Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 1 | /*********************************************************** |
| 2 | Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The |
| 3 | Netherlands. |
| 4 | |
| 5 | All Rights Reserved |
| 6 | |
| 7 | Permission to use, copy, modify, and distribute this software and its |
| 8 | documentation for any purpose and without fee is hereby granted, |
| 9 | provided that the above copyright notice appear in all copies and that |
| 10 | both that copyright notice and this permission notice appear in |
| 11 | supporting documentation, and that the names of Stichting Mathematisch |
| 12 | Centrum or CWI not be used in advertising or publicity pertaining to |
| 13 | distribution of the software without specific, written prior permission. |
| 14 | |
| 15 | STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO |
| 16 | THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| 17 | FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE |
| 18 | FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 19 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 20 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| 21 | OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 22 | |
| 23 | ******************************************************************/ |
| 24 | |
| 25 | /* imageopmodule - Various operations on pictures */ |
| 26 | |
| 27 | #ifdef sun |
| 28 | #define signed |
| 29 | #endif |
| 30 | |
| 31 | #include "allobjects.h" |
| 32 | #include "modsupport.h" |
| 33 | |
| 34 | #define CHARP(cp, xmax, x, y) ((char *)(cp+y*xmax+x)) |
| 35 | #define LONGP(cp, xmax, x, y) ((long *)(cp+4*(y*xmax+x))) |
| 36 | |
| 37 | static object *ImageopError; |
| 38 | |
| 39 | static object * |
| 40 | imageop_crop(self, args) |
| 41 | object *self; |
| 42 | object *args; |
| 43 | { |
| 44 | char *cp, *ncp; |
| 45 | long *nlp; |
| 46 | int len, size, x, y, newx1, newx2, newy1, newy2; |
| 47 | int ix, iy, xstep, ystep; |
| 48 | object *rv; |
| 49 | |
| 50 | if ( !getargs(args, "(s#iiiiiii)", &cp, &len, &size, &x, &y, |
| 51 | &newx1, &newy1, &newx2, &newy2) ) |
| 52 | return 0; |
| 53 | |
| 54 | if ( size != 1 && size != 4 ) { |
| 55 | err_setstr(ImageopError, "Size should be 1 or 4"); |
| 56 | return 0; |
| 57 | } |
| 58 | if ( len != size*x*y ) { |
| 59 | err_setstr(ImageopError, "String has incorrect length"); |
| 60 | return 0; |
| 61 | } |
| 62 | xstep = (newx1 < newx2)? 1 : -1; |
| 63 | ystep = (newy1 < newy2)? 1 : -1; |
| 64 | |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 65 | rv = newsizedstringobject(NULL, |
| 66 | (abs(newx2-newx1)+1)*(abs(newy2-newy1)+1)*size); |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 67 | if ( rv == 0 ) |
| 68 | return 0; |
| 69 | ncp = (char *)getstringvalue(rv); |
| 70 | nlp = (long *)ncp; |
| 71 | newy2 += ystep; |
| 72 | newx2 += xstep; |
| 73 | for( iy = newy1; iy != newy2; iy+=ystep ) { |
| 74 | for ( ix = newx1; ix != newx2; ix+=xstep ) { |
| 75 | if ( iy < 0 || iy >= y || ix < 0 || ix >= x ) { |
| 76 | if ( size == 1 ) *ncp++ = 0; |
| 77 | else *nlp++ = 0; |
| 78 | } else { |
| 79 | if ( size == 1 ) *ncp++ = *CHARP(cp, x, ix, iy); |
| 80 | else *nlp++ = *LONGP(cp, x, ix, iy); |
| 81 | } |
| 82 | } |
| 83 | } |
| 84 | return rv; |
| 85 | } |
| 86 | |
| 87 | static object * |
| 88 | imageop_scale(self, args) |
| 89 | object *self; |
| 90 | object *args; |
| 91 | { |
| 92 | char *cp, *ncp; |
| 93 | long *nlp; |
| 94 | int len, size, x, y, newx, newy; |
| 95 | int ix, iy; |
| 96 | int oix, oiy; |
| 97 | object *rv; |
| 98 | |
| 99 | if ( !getargs(args, "(s#iiiii)", &cp, &len, &size, &x, &y, &newx, &newy) ) |
| 100 | return 0; |
| 101 | |
| 102 | if ( size != 1 && size != 4 ) { |
| 103 | err_setstr(ImageopError, "Size should be 1 or 4"); |
| 104 | return 0; |
| 105 | } |
| 106 | if ( len != size*x*y ) { |
| 107 | err_setstr(ImageopError, "String has incorrect length"); |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | rv = newsizedstringobject(NULL, newx*newy*size); |
| 112 | if ( rv == 0 ) |
| 113 | return 0; |
| 114 | ncp = (char *)getstringvalue(rv); |
| 115 | nlp = (long *)ncp; |
| 116 | for( iy = 0; iy < newy; iy++ ) { |
| 117 | for ( ix = 0; ix < newx; ix++ ) { |
| 118 | oix = ix * x / newx; |
| 119 | oiy = iy * y / newy; |
| 120 | if ( size == 1 ) *ncp++ = *CHARP(cp, x, oix, oiy); |
| 121 | else *nlp++ = *LONGP(cp, x, oix, oiy); |
| 122 | } |
| 123 | } |
| 124 | return rv; |
| 125 | } |
| 126 | |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 127 | static object * |
| 128 | imageop_grey2mono(self, args) |
| 129 | object *self; |
| 130 | object *args; |
| 131 | { |
| 132 | int tres, x, y, len; |
| 133 | unsigned char *cp, *ncp; |
| 134 | unsigned char ovalue; |
| 135 | object *rv; |
| 136 | int i, bit; |
| 137 | |
| 138 | |
| 139 | if ( !getargs(args, "(s#iii)", &cp, &len, &x, &y, &tres) ) |
| 140 | return 0; |
| 141 | |
| 142 | if ( x*y != len ) { |
| 143 | err_setstr(ImageopError, "String has incorrect length"); |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | rv = newsizedstringobject(NULL, (len+7)/8); |
| 148 | if ( rv == 0 ) |
| 149 | return 0; |
| 150 | ncp = (unsigned char *)getstringvalue(rv); |
| 151 | |
| 152 | bit = 0x80; |
| 153 | ovalue = 0; |
| 154 | for ( i=0; i < len; i++ ) { |
| 155 | if ( cp[i] > tres ) |
| 156 | ovalue |= bit; |
| 157 | bit >>= 1; |
| 158 | if ( bit == 0 ) { |
| 159 | *ncp++ = ovalue; |
| 160 | bit = 0x80; |
| 161 | ovalue = 0; |
| 162 | } |
| 163 | } |
| 164 | if ( bit != 0x80 ) |
| 165 | *ncp++ = ovalue; |
| 166 | return rv; |
| 167 | } |
| 168 | |
| 169 | static object * |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame^] | 170 | imageop_grey2grey4(self, args) |
| 171 | object *self; |
| 172 | object *args; |
| 173 | { |
| 174 | int x, y, len; |
| 175 | unsigned char *cp, *ncp; |
| 176 | unsigned char ovalue; |
| 177 | object *rv; |
| 178 | int i; |
| 179 | int pos; |
| 180 | |
| 181 | |
| 182 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 183 | return 0; |
| 184 | |
| 185 | if ( x*y != len ) { |
| 186 | err_setstr(ImageopError, "String has incorrect length"); |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | rv = newsizedstringobject(NULL, (len+1)/2); |
| 191 | if ( rv == 0 ) |
| 192 | return 0; |
| 193 | ncp = (unsigned char *)getstringvalue(rv); |
| 194 | pos = 0; |
| 195 | ovalue = 0; |
| 196 | for ( i=0; i < len; i++ ) { |
| 197 | ovalue |= (cp[i] & 0xf0) >> pos; |
| 198 | pos += 4; |
| 199 | if ( pos == 8 ) { |
| 200 | *ncp++ = ovalue; |
| 201 | ovalue = 0; |
| 202 | pos = 0; |
| 203 | } |
| 204 | } |
| 205 | if ( pos != 0 ) |
| 206 | *ncp++ = ovalue; |
| 207 | return rv; |
| 208 | } |
| 209 | |
| 210 | static object * |
| 211 | imageop_grey2grey2(self, args) |
| 212 | object *self; |
| 213 | object *args; |
| 214 | { |
| 215 | int x, y, len; |
| 216 | unsigned char *cp, *ncp; |
| 217 | unsigned char ovalue; |
| 218 | object *rv; |
| 219 | int i; |
| 220 | int pos; |
| 221 | |
| 222 | |
| 223 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 224 | return 0; |
| 225 | |
| 226 | if ( x*y != len ) { |
| 227 | err_setstr(ImageopError, "String has incorrect length"); |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | rv = newsizedstringobject(NULL, (len+3)/4); |
| 232 | if ( rv == 0 ) |
| 233 | return 0; |
| 234 | ncp = (unsigned char *)getstringvalue(rv); |
| 235 | pos = 0; |
| 236 | ovalue = 0; |
| 237 | for ( i=0; i < len; i++ ) { |
| 238 | ovalue |= (cp[i] & 0xc0) >> pos; |
| 239 | pos += 2; |
| 240 | if ( pos == 8 ) { |
| 241 | *ncp++ = ovalue; |
| 242 | ovalue = 0; |
| 243 | pos = 0; |
| 244 | } |
| 245 | } |
| 246 | if ( pos != 0 ) |
| 247 | *ncp++ = ovalue; |
| 248 | return rv; |
| 249 | } |
| 250 | |
| 251 | static object * |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 252 | imageop_dither2mono(self, args) |
| 253 | object *self; |
| 254 | object *args; |
| 255 | { |
| 256 | int sum, x, y, len; |
| 257 | unsigned char *cp, *ncp; |
| 258 | unsigned char ovalue; |
| 259 | object *rv; |
| 260 | int i, bit; |
| 261 | |
| 262 | |
| 263 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 264 | return 0; |
| 265 | |
| 266 | if ( x*y != len ) { |
| 267 | err_setstr(ImageopError, "String has incorrect length"); |
| 268 | return 0; |
| 269 | } |
| 270 | |
| 271 | rv = newsizedstringobject(NULL, (len+7)/8); |
| 272 | if ( rv == 0 ) |
| 273 | return 0; |
| 274 | ncp = (unsigned char *)getstringvalue(rv); |
| 275 | |
| 276 | bit = 0x80; |
| 277 | ovalue = 0; |
| 278 | sum = 0; |
| 279 | for ( i=0; i < len; i++ ) { |
| 280 | sum += cp[i]; |
| 281 | if ( sum >= 256 ) { |
| 282 | sum -= 256; |
| 283 | ovalue |= bit; |
| 284 | } |
| 285 | bit >>= 1; |
| 286 | if ( bit == 0 ) { |
| 287 | *ncp++ = ovalue; |
| 288 | bit = 0x80; |
| 289 | ovalue = 0; |
| 290 | } |
| 291 | } |
| 292 | if ( bit != 0x80 ) |
| 293 | *ncp++ = ovalue; |
| 294 | return rv; |
| 295 | } |
| 296 | |
| 297 | static object * |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame^] | 298 | imageop_dither2grey2(self, args) |
| 299 | object *self; |
| 300 | object *args; |
| 301 | { |
| 302 | int x, y, len; |
| 303 | unsigned char *cp, *ncp; |
| 304 | unsigned char ovalue; |
| 305 | object *rv; |
| 306 | int i; |
| 307 | int pos; |
| 308 | int sum, nvalue; |
| 309 | |
| 310 | |
| 311 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 312 | return 0; |
| 313 | |
| 314 | if ( x*y != len ) { |
| 315 | err_setstr(ImageopError, "String has incorrect length"); |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | rv = newsizedstringobject(NULL, (len+3)/4); |
| 320 | if ( rv == 0 ) |
| 321 | return 0; |
| 322 | ncp = (unsigned char *)getstringvalue(rv); |
| 323 | pos = 1; |
| 324 | ovalue = 0; |
| 325 | for ( i=0; i < len; i++ ) { |
| 326 | sum += cp[i]; |
| 327 | nvalue = sum & 0x180; |
| 328 | sum -= nvalue; |
| 329 | ovalue |= nvalue >> pos; |
| 330 | pos += 2; |
| 331 | if ( pos == 9 ) { |
| 332 | *ncp++ = ovalue; |
| 333 | ovalue = 0; |
| 334 | pos = 1; |
| 335 | } |
| 336 | } |
| 337 | if ( pos != 0 ) |
| 338 | *ncp++ = ovalue; |
| 339 | return rv; |
| 340 | } |
| 341 | |
| 342 | static object * |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 343 | imageop_mono2grey(self, args) |
| 344 | object *self; |
| 345 | object *args; |
| 346 | { |
| 347 | int v0, v1, x, y, len, nlen; |
| 348 | unsigned char *cp, *ncp; |
| 349 | unsigned char ovalue; |
| 350 | object *rv; |
| 351 | int i, bit, value; |
| 352 | |
| 353 | if ( !getargs(args, "(s#iiii)", &cp, &len, &x, &y, &v0, &v1) ) |
| 354 | return 0; |
| 355 | |
| 356 | nlen = x*y; |
| 357 | if ( (nlen+7)/8 != len ) { |
| 358 | err_setstr(ImageopError, "String has incorrect length"); |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | rv = newsizedstringobject(NULL, nlen); |
| 363 | if ( rv == 0 ) |
| 364 | return 0; |
| 365 | ncp = (unsigned char *)getstringvalue(rv); |
| 366 | |
| 367 | bit = 0x80; |
| 368 | for ( i=0; i < nlen; i++ ) { |
| 369 | if ( *cp & bit ) |
| 370 | *ncp++ = v1; |
| 371 | else |
| 372 | *ncp++ = v0; |
| 373 | bit >>= 1; |
| 374 | if ( bit == 0 ) { |
| 375 | bit = 0x80; |
| 376 | cp++; |
| 377 | } |
| 378 | } |
| 379 | return rv; |
| 380 | } |
| 381 | |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame^] | 382 | static object * |
| 383 | imageop_grey22grey(self, args) |
| 384 | object *self; |
| 385 | object *args; |
| 386 | { |
| 387 | int x, y, len, nlen; |
| 388 | unsigned char *cp, *ncp; |
| 389 | unsigned char ovalue; |
| 390 | object *rv; |
| 391 | int i, pos, value, nvalue; |
| 392 | |
| 393 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 394 | return 0; |
| 395 | |
| 396 | nlen = x*y; |
| 397 | if ( (nlen+3)/4 != len ) { |
| 398 | err_setstr(ImageopError, "String has incorrect length"); |
| 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | rv = newsizedstringobject(NULL, nlen); |
| 403 | if ( rv == 0 ) |
| 404 | return 0; |
| 405 | ncp = (unsigned char *)getstringvalue(rv); |
| 406 | |
| 407 | pos = 0; |
| 408 | for ( i=0; i < nlen; i++ ) { |
| 409 | if ( pos == 0 ) { |
| 410 | value = *cp++; |
| 411 | pos = 8; |
| 412 | } |
| 413 | pos -= 2; |
| 414 | nvalue = (value >> pos) & 0x03; |
| 415 | *ncp++ = nvalue | (nvalue << 2) | (nvalue << 4) | (nvalue << 6); |
| 416 | } |
| 417 | return rv; |
| 418 | } |
| 419 | |
| 420 | static object * |
| 421 | imageop_grey42grey(self, args) |
| 422 | object *self; |
| 423 | object *args; |
| 424 | { |
| 425 | int x, y, len, nlen; |
| 426 | unsigned char *cp, *ncp; |
| 427 | unsigned char ovalue; |
| 428 | object *rv; |
| 429 | int i, pos, value, nvalue; |
| 430 | |
| 431 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 432 | return 0; |
| 433 | |
| 434 | nlen = x*y; |
| 435 | if ( (nlen+1)/2 != len ) { |
| 436 | err_setstr(ImageopError, "String has incorrect length"); |
| 437 | return 0; |
| 438 | } |
| 439 | |
| 440 | rv = newsizedstringobject(NULL, nlen); |
| 441 | if ( rv == 0 ) |
| 442 | return 0; |
| 443 | ncp = (unsigned char *)getstringvalue(rv); |
| 444 | |
| 445 | pos = 0; |
| 446 | for ( i=0; i < nlen; i++ ) { |
| 447 | if ( pos == 0 ) { |
| 448 | value = *cp++; |
| 449 | pos = 8; |
| 450 | } |
| 451 | pos -= 4; |
| 452 | nvalue = (value >> pos) & 0x0f; |
| 453 | *ncp++ = nvalue | (nvalue << 4); |
| 454 | } |
| 455 | return rv; |
| 456 | } |
| 457 | |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 458 | /* |
| 459 | static object * |
| 460 | imageop_mul(self, args) |
| 461 | object *self; |
| 462 | object *args; |
| 463 | { |
| 464 | char *cp, *ncp; |
| 465 | int len, size, x, y; |
| 466 | object *rv; |
| 467 | int i; |
| 468 | |
| 469 | if ( !getargs(args, "(s#iii)", &cp, &len, &size, &x, &y) ) |
| 470 | return 0; |
| 471 | |
| 472 | if ( size != 1 && size != 4 ) { |
| 473 | err_setstr(ImageopError, "Size should be 1 or 4"); |
| 474 | return 0; |
| 475 | } |
| 476 | if ( len != size*x*y ) { |
| 477 | err_setstr(ImageopError, "String has incorrect length"); |
| 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | rv = newsizedstringobject(NULL, XXXX); |
| 482 | if ( rv == 0 ) |
| 483 | return 0; |
| 484 | ncp = (char *)getstringvalue(rv); |
| 485 | |
| 486 | |
| 487 | for ( i=0; i < len; i += size ) { |
| 488 | } |
| 489 | return rv; |
| 490 | } |
| 491 | */ |
| 492 | |
| 493 | static struct methodlist imageop_methods[] = { |
| 494 | { "crop", imageop_crop }, |
| 495 | { "scale", imageop_scale }, |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 496 | { "grey2mono", imageop_grey2mono }, |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame^] | 497 | { "grey2grey2", imageop_grey2grey2 }, |
| 498 | { "grey2grey4", imageop_grey2grey4 }, |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 499 | { "dither2mono", imageop_dither2mono }, |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame^] | 500 | { "dither2grey2", imageop_dither2grey2 }, |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 501 | { "mono2grey", imageop_mono2grey }, |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame^] | 502 | { "grey22grey", imageop_grey22grey }, |
| 503 | { "grey42grey", imageop_grey42grey }, |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 504 | { 0, 0 } |
| 505 | }; |
| 506 | |
| 507 | |
| 508 | void |
| 509 | initimageop() |
| 510 | { |
| 511 | object *m, *d; |
| 512 | m = initmodule("imageop", imageop_methods); |
| 513 | d = getmoduledict(m); |
| 514 | ImageopError = newstringobject("imageop.error"); |
| 515 | if ( ImageopError == NULL || dictinsert(d,"error",ImageopError) ) |
| 516 | fatal("can't define imageop.error"); |
| 517 | } |