granicus.if.org Git - imagemagick/blob - coders/djvu.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                         DDDD       J  V   V  U   U                          %
   7 %                         D   D      J  V   V  U   U                          %
   8 %                         D   D      J  V   V  U   U                          %
   9 %                         D   D  J   J   V V   U   U                          %
  10 %                         DDDD    JJJ     V     UUU                           %
  11 %                                                                             %
  12 %                                                                             %
  13 %                             Read DjVu Images.                               %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2019 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 %    https://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 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/blob.h"
  44 #include "MagickCore/blob-private.h"
  45 #include "MagickCore/cache.h"
  46 #include "MagickCore/colormap.h"
  47 #include "MagickCore/constitute.h"
  48 #include "MagickCore/exception.h"
  49 #include "MagickCore/exception-private.h"
  50 #include "MagickCore/image-private.h"
  51 #include "MagickCore/list.h"
  52 #include "MagickCore/magick.h"
  53 #include "MagickCore/memory_.h"
  54 #include "MagickCore/monitor.h"
  55 #include "MagickCore/monitor-private.h"
  56 #include "MagickCore/pixel-accessor.h"
  57 #include "MagickCore/quantum-private.h"
  58 #include "MagickCore/static.h"
  59 #include "MagickCore/string_.h"
  60 #include "MagickCore/module.h"
  61 #if defined(MAGICKCORE_DJVU_DELEGATE)
  62 #include <libdjvu/ddjvuapi.h>
  63 #endif
  64 \f
  65 /*
  66 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  67 %                                                                             %
  68 %                                                                             %
  69 %                                                                             %
  70 %   I s D J V U                                                               %
  71 %                                                                             %
  72 %                                                                             %
  73 %                                                                             %
  74 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  75 %
  76 %  IsDJVU() returns MagickTrue if the image format type, identified by the
  77 %  magick string, is DJVU.
  78 %
  79 %  The format of the IsDJVU method is:
  80 %
  81 %      MagickBooleanType IsDJVU(const unsigned char *magick,const size_t length)
  82 %
  83 %  A description of each parameter follows:
  84 %
  85 %    o magick: compare image format pattern against these bytes.
  86 %
  87 %    o length: Specifies the length of the magick string.
  88 %
  89 */
  90 static MagickBooleanType IsDJVU(const unsigned char *magick,const size_t length)
  91 {
  92   if (length < 8)
  93     return(MagickFalse);
  94   if (memcmp(magick,"AT&TFORM",8) == 0)
  95     return(MagickTrue);
  96   return(MagickFalse);
  97 }
  98 \f
  99 #if defined(MAGICKCORE_DJVU_DELEGATE)
 100 /*
 101 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 102 %                                                                             %
 103 %                                                                             %
 104 %                                                                             %
 105 %   R e a d D J V U I m a g e                                                 %
 106 %                                                                             %
 107 %                                                                             %
 108 %                                                                             %
 109 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 110 %
 111 %  ReadDJVUImage() reads DJVU image and returns it.  It allocates the memory
 112 %  necessary for the new Image structure and returns a pointer to the new
 113 %  image or set of images.
 114 %
 115 %  The format of the ReadDJVUImage method is:
 116 %
 117 %      Image *ReadDJVUImage(const ImageInfo *image_info,
 118 %        ExceptionInfo *exception)
 119 %
 120 %  A description of each parameter follows:
 121 %
 122 %    o image_info: the image info.
 123 %
 124 %    o exception: return any errors or warnings in this structure.
 125 %
 126 */
 127
 128 #if defined(__cplusplus) || defined(c_plusplus)
 129 extern "C" {
 130 #endif
 131
 132 typedef struct _LoadContext
 133    LoadContext;
 134
 135 struct _LoadContext
 136 {
 137   ddjvu_context_t* context;
 138   ddjvu_document_t *document;
 139   ddjvu_page_t *page;
 140   int streamid;
 141   int pages;
 142   Image *image;
 143 };
 144
 145 #define BLOCKSIZE  65536
 146 #if 0
 147 static void
 148 pump_data(Image *image, LoadContext* lc)
 149 {
 150         int blocksize = BLOCKSIZE;
 151         char data[BLOCKSIZE];
 152         int size;
 153
 154         /* i might check for a condition! */
 155         while ((size = (size_t) ReadBlob(image,(size_t) blocksize,data)) == blocksize) {
 156                 ddjvu_stream_write(lc->document, lc->streamid, data, size);
 157         }
 158         if (size)
 159                 ddjvu_stream_write(lc->document, lc->streamid, data, size);
 160         ddjvu_stream_close(lc->document, lc->streamid, 0);
 161 }
 162 #endif
 163
 164 /* returns NULL only after all is delivered! */
 165 static ddjvu_message_t*
 166 pump_data_until_message(LoadContext *lc,Image *image) /* ddjvu_context_t *context, type ddjvu_document_type_t */
 167 {
 168         size_t blocksize = BLOCKSIZE;
 169         unsigned char data[BLOCKSIZE];
 170         size_t size;
 171         ddjvu_message_t *message;
 172
 173         /* i might check for a condition! */
 174         size=0;
 175         while (!(message = ddjvu_message_peek(lc->context))
 176                && (size = (size_t) ReadBlob(image,(size_t) blocksize,data)) == blocksize) {
 177                 ddjvu_stream_write(lc->document, lc->streamid, (char *) data, size);
 178         }
 179         if (message)
 180                 return message;
 181         if (size)
 182                 ddjvu_stream_write(lc->document, lc->streamid, (char *) data, size);
 183         ddjvu_stream_close(lc->document, lc->streamid, 0);
 184         return NULL;
 185 }
 186 #define DEBUG 0
 187
 188 #if DEBUG
 189 static const char *message_tag_name(ddjvu_message_tag_t tag)
 190 {
 191    static char* names[] =
 192       {
 193          "ERROR",
 194          "INFO",
 195          "NEWSTREAM",
 196          "DOCINFO",
 197          "PAGEINFO",
 198          "RELAYOUT",
 199          "REDISPLAY",
 200          "CHUNK",
 201          "THUMBNAIL",
 202          "PROGRESS",
 203       };
 204    if (tag <= DDJVU_PROGRESS)
 205       return names[tag];
 206    else {
 207       /* bark! */
 208       return 0;
 209    }
 210 }
 211 #endif
 212
 213 /* write out nice info on the message,
 214  * and store in *user* data the info on progress.
 215  * */
 216 int
 217 process_message(ddjvu_message_t *message)
 218 {
 219
 220 #if 0
 221    ddjvu_context_t* context= message->m_any.context;
 222 #endif
 223
 224    if (! message)
 225       return(-1);
 226 #if DEBUG
 227    printf("*** %s: %s.\n",__FUNCTION__, message_tag_name(message->m_any.tag));
 228 #endif
 229
 230
 231    switch (message->m_any.tag){
 232    case DDJVU_DOCINFO:
 233    {
 234       ddjvu_document_t* document= message->m_any.document;
 235       /* ddjvu_document_decoding_status  is set by libdjvu! */
 236       /* we have some info on the document  */
 237       LoadContext *lc = (LoadContext *) ddjvu_document_get_user_data(document);
 238       lc->pages = ddjvu_document_get_pagenum(document);
 239 #if DEBUG
 240       printf("the doc has %d pages\n", ddjvu_document_get_pagenum(document));
 241 #endif
 242       break;
 243    }
 244    case DDJVU_CHUNK:
 245 #if DEBUG
 246            printf("the name of the chunk is: %s\n", message->m_chunk.chunkid);
 247 #endif
 248            break;
 249
 250
 251    case DDJVU_RELAYOUT:
 252    case DDJVU_PAGEINFO:
 253    {
 254 #if 0
 255       ddjvu_page_t* page = message->m_any.page;
 256       page_info* info = ddjvu_page_get_user_data(page);
 257
 258       printf("page decoding status: %d %s%s%s\n",
 259              ddjvu_page_decoding_status(page),
 260              status_color, status_name(ddjvu_page_decoding_status(page)), color_reset);
 261
 262       printf("the page LAYOUT changed: width x height: %d x %d @ %d dpi. Version %d, type %d\n",
 263              // printf("page info:\n width x height: %d x %d @ %d dpi, version %d, type %d\n",
 264              ddjvu_page_get_width(page),
 265              ddjvu_page_get_height(page),
 266              ddjvu_page_get_resolution(page),
 267              ddjvu_page_get_version(page),
 268              /* DDJVU_PAGETYPE_BITONAL */
 269              ddjvu_page_get_type(page));
 270
 271       info->info = 1;
 272 #endif
 273       break;
 274    }
 275
 276    case DDJVU_REDISPLAY:
 277    {
 278
 279 #if 0
 280     ddjvu_page_t* page = message->m_any.page;
 281       page_info* info = ddjvu_page_get_user_data(page);
 282
 283       printf("the page can/should be REDISPLAYED\n");
 284       info->display = 1;
 285 #endif
 286       break;
 287    }
 288
 289    case DDJVU_PROGRESS:
 290 #if DEBUG
 291            printf("PROGRESS:\n");
 292 #endif
 293            break;
 294    case DDJVU_ERROR:
 295            printf("simply ERROR!\n message:\t%s\nfunction:\t%s(file %s)\nlineno:\t%d\n",
 296                   message->m_error.message,
 297                   message->m_error.function,
 298                   message->m_error.filename,
 299                   message->m_error.lineno);
 300            break;
 301    case DDJVU_INFO:
 302 #if DEBUG
 303            printf("INFO: %s!\n", message->m_info.message);
 304 #endif
 305            break;
 306    default:
 307       printf("unexpected\n");
 308    };
 309   return(message->m_any.tag);
 310 }
 311
 312
 313 #if defined(__cplusplus) || defined(c_plusplus)
 314 }
 315 #endif
 316
 317
 318 #define RGB 1
 319
 320 /*
 321  * DjVu advertised readiness to provide bitmap: So get it!
 322  * we use the RGB format!
 323  */
 324 static void
 325 get_page_image(LoadContext *lc, ddjvu_page_t *page, int x, int y, int w, int h, ExceptionInfo *exception ) {
 326   ddjvu_format_t
 327     *format;
 328
 329   ddjvu_page_type_t
 330     type;
 331
 332   Image
 333     *image;
 334
 335   int
 336     ret,
 337     stride;
 338
 339   unsigned char
 340     *q;
 341
 342         ddjvu_rect_t rect;
 343         rect.x = x;
 344         rect.y = y;
 345         rect.w = (unsigned int) w;             /* /10 */
 346         rect.h = (unsigned int) h;             /* /10 */
 347
 348         image = lc->image;
 349         type = ddjvu_page_get_type(lc->page);
 350
 351         /* stride of this temporary buffer: */
 352         stride = (type == DDJVU_PAGETYPE_BITONAL)?
 353                 (image->columns + 7)/8 : image->columns *3;
 354
 355         q = (unsigned char *) AcquireQuantumMemory(image->rows,stride);
 356         if (q == (unsigned char *) NULL)
 357           return;
 358
 359         format = ddjvu_format_create(
 360                 (type == DDJVU_PAGETYPE_BITONAL)?DDJVU_FORMAT_LSBTOMSB : DDJVU_FORMAT_RGB24,
 361                 /* DDJVU_FORMAT_RGB24
 362                  * DDJVU_FORMAT_RGBMASK32*/
 363                 /* DDJVU_FORMAT_RGBMASK32 */
 364                 0, NULL);
 365
 366 #if 0
 367         /* fixme:  ThrowReaderException is a macro, which uses  `exception' variable */
 368         if (format == NULL)
 369                 {
 370                         abort();
 371                         /* ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed"); */
 372                 }
 373
 374 #endif
 375         ddjvu_format_set_row_order(format, 1);
 376         ddjvu_format_set_y_direction(format, 1);
 377
 378         ret = ddjvu_page_render(page,
 379                                     DDJVU_RENDER_COLOR, /* ddjvu_render_mode_t */
 380                                     &rect,
 381                                     &rect,     /* mmc: ?? */
 382                                     format,
 383                                     stride, /* ?? */
 384                                     (char*)q);
 385         (void) ret;
 386         ddjvu_format_release(format);
 387
 388
 389         if (type == DDJVU_PAGETYPE_BITONAL) {
 390                 /*  */
 391 #if DEBUG
 392                 printf("%s: expanding BITONAL page/image\n", __FUNCTION__);
 393 #endif
 394                 size_t bit, byte;
 395
 396                 for (y=0; y < (ssize_t) image->rows; y++)
 397                         {
 398                                 Quantum * o = QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 399                                 if (o == (Quantum *) NULL)
 400                                         break;
 401                                 bit=0;
 402                                 byte=0;
 403
 404                                 /* fixme:  the non-aligned, last =<7 bits ! that's ok!!!*/
 405                                 for (x= 0; x < (ssize_t) image->columns; x++)
 406                                         {
 407                                                 if (bit == 0) byte= (size_t) q[(y * stride) + (x / 8)];
 408
 409                                                 SetPixelIndex(image,(Quantum) (((byte & 0x01) != 0) ? 0x00 : 0x01),o);
 410                                                 bit++;
 411                                                 if (bit == 8)
 412                                                         bit=0;
 413                                                 byte>>=1;
 414                                           o+=GetPixelChannels(image);
 415                                         }
 416                                 if (SyncAuthenticPixels(image,exception) == MagickFalse)
 417                                         break;
 418                         }
 419                 if (!image->ping)
 420                   SyncImage(image,exception);
 421         } else {
 422 #if DEBUG
 423                 printf("%s: expanding PHOTO page/image\n", __FUNCTION__);
 424 #endif
 425                 /* now transfer line-wise: */
 426                 ssize_t i;
 427 #if 0
 428                 /* old: */
 429                 char* r;
 430 #else
 431                 register Quantum *r;
 432                 unsigned char *s;
 433 #endif
 434                 s=q;
 435                 for (i = 0;i< (ssize_t) image->rows; i++)
 436                         {
 437 #if DEBUG
 438                                if (i % 1000 == 0) printf("%d\n",i);
 439 #endif
 440                                r = QueueAuthenticPixels(image,0,i,image->columns,1,exception);
 441                                if (r == (Quantum *) NULL)
 442                                  break;
 443                   for (x=0; x < (ssize_t) image->columns; x++)
 444                   {
 445                     SetPixelRed(image,ScaleCharToQuantum(*s++),r);
 446                     SetPixelGreen(image,ScaleCharToQuantum(*s++),r);
 447                     SetPixelBlue(image,ScaleCharToQuantum(*s++),r);
 448                     r+=GetPixelChannels(image);
 449                   }
 450
 451                               (void) SyncAuthenticPixels(image,exception);
 452                         }
 453         }
 454         q=(unsigned char *) RelinquishMagickMemory(q);
 455 }
 456
 457
 458 #if defined(MAGICKCORE_DJVU_DELEGATE)
 459
 460 #if 0
 461 static int
 462 get_page_line(LoadContext *lc, int row, QuantumInfo* quantum_info)
 463 {
 464   ddjvu_format_t
 465     *format;
 466
 467   int
 468     ret;
 469
 470   size_t
 471     stride;
 472
 473   unsigned char
 474     *q;
 475
 476         ddjvu_rect_t rect, pagerect;
 477         rect.x = 0;
 478         rect.y = row;
 479         rect.w = lc->image->columns;             /* /10 */
 480         rect.h = 1;             /* /10 */
 481
 482         pagerect.x = 0;
 483         pagerect.y = 0;
 484         pagerect.w = lc->image->columns;
 485         pagerect.h = lc->image->rows;
 486
 487
 488         format = ddjvu_format_create(
 489 #if RGB
 490                 DDJVU_FORMAT_RGB24
 491 #else
 492                 DDJVU_FORMAT_GREY8
 493 #endif
 494                 ,
 495                 0, NULL);
 496         ddjvu_format_set_row_order(format, 1);
 497         ddjvu_format_set_y_direction(format, 1);
 498
 499         stride=1;
 500 #if RGB
 501         stride=3;
 502 #endif
 503         q = (unsigned char *) AcquireQuantumMemory(lc->image->columns,stride);
 504
 505         ret = ddjvu_page_render(lc->page,
 506                                     DDJVU_RENDER_COLOR, /* ddjvu_render_mode_t */
 507                                     &pagerect,
 508                                     &rect,     /* mmc: ?? */
 509                                     format,
 510                                     pagerect.w * 3, /* ?? */
 511                                     (char*)q);
 512
 513         ImportQuantumPixels(lc->image,
 514                             (CacheView *) NULL,
 515                             quantum_info,
 516 #if RGB
 517                             RGBQuantum
 518 #else
 519                             GrayQuantum
 520 #endif
 521                             ,q,&lc->image->exception);
 522         q=(unsigned char *) RelinquishMagickMemory(q);
 523         ddjvu_format_release(format);
 524         return ret;
 525 }
 526 #endif
 527 #endif
 528
 529 /*
 530 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 531 %                                                                             %
 532 %                                                                             %
 533 %                                                                             %
 534 %   R e a d O n e D J V U I m a g e                                           %
 535 %                                                                             %
 536 %                                                                             %
 537 %                                                                             %
 538 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 539 %
 540 %  ReadOneDJVUImage() reads a Portable Network Graphics (DJVU) image file
 541 %  (minus the 8-byte signature)  and returns it.  It allocates the memory
 542 %  necessary for the new Image structure and returns a pointer to the new
 543 %  image.
 544 %
 545 %  The format of the ReadOneDJVUImage method is:
 546 %
 547 %      Image *ReadOneDJVUImage(MngInfo *mng_info, const ImageInfo *image_info,
 548 %         ExceptionInfo *exception)
 549 %
 550 %  A description of each parameter follows:
 551 %
 552 %    o mng_info: Specifies a pointer to a MngInfo structure.
 553 %
 554 %    o image_info: the image info.
 555 %
 556 %    o exception: return any errors or warnings in this structure.
 557 %
 558 */
 559
 560 static Image *ReadOneDJVUImage(LoadContext* lc,const int pagenum,
 561   const ImageInfo *image_info,ExceptionInfo *exception)
 562 {
 563   ddjvu_page_type_t
 564      type;
 565
 566   ddjvu_pageinfo_t info;
 567   ddjvu_message_t *message;
 568   Image *image;
 569   int logging;
 570   int tag;
 571   MagickBooleanType status;
 572
 573         /* so, we know that the page is there! Get its dimension, and  */
 574
 575         /* Read one DJVU image */
 576         image = lc->image;
 577
 578         /* register Quantum *q; */
 579
 580         logging=LogMagickEvent(CoderEvent,GetMagickModule(), "  enter ReadOneDJVUImage()");
 581         (void) logging;
 582
 583 #if DEBUG
 584         printf("====  Loading the page %d\n", pagenum);
 585 #endif
 586         lc->page = ddjvu_page_create_by_pageno(lc->document, pagenum); /*  0? */
 587
 588         /* pump data untill the page is ready for rendering. */
 589         tag=(-1);
 590         do {
 591                 while ((message = ddjvu_message_peek(lc->context)))
 592                         {
 593                                 tag=process_message(message);
 594                                 if (tag == 0) break;
 595                                 ddjvu_message_pop(lc->context);
 596                         }
 597                 /* fixme: maybe exit? */
 598                 /* if (lc->error) break; */
 599
 600                 message = pump_data_until_message(lc,image);
 601                 if (message)
 602                         do {
 603                                 tag=process_message(message);
 604                                 if (tag == 0) break;
 605                                 ddjvu_message_pop(lc->context);
 606                         } while ((message = ddjvu_message_peek(lc->context)));
 607                if (tag == 0) break;
 608         } while (!ddjvu_page_decoding_done(lc->page));
 609
 610         ddjvu_document_get_pageinfo(lc->document, pagenum, &info);
 611
 612         image->resolution.x = (float) info.dpi;
 613         image->resolution.y =(float) info.dpi;
 614         if (image_info->density != (char *) NULL)
 615           {
 616             int
 617               flags;
 618
 619             GeometryInfo
 620               geometry_info;
 621
 622             /*
 623               Set rendering resolution.
 624             */
 625             flags=ParseGeometry(image_info->density,&geometry_info);
 626             image->resolution.x=geometry_info.rho;
 627             image->resolution.y=geometry_info.sigma;
 628             if ((flags & SigmaValue) == 0)
 629               image->resolution.y=image->resolution.x;
 630             info.width*=image->resolution.x/info.dpi;
 631             info.height*=image->resolution.y/info.dpi;
 632             info.dpi=(ssize_t) MagickMax(image->resolution.x,image->resolution.y);
 633           }
 634         type = ddjvu_page_get_type(lc->page);
 635
 636         /* double -> float! */
 637         /* image->gamma = (float)ddjvu_page_get_gamma(lc->page); */
 638
 639         /* mmc:  set  image->depth  */
 640         /* mmc:  This from the type */
 641
 642         image->columns=(size_t) info.width;
 643         image->rows=(size_t) info.height;
 644
 645         /* mmc: bitonal should be palettized, and compressed! */
 646         if (type == DDJVU_PAGETYPE_BITONAL){
 647                 image->colorspace = GRAYColorspace;
 648                 image->storage_class = PseudoClass;
 649                 image->depth =  8UL;    /* i only support that? */
 650                 image->colors= 2;
 651                 if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 652                   ThrowReaderException(ResourceLimitError,
 653                    "MemoryAllocationFailed");
 654         } else {
 655                 image->colorspace = RGBColorspace;
 656                 image->storage_class = DirectClass;
 657                 /* fixme:  MAGICKCORE_QUANTUM_DEPTH ?*/
 658                 image->depth =  8UL;    /* i only support that? */
 659
 660                 image->alpha_trait = BlendPixelTrait;
 661                 /* is this useful? */
 662         }
 663         status=SetImageExtent(image,image->columns,image->rows,exception);
 664         if (status == MagickFalse)
 665           return(DestroyImageList(image));
 666 #if DEBUG
 667         printf("now filling %.20g x %.20g\n",(double) image->columns,(double)
 668           image->rows);
 669 #endif
 670
 671
 672 #if 1                           /* per_line */
 673
 674         /* q = QueueAuthenticPixels(image,0,0,image->columns,image->rows); */
 675         get_page_image(lc, lc->page, 0, 0, info.width, info.height, exception);
 676 #else
 677         int i;
 678         for (i = 0;i< image->rows; i++)
 679                 {
 680                         printf("%d\n",i);
 681                         q = QueueAuthenticPixels(image,0,i,image->columns,1);
 682                         get_page_line(lc, i, quantum_info);
 683                         SyncAuthenticPixels(image);
 684                 }
 685
 686 #endif /* per_line */
 687
 688
 689 #if DEBUG
 690         printf("END: finished filling %.20g x %.20g\n",(double) image->columns,
 691           (double) image->rows);
 692 #endif
 693
 694         if (!image->ping)
 695           SyncImage(image,exception);
 696         /* mmc: ??? Convert PNM pixels to runlength-encoded MIFF packets. */
 697         /* image->colors =  */
 698
 699         /* how is the line padding  / stride? */
 700
 701         if (lc->page) {
 702                 ddjvu_page_release(lc->page);
 703                 lc->page = NULL;
 704         }
 705
 706         /* image->page.y=mng_info->y_off[mng_info->object_id]; */
 707         if (tag == 0)
 708           image=DestroyImage(image);
 709         return image;
 710         /* end of reading one DJVU page/image */
 711 }
 712
 713 #if 0
 714 /* palette */
 715   if (AcquireImageColormap(image,2,exception) == MagickFalse)
 716     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 717   /*
 718     Monochrome colormap.   mmc: this the default!
 719   */
 720   image->colormap[0].red=QuantumRange;
 721   image->colormap[0].green=QuantumRange;
 722   image->colormap[0].blue=QuantumRange;
 723   image->colormap[1].red=0;
 724   image->colormap[1].green=0;
 725   image->colormap[1].blue=0;
 726 #endif
 727
 728 static void djvu_close_lc(LoadContext* lc)
 729 {
 730         if (lc->document)
 731                 ddjvu_document_release(lc->document);
 732         if (lc->context)
 733                 ddjvu_context_release(lc->context);
 734         if (lc->page)
 735                 ddjvu_page_release(lc->page);
 736         RelinquishMagickMemory(lc);
 737 }
 738
 739 static Image *ReadDJVUImage(const ImageInfo *image_info,
 740   ExceptionInfo *exception)
 741 {
 742   const char
 743     *url;
 744
 745   ddjvu_message_t
 746     *message;
 747
 748   Image
 749     *image,
 750     *images;
 751
 752   int
 753     logging,
 754     use_cache;
 755
 756   LoadContext
 757     *lc;
 758
 759   MagickBooleanType
 760     status;
 761
 762   register ssize_t
 763     i;
 764
 765   /*
 766    * Open image file.
 767    */
 768   assert(image_info != (const ImageInfo *) NULL);
 769   assert(image_info->signature == MagickCoreSignature);
 770
 771
 772   if (image_info->debug != MagickFalse)
 773     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s", image_info->filename);
 774
 775   assert(exception != (ExceptionInfo *) NULL);
 776   assert(exception->signature == MagickCoreSignature);
 777
 778
 779   logging = LogMagickEvent(CoderEvent,GetMagickModule(),"enter ReadDJVUImage()");
 780   (void) logging;
 781
 782   image = AcquireImage(image_info,exception); /* mmc: ?? */
 783
 784
 785   lc = (LoadContext *) NULL;
 786   status = OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 787   if (status == MagickFalse)
 788     ThrowReaderException(FileOpenError,"UnableToOpenFile");
 789   /*
 790     Verify DJVU signature.
 791   */
 792 #if 0
 793   count = ReadBlob(image,8,(unsigned char *) magic_number);
 794
 795   /* IsDJVU(const unsigned char *magick,const size_t length) */
 796   if (memcmp(magic_number,"AT&TFORM",8) != 0)
 797     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 798 #endif
 799
 800
 801   /*
 802    * Allocate a LoadContext structure.
 803    */
 804   lc = (LoadContext *) AcquireMagickMemory(sizeof(*lc));
 805   if (lc == NULL)
 806     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 807
 808
 809   /*
 810    * Initialize members of the MngInfo structure.
 811    */
 812   (void) memset(lc,0,sizeof(LoadContext));
 813
 814   lc->image = image;
 815   lc->pages = 0;
 816   lc->context = ddjvu_context_create("ImageMagick djvu loader"); /* g_program_name */
 817
 818   ddjvu_cache_set_size(lc->context, 1); /* right? */
 819   use_cache = 0;
 820   /* document: here we don't have a filename, but, for the sake of generality, a FILE* ! */
 821   url="https://imagemagick.org/fake.djvu";
 822   lc->document = ddjvu_document_create(lc->context, url, use_cache); /* don't cache */
 823   ddjvu_document_set_user_data(lc->document, lc);
 824
 825
 826   /* now we wait the message-request for data: */
 827   message = ddjvu_message_wait(lc->context);
 828
 829   if (message->m_any.tag != DDJVU_NEWSTREAM) {
 830           /* fixme: the djvu context, document! */
 831
 832           ddjvu_document_release(lc->document);
 833           ddjvu_context_release(lc->context);
 834
 835           RelinquishMagickMemory(lc);
 836
 837           ThrowReaderException(ResourceLimitError,"Djvu initial message: unexpected type");
 838           return NULL;    /* error! */
 839   };
 840
 841   lc->streamid = message->m_newstream.streamid;
 842   ddjvu_message_pop(lc->context);
 843
 844   message = pump_data_until_message(lc,image);
 845   /* now process the messages: */
 846
 847
 848   if (message) do {
 849           process_message(message);
 850           ddjvu_message_pop(lc->context);
 851   } while ((message = ddjvu_message_peek(lc->context)));
 852
 853   /* fixme: i hope we have not read any messages pertinent(?) related to the page itself!  */
 854
 855   while (lc->pages == 0) {
 856           message = ddjvu_message_wait(lc->context);
 857           process_message(message);
 858           ddjvu_message_pop(lc->context);
 859   }
 860
 861   images=NewImageList();
 862   i=0;
 863   if (image_info->number_scenes != 0)
 864     i=image_info->scene;
 865   for ( ; i < (ssize_t) lc->pages; i++)
 866   {
 867     image=ReadOneDJVUImage(lc,i,image_info,exception);
 868     if (image == (Image *) NULL)
 869       break;
 870     image->scene=i;
 871     AppendImageToList(&images,CloneImageList(image,exception));
 872     images->extent=GetBlobSize(image);
 873     if (image_info->number_scenes != 0)
 874       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 875         break;
 876   }
 877   djvu_close_lc(lc);
 878   if (images != (Image *) NULL)
 879     (void) CloseBlob(images);
 880   if (image != (Image *) NULL)
 881     image=DestroyImageList(image);
 882
 883 #if 0
 884   if ((image->page.width == 0) && (image->page.height == 0))
 885     {
 886       image->page.width = image->columns+image->page.x;
 887       image->page.height = image->rows+image->page.y;
 888     }
 889   if (image->columns == 0 || image->rows == 0)
 890     {
 891       if (logging != MagickFalse)
 892         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 893           "exit ReadDJVUImage() with error.");
 894       ThrowReaderException(CorruptImageError,"CorruptImage");
 895     }
 896
 897   if (logging != MagickFalse)
 898     (void) LogMagickEvent(CoderEvent,GetMagickModule(),"exit ReadDJVUImage()");
 899 #endif
 900
 901
 902   return(GetFirstImageInList(images));
 903 }
 904 #endif
 905 \f
 906 /*
 907 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 908 %                                                                             %
 909 %                                                                             %
 910 %                                                                             %
 911 %   R e g i s t e r D J V U I m a g e                                         %
 912 %                                                                             %
 913 %                                                                             %
 914 %                                                                             %
 915 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 916 %
 917 %  RegisterDJVUImage() adds attributes for the DJVU image format to
 918 %  the list of supported formats.  The attributes include the image format
 919 %  tag, a method to read and/or write the format, whether the format
 920 %  supports the saving of more than one frame to the same file or blob,
 921 %  whether the format supports native in-memory I/O, and a brief
 922 %  description of the format.
 923 %
 924 %  The format of the RegisterDJVUImage method is:
 925 %
 926 %      size_t RegisterDJVUImage(void)
 927 %
 928 */
 929 ModuleExport size_t RegisterDJVUImage(void)
 930 {
 931   char
 932     version[MagickPathExtent];
 933
 934   MagickInfo
 935     *entry;
 936
 937   static const char
 938     *DJVUNote =
 939     {
 940       "See http://www.djvuzone.org/ for details about the DJVU format.  The\n"
 941       "DJVU 1.2 specification is available there and at\n"
 942       "ftp://swrinde.nde.swri.edu/pub/djvu/documents/."
 943     };
 944
 945   *version='\0';
 946 #if defined(DJVU_LIBDJVU_VER_STRING)
 947   (void) ConcatenateMagickString(version,"libdjvu ",MagickPathExtent);
 948   (void) ConcatenateMagickString(version,DJVU_LIBDJVU_VER_STRING,MagickPathExtent);
 949 #endif
 950   entry=AcquireMagickInfo("DJVU","DJVU","Deja vu");
 951 #if defined(MAGICKCORE_DJVU_DELEGATE)
 952   entry->decoder=(DecodeImageHandler *) ReadDJVUImage;
 953 #endif
 954   entry->magick=(IsImageFormatHandler *) IsDJVU;
 955   entry->flags|=CoderRawSupportFlag;
 956   entry->flags^=CoderAdjoinFlag;
 957   if (*version != '\0')
 958     entry->version=AcquireString(version);
 959   entry->note=AcquireString(DJVUNote);
 960   (void) RegisterMagickInfo(entry);
 961   return(MagickImageCoderSignature);
 962 }
 963 \f
 964 /*
 965 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 966 %                                                                             %
 967 %                                                                             %
 968 %                                                                             %
 969 %   U n r e g i s t e r D J V U I m a g e                                     %
 970 %                                                                             %
 971 %                                                                             %
 972 %                                                                             %
 973 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 974 %
 975 %  UnregisterDJVUImage() removes format registrations made by the
 976 %  DJVU module from the list of supported formats.
 977 %
 978 %  The format of the UnregisterDJVUImage method is:
 979 %
 980 %      UnregisterDJVUImage(void)
 981 %
 982 */
 983 ModuleExport void UnregisterDJVUImage(void)
 984 {
 985   (void) UnregisterMagickInfo("DJVU");
 986 }