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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            PPPP    CCCC  DDDD                               %
   7 %                            P   P  C      D   D                              %
   8 %                            PPPP   C      D   D                              %
   9 %                            P      C      D   D                              %
  10 %                            P       CCCC  DDDD                               %
  11 %                                                                             %
  12 %                                                                             %
  13 %                     Read/Write Photo CD Image Format                        %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2009 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/property.h"
  44 #include "magick/blob.h"
  45 #include "magick/blob-private.h"
  46 #include "magick/cache.h"
  47 #include "magick/client.h"
  48 #include "magick/colorspace.h"
  49 #include "magick/constitute.h"
  50 #include "magick/decorate.h"
  51 #include "magick/exception.h"
  52 #include "magick/exception-private.h"
  53 #include "magick/gem.h"
  54 #include "magick/geometry.h"
  55 #include "magick/image.h"
  56 #include "magick/image-private.h"
  57 #include "magick/list.h"
  58 #include "magick/magick.h"
  59 #include "magick/memory_.h"
  60 #include "magick/monitor.h"
  61 #include "magick/monitor-private.h"
  62 #include "magick/montage.h"
  63 #include "magick/resize.h"
  64 #include "magick/shear.h"
  65 #include "magick/quantum-private.h"
  66 #include "magick/static.h"
  67 #include "magick/string_.h"
  68 #include "magick/module.h"
  69 #include "magick/transform.h"
  70 #include "magick/utility.h"
  71 \f
  72 /*
  73   Forward declarations.
  74 */
  75 static MagickBooleanType
  76   WritePCDImage(const ImageInfo *,Image *);
  77 \f
  78 /*
  79 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  80 %                                                                             %
  81 %                                                                             %
  82 %                                                                             %
  83 %   D e c o d e I m a g e                                                     %
  84 %                                                                             %
  85 %                                                                             %
  86 %                                                                             %
  87 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  88 %
  89 %  DecodeImage recovers the Huffman encoded luminance and chrominance
  90 %  deltas.
  91 %
  92 %  The format of the DecodeImage method is:
  93 %
  94 %      MagickBooleanType DecodeImage(Image *image,unsigned char *luma,
  95 %        unsigned char *chroma1,unsigned char *chroma2)
  96 %
  97 %  A description of each parameter follows:
  98 %
  99 %    o image: the address of a structure of type Image.
 100 %
 101 %    o luma: the address of a character buffer that contains the
 102 %      luminance information.
 103 %
 104 %    o chroma1: the address of a character buffer that contains the
 105 %      chrominance information.
 106 %
 107 %    o chroma2: the address of a character buffer that contains the
 108 %      chrominance information.
 109 %
 110 */
 111 static MagickBooleanType DecodeImage(Image *image,unsigned char *luma,
 112   unsigned char *chroma1,unsigned char *chroma2)
 113 {
 114 #define IsSync  ((sum & 0xffffff00UL) == 0xfffffe00UL)
 115 #define PCDGetBits(n) \
 116 {  \
 117   sum=(sum << n) & 0xffffffff; \
 118   bits-=n; \
 119   while (bits <= 24) \
 120   { \
 121     if (p >= (buffer+0x800)) \
 122       { \
 123         count=ReadBlob(image,0x800,buffer); \
 124         p=buffer; \
 125       } \
 126     sum|=((unsigned int) (*p) << (24-bits)); \
 127     bits+=8; \
 128     p++; \
 129   } \
 130   if (EOFBlob(image) != MagickFalse) \
 131     break; \
 132 }
 133
 134   typedef struct PCDTable
 135   {
 136     unsigned int
 137       length,
 138       sequence;
 139
 140     MagickStatusType
 141       mask;
 142
 143     unsigned char
 144       key;
 145   } PCDTable;
 146
 147   long
 148     quantum;
 149
 150   PCDTable
 151     *pcd_table[3];
 152
 153   register long
 154     i,
 155     j;
 156
 157   register PCDTable
 158     *r;
 159
 160   register unsigned char
 161     *p,
 162     *q;
 163
 164   size_t
 165     length;
 166
 167   ssize_t
 168     count;
 169
 170   unsigned char
 171     *buffer;
 172
 173   unsigned long
 174     bits,
 175     plane,
 176     pcd_length[3],
 177     row,
 178     sum;
 179
 180   /*
 181     Initialize Huffman tables.
 182   */
 183   assert(image != (const Image *) NULL);
 184   assert(image->signature == MagickSignature);
 185   if (image->debug != MagickFalse)
 186     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 187   assert(luma != (unsigned char *) NULL);
 188   assert(chroma1 != (unsigned char *) NULL);
 189   assert(chroma2 != (unsigned char *) NULL);
 190   buffer=(unsigned char *) AcquireQuantumMemory(0x800,sizeof(*buffer));
 191   if (buffer == (unsigned char *) NULL)
 192     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 193       image->filename);
 194   sum=0;
 195   bits=32;
 196   p=buffer+0x800;
 197   for (i=0; i < (image->columns > 1536 ? 3 : 1); i++)
 198   {
 199     PCDGetBits(8);
 200     length=(sum & 0xff)+1;
 201     pcd_table[i]=(PCDTable *) AcquireQuantumMemory(length,
 202       sizeof(*pcd_table[i]));
 203     if (pcd_table[i] == (PCDTable *) NULL)
 204       {
 205         buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 206         ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 207           image->filename);
 208       }
 209     r=pcd_table[i];
 210     for (j=0; j < (long) length; j++)
 211     {
 212       PCDGetBits(8);
 213       r->length=(unsigned int) (sum & 0xff)+1;
 214       if (r->length > 16)
 215         {
 216           buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 217           return(MagickFalse);
 218         }
 219       PCDGetBits(16);
 220       r->sequence=(unsigned int) (sum & 0xffff) << 16;
 221       PCDGetBits(8);
 222       r->key=(unsigned char) (sum & 0xff);
 223       r->mask=(~((1U << (32-r->length))-1));
 224       r++;
 225     }
 226     pcd_length[i]=(unsigned long) length;
 227   }
 228   /*
 229     Search for Sync byte.
 230   */
 231   for (i=0; i < 1; i++)
 232     PCDGetBits(16);
 233   for (i=0; i < 1; i++)
 234     PCDGetBits(16);
 235   while ((sum & 0x00fff000UL) != 0x00fff000UL)
 236     PCDGetBits(8);
 237   while (IsSync == 0)
 238     PCDGetBits(1);
 239   /*
 240     Recover the Huffman encoded luminance and chrominance deltas.
 241   */
 242   count=0;
 243   length=0;
 244   plane=0;
 245   row=0;
 246   q=luma;
 247   for ( ; ; )
 248   {
 249     if (IsSync != 0)
 250       {
 251         /*
 252           Determine plane and row number.
 253         */
 254         PCDGetBits(16);
 255         row=((sum >> 9) & 0x1fff);
 256         if (row == image->rows)
 257           break;
 258         PCDGetBits(8);
 259         plane=sum >> 30;
 260         PCDGetBits(16);
 261         switch (plane)
 262         {
 263           case 0:
 264           {
 265             q=luma+row*image->columns;
 266             count=(ssize_t) image->columns;
 267             break;
 268           }
 269           case 2:
 270           {
 271             q=chroma1+(row >> 1)*image->columns;
 272             count=(ssize_t) (image->columns >> 1);
 273             plane--;
 274             break;
 275           }
 276           case 3:
 277           {
 278             q=chroma2+(row >> 1)*image->columns;
 279             count=(ssize_t) (image->columns >> 1);
 280             plane--;
 281             break;
 282           }
 283           default:
 284           {
 285             ThrowBinaryException(CorruptImageError,"CorruptImage",
 286               image->filename);
 287           }
 288         }
 289         length=pcd_length[plane];
 290         continue;
 291       }
 292     /*
 293       Decode luminance or chrominance deltas.
 294     */
 295     r=pcd_table[plane];
 296     for (i=0; ((i < (long) length) && ((sum & r->mask) != r->sequence)); i++)
 297       r++;
 298     if ((row > image->rows) || (r == (PCDTable *) NULL) ||
 299         ((size_t) (q-luma) > (image->columns*image->rows)))
 300       {
 301         (void) ThrowMagickException(&image->exception,GetMagickModule(),
 302           CorruptImageWarning,"SkipToSyncByte","`%s'",image->filename);
 303         while ((sum & 0x00fff000) != 0x00fff000)
 304           PCDGetBits(8);
 305         while (IsSync == 0)
 306           PCDGetBits(1);
 307         continue;
 308       }
 309     if (r->key < 128)
 310       quantum=(long) (*q)+r->key;
 311     else
 312       quantum=(long) (*q)+r->key-256;
 313     *q=(unsigned char) ((quantum < 0) ? 0 : (quantum > 255) ? 255 : quantum);
 314     q++;
 315     PCDGetBits(r->length);
 316     count--;
 317   }
 318   /*
 319     Relinquish resources.
 320   */
 321   for (i=0; i < (image->columns > 1536 ? 3 : 1); i++)
 322     pcd_table[i]=(PCDTable *) RelinquishMagickMemory(pcd_table[i]);
 323   buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 324   return(MagickTrue);
 325 }
 326 \f
 327 /*
 328 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 329 %                                                                             %
 330 %                                                                             %
 331 %                                                                             %
 332 %   I s P C D                                                                 %
 333 %                                                                             %
 334 %                                                                             %
 335 %                                                                             %
 336 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 337 %
 338 %  IsPCD() returns MagickTrue if the image format type, identified by the
 339 %  magick string, is PCD.
 340 %
 341 %  The format of the IsPCD method is:
 342 %
 343 %      MagickBooleanType IsPCD(const unsigned char *magick,const size_t length)
 344 %
 345 %  A description of each parameter follows:
 346 %
 347 %    o magick: compare image format pattern against these bytes.
 348 %
 349 %    o length: Specifies the length of the magick string.
 350 %
 351 */
 352 static MagickBooleanType IsPCD(const unsigned char *magick,const size_t length)
 353 {
 354   if (length < 2052)
 355     return(MagickFalse);
 356   if (LocaleNCompare((const char *) magick+2048,"PCD_",4) == 0)
 357     return(MagickTrue);
 358   return(MagickFalse);
 359 }
 360 \f
 361 /*
 362 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 363 %                                                                             %
 364 %                                                                             %
 365 %                                                                             %
 366 %   R e a d P C D I m a g e                                                   %
 367 %                                                                             %
 368 %                                                                             %
 369 %                                                                             %
 370 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 371 %
 372 %  ReadPCDImage() reads a Photo CD image file and returns it.  It
 373 %  allocates the memory necessary for the new Image structure and returns a
 374 %  pointer to the new image.  Much of the PCD decoder was derived from
 375 %  the program hpcdtoppm(1) by Hadmut Danisch.
 376 %
 377 %  The format of the ReadPCDImage method is:
 378 %
 379 %      image=ReadPCDImage(image_info)
 380 %
 381 %  A description of each parameter follows:
 382 %
 383 %    o image_info: the image info.
 384 %
 385 %    o exception: return any errors or warnings in this structure.
 386 %
 387 */
 388
 389 static inline size_t MagickMin(const size_t x,const size_t y)
 390 {
 391   if (x < y)
 392     return(x);
 393   return(y);
 394 }
 395
 396 static Image *OverviewImage(const ImageInfo *image_info,Image *image,
 397   ExceptionInfo *exception)
 398 {
 399   Image
 400     *montage_image;
 401
 402   MontageInfo
 403     *montage_info;
 404
 405   register Image
 406     *p;
 407
 408   /*
 409     Create the PCD Overview image.
 410   */
 411   for (p=image; p != (Image *) NULL; p=p->next)
 412   {
 413     (void) DeleteImageProperty(p,"label");
 414     (void) SetImageProperty(p,"label",DefaultTileLabel);
 415   }
 416   montage_info=CloneMontageInfo(image_info,(MontageInfo *) NULL);
 417   (void) CopyMagickString(montage_info->filename,image_info->filename,
 418     MaxTextExtent);
 419   montage_image=MontageImageList(image_info,montage_info,image,exception);
 420   montage_info=DestroyMontageInfo(montage_info);
 421   if (montage_image == (Image *) NULL)
 422     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 423   image=DestroyImage(image);
 424   return(montage_image);
 425 }
 426
 427 static void Upsample(const unsigned long width,const unsigned long height,
 428   const unsigned long scaled_width,unsigned char *pixels)
 429 {
 430   register long
 431     x,
 432     y;
 433
 434   register unsigned char
 435     *p,
 436     *q,
 437     *r;
 438
 439   /*
 440     Create a new image that is a integral size greater than an existing one.
 441   */
 442   assert(pixels != (unsigned char *) NULL);
 443   for (y=0; y < (long) height; y++)
 444   {
 445     p=pixels+(height-1-y)*scaled_width+(width-1);
 446     q=pixels+((height-1-y) << 1)*scaled_width+((width-1) << 1);
 447     *q=(*p);
 448     *(q+1)=(*(p));
 449     for (x=1; x < (long) width; x++)
 450     {
 451       p--;
 452       q-=2;
 453       *q=(*p);
 454       *(q+1)=(unsigned char) ((((unsigned long) *p)+
 455         ((unsigned long) *(p+1))+1) >> 1);
 456     }
 457   }
 458   for (y=0; y < (long) (height-1); y++)
 459   {
 460     p=pixels+((unsigned long) y << 1)*scaled_width;
 461     q=p+scaled_width;
 462     r=q+scaled_width;
 463     for (x=0; x < (long) (width-1); x++)
 464     {
 465       *q=(unsigned char) ((((unsigned long) *p)+((unsigned long) *r)+1) >> 1);
 466       *(q+1)=(unsigned char) ((((unsigned long) *p)+((unsigned long) *(p+2))+
 467         ((unsigned long) *r)+((unsigned long) *(r+2))+2) >> 2);
 468       q+=2;
 469       p+=2;
 470       r+=2;
 471     }
 472     *q++=(unsigned char) ((((unsigned long) *p++)+
 473       ((unsigned long) *r++)+1) >> 1);
 474     *q++=(unsigned char) ((((unsigned long) *p++)+
 475       ((unsigned long) *r++)+1) >> 1);
 476   }
 477   p=pixels+(2*height-2)*scaled_width;
 478   q=pixels+(2*height-1)*scaled_width;
 479   (void) CopyMagickMemory(q,p,(size_t) (2*width));
 480 }
 481
 482 static Image *ReadPCDImage(const ImageInfo *image_info,ExceptionInfo *exception)
 483 {
 484   Image
 485     *image;
 486
 487   long
 488     x;
 489
 490   MagickBooleanType
 491     status;
 492
 493   MagickOffsetType
 494     offset;
 495
 496   MagickSizeType
 497     number_pixels;
 498
 499   register long
 500     i,
 501     y;
 502
 503   register PixelPacket
 504     *q;
 505
 506   register unsigned char
 507     *c1,
 508     *c2,
 509     *yy;
 510
 511   ssize_t
 512     count;
 513
 514   unsigned char
 515     *chroma1,
 516     *chroma2,
 517     *header,
 518     *luma;
 519
 520   unsigned int
 521     overview;
 522
 523   unsigned long
 524     height,
 525     number_images,
 526     rotate,
 527     scene,
 528     width;
 529
 530   /*
 531     Open image file.
 532   */
 533   assert(image_info != (const ImageInfo *) NULL);
 534   assert(image_info->signature == MagickSignature);
 535   if (image_info->debug != MagickFalse)
 536     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 537       image_info->filename);
 538   assert(exception != (ExceptionInfo *) NULL);
 539   assert(exception->signature == MagickSignature);
 540   image=AcquireImage(image_info);
 541   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 542   if (status == MagickFalse)
 543     {
 544       image=DestroyImageList(image);
 545       return((Image *) NULL);
 546     }
 547   /*
 548     Determine if this a PCD file.
 549   */
 550   header=(unsigned char *) AcquireQuantumMemory(0x800,3UL*sizeof(*header));
 551   if (header == (unsigned char *) NULL)
 552     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 553   count=ReadBlob(image,3*0x800,header);
 554   overview=LocaleNCompare((char *) header,"PCD_OPA",7) == 0;
 555   if ((count == 0) ||
 556       ((LocaleNCompare((char *) header+0x800,"PCD",3) != 0) && !overview))
 557     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 558   rotate=header[0x0e02] & 0x03;
 559   number_images=(header[10] << 8) | header[11];
 560   header=(unsigned char *) RelinquishMagickMemory(header);
 561   /*
 562     Determine resolution by scene specification.
 563   */
 564   if ((image->columns == 0) || (image->rows == 0))
 565     scene=3;
 566   else
 567     {
 568       width=192;
 569       height=128;
 570       for (scene=1; scene < 6; scene++)
 571       {
 572         if ((width >= image->columns) && (height >= image->rows))
 573           break;
 574         width<<=1;
 575         height<<=1;
 576       }
 577     }
 578   if (image_info->number_scenes != 0)
 579     scene=(unsigned long) MagickMin(image_info->scene,6);
 580   if (overview)
 581     scene=1;
 582   /*
 583     Initialize image structure.
 584   */
 585   width=192;
 586   height=128;
 587   for (i=1; i < (long) MagickMin(scene,3); i++)
 588   {
 589     width<<=1;
 590     height<<=1;
 591   }
 592   image->columns=width;
 593   image->rows=height;
 594   image->depth=8;
 595   for ( ; i < (long) scene; i++)
 596   {
 597     image->columns<<=1;
 598     image->rows<<=1;
 599   }
 600   /*
 601     Allocate lumand chroma memory.
 602   */
 603   number_pixels=(MagickSizeType) image->columns*image->rows;
 604   if (number_pixels != (size_t) number_pixels)
 605     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 606   chroma1=(unsigned char *) AcquireQuantumMemory(image->columns+1UL,image->rows*
 607     sizeof(*chroma1));
 608   chroma2=(unsigned char *) AcquireQuantumMemory(image->columns+1UL,image->rows*
 609     sizeof(*chroma2));
 610   luma=(unsigned char *) AcquireQuantumMemory(image->columns+1UL,image->rows*
 611     sizeof(*luma));
 612   if ((chroma1 == (unsigned char *) NULL) ||
 613       (chroma2 == (unsigned char *) NULL) || (luma == (unsigned char *) NULL))
 614     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 615   /*
 616     Advance to image data.
 617   */
 618   offset=93;
 619   if (overview)
 620     offset=2;
 621   else
 622     if (scene == 2)
 623       offset=20;
 624     else
 625       if (scene <= 1)
 626         offset=1;
 627   for (i=0; i < (long) (offset*0x800); i++)
 628     (void) ReadBlobByte(image);
 629   if (overview)
 630     {
 631       Image
 632         *overview_image;
 633
 634       MagickProgressMonitor
 635         progress_monitor;
 636
 637       register long
 638         j;
 639
 640       /*
 641         Read thumbnails from overview image.
 642       */
 643       for (j=1; j <= (long) number_images; j++)
 644       {
 645         progress_monitor=SetImageProgressMonitor(image,
 646           (MagickProgressMonitor) NULL,image->client_data);
 647         (void) FormatMagickString(image->filename,MaxTextExtent,
 648           "images/img%04ld.pcd",j);
 649         (void) FormatMagickString(image->magick_filename,MaxTextExtent,
 650           "images/img%04ld.pcd",j);
 651         image->scene=(unsigned long) j;
 652         image->columns=width;
 653         image->rows=height;
 654         image->depth=8;
 655         yy=luma;
 656         c1=chroma1;
 657         c2=chroma2;
 658         for (y=0; y < (long) height; y+=2)
 659         {
 660           count=ReadBlob(image,width,yy);
 661           yy+=image->columns;
 662           count=ReadBlob(image,width,yy);
 663           yy+=image->columns;
 664           count=ReadBlob(image,width >> 1,c1);
 665           c1+=image->columns;
 666           count=ReadBlob(image,width >> 1,c2);
 667           c2+=image->columns;
 668         }
 669         Upsample(image->columns >> 1,image->rows >> 1,image->columns,chroma1);
 670         Upsample(image->columns >> 1,image->rows >> 1,image->columns,chroma2);
 671         /*
 672           Transfer luminance and chrominance channels.
 673         */
 674         yy=luma;
 675         c1=chroma1;
 676         c2=chroma2;
 677         for (y=0; y < (long) image->rows; y++)
 678         {
 679           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 680           if (q == (PixelPacket *) NULL)
 681             break;
 682           for (x=0; x < (long) image->columns; x++)
 683           {
 684             q->red=ScaleCharToQuantum(*yy++);
 685             q->green=ScaleCharToQuantum(*c1++);
 686             q->blue=ScaleCharToQuantum(*c2++);
 687             q++;
 688           }
 689           if (SyncAuthenticPixels(image,exception) == MagickFalse)
 690             break;
 691         }
 692         image->colorspace=YCCColorspace;
 693         if (LocaleCompare(image_info->magick,"PCDS") == 0)
 694           image->colorspace=sRGBColorspace;
 695         if (j < (long) number_images)
 696           {
 697             /*
 698               Allocate next image structure.
 699             */
 700             AcquireNextImage(image_info,image);
 701             if (GetNextImageInList(image) == (Image *) NULL)
 702               {
 703                 image=DestroyImageList(image);
 704                 return((Image *) NULL);
 705               }
 706             image=SyncNextImageInList(image);
 707           }
 708         (void) SetImageProgressMonitor(image,progress_monitor,
 709           image->client_data);
 710         if (image->previous == (Image *) NULL)
 711           {
 712             status=SetImageProgress(image,LoadImageTag,j-1,number_images);
 713             if (status == MagickFalse)
 714               break;
 715           }
 716       }
 717       chroma2=(unsigned char *) RelinquishMagickMemory(chroma2);
 718       chroma1=(unsigned char *) RelinquishMagickMemory(chroma1);
 719       luma=(unsigned char *) RelinquishMagickMemory(luma);
 720       image=GetFirstImageInList(image);
 721       overview_image=OverviewImage(image_info,image,exception);
 722       return(overview_image);
 723     }
 724   /*
 725     Read interleaved image.
 726   */
 727   yy=luma;
 728   c1=chroma1;
 729   c2=chroma2;
 730   for (y=0; y < (long) height; y+=2)
 731   {
 732     count=ReadBlob(image,width,yy);
 733     yy+=image->columns;
 734     count=ReadBlob(image,width,yy);
 735     yy+=image->columns;
 736     count=ReadBlob(image,width >> 1,c1);
 737     c1+=image->columns;
 738     count=ReadBlob(image,width >> 1,c2);
 739     c2+=image->columns;
 740   }
 741   if (scene >= 4)
 742     {
 743       /*
 744         Recover luminance deltas for 1536x1024 image.
 745       */
 746       Upsample(768,512,image->columns,luma);
 747       Upsample(384,256,image->columns,chroma1);
 748       Upsample(384,256,image->columns,chroma2);
 749       image->rows=1024;
 750       for (i=0; i < (4*0x800); i++)
 751         (void) ReadBlobByte(image);
 752       status=DecodeImage(image,luma,chroma1,chroma2);
 753       if ((scene >= 5) && status)
 754         {
 755           /*
 756             Recover luminance deltas for 3072x2048 image.
 757           */
 758           Upsample(1536,1024,image->columns,luma);
 759           Upsample(768,512,image->columns,chroma1);
 760           Upsample(768,512,image->columns,chroma2);
 761           image->rows=2048;
 762           offset=TellBlob(image)/0x800+12;
 763           offset=SeekBlob(image,offset*0x800,SEEK_SET);
 764           status=DecodeImage(image,luma,chroma1,chroma2);
 765           if ((scene >= 6) && (status != MagickFalse))
 766             {
 767               /*
 768                 Recover luminance deltas for 6144x4096 image (vaporware).
 769               */
 770               Upsample(3072,2048,image->columns,luma);
 771               Upsample(1536,1024,image->columns,chroma1);
 772               Upsample(1536,1024,image->columns,chroma2);
 773               image->rows=4096;
 774             }
 775         }
 776     }
 777   Upsample(image->columns >> 1,image->rows >> 1,image->columns,chroma1);
 778   Upsample(image->columns >> 1,image->rows >> 1,image->columns,chroma2);
 779   /*
 780     Transfer luminance and chrominance channels.
 781   */
 782   yy=luma;
 783   c1=chroma1;
 784   c2=chroma2;
 785   for (y=0; y < (long) image->rows; y++)
 786   {
 787     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 788     if (q == (PixelPacket *) NULL)
 789       break;
 790     for (x=0; x < (long) image->columns; x++)
 791     {
 792       q->red=ScaleCharToQuantum(*yy++);
 793       q->green=ScaleCharToQuantum(*c1++);
 794       q->blue=ScaleCharToQuantum(*c2++);
 795       q++;
 796     }
 797     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 798       break;
 799     if (image->previous == (Image *) NULL)
 800       {
 801         status=SetImageProgress(image,LoadImageTag,y,image->rows);
 802         if (status == MagickFalse)
 803           break;
 804       }
 805   }
 806   chroma2=(unsigned char *) RelinquishMagickMemory(chroma2);
 807   chroma1=(unsigned char *) RelinquishMagickMemory(chroma1);
 808   luma=(unsigned char *) RelinquishMagickMemory(luma);
 809   if (EOFBlob(image) != MagickFalse)
 810     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 811       image->filename);
 812   (void) CloseBlob(image);
 813   if (image_info->ping == MagickFalse)
 814     if ((rotate == 1) || (rotate == 3))
 815       {
 816         double
 817           degrees;
 818
 819         Image
 820           *rotate_image;
 821
 822         /*
 823           Rotate image.
 824         */
 825         degrees=rotate == 1 ? -90.0 : 90.0;
 826         rotate_image=RotateImage(image,degrees,exception);
 827         if (rotate_image != (Image *) NULL)
 828           {
 829             image=DestroyImage(image);
 830             image=rotate_image;
 831           }
 832       }
 833   /*
 834     Set CCIR 709 primaries with a D65 white point.
 835   */
 836   image->chromaticity.red_primary.x=0.6400f;
 837   image->chromaticity.red_primary.y=0.3300f;
 838   image->chromaticity.green_primary.x=0.3000f;
 839   image->chromaticity.green_primary.y=0.6000f;
 840   image->chromaticity.blue_primary.x=0.1500f;
 841   image->chromaticity.blue_primary.y=0.0600f;
 842   image->chromaticity.white_point.x=0.3127f;
 843   image->chromaticity.white_point.y=0.3290f;
 844   image->gamma=1.000f/2.200f;
 845   image->colorspace=YCCColorspace;
 846   if (LocaleCompare(image_info->magick,"PCDS") == 0)
 847     image->colorspace=sRGBColorspace;
 848   return(GetFirstImageInList(image));
 849 }
 850 \f
 851 /*
 852 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 853 %                                                                             %
 854 %                                                                             %
 855 %                                                                             %
 856 %   R e g i s t e r P C D I m a g e                                           %
 857 %                                                                             %
 858 %                                                                             %
 859 %                                                                             %
 860 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 861 %
 862 %  RegisterPCDImage() adds attributes for the PCD image format to
 863 %  the list of supported formats.  The attributes include the image format
 864 %  tag, a method to read and/or write the format, whether the format
 865 %  supports the saving of more than one frame to the same file or blob,
 866 %  whether the format supports native in-memory I/O, and a brief
 867 %  description of the format.
 868 %
 869 %  The format of the RegisterPCDImage method is:
 870 %
 871 %      unsigned long RegisterPCDImage(void)
 872 %
 873 */
 874 ModuleExport unsigned long RegisterPCDImage(void)
 875 {
 876   MagickInfo
 877     *entry;
 878
 879   entry=SetMagickInfo("PCD");
 880   entry->decoder=(DecodeImageHandler *) ReadPCDImage;
 881   entry->encoder=(EncodeImageHandler *) WritePCDImage;
 882   entry->magick=(IsImageFormatHandler *) IsPCD;
 883   entry->adjoin=MagickFalse;
 884   entry->description=ConstantString("Photo CD");
 885   entry->module=ConstantString("PCD");
 886   (void) RegisterMagickInfo(entry);
 887   entry=SetMagickInfo("PCDS");
 888   entry->decoder=(DecodeImageHandler *) ReadPCDImage;
 889   entry->encoder=(EncodeImageHandler *) WritePCDImage;
 890   entry->adjoin=MagickFalse;
 891   entry->description=ConstantString("Photo CD");
 892   entry->module=ConstantString("PCD");
 893   (void) RegisterMagickInfo(entry);
 894   return(MagickImageCoderSignature);
 895 }
 896 \f
 897 /*
 898 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 899 %                                                                             %
 900 %                                                                             %
 901 %                                                                             %
 902 %   U n r e g i s t e r P C D I m a g e                                       %
 903 %                                                                             %
 904 %                                                                             %
 905 %                                                                             %
 906 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 907 %
 908 %  UnregisterPCDImage() removes format registrations made by the
 909 %  PCD module from the list of supported formats.
 910 %
 911 %  The format of the UnregisterPCDImage method is:
 912 %
 913 %      UnregisterPCDImage(void)
 914 %
 915 */
 916 ModuleExport void UnregisterPCDImage(void)
 917 {
 918   (void) UnregisterMagickInfo("PCD");
 919   (void) UnregisterMagickInfo("PCDS");
 920 }
 921 \f
 922 /*
 923 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 924 %                                                                             %
 925 %                                                                             %
 926 %                                                                             %
 927 %   W r i t e P C D I m a g e                                                 %
 928 %                                                                             %
 929 %                                                                             %
 930 %                                                                             %
 931 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 932 %
 933 %  WritePCDImage() writes an image in the Photo CD encoded image format.
 934 %
 935 %  The format of the WritePCDImage method is:
 936 %
 937 %      MagickBooleanType WritePCDImage(const ImageInfo *image_info,Image *image)
 938 %
 939 %  A description of each parameter follows.
 940 %
 941 %    o image_info: the image info.
 942 %
 943 %    o image:  The image.
 944 %
 945 */
 946
 947 static MagickBooleanType WritePCDTile(Image *image,const char *page_geometry,
 948   const char *tile_geometry)
 949 {
 950   GeometryInfo
 951     geometry_info;
 952
 953   Image
 954     *downsample_image,
 955     *tile_image;
 956
 957   long
 958     y;
 959
 960   MagickBooleanType
 961     status;
 962
 963   MagickStatusType
 964     flags;
 965
 966   RectangleInfo
 967     geometry;
 968
 969   register const PixelPacket
 970     *p,
 971     *q;
 972
 973   register long
 974     i,
 975     x;
 976
 977   /*
 978     Scale image to tile size.
 979   */
 980   SetGeometry(image,&geometry);
 981   (void) ParseMetaGeometry(page_geometry,&geometry.x,&geometry.y,
 982     &geometry.width,&geometry.height);
 983   if ((geometry.width % 2) != 0)
 984     geometry.width--;
 985   if ((geometry.height % 2) != 0)
 986     geometry.height--;
 987   tile_image=ResizeImage(image,geometry.width,geometry.height,TriangleFilter,
 988     1.0,&image->exception);
 989   if (tile_image == (Image *) NULL)
 990     return(MagickFalse);
 991   flags=ParseGeometry(page_geometry,&geometry_info);
 992   geometry.width=(unsigned long) geometry_info.rho;
 993   geometry.height=(unsigned long) geometry_info.sigma;
 994   if ((flags & SigmaValue) == 0)
 995     geometry.height=geometry.width;
 996   if ((tile_image->columns != geometry.width) ||
 997       (tile_image->rows != geometry.height))
 998     {
 999       Image
1000         *bordered_image;
1001
1002       RectangleInfo
1003         border_info;
1004
1005       /*
1006         Put a border around the image.
1007       */
1008       border_info.width=(geometry.width-tile_image->columns+1) >> 1;
1009       border_info.height=(geometry.height-tile_image->rows+1) >> 1;
1010       bordered_image=BorderImage(tile_image,&border_info,&image->exception);
1011       if (bordered_image == (Image *) NULL)
1012         return(MagickFalse);
1013       tile_image=DestroyImage(tile_image);
1014       tile_image=bordered_image;
1015     }
1016   (void) TransformImage(&tile_image,(char *) NULL,tile_geometry);
1017   if (image->colorspace != RGBColorspace)
1018     (void) TransformImageColorspace(tile_image,YCCColorspace);
1019   downsample_image=ResizeImage(tile_image,tile_image->columns/2,
1020     tile_image->rows/2,TriangleFilter,1.0,&image->exception);
1021   if (downsample_image == (Image *) NULL)
1022     return(MagickFalse);
1023   /*
1024     Write tile to PCD file.
1025   */
1026   for (y=0; y < (long) tile_image->rows; y+=2)
1027   {
1028     p=GetVirtualPixels(tile_image,0,y,tile_image->columns,2,
1029       &tile_image->exception);
1030     if (p == (const PixelPacket *) NULL)
1031       break;
1032     for (x=0; x < (long) (tile_image->columns << 1); x++)
1033     {
1034       (void) WriteBlobByte(image,ScaleQuantumToChar(p->red));
1035       p++;
1036     }
1037     q=GetVirtualPixels(downsample_image,0,y >> 1,downsample_image->columns,
1038       1,&downsample_image->exception);
1039     if (q == (const PixelPacket *) NULL)
1040       break;
1041     for (x=0; x < (long) downsample_image->columns; x++)
1042     {
1043       (void) WriteBlobByte(image,ScaleQuantumToChar(q->green));
1044       q++;
1045     }
1046     q=GetVirtualPixels(downsample_image,0,y >> 1,downsample_image->columns,
1047       1,&downsample_image->exception);
1048     if (q == (const PixelPacket *) NULL)
1049       break;
1050     for (x=0; x < (long) downsample_image->columns; x++)
1051     {
1052       (void) WriteBlobByte(image,ScaleQuantumToChar(q->blue));
1053       q++;
1054     }
1055     status=SetImageProgress(image,SaveImageTag,y,tile_image->rows);
1056     if (status == MagickFalse)
1057       break;
1058   }
1059   for (i=0; i < 0x800; i++)
1060     (void) WriteBlobByte(image,'\0');
1061   downsample_image=DestroyImage(downsample_image);
1062   tile_image=DestroyImage(tile_image);
1063   return(MagickTrue);
1064 }
1065
1066 static MagickBooleanType WritePCDImage(const ImageInfo *image_info,Image *image)
1067 {
1068   Image
1069     *pcd_image;
1070
1071   MagickBooleanType
1072     status;
1073
1074   register long
1075     i;
1076
1077   assert(image_info != (const ImageInfo *) NULL);
1078   assert(image_info->signature == MagickSignature);
1079   assert(image != (Image *) NULL);
1080   assert(image->signature == MagickSignature);
1081   if (image->debug != MagickFalse)
1082     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1083   pcd_image=image;
1084   if (image->columns < image->rows)
1085     {
1086       Image
1087         *rotate_image;
1088
1089       /*
1090         Rotate portrait to landscape.
1091       */
1092       rotate_image=RotateImage(image,90.0,&image->exception);
1093       if (rotate_image == (Image *) NULL)
1094         return(MagickFalse);
1095       pcd_image=rotate_image;
1096     }
1097   /*
1098     Open output image file.
1099   */
1100   status=OpenBlob(image_info,pcd_image,WriteBinaryBlobMode,&image->exception);
1101   if (status == MagickFalse)
1102     return(status);
1103   if (image->colorspace != RGBColorspace)
1104     (void) TransformImageColorspace(pcd_image,RGBColorspace);
1105   /*
1106     Write PCD image header.
1107   */
1108   for (i=0; i < 32; i++)
1109     (void) WriteBlobByte(pcd_image,0xff);
1110   for (i=0; i < 4; i++)
1111     (void) WriteBlobByte(pcd_image,0x0e);
1112   for (i=0; i < 8; i++)
1113     (void) WriteBlobByte(pcd_image,'\0');
1114   for (i=0; i < 4; i++)
1115     (void) WriteBlobByte(pcd_image,0x01);
1116   for (i=0; i < 4; i++)
1117     (void) WriteBlobByte(pcd_image,0x05);
1118   for (i=0; i < 8; i++)
1119     (void) WriteBlobByte(pcd_image,'\0');
1120   for (i=0; i < 4; i++)
1121     (void) WriteBlobByte(pcd_image,0x0A);
1122   for (i=0; i < 36; i++)
1123     (void) WriteBlobByte(pcd_image,'\0');
1124   for (i=0; i < 4; i++)
1125     (void) WriteBlobByte(pcd_image,0x01);
1126   for (i=0; i < 1944; i++)
1127     (void) WriteBlobByte(pcd_image,'\0');
1128   (void) WriteBlob(pcd_image,7,(const unsigned char *) "PCD_IPI");
1129   (void) WriteBlobByte(pcd_image,0x06);
1130   for (i=0; i < 1530; i++)
1131     (void) WriteBlobByte(pcd_image,'\0');
1132   if (image->columns < image->rows)
1133     (void) WriteBlobByte(pcd_image,'\1');
1134   else
1135     (void) WriteBlobByte(pcd_image,'\0');
1136   for (i=0; i < (3*0x800-1539); i++)
1137     (void) WriteBlobByte(pcd_image,'\0');
1138   /*
1139     Write PCD tiles.
1140   */
1141   status=WritePCDTile(pcd_image,"768x512>","192x128");
1142   status=WritePCDTile(pcd_image,"768x512>","384x256");
1143   status=WritePCDTile(pcd_image,"768x512>","768x512");
1144   (void) CloseBlob(pcd_image);
1145   if (pcd_image != image)
1146     pcd_image=DestroyImage(pcd_image);
1147   return(status);
1148 }