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 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  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 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "magick/studio.h"
  43 #include "magick/blob.h"
  44 #include "magick/blob-private.h"
  45 #include "magick/cache.h"
  46 #include "magick/colormap.h"
  47 #include "magick/constitute.h"
  48 #include "magick/exception.h"
  49 #include "magick/exception-private.h"
  50 #include "magick/list.h"
  51 #include "magick/magick.h"
  52 #include "magick/memory_.h"
  53 #include "magick/monitor.h"
  54 #include "magick/monitor-private.h"
  55 #include "magick/quantum-private.h"
  56 #include "magick/static.h"
  57 #include "magick/string_.h"
  58 #include "magick/module.h"
  59 #if defined(MAGICKCORE_DJVU_DELEGATE)
  60 #include <libdjvu/ddjvuapi.h>
  61 #endif
  62 \f
  63 /*
  64 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  65 %                                                                             %
  66 %                                                                             %
  67 %                                                                             %
  68 %   I s D J V U                                                               %
  69 %                                                                             %
  70 %                                                                             %
  71 %                                                                             %
  72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  73 %
  74 %  IsDJVU() returns MagickTrue if the image format type, identified by the
  75 %  magick string, is DJVU.
  76 %
  77 %  The format of the IsDJVU method is:
  78 %
  79 %      MagickBooleanType IsDJVU(const unsigned char *magick,const size_t length)
  80 %
  81 %  A description of each parameter follows:
  82 %
  83 %    o magick: compare image format pattern against these bytes.
  84 %
  85 %    o length: Specifies the length of the magick string.
  86 %
  87 */
  88 static MagickBooleanType IsDJVU(const unsigned char *magick,const size_t length)
  89 {
  90   if (length < 8)
  91     return(MagickFalse);
  92   if (memcmp(magick,"AT&TFORM",8) == 0)
  93     return(MagickTrue);
  94   return(MagickFalse);
  95 }
  96 \f
  97 #if defined(MAGICKCORE_DJVU_DELEGATE)
  98 /*
  99 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 100 %                                                                             %
 101 %                                                                             %
 102 %                                                                             %
 103 %   R e a d D J V U I m a g e                                                 %
 104 %                                                                             %
 105 %                                                                             %
 106 %                                                                             %
 107 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 108 %
 109 %  ReadDJVUImage() reads DJVU image and returns it.  It allocates the memory
 110 %  necessary for the new Image structure and returns a pointer to the new
 111 %  image or set of images.
 112 %
 113 %  The format of the ReadDJVUImage method is:
 114 %
 115 %      Image *ReadDJVUImage(const ImageInfo *image_info,
 116 %        ExceptionInfo *exception)
 117 %
 118 %  A description of each parameter follows:
 119 %
 120 %    o image_info: the image info.
 121 %
 122 %    o exception: return any errors or warnings in this structure.
 123 %
 124 */
 125
 126 #if defined(__cplusplus) || defined(c_plusplus)
 127 extern "C" {
 128 #endif
 129
 130 typedef struct _LoadContext
 131    LoadContext;
 132
 133 struct _LoadContext
 134 {
 135   ddjvu_context_t* context;
 136   ddjvu_document_t *document;
 137   ddjvu_page_t *page;
 138   int streamid;
 139   int pages;
 140   Image *image;
 141 };
 142
 143 #define BLOCKSIZE  65536
 144 #if 0
 145 static void
 146 pump_data(Image *image, LoadContext* lc)
 147 {
 148         int blocksize = BLOCKSIZE;
 149         char data[BLOCKSIZE];
 150         int size;
 151
 152         /* i might check for a condition! */
 153         while ((size = (size_t) ReadBlob(image,(size_t) blocksize,data)) == blocksize) {
 154                 ddjvu_stream_write(lc->document, lc->streamid, data, size);
 155         }
 156         if (size)
 157                 ddjvu_stream_write(lc->document, lc->streamid, data, size);
 158         ddjvu_stream_close(lc->document, lc->streamid, 0);
 159 }
 160 #endif
 161
 162 /* returns NULL only after all is delivered! */
 163 static ddjvu_message_t*
 164 pump_data_until_message(LoadContext *lc,Image *image) /* ddjvu_context_t *context, type ddjvu_document_type_t */
 165 {
 166         size_t blocksize = BLOCKSIZE;
 167         unsigned char data[BLOCKSIZE];
 168         size_t size;
 169         ddjvu_message_t *message;
 170
 171         /* i might check for a condition! */
 172         while (!(message = ddjvu_message_peek(lc->context))
 173                && (size = (size_t) ReadBlob(image,(size_t) blocksize,data)) == blocksize) {
 174                 ddjvu_stream_write(lc->document, lc->streamid, (char *) data, size);
 175         }
 176         if (message)
 177                 return message;
 178         if (size)
 179                 ddjvu_stream_write(lc->document, lc->streamid, (char *) data, size);
 180         ddjvu_stream_close(lc->document, lc->streamid, 0);
 181         return NULL;
 182 }
 183 #define DEBUG 0
 184
 185 #if DEBUG
 186 static const char*
 187 message_tag_name(ddjvu_message_tag_t tag)
 188 {
 189    static char* names[] =
 190       {
 191          "ERROR",
 192          "INFO",
 193          "NEWSTREAM",
 194          "DOCINFO",
 195          "PAGEINFO",
 196          "RELAYOUT",
 197          "REDISPLAY",
 198          "CHUNK",
 199          "THUMBNAIL",
 200          "PROGRESS",
 201       };
 202    if (tag <= DDJVU_PROGRESS)
 203       return names[tag];
 204    else {
 205       /* bark! */
 206       return 0;
 207    }
 208 }
 209 #endif
 210
 211 /* write out nice info on the message,
 212  * and store in *user* data the info on progress.
 213  * */
 214 int
 215 process_message(ddjvu_message_t *message)
 216 {
 217
 218 #if 0
 219    ddjvu_context_t* context= message->m_any.context;
 220 #endif
 221
 222    if (! message)
 223       return(-1);
 224 #if DEBUG
 225    printf("*** %s: %s.\n",__FUNCTION__, message_tag_name(message->m_any.tag));
 226 #endif
 227
 228
 229    switch (message->m_any.tag){
 230    case DDJVU_DOCINFO:
 231    {
 232       ddjvu_document_t* document= message->m_any.document;
 233       /* ddjvu_document_decoding_status  is set by libdjvu! */
 234       /* we have some info on the document  */
 235       LoadContext *lc = (LoadContext *) ddjvu_document_get_user_data(document);
 236       lc->pages = ddjvu_document_get_pagenum(document);
 237 #if DEBUG
 238       printf("the doc has %d pages\n", ddjvu_document_get_pagenum(document));
 239 #endif
 240       break;
 241    }
 242    case DDJVU_CHUNK:
 243 #if DEBUG
 244            printf("the name of the chunk is: %s\n", message->m_chunk.chunkid);
 245 #endif
 246            break;
 247
 248
 249    case DDJVU_RELAYOUT:
 250    case DDJVU_PAGEINFO:
 251    {
 252 #if 0
 253       ddjvu_page_t* page = message->m_any.page;
 254       page_info* info = ddjvu_page_get_user_data(page);
 255
 256       printf("page decoding status: %d %s%s%s\n",
 257              ddjvu_page_decoding_status(page),
 258              status_color, status_name(ddjvu_page_decoding_status(page)), color_reset);
 259
 260       printf("the page LAYOUT changed: width x height: %d x %d @ %d dpi. Version %d, type %d\n",
 261              // printf("page info:\n width x height: %d x %d @ %d dpi, version %d, type %d\n",
 262              ddjvu_page_get_width(page),
 263              ddjvu_page_get_height(page),
 264              ddjvu_page_get_resolution(page),
 265              ddjvu_page_get_version(page),
 266              /* DDJVU_PAGETYPE_BITONAL */
 267              ddjvu_page_get_type(page));
 268
 269       info->info = 1;
 270 #endif
 271       break;
 272    }
 273
 274    case DDJVU_REDISPLAY:
 275    {
 276
 277 #if 0
 278     ddjvu_page_t* page = message->m_any.page;
 279       page_info* info = ddjvu_page_get_user_data(page);
 280
 281       printf("the page can/should be REDISPLAYED\n");
 282       info->display = 1;
 283 #endif
 284       break;
 285    }
 286
 287    case DDJVU_PROGRESS:
 288 #if DEBUG
 289            printf("PROGRESS:\n");
 290 #endif
 291            break;
 292    case DDJVU_ERROR:
 293            printf("simply ERROR!\n message:\t%s\nfunction:\t%s(file %s)\nlineno:\t%d\n",
 294                   message->m_error.message,
 295                   message->m_error.function,
 296                   message->m_error.filename,
 297                   message->m_error.lineno);
 298            break;
 299    case DDJVU_INFO:
 300 #if DEBUG
 301            printf("INFO: %s!\n", message->m_info.message);
 302 #endif
 303            break;
 304    default:
 305       printf("unexpected\n");
 306    };
 307   return(message->m_any.tag);
 308 }
 309
 310
 311 #if defined(__cplusplus) || defined(c_plusplus)
 312 }
 313 #endif
 314
 315
 316 #define RGB 1
 317
 318 /*
 319  * DjVu advertised readiness to provide bitmap: So get it!
 320  * we use the RGB format!
 321  */
 322 static void
 323 get_page_image(LoadContext *lc, ddjvu_page_t *page, int x, int y, int w, int h, QuantumInfo* quantum_info)
 324 {
 325   ddjvu_format_t
 326     *format;
 327
 328   ddjvu_page_type_t
 329     type;
 330
 331   Image
 332     *image;
 333
 334   int
 335     ret,
 336     stride;
 337
 338   unsigned char
 339     *q;
 340
 341         ddjvu_rect_t rect;
 342         rect.x = x;
 343         rect.y = y;
 344         rect.w = (unsigned int) w;             /* /10 */
 345         rect.h = (unsigned int) h;             /* /10 */
 346
 347         image = lc->image;
 348         type = ddjvu_page_get_type(lc->page);
 349
 350         /* stride of this temporary buffer: */
 351         stride = (type == DDJVU_PAGETYPE_BITONAL)?
 352                 (lc->image->columns + 7)/8:
 353                 lc->image->columns *3;
 354
 355         q = (unsigned char *) AcquireQuantumMemory(lc->image->rows,stride);
 356
 357
 358         format = ddjvu_format_create(
 359                 (type == DDJVU_PAGETYPE_BITONAL)?DDJVU_FORMAT_LSBTOMSB : DDJVU_FORMAT_RGB24,
 360                 /* DDJVU_FORMAT_RGB24
 361                  * DDJVU_FORMAT_RGBMASK32*/
 362                 /* DDJVU_FORMAT_RGBMASK32 */
 363                 0, NULL);
 364
 365 #if 0
 366         /* fixme:  ThrowReaderException is a macro, which uses  `exception' variable */
 367         if (format == NULL)
 368                 {
 369                         abort();
 370                         /* ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed"); */
 371                 }
 372
 373 #endif
 374         ddjvu_format_set_row_order(format, 1);
 375         ddjvu_format_set_y_direction(format, 1);
 376
 377         ret = ddjvu_page_render(page,
 378                                     DDJVU_RENDER_COLOR, /* ddjvu_render_mode_t */
 379                                     &rect,
 380                                     &rect,     /* mmc: ?? */
 381                                     format,
 382                                     stride, /* ?? */
 383                                     (char*)q);
 384         ddjvu_format_release(format);
 385
 386
 387         if (type == DDJVU_PAGETYPE_BITONAL) {
 388                 /*  */
 389 #if DEBUG
 390                 printf("%s: expanding BITONAL page/image\n", __FUNCTION__);
 391 #endif
 392                 register IndexPacket *indexes;
 393                 size_t bit, byte;
 394
 395                 for (y=0; y < (ssize_t) image->rows; y++)
 396                         {
 397                                 PixelPacket * o = QueueAuthenticPixels(image,0,y,image->columns,1,&image->exception);
 398                                 if (o == (PixelPacket *) NULL)
 399                                         break;
 400                                 indexes=GetAuthenticIndexQueue(image);
 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                                                 indexes[x]=(IndexPacket) (((byte & 0x01) != 0) ? 0x00 : 0x01);
 410                                                 bit++;
 411                                                 if (bit == 8)
 412                                                         bit=0;
 413                                                 byte>>=1;
 414                                         }
 415                                 if (SyncAuthenticPixels(image,&image->exception) == MagickFalse)
 416                                         break;
 417                         }
 418                 if (!image->ping)
 419                   SyncImage(image);
 420         } else {
 421 #if DEBUG
 422                 printf("%s: expanding PHOTO page/image\n", __FUNCTION__);
 423 #endif
 424                 /* now transfer line-wise: */
 425                 ssize_t i;
 426 #if 0
 427                 /* old: */
 428                 char* r;
 429 #else
 430                 register PixelPacket *r;
 431 #endif
 432
 433                 for (i = 0;i< (ssize_t) lc->image->rows; i++)
 434                         {
 435 #if DEBUG
 436                                if (i % 1000 == 0) printf("%d\n",i);
 437 #endif
 438                                r = QueueAuthenticPixels(lc->image,0,i,lc->image->columns,1,&image->exception);
 439
 440                                 ImportQuantumPixels(lc->image,
 441                                                     (CacheView *) NULL,
 442                                                     quantum_info,
 443                                                     RGBQuantum, /*GrayQuantum*/
 444                                                     q+i*stride,&image->exception);
 445                                 SyncAuthenticPixels(lc->image,&image->exception);
 446                         }
 447         }
 448         q=(unsigned char *) RelinquishMagickMemory(q);
 449 }
 450
 451
 452 #if defined(MAGICKCORE_DJVU_DELEGATE)
 453
 454 #if 0
 455 static int
 456 get_page_line(LoadContext *lc, int row, QuantumInfo* quantum_info)
 457 {
 458   ddjvu_format_t
 459     *format;
 460
 461   int
 462     ret;
 463
 464   size_t
 465     stride;
 466
 467   unsigned char
 468     *q;
 469
 470         ddjvu_rect_t rect, pagerect;
 471         rect.x = 0;
 472         rect.y = row;
 473         rect.w = lc->image->columns;             /* /10 */
 474         rect.h = 1;             /* /10 */
 475
 476         pagerect.x = 0;
 477         pagerect.y = 0;
 478         pagerect.w = lc->image->columns;
 479         pagerect.h = lc->image->rows;
 480
 481
 482         format = ddjvu_format_create(
 483 #if RGB
 484                 DDJVU_FORMAT_RGB24
 485 #else
 486                 DDJVU_FORMAT_GREY8
 487 #endif
 488                 ,
 489                 0, NULL);
 490         ddjvu_format_set_row_order(format, 1);
 491         ddjvu_format_set_y_direction(format, 1);
 492
 493         stride=1;
 494 #if RGB
 495         stride=3;
 496 #endif
 497         q = (unsigned char *) AcquireQuantumMemory(lc->image->columns,stride);
 498
 499         ret = ddjvu_page_render(lc->page,
 500                                     DDJVU_RENDER_COLOR, /* ddjvu_render_mode_t */
 501                                     &pagerect,
 502                                     &rect,     /* mmc: ?? */
 503                                     format,
 504                                     pagerect.w * 3, /* ?? */
 505                                     (char*)q);
 506
 507         ImportQuantumPixels(lc->image,
 508                             (CacheView *) NULL,
 509                             quantum_info,
 510 #if RGB
 511                             RGBQuantum
 512 #else
 513                             GrayQuantum
 514 #endif
 515                             ,q,&lc->image->exception);
 516         q=(unsigned char *) RelinquishMagickMemory(q);
 517         ddjvu_format_release(format);
 518         return ret;
 519 }
 520 #endif
 521 #endif
 522
 523 /*
 524 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 525 %                                                                             %
 526 %                                                                             %
 527 %                                                                             %
 528 %   R e a d O n e D J V U I m a g e                                           %
 529 %                                                                             %
 530 %                                                                             %
 531 %                                                                             %
 532 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 533 %
 534 %  ReadOneDJVUImage() reads a Portable Network Graphics (DJVU) image file
 535 %  (minus the 8-byte signature)  and returns it.  It allocates the memory
 536 %  necessary for the new Image structure and returns a pointer to the new
 537 %  image.
 538 %
 539 %  The format of the ReadOneDJVUImage method is:
 540 %
 541 %      Image *ReadOneDJVUImage(MngInfo *mng_info, const ImageInfo *image_info,
 542 %         ExceptionInfo *exception)
 543 %
 544 %  A description of each parameter follows:
 545 %
 546 %    o mng_info: Specifies a pointer to a MngInfo structure.
 547 %
 548 %    o image_info: the image info.
 549 %
 550 %    o exception: return any errors or warnings in this structure.
 551 %
 552 */
 553
 554 static inline double MagickMax(const double x,const double y)
 555 {
 556   if (x > y)
 557     return(x);
 558   return(y);
 559 }
 560
 561 static Image *ReadOneDJVUImage(LoadContext* lc,const int pagenum,
 562   const ImageInfo *image_info,ExceptionInfo *exception)
 563 {
 564   ddjvu_page_type_t
 565      type;
 566
 567   ddjvu_pageinfo_t info;
 568   QuantumInfo *quantum_info;
 569   ddjvu_message_t *message;
 570   Image *image;
 571   int logging;
 572   int tag;
 573
 574         /* so, we know that the page is there! Get its dimension, and  */
 575
 576         /* Read one DJVU image */
 577         image = lc->image;
 578
 579         /* register PixelPacket *q; */
 580
 581         logging=LogMagickEvent(CoderEvent,GetMagickModule(), "  enter ReadOneDJVUImage()");
 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         } while (!ddjvu_page_decoding_done(lc->page));
 608
 609         ddjvu_document_get_pageinfo(lc->document, pagenum, &info);
 610
 611         image->x_resolution = (float) info.dpi;
 612         image->y_resolution =(float) info.dpi;
 613         if (image_info->density != (char *) NULL)
 614           {
 615             int
 616               flags;
 617
 618             GeometryInfo
 619               geometry_info;
 620
 621             /*
 622               Set rendering resolution.
 623             */
 624             flags=ParseGeometry(image_info->density,&geometry_info);
 625             image->x_resolution=geometry_info.rho;
 626             image->y_resolution=geometry_info.sigma;
 627             if ((flags & SigmaValue) == 0)
 628               image->y_resolution=image->x_resolution;
 629             info.width*=image->x_resolution/info.dpi;
 630             info.height*=image->y_resolution/info.dpi;
 631             info.dpi=(ssize_t) MagickMax(image->x_resolution,image->y_resolution);
 632           }
 633         type = ddjvu_page_get_type(lc->page);
 634
 635         /* double -> float! */
 636         /* image->gamma = (float)ddjvu_page_get_gamma(lc->page); */
 637
 638         /* mmc:  set  image->depth  */
 639         /* mmc:  This from the type */
 640
 641         image->columns=(size_t) info.width;
 642         image->rows=(size_t) info.height;
 643
 644         /* mmc: bitonal should be palettized, and compressed! */
 645         if (type == DDJVU_PAGETYPE_BITONAL){
 646                 image->colorspace = GRAYColorspace;
 647                 image->storage_class = PseudoClass;
 648                 image->depth =  8UL;    /* i only support that? */
 649                 image->colors= 2;
 650                 if (AcquireImageColormap(image,image->colors) == MagickFalse)
 651                   ThrowReaderException(ResourceLimitError,
 652                    "MemoryAllocationFailed");
 653         } else {
 654                 image->colorspace = RGBColorspace;
 655                 image->storage_class = DirectClass;
 656                 /* fixme:  MAGICKCORE_QUANTUM_DEPTH ?*/
 657                 image->depth =  8UL;    /* i only support that? */
 658
 659                 image->matte = MagickTrue;
 660                 /* is this useful? */
 661         }
 662 #if DEBUG
 663         printf("now filling %.20g x %.20g\n",(double) image->columns,(double)
 664           image->rows);
 665 #endif
 666
 667
 668 #if 1                           /* per_line */
 669         quantum_info=AcquireQuantumInfo(image_info,image);
 670         if (quantum_info == (QuantumInfo *) NULL)
 671           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 672
 673         /* q = QueueAuthenticPixels(image,0,0,image->columns,image->rows); */
 674         get_page_image(lc, lc->page, 0, 0, info.width, info.height, quantum_info);
 675 #else
 676         int i;
 677         for (i = 0;i< image->rows; i++)
 678                 {
 679                         printf("%d\n",i);
 680                         q = QueueAuthenticPixels(image,0,i,image->columns,1);
 681                         get_page_line(lc, i, quantum_info);
 682                         SyncAuthenticPixels(image);
 683                 }
 684
 685 #endif /* per_line */
 686
 687
 688 #if DEBUG
 689         printf("END: finished filling %.20g x %.20g\n",(double) image->columns,
 690           (double) image->rows);
 691 #endif
 692
 693         if (!image->ping)
 694           SyncImage(image);
 695         quantum_info=DestroyQuantumInfo(quantum_info);
 696         /* indexes=GetAuthenticIndexQueue(image); */
 697         /* mmc: ??? Convert PNM pixels to runlength-encoded MIFF packets. */
 698         /* image->colors =  */
 699
 700         /* how is the line padding  / stride? */
 701
 702         if (lc->page) {
 703                 ddjvu_page_release(lc->page);
 704                 lc->page = NULL;
 705         }
 706
 707         /* image->page.y=mng_info->y_off[mng_info->object_id]; */
 708         if (tag == 0)
 709           image=DestroyImage(image);
 710         return image;
 711         /* end of reading one DJVU page/image */
 712 }
 713
 714 #if 0
 715 /* palette */
 716   if (AcquireImageColormap(image,2) == MagickFalse)
 717     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 718   /*
 719     Monochrome colormap.   mmc: this the default!
 720   */
 721   image->colormap[0].red=QuantumRange;
 722   image->colormap[0].green=QuantumRange;
 723   image->colormap[0].blue=QuantumRange;
 724   image->colormap[1].red=0;
 725   image->colormap[1].green=0;
 726   image->colormap[1].blue=0;
 727 #endif
 728
 729 static void djvu_close_lc(LoadContext* lc)
 730 {
 731         if (lc->document)
 732                 ddjvu_document_release(lc->document);
 733         if (lc->context)
 734                 ddjvu_context_release(lc->context);
 735         if (lc->page)
 736                 ddjvu_page_release(lc->page);
 737         RelinquishMagickMemory(lc);
 738 }
 739
 740 static Image *ReadDJVUImage(const ImageInfo *image_info,
 741   ExceptionInfo *exception)
 742 {
 743   const char
 744     *url;
 745
 746   ddjvu_message_t
 747     *message;
 748
 749   Image
 750     *image,
 751     *images;
 752
 753   int
 754     logging,
 755     use_cache;
 756
 757   LoadContext
 758     *lc;
 759
 760   MagickBooleanType
 761     status;
 762
 763   register ssize_t
 764     i;
 765
 766   /*
 767    * Open image file.
 768    */
 769   assert(image_info != (const ImageInfo *) NULL);
 770   assert(image_info->signature == MagickSignature);
 771
 772
 773   if (image_info->debug != MagickFalse)
 774     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s", image_info->filename);
 775
 776   assert(exception != (ExceptionInfo *) NULL);
 777   assert(exception->signature == MagickSignature);
 778
 779
 780   logging = LogMagickEvent(CoderEvent,GetMagickModule(),"enter ReadDJVUImage()");
 781
 782   image = AcquireImage(image_info); /* 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) ResetMagickMemory(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="http://www.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     if (image_info->number_scenes != 0)
 873       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 874         break;
 875   }
 876   djvu_close_lc(lc);
 877   (void) CloseBlob(images);
 878   if (image != (Image *) NULL)
 879     image=DestroyImageList(image);
 880
 881 #if 0
 882   if ((image->page.width == 0) && (image->page.height == 0))
 883     {
 884       image->page.width = image->columns+image->page.x;
 885       image->page.height = image->rows+image->page.y;
 886     }
 887   if (image->columns == 0 || image->rows == 0)
 888     {
 889       if (logging != MagickFalse)
 890         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 891           "exit ReadDJVUImage() with error.");
 892       ThrowReaderException(CorruptImageError,"CorruptImage");
 893     }
 894
 895   if (logging != MagickFalse)
 896     (void) LogMagickEvent(CoderEvent,GetMagickModule(),"exit ReadDJVUImage()");
 897 #endif
 898
 899
 900   return(GetFirstImageInList(images));
 901 }
 902 #endif
 903 \f
 904 /*
 905 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 906 %                                                                             %
 907 %                                                                             %
 908 %                                                                             %
 909 %   R e g i s t e r D J V U I m a g e                                         %
 910 %                                                                             %
 911 %                                                                             %
 912 %                                                                             %
 913 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 914 %
 915 %  RegisterDJVUImage() adds attributes for the DJVU image format to
 916 %  the list of supported formats.  The attributes include the image format
 917 %  tag, a method to read and/or write the format, whether the format
 918 %  supports the saving of more than one frame to the same file or blob,
 919 %  whether the format supports native in-memory I/O, and a brief
 920 %  description of the format.
 921 %
 922 %  The format of the RegisterDJVUImage method is:
 923 %
 924 %      size_t RegisterDJVUImage(void)
 925 %
 926 */
 927 ModuleExport size_t RegisterDJVUImage(void)
 928 {
 929   char
 930     version[MaxTextExtent];
 931
 932   MagickInfo
 933     *entry;
 934
 935   static const char
 936     *DJVUNote =
 937     {
 938       "See http://www.djvuzone.org/ for details about the DJVU format.  The\n"
 939       "DJVU 1.2 specification is available there and at\n"
 940       "ftp://swrinde.nde.swri.edu/pub/djvu/documents/."
 941     };
 942
 943   *version='\0';
 944 #if defined(DJVU_LIBDJVU_VER_STRING)
 945   (void) ConcatenateMagickString(version,"libdjvu ",MaxTextExtent);
 946   (void) ConcatenateMagickString(version,DJVU_LIBDJVU_VER_STRING,MaxTextExtent);
 947 #endif
 948   entry=SetMagickInfo("DJVU");
 949 #if defined(MAGICKCORE_DJVU_DELEGATE)
 950   entry->decoder=(DecodeImageHandler *) ReadDJVUImage;
 951 #endif
 952   entry->raw=MagickTrue;
 953   entry->magick=(IsImageFormatHandler *) IsDJVU;
 954   entry->adjoin=MagickFalse;
 955   entry->thread_support=MagickTrue;
 956   entry->description=AcquireString("Déjà vu");
 957   entry->module=AcquireString("DJVU");
 958   if (*version != '\0')
 959     entry->version=AcquireString(version);
 960   entry->note=AcquireString(DJVUNote);
 961   (void) RegisterMagickInfo(entry);
 962   return(MagickImageCoderSignature);
 963 }
 964 \f
 965 /*
 966 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 967 %                                                                             %
 968 %                                                                             %
 969 %                                                                             %
 970 %   U n r e g i s t e r D J V U I m a g e                                     %
 971 %                                                                             %
 972 %                                                                             %
 973 %                                                                             %
 974 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 975 %
 976 %  UnregisterDJVUImage() removes format registrations made by the
 977 %  DJVU module from the list of supported formats.
 978 %
 979 %  The format of the UnregisterDJVUImage method is:
 980 %
 981 %      UnregisterDJVUImage(void)
 982 %
 983 */
 984 ModuleExport void UnregisterDJVUImage(void)
 985 {
 986   (void) UnregisterMagickInfo("DJVU");
 987 }