⭐ 欢迎来到虫虫下载站! | 📦 资源下载 📁 资源专辑 ℹ️ 关于我们
⭐ 虫虫下载站

📄 m2b4_drv.c

📁 nucleus 文件系统,内核和彩色图形系统,在小系统上非常好用
💻 C
📖 第 1 页 / 共 3 页
字号:
		{	/* for each byte in the row */
			if (*srcPtr & pxBit)
			{	/* source is 1 */
				*dstPtr = (*dstPtr ^ dstPxBit);
			}

			dstPxBit = (dstPxBit >> shfCnt);
			if (dstPxBit == 0)
			{	/* advance to next byte */
				dstPtr++;
				if (shfCnt == 2)
				{
					dstPxBit = 0xc0;
				}
				else
				{
					dstPxBit = 0xf0;
				}

			}

			pxBit = pxBit >> 1;
			if (pxBit == 0)
			{
				pxBit = 128;
				srcPtr++;
			}
		}

		dRect.Ymin++;	/* advance to next row */
		srcPtr += srcNextRow;
	}

	return;
}


/* Function OXADest1M2_4B sets the destination pixel data based on
the logical function "OR", "XOR" or "AND". */
void OXADest1M2_4B(void)
{
	int lclLineCnt, lclByteCnt;
	int pxBit;
	int pxBitVal;
	int pxShift;
	byte dstPxBit;
	int logFnc;

	pxShift =  (dRect.Xmin & firstOffset) * shfCnt;
	lclLineCnt = lineCntM1;
	logFnc = (dstClass & 3);	/* only two lower bits needed */

	pxBitVal = 128 >> (sRect.Xmin & 7);

	while (lclLineCnt-- >= 0)
	{	/* for each row */
		dstPtr = (byte *) (*(dstBmap->mapTable[0] + dRect.Ymin))
			+ dstBgnByte;
		lclByteCnt = byteCntM1;
		pxBit = pxBitVal;
		dstPxBit = (byte) (shiftMask >> pxShift);
		while (lclByteCnt-- >= 0)
		{	/* for each byte in the row */
			if (*srcPtr & pxBit)
			{	/* source is 1 */
				switch (logFnc)
				{
				case 0:	/* handled elsewhere */
				case 1:	/* "OR" */
					*dstPtr = *dstPtr | (dstPxBit & pnColr);
					break;
				case 2:	/* "XOR" */
					*dstPtr = *dstPtr ^ (dstPxBit & pnColr);
					break;
				case 3:	/* "AND" */
					*dstPtr = *dstPtr & (~dstPxBit | (dstPxBit & pnColr));
				}
			}
			else
			{	/* source is 0 */
				switch (logFnc)
				{
				case 0:	/* handled elsewhere */
				case 1:	/* "OR" */
					*dstPtr = *dstPtr | (dstPxBit & bkColr);
					break;
				case 2:	/* "XOR" */
					*dstPtr = *dstPtr ^ (dstPxBit & bkColr);
					break;
				case 3:	/* "AND" */
					*dstPtr = *dstPtr & (~dstPxBit | (dstPxBit & bkColr));
				}
			}

			dstPxBit = (dstPxBit >> shfCnt);
			if (dstPxBit == 0)
			{	/* advance to next byte */
				dstPtr++;
				if (shfCnt == 2)
				{
					dstPxBit = 0xc0;
				}
				else
				{
					dstPxBit = 0xf0;
				}

			}

			pxBit = pxBit >> 1;
			if (pxBit == 0)
			{
				pxBit = 128;
				srcPtr++;
			}
		}

		dRect.Ymin++;	/* advance to next row */
		srcPtr += srcNextRow;
	}

	return;
}


/* Function mwPBSS2_4B is a special case optimization for memory
to memory, rectangular clipping with no color translation. */
void mwPBSS2_4B(blitRcd *blitRec)
{
	int Check_YX_Band_Blit(rect *bandRect, rect *blitRectPtr,
		rect *clipR, int *rectCnt);
	void DrawRectEntryBlitM2_4M(blitRcd *blitRec);
	int Set_Up_Clip(blitRcd *clipBlit, rect *clipR, int blitMayOverlap,
				int isLine);
	int Blit_Clip_Region(blitRcd *fcRec, rect *fillRect, rect *sRect);
	void nuResume(grafMap *srcBmap);
	void RepDestM2_4B(void);
	void OXADestM2_4B(void);
	void SetDestM2_4B(void);
	void NotDestSolidM2_4B(void);
	void InvertDestM2_4B(void);
	void QuickEnd(void);

	rect clipR;	/* Clip rect */
	rect *rListPtr;	/* list pointer */
	int blitMayOverlap = 0;	/* Set false for region clipping*/
	int isLine = 0;	/* Set false */

	rectCnt =  blitRec->blitCnt;
	rListPtr =  (rect *) blitRec->blitList;
	srcBmap =  blitRec->blitSmap;
	srcPixBytes = srcBmap->pixBytes;

	M_PAUSE(srcBmap);	/* pause the source */

	bkColr = (char) blitRec->blitBack;	/* background color */
	pnColr = (char) blitRec->blitFore;	/* foreground color */

	dstBmap =  blitRec->blitDmap;
	dstClass = blitRec->blitRop & 0x0f;

	M_PAUSE(dstBmap);

	dstWidth = dstBmap->pixBytes;
	shfCnt = dstBmap->pixBits;	/* determine number of bits per pixel */
	if (shfCnt == 2)
	{	/* 2 bpp */
		flipMask = 2;
		shiftMask = 0xc0;
		firstOffset = 0x03;
	}
	else
	{	/* 4 bpp */
		flipMask = 1;
		shiftMask = 0xf0;
		firstOffset = 0x01;
	}

	switch (dstClass)
	{	/* look up the optimization routine */
	  			    /* LCD non-transparent */
	case 0:		/* zREPz   :           src			 */
	case 4:		/* zNREPz  :        (NOT src)		 */
		optPtr = &RepDestM2_4B;
		break;
	case 1:		/* zORz    :       src OR  dst		 */
	case 2:		/* zXORz   :       src XOR dst		 */
	case 3:		/* zNANDz  :    (NOT src) AND dst	 */
	case 5:		/* zNORz   :    (NOT src) OR  dst	 */
	case 6:		/* zNXORz  :    (NOT src) XOR dst	 */
	case 7:		/* zANDz   :       src AND dst		 */
		optPtr = &OXADestM2_4B;
		break;
	case 8:		/* zCLEARz :           0's			 */
	case 12:	/* zSETz   :           1's			 */
		optPtr = &SetDestM2_4B;
		break;
	case 9:		/* zORNz   :     src OR  (NOT dst)	 */
	case 11:	/* zANDNz  :     src AND (NOT dst)	 */
	case 13:	/* zNORNz  : (NOT src) OR  (NOT dst) */
	case 15:	/* zNANDNz : (NOT src) AND (NOT dst) */
		optPtr = &NotDestSolidM2_4B;
		break;
	case 10:	/* zNOPz   :           dst <NOP>	 */
		optPtr = &QuickEnd;
		break;
	case 14:	/* zINVERTz:        (NOT dst)		 */
		optPtr = &InvertDestM2_4B;
		break;
	}

	/* modify the pen color as necessary */
	switch (dstClass)
	{
	case 3:	/* zNANDz */
	case 4:	/* zNREPz */
	case 5:	/* zNORz */
	case 6:	/* zNXORz */
	case 13:	/* zNORNz */
	case 15:	/* zNANDNz */
		pnColr = (char)-1;	/* this has the effect of notting the
					pen color for all operations during this call */
	case 0:	/* zREPz */
	case 1:	/* zORz */
	case 2:	/* zXORz */
	case 7:	/* zANDz */
	case 9:	/* zORNz */
	case 10:	/* zNOPz */
	case 11:	/* zANDNz */
		pnColr = 0;
		break;
	case 8:	/* zCLEARz */
		pnColr = 0;	/* sets all source bits to 0 */
		break;
	case 12:	/* zSETz */
	case 14:	/* zINVERTz */
		pnColr = (char)-1;	/* sets all source bits to 1 */
	}

	/* set up clipping */
	if (Set_Up_Clip(blitRec, &clipR, blitMayOverlap, isLine))
		goto PB_RTN;

	while (--rectCnt >= 0 )
	{
		sRect = *rListPtr++;
		dRect = *rListPtr++;
		if (clipToRectFlag != 0)	/* do we need to worry about clipping */
		{	/* yes, do trivial reject */
			if (dRect.Xmin < clipR.Xmin)
			{	/* Reset src & dst Xmin clip limit */
				sRect.Xmin -= (dRect.Xmin - clipR.Xmin);
				dRect.Xmin  = clipR.Xmin;
			}
			if (dRect.Ymin < clipR.Ymin)
			{	/* Reset src & dst Ymin clip limit */
				sRect.Ymin -= (dRect.Ymin - clipR.Ymin);
				dRect.Ymin  = clipR.Ymin;
			}
			if (dRect.Xmax > clipR.Xmax)
			{	/* Reset src & dst Xmax clip limit */
				sRect.Xmax -= (dRect.Xmax - clipR.Xmax);
				dRect.Xmax  = clipR.Xmax;
			}
			if (dRect.Ymax > clipR.Ymax)
			{	/* Reset src & dst Ymax clip limit */
				sRect.Ymax -= (dRect.Ymax - clipR.Ymax);
				dRect.Ymax  = clipR.Ymax;
			}
			
			if (dRect.Ymin >= dRect.Ymax)
			{	/* Check to see whether the rectangle was trivially
				clipped because it was fully below the clip rect,
				in which case we can discard the rest of a YX banded
				blitList, or because it was fully above the clip
				rect, in which case we can whiz ahead through a YX
				banded blitList until we run out of rects or find a
				rect that isn't fully above the clip rect. */
				if (Check_YX_Band_Blit(&dRect, rListPtr, &clipR,
					   &rectCnt)) break;
				continue;
			}
			
			if (dRect.Xmin >= dRect.Xmax) continue;

			/* do we need to worry about region clipping? */
			if (clipToRegionFlag != 0)
			{	/* yes */
				FillDrawer = &DrawRectEntryBlitM2_4M;
				if (Blit_Clip_Region(blitRec, &dRect, &sRect)
					== 0) break;
				continue;
			}
		}
		
		DrawRectEntryBlitM2_4M(blitRec);	/* blit the rectangle */
	}

PB_RTN:
	nuResume(srcBmap);
	nuResume(dstBmap);
	return;
}


/* Function DrawRectEntryBlitM2_4M blits the rectangle to the memory */
void DrawRectEntryBlitM2_4M(blitRcd *blitRec)
{

	lineCntM1 = dRect.Ymax - dRect.Ymin - 1;
	srcBgnByte = (sRect.Xmin >> flipMask);
	dstBgnByte = (dRect.Xmin >> flipMask);
	byteCntM1 = dRect.Xmax - dRect.Xmin - 1;

	optPtr();	/* blit the rectangle */

	return;
}


/* Function NotDestSolidM2_4B handles memory "not dst" by inverting the
destination first. */
void NotDestSolidM2_4B(void)
{
	void InvertDestM2_4B(void);
	void OXADestM2_4B(void);

	InvertDestM2_4B();

	OXADestM2_4B();	/* fill this rectangle */

	return;
}


/* Function RepDestM2_4B sets the destination pixel data with the
source data. */
void RepDestM2_4B(void)
{
	int lclByteCnt, lclShift;
	int dstPxShift, srcPxShift, srcShf;
	byte dstPxBit, srcPxBit, srcColr;

	if ((dstBmap == srcBmap) && ((sRect.Ymin < dRect.Ymin) ||
		((sRect.Ymin == dRect.Ymin) && (sRect.Xmin < dRect.Xmin))))
	{	/* blit bottom to top, right to left */
		dstPxShift = (dRect.Xmax & firstOffset) * shfCnt;
		srcPxShift = (sRect.Xmax & firstOffset) * shfCnt;
		srcShf = srcPxShift - dstPxShift;

/* BobB 1/15/99 - corrected image shifting */
	if (srcShf < 0) srcShf = -srcShf;

		lclShift = (flipMask << 1);

		while (lineCntM1-- >= 0)
		{	/* for each row */
			dstPtr = (byte *) (*(dstBmap->mapTable[0] + dRect.Ymax))
				+ (dRect.Xmax >> flipMask);
			srcPtr = (byte *) (*(srcBmap->mapTable[0] + sRect.Ymax))
				+ (sRect.Xmax >> flipMask);
			lclByteCnt = byteCntM1;
			dstPxBit = (byte) (shiftMask >> dstPxShift);
			srcPxBit = (byte) (shiftMask >> srcPxShift);
			while (lclByteCnt-- >= 0)
			{	/* for each byte in the row */
				srcColr = (*srcPtr ^ pnColr) & srcPxBit;

/* BobB 1/15/99 - corrected image shifting
				if (srcShf < 0) srcColr = (srcColr >> -srcShf);
				if (srcShf > 0) srcColr = (srcColr << srcShf); */
				if (dstPxBit < srcPxBit) srcColr = (srcColr >> srcShf);
				if (dstPxBit > srcPxBit) srcColr = (srcColr << srcShf);

				*dstPtr = (*dstPtr & ~dstPxBit) | srcColr;

				dstPxBit = (dstPxBit << shfCnt);
				if (dstPxBit == 0)
				{	/* advance to next byte */
					dstPtr--;

					/* now check for high speed middle blit */
					if (srcShf == 0)
					{	/* yes */
						while (lclByteCnt >= lclShift)
						{	/* for each byte in the row */
							srcPtr--;
							*dstPtr = pnColr ^ *srcPtr;
							dstPtr--;
							lclByteCnt -= lclShift;
						}
					}

					/* do rest of data */
					if (shfCnt == 2)
					{
						dstPxBit = 0x03;
					}
					else
					{
						dstPxBit = 0x0f;
					}

				}

				srcPxBit = (srcPxBit << shfCnt);
				if (srcPxBit == 0)
				{	/* advance to next byte */
					srcPtr--;
					if (shfCnt == 2)
					{
						srcPxBit = 0x03;
					}
					else
					{
						srcPxBit = 0x0f;
					}

				}

			}

			dRect.Ymax--;	/* advance to next row */
			sRect.Ymax--;
		}
	}
	else
	{	/* blit top to bottom, left to right */
		dstPxShift = (dRect.Xmin & firstOffset) * shfCnt;
		srcPxShift = (sRect.Xmin & firstOffset) * shfCnt;
		srcShf = srcPxShift - dstPxShift;

/* BobB 1/15/99 - corrected image shifting */
	if (srcShf < 0) srcShf = -srcShf;

		lclShift = (flipMask << 1);

		while (lineCntM1-- >= 0)
		{	/* for each row */
			dstPtr = (byte *) (*(dstBmap->mapTable[0] + dRect.Ymin))
				+ dstBgnByte;
			srcPtr = (byte *) (*(srcBmap->mapTable[0] + sRect.Ymin))
				+ srcBgnByte;
			lclByteCnt = byteCntM1;
			dstPxBit = (byte) (shiftMask >> dstPxShift);
			srcPxBit = (byte) (shiftMask >> srcPxShift);
			while (lclByteCnt-- >= 0)
			{	/* for each byte in the row */
				srcColr = (*srcPtr ^ pnColr) & srcPxBit;

/* BobB 1/15/99 - corrected image shifting
				if (srcShf < 0) srcColr = (srcColr >> -srcShf);
				if (srcShf > 0) srcColr = (srcColr << srcShf); */
				if (dstPxBit < srcPxBit) srcColr = (srcColr >> srcShf);
				if (dstPxBit > srcPxBit) srcColr = (srcColr << srcShf);

				*dstPtr = (*dstPtr & ~dstPxBit) | srcColr;

⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -