16/sod8086/wl_scale.c

   1 // WL_SCALE.C\r
   2 \r
   3 #include "WL_DEF.H"\r
   4 #pragma hdrstop\r
   5 \r
   6 #define OP_RETF 0xcb\r
   7 \r
   8 /*\r
   9 =============================================================================\r
  10 \r
  11                                                   GLOBALS\r
  12 \r
  13 =============================================================================\r
  14 */\r
  15 \r
  16 t_compscale _seg *scaledirectory[MAXSCALEHEIGHT+1];\r
  17 long                    fullscalefarcall[MAXSCALEHEIGHT+1];\r
  18 \r
  19 int                     maxscale,maxscaleshl2;\r
  20 \r
  21 boolean insetupscaling;\r
  22 \r
  23 /*\r
  24 =============================================================================\r
  25 \r
  26                                                   LOCALS\r
  27 \r
  28 =============================================================================\r
  29 */\r
  30 \r
  31 t_compscale     _seg *work;\r
  32 unsigned BuildCompScale (int height, memptr *finalspot);\r
  33 \r
  34 int                     stepbytwo;\r
  35 \r
  36 //===========================================================================\r
  37 \r
  38 /*\r
  39 ==============\r
  40 =\r
  41 = BadScale\r
  42 =\r
  43 ==============\r
  44 */\r
  45 \r
  46 void far BadScale (void)\r
  47 {\r
  48         Quit ("BadScale called!");\r
  49 }\r
  50 \r
  51 \r
  52 /*\r
  53 ==========================\r
  54 =\r
  55 = SetupScaling\r
  56 =\r
  57 ==========================\r
  58 */\r
  59 \r
  60 void SetupScaling (int maxscaleheight)\r
  61 {\r
  62         int             i,x,y;\r
  63         byte    far *dest;\r
  64 \r
  65         insetupscaling = true;\r
  66 \r
  67         maxscaleheight/=2;                      // one scaler every two pixels\r
  68 \r
  69         maxscale = maxscaleheight-1;\r
  70         maxscaleshl2 = maxscale<<2;\r
  71 \r
  72 //\r
  73 // free up old scalers\r
  74 //\r
  75         for (i=1;i<MAXSCALEHEIGHT;i++)\r
  76         {\r
  77                 if (scaledirectory[i])\r
  78                         MM_FreePtr (&(memptr)scaledirectory[i]);\r
  79                 if (i>=stepbytwo)\r
  80                         i += 2;\r
  81         }\r
  82         memset (scaledirectory,0,sizeof(scaledirectory));\r
  83 \r
  84         MM_SortMem ();\r
  85 \r
  86 //\r
  87 // build the compiled scalers\r
  88 //\r
  89         stepbytwo = viewheight/2;       // save space by double stepping\r
  90         MM_GetPtr (&(memptr)work,20000);\r
  91 \r
  92         for (i=1;i<=maxscaleheight;i++)\r
  93         {\r
  94                 BuildCompScale (i*2,&(memptr)scaledirectory[i]);\r
  95                 if (i>=stepbytwo)\r
  96                         i+= 2;\r
  97         }\r
  98         MM_FreePtr (&(memptr)work);\r
  99 \r
 100 //\r
 101 // compact memory and lock down scalers\r
 102 //\r
 103         MM_SortMem ();\r
 104         for (i=1;i<=maxscaleheight;i++)\r
 105         {\r
 106                 MM_SetLock (&(memptr)scaledirectory[i],true);\r
 107                 fullscalefarcall[i] = (unsigned)scaledirectory[i];\r
 108                 fullscalefarcall[i] <<=16;\r
 109                 fullscalefarcall[i] += scaledirectory[i]->codeofs[0];\r
 110                 if (i>=stepbytwo)\r
 111                 {\r
 112                         scaledirectory[i+1] = scaledirectory[i];\r
 113                         fullscalefarcall[i+1] = fullscalefarcall[i];\r
 114                         scaledirectory[i+2] = scaledirectory[i];\r
 115                         fullscalefarcall[i+2] = fullscalefarcall[i];\r
 116                         i+=2;\r
 117                 }\r
 118         }\r
 119         scaledirectory[0] = scaledirectory[1];\r
 120         fullscalefarcall[0] = fullscalefarcall[1];\r
 121 \r
 122 //\r
 123 // check for oversize wall drawing\r
 124 //\r
 125         for (i=maxscaleheight;i<MAXSCALEHEIGHT;i++)\r
 126                 fullscalefarcall[i] = (long)BadScale;\r
 127 \r
 128         insetupscaling = false;\r
 129 }\r
 130 \r
 131 //===========================================================================\r
 132 \r
 133 /*\r
 134 ========================\r
 135 =\r
 136 = BuildCompScale\r
 137 =\r
 138 = Builds a compiled scaler object that will scale a 64 tall object to\r
 139 = the given height (centered vertically on the screen)\r
 140 =\r
 141 = height should be even\r
 142 =\r
 143 = Call with\r
 144 = ---------\r
 145 = DS:SI         Source for scale\r
 146 = ES:DI         Dest for scale\r
 147 =\r
 148 = Calling the compiled scaler only destroys AL\r
 149 =\r
 150 ========================\r
 151 */\r
 152 \r
 153 unsigned BuildCompScale (int height, memptr *finalspot)\r
 154 {\r
 155         byte            far *code;\r
 156 \r
 157         int                     i;\r
 158         long            fix,step;\r
 159         unsigned        src,totalscaled,totalsize;\r
 160         int                     startpix,endpix,toppix;\r
 161 \r
 162 \r
 163         step = ((long)height<<16) / 64;\r
 164         code = &work->code[0];\r
 165         toppix = (viewheight-height)/2;\r
 166         fix = 0;\r
 167 \r
 168         for (src=0;src<=64;src++)\r
 169         {\r
 170                 startpix = fix>>16;\r
 171                 fix += step;\r
 172                 endpix = fix>>16;\r
 173 \r
 174                 if (endpix>startpix)\r
 175                         work->width[src] = endpix-startpix;\r
 176                 else\r
 177                         work->width[src] = 0;\r
 178 \r
 179 //\r
 180 // mark the start of the code\r
 181 //\r
 182                 work->codeofs[src] = FP_OFF(code);\r
 183 \r
 184 //\r
 185 // compile some code if the source pixel generates any screen pixels\r
 186 //\r
 187                 startpix+=toppix;\r
 188                 endpix+=toppix;\r
 189 \r
 190                 if (startpix == endpix || endpix < 0 || startpix >= viewheight || src == 64)\r
 191                         continue;\r
 192 \r
 193         //\r
 194         // mov al,[si+src]\r
 195         //\r
 196                 *code++ = 0x8a;\r
 197                 *code++ = 0x44;\r
 198                 *code++ = src;\r
 199 \r
 200                 for (;startpix<endpix;startpix++)\r
 201                 {\r
 202                         if (startpix >= viewheight)\r
 203                                 break;                                          // off the bottom of the view area\r
 204                         if (startpix < 0)\r
 205                                 continue;                                       // not into the view area\r
 206 \r
 207                 //\r
 208                 // mov [es:di+heightofs],al\r
 209                 //\r
 210                         *code++ = 0x26;\r
 211                         *code++ = 0x88;\r
 212                         *code++ = 0x85;\r
 213                         *((unsigned far *)code)++ = startpix*SCREENBWIDE;\r
 214                 }\r
 215 \r
 216         }\r
 217 \r
 218 //\r
 219 // retf\r
 220 //\r
 221         *code++ = 0xcb;\r
 222 \r
 223         totalsize = FP_OFF(code);\r
 224         MM_GetPtr (finalspot,totalsize);\r
 225         _fmemcpy ((byte _seg *)(*finalspot),(byte _seg *)work,totalsize);\r
 226 \r
 227         return totalsize;\r
 228 }\r
 229 \r
 230 \r
 231 /*\r
 232 =======================\r
 233 =\r
 234 = ScaleLine\r
 235 =\r
 236 = linescale should have the high word set to the segment of the scaler\r
 237 =\r
 238 =======================\r
 239 */\r
 240 \r
 241 extern  int                     slinex,slinewidth;\r
 242 extern  unsigned        far *linecmds;\r
 243 extern  long            linescale;\r
 244 extern  unsigned        maskword;\r
 245 \r
 246 byte    mask1,mask2,mask3;\r
 247 \r
 248 \r
 249 void near ScaleLine (void)\r
 250 {\r
 251 asm     mov     cx,WORD PTR [linescale+2]\r
 252 asm     mov     es,cx                                           // segment of scaler\r
 253 \r
 254 asm     mov bp,WORD PTR [linecmds]\r
 255 asm     mov     dx,SC_INDEX+1                           // to set SC_MAPMASK\r
 256 \r
 257 asm     mov     bx,[slinex]\r
 258 asm     mov     di,bx\r
 259 asm     shr     di,1                                            // X in bytes\r
 260 asm     shr     di,1\r
 261 asm     add     di,[bufferofs]\r
 262 asm     and     bx,3\r
 263 /* begin 8086 hack\r
 264 asm     shl     bx,3\r
 265 */\r
 266 asm push cx\r
 267 asm mov cl,3\r
 268 asm shl bx,cl\r
 269 asm pop cx\r
 270 /* end 8086 hack */\r
 271 asm     add     bx,[slinewidth]                         // bx = (pixel*8+pixwidth)\r
 272 asm     mov     al,BYTE [mapmasks3-1+bx]        // -1 because pixwidth of 1 is first\r
 273 asm     mov     ds,WORD PTR [linecmds+2]\r
 274 asm     or      al,al\r
 275 asm     jz      notthreebyte                            // scale across three bytes\r
 276 asm     jmp     threebyte\r
 277 notthreebyte:\r
 278 asm     mov     al,BYTE PTR ss:[mapmasks2-1+bx] // -1 because pixwidth of 1 is first\r
 279 asm     or      al,al\r
 280 asm     jnz     twobyte                                         // scale across two bytes\r
 281 \r
 282 //\r
 283 // one byte scaling\r
 284 //\r
 285 asm     mov     al,BYTE PTR ss:[mapmasks1-1+bx] // -1 because pixwidth of 1 is first\r
 286 asm     out     dx,al                                           // set map mask register\r
 287 \r
 288 scalesingle:\r
 289 \r
 290 asm     mov     bx,[ds:bp]                                      // table location of rtl to patch\r
 291 asm     or      bx,bx\r
 292 asm     jz      linedone                                        // 0 signals end of segment list\r
 293 asm     mov     bx,[es:bx]\r
 294 asm     mov     dl,[es:bx]                                      // save old value\r
 295 asm     mov     BYTE PTR es:[bx],OP_RETF        // patch a RETF in\r
 296 asm     mov     si,[ds:bp+4]                            // table location of entry spot\r
 297 asm     mov     ax,[es:si]\r
 298 asm     mov     WORD PTR ss:[linescale],ax      // call here to start scaling\r
 299 asm     mov     si,[ds:bp+2]                            // corrected top of shape for this segment\r
 300 asm     add     bp,6                                            // next segment list\r
 301 \r
 302 asm     mov     ax,SCREENSEG\r
 303 asm     mov     es,ax\r
 304 asm     call ss:[linescale]                             // scale the segment of pixels\r
 305 \r
 306 asm     mov     es,cx                                           // segment of scaler\r
 307 asm     mov     BYTE PTR es:[bx],dl                     // unpatch the RETF\r
 308 asm     jmp     scalesingle                                     // do the next segment\r
 309 \r
 310 \r
 311 //\r
 312 // done\r
 313 //\r
 314 linedone:\r
 315 asm     mov     ax,ss\r
 316 asm     mov     ds,ax\r
 317 return;\r
 318 \r
 319 //\r
 320 // two byte scaling\r
 321 //\r
 322 twobyte:\r
 323 asm     mov     ss:[mask2],al\r
 324 asm     mov     al,BYTE PTR ss:[mapmasks1-1+bx] // -1 because pixwidth of 1 is first\r
 325 asm     mov     ss:[mask1],al\r
 326 \r
 327 scaledouble:\r
 328 \r
 329 asm     mov     bx,[ds:bp]                                      // table location of rtl to patch\r
 330 asm     or      bx,bx\r
 331 asm     jz      linedone                                        // 0 signals end of segment list\r
 332 asm     mov     bx,[es:bx]\r
 333 asm     mov     cl,[es:bx]                                      // save old value\r
 334 asm     mov     BYTE PTR es:[bx],OP_RETF        // patch a RETF in\r
 335 asm     mov     si,[ds:bp+4]                            // table location of entry spot\r
 336 asm     mov     ax,[es:si]\r
 337 asm     mov     WORD PTR ss:[linescale],ax      // call here to start scaling\r
 338 asm     mov     si,[ds:bp+2]                            // corrected top of shape for this segment\r
 339 asm     add     bp,6                                            // next segment list\r
 340 \r
 341 asm     mov     ax,SCREENSEG\r
 342 asm     mov     es,ax\r
 343 asm     mov     al,ss:[mask1]\r
 344 asm     out     dx,al                                           // set map mask register\r
 345 asm     call ss:[linescale]                             // scale the segment of pixels\r
 346 asm     inc     di\r
 347 asm     mov     al,ss:[mask2]\r
 348 asm     out     dx,al                                           // set map mask register\r
 349 asm     call ss:[linescale]                             // scale the segment of pixels\r
 350 asm     dec     di\r
 351 \r
 352 asm     mov     es,WORD PTR ss:[linescale+2] // segment of scaler\r
 353 asm     mov     BYTE PTR es:[bx],cl                     // unpatch the RETF\r
 354 asm     jmp     scaledouble                                     // do the next segment\r
 355 \r
 356 \r
 357 //\r
 358 // three byte scaling\r
 359 //\r
 360 threebyte:\r
 361 asm     mov     ss:[mask3],al\r
 362 asm     mov     al,BYTE PTR ss:[mapmasks2-1+bx] // -1 because pixwidth of 1 is first\r
 363 asm     mov     ss:[mask2],al\r
 364 asm     mov     al,BYTE PTR ss:[mapmasks1-1+bx] // -1 because pixwidth of 1 is first\r
 365 asm     mov     ss:[mask1],al\r
 366 \r
 367 scaletriple:\r
 368 \r
 369 asm     mov     bx,[ds:bp]                                      // table location of rtl to patch\r
 370 asm     or      bx,bx\r
 371 asm     jz      linedone                                        // 0 signals end of segment list\r
 372 asm     mov     bx,[es:bx]\r
 373 asm     mov     cl,[es:bx]                                      // save old value\r
 374 asm     mov     BYTE PTR es:[bx],OP_RETF        // patch a RETF in\r
 375 asm     mov     si,[ds:bp+4]                            // table location of entry spot\r
 376 asm     mov     ax,[es:si]\r
 377 asm     mov     WORD PTR ss:[linescale],ax      // call here to start scaling\r
 378 asm     mov     si,[ds:bp+2]                            // corrected top of shape for this segment\r
 379 asm     add     bp,6                                            // next segment list\r
 380 \r
 381 asm     mov     ax,SCREENSEG\r
 382 asm     mov     es,ax\r
 383 asm     mov     al,ss:[mask1]\r
 384 asm     out     dx,al                                           // set map mask register\r
 385 asm     call ss:[linescale]                             // scale the segment of pixels\r
 386 asm     inc     di\r
 387 asm     mov     al,ss:[mask2]\r
 388 asm     out     dx,al                                           // set map mask register\r
 389 asm     call ss:[linescale]                             // scale the segment of pixels\r
 390 asm     inc     di\r
 391 asm     mov     al,ss:[mask3]\r
 392 asm     out     dx,al                                           // set map mask register\r
 393 asm     call ss:[linescale]                             // scale the segment of pixels\r
 394 asm     dec     di\r
 395 asm     dec     di\r
 396 \r
 397 asm     mov     es,WORD PTR ss:[linescale+2] // segment of scaler\r
 398 asm     mov     BYTE PTR es:[bx],cl                     // unpatch the RETF\r
 399 asm     jmp     scaletriple                                     // do the next segment\r
 400 \r
 401 \r
 402 }\r
 403 \r
 404 \r
 405 /*\r
 406 =======================\r
 407 =\r
 408 = ScaleShape\r
 409 =\r
 410 = Draws a compiled shape at [scale] pixels high\r
 411 =\r
 412 = each vertical line of the shape has a pointer to segment data:\r
 413 =       end of segment pixel*2 (0 terminates line) used to patch rtl in scaler\r
 414 =       top of virtual line with segment in proper place\r
 415 =       start of segment pixel*2, used to jsl into compiled scaler\r
 416 =       <repeat>\r
 417 =\r
 418 = Setup for call\r
 419 = --------------\r
 420 = GC_MODE                       read mode 1, write mode 2\r
 421 = GC_COLORDONTCARE  set to 0, so all reads from video memory return 0xff\r
 422 = GC_INDEX                      pointing at GC_BITMASK\r
 423 =\r
 424 =======================\r
 425 */\r
 426 \r
 427 static  long            longtemp;\r
 428 \r
 429 void ScaleShape (int xcenter, int shapenum, unsigned height)\r
 430 {\r
 431         t_compshape     _seg *shape;\r
 432         t_compscale _seg *comptable;\r
 433         unsigned        scale,srcx,stopx,tempx;\r
 434         int                     t;\r
 435         unsigned        far *cmdptr;\r
 436         boolean         leftvis,rightvis;\r
 437 \r
 438 \r
 439         shape = PM_GetSpritePage (shapenum);\r
 440 \r
 441         scale = height>>3;                                              // low three bits are fractional\r
 442         if (!scale || scale>maxscale)\r
 443                 return;                                                         // too close or far away\r
 444         comptable = scaledirectory[scale];\r
 445 \r
 446         *(((unsigned *)&linescale)+1)=(unsigned)comptable;      // seg of far call\r
 447         *(((unsigned *)&linecmds)+1)=(unsigned)shape;           // seg of shape\r
 448 \r
 449 //\r
 450 // scale to the left (from pixel 31 to shape->leftpix)\r
 451 //\r
 452         srcx = 32;\r
 453         slinex = xcenter;\r
 454         stopx = shape->leftpix;\r
 455         cmdptr = &shape->dataofs[31-stopx];\r
 456 \r
 457         while ( --srcx >=stopx && slinex>0)\r
 458         {\r
 459                 (unsigned)linecmds = *cmdptr--;\r
 460                 if ( !(slinewidth = comptable->width[srcx]) )\r
 461                         continue;\r
 462 \r
 463                 if (slinewidth == 1)\r
 464                 {\r
 465                         slinex--;\r
 466                         if (slinex<viewwidth)\r
 467                         {\r
 468                                 if (wallheight[slinex] >= height)\r
 469                                         continue;               // obscured by closer wall\r
 470                                 ScaleLine ();\r
 471                         }\r
 472                         continue;\r
 473                 }\r
 474 \r
 475                 //\r
 476                 // handle multi pixel lines\r
 477                 //\r
 478                 if (slinex>viewwidth)\r
 479                 {\r
 480                         slinex -= slinewidth;\r
 481                         slinewidth = viewwidth-slinex;\r
 482                         if (slinewidth<1)\r
 483                                 continue;               // still off the right side\r
 484                 }\r
 485                 else\r
 486                 {\r
 487                         if (slinewidth>slinex)\r
 488                                 slinewidth = slinex;\r
 489                         slinex -= slinewidth;\r
 490                 }\r
 491 \r
 492 \r
 493                 leftvis = (wallheight[slinex] < height);\r
 494                 rightvis = (wallheight[slinex+slinewidth-1] < height);\r
 495 \r
 496                 if (leftvis)\r
 497                 {\r
 498                         if (rightvis)\r
 499                                 ScaleLine ();\r
 500                         else\r
 501                         {\r
 502                                 while (wallheight[slinex+slinewidth-1] >= height)\r
 503                                         slinewidth--;\r
 504                                 ScaleLine ();\r
 505                         }\r
 506                 }\r
 507                 else\r
 508                 {\r
 509                         if (!rightvis)\r
 510                                 continue;               // totally obscured\r
 511 \r
 512                         while (wallheight[slinex] >= height)\r
 513                         {\r
 514                                 slinex++;\r
 515                                 slinewidth--;\r
 516                         }\r
 517                         ScaleLine ();\r
 518                         break;                  // the rest of the shape is gone\r
 519                 }\r
 520         }\r
 521 \r
 522 \r
 523 //\r
 524 // scale to the right\r
 525 //\r
 526         slinex = xcenter;\r
 527         stopx = shape->rightpix;\r
 528         if (shape->leftpix<31)\r
 529         {\r
 530                 srcx = 31;\r
 531                 cmdptr = &shape->dataofs[32-shape->leftpix];\r
 532         }\r
 533         else\r
 534         {\r
 535                 srcx = shape->leftpix-1;\r
 536                 cmdptr = &shape->dataofs[0];\r
 537         }\r
 538         slinewidth = 0;\r
 539 \r
 540         while ( ++srcx <= stopx && (slinex+=slinewidth)<viewwidth)\r
 541         {\r
 542                 (unsigned)linecmds = *cmdptr++;\r
 543                 if ( !(slinewidth = comptable->width[srcx]) )\r
 544                         continue;\r
 545 \r
 546                 if (slinewidth == 1)\r
 547                 {\r
 548                         if (slinex>=0 && wallheight[slinex] < height)\r
 549                         {\r
 550                                 ScaleLine ();\r
 551                         }\r
 552                         continue;\r
 553                 }\r
 554 \r
 555                 //\r
 556                 // handle multi pixel lines\r
 557                 //\r
 558                 if (slinex<0)\r
 559                 {\r
 560                         if (slinewidth <= -slinex)\r
 561                                 continue;               // still off the left edge\r
 562 \r
 563                         slinewidth += slinex;\r
 564                         slinex = 0;\r
 565                 }\r
 566                 else\r
 567                 {\r
 568                         if (slinex + slinewidth > viewwidth)\r
 569                                 slinewidth = viewwidth-slinex;\r
 570                 }\r
 571 \r
 572 \r
 573                 leftvis = (wallheight[slinex] < height);\r
 574                 rightvis = (wallheight[slinex+slinewidth-1] < height);\r
 575 \r
 576                 if (leftvis)\r
 577                 {\r
 578                         if (rightvis)\r
 579                         {\r
 580                                 ScaleLine ();\r
 581                         }\r
 582                         else\r
 583                         {\r
 584                                 while (wallheight[slinex+slinewidth-1] >= height)\r
 585                                         slinewidth--;\r
 586                                 ScaleLine ();\r
 587                                 break;                  // the rest of the shape is gone\r
 588                         }\r
 589                 }\r
 590                 else\r
 591                 {\r
 592                         if (rightvis)\r
 593                         {\r
 594                                 while (wallheight[slinex] >= height)\r
 595                                 {\r
 596                                         slinex++;\r
 597                                         slinewidth--;\r
 598                                 }\r
 599                                 ScaleLine ();\r
 600                         }\r
 601                         else\r
 602                                 continue;               // totally obscured\r
 603                 }\r
 604         }\r
 605 }\r
 606 \r
 607 \r
 608 \r
 609 /*\r
 610 =======================\r
 611 =\r
 612 = SimpleScaleShape\r
 613 =\r
 614 = NO CLIPPING, height in pixels\r
 615 =\r
 616 = Draws a compiled shape at [scale] pixels high\r
 617 =\r
 618 = each vertical line of the shape has a pointer to segment data:\r
 619 =       end of segment pixel*2 (0 terminates line) used to patch rtl in scaler\r
 620 =       top of virtual line with segment in proper place\r
 621 =       start of segment pixel*2, used to jsl into compiled scaler\r
 622 =       <repeat>\r
 623 =\r
 624 = Setup for call\r
 625 = --------------\r
 626 = GC_MODE                       read mode 1, write mode 2\r
 627 = GC_COLORDONTCARE  set to 0, so all reads from video memory return 0xff\r
 628 = GC_INDEX                      pointing at GC_BITMASK\r
 629 =\r
 630 =======================\r
 631 */\r
 632 \r
 633 void SimpleScaleShape (int xcenter, int shapenum, unsigned height)\r
 634 {\r
 635         t_compshape     _seg *shape;\r
 636         t_compscale _seg *comptable;\r
 637         unsigned        scale,srcx,stopx,tempx;\r
 638         int                     t;\r
 639         unsigned        far *cmdptr;\r
 640         boolean         leftvis,rightvis;\r
 641 \r
 642 \r
 643         shape = PM_GetSpritePage (shapenum);\r
 644 \r
 645         scale = height>>1;\r
 646         comptable = scaledirectory[scale];\r
 647 \r
 648         *(((unsigned *)&linescale)+1)=(unsigned)comptable;      // seg of far call\r
 649         *(((unsigned *)&linecmds)+1)=(unsigned)shape;           // seg of shape\r
 650 \r
 651 //\r
 652 // scale to the left (from pixel 31 to shape->leftpix)\r
 653 //\r
 654         srcx = 32;\r
 655         slinex = xcenter;\r
 656         stopx = shape->leftpix;\r
 657         cmdptr = &shape->dataofs[31-stopx];\r
 658 \r
 659         while ( --srcx >=stopx )\r
 660         {\r
 661                 (unsigned)linecmds = *cmdptr--;\r
 662                 if ( !(slinewidth = comptable->width[srcx]) )\r
 663                         continue;\r
 664 \r
 665                 slinex -= slinewidth;\r
 666                 ScaleLine ();\r
 667         }\r
 668 \r
 669 \r
 670 //\r
 671 // scale to the right\r
 672 //\r
 673         slinex = xcenter;\r
 674         stopx = shape->rightpix;\r
 675         if (shape->leftpix<31)\r
 676         {\r
 677                 srcx = 31;\r
 678                 cmdptr = &shape->dataofs[32-shape->leftpix];\r
 679         }\r
 680         else\r
 681         {\r
 682                 srcx = shape->leftpix-1;\r
 683                 cmdptr = &shape->dataofs[0];\r
 684         }\r
 685         slinewidth = 0;\r
 686 \r
 687         while ( ++srcx <= stopx )\r
 688         {\r
 689                 (unsigned)linecmds = *cmdptr++;\r
 690                 if ( !(slinewidth = comptable->width[srcx]) )\r
 691                         continue;\r
 692 \r
 693                 ScaleLine ();\r
 694                 slinex+=slinewidth;\r
 695         }\r
 696 }\r
 697 \r
 698 \r
 699 \r
 700 \r
 701 //\r
 702 // bit mask tables for drawing scaled strips up to eight pixels wide\r
 703 //\r
 704 // down here so the STUPID inline assembler doesn't get confused!\r
 705 //\r
 706 \r
 707 \r
 708 byte    mapmasks1[4][8] = {\r
 709 {1 ,3 ,7 ,15,15,15,15,15},\r
 710 {2 ,6 ,14,14,14,14,14,14},\r
 711 {4 ,12,12,12,12,12,12,12},\r
 712 {8 ,8 ,8 ,8 ,8 ,8 ,8 ,8} };\r
 713 \r
 714 byte    mapmasks2[4][8] = {\r
 715 {0 ,0 ,0 ,0 ,1 ,3 ,7 ,15},\r
 716 {0 ,0 ,0 ,1 ,3 ,7 ,15,15},\r
 717 {0 ,0 ,1 ,3 ,7 ,15,15,15},\r
 718 {0 ,1 ,3 ,7 ,15,15,15,15} };\r
 719 \r
 720 byte    mapmasks3[4][8] = {\r
 721 {0 ,0 ,0 ,0 ,0 ,0 ,0 ,0},\r
 722 {0 ,0 ,0 ,0 ,0 ,0 ,0 ,1},\r
 723 {0 ,0 ,0 ,0 ,0 ,0 ,1 ,3},\r
 724 {0 ,0 ,0 ,0 ,0 ,1 ,3 ,7} };\r
 725 \r
 726 \r
 727 unsigned        wordmasks[8][8] = {\r
 728 {0x0080,0x00c0,0x00e0,0x00f0,0x00f8,0x00fc,0x00fe,0x00ff},\r
 729 {0x0040,0x0060,0x0070,0x0078,0x007c,0x007e,0x007f,0x807f},\r
 730 {0x0020,0x0030,0x0038,0x003c,0x003e,0x003f,0x803f,0xc03f},\r
 731 {0x0010,0x0018,0x001c,0x001e,0x001f,0x801f,0xc01f,0xe01f},\r
 732 {0x0008,0x000c,0x000e,0x000f,0x800f,0xc00f,0xe00f,0xf00f},\r
 733 {0x0004,0x0006,0x0007,0x8007,0xc007,0xe007,0xf007,0xf807},\r
 734 {0x0002,0x0003,0x8003,0xc003,0xe003,0xf003,0xf803,0xfc03},\r
 735 {0x0001,0x8001,0xc001,0xe001,0xf001,0xf801,0xfc01,0xfe01} };\r
 736 \r
 737 int                     slinex,slinewidth;\r
 738 unsigned        far *linecmds;\r
 739 long            linescale;\r
 740 unsigned        maskword;\r
 741 \r