xorg-server-1.4/afb/afbbres.c

   1 /* Combined Purdue/PurduePlus patches, level 2.0, 1/17/89 */
   2 /***********************************************************
   3
   4 Copyright (c) 1987  X Consortium
   5
   6 Permission is hereby granted, free of charge, to any person obtaining a copy
   7 of this software and associated documentation files (the "Software"), to deal
   8 in the Software without restriction, including without limitation the rights
   9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 copies of the Software, and to permit persons to whom the Software is
  11 furnished to do so, subject to the following conditions:
  12
  13 The above copyright notice and this permission notice shall be included in
  14 all copies or substantial portions of the Software.
  15
  16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  19 X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23 Except as contained in this notice, the name of the X Consortium shall not be
  24 used in advertising or otherwise to promote the sale, use or other dealings
  25 in this Software without prior written authorization from the X Consortium.
  26
  27
  28 Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
  29
  30                         All Rights Reserved
  31
  32 Permission to use, copy, modify, and distribute this software and its
  33 documentation for any purpose and without fee is hereby granted,
  34 provided that the above copyright notice appear in all copies and that
  35 both that copyright notice and this permission notice appear in
  36 supporting documentation, and that the name of Digital not be
  37 used in advertising or publicity pertaining to distribution of the
  38 software without specific, written prior permission.
  39
  40 DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  41 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
  42 DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
  43 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  44 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  45 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  46 SOFTWARE.
  47
  48 ******************************************************************/
  49
  50 #ifdef HAVE_DIX_CONFIG_H
  51 #include <dix-config.h>
  52 #endif
  53
  54 #include <X11/X.h>
  55 #include "misc.h"
  56 #include "afb.h"
  57 #include "maskbits.h"
  58 #include "miline.h"
  59
  60 /* Solid bresenham line */
  61 /* NOTES
  62    e2 is used less often than e1, so it's not in a register
  63 */
  64
  65 void
  66 afbBresS(addrlbase, nlwidth, sizeDst, depthDst, signdx, signdy, axis, x1, y1,
  67                  e, e1, e2, len, rrops)
  68 PixelType *addrlbase;           /* pointer to base of bitmap */
  69 int nlwidth;                            /* width in longwords of bitmap */
  70 int sizeDst;
  71 int depthDst;
  72 int signdx, signdy;             /* signs of directions */
  73 int axis;                               /* major axis (Y_AXIS or X_AXIS) */
  74 int x1, y1;                             /* initial point */
  75 register int e;                         /* error accumulator */
  76 register int e1;                /* bresenham increments */
  77 int e2;
  78 int len;                                /* length of line */
  79 unsigned char *rrops;
  80 {
  81         register int yinc;              /* increment to next scanline, in bytes */
  82         register PixelType *addrl;              /* bitmask long pointer */
  83         register PixelType bit;         /* current bit being set/cleared/etc.  */
  84         PixelType leftbit = mfbGetmask(0); /* leftmost bit to process in new word */
  85         PixelType rightbit = mfbGetmask(PPW-1); /* rightmost bit to process in new word */
  86
  87         register int e3 = e2-e1;
  88         PixelType               tmp;
  89         int saveE;
  90         int saveLen;
  91         int d;
  92
  93         /* point to longword containing first point */
  94         yinc = signdy * nlwidth;
  95         e = e-e1;                                               /* to make looping easier */
  96
  97         if (!len)
  98                 return;
  99
 100         saveLen = len;
 101         saveE = e;
 102
 103         for (d = 0; d < depthDst; d++) {
 104                 addrl = afbScanline(addrlbase, x1, y1, nlwidth);
 105                 addrlbase += sizeDst;   /* @@@ NEXT PLANE @@@ */
 106                 len = saveLen;
 107                 e = saveE;
 108                 bit = mfbGetmask(x1 & PIM);
 109
 110                 switch (rrops[d]) {
 111                         case RROP_BLACK:
 112                                 if (axis == X_AXIS) {
 113                                         if (signdx > 0) {
 114                                                 tmp = *addrl;
 115                                                 for (;;) {
 116                                                         tmp &= ~bit;
 117                                                         if (!--len)
 118                                                                 break;
 119                                                         bit = SCRRIGHT(bit,1);
 120                                                         e += e1;
 121                                                         if (e >= 0) {
 122                                                                 *addrl = tmp;
 123                                                                 afbScanlineInc(addrl, yinc);
 124                                                                 e += e3;
 125                                                                 if (!bit) {
 126                                                                         bit = leftbit;
 127                                                                         addrl ++;
 128                                                                 }
 129                                                                 tmp = *addrl;
 130                                                         } else if (!bit) {
 131                                                                 *addrl = tmp;
 132                                                                 bit = leftbit;
 133                                                                 addrl ++;
 134                                                                 tmp = *addrl;
 135                                                         }
 136                                                 }
 137                                                 *addrl = tmp;
 138                                         } else {
 139                                                 tmp = *addrl;
 140                                                 for (;;) {
 141                                                         tmp &= ~bit;
 142                                                         if (!--len)
 143                                                                 break;
 144                                                         e += e1;
 145                                                         bit = SCRLEFT(bit,1);
 146                                                         if (e >= 0) {
 147                                                                 *addrl = tmp;
 148                                                                 afbScanlineInc(addrl, yinc);
 149                                                                 e += e3;
 150                                                                 if (!bit) {
 151                                                                         bit = rightbit;
 152                                                                         addrl --;
 153                                                                 }
 154                                                                 tmp = *addrl;
 155                                                         } else if (!bit) {
 156                                                                 *addrl = tmp;
 157                                                                 bit = rightbit;
 158                                                                 addrl --;
 159                                                                 tmp = *addrl;
 160                                                         }
 161                                                 }
 162                                                 *addrl = tmp;
 163                                         }
 164                                 } /* if X_AXIS */ else {
 165                                         if (signdx > 0) {
 166                                                 while(len--) {
 167                                                         *addrl &= ~bit;
 168                                                         e += e1;
 169                                                         if (e >= 0) {
 170                                                                 bit = SCRRIGHT(bit,1);
 171                                                                 if (!bit) { bit = leftbit;addrl ++; }
 172                                                                 e += e3;
 173                                                         }
 174                                                         afbScanlineInc(addrl, yinc);
 175                                                 }
 176                                         } else {
 177                                                 while(len--) {
 178                                                         *addrl &= ~bit;
 179                                                         e += e1;
 180                                                         if (e >= 0) {
 181                                                                 bit = SCRLEFT(bit,1);
 182                                                                 if (!bit) { bit = rightbit;addrl --; }
 183                                                                 e += e3;
 184                                                         }
 185                                                         afbScanlineInc(addrl, yinc);
 186                                                 }
 187                                         }
 188                                 } /* else Y_AXIS */
 189                                 break;
 190
 191                         case RROP_WHITE:
 192                                 if (axis == X_AXIS) {
 193                                         if (signdx > 0) {
 194                                                 tmp = *addrl;
 195                                                 for (;;) {
 196                                                         tmp |= bit;
 197                                                         if (!--len)
 198                                                                 break;
 199                                                         e += e1;
 200                                                         bit = SCRRIGHT(bit,1);
 201                                                         if (e >= 0) {
 202                                                                 *addrl = tmp;
 203                                                                 afbScanlineInc(addrl, yinc);
 204                                                                 e += e3;
 205                                                                 if (!bit) {
 206                                                                         bit = leftbit;
 207                                                                         addrl ++;
 208                                                                 }
 209                                                                 tmp = *addrl;
 210                                                         } else if (!bit) {
 211                                                                 *addrl = tmp;
 212                                                                 bit = leftbit;
 213                                                                 addrl ++;
 214                                                                 tmp = *addrl;
 215                                                         }
 216                                                 }
 217                                                 *addrl = tmp;
 218                                         } else {
 219                                                 tmp = *addrl;
 220                                                 for (;;) {
 221                                                         tmp |= bit;
 222                                                         if (!--len)
 223                                                                 break;
 224                                                         e += e1;
 225                                                         bit = SCRLEFT(bit,1);
 226                                                         if (e >= 0) {
 227                                                                 *addrl = tmp;
 228                                                                 afbScanlineInc(addrl, yinc);
 229                                                                 e += e3;
 230                                                                 if (!bit) {
 231                                                                         bit = rightbit;
 232                                                                         addrl --;
 233                                                                 }
 234                                                                 tmp = *addrl;
 235                                                         } else if (!bit) {
 236                                                                 *addrl = tmp;
 237                                                                 bit = rightbit;
 238                                                                 addrl --;
 239                                                                 tmp = *addrl;
 240                                                         }
 241                                                 }
 242                                                 *addrl = tmp;
 243                                         }
 244                                 } /* if X_AXIS */ else {
 245                                         if (signdx > 0) {
 246                                                 while(len--) {
 247                                                         *addrl |= bit;
 248                                                         e += e1;
 249                                                         if (e >= 0) {
 250                                                                 bit = SCRRIGHT(bit,1);
 251                                                                 if (!bit) { bit = leftbit;addrl ++; }
 252                                                                 e += e3;
 253                                                         }
 254                                                         afbScanlineInc(addrl, yinc);
 255                                                 }
 256                                         } else {
 257                                                 while(len--) {
 258                                                         *addrl |= bit;
 259                                                         e += e1;
 260                                                         if (e >= 0) {
 261                                                                 bit = SCRLEFT(bit,1);
 262                                                                 if (!bit) { bit = rightbit;addrl --; }
 263                                                                 e += e3;
 264                                                         }
 265                                                         afbScanlineInc(addrl, yinc);
 266                                                 }
 267                                         }
 268                                 } /* else Y_AXIS */
 269                                 break;
 270
 271                         case RROP_INVERT:
 272                                 if (axis == X_AXIS) {
 273                                         if (signdx > 0) {
 274                                                 while(len--) {
 275                                                         *addrl ^= bit;
 276                                                         e += e1;
 277                                                         if (e >= 0) {
 278                                                                 afbScanlineInc(addrl, yinc);
 279                                                                 e += e3;
 280                                                         }
 281                                                         bit = SCRRIGHT(bit,1);
 282                                                         if (!bit) { bit = leftbit;addrl ++; }
 283                                                 }
 284                                         } else {
 285                                                 while(len--) {
 286                                                         *addrl ^= bit;
 287                                                         e += e1;
 288                                                         if (e >= 0) {
 289                                                                 afbScanlineInc(addrl, yinc);
 290                                                                 e += e3;
 291                                                         }
 292                                                         bit = SCRLEFT(bit,1);
 293                                                         if (!bit) { bit = rightbit;addrl --; }
 294                                                 }
 295                                         }
 296                                 } /* if X_AXIS */ else {
 297                                         if (signdx > 0) {
 298                                                 while(len--) {
 299                                                         *addrl ^= bit;
 300                                                         e += e1;
 301                                                         if (e >= 0) {
 302                                                                 bit = SCRRIGHT(bit,1);
 303                                                                 if (!bit) { bit = leftbit;addrl ++; }
 304                                                                 e += e3;
 305                                                         }
 306                                                         afbScanlineInc(addrl, yinc);
 307                                                 }
 308                                         } else {
 309                                                 while(len--) {
 310                                                         *addrl ^= bit;
 311                                                         e += e1;
 312                                                         if (e >= 0) {
 313                                                                 bit = SCRLEFT(bit,1);
 314                                                                 if (!bit) { bit = rightbit; addrl --; }
 315                                                                 e += e3;
 316                                                         }
 317                                                         afbScanlineInc(addrl, yinc);
 318                                                 }
 319                                         }
 320                                 } /* else Y_AXIS */
 321                 } /* switch */
 322         } /* for (d = ... ) */
 323 }