977 lines
22 KiB
C
977 lines
22 KiB
C
/***********************************************************
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Copyright (c) 1987 X Consortium
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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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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X CONSORTIUM 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 X Consortium 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 X Consortium.
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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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/* GJA -- modified this file for vga16 */
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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#include <stdlib.h>
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#include "xf4bpp.h"
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#include "OScompiler.h"
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#include "mfbmap.h"
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#include "mfb.h"
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#include "maskbits.h"
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#include "mi.h"
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#include "miline.h"
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#include "vgaVideo.h"
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#include "wm3.h"
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#include "xf86str.h" /* for pScrn->vtSema */
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extern ScrnInfoPtr *xf86Screens;
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/* single-pixel lines on a color frame buffer
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NON-SLOPED LINES
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horizontal lines are always drawn left to right; we have to
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move the endpoints right by one after they're swapped.
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horizontal lines will be confined to a single band of a
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region. the code finds that band (giving up if the lower
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bound of the band is above the line we're drawing); then it
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finds the first box in that band that contains part of the
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line. we clip the line to subsequent boxes in that band.
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vertical lines are always drawn top to bottom (y-increasing.)
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this requires adding one to the y-coordinate of each endpoint
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after swapping.
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SLOPED LINES
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when clipping a sloped line, we bring the second point inside
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the clipping box, rather than one beyond it, and then add 1 to
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the length of the line before drawing it. this lets us use
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the same box for finding the outcodes for both endpoints. since
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the equation for clipping the second endpoint to an edge gives us
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1 beyond the edge, we then have to move the point towards the
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first point by one step on the major axis.
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eventually, there will be a diagram here to explain what's going
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on. the method uses Cohen-Sutherland outcodes to determine
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outsideness, and a method similar to Pike's layers for doing the
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actual clipping.
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*/
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#ifdef POLYSEGMENT
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static void DoV16SegmentSS(
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DrawablePtr, GCPtr, int, xSegment*
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);
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void
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xf4bppSegmentSS (pDrawable, pGC, nseg, pSeg)
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DrawablePtr pDrawable;
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GCPtr pGC;
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int nseg;
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register xSegment *pSeg;
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{
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if ( ! xf86Screens[pDrawable->pScreen->myNum]->vtSema ) {
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miPolySegment(pDrawable, pGC, nseg, pSeg);
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} else {
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DO_WM3(pGC,DoV16SegmentSS (pDrawable, pGC, nseg, pSeg));
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}
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}
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#else
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static void DoV16LineSS(
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DrawablePtr, GCPtr, int, int, DDXPointPtr
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);
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void
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xf4bppLineSS (pDrawable, pGC, mode, npt, pptInit)
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DrawablePtr pDrawable;
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GCPtr pGC;
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int mode; /* Origin or Previous */
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int npt; /* number of points */
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DDXPointPtr pptInit;
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{
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if ( ! xf86Screens[pDrawable->pScreen->myNum]->vtSema ) {
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miZeroLine(pDrawable, pGC, mode, npt, pptInit);
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} else {
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DO_WM3(pGC,DoV16LineSS (pDrawable, pGC, mode, npt, pptInit));
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}
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}
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#endif
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static void
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#ifdef POLYSEGMENT
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DoV16SegmentSS (pDrawable, pGC, nseg, pSeg)
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DrawablePtr pDrawable;
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GCPtr pGC;
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int nseg;
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register xSegment *pSeg;
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#else
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DoV16LineSS (pDrawable, pGC, mode, npt, pptInit)
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DrawablePtr pDrawable;
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GCPtr pGC;
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int mode; /* Origin or Previous */
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int npt; /* number of points */
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DDXPointPtr pptInit;
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#endif
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{
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int nboxInit;
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register int nbox;
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BoxPtr pboxInit;
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register BoxPtr pbox;
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#ifndef POLYSEGMENT
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register DDXPointPtr ppt; /* pointer to list of translated points */
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#endif
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unsigned int oc1; /* outcode of point 1 */
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unsigned int oc2; /* outcode of point 2 */
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PixelType *addrlBase; /* pointer to start of drawable */
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#ifndef POLYSEGMENT
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PixelType *addrl; /* address of destination pixmap */
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#endif
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int nlwidth; /* width in longwords of destination pixmap */
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int xorg, yorg; /* origin of window */
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int adx; /* abs values of dx and dy */
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int ady;
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int signdx; /* sign of dx and dy */
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int signdy;
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int e, e1, e2; /* bresenham error and increments */
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int len; /* length of segment */
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int axis; /* major axis */
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int octant;
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unsigned int bias = miGetZeroLineBias(pDrawable->pScreen);
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/* a bunch of temporaries */
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register int y1, y2;
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register int x1, x2;
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RegionPtr cclip;
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#ifndef POLYSEGMENT
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int alu = pGC->alu; /* GJA */
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#endif
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if (!(pGC->planemask & 0x0F))
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return;
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cclip = pGC->pCompositeClip;
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pboxInit = REGION_RECTS(cclip);
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nboxInit = REGION_NUM_RECTS(cclip);
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nlwidth = BYTES_PER_LINE(pDrawable) >> 2; /* GJA */
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addrlBase = (PixelType *)VIDBASE(pDrawable); /* GJA */
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xorg = pDrawable->x;
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yorg = pDrawable->y;
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#ifdef POLYSEGMENT
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while (nseg--)
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#else
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ppt = pptInit;
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x2 = ppt->x + xorg;
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y2 = ppt->y + yorg;
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while(--npt)
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#endif
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{
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nbox = nboxInit;
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pbox = pboxInit;
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#ifdef POLYSEGMENT
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x1 = pSeg->x1 + xorg;
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y1 = pSeg->y1 + yorg;
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x2 = pSeg->x2 + xorg;
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y2 = pSeg->y2 + yorg;
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pSeg++;
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#else
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x1 = x2;
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y1 = y2;
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++ppt;
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if (mode == CoordModePrevious)
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{
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xorg = x1;
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yorg = y1;
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}
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x2 = ppt->x + xorg;
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y2 = ppt->y + yorg;
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#endif
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if (x1 == x2) /* vertical line */
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{
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/* make the line go top to bottom of screen, keeping
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endpoint semantics
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*/
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if (y1 > y2)
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{
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register int tmp;
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tmp = y2;
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y2 = y1 + 1;
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y1 = tmp + 1;
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#ifdef POLYSEGMENT
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if (pGC->capStyle != CapNotLast)
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y1--;
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#endif
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}
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#ifdef POLYSEGMENT
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else if (pGC->capStyle != CapNotLast)
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y2++;
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#endif
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/* get to first band that might contain part of line */
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while ((nbox) && (pbox->y2 <= y1))
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{
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pbox++;
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nbox--;
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}
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if (nbox)
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{
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/* stop when lower edge of box is beyond end of line */
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while((nbox) && (y2 >= pbox->y1))
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{
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if ((x1 >= pbox->x1) && (x1 < pbox->x2))
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{
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int y1t, y2t;
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/* this box has part of the line in it */
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y1t = max(y1, pbox->y1);
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y2t = min(y2, pbox->y2);
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if (y1t != y2t)
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{
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xf4bppVertS (addrlBase, nlwidth,
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x1, y1t, y2t-y1t);
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}
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}
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nbox--;
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pbox++;
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}
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}
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#ifndef POLYSEGMENT
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y2 = ppt->y + yorg;
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#endif
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}
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else if (y1 == y2) /* horizontal line */
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{
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/* force line from left to right, keeping
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endpoint semantics
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*/
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if (x1 > x2)
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{
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register int tmp;
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tmp = x2;
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x2 = x1 + 1;
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x1 = tmp + 1;
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#ifdef POLYSEGMENT
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if (pGC->capStyle != CapNotLast)
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x1--;
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#endif
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}
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#ifdef POLYSEGMENT
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else if (pGC->capStyle != CapNotLast)
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x2++;
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#endif
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/* find the correct band */
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while( (nbox) && (pbox->y2 <= y1))
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{
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pbox++;
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nbox--;
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}
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/* try to draw the line, if we haven't gone beyond it */
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if ((nbox) && (pbox->y1 <= y1))
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{
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int tmp;
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/* when we leave this band, we're done */
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tmp = pbox->y1;
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while((nbox) && (pbox->y1 == tmp))
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{
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int x1t, x2t;
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if (pbox->x2 <= x1)
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{
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/* skip boxes until one might contain start point */
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nbox--;
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pbox++;
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continue;
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}
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/* stop if left of box is beyond right of line */
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if (pbox->x1 >= x2)
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{
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nbox = 0;
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break;
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}
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x1t = max(x1, pbox->x1);
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x2t = min(x2, pbox->x2);
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if (x1t != x2t)
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{
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xf4bppHorzS (addrlBase, nlwidth,
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x1t, y1, x2t-x1t);
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}
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nbox--;
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pbox++;
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}
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}
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#ifndef POLYSEGMENT
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x2 = ppt->x + xorg;
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#endif
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}
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else /* sloped line */
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{
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CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy,
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1, 1, octant);
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if (adx > ady)
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{
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axis = X_AXIS;
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e1 = ady << 1;
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e2 = e1 - (adx << 1);
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e = e1 - adx;
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}
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else
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{
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axis = Y_AXIS;
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e1 = adx << 1;
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e2 = e1 - (ady << 1);
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e = e1 - ady;
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SetYMajorOctant(octant);
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}
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FIXUP_ERROR(e, octant, bias);
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/* we have bresenham parameters and two points.
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all we have to do now is clip and draw.
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*/
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while(nbox--)
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{
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oc1 = 0;
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oc2 = 0;
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OUTCODES(oc1, x1, y1, pbox);
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OUTCODES(oc2, x2, y2, pbox);
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if ((oc1 | oc2) == 0)
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{
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if (axis == X_AXIS)
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len = adx;
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else
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len = ady;
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#ifdef POLYSEGMENT
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if (pGC->capStyle != CapNotLast)
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len++;
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#endif
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xf4bppBresS (addrlBase, nlwidth,
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signdx, signdy, axis, x1, y1,
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e, e1, e2, len);
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break;
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}
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else if (oc1 & oc2)
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{
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pbox++;
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}
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else
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{
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int new_x1 = x1, new_y1 = y1, new_x2 = x2, new_y2 = y2;
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int clip1 = 0, clip2 = 0;
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int clipdx, clipdy;
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int err;
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if (miZeroClipLine(pbox->x1, pbox->y1, pbox->x2-1,
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pbox->y2-1,
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&new_x1, &new_y1, &new_x2, &new_y2,
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adx, ady, &clip1, &clip2,
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octant, bias, oc1, oc2) == -1)
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{
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pbox++;
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continue;
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}
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if (axis == X_AXIS)
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len = abs(new_x2 - new_x1);
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else
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len = abs(new_y2 - new_y1);
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#ifdef POLYSEGMENT
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if (clip2 != 0 || pGC->capStyle != CapNotLast)
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len++;
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#else
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len += (clip2 != 0);
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#endif
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if (len)
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{
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/* unwind bresenham error term to first point */
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if (clip1)
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{
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clipdx = abs(new_x1 - x1);
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clipdy = abs(new_y1 - y1);
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if (axis == X_AXIS)
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err = e+((clipdy*e2) + ((clipdx-clipdy)*e1));
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else
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err = e+((clipdx*e2) + ((clipdy-clipdx)*e1));
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}
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else
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err = e;
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xf4bppBresS (addrlBase, nlwidth,
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signdx, signdy, axis, new_x1, new_y1,
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err, e1, e2, len);
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}
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pbox++;
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}
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} /* while (nbox--) */
|
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} /* sloped line */
|
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} /* while (nline--) */
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|
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#ifndef POLYSEGMENT
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|
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/* paint the last point if the end style isn't CapNotLast.
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(Assume that a projecting, butt, or round cap that is one
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pixel wide is the same as the single pixel of the endpoint.)
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*/
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if ((pGC->capStyle != CapNotLast) &&
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((ppt->x + xorg != pptInit->x + pDrawable->x) ||
|
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(ppt->y + yorg != pptInit->y + pDrawable->y) ||
|
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(ppt == pptInit + 1)))
|
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{
|
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PixelType _mask;
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|
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if (alu == RROP_BLACK)
|
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_mask = mfbGetrmask(x2 & PIM);
|
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else
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_mask = mfbGetmask(x2 & PIM);
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|
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nbox = nboxInit;
|
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pbox = pboxInit;
|
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while (nbox--)
|
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{
|
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if ((x2 >= pbox->x1) &&
|
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(y2 >= pbox->y1) &&
|
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(x2 < pbox->x2) &&
|
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(y2 < pbox->y2))
|
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{
|
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addrl = mfbScanline(addrlBase, x2, y2, nlwidth);
|
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UPDRW(addrl,_mask);
|
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break;
|
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}
|
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else
|
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pbox++;
|
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}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Draw dashed 1-pixel lines.
|
|
*/
|
|
|
|
#ifdef POLYSEGMENT
|
|
static void DoV16SegmentSD(
|
|
DrawablePtr, GCPtr, int, xSegment*
|
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);
|
|
|
|
void
|
|
xf4bppSegmentSD (pDrawable, pGC, nseg, pSeg)
|
|
DrawablePtr pDrawable;
|
|
GCPtr pGC;
|
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int nseg;
|
|
register xSegment *pSeg;
|
|
{
|
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if ( ! xf86Screens[pDrawable->pScreen->myNum]->vtSema ) {
|
|
miPolySegment(pDrawable, pGC, nseg, pSeg);
|
|
} else {
|
|
DO_WM3(pGC,DoV16SegmentSD (pDrawable, pGC, nseg, pSeg));
|
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}
|
|
}
|
|
|
|
#else
|
|
static void DoV16LineSD(
|
|
DrawablePtr, GCPtr, int, int, DDXPointPtr
|
|
);
|
|
|
|
void
|
|
xf4bppLineSD (pDrawable, pGC, mode, npt, pptInit)
|
|
DrawablePtr pDrawable;
|
|
GCPtr pGC;
|
|
int mode; /* Origin or Previous */
|
|
int npt; /* number of points */
|
|
DDXPointPtr pptInit;
|
|
{
|
|
if ( ! xf86Screens[pDrawable->pScreen->myNum]->vtSema ) {
|
|
miZeroDashLine(pDrawable, pGC, mode, npt, pptInit);
|
|
} else {
|
|
DO_WM3(pGC,DoV16LineSD (pDrawable, pGC, mode, npt, pptInit));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void
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#ifdef POLYSEGMENT
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DoV16SegmentSD (pDrawable, pGC, nseg, pSeg)
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DrawablePtr pDrawable;
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register GCPtr pGC;
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int nseg;
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register xSegment *pSeg;
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#else
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DoV16LineSD( pDrawable, pGC, mode, npt, pptInit)
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DrawablePtr pDrawable;
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register GCPtr pGC;
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int mode; /* Origin or Previous */
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int npt; /* number of points */
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DDXPointPtr pptInit;
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#endif
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{
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int nboxInit;
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register int nbox;
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BoxPtr pboxInit;
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register BoxPtr pbox;
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#ifndef POLYSEGMENT
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register DDXPointPtr ppt; /* pointer to list of translated points */
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#endif
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register unsigned int oc1; /* outcode of point 1 */
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register unsigned int oc2; /* outcode of point 2 */
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PixelType *addrl; /* address of destination pixmap */
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int nlwidth; /* width in longwords of destination pixmap */
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int xorg, yorg; /* origin of window */
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int adx; /* abs values of dx and dy */
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int ady;
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int signdx; /* sign of dx and dy */
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int signdy;
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int e, e1, e2; /* bresenham error and increments */
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int len; /* length of segment */
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int axis; /* major axis */
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int octant;
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unsigned int bias = miGetZeroLineBias(pDrawable->pScreen);
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int x1, x2, y1, y2;
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RegionPtr cclip;
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int fgink, bgink; /* GJA */
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unsigned char *pDash;
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int dashOffset;
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int numInDashList;
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int dashIndex;
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int isDoubleDash;
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int dashIndexTmp, dashOffsetTmp;
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int unclippedlen;
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if (!(pGC->planemask & 0x0F))
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return;
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cclip = pGC->pCompositeClip;
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fgink = bgink = pGC->fgPixel; /* GJA */
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pboxInit = REGION_RECTS(cclip);
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nboxInit = REGION_NUM_RECTS(cclip);
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nlwidth = BYTES_PER_LINE(pDrawable) >> 2; /* GJA */
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addrl = (PixelType *)VIDBASE(pDrawable); /* GJA */
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/* compute initial dash values */
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pDash = (unsigned char *) pGC->dash;
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numInDashList = pGC->numInDashList;
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isDoubleDash = (pGC->lineStyle == LineDoubleDash);
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dashIndex = 0;
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dashOffset = 0;
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miStepDash ((int)pGC->dashOffset, &dashIndex, pDash,
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numInDashList, &dashOffset);
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if (isDoubleDash)
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bgink = pGC->bgPixel; /* GJA */
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xorg = pDrawable->x;
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yorg = pDrawable->y;
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#ifdef POLYSEGMENT
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while (nseg--)
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#else
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ppt = pptInit;
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x2 = ppt->x + xorg;
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y2 = ppt->y + yorg;
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while(--npt)
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#endif
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{
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nbox = nboxInit;
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pbox = pboxInit;
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#ifdef POLYSEGMENT
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x1 = pSeg->x1 + xorg;
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y1 = pSeg->y1 + yorg;
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x2 = pSeg->x2 + xorg;
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y2 = pSeg->y2 + yorg;
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pSeg++;
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#else
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x1 = x2;
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y1 = y2;
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++ppt;
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if (mode == CoordModePrevious)
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{
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xorg = x1;
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yorg = y1;
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}
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x2 = ppt->x + xorg;
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y2 = ppt->y + yorg;
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#endif
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CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy, 1, 1, octant);
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if (adx > ady)
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{
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axis = X_AXIS;
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e1 = ady << 1;
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e2 = e1 - (adx << 1);
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e = e1 - adx;
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unclippedlen = adx;
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}
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else
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{
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axis = Y_AXIS;
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e1 = adx << 1;
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e2 = e1 - (ady << 1);
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e = e1 - ady;
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unclippedlen = ady;
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SetYMajorOctant(octant);
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}
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FIXUP_ERROR(e, octant, bias);
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/* we have bresenham parameters and two points.
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all we have to do now is clip and draw.
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*/
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while(nbox--)
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{
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oc1 = 0;
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oc2 = 0;
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OUTCODES(oc1, x1, y1, pbox);
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OUTCODES(oc2, x2, y2, pbox);
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if ((oc1 | oc2) == 0)
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{
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#ifdef POLYSEGMENT
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if (pGC->capStyle != CapNotLast)
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unclippedlen++;
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dashIndexTmp = dashIndex;
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dashOffsetTmp = dashOffset;
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xf4bppBresD (pDrawable, fgink, bgink,
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&dashIndexTmp, pDash, numInDashList,
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&dashOffsetTmp, isDoubleDash,
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addrl, nlwidth,
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signdx, signdy, axis, x1, y1,
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e, e1, e2, unclippedlen);
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break;
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#else
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xf4bppBresD (pDrawable, fgink, bgink,
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&dashIndex, pDash, numInDashList,
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&dashOffset, isDoubleDash,
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addrl, nlwidth,
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signdx, signdy, axis, x1, y1,
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e, e1, e2, unclippedlen);
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goto dontStep;
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#endif
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}
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else if (oc1 & oc2)
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{
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pbox++;
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}
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else /* have to clip */
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{
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int new_x1 = x1, new_y1 = y1, new_x2 = x2, new_y2 = y2;
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int clip1 = 0, clip2 = 0;
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int clipdx, clipdy;
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int err;
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if (miZeroClipLine(pbox->x1, pbox->y1, pbox->x2-1, pbox->y2-1,
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&new_x1, &new_y1, &new_x2, &new_y2,
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adx, ady, &clip1, &clip2,
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octant, bias, oc1, oc2) == -1)
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{
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pbox++;
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continue;
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}
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dashIndexTmp = dashIndex;
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dashOffsetTmp = dashOffset;
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if (clip1)
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{
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int dlen;
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if (axis == X_AXIS)
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dlen = abs(new_x1 - x1);
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else
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dlen = abs(new_y1 - y1);
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miStepDash (dlen, &dashIndexTmp, pDash,
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numInDashList, &dashOffsetTmp);
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}
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if (axis == X_AXIS)
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len = abs(new_x2 - new_x1);
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else
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len = abs(new_y2 - new_y1);
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#ifdef POLYSEGMENT
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if (clip2 != 0 || pGC->capStyle != CapNotLast)
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len++;
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#else
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len += (clip2 != 0);
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#endif
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if (len)
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{
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/* unwind bresenham error term to first point */
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if (clip1)
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{
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clipdx = abs(new_x1 - x1);
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clipdy = abs(new_y1 - y1);
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if (axis == X_AXIS)
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err = e+((clipdy*e2) + ((clipdx-clipdy)*e1));
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else
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err = e+((clipdx*e2) + ((clipdy-clipdx)*e1));
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}
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else
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err = e;
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xf4bppBresD (pDrawable, fgink, bgink,
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&dashIndexTmp, pDash, numInDashList,
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&dashOffsetTmp, isDoubleDash,
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addrl, nlwidth,
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signdx, signdy, axis, new_x1, new_y1,
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err, e1, e2, len);
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}
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pbox++;
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}
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} /* while (nbox--) */
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#ifndef POLYSEGMENT
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/*
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* walk the dash list around to the next line
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*/
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miStepDash (unclippedlen, &dashIndex, pDash,
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numInDashList, &dashOffset);
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dontStep: ;
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#endif
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} /* while (nline--) */
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#ifndef POLYSEGMENT
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/* paint the last point if the end style isn't CapNotLast.
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(Assume that a projecting, butt, or round cap that is one
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pixel wide is the same as the single pixel of the endpoint.)
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*/
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if ((pGC->capStyle != CapNotLast) &&
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((dashIndex & 1) == 0 || isDoubleDash) &&
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((ppt->x + xorg != pptInit->x + pDrawable->x) ||
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(ppt->y + yorg != pptInit->y + pDrawable->y) ||
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(ppt == pptInit + 1)))
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{
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nbox = nboxInit;
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pbox = pboxInit;
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while (nbox--)
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{
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if ((x2 >= pbox->x1) &&
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(y2 >= pbox->y1) &&
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(x2 < pbox->x2) &&
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(y2 < pbox->y2))
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{
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unsigned long _mask;
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_mask = mfbGetmask(x2 & PIM);
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addrl = mfbScanline(addrl, x2, y2, nlwidth);
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UPDRW(addrl,_mask);
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break;
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}
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else
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pbox++;
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}
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}
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#endif
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}
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#if 0
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#ifndef POLYSEGMENT
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/*
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the clipping code could be cleaned up some; most of its
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mess derives from originally being inline in the line code,
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then pulled out to make clipping dashes easier.
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*/
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int
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mfbClipLine(pbox, box,
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ppt1Orig, ppt1, ppt2,
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adx, ady, signdx, signdy, axis,
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pclip1, pclip2)
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BoxPtr pbox; /* box to clip to */
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BoxRec box; /* box to do calculations with */
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DDXPointPtr ppt1Orig, ppt1, ppt2;
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int adx, ady;
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int signdx, signdy;
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register int axis;
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int *pclip1, *pclip2;
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{
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DDXPointRec pt1Orig, pt1, pt2;
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register int swapped = 0;
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int clipDone = 0;
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register unsigned int utmp;
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register int oc1, oc2;
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int clip1, clip2;
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pt1Orig = *ppt1Orig;
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pt1 = *ppt1;
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pt2 = *ppt2;
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clip1 = 0;
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clip2 = 0;
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do
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{
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oc1 = 0;
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oc2 = 0;
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OUTCODES(oc1, pt1.x, pt1.y, pbox);
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OUTCODES(oc2, pt2.x, pt2.y, pbox);
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if (oc1 & oc2)
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clipDone = -1;
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else if ((oc1 | oc2) == 0)
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{
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clipDone = 1;
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if (swapped)
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{
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SWAPPT(pt1, pt2);
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SWAPINT(oc1, oc2);
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SWAPINT(clip1, clip2);
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}
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}
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else /* have to clip */
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{
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/* only clip one point at a time */
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if (!oc1)
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{
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SWAPPT(pt1, pt2);
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SWAPINT(oc1, oc2);
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SWAPINT(clip1, clip2);
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swapped = !swapped;
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}
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clip1 |= oc1;
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if (oc1 & OUT_LEFT)
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{
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pt1.x = box.x1;
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utmp = abs(box.x1 - pt1Orig.x);
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utmp *= ady;
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if(axis==X_AXIS)
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{
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pt1.y = pt1Orig.y + SignTimes(signdy, round(utmp, adx));
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}
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else
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{
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utmp <<= 1;
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if (swapped)
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utmp += ady;
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else
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utmp -= ady;
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pt1.y = pt1Orig.y + SignTimes(signdy, ceiling(utmp, 2*adx));
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if (swapped)
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pt1.y -= signdy;
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}
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}
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else if (oc1 & OUT_ABOVE)
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{
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pt1.y = box.y1;
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utmp = abs(box.y1 - pt1Orig.y);
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utmp *= adx;
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if (axis == Y_AXIS)
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{
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pt1.x = pt1Orig.x + SignTimes(signdx, round(utmp, ady));
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}
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else
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{
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utmp <<= 1;
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if (swapped)
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utmp += adx;
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else
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utmp -= adx;
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pt1.x = pt1Orig.x + SignTimes(signdx, ceiling(utmp, 2*ady));
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if (swapped)
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pt1.x -= signdx;
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}
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}
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else if (oc1 & OUT_RIGHT)
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{
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pt1.x = box.x2;
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utmp = abs(pt1Orig.x - box.x2);
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utmp *= ady;
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if (axis == X_AXIS)
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{
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pt1.y = pt1Orig.y + SignTimes(signdy, round(utmp, adx));
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}
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else
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{
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utmp <<= 1;
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if (swapped)
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utmp += ady;
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else
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utmp -= ady;
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pt1.y = pt1Orig.y + SignTimes(signdy, ceiling(utmp, 2*adx));
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if (swapped)
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pt1.y -= signdy;
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}
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}
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else if (oc1 & OUT_BELOW)
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{
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pt1.y = box.y2;
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utmp = abs(pt1Orig.y - box.y2);
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utmp *= adx;
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if (axis == Y_AXIS)
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{
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pt1.x = pt1Orig.x + SignTimes(signdx, round(utmp, ady));
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}
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else
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{
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utmp <<= 1;
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if (swapped)
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utmp += adx;
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else
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utmp -= adx;
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pt1.x = pt1Orig.x + SignTimes(signdx, ceiling(utmp, 2*ady));
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if (swapped)
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pt1.x -= signdx;
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}
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}
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} /* else have to clip */
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} while(!clipDone);
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*ppt1 = pt1;
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*ppt2 = pt2;
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*pclip1 = clip1;
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*pclip2 = clip2;
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return clipDone;
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}
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#endif
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#endif
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