xorg-server-1.4/afb/afbbresd.c

   1 /***********************************************************
   2
   3 Copyright (c) 1987  X Consortium
   4
   5 Permission is hereby granted, free of charge, to any person obtaining a copy
   6 of this software and associated documentation files (the "Software"), to deal
   7 in the Software without restriction, including without limitation the rights
   8 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9 copies of the Software, and to permit persons to whom the Software is
  10 furnished to do so, subject to the following conditions:
  11
  12 The above copyright notice and this permission notice shall be included in
  13 all copies or substantial portions of the Software.
  14
  15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  18 X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  19 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  20 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  21
  22 Except as contained in this notice, the name of the X Consortium shall not be
  23 used in advertising or otherwise to promote the sale, use or other dealings
  24 in this Software without prior written authorization from the X Consortium.
  25
  26
  27 Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
  28
  29                         All Rights Reserved
  30
  31 Permission to use, copy, modify, and distribute this software and its
  32 documentation for any purpose and without fee is hereby granted,
  33 provided that the above copyright notice appear in all copies and that
  34 both that copyright notice and this permission notice appear in
  35 supporting documentation, and that the name of Digital not be
  36 used in advertising or publicity pertaining to distribution of the
  37 software without specific, written prior permission.
  38
  39 DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  40 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
  41 DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
  42 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  43 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  44 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  45 SOFTWARE.
  46
  47 ******************************************************************/
  48
  49 #ifdef HAVE_DIX_CONFIG_H
  50 #include <dix-config.h>
  51 #endif
  52
  53 #include <X11/X.h>
  54 #include "misc.h"
  55 #include "afb.h"
  56 #include "maskbits.h"
  57 #include "miline.h"
  58
  59 /* Dashed bresenham line */
  60
  61 #define StepDash\
  62         if (!--dashRemaining) { \
  63                 if (++ dashIndex == numInDashList) \
  64                         dashIndex = 0; \
  65                 dashRemaining = pDash[dashIndex]; \
  66                 rop = fgrop; \
  67                 if (dashIndex & 1) \
  68                         rop = bgrop; \
  69         }
  70
  71 void
  72 afbBresD(pdashIndex, pDash, numInDashList, pdashOffset, isDoubleDash,
  73                  addrlbase, nlwidth, sizeDst, depthDst,
  74                  signdx, signdy, axis, x1, y1, e, e1, e2, len, rrops, bgrrops)
  75 int *pdashIndex;                /* current dash */
  76 unsigned char *pDash;           /* dash list */
  77 int numInDashList;              /* total length of dash list */
  78 int *pdashOffset;               /* offset into current dash */
  79 int isDoubleDash;
  80 PixelType *addrlbase;           /* pointer to base of bitmap */
  81 int nlwidth;                            /* width in longwords of bitmap */
  82 int sizeDst;
  83 int depthDst;
  84 int signdx, signdy;             /* signs of directions */
  85 int axis;                               /* major axis (Y_AXIS or X_AXIS) */
  86 int x1, y1;                             /* initial point */
  87 register int e;                         /* error accumulator */
  88 register int e1;                /* bresenham increments */
  89 int e2;
  90 int len;                                /* length of line */
  91 unsigned char *rrops;
  92 unsigned char *bgrrops;
  93 {
  94         register int yinc;              /* increment to next scanline, in bytes */
  95         register PixelType *addrl;
  96         register int e3 = e2-e1;
  97         register unsigned long bit;
  98         PixelType leftbit = mfbGetmask(0); /* leftmost bit to process in new word */
  99         PixelType rightbit = mfbGetmask(PPW-1); /* rightmost bit to process in new word */
 100         int dashIndex;
 101         int dashOffset;
 102         int dashRemaining;
 103         int             rop;
 104         int fgrop;
 105         int bgrop;
 106         int saveE;
 107         int saveLen;
 108         int d;
 109
 110         dashOffset = *pdashOffset;
 111         dashIndex = *pdashIndex;
 112         dashRemaining = pDash[dashIndex] - dashOffset;
 113         /* point to longword containing first point */
 114
 115         yinc = signdy * nlwidth;
 116         e = e-e1;                                               /* to make looping easier */
 117
 118         saveE = e;
 119         saveLen = len;
 120
 121         for (d = 0; d < depthDst; d++) {
 122                 addrl = afbScanline(addrlbase, x1, y1, nlwidth);
 123                 addrlbase += sizeDst;   /* @@@ NEXT PLANE @@@ */
 124
 125                 fgrop = rrops[d];
 126                 bgrop = bgrrops[d];
 127
 128                 e = saveE;
 129                 len = saveLen;
 130                 bit = mfbGetmask(x1 & PIM);
 131
 132                 rop = fgrop;
 133                 if (!isDoubleDash)
 134                         bgrop = -1;
 135                 if (dashIndex & 1)
 136                         rop = bgrop;
 137
 138                 if (axis == X_AXIS) {
 139                         if (signdx > 0) {
 140                                 while(len--) {
 141                                         if (rop == RROP_BLACK)
 142                                                 *addrl &= ~bit;
 143                                         else if (rop == RROP_WHITE)
 144                                                 *addrl |= bit;
 145                                         else if (rop == RROP_INVERT)
 146                                                 *addrl ^= bit;
 147                                         e += e1;
 148                                         if (e >= 0) {
 149                                                 afbScanlineInc(addrl, yinc);
 150                                                 e += e3;
 151                                         }
 152                                         bit = SCRRIGHT(bit,1);
 153                                         if (!bit) { bit = leftbit;addrl ++; }
 154                                         StepDash
 155                                 }
 156                         } else {
 157                                 while(len--) {
 158                                         if (rop == RROP_BLACK)
 159                                                 *addrl &= ~bit;
 160                                         else if (rop == RROP_WHITE)
 161                                                 *addrl |= bit;
 162                                         else if (rop == RROP_INVERT)
 163                                                 *addrl ^= bit;
 164                                         e += e1;
 165                                         if (e >= 0) {
 166                                                 afbScanlineInc(addrl, yinc);
 167                                                 e += e3;
 168                                         }
 169                                         bit = SCRLEFT(bit,1);
 170                                         if (!bit) { bit = rightbit;addrl --; }
 171                                         StepDash
 172                                 }
 173                         }
 174                 } /* if X_AXIS */ else {
 175                         if (signdx > 0) {
 176                                 while(len--) {
 177                                         if (rop == RROP_BLACK)
 178                                                 *addrl &= ~bit;
 179                                         else if (rop == RROP_WHITE)
 180                                                 *addrl |= bit;
 181                                         else if (rop == RROP_INVERT)
 182                                                 *addrl ^= bit;
 183                                         e += e1;
 184                                         if (e >= 0) {
 185                                                 bit = SCRRIGHT(bit,1);
 186                                                 if (!bit) { bit = leftbit;addrl ++; }
 187                                                 e += e3;
 188                                         }
 189                                         afbScanlineInc(addrl, yinc);
 190                                         StepDash
 191                                 }
 192                         } else {
 193                                 while(len--) {
 194                                         if (rop == RROP_BLACK)
 195                                                 *addrl &= ~bit;
 196                                         else if (rop == RROP_WHITE)
 197                                                 *addrl |= bit;
 198                                         else if (rop == RROP_INVERT)
 199                                                 *addrl ^= bit;
 200                                         e += e1;
 201                                         if (e >= 0) {
 202                                                 bit = SCRLEFT(bit,1);
 203                                                 if (!bit) { bit = rightbit;addrl --; }
 204                                                 e += e3;
 205                                         }
 206                                         afbScanlineInc(addrl, yinc);
 207                                         StepDash
 208                                 }
 209                         }
 210                 } /* else Y_AXIS */
 211         } /* for (d = ...) */
 212         *pdashIndex = dashIndex;
 213         *pdashOffset = pDash[dashIndex] - dashRemaining;
 214 }