samplecontainer.cpp

稿件名称：基于Symbian OS的S60手机游戏图像处理 稿件作者：王庚 程序名称：Sample 运行环境：Win XP；VC++ 6.0

/*
* ============================================================================
*  Name     : CSampleContainer from SampleContainer.h
*  Part of  : Sample
*  Created  : 2005-09-27 by 
*  Implementation notes:
*     Initial content was generated by Series 60 AppWizard.
*  Version  :
*  Copyright: 
* ============================================================================
*/

// INCLUDE FILES
#include "SampleContainer.h"
#include "sampleappui.h"

#include <eiklabel.h>  // for example label control
_LIT (KMultiBitmapFilename,"c:\\System\\Apps\\sample\\images.mbm");

// ================= MEMBER FUNCTIONS =======================

// ---------------------------------------------------------
// CSampleContainer::ConstructL(const TRect& aRect)
// EPOC two phased constructor
// ---------------------------------------------------------
//
void CSampleContainer::ConstructL(const TRect& aRect)
    {

	m_bAbort = EFalse;
	m_bGainingForeground = EFalse;

	m_iBallPos.iX = 0;
	m_iBallPos.iY = 30;
	m_iXVelocity  = 5;

    CreateWindowL();

    SetRect(aRect);
    ActivateL();

	iCoeEnv->AddForegroundObserverL(*this);
	m_pDSA = CDirectScreenAccess::NewL(	iCoeEnv->WsSession(), 
		*iCoeEnv->ScreenDevice(), 
		Window(), 
		*this);

	m_pPeriodic = CPeriodic::NewL(EPriorityMuchLess);
		
	//初始化图形设备接口
	InitGDI();
	//加载位图
	m_pBitmap_Background = CreateBitmapLC(KMultiBitmapFilename,EMbmImagesImage1);
	m_pBitmap_Ball = CreateBitmapLC(KMultiBitmapFilename,EMbmImagesImage2);
	m_pBitmap_Ball_Mask = CreateBitmapLC(KMultiBitmapFilename,EMbmImagesImage2_mask);
	


}
void CSampleContainer::InitGDI()
{
	//创建位图
	m_pBackSurface = new (ELeave)CFbsBitmap();
	//设置该位图宽高和显示模式(EColor4k:4096色)
	User::LeaveIfError(m_pBackSurface->Create(TSize(SCREEN_WIDTH, SCREEN_HEIGHT), EColor4K));
	//用该位图创建TBitmapUtil实例
	m_pBmpUtil = new (ELeave) TBitmapUtil(m_pBackSurface);
	//基于该位图创建位图设备
	m_pBackDevice = CFbsBitmapDevice::NewL(m_pBackSurface);
	//基于该设备创建位图图形场景
	User::LeaveIfError(m_pBackDevice->CreateContext(m_pBackGc));
	m_pBackGc->SetBrushStyle(CGraphicsContext::ESolidBrush) ;
	
	ResetBackSurfDataPtr();
}
CFbsBitmap* CSampleContainer::CreateBitmapLC(const TDesC& aFileName,TInt aId)
{
	CFbsBitmap* bitmap = new(ELeave) CFbsBitmap();
	
	CleanupStack::PushL(bitmap);
	TInt loadException = bitmap->Load(aFileName,aId);
	User::LeaveIfError(loadException);
	CleanupStack::Pop();
	return bitmap;
}
TInt CSampleContainer::PeriodicCallBack(TAny *pAny)
{
	((CSampleContainer*)pAny)->GameCycle();
	return 0;
}
void CSampleContainer::AbortNow(RDirectScreenAccess::TTerminationReasons /*aReason*/)
{
	if (m_pDSA)
	{
		AbortNowImpl();
		m_pDSA->Cancel();
	}
}
void CSampleContainer::Restart(RDirectScreenAccess::TTerminationReasons /*aReason*/)
{
	if (m_bGainingForeground)
	{
		if (m_pDSA && !m_pDSA->IsActive())
		{
			StartL();
		}
	}
}

void CSampleContainer::StartL()
{
	TRAPD(dsaError, m_pDSA->StartL());
	if (dsaError == KErrNone)
	{
		m_pGc = m_pDSA->Gc(); // Get graphics context for drawing
		m_pGc->SetClippingRegion(m_pDSA->DrawingRegion()); // Set the clipping to this region
		RestartImpl();
	}
}
void CSampleContainer::HandleGainingForeground()
{
	m_bGainingForeground = ETrue;
	if (m_pDSA && !m_pDSA->IsActive())
	{
		StartL();
	}
}
void CSampleContainer::HandleLosingForeground()
{
	m_bGainingForeground = EFalse;
}

void CSampleContainer::RestartImpl()
{
	ResetBackSurfDataPtr();
	m_bAbort = EFalse;
	m_pPeriodic->Start(0, 1000000 / 60, TCallBack(PeriodicCallBack,(TAny*)this));	// 12帧
}

void CSampleContainer::AbortNowImpl()
{
	m_bAbort = ETrue;
	m_pPeriodic->Cancel();
}
void CSampleContainer::GameCycle()
{
	//利用数据内存指针填充脱屏位图为黑色即刷新屏幕
	Mem::FillZ((TAny*)m_pBackSurfaceData,SCREEN_WIDTH*SCREEN_HEIGHT*sizeof(TUint16));
	//更新数据
	Update();
	//将脱屏位图绘制到屏幕		
	DrawNow();
}
void CSampleContainer::ResetBackSurfDataPtr()
{
	//锁定位图堆
	m_pBmpUtil->Begin(TPoint(0, 0));
	//获得脱屏位图内存数据地址
	m_pBackSurfaceData = (TUint16*)m_pBackSurface->DataAddress();
	//释放堆
	m_pBmpUtil->End();
	
}
void CSampleContainer::Update()
{
	int  iNewXPos = m_iBallPos.iX + m_iXVelocity;

	if (iNewXPos < 0 ||
		iNewXPos + m_pBitmap_Ball->SizeInPixels().iWidth > 176)
	{
		m_iXVelocity = - m_iXVelocity;
		return;
	}

	m_iBallPos.iX = m_iBallPos.iX + m_iXVelocity;
}
// ---------------------------------------------------------
// CSampleContainer::Draw(const TRect& aRect) const
// ---------------------------------------------------------
//
void CSampleContainer::PartialReset(CFbsBitGc& aGc) const
{
	aGc.SetPenSize(TSize(1,1));
	aGc.SetPenColor(KRgbBlack);
	aGc.SetPenStyle(CFbsBitGc::ESolidPen);
	aGc.SetDrawMode(CFbsBitGc::EDrawModePEN);
	aGc.DiscardFont();
	aGc.DiscardBrushPattern();
	aGc.SetBrushColor(KRgbWhite);
	aGc.SetBrushStyle(CFbsBitGc::ENullBrush);
	aGc.SetCharJustification(0,0);
	aGc.SetWordJustification(0,0);
	aGc.SetDitherOrigin(TPoint(0,0));
	aGc.SetPenStyle(CFbsBitGc::ENullPen);
	aGc.SetShadowMode(EFalse);
	aGc.SetStrikethroughStyle(EStrikethroughOff);
	aGc.SetUnderlineStyle(EUnderlineOff);
	aGc.SetUserDisplayMode(ENone);
}
void CSampleContainer::Draw(const TRect& aRect) const
{
	if (!m_bAbort)
    {
		PartialReset(*m_pBackGc);
		//将背景图片画到缓冲区
		m_pBackGc->BitBlt(TPoint(0,0),m_pBitmap_Background);
		//利用蒙版技术将红球图片画到缓冲区
		m_pBackGc->BitBltMasked(m_iBallPos,m_pBitmap_Ball,m_pBitmap_Ball->SizeInPixels(),m_pBitmap_Ball_Mask,ETrue);
		PartialReset(*m_pBackGc);
		//将缓冲区内容画到屏幕上
		m_pDSA->Gc()->BitBlt(TPoint(0,0),m_pBackSurface);
		m_pDSA->ScreenDevice()->Update();

	}
}

// Destructor
CSampleContainer::~CSampleContainer()
    {
	//注意析构顺序
	if (m_pBackGc)
	{
		delete m_pBackGc;
		m_pBackGc = NULL;
	}
	if (m_pBackDevice)
	{
		delete m_pBackDevice;
		m_pBackDevice = NULL;
    }
	if (m_pBackSurface)
	{
		delete m_pBackSurface;
		m_pBackSurface	= NULL;
    }
	if (m_pBmpUtil)
	{
		delete m_pBmpUtil;
		m_pBmpUtil = NULL;
    }

	if (m_pBitmap_Ball)
	{
		delete m_pBitmap_Ball;
		m_pBitmap_Ball = NULL;
	}

	if (m_pBitmap_Background)
	{
		delete m_pBitmap_Background;
		m_pBitmap_Background = NULL;
	}
	
	if (m_pBitmap_Ball_Mask)
	{
		delete m_pBitmap_Ball_Mask;
		m_pBitmap_Ball_Mask = NULL;
	}
	iCoeEnv->RemoveForegroundObserver(*this);

	if (m_pPeriodic)
	{
		m_pPeriodic->Cancel();
		delete m_pPeriodic;
		m_pPeriodic = NULL;
	}
	if (m_pDSA)
	{
		m_pDSA->Cancel();
		delete m_pDSA;
		m_pDSA = NULL;
	}
	
	
}	

// ---------------------------------------------------------
// CSampleContainer::CountComponentControls() const
// ---------------------------------------------------------
//
TInt CSampleContainer::CountComponentControls() const
    {
    return 0; // return nbr of controls inside this container
    }

// ---------------------------------------------------------
// CSampleContainer::ComponentControl(TInt aIndex) const
// ---------------------------------------------------------
//
CCoeControl* CSampleContainer::ComponentControl(TInt aIndex) const
    {
    switch ( aIndex )
        {
        default:
            return NULL;
        }
    }


// ---------------------------------------------------------
// CSampleContainer::HandleControlEventL(
//     CCoeControl* aControl,TCoeEvent aEventType)
// ---------------------------------------------------------
//


// End of File