From Forum Nokia Wiki

在游戏开发中图片的绘制速度尤为重要，但是Symbian OS窗口框架并未为游戏提供全面的支持，我们需要直接访问屏幕缓存以便提供流畅的动画效果

需要的链接库:

LIBRARY  ws32.lib //RWsSession, CWsScreenDevice, RWindowGroup, CDirectScreenAccess
LIBRARY  bitgdi.lib  //CFbsBitGc

Display.h

#include <w32std.h> //RWsSession, CWsScreenDevice, RWindowGroup, CDirectScreenAccess
#include <bitstd.h>  //CFbsBitGc
 
 
class CDisplay : public MDirectScreenAccess
{
public:
	static CDisplay*NewL( RWsSession& pClient, CWsScreenDevice& pScreenDevice, RWindow& pWindow );
	static CDisplay*NewLC( RWsSession& pClient, CWsScreenDevice& pScreenDevice, RWindow& pWindow );
	~CDisplay();
 
	inline CWsScreenDevice& GetScreenDevice()
	{
		return m_pScreenDevice;
	}
 
	inline RWindow& GetWindow()
	{
		return m_pWindow;
	}
 
	inline CFbsBitGc* GetScreenGc()
	{
		return m_pGc;
	}
 
	void Start();
	void Stop();
	void Update();
 
private:
	CDisplay( RWsSession& pClient, CWsScreenDevice& pScreenDevice, RWindow& pWindow );
	void ConstructL();
	void Restart( RDirectScreenAccess::TTerminationReasons aReason );
	void AbortNow( RDirectScreenAccess::TTerminationReasons aReason );
 
private:
	CWsScreenDevice&	m_pScreenDevice;
	RWsSession&		m_pClient;
	RWindow&		m_pWindow;
 
	CDirectScreenAccess*	m_pDirectScreenAccess;
	RRegion*		m_pRegion;
	CFbsBitGc*		m_pGc;
 
	TBool			m_bDrawing;
};

Display.cpp

#include "Display.h"
 
 
CDisplay* CDisplay::NewL( RWsSession& pClient, CWsScreenDevice& pScreenDevice, RWindow& pWindow )
{
	CDisplay* self = NewLC( pClient, pScreenDevice, pWindow );
	CleanupStack::Pop( self );
	return self;
}
 
CDisplay* CDisplay::NewLC( RWsSession& pClient, CWsScreenDevice& pScreenDevice, RWindow& pWindow )
{
	CDisplay* self = new ( ELeave ) CDisplay( pClient, pScreenDevice, pWindow );
	CleanupStack::PushL( self );
	self->ConstructL();
	return self;
}
 
CDisplay::CDisplay( RWsSession& pClient, CWsScreenDevice& pScreenDevice, RWindow& pWindow ) :
m_pClient( pClient ),
m_pScreenDevice( pScreenDevice ),
m_pWindow( pWindow )
{
	m_pDirectScreenAccess = NULL;
	m_pRegion = NULL;
	m_pGc = NULL;
 
	m_bDrawing = EFalse;
}
 
CDisplay::~CDisplay()
{
	delete m_pDirectScreenAccess;
}
 
void CDisplay::ConstructL()
{
	m_pDirectScreenAccess = CDirectScreenAccess::NewL( m_pClient, m_pScreenDevice, m_pWindow, *this );
}
 
void CDisplay::Start()
{
	if( !m_bDrawing )
	{
		TRAPD( dsaErr, m_pDirectScreenAccess->StartL() );
		if( dsaErr == KErrNone )
		{
			m_pGc = m_pDirectScreenAccess->Gc();
			m_pRegion = m_pDirectScreenAccess->DrawingRegion();
			m_pGc->SetClippingRegion( m_pRegion );
			m_bDrawing = ETrue;
		}
	}
}
 
void CDisplay::Stop()
{
	if( m_bDrawing )
	{
		m_bDrawing = EFalse;
	}
}
 
void CDisplay::Update()
{
	m_pDirectScreenAccess->ScreenDevice()->Update();
}
 
void CDisplay::Restart( RDirectScreenAccess::TTerminationReasons /*aReason*/ )
{
	Start();
}
 
void CDisplay::AbortNow( RDirectScreenAccess::TTerminationReasons /*aReason*/ )
{
	m_pDirectScreenAccess->Cancel();
	m_bDrawing = EFalse;
}