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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                        IIIII   CCCC   OOO   N   N                           %
   7 %                          I    C      O   O  NN  N                           %
   8 %                          I    C      O   O  N N N                           %
   9 %                          I    C      O   O  N  NN                           %
  10 %                        IIIII   CCCC   OOO   N   N                           %
  11 %                                                                             %
  12 %                                                                             %
  13 %                   Read Microsoft Windows Icon Format                        %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2018 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    https://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/artifact.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/colormap.h"
  48 #include "MagickCore/colorspace.h"
  49 #include "MagickCore/colorspace-private.h"
  50 #include "MagickCore/exception.h"
  51 #include "MagickCore/exception-private.h"
  52 #include "MagickCore/image.h"
  53 #include "MagickCore/image-private.h"
  54 #include "MagickCore/list.h"
  55 #include "MagickCore/log.h"
  56 #include "MagickCore/magick.h"
  57 #include "MagickCore/memory_.h"
  58 #include "MagickCore/monitor.h"
  59 #include "MagickCore/monitor-private.h"
  60 #include "MagickCore/nt-base-private.h"
  61 #include "MagickCore/option.h"
  62 #include "MagickCore/pixel-accessor.h"
  63 #include "MagickCore/quantize.h"
  64 #include "MagickCore/quantum-private.h"
  65 #include "MagickCore/static.h"
  66 #include "MagickCore/string_.h"
  67 #include "MagickCore/module.h"
  68 \f
  69 /*
  70   Define declarations.
  71 */
  72 #if !defined(MAGICKCORE_WINDOWS_SUPPORT) || defined(__MINGW32__)
  73 #define BI_RGB  0
  74 #define BI_RLE8  1
  75 #define BI_BITFIELDS  3
  76 #endif
  77 #define MaxIcons  1024
  78 \f
  79 /*
  80   Typedef declarations.
  81 */
  82 typedef struct _IconEntry
  83 {
  84   unsigned char
  85     width,
  86     height,
  87     colors,
  88     reserved;
  89
  90   unsigned short int
  91     planes,
  92     bits_per_pixel;
  93
  94   size_t
  95     size,
  96     offset;
  97 } IconEntry;
  98
  99 typedef struct _IconFile
 100 {
 101   short
 102     reserved,
 103     resource_type,
 104     count;
 105
 106   IconEntry
 107     directory[MaxIcons];
 108 } IconFile;
 109
 110 typedef struct _IconInfo
 111 {
 112   size_t
 113     file_size,
 114     ba_offset,
 115     offset_bits,
 116     size;
 117
 118   ssize_t
 119     width,
 120     height;
 121
 122   unsigned short
 123     planes,
 124     bits_per_pixel;
 125
 126   size_t
 127     compression,
 128     image_size,
 129     x_pixels,
 130     y_pixels,
 131     number_colors,
 132     red_mask,
 133     green_mask,
 134     blue_mask,
 135     alpha_mask,
 136     colors_important;
 137
 138   ssize_t
 139     colorspace;
 140 } IconInfo;
 141 \f
 142 /*
 143   Forward declaractions.
 144 */
 145 static Image
 146   *AutoResizeImage(const Image *,const char *,MagickOffsetType *,
 147     ExceptionInfo *);
 148
 149 static MagickBooleanType
 150   WriteICONImage(const ImageInfo *,Image *,ExceptionInfo *);
 151
 152 Image *AutoResizeImage(const Image *image,const char *option,
 153   MagickOffsetType *count,ExceptionInfo *exception)
 154 {
 155   #define MAX_SIZES 16
 156
 157   char
 158     *q;
 159
 160   const char
 161     *p;
 162
 163   Image
 164     *resized,
 165     *images;
 166
 167   register ssize_t
 168     i;
 169
 170   size_t
 171     sizes[MAX_SIZES]={256,192,128,96,64,48,40,32,24,16};
 172
 173   images=NULL;
 174   *count=0;
 175   i=0;
 176   p=option;
 177   while (*p != '\0' && i < MAX_SIZES)
 178   {
 179     size_t
 180       size;
 181
 182     while ((isspace((int) ((unsigned char) *p)) != 0))
 183       p++;
 184
 185     size=(size_t)strtol(p,&q,10);
 186     if ((p == q) || (size < 16) || (size > 256))
 187       return((Image *) NULL);
 188
 189     p=q;
 190     sizes[i++]=size;
 191
 192     while ((isspace((int) ((unsigned char) *p)) != 0) || (*p == ','))
 193       p++;
 194   }
 195
 196   if (i==0)
 197     i=10;
 198   *count=i;
 199   for (i=0; i < *count; i++)
 200   {
 201     resized=ResizeImage(image,sizes[i],sizes[i],image->filter,exception);
 202     if (resized == (Image *) NULL)
 203       return(DestroyImageList(images));
 204
 205     if (images == (Image *) NULL)
 206       images=resized;
 207     else
 208       AppendImageToList(&images,resized);
 209   }
 210   return(images);
 211 }
 212 \f
 213 /*
 214 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 215 %                                                                             %
 216 %                                                                             %
 217 %                                                                             %
 218 %   R e a d I C O N I m a g e                                                 %
 219 %                                                                             %
 220 %                                                                             %
 221 %                                                                             %
 222 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 223 %
 224 %  ReadICONImage() reads a Microsoft icon image file and returns it.  It
 225 %  allocates the memory necessary for the new Image structure and returns a
 226 %  pointer to the new image.
 227 %
 228 %  The format of the ReadICONImage method is:
 229 %
 230 %      Image *ReadICONImage(const ImageInfo *image_info,
 231 %        ExceptionInfo *exception)
 232 %
 233 %  A description of each parameter follows:
 234 %
 235 %    o image_info: the image info.
 236 %
 237 %    o exception: return any errors or warnings in this structure.
 238 %
 239 */
 240 static Image *ReadICONImage(const ImageInfo *image_info,
 241   ExceptionInfo *exception)
 242 {
 243   IconFile
 244     icon_file;
 245
 246   IconInfo
 247     icon_info;
 248
 249   Image
 250     *image;
 251
 252   MagickBooleanType
 253     status;
 254
 255   MagickSizeType
 256     extent;
 257
 258   register ssize_t
 259     i,
 260     x;
 261
 262   register Quantum
 263     *q;
 264
 265   register unsigned char
 266     *p;
 267
 268   size_t
 269     bit,
 270     byte,
 271     bytes_per_line,
 272     one,
 273     scanline_pad;
 274
 275   ssize_t
 276     count,
 277     offset,
 278     y;
 279
 280   /*
 281     Open image file.
 282   */
 283   assert(image_info != (const ImageInfo *) NULL);
 284   assert(image_info->signature == MagickCoreSignature);
 285   (void) LogMagickEvent(CoderEvent,GetMagickModule(),"%s",image_info->filename);
 286   assert(exception != (ExceptionInfo *) NULL);
 287   assert(exception->signature == MagickCoreSignature);
 288   image=AcquireImage(image_info,exception);
 289   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 290   if (status == MagickFalse)
 291     {
 292       image=DestroyImageList(image);
 293       return((Image *) NULL);
 294     }
 295   icon_file.reserved=(short) ReadBlobLSBShort(image);
 296   icon_file.resource_type=(short) ReadBlobLSBShort(image);
 297   icon_file.count=(short) ReadBlobLSBShort(image);
 298   if ((icon_file.reserved != 0) ||
 299       ((icon_file.resource_type != 1) && (icon_file.resource_type != 2)) ||
 300       (icon_file.count > MaxIcons))
 301     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 302   extent=0;
 303   for (i=0; i < icon_file.count; i++)
 304   {
 305     icon_file.directory[i].width=(unsigned char) ReadBlobByte(image);
 306     icon_file.directory[i].height=(unsigned char) ReadBlobByte(image);
 307     icon_file.directory[i].colors=(unsigned char) ReadBlobByte(image);
 308     icon_file.directory[i].reserved=(unsigned char) ReadBlobByte(image);
 309     icon_file.directory[i].planes=(unsigned short) ReadBlobLSBShort(image);
 310     icon_file.directory[i].bits_per_pixel=(unsigned short)
 311       ReadBlobLSBShort(image);
 312     icon_file.directory[i].size=ReadBlobLSBLong(image);
 313     icon_file.directory[i].offset=ReadBlobLSBLong(image);
 314     if (EOFBlob(image) != MagickFalse)
 315       break;
 316     extent=MagickMax(extent,icon_file.directory[i].size);
 317   }
 318   if ((EOFBlob(image) != MagickFalse) || (extent > GetBlobSize(image)))
 319     ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
 320   one=1;
 321   for (i=0; i < icon_file.count; i++)
 322   {
 323     /*
 324       Verify Icon identifier.
 325     */
 326     offset=(ssize_t) SeekBlob(image,(MagickOffsetType)
 327       icon_file.directory[i].offset,SEEK_SET);
 328     if (offset < 0)
 329       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 330     icon_info.size=ReadBlobLSBLong(image);
 331     icon_info.width=(unsigned char) ReadBlobLSBSignedLong(image);
 332     icon_info.height=(unsigned char) (ReadBlobLSBSignedLong(image)/2);
 333     icon_info.planes=ReadBlobLSBShort(image);
 334     icon_info.bits_per_pixel=ReadBlobLSBShort(image);
 335     if (EOFBlob(image) != MagickFalse)
 336       {
 337         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 338           image->filename);
 339         break;
 340       }
 341     if (((icon_info.planes == 18505) && (icon_info.bits_per_pixel == 21060)) ||
 342         (icon_info.size == 0x474e5089))
 343       {
 344         Image
 345           *icon_image;
 346
 347         ImageInfo
 348           *read_info;
 349
 350         size_t
 351           length;
 352
 353         unsigned char
 354           *png;
 355
 356         /*
 357           Icon image encoded as a compressed PNG image.
 358         */
 359         length=icon_file.directory[i].size;
 360         if ((length < 16) || (~length < 16))
 361           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 362         png=(unsigned char *) AcquireQuantumMemory(length+16,sizeof(*png));
 363         if (png == (unsigned char *) NULL)
 364           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 365         (void) memcpy(png,"\211PNG\r\n\032\n\000\000\000\015",12);
 366         png[12]=(unsigned char) icon_info.planes;
 367         png[13]=(unsigned char) (icon_info.planes >> 8);
 368         png[14]=(unsigned char) icon_info.bits_per_pixel;
 369         png[15]=(unsigned char) (icon_info.bits_per_pixel >> 8);
 370         count=ReadBlob(image,length,png+16);
 371         if (count != (ssize_t) length)
 372           {
 373             png=(unsigned char *) RelinquishMagickMemory(png);
 374             ThrowReaderException(CorruptImageError,
 375                 "InsufficientImageDataInFile");
 376           }
 377         read_info=CloneImageInfo(image_info);
 378         (void) CopyMagickString(read_info->magick,"PNG",MagickPathExtent);
 379         icon_image=BlobToImage(read_info,png,length+16,exception);
 380         read_info=DestroyImageInfo(read_info);
 381         png=(unsigned char *) RelinquishMagickMemory(png);
 382         if (icon_image == (Image *) NULL)
 383           return(DestroyImageList(image));
 384         DestroyBlob(icon_image);
 385         icon_image->blob=ReferenceBlob(image->blob);
 386         ReplaceImageInList(&image,icon_image);
 387       }
 388     else
 389       {
 390         if (icon_info.bits_per_pixel > 32)
 391           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 392         icon_info.compression=ReadBlobLSBLong(image);
 393         icon_info.image_size=ReadBlobLSBLong(image);
 394         icon_info.x_pixels=ReadBlobLSBLong(image);
 395         icon_info.y_pixels=ReadBlobLSBLong(image);
 396         icon_info.number_colors=ReadBlobLSBLong(image);
 397         if (icon_info.number_colors > GetBlobSize(image))
 398           ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
 399         icon_info.colors_important=ReadBlobLSBLong(image);
 400         image->alpha_trait=BlendPixelTrait;
 401         image->columns=(size_t) icon_file.directory[i].width;
 402         if ((ssize_t) image->columns > icon_info.width)
 403           image->columns=(size_t) icon_info.width;
 404         if (image->columns == 0)
 405           image->columns=256;
 406         image->rows=(size_t) icon_file.directory[i].height;
 407         if ((ssize_t) image->rows > icon_info.height)
 408           image->rows=(size_t) icon_info.height;
 409         if (image->rows == 0)
 410           image->rows=256;
 411         image->depth=icon_info.bits_per_pixel;
 412         if (image->depth > 16)
 413           image->depth=8;
 414         if (image->debug != MagickFalse)
 415           {
 416             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 417               " scene    = %.20g",(double) i);
 418             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 419               "   size   = %.20g",(double) icon_info.size);
 420             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 421               "   width  = %.20g",(double) icon_file.directory[i].width);
 422             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 423               "   height = %.20g",(double) icon_file.directory[i].height);
 424             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 425               "   colors = %.20g",(double ) icon_info.number_colors);
 426             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 427               "   planes = %.20g",(double) icon_info.planes);
 428             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 429               "   bpp    = %.20g",(double) icon_info.bits_per_pixel);
 430           }
 431       if ((icon_info.number_colors != 0) || (icon_info.bits_per_pixel <= 16U))
 432         {
 433           image->storage_class=PseudoClass;
 434           image->colors=icon_info.number_colors;
 435           if ((image->colors == 0) || (image->colors > 256))
 436             image->colors=one << icon_info.bits_per_pixel;
 437         }
 438       if (image->storage_class == PseudoClass)
 439         {
 440           register ssize_t
 441             j;
 442
 443           unsigned char
 444             *icon_colormap;
 445
 446           /*
 447             Read Icon raster colormap.
 448           */
 449           if (image->colors > GetBlobSize(image))
 450             ThrowReaderException(CorruptImageError,
 451               "InsufficientImageDataInFile");
 452           if (AcquireImageColormap(image,image->colors,exception) ==
 453               MagickFalse)
 454             ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 455           icon_colormap=(unsigned char *) AcquireQuantumMemory((size_t)
 456             image->colors,4UL*sizeof(*icon_colormap));
 457           if (icon_colormap == (unsigned char *) NULL)
 458             ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 459           count=ReadBlob(image,(size_t) (4*image->colors),icon_colormap);
 460           if (count != (ssize_t) (4*image->colors))
 461             {
 462               icon_colormap=(unsigned char *) RelinquishMagickMemory(
 463                 icon_colormap);
 464               ThrowReaderException(CorruptImageError,
 465                 "InsufficientImageDataInFile");
 466             }
 467           p=icon_colormap;
 468           for (j=0; j < (ssize_t) image->colors; j++)
 469           {
 470             image->colormap[j].blue=(Quantum) ScaleCharToQuantum(*p++);
 471             image->colormap[j].green=(Quantum) ScaleCharToQuantum(*p++);
 472             image->colormap[j].red=(Quantum) ScaleCharToQuantum(*p++);
 473             p++;
 474           }
 475           icon_colormap=(unsigned char *) RelinquishMagickMemory(icon_colormap);
 476         }
 477         /*
 478           Convert Icon raster image to pixel packets.
 479         */
 480         if ((image_info->ping != MagickFalse) &&
 481             (image_info->number_scenes != 0))
 482           if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 483             break;
 484         status=SetImageExtent(image,image->columns,image->rows,exception);
 485         if (status == MagickFalse)
 486           return(DestroyImageList(image));
 487         bytes_per_line=(((image->columns*icon_info.bits_per_pixel)+31) &
 488           ~31) >> 3;
 489         (void) bytes_per_line;
 490         scanline_pad=((((image->columns*icon_info.bits_per_pixel)+31) & ~31)-
 491           (image->columns*icon_info.bits_per_pixel)) >> 3;
 492         switch (icon_info.bits_per_pixel)
 493         {
 494           case 1:
 495           {
 496             /*
 497               Convert bitmap scanline.
 498             */
 499             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 500             {
 501               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 502               if (q == (Quantum *) NULL)
 503                 break;
 504               for (x=0; x < (ssize_t) (image->columns-7); x+=8)
 505               {
 506                 byte=(size_t) ReadBlobByte(image);
 507                 for (bit=0; bit < 8; bit++)
 508                 {
 509                   SetPixelIndex(image,((byte & (0x80 >> bit)) != 0 ? 0x01 :
 510                     0x00),q);
 511                   q+=GetPixelChannels(image);
 512                 }
 513               }
 514               if ((image->columns % 8) != 0)
 515                 {
 516                   byte=(size_t) ReadBlobByte(image);
 517                   for (bit=0; bit < (image->columns % 8); bit++)
 518                   {
 519                     SetPixelIndex(image,((byte & (0x80 >> bit)) != 0 ? 0x01 :
 520                       0x00),q);
 521                     q+=GetPixelChannels(image);
 522                   }
 523                 }
 524               for (x=0; x < (ssize_t) scanline_pad; x++)
 525                 (void) ReadBlobByte(image);
 526               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 527                 break;
 528               if (image->previous == (Image *) NULL)
 529                 {
 530                   status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 531                     image->rows);
 532                   if (status == MagickFalse)
 533                     break;
 534                 }
 535             }
 536             break;
 537           }
 538           case 4:
 539           {
 540             /*
 541               Read 4-bit Icon scanline.
 542             */
 543             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 544             {
 545               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 546               if (q == (Quantum *) NULL)
 547                 break;
 548               for (x=0; x < ((ssize_t) image->columns-1); x+=2)
 549               {
 550                 byte=(size_t) ReadBlobByte(image);
 551                 SetPixelIndex(image,((byte >> 4) & 0xf),q);
 552                 q+=GetPixelChannels(image);
 553                 SetPixelIndex(image,((byte) & 0xf),q);
 554                 q+=GetPixelChannels(image);
 555               }
 556               if ((image->columns % 2) != 0)
 557                 {
 558                   byte=(size_t) ReadBlobByte(image);
 559                   SetPixelIndex(image,((byte >> 4) & 0xf),q);
 560                   q+=GetPixelChannels(image);
 561                 }
 562               for (x=0; x < (ssize_t) scanline_pad; x++)
 563                 (void) ReadBlobByte(image);
 564               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 565                 break;
 566               if (image->previous == (Image *) NULL)
 567                 {
 568                   status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 569                     image->rows);
 570                   if (status == MagickFalse)
 571                     break;
 572                 }
 573             }
 574             break;
 575           }
 576           case 8:
 577           {
 578             /*
 579               Convert PseudoColor scanline.
 580             */
 581             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 582             {
 583               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 584               if (q == (Quantum *) NULL)
 585                 break;
 586               for (x=0; x < (ssize_t) image->columns; x++)
 587               {
 588                 byte=(size_t) ReadBlobByte(image);
 589                 SetPixelIndex(image,(Quantum) byte,q);
 590                 q+=GetPixelChannels(image);
 591               }
 592               for (x=0; x < (ssize_t) scanline_pad; x++)
 593                 (void) ReadBlobByte(image);
 594               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 595                 break;
 596               if (image->previous == (Image *) NULL)
 597                 {
 598                   status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 599                     image->rows);
 600                   if (status == MagickFalse)
 601                     break;
 602                 }
 603             }
 604             break;
 605           }
 606           case 16:
 607           {
 608             /*
 609               Convert PseudoColor scanline.
 610             */
 611             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 612             {
 613               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 614               if (q == (Quantum *) NULL)
 615                 break;
 616               for (x=0; x < (ssize_t) image->columns; x++)
 617               {
 618                 byte=(size_t) ReadBlobByte(image);
 619                 byte|=((size_t) ReadBlobByte(image) << 8);
 620                 SetPixelIndex(image,(Quantum) byte,q);
 621                 q+=GetPixelChannels(image);
 622               }
 623               for (x=0; x < (ssize_t) scanline_pad; x++)
 624                 (void) ReadBlobByte(image);
 625               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 626                 break;
 627               if (image->previous == (Image *) NULL)
 628                 {
 629                   status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 630                     image->rows);
 631                   if (status == MagickFalse)
 632                     break;
 633                 }
 634             }
 635             break;
 636           }
 637           case 24:
 638           case 32:
 639           {
 640             /*
 641               Convert DirectColor scanline.
 642             */
 643             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 644             {
 645               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 646               if (q == (Quantum *) NULL)
 647                 break;
 648               for (x=0; x < (ssize_t) image->columns; x++)
 649               {
 650                 SetPixelBlue(image,ScaleCharToQuantum((unsigned char)
 651                   ReadBlobByte(image)),q);
 652                 SetPixelGreen(image,ScaleCharToQuantum((unsigned char)
 653                   ReadBlobByte(image)),q);
 654                 SetPixelRed(image,ScaleCharToQuantum((unsigned char)
 655                   ReadBlobByte(image)),q);
 656                 if (icon_info.bits_per_pixel == 32)
 657                   SetPixelAlpha(image,ScaleCharToQuantum((unsigned char)
 658                     ReadBlobByte(image)),q);
 659                 q+=GetPixelChannels(image);
 660               }
 661               if (icon_info.bits_per_pixel == 24)
 662                 for (x=0; x < (ssize_t) scanline_pad; x++)
 663                   (void) ReadBlobByte(image);
 664               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 665                 break;
 666               if (image->previous == (Image *) NULL)
 667                 {
 668                   status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 669                     image->rows);
 670                   if (status == MagickFalse)
 671                     break;
 672                 }
 673             }
 674             break;
 675           }
 676           default:
 677             ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 678         }
 679         if ((image_info->ping == MagickFalse) &&
 680             (icon_info.bits_per_pixel <= 16))
 681           (void) SyncImage(image,exception);
 682         if (icon_info.bits_per_pixel != 32)
 683           {
 684             /*
 685               Read the ICON alpha mask.
 686             */
 687             image->storage_class=DirectClass;
 688             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 689             {
 690               q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
 691               if (q == (Quantum *) NULL)
 692                 break;
 693               for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 694               {
 695                 byte=(size_t) ReadBlobByte(image);
 696                 for (bit=0; bit < 8; bit++)
 697                 {
 698                   SetPixelAlpha(image,(((byte & (0x80 >> bit)) != 0) ?
 699                     TransparentAlpha : OpaqueAlpha),q);
 700                   q+=GetPixelChannels(image);
 701                 }
 702               }
 703               if ((image->columns % 8) != 0)
 704                 {
 705                   byte=(size_t) ReadBlobByte(image);
 706                   for (bit=0; bit < (image->columns % 8); bit++)
 707                   {
 708                     SetPixelAlpha(image,(((byte & (0x80 >> bit)) != 0) ?
 709                       TransparentAlpha : OpaqueAlpha),q);
 710                     q+=GetPixelChannels(image);
 711                   }
 712                 }
 713               if ((image->columns % 32) != 0)
 714                 for (x=0; x < (ssize_t) ((32-(image->columns % 32))/8); x++)
 715                   (void) ReadBlobByte(image);
 716               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 717                 break;
 718             }
 719           }
 720         if (EOFBlob(image) != MagickFalse)
 721           {
 722             ThrowFileException(exception,CorruptImageError,
 723               "UnexpectedEndOfFile",image->filename);
 724             break;
 725           }
 726       }
 727     /*
 728       Proceed to next image.
 729     */
 730     if (image_info->number_scenes != 0)
 731       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 732         break;
 733     if (i < (ssize_t) (icon_file.count-1))
 734       {
 735         /*
 736           Allocate next image structure.
 737         */
 738         AcquireNextImage(image_info,image,exception);
 739         if (GetNextImageInList(image) == (Image *) NULL)
 740           {
 741             status=MagickFalse;
 742             break;
 743           }
 744         image=SyncNextImageInList(image);
 745         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 746           GetBlobSize(image));
 747         if (status == MagickFalse)
 748           break;
 749       }
 750   }
 751   (void) CloseBlob(image);
 752   if (status == MagickFalse)
 753     return(DestroyImageList(image));
 754   return(GetFirstImageInList(image));
 755 }
 756 \f
 757 /*
 758 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 759 %                                                                             %
 760 %                                                                             %
 761 %                                                                             %
 762 %   R e g i s t e r I C O N I m a g e                                         %
 763 %                                                                             %
 764 %                                                                             %
 765 %                                                                             %
 766 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 767 %
 768 %  RegisterICONImage() adds attributes for the Icon image format to
 769 %  the list of supported formats.  The attributes include the image format
 770 %  tag, a method to read and/or write the format, whether the format
 771 %  supports the saving of more than one frame to the same file or blob,
 772 %  whether the format supports native in-memory I/O, and a brief
 773 %  description of the format.
 774 %
 775 %  The format of the RegisterICONImage method is:
 776 %
 777 %      size_t RegisterICONImage(void)
 778 %
 779 */
 780 ModuleExport size_t RegisterICONImage(void)
 781 {
 782   MagickInfo
 783     *entry;
 784
 785   entry=AcquireMagickInfo("ICON","CUR","Microsoft icon");
 786   entry->decoder=(DecodeImageHandler *) ReadICONImage;
 787   entry->encoder=(EncodeImageHandler *) WriteICONImage;
 788   entry->flags^=CoderAdjoinFlag;
 789   entry->flags|=CoderDecoderSeekableStreamFlag;
 790   entry->flags|=CoderEncoderSeekableStreamFlag;
 791   (void) RegisterMagickInfo(entry);
 792   entry=AcquireMagickInfo("ICON","ICO","Microsoft icon");
 793   entry->decoder=(DecodeImageHandler *) ReadICONImage;
 794   entry->encoder=(EncodeImageHandler *) WriteICONImage;
 795   entry->flags|=CoderDecoderSeekableStreamFlag;
 796   entry->flags|=CoderEncoderSeekableStreamFlag;
 797   (void) RegisterMagickInfo(entry);
 798   entry=AcquireMagickInfo("ICON","ICON","Microsoft icon");
 799   entry->decoder=(DecodeImageHandler *) ReadICONImage;
 800   entry->encoder=(EncodeImageHandler *) WriteICONImage;
 801   entry->flags^=CoderAdjoinFlag;
 802   entry->flags|=CoderDecoderSeekableStreamFlag;
 803   entry->flags|=CoderEncoderSeekableStreamFlag;
 804   (void) RegisterMagickInfo(entry);
 805   return(MagickImageCoderSignature);
 806 }
 807 \f
 808 /*
 809 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 810 %                                                                             %
 811 %                                                                             %
 812 %                                                                             %
 813 %   U n r e g i s t e r I C O N I m a g e                                     %
 814 %                                                                             %
 815 %                                                                             %
 816 %                                                                             %
 817 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 818 %
 819 %  UnregisterICONImage() removes format registrations made by the
 820 %  ICON module from the list of supported formats.
 821 %
 822 %  The format of the UnregisterICONImage method is:
 823 %
 824 %      UnregisterICONImage(void)
 825 %
 826 */
 827 ModuleExport void UnregisterICONImage(void)
 828 {
 829   (void) UnregisterMagickInfo("CUR");
 830   (void) UnregisterMagickInfo("ICO");
 831   (void) UnregisterMagickInfo("ICON");
 832 }
 833 \f
 834 /*
 835 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 836 %                                                                             %
 837 %                                                                             %
 838 %                                                                             %
 839 %   W r i t e I C O N I m a g e                                               %
 840 %                                                                             %
 841 %                                                                             %
 842 %                                                                             %
 843 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 844 %
 845 %  WriteICONImage() writes an image in Microsoft Windows bitmap encoded
 846 %  image format, version 3 for Windows or (if the image has a matte channel)
 847 %  version 4.
 848 %
 849 %  It encodes any subimage as a compressed PNG image ("BI_PNG)", only when its
 850 %  dimensions are 256x256 and image->compression is undefined or is defined as
 851 %  ZipCompression.
 852 %
 853 %  The format of the WriteICONImage method is:
 854 %
 855 %      MagickBooleanType WriteICONImage(const ImageInfo *image_info,
 856 %        Image *image,ExceptionInfo *exception)
 857 %
 858 %  A description of each parameter follows.
 859 %
 860 %    o image_info: the image info.
 861 %
 862 %    o image:  The image.
 863 %
 864 %    o exception: return any errors or warnings in this structure.
 865 %
 866 */
 867 static MagickBooleanType WriteICONImage(const ImageInfo *image_info,
 868   Image *image,ExceptionInfo *exception)
 869 {
 870   const char
 871     *option;
 872
 873   IconFile
 874     icon_file;
 875
 876   IconInfo
 877     icon_info;
 878
 879   Image
 880     *images,
 881     *next;
 882
 883   MagickBooleanType
 884     status;
 885
 886   MagickOffsetType
 887     offset,
 888     scene;
 889
 890   register const Quantum
 891     *p;
 892
 893   register ssize_t
 894     i,
 895     x;
 896
 897   register unsigned char
 898     *q;
 899
 900   size_t
 901     bytes_per_line,
 902     imageListLength,
 903     scanline_pad;
 904
 905   ssize_t
 906     y;
 907
 908   unsigned char
 909     *pixels;
 910
 911   /*
 912     Open output image file.
 913   */
 914   assert(image_info != (const ImageInfo *) NULL);
 915   assert(image_info->signature == MagickCoreSignature);
 916   assert(image != (Image *) NULL);
 917   assert(image->signature == MagickCoreSignature);
 918     (void) LogMagickEvent(CoderEvent,GetMagickModule(),"%s",image->filename);
 919   assert(exception != (ExceptionInfo *) NULL);
 920   assert(exception->signature == MagickCoreSignature);
 921   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 922   if (status == MagickFalse)
 923     return(status);
 924   images=(Image *) NULL;
 925   option=GetImageOption(image_info,"icon:auto-resize");
 926   if (option != (const char *) NULL)
 927     {
 928       images=AutoResizeImage(image,option,&scene,exception);
 929       if (images == (Image *) NULL)
 930         ThrowWriterException(ImageError,"InvalidDimensions");
 931     }
 932   else
 933     {
 934       scene=0;
 935       next=image;
 936       do
 937       {
 938         if ((image->columns > 256L) || (image->rows > 256L))
 939           ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
 940         scene++;
 941         next=SyncNextImageInList(next);
 942       } while ((next != (Image *) NULL) && (image_info->adjoin != MagickFalse));
 943     }
 944   /*
 945     Dump out a ICON header template to be properly initialized later.
 946   */
 947   (void) WriteBlobLSBShort(image,0);
 948   (void) WriteBlobLSBShort(image,1);
 949   (void) WriteBlobLSBShort(image,(unsigned char) scene);
 950   (void) memset(&icon_file,0,sizeof(icon_file));
 951   (void) memset(&icon_info,0,sizeof(icon_info));
 952   scene=0;
 953   next=(images != (Image *) NULL) ? images : image;
 954   do
 955   {
 956     (void) WriteBlobByte(image,icon_file.directory[scene].width);
 957     (void) WriteBlobByte(image,icon_file.directory[scene].height);
 958     (void) WriteBlobByte(image,icon_file.directory[scene].colors);
 959     (void) WriteBlobByte(image,icon_file.directory[scene].reserved);
 960     (void) WriteBlobLSBShort(image,icon_file.directory[scene].planes);
 961     (void) WriteBlobLSBShort(image,icon_file.directory[scene].bits_per_pixel);
 962     (void) WriteBlobLSBLong(image,(unsigned int)
 963       icon_file.directory[scene].size);
 964     (void) WriteBlobLSBLong(image,(unsigned int)
 965       icon_file.directory[scene].offset);
 966     scene++;
 967     next=SyncNextImageInList(next);
 968   } while ((next != (Image *) NULL) && (image_info->adjoin != MagickFalse));
 969   scene=0;
 970   next=(images != (Image *) NULL) ? images : image;
 971   imageListLength=GetImageListLength(image);
 972   do
 973   {
 974     if ((next->columns > 255L) && (next->rows > 255L) &&
 975         ((next->compression == UndefinedCompression) ||
 976         (next->compression == ZipCompression)))
 977       {
 978         Image
 979           *write_image;
 980
 981         ImageInfo
 982           *write_info;
 983
 984         size_t
 985           length;
 986
 987         unsigned char
 988           *png;
 989
 990         write_image=CloneImage(next,0,0,MagickTrue,exception);
 991         if (write_image == (Image *) NULL)
 992           {
 993             images=DestroyImageList(images);
 994             return(MagickFalse);
 995           }
 996         write_info=CloneImageInfo(image_info);
 997         (void) CopyMagickString(write_info->magick,"PNG",MagickPathExtent);
 998         length=0;
 999
1000         /* Don't write any ancillary chunks except for gAMA */
1001         (void) SetImageArtifact(write_image,"png:include-chunk","none,gama");
1002
1003         /* Only write PNG32 formatted PNG (32-bit RGBA), 8 bits per channel */
1004         (void) SetImageArtifact(write_image,"png:format","png32");
1005
1006         png=(unsigned char *) ImageToBlob(write_info,write_image,&length,
1007           exception);
1008         write_image=DestroyImageList(write_image);
1009         write_info=DestroyImageInfo(write_info);
1010         if (png == (unsigned char *) NULL)
1011           {
1012             images=DestroyImageList(images);
1013             return(MagickFalse);
1014           }
1015         icon_file.directory[scene].width=0;
1016         icon_file.directory[scene].height=0;
1017         icon_file.directory[scene].colors=0;
1018         icon_file.directory[scene].reserved=0;
1019         icon_file.directory[scene].planes=1;
1020         icon_file.directory[scene].bits_per_pixel=32;
1021         icon_file.directory[scene].size=(size_t) length;
1022         icon_file.directory[scene].offset=(size_t) TellBlob(image);
1023         (void) WriteBlob(image,(size_t) length,png);
1024         png=(unsigned char *) RelinquishMagickMemory(png);
1025       }
1026     else
1027       {
1028         /*
1029           Initialize ICON raster file header.
1030         */
1031         (void) TransformImageColorspace(next,sRGBColorspace,exception);
1032         icon_info.file_size=14+12+28;
1033         icon_info.offset_bits=icon_info.file_size;
1034         icon_info.compression=BI_RGB;
1035         if ((next->storage_class != DirectClass) && (next->colors > 256))
1036           (void) SetImageStorageClass(next,DirectClass,exception);
1037         if (next->storage_class == DirectClass)
1038           {
1039             /*
1040               Full color ICON raster.
1041             */
1042             icon_info.number_colors=0;
1043             icon_info.bits_per_pixel=32;
1044             icon_info.compression=(size_t) BI_RGB;
1045           }
1046         else
1047           {
1048             size_t
1049               one;
1050
1051             /*
1052               Colormapped ICON raster.
1053             */
1054             icon_info.bits_per_pixel=8;
1055             if (next->colors <= 256)
1056               icon_info.bits_per_pixel=8;
1057             if (next->colors <= 16)
1058               icon_info.bits_per_pixel=4;
1059             if (next->colors <= 2)
1060               icon_info.bits_per_pixel=1;
1061             one=1;
1062             icon_info.number_colors=one << icon_info.bits_per_pixel;
1063             if (icon_info.number_colors < next->colors)
1064               {
1065                 (void) SetImageStorageClass(next,DirectClass,exception);
1066                 icon_info.number_colors=0;
1067                 icon_info.bits_per_pixel=(unsigned short) 24;
1068                 icon_info.compression=(size_t) BI_RGB;
1069               }
1070             else
1071               {
1072                 one=1;
1073                 icon_info.file_size+=3*(one << icon_info.bits_per_pixel);
1074                 icon_info.offset_bits+=3*(one << icon_info.bits_per_pixel);
1075                 icon_info.file_size+=(one << icon_info.bits_per_pixel);
1076                 icon_info.offset_bits+=(one << icon_info.bits_per_pixel);
1077               }
1078           }
1079         bytes_per_line=(((next->columns*icon_info.bits_per_pixel)+31) &
1080           ~31) >> 3;
1081         icon_info.ba_offset=0;
1082         icon_info.width=(ssize_t) next->columns;
1083         icon_info.height=(ssize_t) next->rows;
1084         icon_info.planes=1;
1085         icon_info.image_size=bytes_per_line*next->rows;
1086         icon_info.size=40;
1087         icon_info.size+=(4*icon_info.number_colors);
1088         icon_info.size+=icon_info.image_size;
1089         icon_info.size+=(((icon_info.width+31) & ~31) >> 3)*icon_info.height;
1090         icon_info.file_size+=icon_info.image_size;
1091         icon_info.x_pixels=0;
1092         icon_info.y_pixels=0;
1093         switch (next->units)
1094         {
1095           case UndefinedResolution:
1096           case PixelsPerInchResolution:
1097           {
1098             icon_info.x_pixels=(size_t) (100.0*next->resolution.x/2.54);
1099             icon_info.y_pixels=(size_t) (100.0*next->resolution.y/2.54);
1100             break;
1101           }
1102           case PixelsPerCentimeterResolution:
1103           {
1104             icon_info.x_pixels=(size_t) (100.0*next->resolution.x);
1105             icon_info.y_pixels=(size_t) (100.0*next->resolution.y);
1106             break;
1107           }
1108         }
1109         icon_info.colors_important=icon_info.number_colors;
1110         /*
1111           Convert MIFF to ICON raster pixels.
1112         */
1113         pixels=(unsigned char *) AcquireQuantumMemory((size_t)
1114           icon_info.image_size,sizeof(*pixels));
1115         if (pixels == (unsigned char *) NULL)
1116           {
1117             images=DestroyImageList(images);
1118             ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1119           }
1120         (void) memset(pixels,0,(size_t) icon_info.image_size);
1121         switch (icon_info.bits_per_pixel)
1122         {
1123           case 1:
1124           {
1125             size_t
1126               bit,
1127               byte;
1128
1129             /*
1130               Convert PseudoClass image to a ICON monochrome image.
1131             */
1132             for (y=0; y < (ssize_t) next->rows; y++)
1133             {
1134               p=GetVirtualPixels(next,0,y,next->columns,1,exception);
1135               if (p == (const Quantum *) NULL)
1136                 break;
1137               q=pixels+(next->rows-y-1)*bytes_per_line;
1138               bit=0;
1139               byte=0;
1140               for (x=0; x < (ssize_t) next->columns; x++)
1141               {
1142                 byte<<=1;
1143                 byte|=GetPixelIndex(next,p) != 0 ? 0x01 : 0x00;
1144                 bit++;
1145                 if (bit == 8)
1146                   {
1147                     *q++=(unsigned char) byte;
1148                     bit=0;
1149                     byte=0;
1150                   }
1151                 p+=GetPixelChannels(image);
1152               }
1153               if (bit != 0)
1154                 *q++=(unsigned char) (byte << (8-bit));
1155               if (next->previous == (Image *) NULL)
1156                 {
1157                   status=SetImageProgress(next,SaveImageTag,y,next->rows);
1158                   if (status == MagickFalse)
1159                     break;
1160                 }
1161             }
1162             break;
1163           }
1164           case 4:
1165           {
1166             size_t
1167               nibble,
1168               byte;
1169
1170             /*
1171               Convert PseudoClass image to a ICON monochrome image.
1172             */
1173             for (y=0; y < (ssize_t) next->rows; y++)
1174             {
1175               p=GetVirtualPixels(next,0,y,next->columns,1,exception);
1176               if (p == (const Quantum *) NULL)
1177                 break;
1178               q=pixels+(next->rows-y-1)*bytes_per_line;
1179               nibble=0;
1180               byte=0;
1181               for (x=0; x < (ssize_t) next->columns; x++)
1182               {
1183                 byte<<=4;
1184                 byte|=((size_t) GetPixelIndex(next,p) & 0x0f);
1185                 nibble++;
1186                 if (nibble == 2)
1187                   {
1188                     *q++=(unsigned char) byte;
1189                     nibble=0;
1190                     byte=0;
1191                   }
1192                 p+=GetPixelChannels(image);
1193               }
1194               if (nibble != 0)
1195                 *q++=(unsigned char) (byte << 4);
1196               if (next->previous == (Image *) NULL)
1197                 {
1198                   status=SetImageProgress(next,SaveImageTag,y,next->rows);
1199                   if (status == MagickFalse)
1200                     break;
1201                 }
1202             }
1203             break;
1204           }
1205           case 8:
1206           {
1207             /*
1208               Convert PseudoClass packet to ICON pixel.
1209             */
1210             for (y=0; y < (ssize_t) next->rows; y++)
1211             {
1212               p=GetVirtualPixels(next,0,y,next->columns,1,exception);
1213               if (p == (const Quantum *) NULL)
1214                 break;
1215               q=pixels+(next->rows-y-1)*bytes_per_line;
1216               for (x=0; x < (ssize_t) next->columns; x++)
1217               {
1218                 *q++=(unsigned char) GetPixelIndex(next,p);
1219                 p+=GetPixelChannels(image);
1220               }
1221               if (next->previous == (Image *) NULL)
1222                 {
1223                   status=SetImageProgress(next,SaveImageTag,y,next->rows);
1224                   if (status == MagickFalse)
1225                     break;
1226                 }
1227             }
1228             break;
1229           }
1230           case 24:
1231           case 32:
1232           {
1233             /*
1234               Convert DirectClass packet to ICON BGR888 or BGRA8888 pixel.
1235             */
1236             for (y=0; y < (ssize_t) next->rows; y++)
1237             {
1238               p=GetVirtualPixels(next,0,y,next->columns,1,exception);
1239               if (p == (const Quantum *) NULL)
1240                 break;
1241               q=pixels+(next->rows-y-1)*bytes_per_line;
1242               for (x=0; x < (ssize_t) next->columns; x++)
1243               {
1244                 *q++=ScaleQuantumToChar(GetPixelBlue(next,p));
1245                 *q++=ScaleQuantumToChar(GetPixelGreen(next,p));
1246                 *q++=ScaleQuantumToChar(GetPixelRed(next,p));
1247                 if (next->alpha_trait == UndefinedPixelTrait)
1248                   *q++=ScaleQuantumToChar(QuantumRange);
1249                 else
1250                   *q++=ScaleQuantumToChar(GetPixelAlpha(next,p));
1251                 p+=GetPixelChannels(next);
1252               }
1253               if (icon_info.bits_per_pixel == 24)
1254                 for (x=3L*(ssize_t) next->columns; x < (ssize_t) bytes_per_line; x++)
1255                   *q++=0x00;
1256               if (next->previous == (Image *) NULL)
1257                 {
1258                   status=SetImageProgress(next,SaveImageTag,y,next->rows);
1259                   if (status == MagickFalse)
1260                     break;
1261                 }
1262             }
1263             break;
1264           }
1265         }
1266         /*
1267           Write 40-byte version 3+ bitmap header.
1268         */
1269         icon_file.directory[scene].width=(unsigned char) icon_info.width;
1270         icon_file.directory[scene].height=(unsigned char) icon_info.height;
1271         icon_file.directory[scene].colors=(unsigned char)
1272           icon_info.number_colors;
1273         icon_file.directory[scene].reserved=0;
1274         icon_file.directory[scene].planes=icon_info.planes;
1275         icon_file.directory[scene].bits_per_pixel=icon_info.bits_per_pixel;
1276         icon_file.directory[scene].size=icon_info.size;
1277         icon_file.directory[scene].offset=(size_t) TellBlob(image);
1278         (void) WriteBlobLSBLong(image,(unsigned int) 40);
1279         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.width);
1280         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.height*2);
1281         (void) WriteBlobLSBShort(image,icon_info.planes);
1282         (void) WriteBlobLSBShort(image,icon_info.bits_per_pixel);
1283         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.compression);
1284         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.image_size);
1285         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.x_pixels);
1286         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.y_pixels);
1287         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.number_colors);
1288         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.colors_important);
1289         if (next->storage_class == PseudoClass)
1290           {
1291             unsigned char
1292               *icon_colormap;
1293
1294             /*
1295               Dump colormap to file.
1296             */
1297             icon_colormap=(unsigned char *) AcquireQuantumMemory((size_t)
1298               (1UL << icon_info.bits_per_pixel),4UL*sizeof(*icon_colormap));
1299             if (icon_colormap == (unsigned char *) NULL)
1300               {
1301                 images=DestroyImageList(images);
1302                 ThrowWriterException(ResourceLimitError,
1303                   "MemoryAllocationFailed");
1304               }
1305             q=icon_colormap;
1306             for (i=0; i < (ssize_t) next->colors; i++)
1307             {
1308               *q++=ScaleQuantumToChar(next->colormap[i].blue);
1309               *q++=ScaleQuantumToChar(next->colormap[i].green);
1310               *q++=ScaleQuantumToChar(next->colormap[i].red);
1311               *q++=(unsigned char) 0x0;
1312             }
1313             for ( ; i < (ssize_t) (1UL << icon_info.bits_per_pixel); i++)
1314             {
1315               *q++=(unsigned char) 0x00;
1316               *q++=(unsigned char) 0x00;
1317               *q++=(unsigned char) 0x00;
1318               *q++=(unsigned char) 0x00;
1319             }
1320             (void) WriteBlob(image,(size_t) (4UL*(1UL <<
1321               icon_info.bits_per_pixel)),icon_colormap);
1322             icon_colormap=(unsigned char *) RelinquishMagickMemory(
1323               icon_colormap);
1324           }
1325         (void) WriteBlob(image,(size_t) icon_info.image_size,pixels);
1326         pixels=(unsigned char *) RelinquishMagickMemory(pixels);
1327         /*
1328           Write matte mask.
1329         */
1330         scanline_pad=(((next->columns+31) & ~31)-next->columns) >> 3;
1331         for (y=((ssize_t) next->rows - 1); y >= 0; y--)
1332         {
1333           unsigned char
1334             bit,
1335             byte;
1336
1337           p=GetVirtualPixels(next,0,y,next->columns,1,exception);
1338           if (p == (const Quantum *) NULL)
1339             break;
1340           bit=0;
1341           byte=0;
1342           for (x=0; x < (ssize_t) next->columns; x++)
1343           {
1344             byte<<=1;
1345             if ((next->alpha_trait != UndefinedPixelTrait) &&
1346                 (GetPixelAlpha(next,p) == (Quantum) TransparentAlpha))
1347               byte|=0x01;
1348             bit++;
1349             if (bit == 8)
1350               {
1351                 (void) WriteBlobByte(image,(unsigned char) byte);
1352                 bit=0;
1353                 byte=0;
1354               }
1355             p+=GetPixelChannels(next);
1356           }
1357           if (bit != 0)
1358             (void) WriteBlobByte(image,(unsigned char) (byte << (8-bit)));
1359           for (i=0; i < (ssize_t) scanline_pad; i++)
1360             (void) WriteBlobByte(image,(unsigned char) 0);
1361         }
1362       }
1363     if (GetNextImageInList(next) == (Image *) NULL)
1364       break;
1365     status=SetImageProgress(next,SaveImagesTag,scene++,imageListLength);
1366     if (status == MagickFalse)
1367       break;
1368     next=SyncNextImageInList(next);
1369   } while ((next != (Image *) NULL) && (image_info->adjoin != MagickFalse));
1370   offset=SeekBlob(image,0,SEEK_SET);
1371   (void) offset;
1372   (void) WriteBlobLSBShort(image,0);
1373   (void) WriteBlobLSBShort(image,1);
1374   (void) WriteBlobLSBShort(image,(unsigned short) (scene+1));
1375   scene=0;
1376   next=(images != (Image *) NULL) ? images : image;
1377   do
1378   {
1379     (void) WriteBlobByte(image,icon_file.directory[scene].width);
1380     (void) WriteBlobByte(image,icon_file.directory[scene].height);
1381     (void) WriteBlobByte(image,icon_file.directory[scene].colors);
1382     (void) WriteBlobByte(image,icon_file.directory[scene].reserved);
1383     (void) WriteBlobLSBShort(image,icon_file.directory[scene].planes);
1384     (void) WriteBlobLSBShort(image,icon_file.directory[scene].bits_per_pixel);
1385     (void) WriteBlobLSBLong(image,(unsigned int)
1386       icon_file.directory[scene].size);
1387     (void) WriteBlobLSBLong(image,(unsigned int)
1388       icon_file.directory[scene].offset);
1389     scene++;
1390     next=SyncNextImageInList(next);
1391   } while ((next != (Image *) NULL) && (image_info->adjoin != MagickFalse));
1392   (void) CloseBlob(image);
1393   images=DestroyImageList(images);
1394   return(MagickTrue);
1395 }