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 1999-2016 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/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__) || defined(__MINGW64__)
  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   register ssize_t
 256     i,
 257     x;
 258
 259   register Quantum
 260     *q;
 261
 262   register unsigned char
 263     *p;
 264
 265   size_t
 266     bit,
 267     byte,
 268     bytes_per_line,
 269     one,
 270     scanline_pad;
 271
 272   ssize_t
 273     count,
 274     offset,
 275     y;
 276
 277   /*
 278     Open image file.
 279   */
 280   assert(image_info != (const ImageInfo *) NULL);
 281   assert(image_info->signature == MagickCoreSignature);
 282   (void) LogMagickEvent(CoderEvent,GetMagickModule(),"%s",image_info->filename);
 283   assert(exception != (ExceptionInfo *) NULL);
 284   assert(exception->signature == MagickCoreSignature);
 285   image=AcquireImage(image_info,exception);
 286   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 287   if (status == MagickFalse)
 288     {
 289       image=DestroyImageList(image);
 290       return((Image *) NULL);
 291     }
 292   icon_file.reserved=(short) ReadBlobLSBShort(image);
 293   icon_file.resource_type=(short) ReadBlobLSBShort(image);
 294   icon_file.count=(short) ReadBlobLSBShort(image);
 295   if ((icon_file.reserved != 0) ||
 296       ((icon_file.resource_type != 1) && (icon_file.resource_type != 2)) ||
 297       (icon_file.count > MaxIcons))
 298     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 299   for (i=0; i < icon_file.count; i++)
 300   {
 301     icon_file.directory[i].width=(unsigned char) ReadBlobByte(image);
 302     icon_file.directory[i].height=(unsigned char) ReadBlobByte(image);
 303     icon_file.directory[i].colors=(unsigned char) ReadBlobByte(image);
 304     icon_file.directory[i].reserved=(unsigned char) ReadBlobByte(image);
 305     icon_file.directory[i].planes=(unsigned short) ReadBlobLSBShort(image);
 306     icon_file.directory[i].bits_per_pixel=(unsigned short)
 307       ReadBlobLSBShort(image);
 308     icon_file.directory[i].size=ReadBlobLSBLong(image);
 309     icon_file.directory[i].offset=ReadBlobLSBLong(image);
 310     if (EOFBlob(image) != MagickFalse)
 311       break;
 312   }
 313   if (EOFBlob(image) != MagickFalse)
 314     ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
 315   one=1;
 316   for (i=0; i < icon_file.count; i++)
 317   {
 318     /*
 319       Verify Icon identifier.
 320     */
 321     offset=(ssize_t) SeekBlob(image,(MagickOffsetType)
 322       icon_file.directory[i].offset,SEEK_SET);
 323     if (offset < 0)
 324       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 325     icon_info.size=ReadBlobLSBLong(image);
 326     icon_info.width=(unsigned char) ((int) ReadBlobLSBLong(image));
 327     icon_info.height=(unsigned char) ((int) ReadBlobLSBLong(image)/2);
 328     icon_info.planes=ReadBlobLSBShort(image);
 329     icon_info.bits_per_pixel=ReadBlobLSBShort(image);
 330     if (EOFBlob(image) != MagickFalse)
 331       {
 332         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 333           image->filename);
 334         break;
 335       }
 336     if (((icon_info.planes == 18505) && (icon_info.bits_per_pixel == 21060)) ||
 337         (icon_info.size == 0x474e5089))
 338       {
 339         Image
 340           *icon_image;
 341
 342         ImageInfo
 343           *read_info;
 344
 345         size_t
 346           length;
 347
 348         unsigned char
 349           *png;
 350
 351         /*
 352           Icon image encoded as a compressed PNG image.
 353         */
 354         length=icon_file.directory[i].size;
 355         if (~length < 16)
 356           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 357         png=(unsigned char *) AcquireQuantumMemory(length+16,sizeof(*png));
 358         if (png == (unsigned char *) NULL)
 359           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 360         (void) CopyMagickMemory(png,"\211PNG\r\n\032\n\000\000\000\015",12);
 361         png[12]=(unsigned char) icon_info.planes;
 362         png[13]=(unsigned char) (icon_info.planes >> 8);
 363         png[14]=(unsigned char) icon_info.bits_per_pixel;
 364         png[15]=(unsigned char) (icon_info.bits_per_pixel >> 8);
 365         count=ReadBlob(image,length-16,png+16);
 366         icon_image=(Image *) NULL;
 367         if (count > 0)
 368           {
 369             read_info=CloneImageInfo(image_info);
 370             (void) CopyMagickString(read_info->magick,"PNG",MagickPathExtent);
 371             icon_image=BlobToImage(read_info,png,length+16,exception);
 372             read_info=DestroyImageInfo(read_info);
 373           }
 374         png=(unsigned char *) RelinquishMagickMemory(png);
 375         if (icon_image == (Image *) NULL)
 376           {
 377             if (count != (ssize_t) (length-16))
 378               ThrowReaderException(CorruptImageError,
 379                 "InsufficientImageDataInFile");
 380             image=DestroyImageList(image);
 381             return((Image *) NULL);
 382           }
 383         DestroyBlob(icon_image);
 384         icon_image->blob=ReferenceBlob(image->blob);
 385         ReplaceImageInList(&image,icon_image);
 386       }
 387     else
 388       {
 389         if (icon_info.bits_per_pixel > 32)
 390           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 391         icon_info.compression=ReadBlobLSBLong(image);
 392         icon_info.image_size=ReadBlobLSBLong(image);
 393         icon_info.x_pixels=ReadBlobLSBLong(image);
 394         icon_info.y_pixels=ReadBlobLSBLong(image);
 395         icon_info.number_colors=ReadBlobLSBLong(image);
 396         icon_info.colors_important=ReadBlobLSBLong(image);
 397         image->alpha_trait=BlendPixelTrait;
 398         image->columns=(size_t) icon_file.directory[i].width;
 399         if ((ssize_t) image->columns > icon_info.width)
 400           image->columns=(size_t) icon_info.width;
 401         if (image->columns == 0)
 402           image->columns=256;
 403         image->rows=(size_t) icon_file.directory[i].height;
 404         if ((ssize_t) image->rows > icon_info.height)
 405           image->rows=(size_t) icon_info.height;
 406         if (image->rows == 0)
 407           image->rows=256;
 408         image->depth=icon_info.bits_per_pixel;
 409         if (image->debug != MagickFalse)
 410           {
 411             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 412               " scene    = %.20g",(double) i);
 413             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 414               "   size   = %.20g",(double) icon_info.size);
 415             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 416               "   width  = %.20g",(double) icon_file.directory[i].width);
 417             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 418               "   height = %.20g",(double) icon_file.directory[i].height);
 419             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 420               "   colors = %.20g",(double ) icon_info.number_colors);
 421             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 422               "   planes = %.20g",(double) icon_info.planes);
 423             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 424               "   bpp    = %.20g",(double) icon_info.bits_per_pixel);
 425           }
 426       if ((icon_info.number_colors != 0) || (icon_info.bits_per_pixel <= 16U))
 427         {
 428           image->storage_class=PseudoClass;
 429           image->colors=icon_info.number_colors;
 430           if (image->colors == 0)
 431             image->colors=one << icon_info.bits_per_pixel;
 432         }
 433       if (image->storage_class == PseudoClass)
 434         {
 435           register ssize_t
 436             i;
 437
 438           unsigned char
 439             *icon_colormap;
 440
 441           /*
 442             Read Icon raster colormap.
 443           */
 444           if (AcquireImageColormap(image,image->colors,exception) ==
 445               MagickFalse)
 446             ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 447           icon_colormap=(unsigned char *) AcquireQuantumMemory((size_t)
 448             image->colors,4UL*sizeof(*icon_colormap));
 449           if (icon_colormap == (unsigned char *) NULL)
 450             ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 451           count=ReadBlob(image,(size_t) (4*image->colors),icon_colormap);
 452           if (count != (ssize_t) (4*image->colors))
 453             ThrowReaderException(CorruptImageError,
 454               "InsufficientImageDataInFile");
 455           p=icon_colormap;
 456           for (i=0; i < (ssize_t) image->colors; i++)
 457           {
 458             image->colormap[i].blue=(Quantum) ScaleCharToQuantum(*p++);
 459             image->colormap[i].green=(Quantum) ScaleCharToQuantum(*p++);
 460             image->colormap[i].red=(Quantum) ScaleCharToQuantum(*p++);
 461             p++;
 462           }
 463           icon_colormap=(unsigned char *) RelinquishMagickMemory(icon_colormap);
 464         }
 465         /*
 466           Convert Icon raster image to pixel packets.
 467         */
 468         if ((image_info->ping != MagickFalse) &&
 469             (image_info->number_scenes != 0))
 470           if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 471             break;
 472         status=SetImageExtent(image,image->columns,image->rows,exception);
 473         if (status == MagickFalse)
 474           return(DestroyImageList(image));
 475         bytes_per_line=(((image->columns*icon_info.bits_per_pixel)+31) &
 476           ~31) >> 3;
 477         (void) bytes_per_line;
 478         scanline_pad=((((image->columns*icon_info.bits_per_pixel)+31) & ~31)-
 479           (image->columns*icon_info.bits_per_pixel)) >> 3;
 480         switch (icon_info.bits_per_pixel)
 481         {
 482           case 1:
 483           {
 484             /*
 485               Convert bitmap scanline.
 486             */
 487             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 488             {
 489               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 490               if (q == (Quantum *) NULL)
 491                 break;
 492               for (x=0; x < (ssize_t) (image->columns-7); x+=8)
 493               {
 494                 byte=(size_t) ReadBlobByte(image);
 495                 for (bit=0; bit < 8; bit++)
 496                 {
 497                   SetPixelIndex(image,((byte & (0x80 >> bit)) != 0 ? 0x01 :
 498                     0x00),q);
 499                   q+=GetPixelChannels(image);
 500                 }
 501               }
 502               if ((image->columns % 8) != 0)
 503                 {
 504                   byte=(size_t) ReadBlobByte(image);
 505                   for (bit=0; bit < (image->columns % 8); bit++)
 506                   {
 507                     SetPixelIndex(image,((byte & (0x80 >> bit)) != 0 ? 0x01 :
 508                       0x00),q);
 509                     q+=GetPixelChannels(image);
 510                   }
 511                 }
 512               for (x=0; x < (ssize_t) scanline_pad; x++)
 513                 (void) ReadBlobByte(image);
 514               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 515                 break;
 516               if (image->previous == (Image *) NULL)
 517                 {
 518                   status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 519                     image->rows);
 520                   if (status == MagickFalse)
 521                     break;
 522                 }
 523             }
 524             break;
 525           }
 526           case 4:
 527           {
 528             /*
 529               Read 4-bit Icon scanline.
 530             */
 531             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 532             {
 533               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 534               if (q == (Quantum *) NULL)
 535                 break;
 536               for (x=0; x < ((ssize_t) image->columns-1); x+=2)
 537               {
 538                 byte=(size_t) ReadBlobByte(image);
 539                 SetPixelIndex(image,((byte >> 4) & 0xf),q);
 540                 q+=GetPixelChannels(image);
 541                 SetPixelIndex(image,((byte) & 0xf),q);
 542                 q+=GetPixelChannels(image);
 543               }
 544               if ((image->columns % 2) != 0)
 545                 {
 546                   byte=(size_t) ReadBlobByte(image);
 547                   SetPixelIndex(image,((byte >> 4) & 0xf),q);
 548                   q+=GetPixelChannels(image);
 549                 }
 550               for (x=0; x < (ssize_t) scanline_pad; x++)
 551                 (void) ReadBlobByte(image);
 552               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 553                 break;
 554               if (image->previous == (Image *) NULL)
 555                 {
 556                   status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 557                     image->rows);
 558                   if (status == MagickFalse)
 559                     break;
 560                 }
 561             }
 562             break;
 563           }
 564           case 8:
 565           {
 566             /*
 567               Convert PseudoColor scanline.
 568             */
 569             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 570             {
 571               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 572               if (q == (Quantum *) NULL)
 573                 break;
 574               for (x=0; x < (ssize_t) image->columns; x++)
 575               {
 576                 byte=(size_t) ReadBlobByte(image);
 577                 SetPixelIndex(image,(Quantum) byte,q);
 578                 q+=GetPixelChannels(image);
 579               }
 580               for (x=0; x < (ssize_t) scanline_pad; x++)
 581                 (void) ReadBlobByte(image);
 582               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 583                 break;
 584               if (image->previous == (Image *) NULL)
 585                 {
 586                   status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 587                     image->rows);
 588                   if (status == MagickFalse)
 589                     break;
 590                 }
 591             }
 592             break;
 593           }
 594           case 16:
 595           {
 596             /*
 597               Convert PseudoColor scanline.
 598             */
 599             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 600             {
 601               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 602               if (q == (Quantum *) NULL)
 603                 break;
 604               for (x=0; x < (ssize_t) image->columns; x++)
 605               {
 606                 byte=(size_t) ReadBlobByte(image);
 607                 byte|=(size_t) (ReadBlobByte(image) << 8);
 608                 SetPixelIndex(image,(Quantum) byte,q);
 609                 q+=GetPixelChannels(image);
 610               }
 611               for (x=0; x < (ssize_t) scanline_pad; x++)
 612                 (void) ReadBlobByte(image);
 613               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 614                 break;
 615               if (image->previous == (Image *) NULL)
 616                 {
 617                   status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 618                     image->rows);
 619                   if (status == MagickFalse)
 620                     break;
 621                 }
 622             }
 623             break;
 624           }
 625           case 24:
 626           case 32:
 627           {
 628             /*
 629               Convert DirectColor scanline.
 630             */
 631             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 632             {
 633               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 634               if (q == (Quantum *) NULL)
 635                 break;
 636               for (x=0; x < (ssize_t) image->columns; x++)
 637               {
 638                 SetPixelBlue(image,ScaleCharToQuantum((unsigned char)
 639                   ReadBlobByte(image)),q);
 640                 SetPixelGreen(image,ScaleCharToQuantum((unsigned char)
 641                   ReadBlobByte(image)),q);
 642                 SetPixelRed(image,ScaleCharToQuantum((unsigned char)
 643                   ReadBlobByte(image)),q);
 644                 if (icon_info.bits_per_pixel == 32)
 645                   SetPixelAlpha(image,ScaleCharToQuantum((unsigned char)
 646                     ReadBlobByte(image)),q);
 647                 q+=GetPixelChannels(image);
 648               }
 649               if (icon_info.bits_per_pixel == 24)
 650                 for (x=0; x < (ssize_t) scanline_pad; x++)
 651                   (void) ReadBlobByte(image);
 652               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 653                 break;
 654               if (image->previous == (Image *) NULL)
 655                 {
 656                   status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 657                     image->rows);
 658                   if (status == MagickFalse)
 659                     break;
 660                 }
 661             }
 662             break;
 663           }
 664           default:
 665             ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 666         }
 667         if (image_info->ping == MagickFalse)
 668           (void) SyncImage(image,exception);
 669         if (icon_info.bits_per_pixel != 32)
 670           {
 671             /*
 672               Read the ICON alpha mask.
 673             */
 674             image->storage_class=DirectClass;
 675             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 676             {
 677               q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
 678               if (q == (Quantum *) NULL)
 679                 break;
 680               for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 681               {
 682                 byte=(size_t) ReadBlobByte(image);
 683                 for (bit=0; bit < 8; bit++)
 684                 {
 685                   SetPixelAlpha(image,(((byte & (0x80 >> bit)) != 0) ?
 686                     TransparentAlpha : OpaqueAlpha),q);
 687                   q+=GetPixelChannels(image);
 688                 }
 689               }
 690               if ((image->columns % 8) != 0)
 691                 {
 692                   byte=(size_t) ReadBlobByte(image);
 693                   for (bit=0; bit < (image->columns % 8); bit++)
 694                   {
 695                     SetPixelAlpha(image,(((byte & (0x80 >> bit)) != 0) ?
 696                       TransparentAlpha : OpaqueAlpha),q);
 697                     q+=GetPixelChannels(image);
 698                   }
 699                 }
 700               if ((image->columns % 32) != 0)
 701                 for (x=0; x < (ssize_t) ((32-(image->columns % 32))/8); x++)
 702                   (void) ReadBlobByte(image);
 703               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 704                 break;
 705             }
 706           }
 707         if (EOFBlob(image) != MagickFalse)
 708           {
 709             ThrowFileException(exception,CorruptImageError,
 710               "UnexpectedEndOfFile",image->filename);
 711             break;
 712           }
 713       }
 714     /*
 715       Proceed to next image.
 716     */
 717     if (image_info->number_scenes != 0)
 718       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 719         break;
 720     if (i < (ssize_t) (icon_file.count-1))
 721       {
 722         /*
 723           Allocate next image structure.
 724         */
 725         AcquireNextImage(image_info,image,exception);
 726         if (GetNextImageInList(image) == (Image *) NULL)
 727           {
 728             image=DestroyImageList(image);
 729             return((Image *) NULL);
 730           }
 731         image=SyncNextImageInList(image);
 732         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 733           GetBlobSize(image));
 734         if (status == MagickFalse)
 735           break;
 736       }
 737   }
 738   (void) CloseBlob(image);
 739   return(GetFirstImageInList(image));
 740 }
 741 \f
 742 /*
 743 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 744 %                                                                             %
 745 %                                                                             %
 746 %                                                                             %
 747 %   R e g i s t e r I C O N I m a g e                                         %
 748 %                                                                             %
 749 %                                                                             %
 750 %                                                                             %
 751 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 752 %
 753 %  RegisterICONImage() adds attributes for the Icon image format to
 754 %  the list of supported formats.  The attributes include the image format
 755 %  tag, a method to read and/or write the format, whether the format
 756 %  supports the saving of more than one frame to the same file or blob,
 757 %  whether the format supports native in-memory I/O, and a brief
 758 %  description of the format.
 759 %
 760 %  The format of the RegisterICONImage method is:
 761 %
 762 %      size_t RegisterICONImage(void)
 763 %
 764 */
 765 ModuleExport size_t RegisterICONImage(void)
 766 {
 767   MagickInfo
 768     *entry;
 769
 770   entry=AcquireMagickInfo("ICON","CUR","Microsoft icon");
 771   entry->decoder=(DecodeImageHandler *) ReadICONImage;
 772   entry->encoder=(EncodeImageHandler *) WriteICONImage;
 773   entry->flags^=CoderAdjoinFlag;
 774   entry->flags|=CoderSeekableStreamFlag;
 775   (void) RegisterMagickInfo(entry);
 776   entry=AcquireMagickInfo("ICON","ICO","Microsoft icon");
 777   entry->decoder=(DecodeImageHandler *) ReadICONImage;
 778   entry->encoder=(EncodeImageHandler *) WriteICONImage;
 779   entry->flags|=CoderSeekableStreamFlag;
 780   (void) RegisterMagickInfo(entry);
 781   entry=AcquireMagickInfo("ICON","ICON","Microsoft icon");
 782   entry->decoder=(DecodeImageHandler *) ReadICONImage;
 783   entry->encoder=(EncodeImageHandler *) WriteICONImage;
 784   entry->flags^=CoderAdjoinFlag;
 785   entry->flags|=CoderSeekableStreamFlag;
 786   (void) RegisterMagickInfo(entry);
 787   return(MagickImageCoderSignature);
 788 }
 789 \f
 790 /*
 791 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 792 %                                                                             %
 793 %                                                                             %
 794 %                                                                             %
 795 %   U n r e g i s t e r I C O N I m a g e                                     %
 796 %                                                                             %
 797 %                                                                             %
 798 %                                                                             %
 799 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 800 %
 801 %  UnregisterICONImage() removes format registrations made by the
 802 %  ICON module from the list of supported formats.
 803 %
 804 %  The format of the UnregisterICONImage method is:
 805 %
 806 %      UnregisterICONImage(void)
 807 %
 808 */
 809 ModuleExport void UnregisterICONImage(void)
 810 {
 811   (void) UnregisterMagickInfo("CUR");
 812   (void) UnregisterMagickInfo("ICO");
 813   (void) UnregisterMagickInfo("ICON");
 814 }
 815 \f
 816 /*
 817 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 818 %                                                                             %
 819 %                                                                             %
 820 %                                                                             %
 821 %   W r i t e I C O N I m a g e                                               %
 822 %                                                                             %
 823 %                                                                             %
 824 %                                                                             %
 825 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 826 %
 827 %  WriteICONImage() writes an image in Microsoft Windows bitmap encoded
 828 %  image format, version 3 for Windows or (if the image has a matte channel)
 829 %  version 4.
 830 %
 831 %  It encodes any subimage as a compressed PNG image ("BI_PNG)", only when its
 832 %  dimensions are 256x256 and image->compression is undefined or is defined as
 833 %  ZipCompression.
 834 %
 835 %  The format of the WriteICONImage method is:
 836 %
 837 %      MagickBooleanType WriteICONImage(const ImageInfo *image_info,
 838 %        Image *image,ExceptionInfo *exception)
 839 %
 840 %  A description of each parameter follows.
 841 %
 842 %    o image_info: the image info.
 843 %
 844 %    o image:  The image.
 845 %
 846 %    o exception: return any errors or warnings in this structure.
 847 %
 848 */
 849 static MagickBooleanType WriteICONImage(const ImageInfo *image_info,
 850   Image *image,ExceptionInfo *exception)
 851 {
 852   const char
 853     *option;
 854
 855   IconFile
 856     icon_file;
 857
 858   IconInfo
 859     icon_info;
 860
 861   Image
 862     *images,
 863     *next;
 864
 865   MagickBooleanType
 866     status;
 867
 868   MagickOffsetType
 869     offset,
 870     scene;
 871
 872   register const Quantum
 873     *p;
 874
 875   register ssize_t
 876     i,
 877     x;
 878
 879   register unsigned char
 880     *q;
 881
 882   size_t
 883     bytes_per_line,
 884     scanline_pad;
 885
 886   ssize_t
 887     y;
 888
 889   unsigned char
 890     bit,
 891     byte,
 892     *pixels;
 893
 894   /*
 895     Open output image file.
 896   */
 897   assert(image_info != (const ImageInfo *) NULL);
 898   assert(image_info->signature == MagickCoreSignature);
 899   assert(image != (Image *) NULL);
 900   assert(image->signature == MagickCoreSignature);
 901     (void) LogMagickEvent(CoderEvent,GetMagickModule(),"%s",image->filename);
 902   assert(exception != (ExceptionInfo *) NULL);
 903   assert(exception->signature == MagickCoreSignature);
 904   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 905   if (status == MagickFalse)
 906     return(status);
 907   images=(Image *) NULL;
 908   option=GetImageOption(image_info,"icon:auto-resize");
 909   if (option != (const char *) NULL)
 910     {
 911       images=AutoResizeImage(image,option,&scene,exception);
 912       if (images == (Image *) NULL)
 913         ThrowWriterException(ImageError,"InvalidDimensions");
 914     }
 915   else
 916     {
 917       scene=0;
 918       next=image;
 919       do
 920       {
 921         if ((image->columns > 256L) || (image->rows > 256L))
 922           ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
 923         scene++;
 924         next=SyncNextImageInList(next);
 925       } while ((next != (Image *) NULL) && (image_info->adjoin != MagickFalse));
 926     }
 927   /*
 928     Dump out a ICON header template to be properly initialized later.
 929   */
 930   (void) WriteBlobLSBShort(image,0);
 931   (void) WriteBlobLSBShort(image,1);
 932   (void) WriteBlobLSBShort(image,(unsigned char) scene);
 933   (void) ResetMagickMemory(&icon_file,0,sizeof(icon_file));
 934   (void) ResetMagickMemory(&icon_info,0,sizeof(icon_info));
 935   scene=0;
 936   next=(images != (Image *) NULL) ? images : image;
 937   do
 938   {
 939     (void) WriteBlobByte(image,icon_file.directory[scene].width);
 940     (void) WriteBlobByte(image,icon_file.directory[scene].height);
 941     (void) WriteBlobByte(image,icon_file.directory[scene].colors);
 942     (void) WriteBlobByte(image,icon_file.directory[scene].reserved);
 943     (void) WriteBlobLSBShort(image,icon_file.directory[scene].planes);
 944     (void) WriteBlobLSBShort(image,icon_file.directory[scene].bits_per_pixel);
 945     (void) WriteBlobLSBLong(image,(unsigned int)
 946       icon_file.directory[scene].size);
 947     (void) WriteBlobLSBLong(image,(unsigned int)
 948       icon_file.directory[scene].offset);
 949     scene++;
 950     next=SyncNextImageInList(next);
 951   } while ((next != (Image *) NULL) && (image_info->adjoin != MagickFalse));
 952   scene=0;
 953   next=(images != (Image *) NULL) ? images : image;
 954   do
 955   {
 956     if ((next->columns > 255L) && (next->rows > 255L) &&
 957         ((next->compression == UndefinedCompression) ||
 958         (next->compression == ZipCompression)))
 959       {
 960         Image
 961           *write_image;
 962
 963         ImageInfo
 964           *write_info;
 965
 966         size_t
 967           length;
 968
 969         unsigned char
 970           *png;
 971
 972         write_image=CloneImage(next,0,0,MagickTrue,exception);
 973         if (write_image == (Image *) NULL)
 974           {
 975             images=DestroyImageList(images);
 976             return(MagickFalse);
 977           }
 978         write_info=CloneImageInfo(image_info);
 979         (void) CopyMagickString(write_info->filename,"PNG:",MagickPathExtent);
 980
 981         /* Don't write any ancillary chunks except for gAMA */
 982         (void) SetImageArtifact(write_image,"png:include-chunk","none,gama");
 983
 984         /* Only write PNG32 formatted PNG (32-bit RGBA), 8 bits per channel */
 985         (void) SetImageArtifact(write_image,"png:format","png32");
 986
 987         png=(unsigned char *) ImageToBlob(write_info,write_image,&length,
 988           exception);
 989         write_image=DestroyImageList(write_image);
 990         write_info=DestroyImageInfo(write_info);
 991         if (png == (unsigned char *) NULL)
 992           {
 993             images=DestroyImageList(images);
 994             return(MagickFalse);
 995           }
 996         icon_file.directory[scene].width=0;
 997         icon_file.directory[scene].height=0;
 998         icon_file.directory[scene].colors=0;
 999         icon_file.directory[scene].reserved=0;
1000         icon_file.directory[scene].planes=1;
1001         icon_file.directory[scene].bits_per_pixel=32;
1002         icon_file.directory[scene].size=(size_t) length;
1003         icon_file.directory[scene].offset=(size_t) TellBlob(image);
1004         (void) WriteBlob(image,(size_t) length,png);
1005         png=(unsigned char *) RelinquishMagickMemory(png);
1006       }
1007     else
1008       {
1009         /*
1010           Initialize ICON raster file header.
1011         */
1012         (void) TransformImageColorspace(next,sRGBColorspace,exception);
1013         icon_info.file_size=14+12+28;
1014         icon_info.offset_bits=icon_info.file_size;
1015         icon_info.compression=BI_RGB;
1016         if ((next->storage_class != DirectClass) && (next->colors > 256))
1017           (void) SetImageStorageClass(next,DirectClass,exception);
1018         if (next->storage_class == DirectClass)
1019           {
1020             /*
1021               Full color ICON raster.
1022             */
1023             icon_info.number_colors=0;
1024             icon_info.bits_per_pixel=32;
1025             icon_info.compression=(size_t) BI_RGB;
1026           }
1027         else
1028           {
1029             size_t
1030               one;
1031
1032             /*
1033               Colormapped ICON raster.
1034             */
1035             icon_info.bits_per_pixel=8;
1036             if (next->colors <= 256)
1037               icon_info.bits_per_pixel=8;
1038             if (next->colors <= 16)
1039               icon_info.bits_per_pixel=4;
1040             if (next->colors <= 2)
1041               icon_info.bits_per_pixel=1;
1042             one=1;
1043             icon_info.number_colors=one << icon_info.bits_per_pixel;
1044             if (icon_info.number_colors < next->colors)
1045               {
1046                 (void) SetImageStorageClass(next,DirectClass,exception);
1047                 icon_info.number_colors=0;
1048                 icon_info.bits_per_pixel=(unsigned short) 24;
1049                 icon_info.compression=(size_t) BI_RGB;
1050               }
1051             else
1052               {
1053                 size_t
1054                   one;
1055
1056                 one=1;
1057                 icon_info.file_size+=3*(one << icon_info.bits_per_pixel);
1058                 icon_info.offset_bits+=3*(one << icon_info.bits_per_pixel);
1059                 icon_info.file_size+=(one << icon_info.bits_per_pixel);
1060                 icon_info.offset_bits+=(one << icon_info.bits_per_pixel);
1061               }
1062           }
1063         bytes_per_line=(((next->columns*icon_info.bits_per_pixel)+31) &
1064           ~31) >> 3;
1065         icon_info.ba_offset=0;
1066         icon_info.width=(ssize_t) next->columns;
1067         icon_info.height=(ssize_t) next->rows;
1068         icon_info.planes=1;
1069         icon_info.image_size=bytes_per_line*next->rows;
1070         icon_info.size=40;
1071         icon_info.size+=(4*icon_info.number_colors);
1072         icon_info.size+=icon_info.image_size;
1073         icon_info.size+=(((icon_info.width+31) & ~31) >> 3)*icon_info.height;
1074         icon_info.file_size+=icon_info.image_size;
1075         icon_info.x_pixels=0;
1076         icon_info.y_pixels=0;
1077         switch (next->units)
1078         {
1079           case UndefinedResolution:
1080           case PixelsPerInchResolution:
1081           {
1082             icon_info.x_pixels=(size_t) (100.0*next->resolution.x/2.54);
1083             icon_info.y_pixels=(size_t) (100.0*next->resolution.y/2.54);
1084             break;
1085           }
1086           case PixelsPerCentimeterResolution:
1087           {
1088             icon_info.x_pixels=(size_t) (100.0*next->resolution.x);
1089             icon_info.y_pixels=(size_t) (100.0*next->resolution.y);
1090             break;
1091           }
1092         }
1093         icon_info.colors_important=icon_info.number_colors;
1094         /*
1095           Convert MIFF to ICON raster pixels.
1096         */
1097         pixels=(unsigned char *) AcquireQuantumMemory((size_t)
1098           icon_info.image_size,sizeof(*pixels));
1099         if (pixels == (unsigned char *) NULL)
1100           {
1101             images=DestroyImageList(images);
1102             ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1103           }
1104         (void) ResetMagickMemory(pixels,0,(size_t) icon_info.image_size);
1105         switch (icon_info.bits_per_pixel)
1106         {
1107           case 1:
1108           {
1109             size_t
1110               bit,
1111               byte;
1112
1113             /*
1114               Convert PseudoClass image to a ICON monochrome image.
1115             */
1116             for (y=0; y < (ssize_t) next->rows; y++)
1117             {
1118               p=GetVirtualPixels(next,0,y,next->columns,1,exception);
1119               if (p == (const Quantum *) NULL)
1120                 break;
1121               q=pixels+(next->rows-y-1)*bytes_per_line;
1122               bit=0;
1123               byte=0;
1124               for (x=0; x < (ssize_t) next->columns; x++)
1125               {
1126                 byte<<=1;
1127                 byte|=GetPixelIndex(next,p) != 0 ? 0x01 : 0x00;
1128                 bit++;
1129                 if (bit == 8)
1130                   {
1131                     *q++=(unsigned char) byte;
1132                     bit=0;
1133                     byte=0;
1134                   }
1135                 p+=GetPixelChannels(image);
1136               }
1137               if (bit != 0)
1138                 *q++=(unsigned char) (byte << (8-bit));
1139               if (next->previous == (Image *) NULL)
1140                 {
1141                   status=SetImageProgress(next,SaveImageTag,y,next->rows);
1142                   if (status == MagickFalse)
1143                     break;
1144                 }
1145             }
1146             break;
1147           }
1148           case 4:
1149           {
1150             size_t
1151               nibble,
1152               byte;
1153
1154             /*
1155               Convert PseudoClass image to a ICON monochrome image.
1156             */
1157             for (y=0; y < (ssize_t) next->rows; y++)
1158             {
1159               p=GetVirtualPixels(next,0,y,next->columns,1,exception);
1160               if (p == (const Quantum *) NULL)
1161                 break;
1162               q=pixels+(next->rows-y-1)*bytes_per_line;
1163               nibble=0;
1164               byte=0;
1165               for (x=0; x < (ssize_t) next->columns; x++)
1166               {
1167                 byte<<=4;
1168                 byte|=((size_t) GetPixelIndex(next,p) & 0x0f);
1169                 nibble++;
1170                 if (nibble == 2)
1171                   {
1172                     *q++=(unsigned char) byte;
1173                     nibble=0;
1174                     byte=0;
1175                   }
1176                 p+=GetPixelChannels(image);
1177               }
1178               if (nibble != 0)
1179                 *q++=(unsigned char) (byte << 4);
1180               if (next->previous == (Image *) NULL)
1181                 {
1182                   status=SetImageProgress(next,SaveImageTag,y,next->rows);
1183                   if (status == MagickFalse)
1184                     break;
1185                 }
1186             }
1187             break;
1188           }
1189           case 8:
1190           {
1191             /*
1192               Convert PseudoClass packet to ICON pixel.
1193             */
1194             for (y=0; y < (ssize_t) next->rows; y++)
1195             {
1196               p=GetVirtualPixels(next,0,y,next->columns,1,exception);
1197               if (p == (const Quantum *) NULL)
1198                 break;
1199               q=pixels+(next->rows-y-1)*bytes_per_line;
1200               for (x=0; x < (ssize_t) next->columns; x++)
1201               {
1202                 *q++=(unsigned char) GetPixelIndex(next,p);
1203                 p+=GetPixelChannels(image);
1204               }
1205               if (next->previous == (Image *) NULL)
1206                 {
1207                   status=SetImageProgress(next,SaveImageTag,y,next->rows);
1208                   if (status == MagickFalse)
1209                     break;
1210                 }
1211             }
1212             break;
1213           }
1214           case 24:
1215           case 32:
1216           {
1217             /*
1218               Convert DirectClass packet to ICON BGR888 or BGRA8888 pixel.
1219             */
1220             for (y=0; y < (ssize_t) next->rows; y++)
1221             {
1222               p=GetVirtualPixels(next,0,y,next->columns,1,exception);
1223               if (p == (const Quantum *) NULL)
1224                 break;
1225               q=pixels+(next->rows-y-1)*bytes_per_line;
1226               for (x=0; x < (ssize_t) next->columns; x++)
1227               {
1228                 *q++=ScaleQuantumToChar(GetPixelBlue(next,p));
1229                 *q++=ScaleQuantumToChar(GetPixelGreen(next,p));
1230                 *q++=ScaleQuantumToChar(GetPixelRed(next,p));
1231                 if (next->alpha_trait == UndefinedPixelTrait)
1232                   *q++=ScaleQuantumToChar(QuantumRange);
1233                 else
1234                   *q++=ScaleQuantumToChar(GetPixelAlpha(next,p));
1235                 p+=GetPixelChannels(next);
1236               }
1237               if (icon_info.bits_per_pixel == 24)
1238                 for (x=3L*(ssize_t) next->columns; x < (ssize_t) bytes_per_line; x++)
1239                   *q++=0x00;
1240               if (next->previous == (Image *) NULL)
1241                 {
1242                   status=SetImageProgress(next,SaveImageTag,y,next->rows);
1243                   if (status == MagickFalse)
1244                     break;
1245                 }
1246             }
1247             break;
1248           }
1249         }
1250         /*
1251           Write 40-byte version 3+ bitmap header.
1252         */
1253         icon_file.directory[scene].width=(unsigned char) icon_info.width;
1254         icon_file.directory[scene].height=(unsigned char) icon_info.height;
1255         icon_file.directory[scene].colors=(unsigned char)
1256           icon_info.number_colors;
1257         icon_file.directory[scene].reserved=0;
1258         icon_file.directory[scene].planes=icon_info.planes;
1259         icon_file.directory[scene].bits_per_pixel=icon_info.bits_per_pixel;
1260         icon_file.directory[scene].size=icon_info.size;
1261         icon_file.directory[scene].offset=(size_t) TellBlob(image);
1262         (void) WriteBlobLSBLong(image,(unsigned int) 40);
1263         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.width);
1264         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.height*2);
1265         (void) WriteBlobLSBShort(image,icon_info.planes);
1266         (void) WriteBlobLSBShort(image,icon_info.bits_per_pixel);
1267         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.compression);
1268         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.image_size);
1269         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.x_pixels);
1270         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.y_pixels);
1271         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.number_colors);
1272         (void) WriteBlobLSBLong(image,(unsigned int) icon_info.colors_important);
1273         if (next->storage_class == PseudoClass)
1274           {
1275             unsigned char
1276               *icon_colormap;
1277
1278             /*
1279               Dump colormap to file.
1280             */
1281             icon_colormap=(unsigned char *) AcquireQuantumMemory((size_t)
1282               (1UL << icon_info.bits_per_pixel),4UL*sizeof(*icon_colormap));
1283             if (icon_colormap == (unsigned char *) NULL)
1284               {
1285                 images=DestroyImageList(images);
1286                 ThrowWriterException(ResourceLimitError,
1287                   "MemoryAllocationFailed");
1288               }
1289             q=icon_colormap;
1290             for (i=0; i < (ssize_t) next->colors; i++)
1291             {
1292               *q++=ScaleQuantumToChar(next->colormap[i].blue);
1293               *q++=ScaleQuantumToChar(next->colormap[i].green);
1294               *q++=ScaleQuantumToChar(next->colormap[i].red);
1295               *q++=(unsigned char) 0x0;
1296             }
1297             for ( ; i < (ssize_t) (1UL << icon_info.bits_per_pixel); i++)
1298             {
1299               *q++=(unsigned char) 0x00;
1300               *q++=(unsigned char) 0x00;
1301               *q++=(unsigned char) 0x00;
1302               *q++=(unsigned char) 0x00;
1303             }
1304             (void) WriteBlob(image,(size_t) (4UL*(1UL <<
1305               icon_info.bits_per_pixel)),icon_colormap);
1306             icon_colormap=(unsigned char *) RelinquishMagickMemory(
1307               icon_colormap);
1308           }
1309         (void) WriteBlob(image,(size_t) icon_info.image_size,pixels);
1310         pixels=(unsigned char *) RelinquishMagickMemory(pixels);
1311         /*
1312           Write matte mask.
1313         */
1314         scanline_pad=(((next->columns+31) & ~31)-next->columns) >> 3;
1315         for (y=((ssize_t) next->rows - 1); y >= 0; y--)
1316         {
1317           p=GetVirtualPixels(next,0,y,next->columns,1,exception);
1318           if (p == (const Quantum *) NULL)
1319             break;
1320           bit=0;
1321           byte=0;
1322           for (x=0; x < (ssize_t) next->columns; x++)
1323           {
1324             byte<<=1;
1325             if ((next->alpha_trait != UndefinedPixelTrait) &&
1326                 (GetPixelAlpha(next,p) == (Quantum) TransparentAlpha))
1327               byte|=0x01;
1328             bit++;
1329             if (bit == 8)
1330               {
1331                 (void) WriteBlobByte(image,(unsigned char) byte);
1332                 bit=0;
1333                 byte=0;
1334               }
1335             p+=GetPixelChannels(next);
1336           }
1337           if (bit != 0)
1338             (void) WriteBlobByte(image,(unsigned char) (byte << (8-bit)));
1339           for (i=0; i < (ssize_t) scanline_pad; i++)
1340             (void) WriteBlobByte(image,(unsigned char) 0);
1341         }
1342       }
1343     if (GetNextImageInList(next) == (Image *) NULL)
1344       break;
1345     status=SetImageProgress(next,SaveImagesTag,scene++,
1346       GetImageListLength(next));
1347     if (status == MagickFalse)
1348       break;
1349     next=SyncNextImageInList(next);
1350   } while ((next != (Image *) NULL) && (image_info->adjoin != MagickFalse));
1351   offset=SeekBlob(image,0,SEEK_SET);
1352   (void) offset;
1353   (void) WriteBlobLSBShort(image,0);
1354   (void) WriteBlobLSBShort(image,1);
1355   (void) WriteBlobLSBShort(image,(unsigned short) (scene+1));
1356   scene=0;
1357   next=(images != (Image *) NULL) ? images : image;
1358   do
1359   {
1360     (void) WriteBlobByte(image,icon_file.directory[scene].width);
1361     (void) WriteBlobByte(image,icon_file.directory[scene].height);
1362     (void) WriteBlobByte(image,icon_file.directory[scene].colors);
1363     (void) WriteBlobByte(image,icon_file.directory[scene].reserved);
1364     (void) WriteBlobLSBShort(image,icon_file.directory[scene].planes);
1365     (void) WriteBlobLSBShort(image,icon_file.directory[scene].bits_per_pixel);
1366     (void) WriteBlobLSBLong(image,(unsigned int)
1367       icon_file.directory[scene].size);
1368     (void) WriteBlobLSBLong(image,(unsigned int)
1369       icon_file.directory[scene].offset);
1370     scene++;
1371     next=SyncNextImageInList(next);
1372   } while ((next != (Image *) NULL) && (image_info->adjoin != MagickFalse));
1373   (void) CloseBlob(image);
1374   images=DestroyImageList(images);
1375   return(MagickTrue);
1376 }