swblt.cpp

windows ce 3.00 嵌入式操作系统源代码

	{
		// Back up the source and mask row increments because they will be altered dynamically
		originalMaskRowInc = mask.RowIncrement;
		originalSrcRowInc = src.RowIncrement;
		DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("yStretch:%d yShrink:%d yDMinor:%d yDMajor:%d yAccum:%d\n"),
			yStretch, yShrink, yDMinor, yDMajor, yAccum ));
	}

	if( pParms->rop4 == 0x0000 )
	{
		src.Value = 0;
	}
	else if( pParms->rop4 == 0xffff )
	{
		src.Value = dst.Mask;
	}
	else
	{
		src.Value = pParms->solidColor & dst.Mask;
		if(	   ( maskedROP3 != unmaskedROP3 )
		    || transparentBlt
			|| xShrinkStretch
		    || ( rop3 != 0xCC && ( rop3 != 0xF0 || pParms->pBrush ) ) )
		{
			DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Complex Blt!\r\n")));
			DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("transparent:%d,masked:%2x,unmasked:%2x,rop3:%2x,mask.RowPtr:%08x\r\n"),
				transparentBlt,maskedROP3, unmaskedROP3, rop3, mask.RowPtr ));
			complexBlt = 1;
		}
	}
	brush.Value = src.Value;

	while( height-- )
	{
		// Handle y Shrinking or stretching
		if( yShrinkStretch )
		{
			if( yShrink )
			{
				while( yAccum < 0 )	// skip source line(s) if shrinking
				{
					DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("yShrink - skip line\r\n")));
					src.RowPtr += src.RowIncrement;
					mask.RowPtr += mask.RowIncrement;
					yAccum += yDMinor;
				}
				yAccum += yDMajor;
			}
			else
			{
				if( yAccum < 0 )
				{
					// repeat source line if stretching
					yAccum += yDMinor;		// yDMinor is a small +ve number
					if( yStretch )
					{
						DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("yStretch - Repeat. Accum=%d\r\n"), yAccum));
						src.RowIncrement = 0;
						mask.RowIncrement = 0;
					}
				}
				else
				{
					DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("yStretch - Switch to next after this Accum=%d\r\n"), yAccum));
					// Switch to next source line  (after this row)
					yAccum += yDMajor;		// yDMajor is a large -ve value (i.e. |yDMajor| > |yDMinor| )
					src.RowIncrement = originalSrcRowInc;
					mask.RowIncrement = originalMaskRowInc;
				}
			}
		}


		// Move all iterators to next line
		if( src.RowPtr )
		{
			src.Ptr = src.RowPtr;
			src.RowPtr += src.RowIncrement;
			if( ! src.Is24Bit )
			{
				src.Cache = *(unsigned long *)src.Ptr;
				src.CacheState = src.CacheStateNewRow;
			}
		}
		if( mask.RowPtr )
		{
//			DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Incrementing mask.RowPtr\r\n")));
			mask.Ptr = mask.RowPtr;
			mask.RowPtr += mask.RowIncrement;
			mask.Cache = *(UNALIGNED unsigned long *)mask.Ptr;
			mask.CacheState = mask.CacheStateNewRow;
		}
		if( brush.RowPtr )
		{
//			DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Incrementing brush.RowPtr\r\n")));
			brush.Ptr = brush.RowPtr;
			brush.LeftRowPtr = brush.Ptr - (brush.FirstRowPtr - (unsigned char *)(pParms->pBrush->Buffer()));
			if( --brush.RowsRemaining )
				brush.RowPtr += brush.RowIncrement;
			else
			{
				brush.RowPtr = brush.FirstRowPtr;
				brush.RowsRemaining = brush.Rows;
			}
			brush.Cache = *(unsigned long *)brush.Ptr;
			brush.CacheState = brush.CacheStateNewRow;
			brush.PixelsRemaining = brush.RowInitialPixelsRemaining;
//			DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Brush Ptr = 0x%08x, next row:%08x\r\n"),
//			    brush.Ptr, brush.RowPtr));
		}
//		DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Incrementing dst.RowPtr\r\n")));
		dst.Ptr = dst.RowPtr;
		dst.RowPtr += dst.RowIncrement;

		if( !quickWrite )
		{
			dst.Cache = *(unsigned long *)dst.Ptr;
			dst.CacheState = dst.CacheStateNewRow;
		}

		if( xStretch )
		{
			prevMaskPtr = mask.Ptr;
			prevMaskCache = mask.Cache;
			prevMaskCacheState = mask.CacheState;
			prevSrcPtr = src.Ptr;
			prevSrcCache = src.Cache;
			prevSrcCacheState = src.CacheState;
		}

		xAccum = rowXAccum;

		for( x=0; x<width; x++ )
		{
//			DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("x=%d\r\n"), x));

			if( src.Ptr )
			{


//				DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Reading source pixel\r\n")));

				// Read the next pixel in and convert to same depth as destination

				if( src.Is24Bit )	// Since 24-bit packed pixels cross dword boundaries:
				{
					src.Value = ( *src.Ptr ) + ( *(src.Ptr+1) << 8 ) +	( *(src.Ptr+2) << 16 );
					src.Ptr += src.BytesPerAccess;
				}
				else
				{
					if( !(src.CacheState&0x00ff00) )	// Check bits remaining in src.Cache
					{
						src.Ptr += src.BytesPerAccess;			// increment src.Ptr
						src.CacheState = src.CacheStateNewDWord;
						src.Cache = *(unsigned long *)src.Ptr;	// reload src.Cache
					}
					src.Value = src.Cache >> ( (src.CacheState >> 16) ^ src.MaskShiftXor );
					src.CacheState += src.CacheStateIncrement;		 
				}
				originalSrc = ( src.Value &= src.Mask );
				if( pParms->pLookup )
					src.Value = (pParms->pLookup)[src.Value];
				if( pParms->pConvert )
				{
					src.Value = (pParms->pColorConverter->*(pParms->pConvert))( src.Value );
				}	
					// pParms->pConvert( pParms->pColorConverter, src.Value );
			}
			
			if( complexBlt )	// brushed, masked, transparent, unusual rop3 etc
			{
				if( brush.Ptr )
				{
//					DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Reading brush pixel\r\n")));

					// Note that the brush will already have been converted to the same
					// depth as the destination (if they weren't the same).
					// The exception is if the dest is 24Bpp. In this case, the brush
					// will have been converted to 32Bpp for simplicity.
					// See DrvRealizeBrush for details

					if( !(brush.PixelsRemaining--) )	// Check for wrapping off right edge of pattern
					{
						brush.Ptr = brush.LeftRowPtr;
						brush.PixelsRemaining = brush.PixelsPerRow-1;
						brush.CacheState = brush.CacheStateNewDWord;
						brush.Cache = *(unsigned long *)brush.Ptr;	// reload brush.Cache
					}
					else if( !(brush.CacheState&0x00ff00) )	// Check bits remaining in brush.Cache
					{
						brush.Ptr += brush.BytesPerAccess;				// increment brush.Ptr
						brush.CacheState = brush.CacheStateNewDWord;
						brush.Cache = *(unsigned long *)brush.Ptr;	// reload brush.Cache
					}
					brush.Value = brush.Cache >> ( (brush.CacheState >> 16) ^ brush.MaskShiftXor );
					brush.CacheState += brush.CacheStateIncrement;		 
				}
				if( mask.Ptr ) // This selects between two rop3's
				{
//					DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Reading mask pixel\r\n")));
					if( !(mask.CacheState&0x00ff00) )	// check bits remaining in mask cache
					{
						mask.Ptr += mask.BytesPerAccess;	//  == +/- 4
						mask.CacheState = mask.CacheStateNewDWord;
						mask.Cache = *(UNALIGNED unsigned long *)mask.Ptr;
					}
					rop3 = ( mask.Cache & ( 1 << ( (mask.CacheState >> 16) ^ mask.MaskShiftXor ) ) ) ? unmaskedROP3 : maskedROP3;
					mask.CacheState += mask.CacheStateIncrement;
				}

				if( xShrinkStretch )
				{
					// Handle x Stretching
					if( xStretch )
					{
						if( xAccum < 0 )	// Repeat this pixel
						{
							xAccum += xDMinor;
							mask.Ptr = prevMaskPtr;
							mask.Cache = prevMaskCache;
							mask.CacheState = prevMaskCacheState;
							src.Ptr = prevSrcPtr;
							src.Cache = prevSrcCache;
							src.CacheState = prevSrcCacheState;
						}
						else				// OK to move to next source pixel after this
						{
							xAccum += xDMajor;
							prevMaskPtr = mask.Ptr;
							prevMaskCache = mask.Cache;
							prevMaskCacheState = mask.CacheState;
							prevSrcPtr = src.Ptr;
							prevSrcCache = src.Cache;
							prevSrcCacheState = src.CacheState;
						}
					}
					else	// xShrink
					{
						while( xAccum < 0 )		// Skip pixel(s)
						{
							// Move to next src pixel
							if( src.Is24Bit )	// Since 24-bit packed pixels cross dword boundaries:
								src.Ptr += src.BytesPerAccess;
							else
							{
								if( !(src.CacheState&0x00ff00) )	// Check bits remaining in src.Cache
								{
									src.Ptr += src.BytesPerAccess;			// increment src.Ptr
									src.CacheState = src.CacheStateNewDWord;
                                    if (x != width - 1 )
									    src.Cache = *(unsigned long *)src.Ptr;	// reload src.Cache
								}
								src.CacheState += src.CacheStateIncrement;		 
							}
							// Move to next mask pixel
							if( pParms->pMask )
							{
								if( !(mask.CacheState&0x00ff00) )	// check bits remaining in mask cache
								{
									mask.Ptr += mask.BytesPerAccess;		//  == +/- 4
									mask.CacheState = mask.CacheStateNewDWord;
								    mask.Cache = *(UNALIGNED unsigned long *)mask.Ptr;
								}
								mask.CacheState += mask.CacheStateIncrement;
							}
							xAccum += xDMinor;
						}
						xAccum += xDMajor;
					}
				}
				if( dstMatters )		// The underlying rop4 utilizes the dst.
				{
//					DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Reading dst pixel\r\n")));
					// We maintain dst.Cache valid at all times if not doing quickWrite
					if( quickWrite )
					{
						switch(dst.Bpp)
						{
						case 8:
								*(unsigned char *)&dst.Value = *(unsigned char *)dst.Ptr;
								break;
						case 16:
								*(unsigned short *)&dst.Value = *(unsigned short *)dst.Ptr;
								break;
						case 32:
								*(unsigned long *)&dst.Value = *(unsigned long *)dst.Ptr;
								break;
						case 24:
								dst.Value = ( *dst.Ptr ) + ( *(dst.Ptr+1) << 8 ) +	( *(dst.Ptr+2) << 16 );
						}
					}
					else
						dst.Value = dst.Cache >> ( ( dst.CacheState >> 16 ) ^ dst.MaskShiftXor );
				}

				switch( rop3 )
				{
					// The compiler sorts these and creates a binary search set of tests to
					// get to an entry quickly.  Branch "prediction" helps this a lot.
					// Remember that masked rop4s makes NOP and SRCCOPY quite a likely rop3
					case 0xAA: break;					  					   // NOP
					case 0xCC: break; 										   // SRCCOPY
					case 0x00: src.Value = 0;							break; // BLACKNESS
					case 0x22: src.Value = (~src.Value) & dst.Value;	break; // no-name
					case 0xB8: src.Value = (brush.Value & ~src.Value)|(src.Value & dst.Value);	break; // no-name
					case 0x11: src.Value = ~(src.Value | dst.Value);	break; // NOTSRCERASE
					case 0x33: src.Value = ~src.Value;					break; // NOTSRCCOPY
					case 0x44: src.Value &= ~dst.Value;					break; // SRCERASE
					case 0x55: src.Value = ~dst.Value;					break; // DSTINVERT
					case 0x5A: src.Value = brush.Value ^ dst.Value;		break; // PATINVERT
					case 0x66: src.Value ^= dst.Value;					break; // SRCINVERT
					case 0x88: src.Value &= dst.Value;					break; // SRCAND
					case 0xBB: src.Value = ~src.Value | dst.Value;		break; // MERGEPAINT
					case 0xC0: src.Value &= brush.Value;				break; // MERGECOPY
					case 0xEE: src.Value |= dst.Value;					break; // SRCPAINT
					case 0xF0: src.Value = brush.Value;					break; // PATCOPY
					case 0xFB: src.Value = brush.Value | ~src.Value | dst.Value; break; // PATPAINT
					case 0xFF: src.Value = 0xFFFFFFFF;					break; // WHITENESS
               case 0xE2: src.Value = ( dst.Value & ~src.Value ) | ( brush.Value & src.Value ); break;
               case 0xAC: src.Value = ((src.Value^dst.Value)&brush.Value)^src.Value; break;
					default:   src.Value = ProcessROP3(dst.Value,src.Value,brush.Value,rop3,dst.Bpp);
				}

				src.Value &= dst.Mask;

				if( rop3 == 0xAA || ( transparentBlt && ( originalSrc == transparentColor ) ) )
				{
//					DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("NOT writing pixel\r\n")));
					// we won't write this pixel
					if( quickWrite )
						dst.Ptr += dst.BytesPerAccess;
					else
					{
						dst.CacheState += dst.CacheStateIncrement; // leave dirty flag as-is
						if( !(dst.CacheState&0x00ff00) ) // Check bits remaining in dst cache
						{
							if( dst.CacheState & 0x0000ff )
								*(unsigned long *)dst.Ptr = dst.Cache;	// flush cache
							dst.CacheState = dst.CacheStateNewDWord;		// clears dirty flag
							dst.Ptr += dst.BytesPerAccess;					// +/- 4
							dst.Cache = *(unsigned long *)dst.Ptr;
						}
					}
					continue;
				}
			}

//			DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Writing pixel\r\n")));
			// Now, we are ready to write the value from src.Value into the dst pixel
			if( quickWrite )
			{
				switch(dst.Bpp)
				{
				case 8:
						*(unsigned char *)dst.Ptr = (unsigned char)src.Value;
						break;
				case 16:
						*(unsigned short *)dst.Ptr = (unsigned short)src.Value;
						break;
				case 32:
						*(unsigned long *)dst.Ptr = (unsigned long)src.Value;
						break;
				case 24:
						*dst.Ptr = (unsigned char)(src.Value);
						*(dst.Ptr+1) = (unsigned char)(src.Value>>8);
						*(dst.Ptr+2) = (unsigned char)(src.Value>>16);
				}
				dst.Ptr += dst.BytesPerAccess;
			}
			else
			{
//				DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Old Cache: 0x%08x, Cache State: 0x%08x, Ptr: 0x%08x\r\n"),
//					dst.Cache, dst.CacheState, dst.Ptr));
				unsigned char tmpShift = (unsigned char)(( dst.CacheState >> 16 ) ^ dst.MaskShiftXor);
				dst.Cache &= ~( dst.Mask << tmpShift);
				dst.Cache |= src.Value << tmpShift;
				dst.CacheState += dst.CacheStateIncrementDirty;  // sets dirty flag
				if( !(dst.CacheState&0x00ff00) ) // Check bits remaining in dst cache
				{
//					DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Writing 0x%08x to Ptr: 0x%08x\r\n"),
//						dst.Cache, dst.Ptr ));
					
					*(unsigned long *)dst.Ptr = dst.Cache;	// flush cache (we know it was dirty)
					dst.CacheState = dst.CacheStateNewDWord;	// clears dirty flag
					dst.Ptr += dst.BytesPerAccess;				// +/- 4
                    if (x != width - 1 )
    					dst.Cache = *(unsigned long *)dst.Ptr;
				}
//				DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("New Cache: 0x%08x, Cache State: 0x%08x, Ptr: 0x%08x\r\n"),
//					dst.Cache, dst.CacheState, dst.Ptr));
			}

		} // next column
		if( dst.CacheState & 0x0000ff )
			*(unsigned long *)dst.Ptr = dst.Cache;	// flush cache
	} // next row

	return S_OK;
}

unsigned long ProcessROP3(
	unsigned long dstValue,
	unsigned long srcValue,
	unsigned long brushValue,
	unsigned char rop3,
	unsigned char dstBitsPerPixel)
{
	if( dstBitsPerPixel > 24 )
	{
		// Break into two halves, otherwise the brushValue<<=2 below will overflow
		return ProcessROP3(dstValue,srcValue,brushValue,rop3,16) |
			( ProcessROP3(dstValue>>16,srcValue>>16,brushValue>>16,rop3,dstBitsPerPixel-16) << 16);
	}

	DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("Process rop3=%02x, numbits=%d, pattern=%04x, source=%04x, dest=%04x, "),
		rop3,dstBitsPerPixel,brushValue,srcValue,dstValue ));


	unsigned long result = 0;
	unsigned long rsltBit = 1;

	brushValue <<= 2;
	srcValue <<= 1;

	while( dstBitsPerPixel-- )
	{
		if( ( 1<< ( brushValue&4 | srcValue&2 | dstValue&1 ) ) & rop3 )
			result |= rsltBit;
		brushValue >>= 1;
		srcValue >>= 1;
		dstValue >>= 1;
		rsltBit <<=1;
	}
	DEBUGMSG(GPE_ZONE_BLT_LO,(TEXT("resuult=%04x\r\n"), result));

	return result;
}