/* $XFree86: xc/programs/Xserver/hw/xfree86/accel/mach32/mach32dseg.c,v 3.11 1996/12/23 06:38:28 dawes Exp $ */ /* 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 AND KEVIN E. MARTIN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL OR KEVIN E. MARTIN 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. Modified for the 8514/A by Kevin E. Martin (martin@cs.unc.edu) Modified for the mach32 by Mike Bernson (mike@mbsun.mlb.org) */ /* s3dline.c from s3line.c with help from cfbresd.c and cfbline.c - Jon */ /* $XConsortium: mach32dseg.c /main/7 1996/02/21 17:26:28 kaleb $ */ #include "X.h" #include "gcstruct.h" #include "windowstr.h" #include "pixmapstr.h" #include "regionstr.h" #include "scrnintstr.h" #include "mistruct.h" #include "miline.h" #include "cfb.h" #include "cfb16.h" #include "cfbmskbits.h" #include "misc.h" #include "xf86.h" #include "mach32.h" #define NextDash {\ dashIndexTmp++; \ if (dashIndexTmp == numInDashList) \ dashIndexTmp = 0; \ dashRemaining = pDash[dashIndexTmp]; \ thisDash = dashRemaining; \ } #define FillDashPat {\ \ dashPat = 0; \ if (tmp < len) {\ if (!(dashIndexTmp & 1))\ dashPat |= 0x1e;\ if (--thisDash == 0)\ NextDash\ }\ dashPat <<= 8; \ if (tmp + 1 < len) {\ if (!(dashIndexTmp & 1))\ dashPat |= 0x1e;\ if (--thisDash == 0)\ NextDash\ }\ } /* * Dashed lines through the graphics engine. * Known Bugs: Jon 13/9/93 * - Dash offset isn't caclulated correctly for clipped lines. [fixed?] * - Dash offset isn't updated correctly. [fixed?] * - Dash patters which are a power of 2 and < 16 can be done faster through * the color compare register. * - DoubleDashed lines are are probably very incorrect. * - line caps are possible wrong too. * - Caclulating the dashes could probably be done more optimally, * e.g. We could producing the pattern stipple before hand? */ void mach32Dsegment (pDrawable, pGC, nseg, pSeg) DrawablePtr pDrawable; GCPtr pGC; int nseg; register xSegment *pSeg; { int nboxInit; register int nbox; BoxPtr pboxInit; register BoxPtr pbox; unsigned int oc1; /* outcode of point 1 */ unsigned int oc2; /* outcode of point 2 */ int xorg, yorg; /* origin of window */ int adx; /* abs values of dx and dy */ int ady; int signdx; /* sign of dx and dy */ int signdy; int e, e1, e2; /* bresenham error and increments */ int len; /* length of segment */ int axis; /* major axis */ int octant; unsigned int bias = miGetZeroLineBias(pDrawable->pScreen); short direction; unsigned char *pDash; int dashOffset; int numInDashList; int dashIndex; int dashIndexTmp, dashOffsetTmp, thisDash, dashRemaining; int unclippedlen; short dashPat; /* a bunch of temporaries */ int tmp; register int y1, y2; register int x1, x2; RegionPtr cclip; cfbPrivGCPtr devPriv; short fix; devPriv = (cfbPrivGC *) (pGC->devPrivates[cfbGCPrivateIndex].ptr); cclip = devPriv->pCompositeClip; pboxInit = REGION_RECTS(cclip); nboxInit = REGION_NUM_RECTS(cclip); WaitQueue(7); outw(EXT_SCISSOR_B, pDrawable->pScreen->height-1); outw(FRGD_MIX, FSS_FRGDCOL | mach32alu[pGC->alu]); if (pGC->lineStyle == LineDoubleDash) { outw(BKGD_COLOR, (short)pGC->bgPixel); outw(BKGD_MIX, BSS_BKGDCOL | mach32alu[pGC->alu]); } else outw(BKGD_MIX, BSS_BKGDCOL | MIX_DST); outw(WRT_MASK, (short)pGC->planemask); outw(FRGD_COLOR, (short)pGC->fgPixel); outw (MULTIFUNC_CNTL, PIX_CNTL | MIXSEL_EXPPC | COLCMPOP_F); xorg = pDrawable->x; yorg = pDrawable->y; pDash = (unsigned char *) pGC->dash; numInDashList = pGC->numInDashList; dashIndex = 0; dashOffset = 0; miStepDash ((int)pGC->dashOffset, &dashIndex, pDash, numInDashList, &dashOffset); dashRemaining = pDash[dashIndex] - dashOffset; thisDash = dashRemaining ; while (nseg--) { nbox = nboxInit; pbox = pboxInit; x1 = pSeg->x1 + xorg; y1 = pSeg->y1 + yorg; x2 = pSeg->x2 + xorg; y2 = pSeg->y2 + yorg; pSeg++; { /* sloped line */ direction = 0x0000; if ((adx = x2 - x1) < 0) { fix = 0; } else { direction |= INC_X; fix = -1; } if ((ady = y2 - y1) >= 0) { direction |= INC_Y; } CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy, 1, 1, octant); if (adx > ady) { axis = X_AXIS; e1 = ady << 1; e2 = e1 - (adx << 1); e = e1 - adx; unclippedlen = adx; } else { axis = Y_AXIS; e1 = adx << 1; e2 = e1 - (ady << 1); e = e1 - ady; direction |= YMAJAXIS; unclippedlen = ady; SetYMajorOctant(octant); } FIXUP_ERROR(e, octant, bias); /* * we have bresenham parameters and two points. all we have to do now * is clip and draw. */ while (nbox--) { oc1 = 0; oc2 = 0; OUTCODES(oc1, x1, y1, pbox); OUTCODES(oc2, x2, y2, pbox); if ((oc1 | oc2) == 0) { if (axis == X_AXIS) len = adx; else len = ady; if (pGC->capStyle != CapNotLast) { unclippedlen++; len++; } dashIndexTmp = dashIndex; dashOffsetTmp = dashOffset; /* No need to adjust dash offset */ /* * NOTE: The 8514/A hardware routines for generating lines do * not match the software generated lines of mi, cfb, and mfb. * This is a problem, and if I ever get time, I'll figure out * the 8514/A algorithm and implement it in software for mi, * cfb, and mfb. * 2-sep-93 TCG: apparently only change needed is * addition of 'fix' stuff in cfbline.c */ WaitQueue(7); outw(CUR_X, (short)x1); outw(CUR_Y, (short)y1); outw(ERR_TERM, (short)(e + fix)); outw(DESTY_AXSTP, (short)e1); outw(DESTX_DIASTP, (short)e2); outw(MAJ_AXIS_PCNT, (short)len); outw(CMD, CMD_LINE | DRAW | LASTPIX | direction | PCDATA | _16BIT | WRTDATA); WaitQueue(16); for (tmp = 0 ; tmp < len; tmp+=2) { FillDashPat; outw(PIX_TRANS, dashPat); } break; } else if (oc1 & oc2) { pbox++; } else { /* * let the mi helper routine do our work; better than * duplicating code... */ int err; /* modified bresenham error term */ int clip1=0, clip2=0; /* clippedness of the endpoints */ int clipdx, clipdy; /* difference between clipped and * unclipped start point */ int dlen; int new_x1 = x1, new_y1 = y1, new_x2 = x2, new_y2 = y2; if (miZeroClipLine(pbox->x1, pbox->y1, pbox->x2-1, pbox->y2-1, &new_x1, &new_y1, &new_x2, &new_y2, adx, ady, &clip1, &clip2, octant, bias, oc1, oc2) == -1) { pbox++; continue; } dashIndexTmp = dashIndex; dashOffsetTmp = dashOffset; if (axis == X_AXIS) { dlen = abs(new_x1 - x1); len = abs(new_x2 - new_x1); } else { dlen = abs(new_y1 - y1); len = abs(new_y2 - new_y1); } if (clip2 != 0 || pGC->capStyle != CapNotLast) len++; if (len) { /* unwind bresenham error term to first point */ if (clip1) { clipdx = abs(new_x1 - x1); clipdy = abs(new_y1 - y1); if (axis == X_AXIS) err = e + ((clipdy * e2) + ((clipdx - clipdy) * e1)); else err = e + ((clipdx * e2) + ((clipdy - clipdx) * e1)); } else err = e; /* * Here is a problem, the unwound error terms could be * upto 16bit now. The poor MACH32 is only 12 or 13 bit. * The rounding error is probably small I favor scaling * the error terms, although re-evaluation is also an * option I think it might give visable errors * - Jon 12/9/93. */ if (abs(err) > 4096 || abs(e1) > 4096 || abs(e2) > 4096) { #if 1 int div; if (abs(err) > abs(e1)) div = (abs(err) > abs(e2)) ? (abs(err) + 4095)/ 4096 : (abs(e2) + 4095)/ 4096; else div = (abs(e1) > abs(e2)) ? (abs(e1) + 4095)/ 4096 : (abs(e2) + 4095)/ 4096; err /= div; e1 /= div; e2 /= div; #else int minor; if (axis == X_AXIS) { minor = abs(new_y2 - new_y1); err = 2 * minor - len; } else { minor = abs(new_x2 - new_x1); err = 2 * minor - len - 1; } e1 = minor << 1; e2 = e1 - (len << 1); #endif } miStepDash (dlen, &dashIndexTmp, pDash, numInDashList, &dashOffsetTmp); WaitQueue(7); outw(CUR_X, (short)new_x1); outw(CUR_Y, (short)new_y1); outw(ERR_TERM, (short)(err + fix)); outw(DESTY_AXSTP, (short)e1); outw(DESTX_DIASTP, (short)e2); outw(MAJ_AXIS_PCNT, (short)len); outw(CMD, CMD_LINE | DRAW | LASTPIX | direction | PCDATA | _16BIT | WRTDATA); WaitQueue(16); for (tmp = 0 ; tmp < len; tmp+=2) { FillDashPat; outw(PIX_TRANS, dashPat); } } pbox++; } } /* while (nbox--) */ }/* sloped line */ } /* while (nline--) */ WaitQueue(4); outw(EXT_SCISSOR_B, mach32MaxY); outw(FRGD_MIX, FSS_FRGDCOL | MIX_SRC); outw(BKGD_MIX, BSS_BKGDCOL | MIX_SRC); outw (MULTIFUNC_CNTL, PIX_CNTL | MIXSEL_FRGDMIX | COLCMPOP_F); }