cfpscounter.cpp

来自「手机开发3D应用平台,开发平台是诺基亚的carbird,这是一个很有用的东西,希」· C++ 代码 · 共 51 行

// INCLUDES
#include "CFpsCounter.h"
#include <hal.h>

// MEMBER FUNCTIONS
CFpsCounter* CFpsCounter::NewL( TInt aInterval )
	{
	CFpsCounter* self = new( ELeave )CFpsCounter( aInterval );
	return self;
	}

CFpsCounter::CFpsCounter( TInt aInterval )
	{
	HAL::Get( HALData::ESystemTickPeriod, iTicksPerSecond );
	iTicksPerSecond = 1000000 / iTicksPerSecond;
	SetInterval( aInterval );
	iFrames = 0;
	iSeconds=0;
	iStartTicks = User::TickCount();
	}
	
CFpsCounter::~CFpsCounter()
	{
	}
	
int CFpsCounter::Fps()
	{
	return iFps;
	}

void CFpsCounter::SetInterval( TInt aInterval )
	{
	iSecs = aInterval;
	iInterval = ( iTicksPerSecond * aInterval );
	}

void CFpsCounter::Update()
	{
	TInt cticks = User::TickCount();
	iFrames++;
	
	if ( ( cticks - iStartTicks ) > iInterval )
		{
		TInt dif = cticks - iStartTicks;
		iFps = ( ( iFrames * ( iTicksPerSecond ) ) / dif );
		iFrames = 0;
		iSeconds += iSecs;
		iStartTicks = User::TickCount();
		}
	}