart is true, it also sets this time to the current time.*/
+  int elapsedAux( bool restart )
+  {
+  #ifdef _WIN32
+    LARGE_INTEGER tnow;
+    LARGE_INTEGER tacum;
+
+    QueryPerformanceCounter(&tnow);
+    tacum.QuadPart = (tnow.QuadPart - tini.QuadPart);
+
+    if(restart)
+      tini.QuadPart = tnow.QuadPart;
+
+    return (int) tacum.QuadPart / ((int)freq.QuadPart / 1000);
+
+  #else
+    timeval tnow;
+    gettimeofday (&tnow, 0);
+
+    long int sec = tnow.tv_sec - tini.tv_sec;
+    long int usec = tnow.tv_usec - tini.tv_usec;
+    if (usec < 0) {
+      sec --;
+      usec += 1000000u;
+    }
+    if(restart)
+      tini = tnow;
+
+    return (int) sec * 1000.0f + (int) usec / 1000.0f;
+
+  #endif
+  }
+};
+
+}//namespace
+
+#endif //ifdef QT_CORE_LIB
+#endif //ifndef _CHRONOMETER_H_