--- /dev/null
+/***********************************************************
+
+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: mfbbresd.c,v 1.10 94/04/17 20:28:18 dpw Exp $ */
+#include "X.h"
+#include "misc.h"
+#include "mfb.h"
+#include "maskbits.h"
+#include "miline.h"
+
+/* Dashed bresenham line */
+
+#define StepDash\
+ if (!--dashRemaining) { \
+ if (++ dashIndex == numInDashList) \
+ dashIndex = 0; \
+ dashRemaining = pDash[dashIndex]; \
+ rop = fgrop; \
+ if (dashIndex & 1) \
+ rop = bgrop; \
+ }
+
+void
+mfbBresD(fgrop, bgrop,
+ pdashIndex, pDash, numInDashList, pdashOffset, isDoubleDash,
+ addrlbase, nlwidth,
+ signdx, signdy, axis, x1, y1, e, e1, e2, len)
+int fgrop, bgrop;
+int *pdashIndex; /* current dash */
+unsigned char *pDash; /* dash list */
+int numInDashList; /* total length of dash list */
+int *pdashOffset; /* offset into current dash */
+int isDoubleDash;
+PixelType *addrlbase; /* pointer to base of bitmap */
+int nlwidth; /* width in longwords of bitmap */
+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 */
+{
+ register int yinc; /* increment to next scanline, in bytes */
+ register PixelType *addrl;
+ register int e3 = e2-e1;
+ register unsigned long bit;
+ PixelType leftbit = mask[0]; /* leftmost bit to process in new word */
+ PixelType rightbit = mask[PPW-1]; /* rightmost bit to process in new word */
+ int dashIndex;
+ int dashOffset;
+ int dashRemaining;
+ int rop;
+
+ dashOffset = *pdashOffset;
+ dashIndex = *pdashIndex;
+ dashRemaining = pDash[dashIndex] - dashOffset;
+ rop = fgrop;
+ if (!isDoubleDash)
+ bgrop = -1;
+ if (dashIndex & 1)
+ rop = bgrop;
+
+ /* point to longword containing first point */
+ addrl = mfbScanline(addrlbase, x1, y1, nlwidth);
+ yinc = signdy * nlwidth;
+ e = e-e1; /* to make looping easier */
+ bit = mask[x1 & PIM];
+ if (axis == X_AXIS)
+ {
+ if (signdx > 0)
+ {
+ while(len--)
+ {
+ if (rop == RROP_BLACK)
+ *addrl &= ~bit;
+ else if (rop == RROP_WHITE)
+ *addrl |= bit;
+ else if (rop == RROP_INVERT)
+ *addrl ^= bit;
+ e += e1;
+ if (e >= 0)
+ {
+ mfbScanlineInc(addrl, yinc);
+ e += e3;
+ }
+ bit = SCRRIGHT(bit,1);
+ if (!bit) { bit = leftbit;addrl ++; }
+ StepDash
+ }
+ }
+ else
+ {
+ while(len--)
+ {
+ if (rop == RROP_BLACK)
+ *addrl &= ~bit;
+ else if (rop == RROP_WHITE)
+ *addrl |= bit;
+ else if (rop == RROP_INVERT)
+ *addrl ^= bit;
+ e += e1;
+ if (e >= 0)
+ {
+ mfbScanlineInc(addrl, yinc);
+ e += e3;
+ }
+ bit = SCRLEFT(bit,1);
+ if (!bit) { bit = rightbit;addrl --; }
+ StepDash
+ }
+ }
+ } /* if X_AXIS */
+ else
+ {
+ if (signdx > 0)
+ {
+ while(len--)
+ {
+ if (rop == RROP_BLACK)
+ *addrl &= ~bit;
+ else if (rop == RROP_WHITE)
+ *addrl |= bit;
+ else if (rop == RROP_INVERT)
+ *addrl ^= bit;
+ e += e1;
+ if (e >= 0)
+ {
+ bit = SCRRIGHT(bit,1);
+ if (!bit) { bit = leftbit;addrl ++; }
+ e += e3;
+ }
+ mfbScanlineInc(addrl, yinc);
+ StepDash
+ }
+ }
+ else
+ {
+ while(len--)
+ {
+ if (rop == RROP_BLACK)
+ *addrl &= ~bit;
+ else if (rop == RROP_WHITE)
+ *addrl |= bit;
+ else if (rop == RROP_INVERT)
+ *addrl ^= bit;
+ e += e1;
+ if (e >= 0)
+ {
+ bit = SCRLEFT(bit,1);
+ if (!bit) { bit = rightbit;addrl --; }
+ e += e3;
+ }
+ mfbScanlineInc(addrl, yinc);
+ StepDash
+ }
+ }
+ } /* else Y_AXIS */
+ *pdashIndex = dashIndex;
+ *pdashOffset = pDash[dashIndex] - dashRemaining;
+}
projects / rdpsrv / blobdiff