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 "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/list.h"
  51 #include "MagickCore/magick.h"
  52 #include "MagickCore/memory_.h"
  53 #include "MagickCore/monitor.h"
  54 #include "MagickCore/monitor-private.h"
  55 #include "MagickCore/pixel-accessor.h"
  56 #include "MagickCore/quantum-private.h"
  57 #include "MagickCore/static.h"
  58 #include "MagickCore/string_.h"
  59 #include "MagickCore/module.h"
  60 #if defined(MAGICKCORE_DJVU_DELEGATE)
  61 #include <libdjvu/ddjvuapi.h>
  62 #endif
  63 \f
  64 /*
  65 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  66 %                                                                             %
  67 %                                                                             %
  68 %                                                                             %
  69 %   I s D J V U                                                               %
  70 %                                                                             %
  71 %                                                                             %
  72 %                                                                             %
  73 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  74 %
  75 %  IsDJVU() returns MagickTrue if the image format type, identified by the
  76 %  magick string, is DJVU.
  77 %
  78 %  The format of the IsDJVU method is:
  79 %
  80 %      MagickBooleanType IsDJVU(const unsigned char *magick,const size_t length)
  81 %
  82 %  A description of each parameter follows:
  83 %
  84 %    o magick: compare image format pattern against these bytes.
  85 %
  86 %    o length: Specifies the length of the magick string.
  87 %
  88 */
  89 static MagickBooleanType IsDJVU(const unsigned char *magick,const size_t length)
  90 {
  91   if (length < 8)
  92     return(MagickFalse);
  93   if (memcmp(magick,"AT&TFORM",8) == 0)
  94     return(MagickTrue);
  95   return(MagickFalse);
  96 }
  97 \f
  98 #if defined(MAGICKCORE_DJVU_DELEGATE)
  99 /*
 100 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 101 %                                                                             %
 102 %                                                                             %
 103 %                                                                             %
 104 %   R e a d D J V U I m a g e                                                 %
 105 %                                                                             %
 106 %                                                                             %
 107 %                                                                             %
 108 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 109 %
 110 %  ReadDJVUImage() reads DJVU image and returns it.  It allocates the memory
 111 %  necessary for the new Image structure and returns a pointer to the new
 112 %  image or set of images.
 113 %
 114 %  The format of the ReadDJVUImage method is:
 115 %
 116 %      Image *ReadDJVUImage(const ImageInfo *image_info,
 117 %        ExceptionInfo *exception)
 118 %
 119 %  A description of each parameter follows:
 120 %
 121 %    o image_info: the image info.
 122 %
 123 %    o exception: return any errors or warnings in this structure.
 124 %
 125 */
 126
 127 #if defined(__cplusplus) || defined(c_plusplus)
 128 extern "C" {
 129 #endif
 130
 131 typedef struct _LoadContext
 132    LoadContext;
 133
 134 struct _LoadContext
 135 {
 136   ddjvu_context_t* context;
 137   ddjvu_document_t *document;
 138   ddjvu_page_t *page;
 139   int streamid;
 140   int pages;
 141   Image *image;
 142 };
 143
 144 #define BLOCKSIZE  65536
 145 #if 0
 146 static void
 147 pump_data(Image *image, LoadContext* lc)
 148 {
 149         int blocksize = BLOCKSIZE;
 150         char data[BLOCKSIZE];
 151         int size;
 152
 153         /* i might check for a condition! */
 154         while ((size = (size_t) ReadBlob(image,(size_t) blocksize,data)) == blocksize) {
 155                 ddjvu_stream_write(lc->document, lc->streamid, data, size);
 156         }
 157         if (size)
 158                 ddjvu_stream_write(lc->document, lc->streamid, data, size);
 159         ddjvu_stream_close(lc->document, lc->streamid, 0);
 160 }
 161 #endif
 162
 163 /* returns NULL only after all is delivered! */
 164 static ddjvu_message_t*
 165 pump_data_until_message(LoadContext *lc,Image *image) /* ddjvu_context_t *context, type ddjvu_document_type_t */
 166 {
 167         size_t blocksize = BLOCKSIZE;
 168         unsigned char data[BLOCKSIZE];
 169         size_t size;
 170         ddjvu_message_t *message;
 171
 172         /* i might check for a condition! */
 173         while (!(message = ddjvu_message_peek(lc->context))
 174                && (size = (size_t) ReadBlob(image,(size_t) blocksize,data)) == blocksize) {
 175                 ddjvu_stream_write(lc->document, lc->streamid, (char *) data, size);
 176         }
 177         if (message)
 178                 return message;
 179         if (size)
 180                 ddjvu_stream_write(lc->document, lc->streamid, (char *) data, size);
 181         ddjvu_stream_close(lc->document, lc->streamid, 0);
 182         return NULL;
 183 }
 184 #define DEBUG 0
 185
 186 #if DEBUG
 187 static const char*
 188 message_tag_name(ddjvu_message_tag_t tag)
 189 {
 190    static char* names[] =
 191       {
 192          "ERROR",
 193          "INFO",
 194          "NEWSTREAM",
 195          "DOCINFO",
 196          "PAGEINFO",
 197          "RELAYOUT",
 198          "REDISPLAY",
 199          "CHUNK",
 200          "THUMBNAIL",
 201          "PROGRESS",
 202       };
 203    if (tag <= DDJVU_PROGRESS)
 204       return names[tag];
 205    else {
 206       /* bark! */
 207       return 0;
 208    }
 209 }
 210 #endif
 211
 212 /* write out nice info on the message,
 213  * and store in *user* data the info on progress.
 214  * */
 215 int
 216 process_message(ddjvu_message_t *message)
 217 {
 218
 219 #if 0
 220    ddjvu_context_t* context= message->m_any.context;
 221 #endif
 222
 223    if (! message)
 224       return(-1);
 225 #if DEBUG
 226    printf("*** %s: %s.\n",__FUNCTION__, message_tag_name(message->m_any.tag));
 227 #endif
 228
 229
 230    switch (message->m_any.tag){
 231    case DDJVU_DOCINFO:
 232    {
 233       ddjvu_document_t* document= message->m_any.document;
 234       /* ddjvu_document_decoding_status  is set by libdjvu! */
 235       /* we have some info on the document  */
 236       LoadContext *lc = (LoadContext *) ddjvu_document_get_user_data(document);
 237       lc->pages = ddjvu_document_get_pagenum(document);
 238 #if DEBUG
 239       printf("the doc has %d pages\n", ddjvu_document_get_pagenum(document));
 240 #endif
 241       break;
 242    }
 243    case DDJVU_CHUNK:
 244 #if DEBUG
 245            printf("the name of the chunk is: %s\n", message->m_chunk.chunkid);
 246 #endif
 247            break;
 248
 249
 250    case DDJVU_RELAYOUT:
 251    case DDJVU_PAGEINFO:
 252    {
 253 #if 0
 254       ddjvu_page_t* page = message->m_any.page;
 255       page_info* info = ddjvu_page_get_user_data(page);
 256
 257       printf("page decoding status: %d %s%s%s\n",
 258              ddjvu_page_decoding_status(page),
 259              status_color, status_name(ddjvu_page_decoding_status(page)), color_reset);
 260
 261       printf("the page LAYOUT changed: width x height: %d x %d @ %d dpi. Version %d, type %d\n",
 262              // printf("page info:\n width x height: %d x %d @ %d dpi, version %d, type %d\n",
 263              ddjvu_page_get_width(page),
 264              ddjvu_page_get_height(page),
 265              ddjvu_page_get_resolution(page),
 266              ddjvu_page_get_version(page),
 267              /* DDJVU_PAGETYPE_BITONAL */
 268              ddjvu_page_get_type(page));
 269
 270       info->info = 1;
 271 #endif
 272       break;
 273    }
 274
 275    case DDJVU_REDISPLAY:
 276    {
 277
 278 #if 0
 279     ddjvu_page_t* page = message->m_any.page;
 280       page_info* info = ddjvu_page_get_user_data(page);
 281
 282       printf("the page can/should be REDISPLAYED\n");
 283       info->display = 1;
 284 #endif
 285       break;
 286    }
 287
 288    case DDJVU_PROGRESS:
 289 #if DEBUG
 290            printf("PROGRESS:\n");
 291 #endif
 292            break;
 293    case DDJVU_ERROR:
 294            printf("simply ERROR!\n message:\t%s\nfunction:\t%s(file %s)\nlineno:\t%d\n",
 295                   message->m_error.message,
 296                   message->m_error.function,
 297                   message->m_error.filename,
 298                   message->m_error.lineno);
 299            break;
 300    case DDJVU_INFO:
 301 #if DEBUG
 302            printf("INFO: %s!\n", message->m_info.message);
 303 #endif
 304            break;
 305    default:
 306       printf("unexpected\n");
 307    };
 308   return(message->m_any.tag);
 309 }
 310
 311
 312 #if defined(__cplusplus) || defined(c_plusplus)
 313 }
 314 #endif
 315
 316
 317 #define RGB 1
 318
 319 /*
 320  * DjVu advertised readiness to provide bitmap: So get it!
 321  * we use the RGB format!
 322  */
 323 static void
 324 get_page_image(LoadContext *lc, ddjvu_page_t *page, int x, int y, int w, int h, const ImageInfo *image_info, ExceptionInfo *exception ) {
 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                 (image->columns + 7)/8 : image->columns *3;
 353
 354         q = (unsigned char *) AcquireQuantumMemory(image->rows,stride);
 355         if (q == (unsigned char *) NULL)
 356           return;
 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         (void) ret;
 385         ddjvu_format_release(format);
 386
 387
 388         if (type == DDJVU_PAGETYPE_BITONAL) {
 389                 /*  */
 390 #if DEBUG
 391                 printf("%s: expanding BITONAL page/image\n", __FUNCTION__);
 392 #endif
 393                 size_t bit, byte;
 394
 395                 for (y=0; y < (ssize_t) image->rows; y++)
 396                         {
 397                                 Quantum * o = QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 398                                 if (o == (Quantum *) NULL)
 399                                         break;
 400                                 bit=0;
 401                                 byte=0;
 402
 403                                 /* fixme:  the non-aligned, last =<7 bits ! that's ok!!!*/
 404                                 for (x= 0; x < (ssize_t) image->columns; x++)
 405                                         {
 406                                                 if (bit == 0) byte= (size_t) q[(y * stride) + (x / 8)];
 407
 408                                                 SetPixelIndex(image,(Quantum) (((byte & 0x01) != 0) ? 0x00 : 0x01),o);
 409                                                 bit++;
 410                                                 if (bit == 8)
 411                                                         bit=0;
 412                                                 byte>>=1;
 413                                           o+=GetPixelChannels(image);
 414                                         }
 415                                 if (SyncAuthenticPixels(image,exception) == MagickFalse)
 416                                         break;
 417                         }
 418                 if (!image->ping)
 419                   SyncImage(image,exception);
 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 Quantum *r;
 431                 unsigned char *s;
 432 #endif
 433                 s=q;
 434                 for (i = 0;i< (ssize_t) image->rows; i++)
 435                         {
 436 #if DEBUG
 437                                if (i % 1000 == 0) printf("%d\n",i);
 438 #endif
 439                                r = QueueAuthenticPixels(image,0,i,image->columns,1,exception);
 440                                if (r == (Quantum *) NULL)
 441                                  break;
 442                   for (x=0; x < (ssize_t) image->columns; x++)
 443                   {
 444                     SetPixelRed(image,ScaleCharToQuantum(*s++),r);
 445                     SetPixelGreen(image,ScaleCharToQuantum(*s++),r);
 446                     SetPixelBlue(image,ScaleCharToQuantum(*s++),r);
 447                     r+=GetPixelChannels(image);
 448                   }
 449
 450                               SyncAuthenticPixels(image,exception);
 451                         }
 452         }
 453         q=(unsigned char *) RelinquishMagickMemory(q);
 454 }
 455
 456
 457 #if defined(MAGICKCORE_DJVU_DELEGATE)
 458
 459 #if 0
 460 static int
 461 get_page_line(LoadContext *lc, int row, QuantumInfo* quantum_info)
 462 {
 463   ddjvu_format_t
 464     *format;
 465
 466   int
 467     ret;
 468
 469   size_t
 470     stride;
 471
 472   unsigned char
 473     *q;
 474
 475         ddjvu_rect_t rect, pagerect;
 476         rect.x = 0;
 477         rect.y = row;
 478         rect.w = lc->image->columns;             /* /10 */
 479         rect.h = 1;             /* /10 */
 480
 481         pagerect.x = 0;
 482         pagerect.y = 0;
 483         pagerect.w = lc->image->columns;
 484         pagerect.h = lc->image->rows;
 485
 486
 487         format = ddjvu_format_create(
 488 #if RGB
 489                 DDJVU_FORMAT_RGB24
 490 #else
 491                 DDJVU_FORMAT_GREY8
 492 #endif
 493                 ,
 494                 0, NULL);
 495         ddjvu_format_set_row_order(format, 1);
 496         ddjvu_format_set_y_direction(format, 1);
 497
 498         stride=1;
 499 #if RGB
 500         stride=3;
 501 #endif
 502         q = (unsigned char *) AcquireQuantumMemory(lc->image->columns,stride);
 503
 504         ret = ddjvu_page_render(lc->page,
 505                                     DDJVU_RENDER_COLOR, /* ddjvu_render_mode_t */
 506                                     &pagerect,
 507                                     &rect,     /* mmc: ?? */
 508                                     format,
 509                                     pagerect.w * 3, /* ?? */
 510                                     (char*)q);
 511
 512         ImportQuantumPixels(lc->image,
 513                             (CacheView *) NULL,
 514                             quantum_info,
 515 #if RGB
 516                             RGBQuantum
 517 #else
 518                             GrayQuantum
 519 #endif
 520                             ,q,&lc->image->exception);
 521         q=(unsigned char *) RelinquishMagickMemory(q);
 522         ddjvu_format_release(format);
 523         return ret;
 524 }
 525 #endif
 526 #endif
 527
 528 /*
 529 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 530 %                                                                             %
 531 %                                                                             %
 532 %                                                                             %
 533 %   R e a d O n e D J V U I m a g e                                           %
 534 %                                                                             %
 535 %                                                                             %
 536 %                                                                             %
 537 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 538 %
 539 %  ReadOneDJVUImage() reads a Portable Network Graphics (DJVU) image file
 540 %  (minus the 8-byte signature)  and returns it.  It allocates the memory
 541 %  necessary for the new Image structure and returns a pointer to the new
 542 %  image.
 543 %
 544 %  The format of the ReadOneDJVUImage method is:
 545 %
 546 %      Image *ReadOneDJVUImage(MngInfo *mng_info, const ImageInfo *image_info,
 547 %         ExceptionInfo *exception)
 548 %
 549 %  A description of each parameter follows:
 550 %
 551 %    o mng_info: Specifies a pointer to a MngInfo structure.
 552 %
 553 %    o image_info: the image info.
 554 %
 555 %    o exception: return any errors or warnings in this structure.
 556 %
 557 */
 558
 559 static inline double MagickMax(const double x,const double y)
 560 {
 561   if (x > y)
 562     return(x);
 563   return(y);
 564 }
 565
 566 static Image *ReadOneDJVUImage(LoadContext* lc,const int pagenum,
 567   const ImageInfo *image_info,ExceptionInfo *exception)
 568 {
 569   ddjvu_page_type_t
 570      type;
 571
 572   ddjvu_pageinfo_t info;
 573   ddjvu_message_t *message;
 574   Image *image;
 575   int logging;
 576   int tag;
 577
 578         /* so, we know that the page is there! Get its dimension, and  */
 579
 580         /* Read one DJVU image */
 581         image = lc->image;
 582
 583         /* register Quantum *q; */
 584
 585         logging=LogMagickEvent(CoderEvent,GetMagickModule(), "  enter ReadOneDJVUImage()");
 586         (void) logging;
 587
 588 #if DEBUG
 589         printf("====  Loading the page %d\n", pagenum);
 590 #endif
 591         lc->page = ddjvu_page_create_by_pageno(lc->document, pagenum); /*  0? */
 592
 593         /* pump data untill the page is ready for rendering. */
 594         tag=(-1);
 595         do {
 596                 while ((message = ddjvu_message_peek(lc->context)))
 597                         {
 598                                 tag=process_message(message);
 599                                 if (tag == 0) break;
 600                                 ddjvu_message_pop(lc->context);
 601                         }
 602                 /* fixme: maybe exit? */
 603                 /* if (lc->error) break; */
 604
 605                 message = pump_data_until_message(lc,image);
 606                 if (message)
 607                         do {
 608                                 tag=process_message(message);
 609                                 if (tag == 0) break;
 610                                 ddjvu_message_pop(lc->context);
 611                         } while ((message = ddjvu_message_peek(lc->context)));
 612         } while (!ddjvu_page_decoding_done(lc->page));
 613
 614         ddjvu_document_get_pageinfo(lc->document, pagenum, &info);
 615
 616         image->resolution.x = (float) info.dpi;
 617         image->resolution.y =(float) info.dpi;
 618         if (image_info->density != (char *) NULL)
 619           {
 620             int
 621               flags;
 622
 623             GeometryInfo
 624               geometry_info;
 625
 626             /*
 627               Set rendering resolution.
 628             */
 629             flags=ParseGeometry(image_info->density,&geometry_info);
 630             image->resolution.x=geometry_info.rho;
 631             image->resolution.y=geometry_info.sigma;
 632             if ((flags & SigmaValue) == 0)
 633               image->resolution.y=image->resolution.x;
 634             info.width*=image->resolution.x/info.dpi;
 635             info.height*=image->resolution.y/info.dpi;
 636             info.dpi=(ssize_t) MagickMax(image->resolution.x,image->resolution.y);
 637           }
 638         type = ddjvu_page_get_type(lc->page);
 639
 640         /* double -> float! */
 641         /* image->gamma = (float)ddjvu_page_get_gamma(lc->page); */
 642
 643         /* mmc:  set  image->depth  */
 644         /* mmc:  This from the type */
 645
 646         image->columns=(size_t) info.width;
 647         image->rows=(size_t) info.height;
 648
 649         /* mmc: bitonal should be palettized, and compressed! */
 650         if (type == DDJVU_PAGETYPE_BITONAL){
 651                 image->colorspace = GRAYColorspace;
 652                 image->storage_class = PseudoClass;
 653                 image->depth =  8UL;    /* i only support that? */
 654                 image->colors= 2;
 655                 if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 656                   ThrowReaderException(ResourceLimitError,
 657                    "MemoryAllocationFailed");
 658         } else {
 659                 image->colorspace = RGBColorspace;
 660                 image->storage_class = DirectClass;
 661                 /* fixme:  MAGICKCORE_QUANTUM_DEPTH ?*/
 662                 image->depth =  8UL;    /* i only support that? */
 663
 664                 image->matte = MagickTrue;
 665                 /* is this useful? */
 666         }
 667 #if DEBUG
 668         printf("now filling %.20g x %.20g\n",(double) image->columns,(double)
 669           image->rows);
 670 #endif
 671
 672
 673 #if 1                           /* per_line */
 674
 675         /* q = QueueAuthenticPixels(image,0,0,image->columns,image->rows); */
 676         get_page_image(lc, lc->page, 0, 0, info.width, info.height, image_info,
 677           exception);
 678 #else
 679         int i;
 680         for (i = 0;i< image->rows; i++)
 681                 {
 682                         printf("%d\n",i);
 683                         q = QueueAuthenticPixels(image,0,i,image->columns,1);
 684                         get_page_line(lc, i, quantum_info);
 685                         SyncAuthenticPixels(image);
 686                 }
 687
 688 #endif /* per_line */
 689
 690
 691 #if DEBUG
 692         printf("END: finished filling %.20g x %.20g\n",(double) image->columns,
 693           (double) image->rows);
 694 #endif
 695
 696         if (!image->ping)
 697           SyncImage(image,exception);
 698         /* mmc: ??? Convert PNM pixels to runlength-encoded MIFF packets. */
 699         /* image->colors =  */
 700
 701         /* how is the line padding  / stride? */
 702
 703         if (lc->page) {
 704                 ddjvu_page_release(lc->page);
 705                 lc->page = NULL;
 706         }
 707
 708         /* image->page.y=mng_info->y_off[mng_info->object_id]; */
 709         if (tag == 0)
 710           image=DestroyImage(image);
 711         return image;
 712         /* end of reading one DJVU page/image */
 713 }
 714
 715 #if 0
 716 /* palette */
 717   if (AcquireImageColormap(image,2,exception) == MagickFalse)
 718     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 719   /*
 720     Monochrome colormap.   mmc: this the default!
 721   */
 722   image->colormap[0].red=QuantumRange;
 723   image->colormap[0].green=QuantumRange;
 724   image->colormap[0].blue=QuantumRange;
 725   image->colormap[1].red=0;
 726   image->colormap[1].green=0;
 727   image->colormap[1].blue=0;
 728 #endif
 729
 730 static void djvu_close_lc(LoadContext* lc)
 731 {
 732         if (lc->document)
 733                 ddjvu_document_release(lc->document);
 734         if (lc->context)
 735                 ddjvu_context_release(lc->context);
 736         if (lc->page)
 737                 ddjvu_page_release(lc->page);
 738         RelinquishMagickMemory(lc);
 739 }
 740
 741 static Image *ReadDJVUImage(const ImageInfo *image_info,
 742   ExceptionInfo *exception)
 743 {
 744   const char
 745     *url;
 746
 747   ddjvu_message_t
 748     *message;
 749
 750   Image
 751     *image,
 752     *images;
 753
 754   int
 755     logging,
 756     use_cache;
 757
 758   LoadContext
 759     *lc;
 760
 761   MagickBooleanType
 762     status;
 763
 764   register ssize_t
 765     i;
 766
 767   /*
 768    * Open image file.
 769    */
 770   assert(image_info != (const ImageInfo *) NULL);
 771   assert(image_info->signature == MagickSignature);
 772
 773
 774   if (image_info->debug != MagickFalse)
 775     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s", image_info->filename);
 776
 777   assert(exception != (ExceptionInfo *) NULL);
 778   assert(exception->signature == MagickSignature);
 779
 780
 781   logging = LogMagickEvent(CoderEvent,GetMagickModule(),"enter ReadDJVUImage()");
 782   (void) logging;
 783
 784   image = AcquireImage(image_info,exception); /* mmc: ?? */
 785
 786
 787   lc = (LoadContext *) NULL;
 788   status = OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 789   if (status == MagickFalse)
 790     ThrowReaderException(FileOpenError,"UnableToOpenFile");
 791   /*
 792     Verify DJVU signature.
 793   */
 794 #if 0
 795   count = ReadBlob(image,8,(unsigned char *) magic_number);
 796
 797   /* IsDJVU(const unsigned char *magick,const size_t length) */
 798   if (memcmp(magic_number,"AT&TFORM",8) != 0)
 799     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 800 #endif
 801
 802
 803   /*
 804    * Allocate a LoadContext structure.
 805    */
 806   lc = (LoadContext *) AcquireMagickMemory(sizeof(*lc));
 807   if (lc == NULL)
 808     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 809
 810
 811   /*
 812    * Initialize members of the MngInfo structure.
 813    */
 814   (void) ResetMagickMemory(lc,0,sizeof(LoadContext));
 815
 816   lc->image = image;
 817   lc->pages = 0;
 818   lc->context = ddjvu_context_create("ImageMagick djvu loader"); /* g_program_name */
 819
 820   ddjvu_cache_set_size(lc->context, 1); /* right? */
 821   use_cache = 0;
 822   /* document: here we don't have a filename, but, for the sake of generality, a FILE* ! */
 823   url="http://www.imagemagick.org/fake.djvu";
 824   lc->document = ddjvu_document_create(lc->context, url, use_cache); /* don't cache */
 825   ddjvu_document_set_user_data(lc->document, lc);
 826
 827
 828   /* now we wait the message-request for data: */
 829   message = ddjvu_message_wait(lc->context);
 830
 831   if (message->m_any.tag != DDJVU_NEWSTREAM) {
 832           /* fixme: the djvu context, document! */
 833
 834           ddjvu_document_release(lc->document);
 835           ddjvu_context_release(lc->context);
 836
 837           RelinquishMagickMemory(lc);
 838
 839           ThrowReaderException(ResourceLimitError,"Djvu initial message: unexpected type");
 840           return NULL;    /* error! */
 841   };
 842
 843   lc->streamid = message->m_newstream.streamid;
 844   ddjvu_message_pop(lc->context);
 845
 846   message = pump_data_until_message(lc,image);
 847   /* now process the messages: */
 848
 849
 850   if (message) do {
 851           process_message(message);
 852           ddjvu_message_pop(lc->context);
 853   } while ((message = ddjvu_message_peek(lc->context)));
 854
 855   /* fixme: i hope we have not read any messages pertinent(?) related to the page itself!  */
 856
 857   while (lc->pages == 0) {
 858           message = ddjvu_message_wait(lc->context);
 859           process_message(message);
 860           ddjvu_message_pop(lc->context);
 861   }
 862
 863   images=NewImageList();
 864   i=0;
 865   if (image_info->number_scenes != 0)
 866     i=image_info->scene;
 867   for ( ; i < (ssize_t) lc->pages; i++)
 868   {
 869     image=ReadOneDJVUImage(lc,i,image_info,exception);
 870     if (image == (Image *) NULL)
 871       break;
 872     image->scene=i;
 873     AppendImageToList(&images,CloneImageList(image,exception));
 874     if (image_info->number_scenes != 0)
 875       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 876         break;
 877   }
 878   djvu_close_lc(lc);
 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[MaxTextExtent];
 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 ",MaxTextExtent);
 948   (void) ConcatenateMagickString(version,DJVU_LIBDJVU_VER_STRING,MaxTextExtent);
 949 #endif
 950   entry=SetMagickInfo("DJVU");
 951 #if defined(MAGICKCORE_DJVU_DELEGATE)
 952   entry->decoder=(DecodeImageHandler *) ReadDJVUImage;
 953 #endif
 954   entry->raw=MagickTrue;
 955   entry->magick=(IsImageFormatHandler *) IsDJVU;
 956   entry->adjoin=MagickFalse;
 957   entry->thread_support=MagickTrue;
 958   entry->description=AcquireString("Déjà vu");
 959   entry->module=AcquireString("DJVU");
 960   if (*version != '\0')
 961     entry->version=AcquireString(version);
 962   entry->note=AcquireString(DJVUNote);
 963   (void) RegisterMagickInfo(entry);
 964   return(MagickImageCoderSignature);
 965 }
 966 \f
 967 /*
 968 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 969 %                                                                             %
 970 %                                                                             %
 971 %                                                                             %
 972 %   U n r e g i s t e r D J V U I m a g e                                     %
 973 %                                                                             %
 974 %                                                                             %
 975 %                                                                             %
 976 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 977 %
 978 %  UnregisterDJVUImage() removes format registrations made by the
 979 %  DJVU module from the list of supported formats.
 980 %
 981 %  The format of the UnregisterDJVUImage method is:
 982 %
 983 %      UnregisterDJVUImage(void)
 984 %
 985 */
 986 ModuleExport void UnregisterDJVUImage(void)
 987 {
 988   (void) UnregisterMagickInfo("DJVU");
 989 }