using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Diagnostics.CodeAnalysis;
namespace Aga.Controls
{
///
/// High resolution timer, used to test performance
///
public static class TimeCounter
{
private static Int64 _start;
///
/// Start time counting
///
public static void Start()
{
_start = 0;
QueryPerformanceCounter(ref _start);
}
public static Int64 GetStartValue()
{
Int64 t = 0;
QueryPerformanceCounter(ref t);
return t;
}
///
/// Finish time counting
///
/// time in seconds elapsed from Start till Finish
public static double Finish()
{
return Finish(_start);
}
public static double Finish(Int64 start)
{
Int64 finish = 0;
QueryPerformanceCounter(ref finish);
Int64 freq = 0;
QueryPerformanceFrequency(ref freq);
return (finish - start) / (double)freq;
}
[DllImport("Kernel32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool QueryPerformanceCounter(ref Int64 performanceCount);
[DllImport("Kernel32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool QueryPerformanceFrequency(ref Int64 frequency);
}
}