/* $XFree86: xc/programs/Xserver/hw/xfree86/xaa/xf86dline.c,v 3.11.2.1 1998/02/01 16:42:14 robin 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 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: cfbline.c,v 1.24 94/07/28 14:33:33 dpw Exp $ */ /* $XFree86: xc/programs/Xserver/hw/xfree86/xaa/xf86dline.c,v 3.11.2.1 1998/02/01 16:42:14 robin Exp $ */ /* * Accelerated dashed lines. * Adapted from xf86line.c by Mark Vojkovich (mvojkovi@ucsd.edu). * * The xf86AccelInfoRec.Flags HARDWARE_CLIP_LINE flag indicates that * lines are clipped by the hardware. In that case, SetClippingRectangle * must be defined. * * At the moment, when software clipping is used the Bresenham error term * gets to large, at which point it is scaled. The precision is taken * from xf86AccelInfoRec.ErrorTermBits. */ #include "X.h" #include "Xmd.h" #include "gcstruct.h" #include "windowstr.h" #include "pixmapstr.h" #include "regionstr.h" #include "scrnintstr.h" #include "mistruct.h" /* PSZ doesn't matter. */ #define PSZ 8 #include "cfb.h" #include "miline.h" #include "xf86.h" #include "xf86xaa.h" #include "xf86local.h" #include "xf86Priv.h" int xf86PackDashPattern(GCPtr pGC) { Bool EvenDash = (pGC->numInDashList & 0x01) ? FALSE : TRUE; int PatternLength = 0; unsigned char* DashPtr = (unsigned char*)pGC->dash; int count = pGC->numInDashList; while(count--) PatternLength += *(DashPtr++); if(!EvenDash) PatternLength <<= 1; if(PatternLength > xf86AccelInfoRec.LinePatternMaxLength) return 0; if(xf86AccelInfoRec.Flags & LINE_PATTERN_POWER_OF_2_ONLY) { if(PatternLength & (PatternLength - 1)) return 0; } DashPtr = (unsigned char*)pGC->dash; if(xf86AccelInfoRec.Flags & LINE_PATTERN_MSBFIRST_MSBJUSTIFIED) { register CARD32* PatPtr = (CARD32*)xf86AccelInfoRec.LinePatternBuffer + ((xf86AccelInfoRec.LinePatternMaxLength - 1) >> 5); register unsigned char value; register int bits = 0; Bool set = TRUE; count = (EvenDash) ? PatternLength : (PatternLength >> 1); CONCATENATE: while(count) { value = *(DashPtr++); if(set) { count -= value; while(value--) { *PatPtr = (*PatPtr << 1) | 0x01; if((++bits) & 32) { PatPtr--; bits = 0; } } set = FALSE; } else { count -= value; while(value--) { *PatPtr <<= 1; if((++bits) & 32) { PatPtr--; bits = 0; } } set = TRUE; } } if(!EvenDash) { EvenDash = TRUE; DashPtr = (unsigned char*)pGC->dash; count = PatternLength >> 1; goto CONCATENATE; } if(bits) *PatPtr <<= (32 - bits); } else { /* LINE_PATTERN_MSBFIRST_LSBJUSTIFIED */ register CARD32* PatPtr; register unsigned char value; register int bits; Bool set = TRUE; count = (EvenDash) ? PatternLength : (PatternLength >> 1); PatPtr = (CARD32*)xf86AccelInfoRec.LinePatternBuffer + ((PatternLength - 1) >> 5); bits = (PatternLength - 1) & 31; CONCATENATE_2: while(count) { value = *(DashPtr++); if(set) { count -= value; while(value--) { *PatPtr = (*PatPtr << 1) | 0x01; if(!(bits--)) { PatPtr--; bits = 31; } } set = FALSE; } else { count -= value; while(value--) { *PatPtr <<= 1; if(!(bits--)) { PatPtr--; bits = 31; } } set = TRUE; } } if(!EvenDash) { EvenDash = TRUE; DashPtr = (unsigned char*)pGC->dash; count = PatternLength >> 1; goto CONCATENATE_2; } } return PatternLength; } void #ifdef POLYSEGMENT xf86PolyDashedSegment(pDrawable, pGC, nseg, pSeg) DrawablePtr pDrawable; GCPtr pGC; int nseg; register xSegment *pSeg; #else xf86PolyDashedLine(pDrawable, pGC, mode, npt, pptInit) 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 */ int xorg, yorg; /* origin of window */ int adx; /* abs values of dx and dy */ int ady; int e, e1, e2; /* bresenham error and increments */ int len; /* length of segment */ unsigned int bias = miGetZeroLineBias(pDrawable->pScreen); Bool EvenDash = TRUE; int signdx, signdy, octant; /* a bunch of temporaries */ int tmp; register int y1, y2; register int x1, x2; RegionPtr cclip; cfbPrivGCPtr devPriv; int PatternOffset; int PatternLength; Bool UseTwoPointLine = (xf86AccelInfoRec.Flags & USE_TWO_POINT_LINE); if (((xf86AccelInfoRec.Flags & LINE_PATTERN_ONLY_TRANSPARENCY) && (pGC->lineStyle == LineDoubleDash)) || !(PatternLength = xf86PackDashPattern(pGC))) { #ifdef POLYSEGMENT switch (xf86bpp) { case 8: #ifdef VGA256 vga256SegmentSD(pDrawable, pGC, nseg, pSeg); #else cfbSegmentSD(pDrawable, pGC, nseg, pSeg); #endif break; case 16: cfb16SegmentSD(pDrawable, pGC, nseg, pSeg); break; case 24: cfb24SegmentSD(pDrawable, pGC, nseg, pSeg); break; case 32: cfb32SegmentSD(pDrawable, pGC, nseg, pSeg); break; } #else switch (xf86bpp) { case 8: #ifdef VGA256 vga256SegmentSD(pDrawable, pGC, mode, npt, pptInit); #else cfbLineSD(pDrawable, pGC, mode, npt, pptInit); #endif break; case 16: cfb16LineSD(pDrawable, pGC, mode, npt, pptInit); break; case 24: cfb24LineSD(pDrawable, pGC, mode, npt, pptInit); break; case 32: cfb32LineSD(pDrawable, pGC, mode, npt, pptInit); break; } #endif return; } PatternOffset = pGC->dashOffset % PatternLength; devPriv = cfbGetGCPrivate(pGC); cclip = devPriv->pCompositeClip; pboxInit = REGION_RECTS(cclip); nboxInit = REGION_NUM_RECTS(cclip); xf86AccelInfoRec.SetupForDashedLine(pGC->fgPixel, (pGC->lineStyle == LineDoubleDash) ? pGC->bgPixel : -1, pGC->alu, pGC->planemask, PatternLength); 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 CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy, 1, 1, octant); if(!(adx | ady)) continue; if(!UseTwoPointLine) { if (adx > ady) { e1 = ady << 1; e2 = e1 - (adx << 1); e = e1 - adx; } else { e1 = adx << 1; e2 = e1 - (ady << 1); e = e1 - 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 (UseTwoPointLine) { #ifdef POLYSEGMENT xf86AccelInfoRec.SubsequentDashedTwoPointLine( x1, y1, x2, y2, (bias | pGC->capStyle == CapNotLast ? 0x100 : 0), PatternOffset); #else xf86AccelInfoRec.SubsequentDashedTwoPointLine( x1, y1, x2, y2, bias, PatternOffset); #endif break; } if (!(octant & YMAJOR)) len = adx; else len = ady; #ifdef POLYSEGMENT if (pGC->capStyle != CapNotLast) len++; #endif xf86AccelInfoRec.SubsequentDashedBresenhamLine(x1, y1, octant, e, e1, e2, len, PatternOffset); break; } else if (oc1 & oc2) { pbox++; } else if (xf86AccelInfoRec.Flags & HARDWARE_CLIP_LINE) { xf86AccelInfoRec.SetClippingRectangle( pbox->x1, pbox->y1, pbox->x2 - 1, pbox->y2 - 1); if (UseTwoPointLine) { #ifdef POLYSEGMENT /* * Note: Two-point lines may not support * CapNotLast, in which case I don't think * PolySegment can use TwoPointLine with * CapNotLast set. */ xf86AccelInfoRec.SubsequentDashedTwoPointLine( x1, y1, x2, y2, bias | (pGC->capStyle == CapNotLast ? 0x100 : 0), PatternOffset); #else xf86AccelInfoRec.SubsequentDashedTwoPointLine( x1, y1, x2, y2, bias, PatternOffset); #endif } else { if (!(octant & YMAJOR)) len = adx; else len = ady; #ifdef POLYSEGMENT if (pGC->capStyle != CapNotLast) len++; #endif xf86AccelInfoRec.SubsequentDashedBresenhamLine(x1, y1, octant, e, e1, e2, len, PatternOffset); } 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 we were to support software clipping with * two point lines, we would have to use * CalculateLineDeltas() now. */ 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; } if (!(octant & YMAJOR)) 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) { int offset; /* unwind bresenham error term to first point */ if (clip1) { int range; clipdx = abs(new_x1 - x1); clipdy = abs(new_y1 - y1); /* * XXX This new error term is probably * too big to be handled. */ if (!(octant & YMAJOR)) err = e+((clipdy*e2) + ((clipdx-clipdy)*e1)); else err = e+((clipdx*e2) + ((clipdy-clipdx)*e1)); /* * Rescale the error terms. */ #define nbits xf86AccelInfoRec.ErrorTermBits range = 1 << nbits; if (abs(err) >= range || abs(e1) >= range || abs(e2) >= range) { int div; if (abs(err) > abs(e1)) div = (abs(err) > abs(e2)) ? (abs(err) + range - 1) >> nbits : (abs(e2) + range - 1) >> nbits; else div = (abs(e1) > abs(e2)) ? (abs(e1) + range - 1) >> nbits : (abs(e2) + range - 1) >> nbits; err /= div; e1 /= div; e2 /= div; } } else err = e; if(octant & YMAJOR) offset = abs(new_y1 - y1); else offset = abs(new_x1 - x1); offset += PatternOffset; offset %= PatternLength; xf86AccelInfoRec.SubsequentDashedBresenhamLine( new_x1, new_y1, octant, err, e1, e2, len, offset); } pbox++; } } /* while (nbox--) */ #ifndef POLYSEGMENT PatternOffset += (octant & YMAJOR) ? ady : adx; PatternOffset %= PatternLength; #endif } /* 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->y) || (ppt == pptInit + 1))) { nbox = nboxInit; pbox = pboxInit; while (nbox--) { if ((x2 >= pbox->x1) && (y2 >= pbox->y1) && (x2 < pbox->x2) && (y2 < pbox->y2)) { if(UseTwoPointLine) xf86AccelInfoRec.SubsequentDashedTwoPointLine( x2, y2, x2, y2, 0, PatternOffset); else xf86AccelInfoRec.SubsequentDashedBresenhamLine( x2, y2, YMAJOR, -1, 0, -2, 1, PatternOffset); break; } else pbox++; } } #endif if (xf86AccelInfoRec.Flags & BACKGROUND_OPERATIONS) xf86AccelInfoRec.Sync(); }