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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            DDDD   IIIII  BBBB                               %
   7 %                            D   D    I    B   B                              %
   8 %                            D   D    I    BBBB                               %
   9 %                            D   D    I    B   B                              %
  10 %                            DDDD   IIIII  BBBB                               %
  11 %                                                                             %
  12 %                                                                             %
  13 %                   Read/Write Windows DIB Image Format                       %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2017 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/attribute.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/color.h"
  48 #include "MagickCore/color-private.h"
  49 #include "MagickCore/colormap.h"
  50 #include "MagickCore/colormap-private.h"
  51 #include "MagickCore/colorspace.h"
  52 #include "MagickCore/colorspace-private.h"
  53 #include "MagickCore/draw.h"
  54 #include "MagickCore/exception.h"
  55 #include "MagickCore/exception-private.h"
  56 #include "MagickCore/geometry.h"
  57 #include "MagickCore/image.h"
  58 #include "MagickCore/image-private.h"
  59 #include "MagickCore/list.h"
  60 #include "MagickCore/log.h"
  61 #include "MagickCore/magick.h"
  62 #include "MagickCore/memory_.h"
  63 #include "MagickCore/monitor.h"
  64 #include "MagickCore/monitor-private.h"
  65 #include "MagickCore/pixel-accessor.h"
  66 #include "MagickCore/quantum-private.h"
  67 #include "MagickCore/static.h"
  68 #include "MagickCore/string_.h"
  69 #include "MagickCore/module.h"
  70 #include "MagickCore/transform.h"
  71 \f
  72 /*
  73   Typedef declarations.
  74 */
  75 typedef struct _DIBInfo
  76 {
  77   size_t
  78     size;
  79
  80   ssize_t
  81     width,
  82     height;
  83
  84   unsigned short
  85     planes,
  86     bits_per_pixel;
  87
  88   size_t
  89     compression,
  90     image_size,
  91     x_pixels,
  92     y_pixels,
  93     number_colors,
  94     red_mask,
  95     green_mask,
  96     blue_mask,
  97     alpha_mask,
  98     colors_important;
  99
 100   ssize_t
 101     colorspace;
 102
 103   PointInfo
 104     red_primary,
 105     green_primary,
 106     blue_primary,
 107     gamma_scale;
 108 } DIBInfo;
 109 \f
 110 /*
 111   Forward declarations.
 112 */
 113 static MagickBooleanType
 114   WriteDIBImage(const ImageInfo *,Image *,ExceptionInfo *);
 115 \f
 116 /*
 117 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 118 %                                                                             %
 119 %                                                                             %
 120 %                                                                             %
 121 %   D e c o d e I m a g e                                                     %
 122 %                                                                             %
 123 %                                                                             %
 124 %                                                                             %
 125 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 126 %
 127 %  DecodeImage unpacks the packed image pixels into runlength-encoded
 128 %  pixel packets.
 129 %
 130 %  The format of the DecodeImage method is:
 131 %
 132 %      MagickBooleanType DecodeImage(Image *image,
 133 %        const MagickBooleanType compression,unsigned char *pixels)
 134 %
 135 %  A description of each parameter follows:
 136 %
 137 %    o image: the address of a structure of type Image.
 138 %
 139 %    o compression:  A value of 1 means the compressed pixels are runlength
 140 %      encoded for a 256-color bitmap.  A value of 2 means a 16-color bitmap.
 141 %
 142 %    o pixels:  The address of a byte (8 bits) array of pixel data created by
 143 %      the decoding process.
 144 %
 145 */
 146 static MagickBooleanType DecodeImage(Image *image,
 147   const MagickBooleanType compression,unsigned char *pixels)
 148 {
 149 #if !defined(MAGICKCORE_WINDOWS_SUPPORT) || defined(__MINGW32__) || defined(__MINGW64__)
 150 #define BI_RGB  0
 151 #define BI_RLE8  1
 152 #define BI_RLE4  2
 153 #define BI_BITFIELDS  3
 154 #undef BI_JPEG
 155 #define BI_JPEG  4
 156 #undef BI_PNG
 157 #define BI_PNG  5
 158 #endif
 159
 160   int
 161     count;
 162
 163   ssize_t
 164     y;
 165
 166   register ssize_t
 167     i,
 168     x;
 169
 170   register unsigned char
 171     *p,
 172     *q;
 173
 174   unsigned char
 175     byte;
 176
 177   assert(image != (Image *) NULL);
 178   assert(image->signature == MagickCoreSignature);
 179   if (image->debug != MagickFalse)
 180     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 181   assert(pixels != (unsigned char *) NULL);
 182   (void) ResetMagickMemory(pixels,0,(size_t) image->columns*image->rows*
 183     sizeof(*pixels));
 184   byte=0;
 185   x=0;
 186   p=pixels;
 187   q=pixels+(size_t) image->columns*image->rows;
 188   for (y=0; y < (ssize_t) image->rows; )
 189   {
 190     if ((p < pixels) || (p >= q))
 191       break;
 192     count=ReadBlobByte(image);
 193     if (count == EOF)
 194       break;
 195     if (count != 0)
 196       {
 197         count=(int) MagickMin((size_t) count,(size_t) (q-p));
 198         /*
 199           Encoded mode.
 200         */
 201         byte=(unsigned char) ReadBlobByte(image);
 202         if (compression == BI_RLE8)
 203           {
 204             for (i=0; i < count; i++)
 205               *p++=(unsigned char) byte;
 206           }
 207         else
 208           {
 209             for (i=0; i < count; i++)
 210               *p++=(unsigned char)
 211                 ((i & 0x01) != 0 ? (byte & 0x0f) : ((byte >> 4) & 0x0f));
 212           }
 213         x+=count;
 214       }
 215     else
 216       {
 217         /*
 218           Escape mode.
 219         */
 220         count=ReadBlobByte(image);
 221         if (count == 0x01)
 222           return(MagickTrue);
 223         switch (count)
 224         {
 225           case 0x00:
 226           {
 227             /*
 228               End of line.
 229             */
 230             x=0;
 231             y++;
 232             p=pixels+y*image->columns;
 233             break;
 234           }
 235           case 0x02:
 236           {
 237             /*
 238               Delta mode.
 239             */
 240             x+=ReadBlobByte(image);
 241             y+=ReadBlobByte(image);
 242             p=pixels+y*image->columns+x;
 243             break;
 244           }
 245           default:
 246           {
 247             /*
 248               Absolute mode.
 249             */
 250             count=(int) MagickMin((size_t) count,(size_t) (q-p));
 251             if (compression == BI_RLE8)
 252               for (i=0; i < count; i++)
 253                 *p++=(unsigned char) ReadBlobByte(image);
 254             else
 255               for (i=0; i < count; i++)
 256               {
 257                 if ((i & 0x01) == 0)
 258                   byte=(unsigned char) ReadBlobByte(image);
 259                 *p++=(unsigned char)
 260                   ((i & 0x01) != 0 ? (byte & 0x0f) : ((byte >> 4) & 0x0f));
 261               }
 262             x+=count;
 263             /*
 264               Read pad byte.
 265             */
 266             if (compression == BI_RLE8)
 267               {
 268                 if ((count & 0x01) != 0)
 269                   (void) ReadBlobByte(image);
 270               }
 271             else
 272               if (((count & 0x03) == 1) || ((count & 0x03) == 2))
 273                 (void) ReadBlobByte(image);
 274             break;
 275           }
 276         }
 277       }
 278     if (SetImageProgress(image,LoadImageTag,y,image->rows) == MagickFalse)
 279       break;
 280   }
 281   (void) ReadBlobByte(image);  /* end of line */
 282   (void) ReadBlobByte(image);
 283   return(MagickTrue);
 284 }
 285 \f
 286 /*
 287 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 288 %                                                                             %
 289 %                                                                             %
 290 %                                                                             %
 291 %   E n c o d e I m a g e                                                     %
 292 %                                                                             %
 293 %                                                                             %
 294 %                                                                             %
 295 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 296 %
 297 %  EncodeImage compresses pixels using a runlength encoded format.
 298 %
 299 %  The format of the EncodeImage method is:
 300 %
 301 %    static MagickBooleanType EncodeImage(Image *image,
 302 %      const size_t bytes_per_line,const unsigned char *pixels,
 303 %      unsigned char *compressed_pixels)
 304 %
 305 %  A description of each parameter follows:
 306 %
 307 %    o image:  The image.
 308 %
 309 %    o bytes_per_line: the number of bytes in a scanline of compressed pixels
 310 %
 311 %    o pixels:  The address of a byte (8 bits) array of pixel data created by
 312 %      the compression process.
 313 %
 314 %    o compressed_pixels:  The address of a byte (8 bits) array of compressed
 315 %      pixel data.
 316 %
 317 */
 318 static size_t EncodeImage(Image *image,const size_t bytes_per_line,
 319   const unsigned char *pixels,unsigned char *compressed_pixels)
 320 {
 321   ssize_t
 322     y;
 323
 324   register const unsigned char
 325     *p;
 326
 327   register ssize_t
 328     i,
 329     x;
 330
 331   register unsigned char
 332     *q;
 333
 334   /*
 335     Runlength encode pixels.
 336   */
 337   assert(image != (Image *) NULL);
 338   assert(image->signature == MagickCoreSignature);
 339   if (image->debug != MagickFalse)
 340     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 341   assert(pixels != (const unsigned char *) NULL);
 342   assert(compressed_pixels != (unsigned char *) NULL);
 343   p=pixels;
 344   q=compressed_pixels;
 345   i=0;
 346   for (y=0; y < (ssize_t) image->rows; y++)
 347   {
 348     for (x=0; x < (ssize_t) bytes_per_line; x+=i)
 349     {
 350       /*
 351         Determine runlength.
 352       */
 353       for (i=1; ((x+i) < (ssize_t) bytes_per_line); i++)
 354         if ((*(p+i) != *p) || (i == 255))
 355           break;
 356       *q++=(unsigned char) i;
 357       *q++=(*p);
 358       p+=i;
 359     }
 360     /*
 361       End of line.
 362     */
 363     *q++=0x00;
 364     *q++=0x00;
 365     if (SetImageProgress(image,LoadImageTag,y,image->rows) == MagickFalse)
 366       break;
 367   }
 368   /*
 369     End of bitmap.
 370   */
 371   *q++=0;
 372   *q++=0x01;
 373   return((size_t) (q-compressed_pixels));
 374 }
 375 \f
 376 /*
 377 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 378 %                                                                             %
 379 %                                                                             %
 380 %                                                                             %
 381 %   I s D I B                                                                 %
 382 %                                                                             %
 383 %                                                                             %
 384 %                                                                             %
 385 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 386 %
 387 %  IsDIB() returns MagickTrue if the image format type, identified by the
 388 %  magick string, is DIB.
 389 %
 390 %  The format of the IsDIB method is:
 391 %
 392 %      MagickBooleanType IsDIB(const unsigned char *magick,const size_t length)
 393 %
 394 %  A description of each parameter follows:
 395 %
 396 %    o magick: compare image format pattern against these bytes.
 397 %
 398 %    o length: Specifies the length of the magick string.
 399 %
 400 */
 401 static MagickBooleanType IsDIB(const unsigned char *magick,const size_t length)
 402 {
 403   if (length < 2)
 404     return(MagickFalse);
 405   if (memcmp(magick,"\050\000",2) == 0)
 406     return(MagickTrue);
 407   return(MagickFalse);
 408 }
 409 \f
 410 /*
 411 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 412 %                                                                             %
 413 %                                                                             %
 414 %                                                                             %
 415 %   R e a d D I B I m a g e                                                   %
 416 %                                                                             %
 417 %                                                                             %
 418 %                                                                             %
 419 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 420 %
 421 %  ReadDIBImage() reads a Microsoft Windows bitmap image file and
 422 %  returns it.  It allocates the memory necessary for the new Image structure
 423 %  and returns a pointer to the new image.
 424 %
 425 %  The format of the ReadDIBImage method is:
 426 %
 427 %      image=ReadDIBImage(image_info)
 428 %
 429 %  A description of each parameter follows:
 430 %
 431 %    o image_info: the image info.
 432 %
 433 %    o exception: return any errors or warnings in this structure.
 434 %
 435 */
 436 static Image *ReadDIBImage(const ImageInfo *image_info,ExceptionInfo *exception)
 437 {
 438   DIBInfo
 439     dib_info;
 440
 441   Image
 442     *image;
 443
 444   MagickBooleanType
 445     status;
 446
 447   MemoryInfo
 448     *pixel_info;
 449
 450   Quantum
 451     index;
 452
 453   register ssize_t
 454     x;
 455
 456   register Quantum
 457     *q;
 458
 459   register ssize_t
 460     i;
 461
 462   register unsigned char
 463     *p;
 464
 465   size_t
 466     bytes_per_line,
 467     length;
 468
 469   ssize_t
 470     bit,
 471     count,
 472     y;
 473
 474
 475   unsigned char
 476     *pixels;
 477
 478   /*
 479     Open image file.
 480   */
 481   assert(image_info != (const ImageInfo *) NULL);
 482   assert(image_info->signature == MagickCoreSignature);
 483   if (image_info->debug != MagickFalse)
 484     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 485       image_info->filename);
 486   assert(exception != (ExceptionInfo *) NULL);
 487   assert(exception->signature == MagickCoreSignature);
 488   image=AcquireImage(image_info,exception);
 489   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 490   if (status == MagickFalse)
 491     {
 492       image=DestroyImageList(image);
 493       return((Image *) NULL);
 494     }
 495   /*
 496     Determine if this a DIB file.
 497   */
 498   (void) ResetMagickMemory(&dib_info,0,sizeof(dib_info));
 499   dib_info.size=ReadBlobLSBLong(image);
 500   if (dib_info.size != 40)
 501     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 502   /*
 503     Microsoft Windows 3.X DIB image file.
 504   */
 505   dib_info.width=ReadBlobLSBSignedLong(image);
 506   dib_info.height=ReadBlobLSBSignedLong(image);
 507   dib_info.planes=ReadBlobLSBShort(image);
 508   dib_info.bits_per_pixel=ReadBlobLSBShort(image);
 509   if (dib_info.bits_per_pixel > 32)
 510     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 511   dib_info.compression=ReadBlobLSBLong(image);
 512   dib_info.image_size=ReadBlobLSBLong(image);
 513   dib_info.x_pixels=ReadBlobLSBLong(image);
 514   dib_info.y_pixels=ReadBlobLSBLong(image);
 515   dib_info.number_colors=ReadBlobLSBLong(image);
 516   dib_info.colors_important=ReadBlobLSBLong(image);
 517   if ((dib_info.bits_per_pixel != 1) && (dib_info.bits_per_pixel != 4) &&
 518       (dib_info.bits_per_pixel != 8) && (dib_info.bits_per_pixel != 16) &&
 519       (dib_info.bits_per_pixel != 24) && (dib_info.bits_per_pixel != 32))
 520     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 521   if ((dib_info.compression == BI_BITFIELDS) &&
 522       ((dib_info.bits_per_pixel == 16) || (dib_info.bits_per_pixel == 32)))
 523     {
 524       dib_info.red_mask=ReadBlobLSBLong(image);
 525       dib_info.green_mask=ReadBlobLSBLong(image);
 526       dib_info.blue_mask=ReadBlobLSBLong(image);
 527     }
 528   if (EOFBlob(image) != MagickFalse)
 529     ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
 530   if (dib_info.width <= 0)
 531     ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
 532   if (dib_info.height == 0)
 533     ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
 534   if (dib_info.planes != 1)
 535     ThrowReaderException(CorruptImageError,"StaticPlanesValueNotEqualToOne");
 536   if ((dib_info.bits_per_pixel != 1) && (dib_info.bits_per_pixel != 4) &&
 537       (dib_info.bits_per_pixel != 8) && (dib_info.bits_per_pixel != 16) &&
 538       (dib_info.bits_per_pixel != 24) && (dib_info.bits_per_pixel != 32))
 539     ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 540   if (dib_info.bits_per_pixel < 16 &&
 541       dib_info.number_colors > (size_t) (1UL << dib_info.bits_per_pixel))
 542     ThrowReaderException(CorruptImageError,"UnrecognizedNumberOfColors");
 543   if ((dib_info.compression == 1) && (dib_info.bits_per_pixel != 8))
 544     ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 545   if ((dib_info.compression == 2) && (dib_info.bits_per_pixel != 4))
 546     ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 547   if ((dib_info.compression == 3) && (dib_info.bits_per_pixel < 16))
 548     ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 549   switch (dib_info.compression)
 550   {
 551     case BI_RGB:
 552     case BI_RLE8:
 553     case BI_RLE4:
 554     case BI_BITFIELDS:
 555       break;
 556     case BI_JPEG:
 557       ThrowReaderException(CoderError,"JPEGCompressNotSupported");
 558     case BI_PNG:
 559       ThrowReaderException(CoderError,"PNGCompressNotSupported");
 560     default:
 561       ThrowReaderException(CorruptImageError,"UnrecognizedImageCompression");
 562   }
 563   image->columns=(size_t) MagickAbsoluteValue(dib_info.width);
 564   image->rows=(size_t) MagickAbsoluteValue(dib_info.height);
 565   image->depth=8;
 566   image->alpha_trait=dib_info.bits_per_pixel == 32 ? BlendPixelTrait :
 567     UndefinedPixelTrait;
 568   if ((dib_info.number_colors > 256) || (dib_info.colors_important > 256))
 569     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 570   if ((dib_info.number_colors != 0) || (dib_info.bits_per_pixel < 16))
 571     {
 572       size_t
 573         one;
 574
 575       image->storage_class=PseudoClass;
 576       image->colors=dib_info.number_colors;
 577       one=1;
 578       if (image->colors == 0)
 579         image->colors=one << dib_info.bits_per_pixel;
 580     }
 581   if (image_info->size)
 582     {
 583       RectangleInfo
 584         geometry;
 585
 586       MagickStatusType
 587         flags;
 588
 589       flags=ParseAbsoluteGeometry(image_info->size,&geometry);
 590       if (flags & WidthValue)
 591         if ((geometry.width != 0) && (geometry.width < image->columns))
 592           image->columns=geometry.width;
 593       if (flags & HeightValue)
 594         if ((geometry.height != 0) && (geometry.height < image->rows))
 595           image->rows=geometry.height;
 596     }
 597   status=SetImageExtent(image,image->columns,image->rows,exception);
 598   if (status == MagickFalse)
 599     return(DestroyImageList(image));
 600   if (image->storage_class == PseudoClass)
 601     {
 602       size_t
 603         length,
 604         packet_size;
 605
 606       unsigned char
 607         *dib_colormap;
 608
 609       /*
 610         Read DIB raster colormap.
 611       */
 612       if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 613         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 614       length=(size_t) image->colors;
 615       dib_colormap=(unsigned char *) AcquireQuantumMemory(length,
 616         4*sizeof(*dib_colormap));
 617       if (dib_colormap == (unsigned char *) NULL)
 618         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 619       packet_size=4;
 620       count=ReadBlob(image,packet_size*image->colors,dib_colormap);
 621       if (count != (ssize_t) (packet_size*image->colors))
 622         ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
 623       p=dib_colormap;
 624       for (i=0; i < (ssize_t) image->colors; i++)
 625       {
 626         image->colormap[i].blue=ScaleCharToQuantum(*p++);
 627         image->colormap[i].green=ScaleCharToQuantum(*p++);
 628         image->colormap[i].red=ScaleCharToQuantum(*p++);
 629         if (packet_size == 4)
 630           p++;
 631       }
 632       dib_colormap=(unsigned char *) RelinquishMagickMemory(dib_colormap);
 633     }
 634   /*
 635     Read image data.
 636   */
 637   if (dib_info.compression == BI_RLE4)
 638     dib_info.bits_per_pixel<<=1;
 639   bytes_per_line=4*((image->columns*dib_info.bits_per_pixel+31)/32);
 640   length=bytes_per_line*image->rows;
 641   pixel_info=AcquireVirtualMemory((size_t) image->rows,MagickMax(
 642     bytes_per_line,image->columns+256UL)*sizeof(*pixels));
 643   if (pixel_info == (MemoryInfo *) NULL)
 644     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 645   pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
 646   if ((dib_info.compression == BI_RGB) ||
 647       (dib_info.compression == BI_BITFIELDS))
 648     {
 649       count=ReadBlob(image,length,pixels);
 650       if (count != (ssize_t) (length))
 651         {
 652           pixel_info=RelinquishVirtualMemory(pixel_info);
 653           ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
 654         }
 655     }
 656   else
 657     {
 658       /*
 659         Convert run-length encoded raster pixels.
 660       */
 661       status=DecodeImage(image,dib_info.compression ? MagickTrue : MagickFalse,
 662         pixels);
 663       if (status == MagickFalse)
 664         {
 665           pixel_info=RelinquishVirtualMemory(pixel_info);
 666           ThrowReaderException(CorruptImageError,
 667             "UnableToRunlengthDecodeImage");
 668         }
 669     }
 670   /*
 671     Initialize image structure.
 672   */
 673   image->units=PixelsPerCentimeterResolution;
 674   image->resolution.x=(double) dib_info.x_pixels/100.0;
 675   image->resolution.y=(double) dib_info.y_pixels/100.0;
 676   /*
 677     Convert DIB raster image to pixel packets.
 678   */
 679   switch (dib_info.bits_per_pixel)
 680   {
 681     case 1:
 682     {
 683       /*
 684         Convert bitmap scanline.
 685       */
 686       for (y=(ssize_t) image->rows-1; y >= 0; y--)
 687       {
 688         p=pixels+(image->rows-y-1)*bytes_per_line;
 689         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 690         if (q == (Quantum *) NULL)
 691           break;
 692         for (x=0; x < ((ssize_t) image->columns-7); x+=8)
 693         {
 694           for (bit=0; bit < 8; bit++)
 695           {
 696             index=(Quantum) ((*p) & (0x80 >> bit) ? 0x01 : 0x00);
 697             SetPixelIndex(image,index,q);
 698             q+=GetPixelChannels(image);
 699           }
 700           p++;
 701         }
 702         if ((image->columns % 8) != 0)
 703           {
 704             for (bit=0; bit < (ssize_t) (image->columns % 8); bit++)
 705             {
 706               index=(Quantum) ((*p) & (0x80 >> bit) ? 0x01 : 0x00);
 707               SetPixelIndex(image,index,q);
 708               q+=GetPixelChannels(image);
 709             }
 710             p++;
 711           }
 712         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 713           break;
 714         if (image->previous == (Image *) NULL)
 715           {
 716             status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 717               image->rows);
 718             if (status == MagickFalse)
 719               break;
 720           }
 721       }
 722       (void) SyncImage(image,exception);
 723       break;
 724     }
 725     case 4:
 726     {
 727       /*
 728         Convert PseudoColor scanline.
 729       */
 730       for (y=(ssize_t) image->rows-1; y >= 0; y--)
 731       {
 732         p=pixels+(image->rows-y-1)*bytes_per_line;
 733         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 734         if (q == (Quantum *) NULL)
 735           break;
 736         for (x=0; x < ((ssize_t) image->columns-1); x+=2)
 737         {
 738           index=ConstrainColormapIndex(image,(*p >> 4) & 0xf,exception);
 739           SetPixelIndex(image,index,q);
 740           q+=GetPixelChannels(image);
 741           index=ConstrainColormapIndex(image,*p & 0xf,exception);
 742           SetPixelIndex(image,index,q);
 743           p++;
 744           q+=GetPixelChannels(image);
 745         }
 746         if ((image->columns % 2) != 0)
 747           {
 748             index=ConstrainColormapIndex(image,(*p >> 4) & 0xf,exception);
 749             SetPixelIndex(image,index,q);
 750             q+=GetPixelChannels(image);
 751             p++;
 752           }
 753         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 754           break;
 755         if (image->previous == (Image *) NULL)
 756           {
 757             status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 758               image->rows);
 759             if (status == MagickFalse)
 760               break;
 761           }
 762       }
 763       (void) SyncImage(image,exception);
 764       break;
 765     }
 766     case 8:
 767     {
 768       /*
 769         Convert PseudoColor scanline.
 770       */
 771       if ((dib_info.compression == BI_RLE8) ||
 772           (dib_info.compression == BI_RLE4))
 773         bytes_per_line=image->columns;
 774       for (y=(ssize_t) image->rows-1; y >= 0; y--)
 775       {
 776         p=pixels+(image->rows-y-1)*bytes_per_line;
 777         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 778         if (q == (Quantum *) NULL)
 779           break;
 780         for (x=0; x < (ssize_t) image->columns; x++)
 781         {
 782           index=ConstrainColormapIndex(image,*p,exception);
 783           SetPixelIndex(image,index,q);
 784           p++;
 785           q+=GetPixelChannels(image);
 786         }
 787         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 788           break;
 789         if (image->previous == (Image *) NULL)
 790           {
 791             status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 792               image->rows);
 793             if (status == MagickFalse)
 794               break;
 795           }
 796       }
 797       (void) SyncImage(image,exception);
 798       break;
 799     }
 800     case 16:
 801     {
 802       unsigned short
 803         word;
 804
 805       /*
 806         Convert PseudoColor scanline.
 807       */
 808       image->storage_class=DirectClass;
 809       if (dib_info.compression == BI_RLE8)
 810         bytes_per_line=2*image->columns;
 811       for (y=(ssize_t) image->rows-1; y >= 0; y--)
 812       {
 813         p=pixels+(image->rows-y-1)*bytes_per_line;
 814         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 815         if (q == (Quantum *) NULL)
 816           break;
 817         for (x=0; x < (ssize_t) image->columns; x++)
 818         {
 819           word=(*p++);
 820           word|=(*p++ << 8);
 821           if (dib_info.red_mask == 0)
 822             {
 823               SetPixelRed(image,ScaleCharToQuantum(ScaleColor5to8(
 824                 (unsigned char) ((word >> 10) & 0x1f))),q);
 825               SetPixelGreen(image,ScaleCharToQuantum(ScaleColor5to8(
 826                 (unsigned char) ((word >> 5) & 0x1f))),q);
 827               SetPixelBlue(image,ScaleCharToQuantum(ScaleColor5to8(
 828                 (unsigned char) (word & 0x1f))),q);
 829             }
 830           else
 831             {
 832               SetPixelRed(image,ScaleCharToQuantum(ScaleColor5to8(
 833                 (unsigned char) ((word >> 11) & 0x1f))),q);
 834               SetPixelGreen(image,ScaleCharToQuantum(ScaleColor6to8(
 835                 (unsigned char) ((word >> 5) & 0x3f))),q);
 836               SetPixelBlue(image,ScaleCharToQuantum(ScaleColor5to8(
 837                 (unsigned char) (word & 0x1f))),q);
 838             }
 839           q+=GetPixelChannels(image);
 840         }
 841         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 842           break;
 843         if (image->previous == (Image *) NULL)
 844           {
 845             status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 846               image->rows);
 847             if (status == MagickFalse)
 848               break;
 849           }
 850       }
 851       break;
 852     }
 853     case 24:
 854     case 32:
 855     {
 856       /*
 857         Convert DirectColor scanline.
 858       */
 859       for (y=(ssize_t) image->rows-1; y >= 0; y--)
 860       {
 861         p=pixels+(image->rows-y-1)*bytes_per_line;
 862         q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 863         if (q == (Quantum *) NULL)
 864           break;
 865         for (x=0; x < (ssize_t) image->columns; x++)
 866         {
 867           SetPixelBlue(image,ScaleCharToQuantum(*p++),q);
 868           SetPixelGreen(image,ScaleCharToQuantum(*p++),q);
 869           SetPixelRed(image,ScaleCharToQuantum(*p++),q);
 870           if (image->alpha_trait != UndefinedPixelTrait)
 871             SetPixelAlpha(image,ScaleCharToQuantum(*p++),q);
 872           q+=GetPixelChannels(image);
 873         }
 874         if (SyncAuthenticPixels(image,exception) == MagickFalse)
 875           break;
 876         if (image->previous == (Image *) NULL)
 877           {
 878             status=SetImageProgress(image,LoadImageTag,image->rows-y-1,
 879               image->rows);
 880             if (status == MagickFalse)
 881               break;
 882           }
 883       }
 884       break;
 885     }
 886     default:
 887       pixel_info=RelinquishVirtualMemory(pixel_info);
 888       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 889   }
 890   pixel_info=RelinquishVirtualMemory(pixel_info);
 891   if (EOFBlob(image) != MagickFalse)
 892     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 893       image->filename);
 894   if (dib_info.height < 0)
 895     {
 896       Image
 897         *flipped_image;
 898
 899       /*
 900         Correct image orientation.
 901       */
 902       flipped_image=FlipImage(image,exception);
 903       if (flipped_image != (Image *) NULL)
 904         {
 905           DuplicateBlob(flipped_image,image);
 906           image=DestroyImage(image);
 907           image=flipped_image;
 908         }
 909     }
 910   (void) CloseBlob(image);
 911   return(GetFirstImageInList(image));
 912 }
 913 \f
 914 /*
 915 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 916 %                                                                             %
 917 %                                                                             %
 918 %                                                                             %
 919 %   R e g i s t e r D I B I m a g e                                           %
 920 %                                                                             %
 921 %                                                                             %
 922 %                                                                             %
 923 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 924 %
 925 %  RegisterDIBImage() adds attributes for the DIB image format to
 926 %  the list of supported formats.  The attributes include the image format
 927 %  tag, a method to read and/or write the format, whether the format
 928 %  supports the saving of more than one frame to the same file or blob,
 929 %  whether the format supports native in-memory I/O, and a brief
 930 %  description of the format.
 931 %
 932 %  The format of the RegisterDIBImage method is:
 933 %
 934 %      size_t RegisterDIBImage(void)
 935 %
 936 */
 937 ModuleExport size_t RegisterDIBImage(void)
 938 {
 939   MagickInfo
 940     *entry;
 941
 942   entry=AcquireMagickInfo("DIB","DIB",
 943     "Microsoft Windows 3.X Packed Device-Independent Bitmap");
 944   entry->decoder=(DecodeImageHandler *) ReadDIBImage;
 945   entry->encoder=(EncodeImageHandler *) WriteDIBImage;
 946   entry->magick=(IsImageFormatHandler *) IsDIB;
 947   entry->flags^=CoderAdjoinFlag;
 948   entry->flags|=CoderStealthFlag;
 949   (void) RegisterMagickInfo(entry);
 950   return(MagickImageCoderSignature);
 951 }
 952 \f
 953 /*
 954 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 955 %                                                                             %
 956 %                                                                             %
 957 %                                                                             %
 958 %   U n r e g i s t e r D I B I m a g e                                       %
 959 %                                                                             %
 960 %                                                                             %
 961 %                                                                             %
 962 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 963 %
 964 %  UnregisterDIBImage() removes format registrations made by the
 965 %  DIB module from the list of supported formats.
 966 %
 967 %  The format of the UnregisterDIBImage method is:
 968 %
 969 %      UnregisterDIBImage(void)
 970 %
 971 */
 972 ModuleExport void UnregisterDIBImage(void)
 973 {
 974   (void) UnregisterMagickInfo("DIB");
 975 }
 976 \f
 977 /*
 978 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 979 %                                                                             %
 980 %                                                                             %
 981 %                                                                             %
 982 %   W r i t e D I B I m a g e                                                 %
 983 %                                                                             %
 984 %                                                                             %
 985 %                                                                             %
 986 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 987 %
 988 %  WriteDIBImage() writes an image in Microsoft Windows bitmap encoded
 989 %  image format.
 990 %
 991 %  The format of the WriteDIBImage method is:
 992 %
 993 %      MagickBooleanType WriteDIBImage(const ImageInfo *image_info,
 994 %        Image *image,ExceptionInfo *exception)
 995 %
 996 %  A description of each parameter follows.
 997 %
 998 %    o image_info: the image info.
 999 %
1000 %    o image:  The image.
1001 %
1002 %    o exception: return any errors or warnings in this structure.
1003 %
1004 */
1005 static MagickBooleanType WriteDIBImage(const ImageInfo *image_info,Image *image,
1006   ExceptionInfo *exception)
1007 {
1008   DIBInfo
1009     dib_info;
1010
1011   MagickBooleanType
1012     status;
1013
1014   register const Quantum
1015     *p;
1016
1017   register ssize_t
1018     i,
1019     x;
1020
1021   register unsigned char
1022     *q;
1023
1024   size_t
1025     bytes_per_line;
1026
1027   ssize_t
1028     y;
1029
1030   unsigned char
1031     *dib_data,
1032     *pixels;
1033
1034   /*
1035     Open output image file.
1036   */
1037   assert(image_info != (const ImageInfo *) NULL);
1038   assert(image_info->signature == MagickCoreSignature);
1039   assert(image != (Image *) NULL);
1040   assert(image->signature == MagickCoreSignature);
1041   if (image->debug != MagickFalse)
1042     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1043   assert(exception != (ExceptionInfo *) NULL);
1044   assert(exception->signature == MagickCoreSignature);
1045   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
1046   if (status == MagickFalse)
1047     return(status);
1048   /*
1049     Initialize DIB raster file header.
1050   */
1051   (void) TransformImageColorspace(image,sRGBColorspace,exception);
1052   if (image->storage_class == DirectClass)
1053     {
1054       /*
1055         Full color DIB raster.
1056       */
1057       dib_info.number_colors=0;
1058       dib_info.bits_per_pixel=(unsigned short) (image->alpha_trait ? 32 : 24);
1059     }
1060   else
1061     {
1062       /*
1063         Colormapped DIB raster.
1064       */
1065       dib_info.bits_per_pixel=8;
1066       if (image_info->depth > 8)
1067         dib_info.bits_per_pixel=16;
1068       if (SetImageMonochrome(image,exception) != MagickFalse)
1069         dib_info.bits_per_pixel=1;
1070       dib_info.number_colors=(dib_info.bits_per_pixel == 16) ? 0 :
1071         (1UL << dib_info.bits_per_pixel);
1072     }
1073   bytes_per_line=4*((image->columns*dib_info.bits_per_pixel+31)/32);
1074   dib_info.size=40;
1075   dib_info.width=(ssize_t) image->columns;
1076   dib_info.height=(ssize_t) image->rows;
1077   dib_info.planes=1;
1078   dib_info.compression=(size_t) (dib_info.bits_per_pixel == 16 ?
1079     BI_BITFIELDS : BI_RGB);
1080   dib_info.image_size=bytes_per_line*image->rows;
1081   dib_info.x_pixels=75*39;
1082   dib_info.y_pixels=75*39;
1083   switch (image->units)
1084   {
1085     case UndefinedResolution:
1086     case PixelsPerInchResolution:
1087     {
1088       dib_info.x_pixels=(size_t) (100.0*image->resolution.x/2.54);
1089       dib_info.y_pixels=(size_t) (100.0*image->resolution.y/2.54);
1090       break;
1091     }
1092     case PixelsPerCentimeterResolution:
1093     {
1094       dib_info.x_pixels=(size_t) (100.0*image->resolution.x);
1095       dib_info.y_pixels=(size_t) (100.0*image->resolution.y);
1096       break;
1097     }
1098   }
1099   dib_info.colors_important=dib_info.number_colors;
1100   /*
1101     Convert MIFF to DIB raster pixels.
1102   */
1103   pixels=(unsigned char *) AcquireQuantumMemory(dib_info.image_size,
1104     sizeof(*pixels));
1105   if (pixels == (unsigned char *) NULL)
1106     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1107   (void) ResetMagickMemory(pixels,0,dib_info.image_size);
1108   switch (dib_info.bits_per_pixel)
1109   {
1110     case 1:
1111     {
1112       register unsigned char
1113         bit,
1114         byte;
1115
1116       /*
1117         Convert PseudoClass image to a DIB monochrome image.
1118       */
1119       for (y=0; y < (ssize_t) image->rows; y++)
1120       {
1121         p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1122         if (p == (const Quantum *) NULL)
1123           break;
1124         q=pixels+(image->rows-y-1)*bytes_per_line;
1125         bit=0;
1126         byte=0;
1127         for (x=0; x < (ssize_t) image->columns; x++)
1128         {
1129           byte<<=1;
1130           byte|=GetPixelIndex(image,p) != 0 ? 0x01 : 0x00;
1131           bit++;
1132           if (bit == 8)
1133             {
1134               *q++=byte;
1135               bit=0;
1136               byte=0;
1137             }
1138            p+=GetPixelChannels(image);
1139          }
1140          if (bit != 0)
1141            {
1142              *q++=(unsigned char) (byte << (8-bit));
1143              x++;
1144            }
1145         for (x=(ssize_t) (image->columns+7)/8; x < (ssize_t) bytes_per_line; x++)
1146           *q++=0x00;
1147         status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1148           image->rows);
1149         if (status == MagickFalse)
1150           break;
1151       }
1152       break;
1153     }
1154     case 8:
1155     {
1156       /*
1157         Convert PseudoClass packet to DIB pixel.
1158       */
1159       for (y=0; y < (ssize_t) image->rows; y++)
1160       {
1161         p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1162         if (p == (const Quantum *) NULL)
1163           break;
1164         q=pixels+(image->rows-y-1)*bytes_per_line;
1165         for (x=0; x < (ssize_t) image->columns; x++)
1166         {
1167           *q++=(unsigned char) GetPixelIndex(image,p);
1168           p+=GetPixelChannels(image);
1169         }
1170         for ( ; x < (ssize_t) bytes_per_line; x++)
1171           *q++=0x00;
1172         status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1173           image->rows);
1174         if (status == MagickFalse)
1175           break;
1176       }
1177       break;
1178     }
1179     case 16:
1180     {
1181       unsigned short
1182         word;
1183       /*
1184         Convert PseudoClass packet to DIB pixel.
1185       */
1186       for (y=0; y < (ssize_t) image->rows; y++)
1187       {
1188         p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1189         if (p == (const Quantum *) NULL)
1190           break;
1191         q=pixels+(image->rows-y-1)*bytes_per_line;
1192         for (x=0; x < (ssize_t) image->columns; x++)
1193         {
1194           word=(unsigned short) ((ScaleColor8to5((unsigned char)
1195             ScaleQuantumToChar(GetPixelRed(image,p))) << 11) | (ScaleColor8to6(
1196             (unsigned char) ScaleQuantumToChar(GetPixelGreen(image,p))) << 5) |
1197             (ScaleColor8to5((unsigned char) ScaleQuantumToChar((unsigned char)
1198             GetPixelBlue(image,p)) << 0)));
1199           *q++=(unsigned char)(word & 0xff);
1200           *q++=(unsigned char)(word >> 8);
1201           p+=GetPixelChannels(image);
1202         }
1203         for (x=(ssize_t) (2*image->columns); x < (ssize_t) bytes_per_line; x++)
1204           *q++=0x00;
1205         status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1206           image->rows);
1207         if (status == MagickFalse)
1208           break;
1209       }
1210       break;
1211     }
1212     case 24:
1213     case 32:
1214     {
1215       /*
1216         Convert DirectClass packet to DIB RGB pixel.
1217       */
1218       for (y=0; y < (ssize_t) image->rows; y++)
1219       {
1220         p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1221         if (p == (const Quantum *) NULL)
1222           break;
1223         q=pixels+(image->rows-y-1)*bytes_per_line;
1224         for (x=0; x < (ssize_t) image->columns; x++)
1225         {
1226           *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1227           *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1228           *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1229           if (image->alpha_trait != UndefinedPixelTrait)
1230             *q++=ScaleQuantumToChar(GetPixelAlpha(image,p));
1231           p+=GetPixelChannels(image);
1232         }
1233         if (dib_info.bits_per_pixel == 24)
1234           for (x=(ssize_t) (3*image->columns); x < (ssize_t) bytes_per_line; x++)
1235             *q++=0x00;
1236         status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1237           image->rows);
1238         if (status == MagickFalse)
1239           break;
1240       }
1241       break;
1242     }
1243   }
1244   if (dib_info.bits_per_pixel == 8)
1245     if (image_info->compression != NoCompression)
1246       {
1247         size_t
1248           length;
1249
1250         /*
1251           Convert run-length encoded raster pixels.
1252         */
1253         length=2UL*(bytes_per_line+2UL)+2UL;
1254         dib_data=(unsigned char *) AcquireQuantumMemory(length,
1255           (image->rows+2UL)*sizeof(*dib_data));
1256         if (dib_data == (unsigned char *) NULL)
1257           {
1258             pixels=(unsigned char *) RelinquishMagickMemory(pixels);
1259             ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1260           }
1261         dib_info.image_size=(size_t) EncodeImage(image,bytes_per_line,
1262           pixels,dib_data);
1263         pixels=(unsigned char *) RelinquishMagickMemory(pixels);
1264         pixels=dib_data;
1265         dib_info.compression = BI_RLE8;
1266       }
1267   /*
1268     Write DIB header.
1269   */
1270   (void) WriteBlobLSBLong(image,(unsigned int) dib_info.size);
1271   (void) WriteBlobLSBLong(image,dib_info.width);
1272   (void) WriteBlobLSBLong(image,(unsigned short) dib_info.height);
1273   (void) WriteBlobLSBShort(image,(unsigned short) dib_info.planes);
1274   (void) WriteBlobLSBShort(image,dib_info.bits_per_pixel);
1275   (void) WriteBlobLSBLong(image,(unsigned int) dib_info.compression);
1276   (void) WriteBlobLSBLong(image,(unsigned int) dib_info.image_size);
1277   (void) WriteBlobLSBLong(image,(unsigned int) dib_info.x_pixels);
1278   (void) WriteBlobLSBLong(image,(unsigned int) dib_info.y_pixels);
1279   (void) WriteBlobLSBLong(image,(unsigned int) dib_info.number_colors);
1280   (void) WriteBlobLSBLong(image,(unsigned int) dib_info.colors_important);
1281   if (image->storage_class == PseudoClass)
1282     {
1283       if (dib_info.bits_per_pixel <= 8)
1284         {
1285           unsigned char
1286             *dib_colormap;
1287
1288           /*
1289             Dump colormap to file.
1290           */
1291           dib_colormap=(unsigned char *) AcquireQuantumMemory((size_t)
1292             (1UL << dib_info.bits_per_pixel),4*sizeof(*dib_colormap));
1293           if (dib_colormap == (unsigned char *) NULL)
1294             ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1295           q=dib_colormap;
1296           for (i=0; i < (ssize_t) MagickMin(image->colors,dib_info.number_colors); i++)
1297           {
1298             *q++=ScaleQuantumToChar(image->colormap[i].blue);
1299             *q++=ScaleQuantumToChar(image->colormap[i].green);
1300             *q++=ScaleQuantumToChar(image->colormap[i].red);
1301             *q++=(Quantum) 0x0;
1302           }
1303           for ( ; i < (ssize_t) (1L << dib_info.bits_per_pixel); i++)
1304           {
1305             *q++=(Quantum) 0x0;
1306             *q++=(Quantum) 0x0;
1307             *q++=(Quantum) 0x0;
1308             *q++=(Quantum) 0x0;
1309           }
1310           (void) WriteBlob(image,(size_t) (4*(1 << dib_info.bits_per_pixel)),
1311             dib_colormap);
1312           dib_colormap=(unsigned char *) RelinquishMagickMemory(dib_colormap);
1313         }
1314       else
1315         if ((dib_info.bits_per_pixel == 16) &&
1316             (dib_info.compression == BI_BITFIELDS))
1317           {
1318             (void) WriteBlobLSBLong(image,0xf800);
1319             (void) WriteBlobLSBLong(image,0x07e0);
1320             (void) WriteBlobLSBLong(image,0x001f);
1321           }
1322     }
1323   (void) WriteBlob(image,dib_info.image_size,pixels);
1324   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
1325   (void) CloseBlob(image);
1326   return(MagickTrue);
1327 }