granicus.if.org Git - imagemagick/blob - magick/list.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                         L      IIIII  SSSSS  TTTTT                          %
   7 %                         L        I    SS       T                            %
   8 %                         L        I     SSS     T                            %
   9 %                         L        I       SS    T                            %
  10 %                         LLLLL  IIIII  SSSSS    T                            %
  11 %                                                                             %
  12 %                                                                             %
  13 %                        MagickCore Image List Methods                        %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                               December 2002                                 %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2011 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 %
  38 */
  39 \f
  40 /*
  41   Include declarations.
  42 */
  43 #include "magick/studio.h"
  44 #include "magick/blob.h"
  45 #include "magick/blob-private.h"
  46 #include "magick/exception.h"
  47 #include "magick/exception-private.h"
  48 #include "magick/list.h"
  49 #include "magick/memory_.h"
  50 #include "magick/string_.h"
  51 \f
  52 /*
  53 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  54 %                                                                             %
  55 %                                                                             %
  56 %                                                                             %
  57 %   A p p e n d I m a g e T o L i s t                                         %
  58 %                                                                             %
  59 %                                                                             %
  60 %                                                                             %
  61 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  62 %
  63 %  AppendImageToList() appends the second image list to the end of the first
  64 %  list.  The given image list pointer is left unchanged, unless it was empty.
  65 %
  66 %  The format of the AppendImageToList method is:
  67 %
  68 %      AppendImageToList(Image *images,const Image *image)
  69 %
  70 %  A description of each parameter follows:
  71 %
  72 %    o images: the image list to be appended to.
  73 %
  74 %    o image: the appended image or image list.
  75 %
  76 */
  77 MagickExport void AppendImageToList(Image **images,const Image *image)
  78 {
  79   register Image
  80     *p,
  81     *q;
  82
  83   assert(images != (Image **) NULL);
  84   if (image == (Image *) NULL)
  85     return;
  86   assert(image->signature == MagickSignature);
  87   if (image->debug != MagickFalse)
  88     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
  89   if ((*images) == (Image *) NULL)
  90     {
  91       *images=(Image *) image;
  92       return;
  93     }
  94   assert((*images)->signature == MagickSignature);
  95   p=GetLastImageInList(*images);
  96   q=GetFirstImageInList(image);
  97   p->next=q;
  98   q->previous=p;
  99 }
 100 \f
 101 /*
 102 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 103 %                                                                             %
 104 %                                                                             %
 105 %                                                                             %
 106 %   C l o n e I m a g e L i s t                                               %
 107 %                                                                             %
 108 %                                                                             %
 109 %                                                                             %
 110 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 111 %
 112 %  CloneImageList() returns a duplicate of the image list.
 113 %
 114 %  The format of the CloneImageList method is:
 115 %
 116 %      Image *CloneImageList(const Image *images,ExceptionInfo *exception)
 117 %
 118 %  A description of each parameter follows:
 119 %
 120 %    o images: the image list.
 121 %
 122 %    o exception: return any errors or warnings in this structure.
 123 %
 124 */
 125 MagickExport Image *CloneImageList(const Image *images,ExceptionInfo *exception)
 126 {
 127   Image
 128     *clone,
 129     *image;
 130
 131   register Image
 132     *p;
 133
 134   if (images == (Image *) NULL)
 135     return((Image *) NULL);
 136   assert(images->signature == MagickSignature);
 137   while (images->previous != (Image *) NULL)
 138     images=images->previous;
 139   image=(Image *) NULL;
 140   for (p=(Image *) NULL; images != (Image *) NULL; images=images->next)
 141   {
 142     clone=CloneImage(images,0,0,MagickTrue,exception);
 143     if (clone == (Image *) NULL)
 144       {
 145         if (image != (Image *) NULL)
 146           image=DestroyImageList(image);
 147         return((Image *) NULL);
 148       }
 149     if (image == (Image *) NULL)
 150       {
 151         image=clone;
 152         p=image;
 153         continue;
 154       }
 155     p->next=clone;
 156     clone->previous=p;
 157     p=p->next;
 158   }
 159   return(image);
 160 }
 161 \f
 162 /*
 163 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 164 %                                                                             %
 165 %                                                                             %
 166 %                                                                             %
 167 %   C l o n e I m a g e s                                                     %
 168 %                                                                             %
 169 %                                                                             %
 170 %                                                                             %
 171 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 172 %
 173 %  CloneImages() clones one or more images from an image sequence, using a
 174 %  comma separated list of image numbers or ranges.
 175 %
 176 %  The numbers start at 0 for the first image in the list, while negative
 177 %  numbers refer to images starting counting from the end of the range. Images
 178 %  may be refered to multiple times to clone them multiple times. Images
 179 %  refered beyond the available number of images in list are ignored.
 180 %
 181 %  Images referenced may be reversed, and results in a clone of those images
 182 %  also being made with a reversed order.
 183 %
 184 %  The format of the CloneImages method is:
 185 %
 186 %      Image *CloneImages(const Image *images,const char *scenes,
 187 %        ExceptionInfo *exception)
 188 %
 189 %  A description of each parameter follows:
 190 %
 191 %    o images: the image sequence.
 192 %
 193 %    o scenes: This character string specifies which scenes to clone
 194 %      (e.g. 1,3-5,7-3,2).
 195 %
 196 %    o exception: return any errors or warnings in this structure.
 197 %
 198 */
 199 MagickExport Image *CloneImages(const Image *images,const char *scenes,
 200   ExceptionInfo *exception)
 201 {
 202   char
 203     *p;
 204
 205   const Image
 206     *next;
 207
 208   Image
 209     *clone_images,
 210     *image;
 211
 212   long
 213     first,
 214     last,
 215     step;
 216
 217   register ssize_t
 218     i;
 219
 220   size_t
 221     length;
 222
 223   assert(images != (const Image *) NULL);
 224   assert(images->signature == MagickSignature);
 225   assert(scenes != (char *) NULL);
 226   if (images->debug != MagickFalse)
 227     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",images->filename);
 228   assert(exception != (ExceptionInfo *) NULL);
 229   assert(exception->signature == MagickSignature);
 230   clone_images=NewImageList();
 231   images=GetFirstImageInList(images);
 232   length=GetImageListLength(images);
 233   for (p=(char *) scenes; *p != '\0';)
 234   {
 235     while ((isspace((int) ((unsigned char) *p)) != 0) || (*p == ','))
 236       p++;
 237     first=strtol(p,&p,10);
 238     if (first < 0)
 239       first+=(long) length;
 240     last=first;
 241     while (isspace((int) ((unsigned char) *p)) != 0)
 242       p++;
 243     if (*p == '-')
 244       {
 245         last=strtol(p+1,&p,10);
 246         if (last < 0)
 247           last+=(long) length;
 248       }
 249     for (step=first > last ? -1 : 1; first != (last+step); first+=step)
 250     {
 251       i=0;
 252       for (next=images; next != (Image *) NULL; next=GetNextImageInList(next))
 253       {
 254         if (i == (ssize_t) first)
 255           {
 256             image=CloneImage(next,0,0,MagickTrue,exception);
 257             if (image == (Image *) NULL)
 258               break;
 259             AppendImageToList(&clone_images,image);
 260           }
 261         i++;
 262       }
 263     }
 264   }
 265   return(GetFirstImageInList(clone_images));
 266 }
 267 \f
 268 /*
 269 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 270 %                                                                             %
 271 %                                                                             %
 272 %                                                                             %
 273 %   D e l e t e I m a g e F r o m L i s t                                     %
 274 %                                                                             %
 275 %                                                                             %
 276 %                                                                             %
 277 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 278 %
 279 %  DeleteImageFromList() deletes an image from the list. List pointer
 280 %  is moved to the next image, if one is present. See RemoveImageFromList().
 281 %
 282 %  The format of the DeleteImageFromList method is:
 283 %
 284 %      DeleteImageFromList(Image **images)
 285 %
 286 %  A description of each parameter follows:
 287 %
 288 %    o images: the image list.
 289 %
 290 */
 291 MagickExport void DeleteImageFromList(Image **images)
 292 {
 293   Image
 294     *image;
 295
 296   image=RemoveImageFromList(images);
 297   if (image != (Image *) NULL)
 298     (void) DestroyImage(image);
 299 }
 300 \f
 301 /*
 302 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 303 %                                                                             %
 304 %                                                                             %
 305 %                                                                             %
 306 %   D e l e t e I m a g e s                                                   %
 307 %                                                                             %
 308 %                                                                             %
 309 %                                                                             %
 310 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 311 %
 312 %  DeleteImages() deletes one or more images from an image sequence, using a
 313 %  comma separated list of image numbers or ranges.
 314 %
 315 %  The numbers start at 0 for the first image, while negative numbers refer to
 316 %  images starting counting from the end of the range. Images may be refered to
 317 %  multiple times without problems. Image refered beyond the available number
 318 %  of images in list are ignored.
 319 %
 320 %  If the referenced images are in the reverse order, that range will be
 321 %  completely ignored.  Unlike CloneImages().
 322 %
 323 %  The format of the DeleteImages method is:
 324 %
 325 %      DeleteImages(Image **images,const char *scenes,ExceptionInfo *exception)
 326 %
 327 %  A description of each parameter follows:
 328 %
 329 %    o images: the image sequence.
 330 %
 331 %    o scenes: This character string specifies which scenes to delete
 332 %      (e.g. 1,3-5,-2-6,2).
 333 %
 334 %    o exception: return any errors or warnings in this structure.
 335 %
 336 */
 337 MagickExport void DeleteImages(Image **images,const char *scenes,
 338   ExceptionInfo *exception)
 339 {
 340   char
 341     *p;
 342
 343   Image
 344     *image;
 345
 346   long
 347     first,
 348     last;
 349
 350   MagickBooleanType
 351     *delete_list;
 352
 353   register ssize_t
 354     i;
 355
 356   size_t
 357     length;
 358
 359   assert(images != (Image **) NULL);
 360   assert((*images)->signature == MagickSignature);
 361   assert(scenes != (char *) NULL);
 362   if ((*images)->debug != MagickFalse)
 363     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 364       (*images)->filename);
 365   assert(exception != (ExceptionInfo *) NULL);
 366   assert(exception->signature == MagickSignature);
 367   *images=GetFirstImageInList(*images);
 368   length=GetImageListLength(*images);
 369   delete_list=(MagickBooleanType *) AcquireQuantumMemory(length,
 370     sizeof(*delete_list));
 371   if (delete_list == (MagickBooleanType *) NULL)
 372     {
 373       (void) ThrowMagickException(exception,GetMagickModule(),
 374         ResourceLimitError,"MemoryAllocationFailed","`%s'",(*images)->filename);
 375       return;
 376     }
 377   image=(*images);
 378   for (i=0; i < (ssize_t) length; i++)
 379     delete_list[i]=MagickFalse;
 380   /*
 381     Note which images will be deleted, avoid duplicate deleted
 382   */
 383   for (p=(char *) scenes; *p != '\0';)
 384   {
 385     while ((isspace((int)*p) != 0) || (*p == ','))
 386       p++;
 387     first=strtol(p,&p,10);
 388     if (first < 0)
 389       first+=(long) length;
 390     last=first;
 391     while (isspace((int) ((unsigned char) *p)) != 0)
 392       p++;
 393     if (*p == '-')
 394       {
 395         last=strtol(p+1,&p,10);
 396         if (last < 0)
 397           last+=(long) length;
 398       }
 399     if (first > last)
 400       continue;
 401     for (i=(ssize_t) first; i <= (ssize_t) last; i++)
 402       if ((i >= 0) && (i < (ssize_t) length))
 403         delete_list[i]=MagickTrue;
 404   }
 405   /*
 406     Delete images marked for deletion, once only
 407   */
 408   image=(*images);
 409   for (i=0; i < (ssize_t) length; i++)
 410   {
 411     *images=image;
 412     image=GetNextImageInList(image);
 413     if (delete_list[i] != MagickFalse)
 414       DeleteImageFromList(images);
 415
 416   }
 417   (void) RelinquishMagickMemory(delete_list);
 418   *images=GetFirstImageInList(*images);
 419 }
 420 \f
 421 /*
 422 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 423 %                                                                             %
 424 %                                                                             %
 425 %                                                                             %
 426 %   D e s t r o y I m a g e L i s t                                           %
 427 %                                                                             %
 428 %                                                                             %
 429 %                                                                             %
 430 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 431 %
 432 %  DestroyImageList() destroys an image list.
 433 %
 434 %  The format of the DestroyImageList method is:
 435 %
 436 %      Image *DestroyImageList(Image *image)
 437 %
 438 %  A description of each parameter follows:
 439 %
 440 %    o image: the image sequence.
 441 %
 442 */
 443 MagickExport Image *DestroyImageList(Image *images)
 444 {
 445   if (images == (Image *) NULL)
 446     return((Image *) NULL);
 447   assert(images->signature == MagickSignature);
 448   if (images->debug != MagickFalse)
 449     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",images->filename);
 450   while (images != (Image *) NULL)
 451     DeleteImageFromList(&images);
 452   return((Image *) NULL);
 453 }
 454 \f
 455 /*
 456 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 457 %                                                                             %
 458 %                                                                             %
 459 %                                                                             %
 460 %   G e t F i r s t I m a g e I n L i s t                                     %
 461 %                                                                             %
 462 %                                                                             %
 463 %                                                                             %
 464 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 465 %
 466 %  GetFirstImageInList() returns a pointer to the first image in the list.
 467 %
 468 %  The format of the GetFirstImageInList method is:
 469 %
 470 %      Image *GetFirstImageInList(const Image *images)
 471 %
 472 %  A description of each parameter follows:
 473 %
 474 %    o images: the image list.
 475 %
 476 */
 477 MagickExport Image *GetFirstImageInList(const Image *images)
 478 {
 479   register const Image
 480     *p;
 481
 482   if (images == (Image *) NULL)
 483     return((Image *) NULL);
 484   assert(images->signature == MagickSignature);
 485   for (p=images; p->previous != (Image *) NULL; p=p->previous) ;
 486   return((Image *) p);
 487 }
 488 \f
 489 /*
 490 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 491 %                                                                             %
 492 %                                                                             %
 493 %                                                                             %
 494 %   G e t I m a g e F r o m L i s t                                           %
 495 %                                                                             %
 496 %                                                                             %
 497 %                                                                             %
 498 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 499 %
 500 %  GetImageFromList() returns an image at the specified offset from the list.
 501 %
 502 %  The format of the GetImageFromList method is:
 503 %
 504 %      Image *GetImageFromList(const Image *images,const ssize_t index)
 505 %
 506 %  A description of each parameter follows:
 507 %
 508 %    o images: the image list.
 509 %
 510 %    o index: the position within the list.
 511 %
 512 */
 513 MagickExport Image *GetImageFromList(const Image *images,const ssize_t index)
 514 {
 515   ssize_t
 516     offset;
 517
 518   register const Image
 519     *p;
 520
 521   register ssize_t
 522     i;
 523
 524   size_t
 525     length;
 526
 527   if (images == (Image *) NULL)
 528     return((Image *) NULL);
 529   assert(images->signature == MagickSignature);
 530   if (images->debug != MagickFalse)
 531     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",images->filename);
 532   for (p=images; p->previous != (Image *) NULL; p=p->previous) ;
 533   length=GetImageListLength(images);
 534   for (offset=index; offset < 0; offset+=(ssize_t) length) ;
 535   for (i=0; p != (Image *) NULL; p=p->next)
 536     if (i++ == (ssize_t) (offset % length))
 537       break;
 538   if (p == (Image *) NULL)
 539     return((Image *) NULL);
 540   return((Image *) p);
 541 }
 542 \f
 543 /*
 544 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 545 %                                                                             %
 546 %                                                                             %
 547 %                                                                             %
 548 %   G e t I m a g e I n d e x I n L i s t                                     %
 549 %                                                                             %
 550 %                                                                             %
 551 %                                                                             %
 552 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 553 %
 554 %  GetImageIndexInList() returns the offset in the list of the specified image.
 555 %
 556 %  The format of the GetImageIndexInList method is:
 557 %
 558 %      ssize_t GetImageIndexInList(const Image *images)
 559 %
 560 %  A description of each parameter follows:
 561 %
 562 %    o images: the image list.
 563 %
 564 */
 565 MagickExport ssize_t GetImageIndexInList(const Image *images)
 566 {
 567   register ssize_t
 568     i;
 569
 570   if (images == (const Image *) NULL)
 571     return(-1);
 572   assert(images->signature == MagickSignature);
 573   for (i=0; images->previous != (Image *) NULL; i++)
 574     images=images->previous;
 575   return(i);
 576 }
 577 \f
 578 /*
 579 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 580 %                                                                             %
 581 %                                                                             %
 582 %                                                                             %
 583 %   G e t I m a g e L i s t L e n g t h                                       %
 584 %                                                                             %
 585 %                                                                             %
 586 %                                                                             %
 587 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 588 %
 589 %  GetImageListLength() returns the length of the list (the number of images in
 590 %  the list).
 591 %
 592 %  The format of the GetImageListLength method is:
 593 %
 594 %      size_t GetImageListLength(const Image *images)
 595 %
 596 %  A description of each parameter follows:
 597 %
 598 %    o images: the image list.
 599 %
 600 */
 601 MagickExport size_t GetImageListLength(const Image *images)
 602 {
 603   register ssize_t
 604     i;
 605
 606   if (images == (Image *) NULL)
 607     return(0);
 608   assert(images->signature == MagickSignature);
 609   if (images->debug != MagickFalse)
 610     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",images->filename);
 611   while (images->previous != (Image *) NULL)
 612     images=images->previous;
 613   for (i=0; images != (Image *) NULL; images=images->next)
 614     i++;
 615   return((size_t) i);
 616 }
 617 \f
 618 /*
 619 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 620 %                                                                             %
 621 %                                                                             %
 622 %                                                                             %
 623 %   G e t L a s t I m a g e I n L i s t                                       %
 624 %                                                                             %
 625 %                                                                             %
 626 %                                                                             %
 627 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 628 %
 629 %  GetLastImageInList() returns a pointer to the last image in the list.
 630 %
 631 %  The format of the GetLastImageInList method is:
 632 %
 633 %      Image *GetLastImageInList(const Image *images)
 634 %
 635 %  A description of each parameter follows:
 636 %
 637 %    o images: the image list.
 638 %
 639 */
 640 MagickExport Image *GetLastImageInList(const Image *images)
 641 {
 642   register const Image
 643     *p;
 644
 645   if (images == (Image *) NULL)
 646     return((Image *) NULL);
 647   assert(images->signature == MagickSignature);
 648   for (p=images; p->next != (Image *) NULL; p=p->next) ;
 649   return((Image *) p);
 650 }
 651 \f
 652 /*
 653 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 654 %                                                                             %
 655 %                                                                             %
 656 %                                                                             %
 657 %   G e t N e x t I m a g e I n L i s t                                       %
 658 %                                                                             %
 659 %                                                                             %
 660 %                                                                             %
 661 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 662 %
 663 %  GetNextImageInList() returns the next image in the list.
 664 %
 665 %  The format of the GetNextImageInList method is:
 666 %
 667 %      Image *GetNextImageInList(const Image *images)
 668 %
 669 %  A description of each parameter follows:
 670 %
 671 %    o images: the image list.
 672 %
 673 */
 674 MagickExport Image *GetNextImageInList(const Image *images)
 675 {
 676   if (images == (Image *) NULL)
 677     return((Image *) NULL);
 678   assert(images->signature == MagickSignature);
 679   if (images->debug != MagickFalse)
 680     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",images->filename);
 681   return(images->next);
 682 }
 683 \f
 684 /*
 685 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 686 %                                                                             %
 687 %                                                                             %
 688 %                                                                             %
 689 %   G e t P r e v i o u s I m a g e I n L i s t                               %
 690 %                                                                             %
 691 %                                                                             %
 692 %                                                                             %
 693 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 694 %
 695 %  GetPreviousImageInList() returns the previous image in the list.
 696 %
 697 %  The format of the GetPreviousImageInList method is:
 698 %
 699 %      Image *GetPreviousImageInList(const Image *images)
 700 %
 701 %  A description of each parameter follows:
 702 %
 703 %    o images: the image list.
 704 %
 705 */
 706 MagickExport Image *GetPreviousImageInList(const Image *images)
 707 {
 708   if (images == (Image *) NULL)
 709     return((Image *) NULL);
 710   assert(images->signature == MagickSignature);
 711   return(images->previous);
 712 }
 713 \f
 714 /*
 715 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 716 %                                                                             %
 717 %                                                                             %
 718 %     I m a g e L i s t T o A r r a y                                         %
 719 %                                                                             %
 720 %                                                                             %
 721 %                                                                             %
 722 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 723 %
 724 %  ImageListToArray() is a convenience method that converts an image list to
 725 %  a sequential array.  For example,
 726 %
 727 %    group = ImageListToArray(images, exception);
 728 %    while (i = 0; group[i] != (Image *) NULL; i++)
 729 %      printf("%s\n", group[i]->filename);
 730 %    printf("%d images\n", i);
 731 %    group = RelinquishMagickMemory(group);
 732 %
 733 %  The format of the ImageListToArray method is:
 734 %
 735 %      Image **ImageListToArray(const Image *images,ExceptionInfo *exception)
 736 %
 737 %  A description of each parameter follows:
 738 %
 739 %    o image: the image list.
 740 %
 741 %    o exception: return any errors or warnings in this structure.
 742 %
 743 */
 744 MagickExport Image **ImageListToArray(const Image *images,
 745   ExceptionInfo *exception)
 746 {
 747   Image
 748     **group;
 749
 750   register ssize_t
 751     i;
 752
 753   if (images == (Image *) NULL)
 754     return((Image **) NULL);
 755   assert(images->signature == MagickSignature);
 756   if (images->debug != MagickFalse)
 757     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",images->filename);
 758   group=(Image **) AcquireQuantumMemory((size_t) GetImageListLength(images)+1UL,
 759     sizeof(*group));
 760   if (group == (Image **) NULL)
 761     {
 762       (void) ThrowMagickException(exception,GetMagickModule(),
 763         ResourceLimitError,"MemoryAllocationFailed","`%s'",images->filename);
 764       return((Image **) NULL);
 765     }
 766   images=GetFirstImageInList(images);
 767   for (i=0; images != (Image *) NULL; images=images->next)
 768     group[i++]=(Image *) images;
 769   group[i]=(Image *) NULL;
 770   return(group);
 771 }
 772 \f
 773 /*
 774 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 775 %                                                                             %
 776 %                                                                             %
 777 %                                                                             %
 778 %   I n s e r t I m a g e I n L i s t                                         %
 779 %                                                                             %
 780 %                                                                             %
 781 %                                                                             %
 782 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 783 %
 784 %  InsertImageInList() inserts the second image or image list into the first
 785 %  image list immediately after the image pointed to.  The given image list
 786 %  pointer is unchanged unless previously empty.
 787 %
 788 %  The format of the InsertImageInList method is:
 789 %
 790 %      InsertImageInList(Image **images,Image *image)
 791 %
 792 %  A description of each parameter follows:
 793 %
 794 %    o images: the image list to insert into.
 795 %
 796 %    o image: the image list to insert.
 797 %
 798 */
 799 MagickExport void InsertImageInList(Image **images,Image *image)
 800 {
 801   Image
 802     *split;
 803
 804   assert(images != (Image **) NULL);
 805   assert(image != (Image *) NULL);
 806   assert(image->signature == MagickSignature);
 807   if (image->debug != MagickFalse)
 808     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 809   if ((*images) == (Image *) NULL)
 810     return;
 811   assert((*images)->signature == MagickSignature);
 812   split=SplitImageList(*images);
 813   AppendImageToList(images,image);
 814   AppendImageToList(images,split);
 815 }
 816 \f
 817 /*
 818 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 819 %                                                                             %
 820 %                                                                             %
 821 %                                                                             %
 822 %   N e w I m a g e L i s t                                                   %
 823 %                                                                             %
 824 %                                                                             %
 825 %                                                                             %
 826 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 827 %
 828 %  NewImageList() creates an empty image list.
 829 %
 830 %  The format of the NewImageList method is:
 831 %
 832 %      Image *NewImageList(void)
 833 %
 834 */
 835 MagickExport Image *NewImageList(void)
 836 {
 837   return((Image *) NULL);
 838 }
 839 \f
 840 /*
 841 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 842 %                                                                             %
 843 %                                                                             %
 844 %                                                                             %
 845 %   P r e p e n d I m a g e T o L i s t                                       %
 846 %                                                                             %
 847 %                                                                             %
 848 %                                                                             %
 849 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 850 %
 851 %  PrependImageToList() prepends the image to the beginning of the list.
 852 %
 853 %  The format of the PrependImageToList method is:
 854 %
 855 %      PrependImageToList(Image *images,Image *image)
 856 %
 857 %  A description of each parameter follows:
 858 %
 859 %    o images: the image list.
 860 %
 861 %    o image: the image.
 862 %
 863 */
 864 MagickExport void PrependImageToList(Image **images,Image *image)
 865 {
 866   AppendImageToList(&image,*images);
 867 }
 868 \f
 869 /*
 870 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 871 %                                                                             %
 872 %                                                                             %
 873 %                                                                             %
 874 %   R e m o v e I m a g e F r o m L i s t                                     %
 875 %                                                                             %
 876 %                                                                             %
 877 %                                                                             %
 878 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 879 %
 880 %  RemoveImageFromList() removes and returns the image pointed to.
 881 %
 882 %  The given image list pointer is set to point to the next image in list
 883 %  if it exists, otherwise it is set to the previous image, or NULL if list
 884 %  was emptied.
 885 %
 886 %  The format of the RemoveImageFromList method is:
 887 %
 888 %      Image *RemoveImageFromList(Image **images)
 889 %
 890 %  A description of each parameter follows:
 891 %
 892 %    o images: the image list.
 893 %
 894 */
 895 MagickExport Image *RemoveImageFromList(Image **images)
 896 {
 897   register Image
 898     *p;
 899
 900   assert(images != (Image **) NULL);
 901   if ((*images) == (Image *) NULL)
 902     return((Image *) NULL);
 903   assert((*images)->signature == MagickSignature);
 904   if ((*images)->debug != MagickFalse)
 905     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 906       (*images)->filename);
 907   p=(*images);
 908   if ((p->previous == (Image *) NULL) && (p->next == (Image *) NULL))
 909     *images=(Image *) NULL;
 910   else
 911     {
 912       if (p->previous != (Image *) NULL)
 913         {
 914           p->previous->next=p->next;
 915           *images=p->previous;
 916         }
 917       if (p->next != (Image *) NULL)
 918         {
 919           p->next->previous=p->previous;
 920           *images=p->next;
 921         }
 922       p->previous=(Image *) NULL;
 923       p->next=(Image *) NULL;
 924     }
 925   return(p);
 926 }
 927 \f
 928 /*
 929 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 930 %                                                                             %
 931 %                                                                             %
 932 %                                                                             %
 933 %   R e m o v e F i r s t I m a g e F r o m L i s t                           %
 934 %                                                                             %
 935 %                                                                             %
 936 %                                                                             %
 937 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 938 %
 939 %  RemoveFirstImageFromList() removes and returns the first image in the list.
 940 %
 941 %  If the given image list pointer pointed to the removed first image, it is
 942 %  set to the new first image of list, or NULL if list was emptied, otherwise
 943 %  it is left as is.
 944 %
 945 %  The format of the RemoveFirstImageFromList method is:
 946 %
 947 %      Image *RemoveFirstImageFromList(Image **images)
 948 %
 949 %  A description of each parameter follows:
 950 %
 951 %    o images: the image list.
 952 %
 953 */
 954 MagickExport Image *RemoveFirstImageFromList(Image **images)
 955 {
 956   Image
 957     *image;
 958
 959   assert(images != (Image **) NULL);
 960   if ((*images) == (Image *) NULL)
 961     return((Image *) NULL);
 962   assert((*images)->signature == MagickSignature);
 963   if ((*images)->debug != MagickFalse)
 964     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 965       (*images)->filename);
 966   image=(*images);
 967   while (image->previous != (Image *) NULL)
 968     image=image->previous;
 969   if (image == *images)
 970     *images=(*images)->next;
 971   if (image->next != (Image *) NULL)
 972     {
 973       image->next->previous=(Image *) NULL;
 974       image->next=(Image *) NULL;
 975     }
 976   return(image);
 977 }
 978 \f
 979 /*
 980 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 981 %                                                                             %
 982 %                                                                             %
 983 %                                                                             %
 984 %   R e m o v e L a s t I m a g e F r o m L i s t                             %
 985 %                                                                             %
 986 %                                                                             %
 987 %                                                                             %
 988 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 989 %
 990 %  RemoveLastImageFromList() removes and returns the last image from the list.
 991 %
 992 %  If the given image list pointer pointed to the removed last image, it is
 993 %  set to the new last image of list, or NULL if list was emptied, otherwise
 994 %  it is left as is.
 995 %
 996 %  The format of the RemoveLastImageFromList method is:
 997 %
 998 %      Image *RemoveLastImageFromList(Image **images)
 999 %
1000 %  A description of each parameter follows:
1001 %
1002 %    o images: the image list.
1003 %
1004 */
1005 MagickExport Image *RemoveLastImageFromList(Image **images)
1006 {
1007   Image
1008     *image;
1009
1010   assert(images != (Image **) NULL);
1011   if ((*images) == (Image *) NULL)
1012     return((Image *) NULL);
1013   assert((*images)->signature == MagickSignature);
1014   if ((*images)->debug != MagickFalse)
1015     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
1016       (*images)->filename);
1017   image=(*images);
1018   while (image->next != (Image *) NULL)
1019     image=image->next;
1020   if (image == *images)
1021     *images=(*images)->previous;
1022   if (image->previous != (Image *) NULL)
1023     {
1024       image->previous->next=(Image *) NULL;
1025       image->previous=(Image *) NULL;
1026     }
1027   return(image);
1028 }
1029 \f
1030 /*
1031 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1032 %                                                                             %
1033 %                                                                             %
1034 %                                                                             %
1035 %   R e p l a c e I m a g e I n L i s t                                       %
1036 %                                                                             %
1037 %                                                                             %
1038 %                                                                             %
1039 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1040 %
1041 %  ReplaceImageInList() replaces an image in the list. Old image is destroyed.
1042 %  The given image list pointer is set to point to the just inserted image.
1043 %
1044 %  The format of the ReplaceImageInList method is:
1045 %
1046 %      ReplaceImageInList(Image **images,Image *image)
1047 %
1048 %  A description of each parameter follows:
1049 %
1050 %    o images: the image list.
1051 %
1052 %    o image: the image.
1053 %
1054 */
1055 MagickExport void ReplaceImageInList(Image **images,Image *image)
1056 {
1057   assert(images != (Image **) NULL);
1058   assert(image != (Image *) NULL);
1059   assert(image->signature == MagickSignature);
1060   if (image->debug != MagickFalse)
1061     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1062   if ((*images) == (Image *) NULL)
1063     return;
1064   assert((*images)->signature == MagickSignature);
1065   for ( ; image->next != (Image *) NULL; image=image->next) ;
1066   image->next=(*images)->next;
1067   if (image->next != (Image *) NULL)
1068     image->next->previous=image;
1069   for ( ; image->previous != (Image *) NULL; image=image->previous) ;
1070   image->previous=(*images)->previous;
1071   if (image->previous != (Image *) NULL)
1072     image->previous->next=image;
1073   (void) DestroyImage(*images);
1074   (*images)=image;
1075 }
1076 \f
1077 /*
1078 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1079 %                                                                             %
1080 %                                                                             %
1081 %                                                                             %
1082 %   R e v e r s e I m a g e L i s t                                           %
1083 %                                                                             %
1084 %                                                                             %
1085 %                                                                             %
1086 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1087 %
1088 %  ReverseImageList() reverses the order of an image list.
1089 %  The list pointer is reset to that start of the re-ordered list.
1090 %
1091 %  The format of the ReverseImageList method is:
1092 %
1093 %      void ReverseImageList(Image **images)
1094 %
1095 %  A description of each parameter follows:
1096 %
1097 %    o images: the image list.
1098 %
1099 */
1100 MagickExport void ReverseImageList(Image **images)
1101 {
1102   Image
1103     *next;
1104
1105   register Image
1106     *p;
1107
1108   assert(images != (Image **) NULL);
1109   if ((*images) == (Image *) NULL)
1110     return;
1111   assert((*images)->signature == MagickSignature);
1112   if ((*images)->debug != MagickFalse)
1113     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
1114       (*images)->filename);
1115   for (p=(*images); p->next != (Image *) NULL; p=p->next) ;
1116   *images=p;
1117   for ( ; p != (Image *) NULL; p=p->next)
1118   {
1119     next=p->next;
1120     p->next=p->previous;
1121     p->previous=next;
1122   }
1123 }
1124 \f
1125 /*
1126 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1127 %                                                                             %
1128 %                                                                             %
1129 %                                                                             %
1130 %   S p l i c e I m a g e I n t o L i s t                                     %
1131 %                                                                             %
1132 %                                                                             %
1133 %                                                                             %
1134 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1135 %
1136 %  SpliceImageIntoList() removes 'length' images from the list and replaces
1137 %  them with the specified splice. Removed images are returned.
1138 %
1139 %  The format of the SpliceImageIntoList method is:
1140 %
1141 %      SpliceImageIntoList(Image **images,const size_t,
1142 %        const Image *splice)
1143 %
1144 %  A description of each parameter follows:
1145 %
1146 %    o images: the image list.
1147 %
1148 %    o length: the length of the image list to remove.
1149 %
1150 %    o splice: Replace the removed image list with this list.
1151 %
1152 */
1153 MagickExport Image *SpliceImageIntoList(Image **images,
1154   const size_t length,const Image *splice)
1155 {
1156   Image
1157     *image,
1158     *split;
1159
1160   register size_t
1161     i;
1162
1163   assert(images != (Image **) NULL);
1164   assert(splice != (Image *) NULL);
1165   assert(splice->signature == MagickSignature);
1166   if ((*images) == (Image *) NULL)
1167     return((Image *) NULL);
1168   assert((*images)->signature == MagickSignature);
1169   if ((*images)->debug != MagickFalse)
1170     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
1171       (*images)->filename);
1172   split=SplitImageList(*images);
1173   AppendImageToList(images,splice);
1174   image=(Image *) NULL;
1175   for (i=0; (i < length) && (split != (Image *) NULL); i++)
1176     AppendImageToList(&image,RemoveImageFromList(&split));
1177   AppendImageToList(images,split);
1178   return(image);
1179 }
1180 \f
1181 /*
1182 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1183 %                                                                             %
1184 %                                                                             %
1185 %                                                                             %
1186 %   S p l i t I m a g e L i s t                                               %
1187 %                                                                             %
1188 %                                                                             %
1189 %                                                                             %
1190 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1191 %
1192 %  SplitImageList() splits an image into two lists, after given image
1193 %  The list that was split off is returned, which may be empty.
1194 %
1195 %  The format of the SplitImageList method is:
1196 %
1197 %      Image *SplitImageList(Image *images)
1198 %
1199 %  A description of each parameter follows:
1200 %
1201 %    o images: the image list.
1202 %
1203 */
1204 MagickExport Image *SplitImageList(Image *images)
1205 {
1206   if ((images == (Image *) NULL) || (images->next == (Image *) NULL))
1207     return((Image *) NULL);
1208   images=images->next;
1209   images->previous->next=(Image *) NULL;
1210   images->previous=(Image *) NULL;
1211   return(images);
1212 }
1213 \f
1214 /*
1215 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1216 %                                                                             %
1217 %                                                                             %
1218 %                                                                             %
1219 +   S y n c I m a g e L i s t                                                 %
1220 %                                                                             %
1221 %                                                                             %
1222 %                                                                             %
1223 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1224 %
1225 %  SyncImageList() synchronizes the scene numbers in an image list.
1226 %
1227 %  The format of the SyncImageList method is:
1228 %
1229 %      void SyncImageList(Image *images)
1230 %
1231 %  A description of each parameter follows:
1232 %
1233 %    o images: the image list.
1234 %
1235 */
1236 MagickExport void SyncImageList(Image *images)
1237 {
1238   register Image
1239     *p,
1240     *q;
1241
1242   if (images == (Image *) NULL)
1243     return;
1244   assert(images->signature == MagickSignature);
1245   for (p=images; p != (Image *) NULL; p=p->next)
1246   {
1247     for (q=p->next; q != (Image *) NULL; q=q->next)
1248       if (p->scene == q->scene)
1249         break;
1250     if (q != (Image *) NULL)
1251       break;
1252   }
1253   if (p == (Image *) NULL)
1254     return;
1255   for (p=images->next; p != (Image *) NULL; p=p->next)
1256     p->scene=p->previous->scene+1;
1257 }
1258 \f
1259 /*
1260 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1261 %                                                                             %
1262 %                                                                             %
1263 %                                                                             %
1264 +   S y n c N e x t I m a g e I n L i s t                                     %
1265 %                                                                             %
1266 %                                                                             %
1267 %                                                                             %
1268 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1269 %
1270 %  SyncNextImageInList() returns the next image in the list after the blob
1271 %  referenced is synchronized with the current image.
1272 %
1273 %  The format of the SyncNextImageInList method is:
1274 %
1275 %      Image *SyncNextImageInList(const Image *images)
1276 %
1277 %  A description of each parameter follows:
1278 %
1279 %    o images: the image list.
1280 %
1281 */
1282 MagickExport Image *SyncNextImageInList(const Image *images)
1283 {
1284   if (images == (Image *) NULL)
1285     return((Image *) NULL);
1286   assert(images->signature == MagickSignature);
1287   if (images->next == (Image *) NULL)
1288     return((Image *) NULL);
1289   if (images->blob != images->next->blob)
1290     {
1291       DestroyBlob(images->next);
1292       images->next->blob=ReferenceBlob(images->blob);
1293     }
1294   images->next->compression=images->compression;
1295   images->next->endian=images->endian;
1296   return(images->next);
1297 }