R6.6 is the Xorg base-line
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Kaleb Keithley
204
mfb/mfbbresd.c
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204
mfb/mfbbresd.c
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/***********************************************************
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Copyright 1987, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of Digital not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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/* $Xorg: mfbbresd.c,v 1.4 2001/02/09 02:05:18 xorgcvs Exp $ */
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#include "X.h"
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#include "misc.h"
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#include "mfb.h"
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#include "maskbits.h"
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#include "miline.h"
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/* Dashed bresenham line */
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#define StepDash\
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if (!--dashRemaining) { \
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if (++ dashIndex == numInDashList) \
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dashIndex = 0; \
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dashRemaining = pDash[dashIndex]; \
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rop = fgrop; \
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if (dashIndex & 1) \
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rop = bgrop; \
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}
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void
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mfbBresD(fgrop, bgrop,
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pdashIndex, pDash, numInDashList, pdashOffset, isDoubleDash,
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addrlbase, nlwidth,
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signdx, signdy, axis, x1, y1, e, e1, e2, len)
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int fgrop, bgrop;
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int *pdashIndex; /* current dash */
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unsigned char *pDash; /* dash list */
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int numInDashList; /* total length of dash list */
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int *pdashOffset; /* offset into current dash */
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int isDoubleDash;
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PixelType *addrlbase; /* pointer to base of bitmap */
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int nlwidth; /* width in longwords of bitmap */
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int signdx, signdy; /* signs of directions */
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int axis; /* major axis (Y_AXIS or X_AXIS) */
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int x1, y1; /* initial point */
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register int e; /* error accumulator */
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register int e1; /* bresenham increments */
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int e2;
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int len; /* length of line */
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{
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register int yinc; /* increment to next scanline, in bytes */
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register PixelType *addrl;
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register int e3 = e2-e1;
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register unsigned long bit;
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PixelType leftbit = mask[0]; /* leftmost bit to process in new word */
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PixelType rightbit = mask[PPW-1]; /* rightmost bit to process in new word */
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int dashIndex;
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int dashOffset;
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int dashRemaining;
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int rop;
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dashOffset = *pdashOffset;
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dashIndex = *pdashIndex;
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dashRemaining = pDash[dashIndex] - dashOffset;
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rop = fgrop;
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if (!isDoubleDash)
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bgrop = -1;
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if (dashIndex & 1)
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rop = bgrop;
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/* point to longword containing first point */
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addrl = mfbScanline(addrlbase, x1, y1, nlwidth);
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yinc = signdy * nlwidth;
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e = e-e1; /* to make looping easier */
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bit = mask[x1 & PIM];
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if (axis == X_AXIS)
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{
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if (signdx > 0)
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{
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while(len--)
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{
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if (rop == RROP_BLACK)
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*addrl &= ~bit;
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else if (rop == RROP_WHITE)
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*addrl |= bit;
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else if (rop == RROP_INVERT)
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*addrl ^= bit;
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e += e1;
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if (e >= 0)
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{
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mfbScanlineInc(addrl, yinc);
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e += e3;
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}
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bit = SCRRIGHT(bit,1);
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if (!bit) { bit = leftbit;addrl ++; }
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StepDash
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}
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}
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else
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{
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while(len--)
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{
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if (rop == RROP_BLACK)
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*addrl &= ~bit;
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else if (rop == RROP_WHITE)
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*addrl |= bit;
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else if (rop == RROP_INVERT)
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*addrl ^= bit;
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e += e1;
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if (e >= 0)
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{
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mfbScanlineInc(addrl, yinc);
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e += e3;
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}
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bit = SCRLEFT(bit,1);
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if (!bit) { bit = rightbit;addrl --; }
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StepDash
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}
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}
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} /* if X_AXIS */
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else
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{
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if (signdx > 0)
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{
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while(len--)
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{
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if (rop == RROP_BLACK)
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*addrl &= ~bit;
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else if (rop == RROP_WHITE)
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*addrl |= bit;
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else if (rop == RROP_INVERT)
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*addrl ^= bit;
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e += e1;
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if (e >= 0)
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{
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bit = SCRRIGHT(bit,1);
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if (!bit) { bit = leftbit;addrl ++; }
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e += e3;
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}
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mfbScanlineInc(addrl, yinc);
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StepDash
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}
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}
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else
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{
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while(len--)
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{
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if (rop == RROP_BLACK)
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*addrl &= ~bit;
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else if (rop == RROP_WHITE)
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*addrl |= bit;
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else if (rop == RROP_INVERT)
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*addrl ^= bit;
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e += e1;
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if (e >= 0)
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{
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bit = SCRLEFT(bit,1);
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if (!bit) { bit = rightbit;addrl --; }
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e += e3;
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}
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mfbScanlineInc(addrl, yinc);
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StepDash
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}
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}
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} /* else Y_AXIS */
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*pdashIndex = dashIndex;
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*pdashOffset = pDash[dashIndex] - dashRemaining;
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}
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