ilbmhrzvert.c

/* $XFree86$ */
/* Combined Purdue/PurduePlus patches, level 2.0, 1/17/89 */
/***********************************************************

Copyright (c) 1987  X Consortium

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in this Software without prior written authorization from the X Consortium.


Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
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supporting documentation, and that the name of Digital not be
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******************************************************************/
/* $XConsortium: ilbmhrzvert.c,v 1.15 94/04/17 20:28:24 dpw Exp $ */

/* Modified jun 95 by Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
   to use interleaved bitplanes instead of normal bitplanes */

#include "X.h"

#include "gc.h"
#include "window.h"
#include "pixmap.h"
#include "region.h"

#include "ilbm.h"
#include "maskbits.h"

/* horizontal solid line
   abs(len) > 1
*/
ilbmHorzS(pbase, nlwidth, auxDst, depthDst, x1, y1, len, rrops)
PixelType *pbase;		/* pointer to base of bitmap */
register int nlwidth;		/* width in longwords of bitmap */
int auxDst;
int depthDst;
int x1;						/* initial point */
int y1;
int len;				/* length of line */
register unsigned char *rrops;
{
	register PixelType *addrl;
	register PixelType startmask;
	register PixelType endmask;
	register int nlmiddle;
	register int d;
	int saveNLmiddle;

	/* force the line to go left to right
	   but don't draw the last point
	*/
	if (len < 0) {
		x1 += len;
		x1 += 1;
		len = -len;
	}

	/* all bits inside same longword */
	if ( ((x1 & PIM) + len) < PPW) {
		maskpartialbits(x1, len, startmask);

		for (d = 0; d < depthDst; d++) {
			addrl = ilbmScanline(pbase, x1, y1, auxDst);
			pbase += nlwidth;	/* @@@ NEXT PLANE @@@ */

			switch (rrops[d]) {
				case RROP_BLACK:
					*addrl &= ~startmask;
					break;
				case RROP_WHITE:
					*addrl |= startmask;
					break;
				case RROP_INVERT:
					*addrl ^= startmask;
					break;
				case RROP_NOP:
					break;
			} /* switch */
		} /* for (d = ...) */
	} else {
		maskbits(x1, len, startmask, endmask, nlmiddle);
		saveNLmiddle = nlmiddle;

		for (d = 0; d < depthDst; d++) {
			addrl = ilbmScanline(pbase, x1, y1, auxDst);
			pbase += nlwidth;	/* @@@ NEXT PLANE @@@ */
			nlmiddle = saveNLmiddle;

			switch (rrops[d]) {
				case RROP_BLACK:
					if (startmask)
						*addrl++ &= ~startmask;
					Duff (nlmiddle, *addrl++ = 0x0);
					if (endmask)
						*addrl &= ~endmask;
					break;

				case RROP_WHITE:
					if (startmask)
						*addrl++ |= startmask;
					Duff (nlmiddle, *addrl++ = ~0);
					if (endmask)
						*addrl |= endmask;
					break;

				case RROP_INVERT:
					if (startmask)
						*addrl++ ^= startmask;
					Duff (nlmiddle, *addrl++ ^= ~0);
					if (endmask)
						*addrl ^= endmask;
					break;

				case RROP_NOP:
					break;
			} /* switch */
		} /* for (d = ... ) */
	}
}

/* vertical solid line
   this uses do loops because pcc (Ultrix 1.2, bsd 4.2) generates
   better code.  sigh.  we know that len will never be 0 or 1, so
   it's OK to use it.
*/

ilbmVertS(pbase, nlwidth, auxDst, depthDst, x1, y1, len, rrops)
PixelType *pbase;		/* pointer to base of bitmap */
register int nlwidth;		/* width in longwords of bitmap */
int auxDst;
int depthDst;
int x1, y1;				/* initial point */
register int len;		/* length of line */
unsigned char *rrops;
{
	register PixelType *addrl;
	register PixelType bitmask;
	int saveLen;
	int d;

	if (len < 0) {
		auxDst = -auxDst;
		len = -len;
	}

	saveLen = len;

	for (d = 0; d < depthDst; d++) {
		addrl = ilbmScanline(pbase, x1, y1, auxDst);
		pbase += nlwidth;	/* @@@ NEXT PLANE @@@ */
		len = saveLen;

		switch (rrops[d]) {
			case RROP_BLACK:
				bitmask = rmask[x1 & PIM];
				Duff(len, *addrl &= bitmask; ilbmScanlineInc(addrl, auxDst) );
				break;

			case RROP_WHITE:
				bitmask = mask[x1 & PIM];
				Duff(len, *addrl |= bitmask; ilbmScanlineInc(addrl, auxDst) );
				break;

			case RROP_INVERT:
				bitmask = mask[x1 & PIM];
				Duff(len, *addrl ^= bitmask; ilbmScanlineInc(addrl, auxDst) );
				break;

			case RROP_NOP:
				break;
		} /* switch */
	} /* for (d = ...) */
}