/*********************************************************** Copyright (c) 1987 X Consortium Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of the X Consortium shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from the X Consortium. Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Digital not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ******************************************************************/ /* $XConsortium: vgaline.c,v 1.1.1.3 95/01/13 20:20:59 kaleb Exp $ */ /* $XFree86: xc/programs/Xserver/hw/xfree86/vga256/vga/vgaline.c,v 3.3 1995/01/28 16:14:36 dawes Exp $ */ #include "vga256.h" #include "miline.h" #include "xf86.h" extern Bool vgaUseLinearAddressing; extern pointer vgaLinearBase; void #ifdef POLYSEGMENT #ifdef SPEEDUP speedupvga256SegmentSS (pDrawable, pGC, nseg, pSeg) #else vga256SegmentSS (pDrawable, pGC, nseg, pSeg) #endif DrawablePtr pDrawable; GCPtr pGC; int nseg; register xSegment *pSeg; #else #ifdef SPEEDUP speedupvga256LineSS (pDrawable, pGC, mode, npt, pptInit) #else vga256LineSS (pDrawable, pGC, mode, npt, pptInit) #endif DrawablePtr pDrawable; GCPtr pGC; int mode; /* Origin or Previous */ int npt; /* number of points */ DDXPointPtr pptInit; #endif { int nboxInit; register int nbox; BoxPtr pboxInit; register BoxPtr pbox; #ifndef POLYSEGMENT register DDXPointPtr ppt; /* pointer to list of translated points */ #endif unsigned int oc1; /* outcode of point 1 */ unsigned int oc2; /* outcode of point 2 */ unsigned long *addrl; /* address of destination pixmap */ int nlwidth; /* width in longwords of destination pixmap */ 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 */ /* a bunch of temporaries */ int tmp; register int y1, y2; register int x1, x2; RegionPtr cclip; cfbPrivGCPtr devPriv; unsigned long xor, and; int alu; /* * The following check does NOT work when writing to the * virtualized screen when VT-switched away. * The current inconsistent behaviour is to use cfb for off-screen * pixmaps, the fastvga256 routines for on-screen lines, and the * fastvga256 routines also for the off-screen pixmap of the * virtualized screen when VT-switched away. * If SPEEDUP is defined, which would apply to ET4000, the speedup * routines are always used. */ #ifndef SPEEDUP if( pDrawable->type != DRAWABLE_WINDOW ) { #ifdef POLYSEGMENT cfbSegmentSS(pDrawable, pGC, nseg, pSeg); #else cfbLineSS(pDrawable, pGC, mode, npt, pptInit); #endif return; } #endif devPriv = cfbGetGCPrivate(pGC); cclip = devPriv->pCompositeClip; pboxInit = REGION_RECTS(cclip); nboxInit = REGION_NUM_RECTS(cclip); cfbGetLongWidthAndPointer (pDrawable, nlwidth, addrl) /* * This is a temporary hack to really use the non-bankchecking routines * in the fXF86 functions if linear addressing is enabled. */ if (vgaUseLinearAddressing && xf86VTSema) (unsigned char *)addrl = (unsigned char *)vgaLinearBase + (unsigned int)((unsigned char *)addrl - (unsigned int)VGABASE); BANK_FLAG(addrl) alu = devPriv->rop; xor = devPriv->xor; and = devPriv->and; xorg = pDrawable->x; yorg = pDrawable->y; #ifdef POLYSEGMENT while (nseg--) #else ppt = pptInit; x2 = ppt->x + xorg; y2 = ppt->y + yorg; while(--npt) #endif { nbox = nboxInit; pbox = pboxInit; #ifdef POLYSEGMENT x1 = pSeg->x1 + xorg; y1 = pSeg->y1 + yorg; x2 = pSeg->x2 + xorg; y2 = pSeg->y2 + yorg; pSeg++; #else x1 = x2; y1 = y2; ++ppt; if (mode == CoordModePrevious) { xorg = x1; yorg = y1; } x2 = ppt->x + xorg; y2 = ppt->y + yorg; #endif if (x1 == x2) { /* make the line go top to bottom of screen, keeping endpoint semantics */ if (y1 > y2) { register int tmp; tmp = y2; y2 = y1 + 1; y1 = tmp + 1; #ifdef POLYSEGMENT if (pGC->capStyle != CapNotLast) y1--; #endif } #ifdef POLYSEGMENT else if (pGC->capStyle != CapNotLast) y2++; #endif /* get to first band that might contain part of line */ while ((nbox) && (pbox->y2 <= y1)) { pbox++; nbox--; } if (nbox) { /* stop when lower edge of box is beyond end of line */ while((nbox) && (y2 >= pbox->y1)) { if ((x1 >= pbox->x1) && (x1 < pbox->x2)) { int y1t; /* this box has part of the line in it */ y1t = max(y1, pbox->y1); len = min(y2, pbox->y2) - y1t; #ifdef SPEEDUP if (alu == GXcopy) SpeedUpVLine((unsigned char*)(addrl+y1t*nlwidth) + x1, xor, len, nlwidth << 2); else #endif if (len != 0) { fastvga256VertS (alu, and, xor, addrl, nlwidth, x1, y1t, len); } } nbox--; pbox++; } } #ifndef POLYSEGMENT y2 = ppt->y + yorg; #endif } else if (y1 == y2) { /* force line from left to right, keeping endpoint semantics */ if (x1 > x2) { register int tmp; tmp = x2; x2 = x1 + 1; x1 = tmp + 1; #ifdef POLYSEGMENT if (pGC->capStyle != CapNotLast) x1--; #endif } #ifdef POLYSEGMENT else if (pGC->capStyle != CapNotLast) x2++; #endif /* find the correct band */ while( (nbox) && (pbox->y2 <= y1)) { pbox++; nbox--; } /* try to draw the line, if we haven't gone beyond it */ if ((nbox) && (pbox->y1 <= y1)) { /* when we leave this band, we're done */ tmp = pbox->y1; while((nbox) && (pbox->y1 == tmp)) { int x1t; if (pbox->x2 <= x1) { /* skip boxes until one might contain start point */ nbox--; pbox++; continue; } /* stop if left of box is beyond right of line */ if (pbox->x1 >= x2) { nbox = 0; break; } x1t = max(x1, pbox->x1); len = min(x2, pbox->x2) - x1t; #ifdef SPEEDUP if (alu == GXcopy) SpeedUpHLine((unsigned char*)(addrl+y1*nlwidth) + x1t, xor, len, nlwidth << 2); else #endif if (len != 0) { fastvga256HorzS (alu, and, xor, addrl, nlwidth, x1t, y1, len); } nbox--; pbox++; } } #ifndef POLYSEGMENT x2 = ppt->x + xorg; #endif } else /* sloped line */ { signdx = 1; if ((adx = x2 - x1) < 0) { adx = -adx; signdx = -1; } signdy = 1; if ((ady = y2 - y1) < 0) { ady = -ady; signdy = -1; } if (adx > ady) { axis = X_AXIS; e1 = ady << 1; e2 = e1 - (adx << 1); e = e1 - adx; FIXUP_X_MAJOR_ERROR(e, signdx, signdy); } else { axis = Y_AXIS; e1 = adx << 1; e2 = e1 - (ady << 1); e = e1 - ady; FIXUP_Y_MAJOR_ERROR(e, signdx, signdy); } /* 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; #ifdef POLYSEGMENT if (pGC->capStyle != CapNotLast) len++; #endif #ifdef SPEEDUP SpeedUpBresS (alu, and, xor, addrl, nlwidth, signdx, signdy, axis, x1, y1, e, e1, e2, len); #else fastvga256BresS (alu, and, xor, addrl, nlwidth, signdx, signdy, axis, x1, y1, e, e1, e2, len); #endif break; } else if (oc1 & oc2) { pbox++; } else { int new_x1 = x1, new_y1 = y1, new_x2 = x2, new_y2 = y2; int clip1 = 0, clip2 = 0; int clipdx, clipdy; int err; if (miZeroClipLine (pbox->x1, pbox->y1, pbox->x2-1, pbox->y2-1, &new_x1, &new_y1, &new_x2, &new_y2, adx, ady, &clip1, &clip2, axis, (signdx == signdy), oc1, oc2) == -1) { pbox++; continue; } if (axis == X_AXIS) len = abs(new_x2 - new_x1); else len = abs(new_y2 - new_y1); #ifdef POLYSEGMENT if (clip2 != 0 || pGC->capStyle != CapNotLast) len++; #else len += (clip2 != 0); #endif 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; #ifdef SPEEDUP SpeedUpBresS (alu, and, xor, addrl, nlwidth, signdx, signdy, axis, new_x1, new_y1, err, e1, e2, len); #else fastvga256BresS (alu, and, xor, addrl, nlwidth, signdx, signdy, axis, new_x1, new_y1, err, e1, e2, len); #endif } pbox++; } } /* while (nbox--) */ } /* sloped line */ } /* while (nline--) */ #ifndef POLYSEGMENT /* paint the last point if the end style isn't CapNotLast. (Assume that a projecting, butt, or round cap that is one pixel wide is the same as the single pixel of the endpoint.) */ if ((pGC->capStyle != CapNotLast) && ((ppt->x + xorg != pptInit->x + pDrawable->x) || (ppt->y + yorg != pptInit->y + pDrawable->x) || (ppt == pptInit + 1))) { nbox = nboxInit; pbox = pboxInit; while (nbox--) { if ((x2 >= pbox->x1) && (y2 >= pbox->y1) && (x2 < pbox->x2) && (y2 < pbox->y2)) { unsigned long *addrb; /* address of destination pixmap */ unsigned long mask; unsigned long scrbits; mask = cfbmask[x2 & PIM]; addrl += (y2 * nlwidth) + (x2 >> PWSH); addrb = addrl; SETRW(addrb); scrbits = *addrb; *addrb = (scrbits & ~mask) | (DoRRop (scrbits, and, xor) & mask); break; } else pbox++; } } #endif }