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134 lines
4.4 KiB
C
134 lines
4.4 KiB
C
/* $NetBSD: pxbresd.c,v 1.2 2008/04/28 20:57:37 martin Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Doran.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/***********************************************************
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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
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and the Massachusetts Institute of Technology, Cambridge, 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 names of Digital or MIT 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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/* from XConsortium: cfbbresd.c,v 1.11 91/12/26 14:32:45 rws Exp */
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#include "px.h"
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#include "miline.h"
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#define BresStep(minor, major) \
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if ((e += e1) >= 0) { \
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e += e3; \
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minor; \
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} \
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major;
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#define Loop() \
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while (thisDash--) { \
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if(axis == Y_AXIS) { \
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BresStep(x1+=signdx,y1+=signdy) \
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} else { \
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BresStep(y1+=signdy,x1+=signdx) \
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} \
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}
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void
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pxBresD(pxScreenPrivPtr sp, pxPacketPtr pp, pxPrivGCPtr gcPriv,
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int *pdashIndex, unsigned char *pDash, int numInDashList,
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int *pdashOffset, int isDoubleDash, int signdx, int signdy,
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int axis, int x1, int y1, int e, int e1, int e2, int len)
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{
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int e3, dashIndex, dashOffset, dashRemaining, thisDash;
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int xstart, ystart;
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dashOffset = *pdashOffset;
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dashIndex = *pdashIndex;
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dashRemaining = pDash[dashIndex] - dashOffset;
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if ((thisDash = dashRemaining) >= len) {
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thisDash = len;
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dashRemaining -= len;
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}
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e3 = e2 - e1;
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e = e - e1; /* to make looping easier */
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PX_TRACE("pxBresD");
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/* point to first point */
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for (;;) {
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len -= thisDash;
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if ((dashIndex & 1) != 0) {
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if (isDoubleDash) {
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xstart = x1;
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ystart = y1;
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Loop()
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pxAddLineC(sp, pp, xstart, ystart, x1, y1,
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gcPriv->bgPixel);
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} else {
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Loop()
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}
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} else {
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xstart = x1;
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ystart = y1;
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Loop()
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pxAddLineC(sp, pp, xstart, ystart, x1, y1,
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gcPriv->fgFill);
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}
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if (!len)
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break;
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dashIndex++;
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if (dashIndex == numInDashList)
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dashIndex = 0;
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dashRemaining = pDash[dashIndex];
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if ((thisDash = dashRemaining) >= len) {
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dashRemaining -= len;
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thisDash = len;
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}
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}
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*pdashIndex = dashIndex;
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*pdashOffset = pDash[dashIndex] - dashRemaining;
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}
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