dsa.cpp

SDL库 在进行视频显示程序spcaview安装时必须的库文件

	public:
		CDsbSurface(MDsbObs& aDsb);
		TUint8* Address();
		void Complete();
		~CDsbSurface();
	private:
		void RunL();
		void DoCancel();
	private:
		MDsbObs& iDsb; 
		TUint8* iAddress;
	};	

CDsbSurface::CDsbSurface(MDsbObs& aDsb) : CActive(CActive::EPriorityHigh) , iDsb(aDsb)
	{
	CActiveScheduler::Add(this);
	}

CDsbSurface::~CDsbSurface()
	{
	Cancel();
	}
	
void CDsbSurface::Complete()
	{
	if(iAddress != NULL && !IsActive())
		{
		iAddress = NULL;
		SetActive();
		iDsb.Dsb().EndUpdate(iStatus);
		}
	}
	
TUint8* CDsbSurface::Address()
	{
	if(iAddress == NULL && !IsActive())
		{
		TAcceleratedBitmapInfo info;
		if(KErrNone == iDsb.Dsb().BeginUpdate(info))
			iAddress = info.iAddress;
		}
	return iAddress;
	}
	
void CDsbSurface::RunL()
	{
	iDsb.SurfaceReady();
	}

void CDsbSurface::DoCancel()
	{
	//empty
	}
		
NONSHARABLE_CLASS(CDsaB) : public CDsaBase,
 public MDsbObs
	{
	public:
		CDsaB(RWsSession& aSession, TInt aFlags);
	private:
		~CDsaB();
		TUint8* LockSurface();
		void UnlockHWSurfaceRequestComplete();
		void UnlockHwSurface();
		void CreateSurfaceL();
		void Wipe(TInt aLength);
		void RecreateL();
		void ConstructL(RWindow& aWindow, CWsScreenDevice& aDevice);
		CDirectScreenBitmap& Dsb();
		void SurfaceReady();
		TInt ExternalUpdate();
	private:
		CDsbSurface* iSurface1;
		CDsbSurface* iSurface2;
		CDirectScreenBitmap* iDsb;
		TInt iType;
	};

CDsaB::CDsaB(RWsSession& aSession, TInt aFlags) : CDsaBase(aSession), iType(aFlags)
	{
	}


	
void CDsaB::UnlockHWSurfaceRequestComplete()
	{
	iSurface1->Complete();
	if(iSurface2 != NULL)
		iSurface2->Complete();
	}	

void CDsaB::CreateSurfaceL()
	{
	__ASSERT_ALWAYS(SwSize() == HwRect().Size(), PANIC(KErrNotSupported));
	}
	
void CDsaB::Wipe(TInt aLength) //dont call in drawing
	{
	TUint8* addr = LockSurface();
	if(addr != NULL) 
		{
		Mem::FillZ(addr, aLength);
		UnlockHwSurface();
		}
	}
	

void CDsaB::UnlockHwSurface()
	{
	EpocSdlEnv::Request(CDsa::ERequestUpdate);
	}
	
TUint8* CDsaB::LockSurface()
	{
	TUint8* addr =  iSurface1->Address();
	if(addr == NULL && iSurface2 != NULL)
		addr =  iSurface2->Address();
	SetUpdating(addr == NULL);
	return addr;
	}
	
void CDsaB::SurfaceReady()	
	{
	SetUpdating(EFalse);
	}

CDirectScreenBitmap& CDsaB::Dsb()
	{
	return *iDsb;
	}
	
void CDsaB::ConstructL(RWindow& aWindow, CWsScreenDevice& aDevice)
	{
	if(iDsb == NULL)
		iDsb = CDirectScreenBitmap::NewL();	
	CDsaBase::ConstructL(aWindow, aDevice);
	if(iSurface1 == NULL)	
		iSurface1 = new (ELeave) CDsbSurface(*this);
	if(iSurface2 == NULL && iType & CDirectScreenBitmap::EDoubleBuffer)
		iSurface2 = new (ELeave) CDsbSurface(*this);
	}
	
CDsaB::~CDsaB()
	{
	delete iSurface1;
	delete iSurface2;
	delete iDsb;
	}	

void CDsaB::RecreateL()
	{
    iDsb->Close();
    iDsb->Create(HwRect(), CDirectScreenBitmap::TSettingsFlags(iType));
	}
	
TInt CDsaB::ExternalUpdate()
	{
	if(LockSurface())
		{
		UnlockHWSurfaceRequestComplete();
		return KErrNone;
		}
	return KErrNotReady;
	}
		

/////////////////////////////////////////////////////////////////////////////////////////////////////	



CDsa* CDsa::CreateL(RWsSession& aSession)
	{
	if(EpocSdlEnv::Flags(CSDL::EDrawModeDSB))
		{
		TInt flags = CDirectScreenBitmap::ENone;
		if(EpocSdlEnv::Flags(CSDL::EDrawModeDSBDoubleBuffer))
			flags |= CDirectScreenBitmap::EDoubleBuffer;
		if(EpocSdlEnv::Flags(CSDL::EDrawModeDSBIncrementalUpdate))
			flags |= CDirectScreenBitmap::EIncrementalUpdate;
		return new (ELeave) CDsaB(aSession, flags);
		}
	else if(EpocSdlEnv::Flags(CSDL::EDrawModeGdi))
		{
		return new (ELeave) CBitmapSurface<CDsaBitgdi>(aSession);
		}
    else
    	{
        return new (ELeave) CBitmapSurface<CDsaA>(aSession);
		}
	}
	
	
void CDsa::RecreateL()
	{
	}

void CDsa::Free()
	{
	}
	
TSize CDsa::WindowSize() const
	{
	TSize size = iSwSize;
	if(iStateFlags & EOrientation90)
		{
		const TInt tmp = size.iWidth;
		size.iWidth = size.iHeight;
		size.iHeight = tmp;
		}
	return size;
	}
	
void CDsa::SetSuspend()
	{
	iStateFlags |= ESdlThreadSuspend;
	}


void CDsa::SetUpdating(TBool aUpdate)
	{
	if(aUpdate)
		iStateFlags |= EUpdating;
	else
		iStateFlags &= ~EUpdating;
	}


TBool CDsa::Stopped() const
	{
	return (iStateFlags & ESdlThreadExplicitStop);
	}

void CDsa::SetOrientation(CSDL::TOrientationMode aOrientation)
	{
	TInt flags = 0;
	switch(aOrientation)
		{
		case CSDL::EOrientation90:
			flags = EOrientation90;
			break;
		case CSDL::EOrientation180:
			flags = EOrientation180;
			break;
		case CSDL::EOrientation270:
			flags = EOrientation90 | EOrientation180;
			break;
		case CSDL::EOrientation0:
			flags = 0;
			break;
		}
	if(flags != (iStateFlags & EOrientationFlags))
		{
		iStateFlags |= EOrientationChanged;
		iNewFlags = flags; //cannot be set during drawing...
		}
	}

CDsa::~CDsa()
    {
    iOverlays.Close();
    User::Free(iLut256);
    }
         
void CDsa::ConstructL(RWindow& aWindow, CWsScreenDevice& /*aDevice*/)
    {			
	if(iLut256 == NULL)
		iLut256 = (TUint32*) User::AllocL(256 * sizeof(TUint32));
	iTargetMode = aWindow.DisplayMode();
	iTargetBpp = BytesPerPixel(DisplayMode());
	iScreenRect = TRect(aWindow.Position(), aWindow.Size());
	SetTargetRect();
    }
    
void CDsa::DrawOverlays()
	{
	const TInt last = iOverlays.Count() - 1;
	for(TInt i = last; i >= 0 ; i--)
		iOverlays[i].iOverlay->Draw(Gc(), HwRect(), SwSize());
	}

TInt CDsa::AppendOverlay(MOverlay& aOverlay, TInt aPriority)
	{
	TInt i;
	for(i = 0; i < iOverlays.Count() && iOverlays[i].iPriority < aPriority; i++)
		{}
	const TOverlay overlay = {&aOverlay, aPriority};
	return iOverlays.Insert(overlay, i);
	}
	
TInt CDsa::RemoveOverlay(MOverlay& aOverlay)
	{
	for(TInt i = 0; i < iOverlays.Count(); i++)
		{
		if(iOverlays[i].iOverlay == &aOverlay)
			{
			iOverlays.Remove(i);
			return KErrNone;
			}
		}
	return KErrNotFound;
	}

void CDsa::LockPalette(TBool aLock)
	{
	if(aLock)
		iStateFlags |= EPaletteLocked;
	else
		iStateFlags &= ~EPaletteLocked;
	}
TInt CDsa::SetPalette(TInt aFirst, TInt aCount, TUint32* aPalette)
	{
	if(iLut256 == NULL)
		return KErrNotFound;
	const TInt count = aCount - aFirst;
	if(count > 256)
		return KErrArgument;
	if(iStateFlags & EPaletteLocked)
		return KErrNone;
	for(TInt i = aFirst; i < count; i++) //not so busy here:-)
		{
		iLut256[i] = aPalette[i];
		}
	return KErrNone;
	}
	
	


    
CDsa::CDsa(RWsSession& aSession) : 
 	iStateFlags(0),
 	iSession(aSession)
  
	{
//	CActiveScheduler::Add(this);
	iCFTable[0] = CopyMem;
	iCFTable[1] = CopyMemFlipReversed;
	iCFTable[2] = CopyMemReversed;
	iCFTable[3] = CopyMemFlip;	
	
	iCFTable[4] = Copy256;
	iCFTable[5] = Copy256FlipReversed;
	iCFTable[6] = Copy256Reversed;
	iCFTable[7] = Copy256Flip;	
	
	
	iCFTable[8] = CopySlow;
	iCFTable[9] = CopySlowFlipReversed;
	iCFTable[10] = CopySlowReversed;
	iCFTable[11] = CopySlowFlip;	
	}
	
RWsSession& CDsa::Session()
	{
	return iSession;
	}

TInt CDsa::RedrawRequest()
	{
	if(!(iStateFlags & (EUpdating) && (iStateFlags & ERunning)))
		{
		return ExternalUpdate();
		}
	return KErrNotReady;
	}

TUint8* CDsa::LockHwSurface()
	{
	if((iStateFlags & EUpdating) == 0) //else frame is skipped
		{
		return LockSurface();
		}
	return NULL; 
	}

/*	
void CDsa::RunL()
	{
	iStateFlags &= ~EUpdating;
	}
		
	
void CDsa::DoCancel()
	{
	iStateFlags &= ~EUpdating;
	//nothing can do, just wait?
	}
*/	

	
TInt CDsa::AllocSurface(TBool aHwSurface, const TSize& aSize, TDisplayMode aMode)
	{
	if(aHwSurface && aMode != DisplayMode())
		return KErrArgument;
	
	iSourceMode = aMode;
	
	iSourceBpp = BytesPerPixel(aMode);
	
	const TSize size = WindowSize();
	if(aSize.iWidth > size.iWidth)
		return KErrTooBig;
	if(aSize.iHeight > size.iHeight)
		return KErrTooBig;
	
	TRAPD(err, CreateSurfaceL());
	if(err != KErrNone)
		return err;

	SetCopyFunction();
	
	return KErrNone;
	}
	

void CDsa::CreateZoomerL(const TSize& aSize)
	{
	iSwSize = aSize;
	iStateFlags |= EResizeRequest;
	CreateSurfaceL();
	SetTargetRect();
	}
	

/*
void SaveBmp(const TDesC& aName, const TAny* aData, TInt aLength, const TSize& aSz, TDisplayMode aMode)
	{
	CFbsBitmap* s = new CFbsBitmap();
	s->Create(aSz, aMode);
	s->LockHeap();
	TUint32* addr = s->DataAddress();
	Mem::Copy(addr, aData, aLength);
	s->UnlockHeap();
	s->Save(aName);
	s->Reset();
	delete s;
	}
	
void SaveBmp(const TDesC& aName, const TUint32* aData, const TSize& aSz)
	{
	CFbsBitmap* s = new CFbsBitmap();
	s->Create(aSz, EColor64K);
	TBitmapUtil bmp(s);
	bmp.Begin(TPoint(0, 0));
	for(TInt j = 0; j < aSz.iHeight; j++)
		{
		bmp.SetPos(TPoint(0, j));
		for(TInt i = 0; i < aSz.iWidth; i++)
			{
			bmp.SetPixel(*aData);
			aData++;
			bmp.IncXPos();
			}
		}
	bmp.End();
	s->Save(aName);
	s->Reset();
	delete s;
	}	
	
TBuf<16> FooName(TInt aFoo)
	{
	TBuf<16> b;
	b.Format(_L("C:\\pic%d.mbm"), aFoo);
	return b;
	}
	
*/


void CDsa::ClipCopy(TUint8* aTarget,
 					const TUint8* aSource,
 					const TRect& aUpdateRect,
 					const TRect& aSourceRect) const
 		{
 		const TDsa dsa(*this);
 		switch(iSourceBpp)
 			{
 			case 1:
 				::ClipCopy<TUint32, TUint8>(dsa, aTarget, aSource, aUpdateRect, aSourceRect);
 				break;
 			case 2:
 				::ClipCopy<TUint32, TUint16>(dsa, aTarget, aSource, aUpdateRect, aSourceRect);
 				break;
 			case 4:
 				::ClipCopy<TUint32, TUint32>(dsa, aTarget, aSource, aUpdateRect, aSourceRect);
 				break;
 			}
 		}	


void CDsa::Wipe() //dont call in drawing
	{
	if(IsDsaAvailable())
		Wipe(iTargetBpp * SwSize().iWidth * SwSize().iHeight);
	}
	
void CDsa::SetCopyFunction()
	{
	//calculate offset to correct function in iCFTable according to given parameters
	TInt function = 0;
	const TInt KCopyFunctions = 4;