Mercurial > hg > xemacs-beta
annotate src/imgproc.c @ 5284:d27c1ee1943b
Make the order of preloaded-file-list more sane.
lisp/ChangeLog addition:
2010-10-12 Aidan Kehoe <kehoea@parhasard.net>
* abbrev.el (fundamental-mode-abbrev-table, global-abbrev-table):
Create both these abbrev tables using the usual
#'define-abbrev-table calls, rather than attempting to
special-case them.
* cl-extra.el: Force cl-macs to be loaded here, if cl-extra.el is
being loaded interpreted. Previously other, later files would
redundantly call (load "cl-macs") when interpreted, it's more
reasonable to do it here, once.
* cmdloop.el (read-quoted-char-radix): Use defcustom here, we
don't have any dump-order dependencies that would prevent that.
* custom.el (eval-when-compile): Don't load cl-macs when
interpreted or when byte-compiling, rely on cl-extra.el in the
former case and the appropriate entry in bytecomp-load-hook in the
latter. Get rid of custom-declare-variable-list, we have no
dump-time dependencies that would require it.
* faces.el (eval-when-compile): Don't load cl-macs when
interpreted or when byte-compiling.
* packages.el: Remove some inaccurate comments.
* post-gc.el (cleanup-simple-finalizers): Use #'delete-if-not
here, now the order of preloaded-file-list has been changed to
make it available.
* subr.el (custom-declare-variable-list): Remove. No need for it.
Also remove a stub define-abbrev-table from this file, given the
current order of preloaded-file-list there's no need for it.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Tue, 12 Oct 2010 21:11:46 +0100 |
| parents | 6c6d78781d59 |
| children | 2aa9cd456ae7 |
| rev | line source |
|---|---|
| 428 | 1 /* Image processing functions |
| 2 Copyright (C) 1998 Jareth Hein | |
| 3 | |
| 4 This file is a part of XEmacs | |
| 5 | |
| 6 XEmacs is free software; you can redistribute it and/or modify it | |
| 7 under the terms of the GNU General Public License as published by the | |
| 8 Free Software Foundation; either version 2, or (at your option) any | |
| 9 later version. | |
| 10 | |
| 11 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with XEmacs; see the file COPYING. If not, write to | |
| 18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 19 Boston, MA 02111-1307, USA. */ | |
| 20 | |
| 21 /* Synched up with: Not in FSF. */ | |
| 22 | |
| 23 /* Original author: Jareth Hein */ | |
| 24 | |
| 25 /* Parts of this file are based on code from Sam Leffler's tiff library, | |
| 26 with the original copyright displayed here: | |
| 27 | |
| 28 Copyright (c) 1988-1997 Sam Leffler | |
| 29 Copyright (c) 1991-1997 Silicon Graphics, Inc. | |
|
5169
6c6d78781d59
cleanup of code related to xfree(), better KKCC backtrace capabilities, document XD_INLINE_LISP_OBJECT_BLOCK_PTR, fix some memory leaks, other code cleanup
Ben Wing <ben@xemacs.org>
parents:
4976
diff
changeset
|
30 Copyright (C) 2010 Ben Wing. |
| 428 | 31 |
| 32 Permission to use, copy, modify, distribute, and sell this software and | |
| 33 its documentation for any purpose is hereby granted without fee, provided | |
| 34 that (i) the above copyright notices and this permission notice appear in | |
| 35 all copies of the software and related documentation, and (ii) the names of | |
| 36 Sam Leffler and Silicon Graphics may not be used in any advertising or | |
| 37 publicity relating to the software without the specific, prior written | |
| 38 permission of Sam Leffler and Silicon Graphics. */ | |
| 39 | |
| 40 /* Quantizing code based off of the paper | |
| 41 Color Image Quantization for Frame Buffer Display, Paul Heckbert, | |
| 42 Siggraph '82 proceedings, pp. 297-307 */ | |
| 43 | |
| 44 #include <config.h> | |
| 45 #include "lisp.h" | |
| 46 #include "imgproc.h" | |
| 47 | |
| 48 static void | |
| 2367 | 49 get_histogram(quant_table *qt, Binbyte *pic, |
| 428 | 50 int width, int height, Colorbox* box) |
| 51 { | |
| 2367 | 52 register Binbyte *inptr; |
| 428 | 53 register int red, green, blue; |
| 647 | 54 register int j, i; |
| 428 | 55 |
| 56 box->rmin = box->gmin = box->bmin = 999; | |
| 57 box->rmax = box->gmax = box->bmax = -1; | |
| 58 box->total = width * height; | |
| 59 | |
| 60 inptr = pic; | |
| 61 for (i = 0; i < height; i++) | |
| 62 { | |
| 63 for (j = width; j-- > 0;) | |
| 64 { | |
| 65 red = *inptr++ >> COLOR_SHIFT; | |
| 66 green = *inptr++ >> COLOR_SHIFT; | |
| 67 blue = *inptr++ >> COLOR_SHIFT; | |
| 68 if (red < box->rmin) | |
| 69 box->rmin = red; | |
| 70 if (red > box->rmax) | |
| 71 box->rmax = red; | |
| 72 if (green < box->gmin) | |
| 73 box->gmin = green; | |
| 74 if (green > box->gmax) | |
| 75 box->gmax = green; | |
| 76 if (blue < box->bmin) | |
| 77 box->bmin = blue; | |
| 78 if (blue > box->bmax) | |
| 79 box->bmax = blue; | |
| 80 qt->histogram[red][green][blue]++; | |
| 81 } | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 static Colorbox * | |
| 86 largest_box(quant_table *qt) | |
| 87 { | |
| 88 register Colorbox *p, *b; | |
| 89 register int size; | |
| 90 | |
| 91 b = NULL; | |
| 92 size = -1; | |
| 93 for (p = qt->usedboxes; p != NULL; p = p->next) | |
| 94 if ((p->rmax > p->rmin || p->gmax > p->gmin || | |
| 95 p->bmax > p->bmin) && p->total > size) | |
| 96 size = (b = p)->total; | |
| 97 return (b); | |
| 98 } | |
| 99 | |
| 100 static void | |
| 101 shrinkbox(quant_table *qt, Colorbox* box) | |
| 102 { | |
| 103 register int *histp, ir, ig, ib; | |
| 104 | |
| 105 if (box->rmax > box->rmin) | |
| 106 { | |
| 107 for (ir = box->rmin; ir <= box->rmax; ++ir) | |
| 108 for (ig = box->gmin; ig <= box->gmax; ++ig) | |
| 109 { | |
| 110 histp = &(qt->histogram[ir][ig][box->bmin]); | |
| 111 for (ib = box->bmin; ib <= box->bmax; ++ib) | |
| 112 if (*histp++ != 0) | |
| 113 { | |
| 114 box->rmin = ir; | |
| 115 goto have_rmin; | |
| 116 } | |
| 117 } | |
| 118 have_rmin: | |
| 119 if (box->rmax > box->rmin) | |
| 120 for (ir = box->rmax; ir >= box->rmin; --ir) | |
| 121 for (ig = box->gmin; ig <= box->gmax; ++ig) | |
| 122 { | |
| 123 histp = &(qt->histogram[ir][ig][box->bmin]); | |
| 124 ib = box->bmin; | |
| 125 for (; ib <= box->bmax; ++ib) | |
| 126 if (*histp++ != 0) | |
| 127 { | |
| 128 box->rmax = ir; | |
| 129 goto have_rmax; | |
| 130 } | |
| 131 } | |
| 132 } | |
| 133 have_rmax: | |
| 134 if (box->gmax > box->gmin) | |
| 135 { | |
| 136 for (ig = box->gmin; ig <= box->gmax; ++ig) | |
| 137 for (ir = box->rmin; ir <= box->rmax; ++ir) | |
| 138 { | |
| 139 histp = &(qt->histogram[ir][ig][box->bmin]); | |
| 140 for (ib = box->bmin; ib <= box->bmax; ++ib) | |
| 141 if (*histp++ != 0) | |
| 142 { | |
| 143 box->gmin = ig; | |
| 144 goto have_gmin; | |
| 145 } | |
| 146 } | |
| 147 have_gmin: | |
| 148 if (box->gmax > box->gmin) | |
| 149 for (ig = box->gmax; ig >= box->gmin; --ig) | |
| 150 for (ir = box->rmin; ir <= box->rmax; ++ir) | |
| 151 { | |
| 152 histp = &(qt->histogram[ir][ig][box->bmin]); | |
| 153 ib = box->bmin; | |
| 154 for (; ib <= box->bmax; ++ib) | |
| 155 if (*histp++ != 0) | |
| 156 { | |
| 157 box->gmax = ig; | |
| 158 goto have_gmax; | |
| 159 } | |
| 160 } | |
| 161 } | |
| 162 have_gmax: | |
| 163 if (box->bmax > box->bmin) | |
| 164 { | |
| 165 for (ib = box->bmin; ib <= box->bmax; ++ib) | |
| 166 for (ir = box->rmin; ir <= box->rmax; ++ir) | |
| 167 { | |
| 168 histp = &(qt->histogram[ir][box->gmin][ib]); | |
| 169 for (ig = box->gmin; ig <= box->gmax; ++ig) | |
| 170 { | |
| 171 if (*histp != 0) | |
| 172 { | |
| 173 box->bmin = ib; | |
| 174 goto have_bmin; | |
| 175 } | |
| 176 histp += B_LEN; | |
| 177 } | |
| 178 } | |
| 179 have_bmin: | |
| 180 if (box->bmax > box->bmin) | |
| 181 for (ib = box->bmax; ib >= box->bmin; --ib) | |
| 182 for (ir = box->rmin; ir <= box->rmax; ++ir) | |
| 183 { | |
| 184 histp = &(qt->histogram[ir][box->gmin][ib]); | |
| 185 ig = box->gmin; | |
| 186 for (; ig <= box->gmax; ++ig) | |
| 187 { | |
| 188 if (*histp != 0) | |
| 189 { | |
| 190 box->bmax = ib; | |
| 191 goto have_bmax; | |
| 192 } | |
| 193 histp += B_LEN; | |
| 194 } | |
| 195 } | |
| 196 } | |
| 197 have_bmax: | |
| 198 ; | |
| 199 } | |
| 200 | |
| 201 static void | |
| 202 splitbox(quant_table *qt, Colorbox* ptr) | |
| 203 { | |
| 204 int hist2[B_LEN]; | |
| 205 int first = 0, last = 0; | |
| 3025 | 206 register Colorbox *new_; |
| 428 | 207 register int *iptr, *histp; |
| 208 register int i, j; | |
| 209 register int ir,ig,ib; | |
| 210 register int sum, sum1, sum2; | |
| 211 enum { RED, GREEN, BLUE } axis; | |
| 212 | |
| 213 /* | |
| 214 * See which axis is the largest, do a histogram along that | |
| 215 * axis. Split at median point. Contract both new boxes to | |
| 216 * fit points and return | |
| 217 */ | |
| 218 i = ptr->rmax - ptr->rmin; | |
| 219 if (i >= ptr->gmax - ptr->gmin && i >= ptr->bmax - ptr->bmin) | |
| 220 axis = RED; | |
| 221 else if (ptr->gmax - ptr->gmin >= ptr->bmax - ptr->bmin) | |
| 222 axis = GREEN; | |
| 223 else | |
| 224 axis = BLUE; | |
| 225 /* get histogram along longest axis */ | |
| 226 switch (axis) | |
| 227 { | |
| 228 case RED: | |
| 229 histp = &hist2[ptr->rmin]; | |
| 230 for (ir = ptr->rmin; ir <= ptr->rmax; ++ir) | |
| 231 { | |
| 232 *histp = 0; | |
| 233 for (ig = ptr->gmin; ig <= ptr->gmax; ++ig) | |
| 234 { | |
| 235 iptr = &(qt->histogram[ir][ig][ptr->bmin]); | |
| 236 for (ib = ptr->bmin; ib <= ptr->bmax; ++ib) | |
| 237 *histp += *iptr++; | |
| 238 } | |
| 239 histp++; | |
| 240 } | |
| 241 first = ptr->rmin; | |
| 242 last = ptr->rmax; | |
| 243 break; | |
| 244 case GREEN: | |
| 245 histp = &hist2[ptr->gmin]; | |
| 246 for (ig = ptr->gmin; ig <= ptr->gmax; ++ig) | |
| 247 { | |
| 248 *histp = 0; | |
| 249 for (ir = ptr->rmin; ir <= ptr->rmax; ++ir) | |
| 250 { | |
| 251 iptr = &(qt->histogram[ir][ig][ptr->bmin]); | |
| 252 for (ib = ptr->bmin; ib <= ptr->bmax; ++ib) | |
| 253 *histp += *iptr++; | |
| 254 } | |
| 255 histp++; | |
| 256 } | |
| 257 first = ptr->gmin; | |
| 258 last = ptr->gmax; | |
| 259 break; | |
| 260 case BLUE: | |
| 261 histp = &hist2[ptr->bmin]; | |
| 262 for (ib = ptr->bmin; ib <= ptr->bmax; ++ib) | |
| 263 { | |
| 264 *histp = 0; | |
| 265 for (ir = ptr->rmin; ir <= ptr->rmax; ++ir) | |
| 266 { | |
| 267 iptr = &(qt->histogram[ir][ptr->gmin][ib]); | |
| 268 for (ig = ptr->gmin; ig <= ptr->gmax; ++ig) | |
| 269 { | |
| 270 *histp += *iptr; | |
| 271 iptr += B_LEN; | |
| 272 } | |
| 273 } | |
| 274 histp++; | |
| 275 } | |
| 276 first = ptr->bmin; | |
| 277 last = ptr->bmax; | |
| 278 break; | |
| 279 } | |
| 280 /* find median point */ | |
| 281 sum2 = ptr->total / 2; | |
| 282 histp = &hist2[first]; | |
| 283 sum = 0; | |
| 284 for (i = first; i <= last && (sum += *histp++) < sum2; ++i) | |
| 285 ; | |
| 286 if (i == first) | |
| 287 i++; | |
| 288 | |
| 289 /* Create new box, re-allocate points */ | |
| 3025 | 290 new_ = qt->freeboxes; |
| 291 qt->freeboxes = new_->next; | |
| 428 | 292 if (qt->freeboxes) |
| 293 qt->freeboxes->prev = NULL; | |
| 294 if (qt->usedboxes) | |
| 3025 | 295 qt->usedboxes->prev = new_; |
| 296 new_->next = qt->usedboxes; | |
| 297 qt->usedboxes = new_; | |
| 428 | 298 |
| 299 histp = &hist2[first]; | |
| 300 for (sum1 = 0, j = first; j < i; j++) | |
| 301 sum1 += *histp++; | |
| 302 for (sum2 = 0, j = i; j <= last; j++) | |
| 303 sum2 += *histp++; | |
| 3025 | 304 new_->total = sum1; |
| 428 | 305 ptr->total = sum2; |
| 306 | |
| 3025 | 307 new_->rmin = ptr->rmin; |
| 308 new_->rmax = ptr->rmax; | |
| 309 new_->gmin = ptr->gmin; | |
| 310 new_->gmax = ptr->gmax; | |
| 311 new_->bmin = ptr->bmin; | |
| 312 new_->bmax = ptr->bmax; | |
| 428 | 313 switch (axis) |
| 314 { | |
| 315 case RED: | |
| 3025 | 316 new_->rmax = i-1; |
| 428 | 317 ptr->rmin = i; |
| 318 break; | |
| 319 case GREEN: | |
| 3025 | 320 new_->gmax = i-1; |
| 428 | 321 ptr->gmin = i; |
| 322 break; | |
| 323 case BLUE: | |
| 3025 | 324 new_->bmax = i-1; |
| 428 | 325 ptr->bmin = i; |
| 326 break; | |
| 327 } | |
| 3025 | 328 shrinkbox (qt, new_); |
| 428 | 329 shrinkbox (qt, ptr); |
| 330 } | |
| 331 | |
| 332 | |
| 333 static C_cell * | |
| 334 create_colorcell(quant_table *qt, int num_colors, int red, int green, int blue) | |
| 335 { | |
| 336 register int ir, ig, ib, i; | |
| 337 register C_cell *ptr; | |
| 338 int mindist, next_n; | |
| 339 register int tmp, dist, n; | |
| 340 | |
| 341 ir = red >> (COLOR_DEPTH-C_DEPTH); | |
| 342 ig = green >> (COLOR_DEPTH-C_DEPTH); | |
| 343 ib = blue >> (COLOR_DEPTH-C_DEPTH); | |
| 2367 | 344 ptr = xnew (C_cell); |
| 428 | 345 *(qt->ColorCells + ir*C_LEN*C_LEN + ig*C_LEN + ib) = ptr; |
| 346 ptr->num_ents = 0; | |
| 347 | |
| 348 /* | |
| 349 * Step 1: find all colors inside this cell, while we're at | |
| 350 * it, find distance of centermost point to furthest corner | |
| 351 */ | |
| 352 mindist = 99999999; | |
| 353 for (i = 0; i < num_colors; ++i) | |
| 354 { | |
| 355 if (qt->rm[i]>>(COLOR_DEPTH-C_DEPTH) != ir || | |
| 356 qt->gm[i]>>(COLOR_DEPTH-C_DEPTH) != ig || | |
| 357 qt->bm[i]>>(COLOR_DEPTH-C_DEPTH) != ib) | |
| 358 continue; | |
| 359 ptr->entries[ptr->num_ents][0] = i; | |
| 360 ptr->entries[ptr->num_ents][1] = 0; | |
| 361 ++ptr->num_ents; | |
| 362 tmp = qt->rm[i] - red; | |
| 363 if (tmp < (MAX_COLOR/C_LEN/2)) | |
| 364 tmp = MAX_COLOR/C_LEN-1 - tmp; | |
| 365 dist = tmp*tmp; | |
| 366 tmp = qt->gm[i] - green; | |
| 367 if (tmp < (MAX_COLOR/C_LEN/2)) | |
| 368 tmp = MAX_COLOR/C_LEN-1 - tmp; | |
| 369 dist += tmp*tmp; | |
| 370 tmp = qt->bm[i] - blue; | |
| 371 if (tmp < (MAX_COLOR/C_LEN/2)) | |
| 372 tmp = MAX_COLOR/C_LEN-1 - tmp; | |
| 373 dist += tmp*tmp; | |
| 374 if (dist < mindist) | |
| 375 mindist = dist; | |
| 376 } | |
| 377 | |
| 378 /* | |
| 379 * Step 3: find all points within that distance to cell. | |
| 380 */ | |
| 381 for (i = 0; i < num_colors; ++i) | |
| 382 { | |
| 383 if (qt->rm[i] >> (COLOR_DEPTH-C_DEPTH) == ir && | |
| 384 qt->gm[i] >> (COLOR_DEPTH-C_DEPTH) == ig && | |
| 385 qt->bm[i] >> (COLOR_DEPTH-C_DEPTH) == ib) | |
| 386 continue; | |
| 387 dist = 0; | |
| 388 if ((tmp = red - qt->rm[i]) > 0 || | |
| 389 (tmp = qt->rm[i] - (red + MAX_COLOR/C_LEN-1)) > 0 ) | |
| 390 dist += tmp*tmp; | |
| 391 if ((tmp = green - qt->gm[i]) > 0 || | |
| 392 (tmp = qt->gm[i] - (green + MAX_COLOR/C_LEN-1)) > 0 ) | |
| 393 dist += tmp*tmp; | |
| 394 if ((tmp = blue - qt->bm[i]) > 0 || | |
| 395 (tmp = qt->bm[i] - (blue + MAX_COLOR/C_LEN-1)) > 0 ) | |
| 396 dist += tmp*tmp; | |
| 397 if (dist < mindist) | |
| 398 { | |
| 399 ptr->entries[ptr->num_ents][0] = i; | |
| 400 ptr->entries[ptr->num_ents][1] = dist; | |
| 401 ++ptr->num_ents; | |
| 402 } | |
| 403 } | |
| 404 | |
| 405 /* | |
| 406 * Sort color cells by distance, use cheap exchange sort | |
| 407 */ | |
| 408 for (n = ptr->num_ents - 1; n > 0; n = next_n) | |
| 409 { | |
| 410 next_n = 0; | |
| 411 for (i = 0; i < n; ++i) | |
| 412 if (ptr->entries[i][1] > ptr->entries[i+1][1]) | |
| 413 { | |
| 414 tmp = ptr->entries[i][0]; | |
| 415 ptr->entries[i][0] = ptr->entries[i+1][0]; | |
| 416 ptr->entries[i+1][0] = tmp; | |
| 417 tmp = ptr->entries[i][1]; | |
| 418 ptr->entries[i][1] = ptr->entries[i+1][1]; | |
| 419 ptr->entries[i+1][1] = tmp; | |
| 420 next_n = i; | |
| 421 } | |
| 422 } | |
| 423 return (ptr); | |
| 424 } | |
| 425 | |
| 426 static int | |
| 427 map_colortable(quant_table *qt, int num_colors) | |
| 428 { | |
| 429 register int *histp = &(qt->histogram[0][0][0]); | |
| 430 register C_cell *cell; | |
| 431 register int j, tmp, d2, dist; | |
| 432 int ir, ig, ib, i; | |
| 433 | |
| 434 for (ir = 0; ir < B_LEN; ++ir) | |
| 435 for (ig = 0; ig < B_LEN; ++ig) | |
| 436 for (ib = 0; ib < B_LEN; ++ib, histp++) | |
| 437 { | |
| 438 if (*histp == 0) | |
| 439 { | |
| 440 *histp = -1; | |
| 441 continue; | |
| 442 } | |
| 443 cell = *(qt->ColorCells + | |
| 444 (((ir>>(B_DEPTH-C_DEPTH)) << C_DEPTH*2) + | |
| 445 ((ig>>(B_DEPTH-C_DEPTH)) << C_DEPTH) + | |
| 446 (ib>>(B_DEPTH-C_DEPTH)))); | |
| 447 if (cell == NULL ) | |
| 448 cell = create_colorcell (qt, num_colors, | |
| 449 ir << COLOR_SHIFT, | |
| 450 ig << COLOR_SHIFT, | |
| 451 ib << COLOR_SHIFT); | |
| 452 if (cell == NULL) /* memory exhausted! punt! */ | |
| 453 return -1; | |
| 454 dist = 9999999; | |
| 455 for (i = 0; i < cell->num_ents && | |
| 456 dist > cell->entries[i][1]; ++i) | |
| 457 { | |
| 458 j = cell->entries[i][0]; | |
| 459 d2 = qt->rm[j] - (ir << COLOR_SHIFT); | |
| 460 d2 *= d2; | |
| 461 tmp = qt->gm[j] - (ig << COLOR_SHIFT); | |
| 462 d2 += tmp*tmp; | |
| 463 tmp = qt->bm[j] - (ib << COLOR_SHIFT); | |
| 464 d2 += tmp*tmp; | |
| 465 if (d2 < dist) | |
| 466 { | |
| 467 dist = d2; | |
| 468 *histp = j; | |
| 469 } | |
| 470 } | |
| 471 } | |
| 472 return 0; | |
| 473 } | |
| 474 | |
| 475 quant_table * | |
| 2367 | 476 build_EImage_quantable(Binbyte *eimage, int width, int height, int num_colors) |
| 428 | 477 { |
| 478 quant_table *qt; | |
| 479 Colorbox *box_list, *ptr; | |
| 480 int i,res; | |
| 481 | |
| 482 qt = (quant_table*)xmalloc_and_zero (sizeof(quant_table)); | |
| 483 if (qt == NULL) return NULL; | |
| 484 | |
| 485 assert (num_colors < 257 && num_colors > 2); | |
| 486 /* | |
| 487 * STEP 1: create empty boxes | |
| 488 */ | |
| 489 qt->usedboxes = NULL; | |
| 2367 | 490 box_list = qt->freeboxes = xnew_array (Colorbox, num_colors); |
| 428 | 491 qt->freeboxes[0].next = &(qt->freeboxes[1]); |
| 492 qt->freeboxes[0].prev = NULL; | |
| 493 for (i = 1; i < num_colors-1; ++i) | |
| 494 { | |
| 495 qt->freeboxes[i].next = &(qt->freeboxes[i+1]); | |
| 496 qt->freeboxes[i].prev = &(qt->freeboxes[i-1]); | |
| 497 } | |
| 498 qt->freeboxes[num_colors-1].next = NULL; | |
| 499 qt->freeboxes[num_colors-1].prev = &(qt->freeboxes[num_colors-2]); | |
| 500 | |
| 501 /* | |
| 502 * STEP 2: get histogram, initialize first box | |
| 503 */ | |
| 504 ptr = qt->freeboxes; | |
| 505 qt->freeboxes = ptr->next; | |
| 506 if (qt->freeboxes) | |
| 507 qt->freeboxes->prev = NULL; | |
| 508 ptr->next = qt->usedboxes; | |
| 509 qt->usedboxes = ptr; | |
| 510 if (ptr->next) | |
| 511 ptr->next->prev = ptr; | |
| 512 get_histogram (qt, eimage, width, height, ptr); | |
| 513 | |
| 514 /* | |
| 515 * STEP 3: continually subdivide boxes until no more free | |
| 516 * boxes remain or until all colors assigned. | |
| 517 */ | |
| 518 while (qt->freeboxes != NULL) | |
| 519 { | |
| 520 ptr = largest_box(qt); | |
| 521 if (ptr != NULL) | |
| 522 splitbox (qt, ptr); | |
| 523 else | |
| 524 qt->freeboxes = NULL; | |
| 525 } | |
| 526 | |
| 527 /* | |
| 528 * STEP 4: assign colors to all boxes | |
| 529 */ | |
| 530 for (i = 0, ptr = qt->usedboxes; ptr != NULL; ++i, ptr = ptr->next) | |
| 531 { | |
| 532 qt->rm[i] = ((ptr->rmin + ptr->rmax) << COLOR_SHIFT) / 2; | |
| 533 qt->gm[i] = ((ptr->gmin + ptr->gmax) << COLOR_SHIFT) / 2; | |
| 534 qt->bm[i] = ((ptr->bmin + ptr->bmax) << COLOR_SHIFT) / 2; | |
| 535 qt->um[i] = ptr->total; | |
| 536 } | |
| 537 qt->num_active_colors = i; | |
| 538 | |
| 539 /* We're done with the boxes now */ | |
|
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540 xfree (box_list); |
| 428 | 541 qt->freeboxes = qt->usedboxes = NULL; |
| 542 | |
| 543 /* | |
| 544 * STEP 5: scan histogram and map all values to closest color | |
| 545 */ | |
| 546 /* 5a: create cell list as described in Heckbert */ | |
| 547 qt->ColorCells = (C_cell **)xmalloc_and_zero (C_LEN*C_LEN*C_LEN*sizeof (C_cell*)); | |
| 548 /* 5b: create mapping from truncated pixel space to color | |
| 549 table entries */ | |
| 550 res = map_colortable (qt, num_colors); | |
| 551 | |
| 552 /* 5c: done with ColorCells */ | |
| 553 for (i = 0; i < C_LEN*C_LEN*C_LEN; i++) | |
| 1726 | 554 if (qt->ColorCells[i]) |
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555 { |
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556 xfree (qt->ColorCells[i]); |
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557 qt->ColorCells[i] = 0; |
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6c6d78781d59
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Ben Wing <ben@xemacs.org>
parents:
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558 } |
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parents:
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diff
changeset
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559 xfree (qt->ColorCells); |
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Ben Wing <ben@xemacs.org>
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changeset
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560 qt->ColorCells = 0; |
| 428 | 561 |
| 562 if (res) | |
| 563 { | |
| 1726 | 564 /* we failed in memory allocation, so clean up and leave */ |
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parents:
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diff
changeset
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565 xfree (qt); |
| 428 | 566 return NULL; |
| 567 } | |
| 568 | |
| 569 return qt; | |
| 570 } |