Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 1 | /*********************************************************** |
Guido van Rossum | 524b588 | 1995-01-04 19:10:35 +0000 | [diff] [blame] | 2 | Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, |
| 3 | The Netherlands. |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 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)) |
Jack Jansen | 76c79e9 | 1996-01-22 14:55:15 +0000 | [diff] [blame] | 35 | #define SHORTP(cp, xmax, x, y) ((short *)(cp+2*(y*xmax+x))) |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 36 | #define LONGP(cp, xmax, x, y) ((long *)(cp+4*(y*xmax+x))) |
| 37 | |
| 38 | static object *ImageopError; |
| 39 | |
| 40 | static object * |
| 41 | imageop_crop(self, args) |
| 42 | object *self; |
| 43 | object *args; |
| 44 | { |
| 45 | char *cp, *ncp; |
Jack Jansen | 76c79e9 | 1996-01-22 14:55:15 +0000 | [diff] [blame] | 46 | short *nsp; |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 47 | long *nlp; |
| 48 | int len, size, x, y, newx1, newx2, newy1, newy2; |
| 49 | int ix, iy, xstep, ystep; |
| 50 | object *rv; |
| 51 | |
| 52 | if ( !getargs(args, "(s#iiiiiii)", &cp, &len, &size, &x, &y, |
| 53 | &newx1, &newy1, &newx2, &newy2) ) |
| 54 | return 0; |
| 55 | |
Jack Jansen | 76c79e9 | 1996-01-22 14:55:15 +0000 | [diff] [blame] | 56 | if ( size != 1 && size != 2 && size != 4 ) { |
| 57 | err_setstr(ImageopError, "Size should be 1, 2 or 4"); |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 58 | return 0; |
| 59 | } |
| 60 | if ( len != size*x*y ) { |
| 61 | err_setstr(ImageopError, "String has incorrect length"); |
| 62 | return 0; |
| 63 | } |
| 64 | xstep = (newx1 < newx2)? 1 : -1; |
| 65 | ystep = (newy1 < newy2)? 1 : -1; |
| 66 | |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 67 | rv = newsizedstringobject(NULL, |
| 68 | (abs(newx2-newx1)+1)*(abs(newy2-newy1)+1)*size); |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 69 | if ( rv == 0 ) |
| 70 | return 0; |
| 71 | ncp = (char *)getstringvalue(rv); |
Jack Jansen | 76c79e9 | 1996-01-22 14:55:15 +0000 | [diff] [blame] | 72 | nsp = (short *)ncp; |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 73 | nlp = (long *)ncp; |
| 74 | newy2 += ystep; |
| 75 | newx2 += xstep; |
| 76 | for( iy = newy1; iy != newy2; iy+=ystep ) { |
| 77 | for ( ix = newx1; ix != newx2; ix+=xstep ) { |
| 78 | if ( iy < 0 || iy >= y || ix < 0 || ix >= x ) { |
| 79 | if ( size == 1 ) *ncp++ = 0; |
| 80 | else *nlp++ = 0; |
| 81 | } else { |
Jack Jansen | 76c79e9 | 1996-01-22 14:55:15 +0000 | [diff] [blame] | 82 | if ( size == 1 ) *ncp++ = *CHARP(cp, x, ix, iy); |
| 83 | else if ( size == 2 ) *nsp++ = *SHORTP(cp, x, ix, iy); |
| 84 | else *nlp++ = *LONGP(cp, x, ix, iy); |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 85 | } |
| 86 | } |
| 87 | } |
| 88 | return rv; |
| 89 | } |
| 90 | |
| 91 | static object * |
| 92 | imageop_scale(self, args) |
| 93 | object *self; |
| 94 | object *args; |
| 95 | { |
| 96 | char *cp, *ncp; |
Jack Jansen | 76c79e9 | 1996-01-22 14:55:15 +0000 | [diff] [blame] | 97 | short *nsp; |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 98 | long *nlp; |
| 99 | int len, size, x, y, newx, newy; |
| 100 | int ix, iy; |
| 101 | int oix, oiy; |
| 102 | object *rv; |
| 103 | |
| 104 | if ( !getargs(args, "(s#iiiii)", &cp, &len, &size, &x, &y, &newx, &newy) ) |
| 105 | return 0; |
| 106 | |
Jack Jansen | 76c79e9 | 1996-01-22 14:55:15 +0000 | [diff] [blame] | 107 | if ( size != 1 && size != 2 && size != 4 ) { |
| 108 | err_setstr(ImageopError, "Size should be 1, 2 or 4"); |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 109 | return 0; |
| 110 | } |
| 111 | if ( len != size*x*y ) { |
| 112 | err_setstr(ImageopError, "String has incorrect length"); |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | rv = newsizedstringobject(NULL, newx*newy*size); |
| 117 | if ( rv == 0 ) |
| 118 | return 0; |
| 119 | ncp = (char *)getstringvalue(rv); |
Jack Jansen | 76c79e9 | 1996-01-22 14:55:15 +0000 | [diff] [blame] | 120 | nsp = (short *)ncp; |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 121 | nlp = (long *)ncp; |
| 122 | for( iy = 0; iy < newy; iy++ ) { |
| 123 | for ( ix = 0; ix < newx; ix++ ) { |
| 124 | oix = ix * x / newx; |
| 125 | oiy = iy * y / newy; |
Jack Jansen | 76c79e9 | 1996-01-22 14:55:15 +0000 | [diff] [blame] | 126 | if ( size == 1 ) *ncp++ = *CHARP(cp, x, oix, oiy); |
| 127 | else if ( size == 2 ) *nsp++ = *SHORTP(cp, x, oix, oiy); |
| 128 | else *nlp++ = *LONGP(cp, x, oix, oiy); |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 129 | } |
| 130 | } |
| 131 | return rv; |
| 132 | } |
| 133 | |
Jack Jansen | d26b458 | 1993-01-22 15:34:43 +0000 | [diff] [blame] | 134 | /* Note: this routine can use a bit of optimizing */ |
| 135 | |
| 136 | static object * |
| 137 | imageop_tovideo(self, args) |
| 138 | object *self; |
| 139 | object *args; |
| 140 | { |
| 141 | int maxx, maxy, x, y, len; |
| 142 | int i; |
Guido van Rossum | 3bbc62e | 1995-01-02 19:30:30 +0000 | [diff] [blame] | 143 | unsigned char *cp, *ncp; |
Jack Jansen | d26b458 | 1993-01-22 15:34:43 +0000 | [diff] [blame] | 144 | int width; |
| 145 | object *rv; |
| 146 | |
| 147 | |
| 148 | if ( !getargs(args, "(s#iii)", &cp, &len, &width, &maxx, &maxy) ) |
| 149 | return 0; |
| 150 | |
| 151 | if ( width != 1 && width != 4 ) { |
| 152 | err_setstr(ImageopError, "Size should be 1 or 4"); |
| 153 | return 0; |
| 154 | } |
| 155 | if ( maxx*maxy*width != len ) { |
| 156 | err_setstr(ImageopError, "String has incorrect length"); |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | rv = newsizedstringobject(NULL, len); |
| 161 | if ( rv == 0 ) |
| 162 | return 0; |
| 163 | ncp = (unsigned char *)getstringvalue(rv); |
| 164 | |
| 165 | if ( width == 1 ) { |
Guido van Rossum | 1fc238a | 1993-07-29 08:25:09 +0000 | [diff] [blame] | 166 | memcpy(ncp, cp, maxx); /* Copy first line */ |
Jack Jansen | d26b458 | 1993-01-22 15:34:43 +0000 | [diff] [blame] | 167 | ncp += maxx; |
| 168 | for (y=1; y<maxy; y++) { /* Interpolate other lines */ |
| 169 | for(x=0; x<maxx; x++) { |
| 170 | i = y*maxx + x; |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 171 | *ncp++ = ((int)cp[i] + (int)cp[i-maxx]) >> 1; |
Jack Jansen | d26b458 | 1993-01-22 15:34:43 +0000 | [diff] [blame] | 172 | } |
| 173 | } |
| 174 | } else { |
Guido van Rossum | 1fc238a | 1993-07-29 08:25:09 +0000 | [diff] [blame] | 175 | memcpy(ncp, cp, maxx*4); /* Copy first line */ |
Jack Jansen | d26b458 | 1993-01-22 15:34:43 +0000 | [diff] [blame] | 176 | ncp += maxx*4; |
| 177 | for (y=1; y<maxy; y++) { /* Interpolate other lines */ |
| 178 | for(x=0; x<maxx; x++) { |
| 179 | i = (y*maxx + x)*4 + 1; |
| 180 | *ncp++ = 0; /* Skip alfa comp */ |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 181 | *ncp++ = ((int)cp[i] + (int)cp[i-4*maxx]) >> 1; |
Jack Jansen | d26b458 | 1993-01-22 15:34:43 +0000 | [diff] [blame] | 182 | i++; |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 183 | *ncp++ = ((int)cp[i] + (int)cp[i-4*maxx]) >> 1; |
Jack Jansen | d26b458 | 1993-01-22 15:34:43 +0000 | [diff] [blame] | 184 | i++; |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 185 | *ncp++ = ((int)cp[i] + (int)cp[i-4*maxx]) >> 1; |
Jack Jansen | d26b458 | 1993-01-22 15:34:43 +0000 | [diff] [blame] | 186 | } |
| 187 | } |
| 188 | } |
| 189 | return rv; |
| 190 | } |
| 191 | |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 192 | static object * |
| 193 | imageop_grey2mono(self, args) |
| 194 | object *self; |
| 195 | object *args; |
| 196 | { |
| 197 | int tres, x, y, len; |
| 198 | unsigned char *cp, *ncp; |
| 199 | unsigned char ovalue; |
| 200 | object *rv; |
| 201 | int i, bit; |
| 202 | |
| 203 | |
| 204 | if ( !getargs(args, "(s#iii)", &cp, &len, &x, &y, &tres) ) |
| 205 | return 0; |
| 206 | |
| 207 | if ( x*y != len ) { |
| 208 | err_setstr(ImageopError, "String has incorrect length"); |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | rv = newsizedstringobject(NULL, (len+7)/8); |
| 213 | if ( rv == 0 ) |
| 214 | return 0; |
| 215 | ncp = (unsigned char *)getstringvalue(rv); |
| 216 | |
| 217 | bit = 0x80; |
| 218 | ovalue = 0; |
| 219 | for ( i=0; i < len; i++ ) { |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 220 | if ( (int)cp[i] > tres ) |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 221 | ovalue |= bit; |
| 222 | bit >>= 1; |
| 223 | if ( bit == 0 ) { |
| 224 | *ncp++ = ovalue; |
| 225 | bit = 0x80; |
| 226 | ovalue = 0; |
| 227 | } |
| 228 | } |
| 229 | if ( bit != 0x80 ) |
| 230 | *ncp++ = ovalue; |
| 231 | return rv; |
| 232 | } |
| 233 | |
| 234 | static object * |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame] | 235 | imageop_grey2grey4(self, args) |
| 236 | object *self; |
| 237 | object *args; |
| 238 | { |
| 239 | int x, y, len; |
| 240 | unsigned char *cp, *ncp; |
| 241 | unsigned char ovalue; |
| 242 | object *rv; |
| 243 | int i; |
| 244 | int pos; |
| 245 | |
| 246 | |
| 247 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 248 | return 0; |
| 249 | |
| 250 | if ( x*y != len ) { |
| 251 | err_setstr(ImageopError, "String has incorrect length"); |
| 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | rv = newsizedstringobject(NULL, (len+1)/2); |
| 256 | if ( rv == 0 ) |
| 257 | return 0; |
| 258 | ncp = (unsigned char *)getstringvalue(rv); |
| 259 | pos = 0; |
| 260 | ovalue = 0; |
| 261 | for ( i=0; i < len; i++ ) { |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 262 | ovalue |= ((int)cp[i] & 0xf0) >> pos; |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame] | 263 | pos += 4; |
| 264 | if ( pos == 8 ) { |
| 265 | *ncp++ = ovalue; |
| 266 | ovalue = 0; |
| 267 | pos = 0; |
| 268 | } |
| 269 | } |
| 270 | if ( pos != 0 ) |
| 271 | *ncp++ = ovalue; |
| 272 | return rv; |
| 273 | } |
| 274 | |
| 275 | static object * |
| 276 | imageop_grey2grey2(self, args) |
| 277 | object *self; |
| 278 | object *args; |
| 279 | { |
| 280 | int x, y, len; |
| 281 | unsigned char *cp, *ncp; |
| 282 | unsigned char ovalue; |
| 283 | object *rv; |
| 284 | int i; |
| 285 | int pos; |
| 286 | |
| 287 | |
| 288 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 289 | return 0; |
| 290 | |
| 291 | if ( x*y != len ) { |
| 292 | err_setstr(ImageopError, "String has incorrect length"); |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | rv = newsizedstringobject(NULL, (len+3)/4); |
| 297 | if ( rv == 0 ) |
| 298 | return 0; |
| 299 | ncp = (unsigned char *)getstringvalue(rv); |
| 300 | pos = 0; |
| 301 | ovalue = 0; |
| 302 | for ( i=0; i < len; i++ ) { |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 303 | ovalue |= ((int)cp[i] & 0xc0) >> pos; |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame] | 304 | pos += 2; |
| 305 | if ( pos == 8 ) { |
| 306 | *ncp++ = ovalue; |
| 307 | ovalue = 0; |
| 308 | pos = 0; |
| 309 | } |
| 310 | } |
| 311 | if ( pos != 0 ) |
| 312 | *ncp++ = ovalue; |
| 313 | return rv; |
| 314 | } |
| 315 | |
| 316 | static object * |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 317 | imageop_dither2mono(self, args) |
| 318 | object *self; |
| 319 | object *args; |
| 320 | { |
| 321 | int sum, x, y, len; |
| 322 | unsigned char *cp, *ncp; |
| 323 | unsigned char ovalue; |
| 324 | object *rv; |
| 325 | int i, bit; |
| 326 | |
| 327 | |
| 328 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 329 | return 0; |
| 330 | |
| 331 | if ( x*y != len ) { |
| 332 | err_setstr(ImageopError, "String has incorrect length"); |
| 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | rv = newsizedstringobject(NULL, (len+7)/8); |
| 337 | if ( rv == 0 ) |
| 338 | return 0; |
| 339 | ncp = (unsigned char *)getstringvalue(rv); |
| 340 | |
| 341 | bit = 0x80; |
| 342 | ovalue = 0; |
| 343 | sum = 0; |
| 344 | for ( i=0; i < len; i++ ) { |
| 345 | sum += cp[i]; |
| 346 | if ( sum >= 256 ) { |
| 347 | sum -= 256; |
| 348 | ovalue |= bit; |
| 349 | } |
| 350 | bit >>= 1; |
| 351 | if ( bit == 0 ) { |
| 352 | *ncp++ = ovalue; |
| 353 | bit = 0x80; |
| 354 | ovalue = 0; |
| 355 | } |
| 356 | } |
| 357 | if ( bit != 0x80 ) |
| 358 | *ncp++ = ovalue; |
| 359 | return rv; |
| 360 | } |
| 361 | |
| 362 | static object * |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame] | 363 | imageop_dither2grey2(self, args) |
| 364 | object *self; |
| 365 | object *args; |
| 366 | { |
| 367 | int x, y, len; |
| 368 | unsigned char *cp, *ncp; |
| 369 | unsigned char ovalue; |
| 370 | object *rv; |
| 371 | int i; |
| 372 | int pos; |
Jack Jansen | 44fff3c | 1994-12-14 12:55:17 +0000 | [diff] [blame] | 373 | int sum = 0, nvalue; |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame] | 374 | |
| 375 | |
| 376 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 377 | return 0; |
| 378 | |
| 379 | if ( x*y != len ) { |
| 380 | err_setstr(ImageopError, "String has incorrect length"); |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | rv = newsizedstringobject(NULL, (len+3)/4); |
| 385 | if ( rv == 0 ) |
| 386 | return 0; |
| 387 | ncp = (unsigned char *)getstringvalue(rv); |
| 388 | pos = 1; |
| 389 | ovalue = 0; |
| 390 | for ( i=0; i < len; i++ ) { |
| 391 | sum += cp[i]; |
| 392 | nvalue = sum & 0x180; |
| 393 | sum -= nvalue; |
| 394 | ovalue |= nvalue >> pos; |
| 395 | pos += 2; |
| 396 | if ( pos == 9 ) { |
| 397 | *ncp++ = ovalue; |
| 398 | ovalue = 0; |
| 399 | pos = 1; |
| 400 | } |
| 401 | } |
| 402 | if ( pos != 0 ) |
| 403 | *ncp++ = ovalue; |
| 404 | return rv; |
| 405 | } |
| 406 | |
| 407 | static object * |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 408 | imageop_mono2grey(self, args) |
| 409 | object *self; |
| 410 | object *args; |
| 411 | { |
| 412 | int v0, v1, x, y, len, nlen; |
| 413 | unsigned char *cp, *ncp; |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 414 | object *rv; |
Guido van Rossum | 3bbc62e | 1995-01-02 19:30:30 +0000 | [diff] [blame] | 415 | int i, bit; |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 416 | |
| 417 | if ( !getargs(args, "(s#iiii)", &cp, &len, &x, &y, &v0, &v1) ) |
| 418 | return 0; |
| 419 | |
| 420 | nlen = x*y; |
| 421 | if ( (nlen+7)/8 != len ) { |
| 422 | err_setstr(ImageopError, "String has incorrect length"); |
| 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | rv = newsizedstringobject(NULL, nlen); |
| 427 | if ( rv == 0 ) |
| 428 | return 0; |
| 429 | ncp = (unsigned char *)getstringvalue(rv); |
| 430 | |
| 431 | bit = 0x80; |
| 432 | for ( i=0; i < nlen; i++ ) { |
| 433 | if ( *cp & bit ) |
| 434 | *ncp++ = v1; |
| 435 | else |
| 436 | *ncp++ = v0; |
| 437 | bit >>= 1; |
| 438 | if ( bit == 0 ) { |
| 439 | bit = 0x80; |
| 440 | cp++; |
| 441 | } |
| 442 | } |
| 443 | return rv; |
| 444 | } |
| 445 | |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame] | 446 | static object * |
| 447 | imageop_grey22grey(self, args) |
| 448 | object *self; |
| 449 | object *args; |
| 450 | { |
| 451 | int x, y, len, nlen; |
| 452 | unsigned char *cp, *ncp; |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame] | 453 | object *rv; |
| 454 | int i, pos, value, nvalue; |
| 455 | |
| 456 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 457 | return 0; |
| 458 | |
| 459 | nlen = x*y; |
| 460 | if ( (nlen+3)/4 != len ) { |
| 461 | err_setstr(ImageopError, "String has incorrect length"); |
| 462 | return 0; |
| 463 | } |
| 464 | |
| 465 | rv = newsizedstringobject(NULL, nlen); |
| 466 | if ( rv == 0 ) |
| 467 | return 0; |
| 468 | ncp = (unsigned char *)getstringvalue(rv); |
| 469 | |
| 470 | pos = 0; |
| 471 | for ( i=0; i < nlen; i++ ) { |
| 472 | if ( pos == 0 ) { |
| 473 | value = *cp++; |
| 474 | pos = 8; |
| 475 | } |
| 476 | pos -= 2; |
| 477 | nvalue = (value >> pos) & 0x03; |
| 478 | *ncp++ = nvalue | (nvalue << 2) | (nvalue << 4) | (nvalue << 6); |
| 479 | } |
| 480 | return rv; |
| 481 | } |
| 482 | |
| 483 | static object * |
| 484 | imageop_grey42grey(self, args) |
| 485 | object *self; |
| 486 | object *args; |
| 487 | { |
| 488 | int x, y, len, nlen; |
| 489 | unsigned char *cp, *ncp; |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame] | 490 | object *rv; |
| 491 | int i, pos, value, nvalue; |
| 492 | |
| 493 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 494 | return 0; |
| 495 | |
| 496 | nlen = x*y; |
| 497 | if ( (nlen+1)/2 != len ) { |
| 498 | err_setstr(ImageopError, "String has incorrect length"); |
| 499 | return 0; |
| 500 | } |
| 501 | |
| 502 | rv = newsizedstringobject(NULL, nlen); |
| 503 | if ( rv == 0 ) |
| 504 | return 0; |
| 505 | ncp = (unsigned char *)getstringvalue(rv); |
| 506 | |
| 507 | pos = 0; |
| 508 | for ( i=0; i < nlen; i++ ) { |
| 509 | if ( pos == 0 ) { |
| 510 | value = *cp++; |
| 511 | pos = 8; |
| 512 | } |
| 513 | pos -= 4; |
| 514 | nvalue = (value >> pos) & 0x0f; |
| 515 | *ncp++ = nvalue | (nvalue << 4); |
| 516 | } |
| 517 | return rv; |
| 518 | } |
| 519 | |
Jack Jansen | 4fada9c | 1993-02-19 15:51:41 +0000 | [diff] [blame] | 520 | static object * |
| 521 | imageop_rgb2rgb8(self, args) |
| 522 | object *self; |
| 523 | object *args; |
| 524 | { |
| 525 | int x, y, len, nlen; |
| 526 | unsigned long *cp; |
| 527 | unsigned char *ncp; |
| 528 | object *rv; |
| 529 | int i, r, g, b; |
| 530 | unsigned long value, nvalue; |
| 531 | |
| 532 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 533 | return 0; |
| 534 | |
| 535 | nlen = x*y; |
| 536 | if ( nlen*4 != len ) { |
| 537 | err_setstr(ImageopError, "String has incorrect length"); |
| 538 | return 0; |
| 539 | } |
| 540 | |
| 541 | rv = newsizedstringobject(NULL, nlen); |
| 542 | if ( rv == 0 ) |
| 543 | return 0; |
| 544 | ncp = (unsigned char *)getstringvalue(rv); |
| 545 | |
| 546 | for ( i=0; i < nlen; i++ ) { |
| 547 | /* Bits in source: aaaaaaaa BBbbbbbb GGGggggg RRRrrrrr */ |
| 548 | value = *cp++; |
Sjoerd Mullender | a9c3c22 | 1993-10-11 12:54:31 +0000 | [diff] [blame] | 549 | #if 0 |
Jack Jansen | 4fada9c | 1993-02-19 15:51:41 +0000 | [diff] [blame] | 550 | r = (value >> 5) & 7; |
| 551 | g = (value >> 13) & 7; |
| 552 | b = (value >> 22) & 3; |
Sjoerd Mullender | a9c3c22 | 1993-10-11 12:54:31 +0000 | [diff] [blame] | 553 | #else |
| 554 | r = (int) ((value & 0xff) / 255. * 7. + .5); |
| 555 | g = (int) (((value >> 8) & 0xff) / 255. * 7. + .5); |
| 556 | b = (int) (((value >> 16) & 0xff) / 255. * 3. + .5); |
| 557 | #endif |
Jack Jansen | 4fada9c | 1993-02-19 15:51:41 +0000 | [diff] [blame] | 558 | nvalue = (r<<5) | (b<<3) | g; |
| 559 | *ncp++ = nvalue; |
| 560 | } |
| 561 | return rv; |
| 562 | } |
| 563 | |
| 564 | static object * |
| 565 | imageop_rgb82rgb(self, args) |
| 566 | object *self; |
| 567 | object *args; |
| 568 | { |
| 569 | int x, y, len, nlen; |
| 570 | unsigned char *cp; |
| 571 | unsigned long *ncp; |
| 572 | object *rv; |
| 573 | int i, r, g, b; |
| 574 | unsigned long value, nvalue; |
| 575 | |
| 576 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 577 | return 0; |
| 578 | |
| 579 | nlen = x*y; |
| 580 | if ( nlen != len ) { |
| 581 | err_setstr(ImageopError, "String has incorrect length"); |
| 582 | return 0; |
| 583 | } |
| 584 | |
| 585 | rv = newsizedstringobject(NULL, nlen*4); |
| 586 | if ( rv == 0 ) |
| 587 | return 0; |
| 588 | ncp = (unsigned long *)getstringvalue(rv); |
| 589 | |
| 590 | for ( i=0; i < nlen; i++ ) { |
| 591 | /* Bits in source: RRRBBGGG |
| 592 | ** Red and Green are multiplied by 36.5, Blue by 85 |
| 593 | */ |
| 594 | value = *cp++; |
| 595 | r = (value >> 5) & 7; |
| 596 | g = (value ) & 7; |
| 597 | b = (value >> 3) & 3; |
| 598 | r = (r<<5) | (r<<3) | (r>>1); |
| 599 | g = (g<<5) | (g<<3) | (g>>1); |
| 600 | b = (b<<6) | (b<<4) | (b<<2) | b; |
| 601 | nvalue = r | (g<<8) | (b<<16); |
| 602 | *ncp++ = nvalue; |
| 603 | } |
| 604 | return rv; |
| 605 | } |
| 606 | |
| 607 | static object * |
| 608 | imageop_rgb2grey(self, args) |
| 609 | object *self; |
| 610 | object *args; |
| 611 | { |
| 612 | int x, y, len, nlen; |
| 613 | unsigned long *cp; |
| 614 | unsigned char *ncp; |
| 615 | object *rv; |
| 616 | int i, r, g, b; |
| 617 | unsigned long value, nvalue; |
| 618 | |
| 619 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 620 | return 0; |
| 621 | |
| 622 | nlen = x*y; |
| 623 | if ( nlen*4 != len ) { |
| 624 | err_setstr(ImageopError, "String has incorrect length"); |
| 625 | return 0; |
| 626 | } |
| 627 | |
| 628 | rv = newsizedstringobject(NULL, nlen); |
| 629 | if ( rv == 0 ) |
| 630 | return 0; |
| 631 | ncp = (unsigned char *)getstringvalue(rv); |
| 632 | |
| 633 | for ( i=0; i < nlen; i++ ) { |
| 634 | value = *cp++; |
| 635 | r = (value ) & 0xff; |
| 636 | g = (value >> 8) & 0xff; |
| 637 | b = (value >> 16) & 0xff; |
| 638 | nvalue = (int)(0.30*r + 0.59*g + 0.11*b); |
| 639 | if ( nvalue > 255 ) nvalue = 255; |
| 640 | *ncp++ = nvalue; |
| 641 | } |
| 642 | return rv; |
| 643 | } |
| 644 | |
| 645 | static object * |
| 646 | imageop_grey2rgb(self, args) |
| 647 | object *self; |
| 648 | object *args; |
| 649 | { |
| 650 | int x, y, len, nlen; |
| 651 | unsigned char *cp; |
| 652 | unsigned long *ncp; |
| 653 | object *rv; |
| 654 | int i; |
| 655 | unsigned long value; |
| 656 | |
| 657 | if ( !getargs(args, "(s#ii)", &cp, &len, &x, &y) ) |
| 658 | return 0; |
| 659 | |
| 660 | nlen = x*y; |
| 661 | if ( nlen != len ) { |
| 662 | err_setstr(ImageopError, "String has incorrect length"); |
| 663 | return 0; |
| 664 | } |
| 665 | |
| 666 | rv = newsizedstringobject(NULL, nlen*4); |
| 667 | if ( rv == 0 ) |
| 668 | return 0; |
| 669 | ncp = (unsigned long *)getstringvalue(rv); |
| 670 | |
| 671 | for ( i=0; i < nlen; i++ ) { |
| 672 | value = *cp++; |
| 673 | *ncp++ = value | (value << 8 ) | (value << 16); |
| 674 | } |
| 675 | return rv; |
| 676 | } |
| 677 | |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 678 | /* |
| 679 | static object * |
| 680 | imageop_mul(self, args) |
| 681 | object *self; |
| 682 | object *args; |
| 683 | { |
| 684 | char *cp, *ncp; |
| 685 | int len, size, x, y; |
| 686 | object *rv; |
| 687 | int i; |
| 688 | |
| 689 | if ( !getargs(args, "(s#iii)", &cp, &len, &size, &x, &y) ) |
| 690 | return 0; |
| 691 | |
| 692 | if ( size != 1 && size != 4 ) { |
| 693 | err_setstr(ImageopError, "Size should be 1 or 4"); |
| 694 | return 0; |
| 695 | } |
| 696 | if ( len != size*x*y ) { |
| 697 | err_setstr(ImageopError, "String has incorrect length"); |
| 698 | return 0; |
| 699 | } |
| 700 | |
| 701 | rv = newsizedstringobject(NULL, XXXX); |
| 702 | if ( rv == 0 ) |
| 703 | return 0; |
| 704 | ncp = (char *)getstringvalue(rv); |
| 705 | |
| 706 | |
| 707 | for ( i=0; i < len; i += size ) { |
| 708 | } |
| 709 | return rv; |
| 710 | } |
| 711 | */ |
| 712 | |
| 713 | static struct methodlist imageop_methods[] = { |
| 714 | { "crop", imageop_crop }, |
| 715 | { "scale", imageop_scale }, |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 716 | { "grey2mono", imageop_grey2mono }, |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame] | 717 | { "grey2grey2", imageop_grey2grey2 }, |
| 718 | { "grey2grey4", imageop_grey2grey4 }, |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 719 | { "dither2mono", imageop_dither2mono }, |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame] | 720 | { "dither2grey2", imageop_dither2grey2 }, |
Guido van Rossum | 5f59d60 | 1992-12-14 16:59:51 +0000 | [diff] [blame] | 721 | { "mono2grey", imageop_mono2grey }, |
Jack Jansen | de3adf9 | 1992-12-22 14:05:55 +0000 | [diff] [blame] | 722 | { "grey22grey", imageop_grey22grey }, |
| 723 | { "grey42grey", imageop_grey42grey }, |
Jack Jansen | d26b458 | 1993-01-22 15:34:43 +0000 | [diff] [blame] | 724 | { "tovideo", imageop_tovideo }, |
Jack Jansen | 4fada9c | 1993-02-19 15:51:41 +0000 | [diff] [blame] | 725 | { "rgb2rgb8", imageop_rgb2rgb8 }, |
| 726 | { "rgb82rgb", imageop_rgb82rgb }, |
| 727 | { "rgb2grey", imageop_rgb2grey }, |
| 728 | { "grey2rgb", imageop_grey2rgb }, |
Guido van Rossum | 0317a47 | 1992-10-26 13:40:15 +0000 | [diff] [blame] | 729 | { 0, 0 } |
| 730 | }; |
| 731 | |
| 732 | |
| 733 | void |
| 734 | initimageop() |
| 735 | { |
| 736 | object *m, *d; |
| 737 | m = initmodule("imageop", imageop_methods); |
| 738 | d = getmoduledict(m); |
| 739 | ImageopError = newstringobject("imageop.error"); |
| 740 | if ( ImageopError == NULL || dictinsert(d,"error",ImageopError) ) |
| 741 | fatal("can't define imageop.error"); |
| 742 | } |