dsa.cpp

SDL库 在进行视频显示程序spcaview安装时必须的库文件

	const TInt KOffsetToNative = 0;
	const TInt KOffsetTo256 = KOffsetToNative + KCopyFunctions;
	const TInt KOffsetToOtherModes = KOffsetTo256 + KCopyFunctions;
	const TInt KOffsetTo90Functions = 1;
	const TInt KOffsetTo180Functions = 2;
	
	if(iSourceMode == DisplayMode())
		function = KOffsetToNative; 		//0
	else if(iSourceMode == EColor256)
		function = KOffsetTo256;			//4
	else
		function = KOffsetToOtherModes; 	//8
	
	if(iStateFlags & EOrientation90)
		function += KOffsetTo90Functions; 	// + 1
	if(iStateFlags & EOrientation180)
		function += KOffsetTo180Functions; 	//+ 2
	
	iCopyFunction = iCFTable[function];
	
	Wipe();
	}
	
inline void Rotate(TRect& aRect)
	{
	const TInt dx = aRect.iBr.iX - aRect.iTl.iX;
	const TInt dy = aRect.iBr.iY - aRect.iTl.iY;

	aRect.iBr.iX = aRect.iTl.iX + dy;
	aRect.iBr.iY = aRect.iTl.iY + dx;
	
	const TInt tmp = aRect.iTl.iX;
	aRect.iTl.iX = aRect.iTl.iY;
	aRect.iTl.iY = tmp;
	}
	
/*	
int bar = 0;
*/	

TBool CDsa::AddUpdateRect(const TUint8* aBits, const TRect& aUpdateRect, const TRect& aRect)
	{

	if(iStateFlags & EOrientationChanged)
		{
		iStateFlags &= ~EOrientationFlags;
		iStateFlags |= iNewFlags;
		SetCopyFunction();
		iStateFlags &= ~EOrientationChanged;
	    EpocSdlEnv::WaitDeviceChange();
	    return EFalse; //skip this frame as data is may be changed
		}

	if(iTargetAddr == NULL)
		{
		iTargetAddr = LockHwSurface();
		}
		
	TUint8* target = iTargetAddr;
	if(target == NULL)
		return EFalse;
	
	
	TRect targetRect = TRect(TPoint(0, 0), SwSize());
	
	TRect sourceRect = aRect;
	TRect updateRect = aUpdateRect;
	
//	TPoint move(0, 0);
	
	
	if(iStateFlags & EOrientation90)
		{
		Rotate(sourceRect);
		Rotate(updateRect);
		}
		
	if(iSourceMode != DisplayMode() ||  targetRect != sourceRect || targetRect != updateRect || ((iStateFlags & EOrientationFlags) != 0))
		{
		sourceRect.Intersection(targetRect); //so source always smaller or equal than target
		//updateRect.Intersection(targetRect);
		ClipCopy(target, aBits, updateRect, sourceRect);
		}
	else
		{
		const TInt byteCount = aRect.Width() * aRect.Height() * iSourceBpp; //this could be stored
		Mem::Copy(target, aBits, byteCount);
		}

	return ETrue;
	}
	
		
void CDsa::UpdateSwSurface()
	{
	iTargetAddr = NULL;
	UnlockHwSurface();	//could be faster if does not use AO, but only check status before redraw, then no context switch needed
	}
	


	
void CDsa::DoStop()
	{
	if(IsDsaAvailable())
		iStateFlags |= ESdlThreadExplicitStop;
	Stop();
	}

	
void CDsa::Stop()
	{
	iStateFlags &= ~ERunning;
	}
	
void CDsa::Start()
	{
    iStateFlags |= ERunning;
	
	iStateFlags &= ~ESdlThreadExplicitStop;
 
    if(iStateFlags & ESdlThreadSuspend)
    	{
    	EpocSdlEnv::Resume();
    	iStateFlags &= ~ ESdlThreadSuspend;
    	}	
    EpocSdlEnv::ObserverEvent(MSDLObserver::EEventWindowReserved);	
	}


TBool CDsa::Blitter(CFbsBitmap& aBmp)
	{
	return iBlitter && iBlitter->BitBlt(Gc(), aBmp, HwRect(), SwSize());	
	}
	
void CDsa::SetBlitter(MBlitter* aBlitter)
	{
	iBlitter = aBlitter;
	}
	
	
TPoint CDsa::WindowCoordinates(const TPoint& aPoint) const	
	{
	TPoint pos = aPoint - iScreenRect.iTl;
	const TSize asz = iScreenRect.Size();
	if(iStateFlags & EOrientation180)
		{
		pos.iX = asz.iWidth - pos.iX;
		pos.iY = asz.iHeight - pos.iY;	
		}	
	if(iStateFlags & EOrientation90)
		{
		pos.iX = aPoint.iY;
		pos.iY = aPoint.iX;	
		}
	pos.iX <<= 16;
	pos.iY <<= 16;
	pos.iX /= asz.iWidth; 
	pos.iY /= asz.iHeight;
	pos.iX *= iSwSize.iWidth;
	pos.iY *= iSwSize.iHeight;
	pos.iX >>= 16;
	pos.iY >>= 16;
	return pos; 	
	}
	
void CDsa::SetTargetRect()
	{
	iTargetRect = iScreenRect;
	if(iStateFlags & EResizeRequest && EpocSdlEnv::Flags(CSDL::EAllowImageResizeKeepRatio))
		{
		const TSize asz = iScreenRect.Size();
		const TSize sz = iSwSize;
		
		TRect rect;
		
		const TInt dh = (sz.iHeight << 16) / sz.iWidth;

		if((asz.iWidth * dh ) >> 16 <= asz.iHeight)
			{
			rect.SetRect(TPoint(0, 0), TSize(asz.iWidth, (asz.iWidth * dh) >> 16));
			}
		else
			{
			const TInt dw = (sz.iWidth << 16) / sz.iHeight;
	    	rect.SetRect(TPoint(0, 0), TSize((asz.iHeight * dw) >> 16, asz.iHeight));
			}
		rect.Move((asz.iWidth - rect.Size().iWidth) >> 1, (asz.iHeight - rect.Size().iHeight) >> 1);  
		
		iTargetRect = rect;
		iTargetRect.Move(iScreenRect.iTl);

		} 
	if(!(iStateFlags & EResizeRequest))
		iSwSize = iScreenRect.Size();

	}
		

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

void CDsa::Copy256(const CDsa& aDsa, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt)
	{
	TUint32* target = aTarget;
	const TUint32* endt = target + aBytes; 
	const TUint8* source = aSource;
	while(target < endt)
		{
		*target++ = aDsa.iLut256[*source++]; 
		}
	}
	
void CDsa::Copy256Reversed(const CDsa& aDsa, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt)
	{
	const TUint32* target = aTarget;
	TUint32* endt = aTarget + aBytes; 
	const TUint8* source = aSource;
	while(target < endt)
		{
		*(--endt) = aDsa.iLut256[*source++]; 
		}
	}	
	
void CDsa::Copy256Flip(const CDsa& aDsa, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt aLineLen)
	{
	TUint32* target = aTarget;
	const TUint32* endt = target + aBytes; 
	const TUint8* column = aSource;

	while(target < endt)
		{
		*target++ = aDsa.iLut256[*column];
		column += aLineLen;
		}
	}
	
void CDsa::Copy256FlipReversed(const CDsa& aDsa, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt aLineLen)
	{
	const TUint32* target = aTarget;
	TUint32* endt = aTarget + aBytes; 
	const TUint8* column = aSource;

	while(target < endt)
		{
		*(--endt) = aDsa.iLut256[*column];
		column += aLineLen;
		}
	}		

void CDsa::CopyMem(const CDsa& /*aDsa*/, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt)
	{
	const TUint32* src = reinterpret_cast<const TUint32*>(aSource);
	Mem::Copy(aTarget, src, aBytes << 2);
	}
	
void CDsa::CopyMemFlip(const CDsa& /*aDsa*/, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt aLineLen)
	{
	TUint32* target = aTarget;
	const TUint32* endt = target + aBytes; 
	const TUint32* column = reinterpret_cast<const TUint32*>(aSource);

	while(target < endt)
		{
		*target++ = *column;
		column += aLineLen;
		}
	}
	
void CDsa::CopyMemReversed(const CDsa& /*aDsa*/, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt)
	{
	const TUint32* target = aTarget;
	TUint32* endt = aTarget + aBytes; 
	const TUint32* source = reinterpret_cast<const TUint32*>(aSource);
	while(target < endt)
		{
		*(--endt) = *source++; 
		}
	}	
	
	
void CDsa::CopyMemFlipReversed(const CDsa& /*aDsa*/, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt aLineLen)
	{
	const TUint32* target = aTarget;
	TUint32* endt = aTarget + aBytes; 
	const TUint32* column = reinterpret_cast<const TUint32*>(aSource);

	while(target < endt)
		{
		*(--endt) = *column;
		column += aLineLen;
		}
	}
			
/*

LOCAL_C TRgb rgb16MA(TInt aValue)
	{
	return TRgb::Color16MA(aValue);
	}
*/	
NONSHARABLE_CLASS(MRgbCopy)
	{
	public:
	virtual void Copy(TUint32* aTarget, const TUint8* aSource, TInt aBytes, TBool aReversed) = 0;
	virtual void FlipCopy(TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt aLineLen, TBool aReversed) = 0;
	};
	
template <class T>
NONSHARABLE_CLASS(TRgbCopy) : public MRgbCopy
	{
	public:
	TRgbCopy(TDisplayMode aMode);
	void* operator new(TUint aBytes, TAny* aMem);
	void Copy(TUint32* aTarget, const TUint8* aSource, TInt aBytes, TBool aReversed);
	void FlipCopy(TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt aLineLen, TBool aReversed);
	static TUint32 Gray256(const TUint8& aPixel);
	static TUint32 Color256(const TUint8& aPixel);
	static TUint32 Color4K(const TUint16& aPixel);
	static TUint32 Color64K(const TUint16& aPixel);
	static TUint32 Color16M(const TUint32& aPixel);
	static TUint32 Color16MU(const TUint32& aPixel);
	static TUint32 Color16MA(const TUint32& aPixel);
	private:
		typedef TUint32 (*TRgbFunc) (const T& aValue);
		TRgbFunc iFunc;
	};
		
		
template <class T>		
void* TRgbCopy<T>::operator new(TUint /*aBytes*/, TAny* aMem)
	{
	return aMem;
	}
		
template <class T>
TRgbCopy<T>::TRgbCopy(TDisplayMode aMode)
	{
	switch(aMode)
		{
		case EGray256 : iFunc = (TRgbFunc) Gray256; break;
		case EColor256 : iFunc =  (TRgbFunc) Color256; break;
		case EColor4K : iFunc =  (TRgbFunc) Color4K; break;
		case EColor64K : iFunc =  (TRgbFunc) Color64K; break;
		case EColor16M : iFunc =  (TRgbFunc) Color16M; break;
		case EColor16MU : iFunc =  (TRgbFunc) Color16MU; break;
		case EColor16MA : iFunc =  (TRgbFunc) Color16MA; break;
		default:
			PANIC(KErrNotSupported);
		}
	}
	
template <class T>
void TRgbCopy<T>::Copy(TUint32* aTarget, const TUint8* aSource, TInt aBytes, TBool aReversed)
	{
	const T* source = reinterpret_cast<const T*>(aSource);
	TUint32* target = aTarget;
	TUint32* endt = target + aBytes;
	
	if(aReversed)
		{
		while(target < endt)
			{
			const T value = *source++;
			*(--endt) = iFunc(value);//iFunc(value).Value();
			}
		}
	else
		{
		while(target < endt)
			{
			const T value = *source++;
			*target++ = iFunc(value);//iFunc(value).Value();
			}
		}
	}
	
template <class T>
void TRgbCopy<T>::FlipCopy(TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt aLineLen, TBool aReversed)
	{
	const T* column = reinterpret_cast<const T*>(aSource);
	TUint32* target = aTarget;
	TUint32* endt = target + aBytes;
	
	if(aReversed)
		{
		while(target < endt)
			{
			*(--endt) = iFunc(*column);
			column += aLineLen;
			}
		}
	else
		{
		while(target < endt)
			{
			*target++ = iFunc(*column);
			column += aLineLen;
			}
		}
	}	
		
template <class T> TUint32 TRgbCopy<T>::Gray256(const TUint8& aPixel)
	{
	const TUint32 px = aPixel << 16 | aPixel << 8 | aPixel;
	return px;
	}
	
template <class T> TUint32 TRgbCopy<T>::Color256(const TUint8& aPixel)
	{
	return TRgb::Color256(aPixel).Value();
	}
	
template <class T> TUint32 TRgbCopy<T>::Color4K(const TUint16& aPixel)
	{
	TUint32 col = (aPixel & 0xF00) << 12;
	col |= (aPixel & 0xF00) << 8; 
	
	col |= (aPixel & 0x0F0) << 8;
	col |= (aPixel & 0x0F0);
	
	col |= (aPixel & 0x00F) << 4;
	col |= (aPixel & 0x00F);
	
	return col;
	}
	
template <class T> TUint32 TRgbCopy<T>::Color64K(const TUint16& aPixel)
	{
	TUint32 col = (aPixel & 0xF800)<< 8;
	col |= (aPixel & 0xE000) << 3; 
	
	col |= (aPixel & 0x07E0) << 5;
	col |= (aPixel & 0xC0) >> 1;
	
	col |= (aPixel & 0x07E0) << 3;
	col |= (aPixel & 0x1C) >> 2;
	
	return col;
	}
	
template <class T> TUint32 TRgbCopy<T>::Color16M(const TUint32& aPixel)
	{
	return TRgb::Color16M(aPixel).Value();
	}
	
template <class T> TUint32 TRgbCopy<T>::Color16MU(const TUint32& aPixel)
	{
	return TRgb::Color16MU(aPixel).Value();
	}
	
template <class T> TUint32 TRgbCopy<T>::Color16MA(const TUint32& aPixel)
	{
	return TRgb::Color16MA(aPixel).Value();
	}

typedef TUint64 TStackMem;

LOCAL_C MRgbCopy* GetCopy(TAny* mem, TDisplayMode aMode)
	{
	if(aMode == EColor256 || aMode == EGray256)
		{
		return new (mem) TRgbCopy<TUint8>(aMode);
		}
	if(aMode == EColor4K || aMode == EColor64K)
		{
		return new (mem) TRgbCopy<TUint16>(aMode);
		}
	if(aMode == EColor16M || aMode == EColor16MU || aMode == EColor16MA)
		{
		return new (mem) TRgbCopy<TUint32>(aMode);
		}
	PANIC(KErrNotSupported);
	return NULL;
	}
	

void CDsa::CopySlowFlipReversed(const CDsa& aDsa, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt aLineLen)
	{
	TStackMem mem = 0;
	GetCopy(&mem, aDsa.iSourceMode)->FlipCopy(aTarget, aSource, aBytes, aLineLen, ETrue);	
	}
	
void CDsa::CopySlowFlip(const CDsa& aDsa, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt aLineLen)
	{
	TStackMem mem = 0;
	GetCopy(&mem, aDsa.iSourceMode)->FlipCopy(aTarget, aSource, aBytes, aLineLen, EFalse);
	}
	
void CDsa::CopySlow(const CDsa& aDsa, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt)
	{
	TStackMem mem = 0;
	GetCopy(&mem, aDsa.iSourceMode)->Copy(aTarget, aSource, aBytes, EFalse);	
	}	

void CDsa::CopySlowReversed(const CDsa& aDsa, TUint32* aTarget, const TUint8* aSource, TInt aBytes, TInt)
	{
	TStackMem mem = 0;
	GetCopy(&mem, aDsa.iSourceMode)->Copy(aTarget, aSource, aBytes, ETrue);	
	}	

////////////////////////////////////////////////////////////////////////////////////////////////////////////////7