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+/* $XFree86: xc/programs/Xserver/afb/afbbres.c,v 3.0 1996/08/18 01:45:25 dawes Exp $ */
+/* Combined Purdue/PurduePlus patches, level 2.0, 1/17/89 */
+/***********************************************************
+
+Copyright (c) 1987 X Consortium
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of the X Consortium shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+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
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the name of Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************/
+/* $XConsortium: afbbres.c,v 1.22 94/04/17 20:28:17 dpw Exp $ */
+
+#include "X.h"
+#include "misc.h"
+#include "afb.h"
+#include "maskbits.h"
+#include "miline.h"
+
+/* Solid bresenham line */
+/* NOTES
+ e2 is used less often than e1, so it's not in a register
+*/
+
+void
+afbBresS(addrlbase, nlwidth, sizeDst, depthDst, signdx, signdy, axis, x1, y1,
+ e, e1, e2, len, rrops)
+PixelType *addrlbase; /* pointer to base of bitmap */
+int nlwidth; /* width in longwords of bitmap */
+int sizeDst;
+int depthDst;
+int signdx, signdy; /* signs of directions */
+int axis; /* major axis (Y_AXIS or X_AXIS) */
+int x1, y1; /* initial point */
+register int e; /* error accumulator */
+register int e1; /* bresenham increments */
+int e2;
+int len; /* length of line */
+unsigned char *rrops;
+{
+ register int yinc; /* increment to next scanline, in bytes */
+ register PixelType *addrl; /* bitmask long pointer */
+ register PixelType bit; /* current bit being set/cleared/etc. */
+ PixelType leftbit = mask[0]; /* leftmost bit to process in new word */
+ PixelType rightbit = mask[PPW-1]; /* rightmost bit to process in new word */
+
+ register int e3 = e2-e1;
+ PixelType tmp;
+ int saveE;
+ int saveLen;
+ int d;
+
+ /* point to longword containing first point */
+ yinc = signdy * nlwidth;
+ e = e-e1; /* to make looping easier */
+
+ if (!len)
+ return;
+
+ saveLen = len;
+ saveE = e;
+
+ for (d = 0; d < depthDst; d++) {
+ addrl = afbScanline(addrlbase, x1, y1, nlwidth);
+ addrlbase += sizeDst; /* @@@ NEXT PLANE @@@ */
+ len = saveLen;
+ e = saveE;
+ bit = mask[x1 & PIM];
+
+ switch (rrops[d]) {
+ case RROP_BLACK:
+ if (axis == X_AXIS) {
+ if (signdx > 0) {
+ tmp = *addrl;
+ for (;;) {
+ tmp &= ~bit;
+ if (!--len)
+ break;
+ bit = SCRRIGHT(bit,1);
+ e += e1;
+ if (e >= 0) {
+ *addrl = tmp;
+ afbScanlineInc(addrl, yinc);
+ e += e3;
+ if (!bit) {
+ bit = leftbit;
+ addrl ++;
+ }
+ tmp = *addrl;
+ } else if (!bit) {
+ *addrl = tmp;
+ bit = leftbit;
+ addrl ++;
+ tmp = *addrl;
+ }
+ }
+ *addrl = tmp;
+ } else {
+ tmp = *addrl;
+ for (;;) {
+ tmp &= ~bit;
+ if (!--len)
+ break;
+ e += e1;
+ bit = SCRLEFT(bit,1);
+ if (e >= 0) {
+ *addrl = tmp;
+ afbScanlineInc(addrl, yinc);
+ e += e3;
+ if (!bit) {
+ bit = rightbit;
+ addrl --;
+ }
+ tmp = *addrl;
+ } else if (!bit) {
+ *addrl = tmp;
+ bit = rightbit;
+ addrl --;
+ tmp = *addrl;
+ }
+ }
+ *addrl = tmp;
+ }
+ } /* if X_AXIS */ else {
+ if (signdx > 0) {
+ while(len--) {
+ *addrl &= ~bit;
+ e += e1;
+ if (e >= 0) {
+ bit = SCRRIGHT(bit,1);
+ if (!bit) { bit = leftbit;addrl ++; }
+ e += e3;
+ }
+ afbScanlineInc(addrl, yinc);
+ }
+ } else {
+ while(len--) {
+ *addrl &= ~bit;
+ e += e1;
+ if (e >= 0) {
+ bit = SCRLEFT(bit,1);
+ if (!bit) { bit = rightbit;addrl --; }
+ e += e3;
+ }
+ afbScanlineInc(addrl, yinc);
+ }
+ }
+ } /* else Y_AXIS */
+ break;
+
+ case RROP_WHITE:
+ if (axis == X_AXIS) {
+ if (signdx > 0) {
+ tmp = *addrl;
+ for (;;) {
+ tmp |= bit;
+ if (!--len)
+ break;
+ e += e1;
+ bit = SCRRIGHT(bit,1);
+ if (e >= 0) {
+ *addrl = tmp;
+ afbScanlineInc(addrl, yinc);
+ e += e3;
+ if (!bit) {
+ bit = leftbit;
+ addrl ++;
+ }
+ tmp = *addrl;
+ } else if (!bit) {
+ *addrl = tmp;
+ bit = leftbit;
+ addrl ++;
+ tmp = *addrl;
+ }
+ }
+ *addrl = tmp;
+ } else {
+ tmp = *addrl;
+ for (;;) {
+ tmp |= bit;
+ if (!--len)
+ break;
+ e += e1;
+ bit = SCRLEFT(bit,1);
+ if (e >= 0) {
+ *addrl = tmp;
+ afbScanlineInc(addrl, yinc);
+ e += e3;
+ if (!bit) {
+ bit = rightbit;
+ addrl --;
+ }
+ tmp = *addrl;
+ } else if (!bit) {
+ *addrl = tmp;
+ bit = rightbit;
+ addrl --;
+ tmp = *addrl;
+ }
+ }
+ *addrl = tmp;
+ }
+ } /* if X_AXIS */ else {
+ if (signdx > 0) {
+ while(len--) {
+ *addrl |= bit;
+ e += e1;
+ if (e >= 0) {
+ bit = SCRRIGHT(bit,1);
+ if (!bit) { bit = leftbit;addrl ++; }
+ e += e3;
+ }
+ afbScanlineInc(addrl, yinc);
+ }
+ } else {
+ while(len--) {
+ *addrl |= bit;
+ e += e1;
+ if (e >= 0) {
+ bit = SCRLEFT(bit,1);
+ if (!bit) { bit = rightbit;addrl --; }
+ e += e3;
+ }
+ afbScanlineInc(addrl, yinc);
+ }
+ }
+ } /* else Y_AXIS */
+ break;
+
+ case RROP_INVERT:
+ if (axis == X_AXIS) {
+ if (signdx > 0) {
+ while(len--) {
+ *addrl ^= bit;
+ e += e1;
+ if (e >= 0) {
+ afbScanlineInc(addrl, yinc);
+ e += e3;
+ }
+ bit = SCRRIGHT(bit,1);
+ if (!bit) { bit = leftbit;addrl ++; }
+ }
+ } else {
+ while(len--) {
+ *addrl ^= bit;
+ e += e1;
+ if (e >= 0) {
+ afbScanlineInc(addrl, yinc);
+ e += e3;
+ }
+ bit = SCRLEFT(bit,1);
+ if (!bit) { bit = rightbit;addrl --; }
+ }
+ }
+ } /* if X_AXIS */ else {
+ if (signdx > 0) {
+ while(len--) {
+ *addrl ^= bit;
+ e += e1;
+ if (e >= 0) {
+ bit = SCRRIGHT(bit,1);
+ if (!bit) { bit = leftbit;addrl ++; }
+ e += e3;
+ }
+ afbScanlineInc(addrl, yinc);
+ }
+ } else {
+ while(len--) {
+ *addrl ^= bit;
+ e += e1;
+ if (e >= 0) {
+ bit = SCRLEFT(bit,1);
+ if (!bit) { bit = rightbit; addrl --; }
+ e += e3;
+ }
+ afbScanlineInc(addrl, yinc);
+ }
+ }
+ } /* else Y_AXIS */
+ } /* switch */
+ } /* for (d = ... ) */
+}
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