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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            BBBB   M   M  PPPP                               %
   7 %                            B   B  MM MM  P   P                              %
   8 %                            BBBB   M M M  PPPP                               %
   9 %                            B   B  M   M  P                                  %
  10 %                            BBBB   M   M  P                                  %
  11 %                                                                             %
  12 %                                                                             %
  13 %             Read/Write Microsoft Windows Bitmap Image Format                %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                            Glenn Randers-Pehrson                            %
  18 %                               December 2001                                 %
  19 %                                                                             %
  20 %                                                                             %
  21 %  Copyright 1999-2012 ImageMagick Studio LLC, a non-profit organization      %
  22 %  dedicated to making software imaging solutions freely available.           %
  23 %                                                                             %
  24 %  You may not use this file except in compliance with the License.  You may  %
  25 %  obtain a copy of the License at                                            %
  26 %                                                                             %
  27 %    http://www.imagemagick.org/script/license.php                            %
  28 %                                                                             %
  29 %  Unless required by applicable law or agreed to in writing, software        %
  30 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  31 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  32 %  See the License for the specific language governing permissions and        %
  33 %  limitations under the License.                                             %
  34 %                                                                             %
  35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  36 %
  37 %
  38 */
  39 \f
  40 /*
  41   Include declarations.
  42 */
  43 #include "MagickCore/studio.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/colormap-private.h"
  48 #include "MagickCore/color-private.h"
  49 #include "MagickCore/colormap.h"
  50 #include "MagickCore/colorspace.h"
  51 #include "MagickCore/colorspace-private.h"
  52 #include "MagickCore/exception.h"
  53 #include "MagickCore/exception-private.h"
  54 #include "MagickCore/image.h"
  55 #include "MagickCore/image-private.h"
  56 #include "MagickCore/list.h"
  57 #include "MagickCore/log.h"
  58 #include "MagickCore/magick.h"
  59 #include "MagickCore/memory_.h"
  60 #include "MagickCore/monitor.h"
  61 #include "MagickCore/monitor-private.h"
  62 #include "MagickCore/pixel-accessor.h"
  63 #include "MagickCore/profile.h"
  64 #include "MagickCore/quantum-private.h"
  65 #include "MagickCore/static.h"
  66 #include "MagickCore/string_.h"
  67 #include "MagickCore/module.h"
  68 #include "MagickCore/transform.h"
  69 \f
  70 /*
  71   Macro definitions (from Windows wingdi.h).
  72 */
  73 #undef BI_JPEG
  74 #define BI_JPEG  4
  75 #undef BI_PNG
  76 #define BI_PNG  5
  77 #if !defined(MAGICKCORE_WINDOWS_SUPPORT) || defined(__MINGW32__)
  78 #undef BI_RGB
  79 #define BI_RGB  0
  80 #undef BI_RLE8
  81 #define BI_RLE8  1
  82 #undef BI_RLE4
  83 #define BI_RLE4  2
  84 #undef BI_BITFIELDS
  85 #define BI_BITFIELDS  3
  86
  87 #undef LCS_CALIBRATED_RBG
  88 #define LCS_CALIBRATED_RBG  0
  89 #undef LCS_sRGB
  90 #define LCS_sRGB  1
  91 #undef LCS_WINDOWS_COLOR_SPACE
  92 #define LCS_WINDOWS_COLOR_SPACE  2
  93 #undef PROFILE_LINKED
  94 #define PROFILE_LINKED  3
  95 #undef PROFILE_EMBEDDED
  96 #define PROFILE_EMBEDDED  4
  97
  98 #undef LCS_GM_BUSINESS
  99 #define LCS_GM_BUSINESS  1  /* Saturation */
 100 #undef LCS_GM_GRAPHICS
 101 #define LCS_GM_GRAPHICS  2  /* Relative */
 102 #undef LCS_GM_IMAGES
 103 #define LCS_GM_IMAGES  4  /* Perceptual */
 104 #undef LCS_GM_ABS_COLORIMETRIC
 105 #define LCS_GM_ABS_COLORIMETRIC  8  /* Absolute */
 106 #endif
 107 \f
 108 /*
 109   Typedef declarations.
 110 */
 111 typedef struct _BMPInfo
 112 {
 113   unsigned int
 114     file_size,
 115     ba_offset,
 116     offset_bits,
 117     size;
 118
 119   ssize_t
 120     width,
 121     height;
 122
 123   unsigned short
 124     planes,
 125     bits_per_pixel;
 126
 127   unsigned int
 128     compression,
 129     image_size,
 130     x_pixels,
 131     y_pixels,
 132     number_colors,
 133     red_mask,
 134     green_mask,
 135     blue_mask,
 136     alpha_mask,
 137     colors_important;
 138
 139   int
 140     colorspace;
 141
 142   PrimaryInfo
 143     red_primary,
 144     green_primary,
 145     blue_primary,
 146     gamma_scale;
 147 } BMPInfo;
 148 \f
 149 /*
 150   Forward declarations.
 151 */
 152 static MagickBooleanType
 153   WriteBMPImage(const ImageInfo *,Image *,ExceptionInfo *);
 154 \f
 155 /*
 156 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 157 %                                                                             %
 158 %                                                                             %
 159 %                                                                             %
 160 %   D e c o d e I m a g e                                                     %
 161 %                                                                             %
 162 %                                                                             %
 163 %                                                                             %
 164 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 165 %
 166 %  DecodeImage unpacks the packed image pixels into runlength-encoded
 167 %  pixel packets.
 168 %
 169 %  The format of the DecodeImage method is:
 170 %
 171 %      MagickBooleanType DecodeImage(Image *image,
 172 %        const size_t compression,unsigned char *pixels)
 173 %
 174 %  A description of each parameter follows:
 175 %
 176 %    o image: the address of a structure of type Image.
 177 %
 178 %    o compression:  Zero means uncompressed.  A value of 1 means the
 179 %      compressed pixels are runlength encoded for a 256-color bitmap.
 180 %      A value of 2 means a 16-color bitmap.  A value of 3 means bitfields
 181 %      encoding.
 182 %
 183 %    o pixels:  The address of a byte (8 bits) array of pixel data created by
 184 %      the decoding process.
 185 %
 186 */
 187
 188 static inline ssize_t MagickAbsoluteValue(const ssize_t x)
 189 {
 190   if (x < 0)
 191     return(-x);
 192   return(x);
 193 }
 194
 195 static inline size_t MagickMax(const size_t x,const size_t y)
 196 {
 197   if (x > y)
 198     return(x);
 199   return(y);
 200 }
 201
 202 static inline ssize_t MagickMin(const ssize_t x,const ssize_t y)
 203 {
 204   if (x < y)
 205     return(x);
 206   return(y);
 207 }
 208
 209 static MagickBooleanType DecodeImage(Image *image,const size_t compression,
 210   unsigned char *pixels)
 211 {
 212   int
 213     count;
 214
 215   register ssize_t
 216     i,
 217     x;
 218
 219   register unsigned char
 220     *p,
 221     *q;
 222
 223   ssize_t
 224     y;
 225
 226   unsigned char
 227     byte;
 228
 229   assert(image != (Image *) NULL);
 230   assert(image->signature == MagickSignature);
 231   if (image->debug != MagickFalse)
 232     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 233   assert(pixels != (unsigned char *) NULL);
 234   (void) ResetMagickMemory(pixels,0,(size_t) image->columns*image->rows*
 235     sizeof(*pixels));
 236   byte=0;
 237   x=0;
 238   p=pixels;
 239   q=pixels+(size_t) image->columns*image->rows;
 240   for (y=0; y < (ssize_t) image->rows; )
 241   {
 242     if ((p < pixels) || (p >= q))
 243       break;
 244     count=ReadBlobByte(image);
 245     if (count == EOF)
 246       break;
 247     if (count != 0)
 248       {
 249         /*
 250           Encoded mode.
 251         */
 252         count=MagickMin(count,(int) (q-p));
 253         byte=(unsigned char) ReadBlobByte(image);
 254         if (compression == BI_RLE8)
 255           {
 256             for (i=0; i < count; i++)
 257               *p++=(unsigned char) byte;
 258           }
 259         else
 260           {
 261             for (i=0; i < count; i++)
 262               *p++=(unsigned char)
 263                 ((i & 0x01) != 0 ? (byte & 0x0f) : ((byte >> 4) & 0x0f));
 264           }
 265         x+=count;
 266       }
 267     else
 268       {
 269         /*
 270           Escape mode.
 271         */
 272         count=ReadBlobByte(image);
 273         if (count == 0x01)
 274           return(MagickTrue);
 275         switch (count)
 276         {
 277           case 0x00:
 278           {
 279             /*
 280               End of line.
 281             */
 282             x=0;
 283             y++;
 284             p=pixels+y*image->columns;
 285             break;
 286           }
 287           case 0x02:
 288           {
 289             /*
 290               Delta mode.
 291             */
 292             x+=ReadBlobByte(image);
 293             y+=ReadBlobByte(image);
 294             p=pixels+y*image->columns+x;
 295             break;
 296           }
 297           default:
 298           {
 299             /*
 300               Absolute mode.
 301             */
 302             count=MagickMin(count,(int) (q-p));
 303             if (compression == BI_RLE8)
 304               for (i=0; i < count; i++)
 305                 *p++=(unsigned char) ReadBlobByte(image);
 306             else
 307               for (i=0; i < count; i++)
 308               {
 309                 if ((i & 0x01) == 0)
 310                   byte=(unsigned char) ReadBlobByte(image);
 311                 *p++=(unsigned char)
 312                   ((i & 0x01) != 0 ? (byte & 0x0f) : ((byte >> 4) & 0x0f));
 313               }
 314             x+=count;
 315             /*
 316               Read pad byte.
 317             */
 318             if (compression == BI_RLE8)
 319               {
 320                 if ((count & 0x01) != 0)
 321                   (void) ReadBlobByte(image);
 322               }
 323             else
 324               if (((count & 0x03) == 1) || ((count & 0x03) == 2))
 325                 (void) ReadBlobByte(image);
 326             break;
 327           }
 328         }
 329       }
 330     if (SetImageProgress(image,LoadImageTag,y,image->rows) == MagickFalse)
 331       break;
 332   }
 333   (void) ReadBlobByte(image);  /* end of line */
 334   (void) ReadBlobByte(image);
 335   return(MagickTrue);
 336 }
 337 \f
 338 /*
 339 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 340 %                                                                             %
 341 %                                                                             %
 342 %                                                                             %
 343 %   E n c o d e I m a g e                                                     %
 344 %                                                                             %
 345 %                                                                             %
 346 %                                                                             %
 347 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 348 %
 349 %  EncodeImage compresses pixels using a runlength encoded format.
 350 %
 351 %  The format of the EncodeImage method is:
 352 %
 353 %    static MagickBooleanType EncodeImage(Image *image,
 354 %      const size_t bytes_per_line,const unsigned char *pixels,
 355 %      unsigned char *compressed_pixels)
 356 %
 357 %  A description of each parameter follows:
 358 %
 359 %    o image:  The image.
 360 %
 361 %    o bytes_per_line: the number of bytes in a scanline of compressed pixels
 362 %
 363 %    o pixels:  The address of a byte (8 bits) array of pixel data created by
 364 %      the compression process.
 365 %
 366 %    o compressed_pixels:  The address of a byte (8 bits) array of compressed
 367 %      pixel data.
 368 %
 369 */
 370 static size_t EncodeImage(Image *image,const size_t bytes_per_line,
 371   const unsigned char *pixels,unsigned char *compressed_pixels)
 372 {
 373   MagickBooleanType
 374     status;
 375
 376   register const unsigned char
 377     *p;
 378
 379   register ssize_t
 380     i,
 381     x;
 382
 383   register unsigned char
 384     *q;
 385
 386   ssize_t
 387     y;
 388
 389   /*
 390     Runlength encode pixels.
 391   */
 392   assert(image != (Image *) NULL);
 393   assert(image->signature == MagickSignature);
 394   if (image->debug != MagickFalse)
 395     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 396   assert(pixels != (const unsigned char *) NULL);
 397   assert(compressed_pixels != (unsigned char *) NULL);
 398   p=pixels;
 399   q=compressed_pixels;
 400   i=0;
 401   for (y=0; y < (ssize_t) image->rows; y++)
 402   {
 403     for (x=0; x < (ssize_t) bytes_per_line; x+=i)
 404     {
 405       /*
 406         Determine runlength.
 407       */
 408       for (i=1; ((x+i) < (ssize_t) bytes_per_line); i++)
 409         if ((i == 255) || (*(p+i) != *p))
 410           break;
 411       *q++=(unsigned char) i;
 412       *q++=(*p);
 413       p+=i;
 414     }
 415     /*
 416       End of line.
 417     */
 418     *q++=(unsigned char) 0x00;
 419     *q++=(unsigned char) 0x00;
 420     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 421       image->rows);
 422     if (status == MagickFalse)
 423       break;
 424   }
 425   /*
 426     End of bitmap.
 427   */
 428   *q++=(unsigned char) 0x00;
 429   *q++=(unsigned char) 0x01;
 430   return((size_t) (q-compressed_pixels));
 431 }
 432 \f
 433 /*
 434 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 435 %                                                                             %
 436 %                                                                             %
 437 %                                                                             %
 438 %   I s B M P                                                                 %
 439 %                                                                             %
 440 %                                                                             %
 441 %                                                                             %
 442 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 443 %
 444 %  IsBMP() returns MagickTrue if the image format type, identified by the
 445 %  magick string, is BMP.
 446 %
 447 %  The format of the IsBMP method is:
 448 %
 449 %      MagickBooleanType IsBMP(const unsigned char *magick,const size_t length)
 450 %
 451 %  A description of each parameter follows:
 452 %
 453 %    o magick: compare image format pattern against these bytes.
 454 %
 455 %    o length: Specifies the length of the magick string.
 456 %
 457 */
 458 static MagickBooleanType IsBMP(const unsigned char *magick,const size_t length)
 459 {
 460   if (length < 2)
 461     return(MagickFalse);
 462   if ((LocaleNCompare((char *) magick,"BA",2) == 0) ||
 463       (LocaleNCompare((char *) magick,"BM",2) == 0) ||
 464       (LocaleNCompare((char *) magick,"IC",2) == 0) ||
 465       (LocaleNCompare((char *) magick,"PI",2) == 0) ||
 466       (LocaleNCompare((char *) magick,"CI",2) == 0) ||
 467       (LocaleNCompare((char *) magick,"CP",2) == 0))
 468     return(MagickTrue);
 469   return(MagickFalse);
 470 }
 471 \f
 472 /*
 473 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 474 %                                                                             %
 475 %                                                                             %
 476 %                                                                             %
 477 %   R e a d B M P I m a g e                                                   %
 478 %                                                                             %
 479 %                                                                             %
 480 %                                                                             %
 481 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 482 %
 483 %  ReadBMPImage() reads a Microsoft Windows bitmap image file, Version
 484 %  2, 3 (for Windows or NT), or 4, and  returns it.  It allocates the memory
 485 %  necessary for the new Image structure and returns a pointer to the new
 486 %  image.
 487 %
 488 %  The format of the ReadBMPImage method is:
 489 %
 490 %      image=ReadBMPImage(image_info)
 491 %
 492 %  A description of each parameter follows:
 493 %
 494 %    o image_info: the image info.
 495 %
 496 %    o exception: return any errors or warnings in this structure.
 497 %
 498 */
 499
 500 static Image *ReadBMPImage(const ImageInfo *image_info,ExceptionInfo *exception)
 501 {
 502   BMPInfo
 503     bmp_info;
 504
 505   Image
 506     *image;
 507
 508   MagickBooleanType
 509     status;
 510
 511   MagickOffsetType
 512     offset,
 513     start_position;
 514
 515   Quantum
 516     index;
 517
 518   register Quantum
 519     *q;
 520
 521   register ssize_t
 522     i,
 523     x;
 524
 525   register unsigned char
 526     *p;
 527
 528   size_t
 529     bit,
 530     blue,
 531     bytes_per_line,
 532     green,
 533     length,
 534     opacity,
 535     red;
 536
 537   ssize_t
 538     count,
 539     y;
 540
 541   unsigned char
 542     magick[12],
 543     *pixels;
 544
 545   /*
 546     Open image file.
 547   */
 548   assert(image_info != (const ImageInfo *) NULL);
 549   assert(image_info->signature == MagickSignature);
 550   if (image_info->debug != MagickFalse)
 551     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 552       image_info->filename);
 553   assert(exception != (ExceptionInfo *) NULL);
 554   assert(exception->signature == MagickSignature);
 555   image=AcquireImage(image_info,exception);
 556   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 557   if (status == MagickFalse)
 558     {
 559       image=DestroyImageList(image);
 560       return((Image *) NULL);
 561     }
 562   /*
 563     Determine if this a BMP file.
 564   */
 565   (void) ResetMagickMemory(&bmp_info,0,sizeof(bmp_info));
 566   bmp_info.ba_offset=0;
 567   start_position=0;
 568   count=ReadBlob(image,2,magick);
 569   do
 570   {
 571     PixelInfo
 572       quantum_bits;
 573
 574     PixelPacket
 575       shift;
 576
 577     size_t
 578       profile_data,
 579       profile_size;
 580
 581     /*
 582       Verify BMP identifier.
 583     */
 584     if (bmp_info.ba_offset == 0)
 585       start_position=TellBlob(image)-2;
 586     bmp_info.ba_offset=0;
 587     while (LocaleNCompare((char *) magick,"BA",2) == 0)
 588     {
 589       bmp_info.file_size=ReadBlobLSBLong(image);
 590       bmp_info.ba_offset=ReadBlobLSBLong(image);
 591       bmp_info.offset_bits=ReadBlobLSBLong(image);
 592       count=ReadBlob(image,2,magick);
 593       if (count != 2)
 594         break;
 595     }
 596     if (image->debug != MagickFalse)
 597       (void) LogMagickEvent(CoderEvent,GetMagickModule(),"  Magick: %c%c",
 598         magick[0],magick[1]);
 599     if ((count == 0) || ((LocaleNCompare((char *) magick,"BM",2) != 0) &&
 600         (LocaleNCompare((char *) magick,"CI",2) != 0)))
 601       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 602     bmp_info.file_size=ReadBlobLSBLong(image);
 603     (void) ReadBlobLSBLong(image);
 604     bmp_info.offset_bits=ReadBlobLSBLong(image);
 605     bmp_info.size=ReadBlobLSBLong(image);
 606     if (image->debug != MagickFalse)
 607       (void) LogMagickEvent(CoderEvent,GetMagickModule(),"  BMP size: %u",
 608         bmp_info.size);
 609     if (bmp_info.size == 12)
 610       {
 611         /*
 612           OS/2 BMP image file.
 613         */
 614         bmp_info.width=(short) ReadBlobLSBShort(image);
 615         bmp_info.height=(short) ReadBlobLSBShort(image);
 616         bmp_info.planes=ReadBlobLSBShort(image);
 617         bmp_info.bits_per_pixel=ReadBlobLSBShort(image);
 618         bmp_info.x_pixels=0;
 619         bmp_info.y_pixels=0;
 620         bmp_info.number_colors=0;
 621         bmp_info.compression=BI_RGB;
 622         bmp_info.image_size=0;
 623         bmp_info.alpha_mask=0;
 624         if (image->debug != MagickFalse)
 625           {
 626             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 627               "  Format: OS/2 Bitmap");
 628             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 629               "  Geometry: %.20gx%.20g",(double) bmp_info.width,(double)
 630               bmp_info.height);
 631           }
 632       }
 633     else
 634       {
 635         /*
 636           Microsoft Windows BMP image file.
 637         */
 638         if (bmp_info.size < 40)
 639           ThrowReaderException(CorruptImageError,"NonOS2HeaderSizeError");
 640         bmp_info.width=(int) ReadBlobLSBLong(image);
 641         bmp_info.height=(int) ReadBlobLSBLong(image);
 642         bmp_info.planes=ReadBlobLSBShort(image);
 643         bmp_info.bits_per_pixel=ReadBlobLSBShort(image);
 644         bmp_info.compression=ReadBlobLSBLong(image);
 645         bmp_info.image_size=ReadBlobLSBLong(image);
 646         bmp_info.x_pixels=ReadBlobLSBLong(image);
 647         bmp_info.y_pixels=ReadBlobLSBLong(image);
 648         bmp_info.number_colors=ReadBlobLSBLong(image);
 649         bmp_info.colors_important=ReadBlobLSBLong(image);
 650         profile_data=0;
 651         profile_size=0;
 652         if (image->debug != MagickFalse)
 653           {
 654             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 655               "  Format: MS Windows bitmap");
 656             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 657               "  Geometry: %.20gx%.20g",(double) bmp_info.width,(double)
 658               bmp_info.height);
 659             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 660               "  Bits per pixel: %.20g",(double) bmp_info.bits_per_pixel);
 661             switch ((int) bmp_info.compression)
 662             {
 663               case BI_RGB:
 664               {
 665                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 666                   "  Compression: BI_RGB");
 667                 break;
 668               }
 669               case BI_RLE4:
 670               {
 671                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 672                   "  Compression: BI_RLE4");
 673                 break;
 674               }
 675               case BI_RLE8:
 676               {
 677                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 678                   "  Compression: BI_RLE8");
 679                 break;
 680               }
 681               case BI_BITFIELDS:
 682               {
 683                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 684                   "  Compression: BI_BITFIELDS");
 685                 break;
 686               }
 687               case BI_PNG:
 688               {
 689                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 690                   "  Compression: BI_PNG");
 691                 break;
 692               }
 693               case BI_JPEG:
 694               {
 695                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 696                   "  Compression: BI_JPEG");
 697                 break;
 698               }
 699               default:
 700               {
 701                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 702                   "  Compression: UNKNOWN (%u)",bmp_info.compression);
 703               }
 704             }
 705             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 706               "  Number of colors: %u",bmp_info.number_colors);
 707           }
 708         bmp_info.red_mask=ReadBlobLSBLong(image);
 709         bmp_info.green_mask=ReadBlobLSBLong(image);
 710         bmp_info.blue_mask=ReadBlobLSBLong(image);
 711         if (bmp_info.size > 40)
 712           {
 713             double
 714               sum;
 715
 716             /*
 717               Read color management information.
 718             */
 719             bmp_info.alpha_mask=ReadBlobLSBLong(image);
 720             bmp_info.colorspace=(int) ReadBlobLSBLong(image);
 721             /*
 722               Decode 2^30 fixed point formatted CIE primaries.
 723             */
 724             bmp_info.red_primary.x=(double) ReadBlobLSBLong(image)/0x3ffffff;
 725             bmp_info.red_primary.y=(double) ReadBlobLSBLong(image)/0x3ffffff;
 726             bmp_info.red_primary.z=(double) ReadBlobLSBLong(image)/0x3ffffff;
 727             bmp_info.green_primary.x=(double) ReadBlobLSBLong(image)/0x3ffffff;
 728             bmp_info.green_primary.y=(double) ReadBlobLSBLong(image)/0x3ffffff;
 729             bmp_info.green_primary.z=(double) ReadBlobLSBLong(image)/0x3ffffff;
 730             bmp_info.blue_primary.x=(double) ReadBlobLSBLong(image)/0x3ffffff;
 731             bmp_info.blue_primary.y=(double) ReadBlobLSBLong(image)/0x3ffffff;
 732             bmp_info.blue_primary.z=(double) ReadBlobLSBLong(image)/0x3ffffff;
 733             sum=bmp_info.red_primary.x+bmp_info.red_primary.y+
 734               bmp_info.red_primary.z;
 735             image->chromaticity.red_primary.x/=sum;
 736             image->chromaticity.red_primary.y/=sum;
 737             sum=bmp_info.green_primary.x+bmp_info.green_primary.y+
 738               bmp_info.green_primary.z;
 739             image->chromaticity.green_primary.x/=sum;
 740             image->chromaticity.green_primary.y/=sum;
 741             sum=bmp_info.blue_primary.x+bmp_info.blue_primary.y+
 742               bmp_info.blue_primary.z;
 743             image->chromaticity.blue_primary.x/=sum;
 744             image->chromaticity.blue_primary.y/=sum;
 745             /*
 746               Decode 16^16 fixed point formatted gamma_scales.
 747             */
 748             bmp_info.gamma_scale.x=(double) ReadBlobLSBLong(image)/0xffff;
 749             bmp_info.gamma_scale.y=(double) ReadBlobLSBLong(image)/0xffff;
 750             bmp_info.gamma_scale.z=(double) ReadBlobLSBLong(image)/0xffff;
 751             /*
 752               Compute a single gamma from the BMP 3-channel gamma.
 753             */
 754             image->gamma=(bmp_info.gamma_scale.x+bmp_info.gamma_scale.y+
 755               bmp_info.gamma_scale.z)/3.0;
 756           }
 757         if (bmp_info.size > 108)
 758           {
 759             size_t
 760               intent;
 761
 762             /*
 763               Read BMP Version 5 color management information.
 764             */
 765             intent=ReadBlobLSBLong(image);
 766             switch ((int) intent)
 767             {
 768               case LCS_GM_BUSINESS:
 769               {
 770                 image->rendering_intent=SaturationIntent;
 771                 break;
 772               }
 773               case LCS_GM_GRAPHICS:
 774               {
 775                 image->rendering_intent=RelativeIntent;
 776                 break;
 777               }
 778               case LCS_GM_IMAGES:
 779               {
 780                 image->rendering_intent=PerceptualIntent;
 781                 break;
 782               }
 783               case LCS_GM_ABS_COLORIMETRIC:
 784               {
 785                 image->rendering_intent=AbsoluteIntent;
 786                 break;
 787               }
 788             }
 789             profile_data=ReadBlobLSBLong(image);
 790             profile_size=ReadBlobLSBLong(image);
 791             (void) profile_data;
 792             (void) profile_size;
 793             (void) ReadBlobLSBLong(image);  /* Reserved byte */
 794           }
 795       }
 796     if ((MagickSizeType) bmp_info.file_size > GetBlobSize(image))
 797       (void) ThrowMagickException(exception,GetMagickModule(),CorruptImageError,
 798         "LengthAndFilesizeDoNotMatch","`%s'",image->filename);
 799     else
 800       if ((MagickSizeType) bmp_info.file_size < GetBlobSize(image))
 801         (void) ThrowMagickException(exception,GetMagickModule(),
 802           CorruptImageWarning,"LengthAndFilesizeDoNotMatch","`%s'",
 803           image->filename);
 804     if (bmp_info.width <= 0)
 805       ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
 806     if (bmp_info.height == 0)
 807       ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
 808     if (bmp_info.planes != 1)
 809       ThrowReaderException(CorruptImageError,"StaticPlanesValueNotEqualToOne");
 810     if ((bmp_info.bits_per_pixel != 1) && (bmp_info.bits_per_pixel != 4) &&
 811         (bmp_info.bits_per_pixel != 8) && (bmp_info.bits_per_pixel != 16) &&
 812         (bmp_info.bits_per_pixel != 24) && (bmp_info.bits_per_pixel != 32))
 813       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 814     if (bmp_info.number_colors > (1U << bmp_info.bits_per_pixel))
 815       {
 816         if (bmp_info.bits_per_pixel < 24)
 817           ThrowReaderException(CorruptImageError,"UnrecognizedNumberOfColors");
 818         bmp_info.number_colors=0;
 819       }
 820     if ((bmp_info.compression == 1) && (bmp_info.bits_per_pixel != 8))
 821       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 822     if ((bmp_info.compression == 2) && (bmp_info.bits_per_pixel != 4))
 823       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 824     if ((bmp_info.compression == 3) && (bmp_info.bits_per_pixel < 16))
 825       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 826     switch (bmp_info.compression)
 827     {
 828       case BI_RGB:
 829       case BI_RLE8:
 830       case BI_RLE4:
 831       case BI_BITFIELDS:
 832         break;
 833       case BI_JPEG:
 834         ThrowReaderException(CoderError,"JPEGCompressNotSupported");
 835       case BI_PNG:
 836         ThrowReaderException(CoderError,"PNGCompressNotSupported");
 837       default:
 838         ThrowReaderException(CorruptImageError,"UnrecognizedImageCompression");
 839     }
 840     image->columns=(size_t) MagickAbsoluteValue(bmp_info.width);
 841     image->rows=(size_t) MagickAbsoluteValue(bmp_info.height);
 842     image->depth=bmp_info.bits_per_pixel <= 8 ? bmp_info.bits_per_pixel : 8;
 843     if ((bmp_info.bits_per_pixel == 16) || (bmp_info.bits_per_pixel == 32))
 844       image->matte=bmp_info.alpha_mask != 0 ? MagickTrue : MagickFalse;
 845     if ((bmp_info.number_colors != 0) || (bmp_info.bits_per_pixel < 16))
 846       {
 847         size_t
 848           one;
 849
 850         image->storage_class=PseudoClass;
 851         image->colors=bmp_info.number_colors;
 852         one=1;
 853         if (image->colors == 0)
 854           image->colors=one << bmp_info.bits_per_pixel;
 855       }
 856     if (image->storage_class == PseudoClass)
 857       {
 858         unsigned char
 859           *bmp_colormap;
 860
 861         size_t
 862           packet_size;
 863
 864         /*
 865           Read BMP raster colormap.
 866         */
 867         if (image->debug != MagickFalse)
 868           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 869             "  Reading colormap of %.20g colors",(double) image->colors);
 870         if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 871           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 872         bmp_colormap=(unsigned char *) AcquireQuantumMemory((size_t)
 873           image->colors,4*sizeof(*bmp_colormap));
 874         if (bmp_colormap == (unsigned char *) NULL)
 875           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 876         if ((bmp_info.size == 12) || (bmp_info.size == 64))
 877           packet_size=3;
 878         else
 879           packet_size=4;
 880         offset=SeekBlob(image,start_position+14+bmp_info.size,SEEK_SET);
 881         if (offset < 0)
 882           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 883         count=ReadBlob(image,packet_size*image->colors,bmp_colormap);
 884         if (count != (ssize_t) (packet_size*image->colors))
 885           ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
 886         p=bmp_colormap;
 887         for (i=0; i < (ssize_t) image->colors; i++)
 888         {
 889           image->colormap[i].blue=ScaleCharToQuantum(*p++);
 890           image->colormap[i].green=ScaleCharToQuantum(*p++);
 891           image->colormap[i].red=ScaleCharToQuantum(*p++);
 892           if (packet_size == 4)
 893             p++;
 894         }
 895         bmp_colormap=(unsigned char *) RelinquishMagickMemory(bmp_colormap);
 896       }
 897     image->resolution.x=(double) bmp_info.x_pixels/100.0;
 898     image->resolution.y=(double) bmp_info.y_pixels/100.0;
 899     image->units=PixelsPerCentimeterResolution;
 900     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 901       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 902         break;
 903     /*
 904       Read image data.
 905     */
 906     if ((start_position+bmp_info.offset_bits) > TellBlob(image))
 907       {
 908         offset=SeekBlob(image,start_position+bmp_info.offset_bits,SEEK_SET);
 909         if (offset < 0)
 910           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 911       }
 912     if (bmp_info.compression == BI_RLE4)
 913       bmp_info.bits_per_pixel<<=1;
 914     bytes_per_line=4*((image->columns*bmp_info.bits_per_pixel+31)/32);
 915     length=(size_t) bytes_per_line*image->rows;
 916     pixels=(unsigned char *) AcquireQuantumMemory((size_t) image->rows,
 917       MagickMax(bytes_per_line,image->columns+256UL)*sizeof(*pixels));
 918     if (pixels == (unsigned char *) NULL)
 919       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 920     if ((bmp_info.compression == BI_RGB) ||
 921         (bmp_info.compression == BI_BITFIELDS))
 922       {
 923         if (image->debug != MagickFalse)
 924           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 925             "  Reading pixels (%.20g bytes)",(double) length);
 926         count=ReadBlob(image,length,pixels);
 927         if (count != (ssize_t) length)
 928           {
 929             pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 930             ThrowReaderException(CorruptImageError,
 931               "InsufficientImageDataInFile");
 932           }
 933       }
 934     else
 935       {
 936         /*
 937           Convert run-length encoded raster pixels.
 938         */
 939         status=DecodeImage(image,bmp_info.compression,pixels);
 940         if (status == MagickFalse)
 941           {
 942             pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 943             ThrowReaderException(CorruptImageError,
 944               "UnableToRunlengthDecodeImage");
 945           }
 946       }
 947     /*
 948       Convert BMP raster image to pixel packets.
 949     */
 950     if (bmp_info.compression == BI_RGB)
 951       {
 952         bmp_info.alpha_mask=0;
 953         bmp_info.red_mask=0x00ff0000U;
 954         bmp_info.green_mask=0x0000ff00U;
 955         bmp_info.blue_mask=0x000000ffU;
 956         if (bmp_info.bits_per_pixel == 16)
 957           {
 958             /*
 959               RGB555.
 960             */
 961             bmp_info.red_mask=0x00007c00U;
 962             bmp_info.green_mask=0x000003e0U;
 963             bmp_info.blue_mask=0x0000001fU;
 964           }
 965       }
 966     if ((bmp_info.bits_per_pixel == 16) || (bmp_info.bits_per_pixel == 32))
 967       {
 968         register size_t
 969           sample;
 970
 971         /*
 972           Get shift and quantum bits info from bitfield masks.
 973         */
 974         (void) ResetMagickMemory(&shift,0,sizeof(shift));
 975         (void) ResetMagickMemory(&quantum_bits,0,sizeof(quantum_bits));
 976         if (bmp_info.red_mask != 0)
 977           while (((bmp_info.red_mask << shift.red) & 0x80000000UL) == 0)
 978             shift.red++;
 979         if (bmp_info.green_mask != 0)
 980           while (((bmp_info.green_mask << shift.green) & 0x80000000UL) == 0)
 981             shift.green++;
 982         if (bmp_info.blue_mask != 0)
 983           while (((bmp_info.blue_mask << shift.blue) & 0x80000000UL) == 0)
 984             shift.blue++;
 985         if (bmp_info.alpha_mask != 0)
 986           while (((bmp_info.alpha_mask << shift.alpha) & 0x80000000UL) == 0)
 987             shift.alpha++;
 988         sample=shift.red;
 989         while (((bmp_info.red_mask << sample) & 0x80000000UL) != 0)
 990           sample++;
 991         quantum_bits.red=(Quantum) (sample-shift.red);
 992         sample=shift.green;
 993         while (((bmp_info.green_mask << sample) & 0x80000000UL) != 0)
 994           sample++;
 995         quantum_bits.green=(Quantum) (sample-shift.green);
 996         sample=shift.blue;
 997         while (((bmp_info.blue_mask << sample) & 0x80000000UL) != 0)
 998           sample++;
 999         quantum_bits.blue=(Quantum) (sample-shift.blue);
1000         sample=shift.alpha;
1001         while (((bmp_info.alpha_mask << sample) & 0x80000000UL) != 0)
1002           sample++;
1003         quantum_bits.alpha=(Quantum) (sample-shift.alpha);
1004       }
1005     switch (bmp_info.bits_per_pixel)
1006     {
1007       case 1:
1008       {
1009         /*
1010           Convert bitmap scanline.
1011         */
1012         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1013         {
1014           p=pixels+(image->rows-y-1)*bytes_per_line;
1015           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1016           if (q == (Quantum *) NULL)
1017             break;
1018           for (x=0; x < ((ssize_t) image->columns-7); x+=8)
1019           {
1020             for (bit=0; bit < 8; bit++)
1021             {
1022               index=(Quantum) (((*p) & (0x80 >> bit)) != 0 ? 0x01 : 0x00);
1023               SetPixelIndex(image,index,q);
1024               q+=GetPixelChannels(image);
1025             }
1026             p++;
1027           }
1028           if ((image->columns % 8) != 0)
1029             {
1030               for (bit=0; bit < (image->columns % 8); bit++)
1031               {
1032                 index=(Quantum) (((*p) & (0x80 >> bit)) != 0 ? 0x01 : 0x00);
1033                 SetPixelIndex(image,index,q);
1034                 q+=GetPixelChannels(image);
1035               }
1036               p++;
1037             }
1038           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1039             break;
1040           if (image->previous == (Image *) NULL)
1041             {
1042               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
1043                 image->rows);
1044               if (status == MagickFalse)
1045                 break;
1046             }
1047         }
1048         (void) SyncImage(image,exception);
1049         break;
1050       }
1051       case 4:
1052       {
1053         /*
1054           Convert PseudoColor scanline.
1055         */
1056         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1057         {
1058           p=pixels+(image->rows-y-1)*bytes_per_line;
1059           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1060           if (q == (Quantum *) NULL)
1061             break;
1062           for (x=0; x < ((ssize_t) image->columns-1); x+=2)
1063           {
1064             index=ConstrainColormapIndex(image,(*p >> 4) & 0x0f,exception);
1065             SetPixelIndex(image,index,q);
1066             q+=GetPixelChannels(image);
1067             index=ConstrainColormapIndex(image,*p & 0x0f,exception);
1068             SetPixelIndex(image,index,q);
1069             q+=GetPixelChannels(image);
1070             p++;
1071           }
1072           if ((image->columns % 2) != 0)
1073             {
1074               index=ConstrainColormapIndex(image,(*p >> 4) & 0xf,exception);
1075               SetPixelIndex(image,index,q);
1076               q+=GetPixelChannels(image);
1077               p++;
1078             }
1079           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1080             break;
1081           if (image->previous == (Image *) NULL)
1082             {
1083               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
1084                 image->rows);
1085               if (status == MagickFalse)
1086                 break;
1087             }
1088         }
1089         (void) SyncImage(image,exception);
1090         break;
1091       }
1092       case 8:
1093       {
1094         /*
1095           Convert PseudoColor scanline.
1096         */
1097         if ((bmp_info.compression == BI_RLE8) ||
1098             (bmp_info.compression == BI_RLE4))
1099           bytes_per_line=image->columns;
1100         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1101         {
1102           p=pixels+(image->rows-y-1)*bytes_per_line;
1103           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1104           if (q == (Quantum *) NULL)
1105             break;
1106           for (x = (ssize_t)image->columns; x != 0; --x)
1107           {
1108             index=ConstrainColormapIndex(image,*p++,exception);
1109             SetPixelIndex(image,index,q);
1110             q+=GetPixelChannels(image);
1111           }
1112           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1113             break;
1114           offset=(MagickOffsetType) (image->rows-y-1);
1115           if (image->previous == (Image *) NULL)
1116             {
1117               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
1118                 image->rows);
1119               if (status == MagickFalse)
1120                 break;
1121             }
1122         }
1123         (void) SyncImage(image,exception);
1124         break;
1125       }
1126       case 16:
1127       {
1128         size_t
1129           pixel;
1130
1131         /*
1132           Convert bitfield encoded 16-bit PseudoColor scanline.
1133         */
1134         if (bmp_info.compression != BI_RGB &&
1135             bmp_info.compression != BI_BITFIELDS)
1136           {
1137             pixels=(unsigned char *) RelinquishMagickMemory(pixels);
1138             ThrowReaderException(CorruptImageError,
1139               "UnrecognizedImageCompression");
1140           }
1141         bytes_per_line=2*(image->columns+image->columns % 2);
1142         image->storage_class=DirectClass;
1143         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1144         {
1145           p=pixels+(image->rows-y-1)*bytes_per_line;
1146           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1147           if (q == (Quantum *) NULL)
1148             break;
1149           for (x=0; x < (ssize_t) image->columns; x++)
1150           {
1151             pixel=(size_t) (*p++);
1152             pixel|=(*p++) << 8;
1153             red=((pixel & bmp_info.red_mask) << shift.red) >> 16;
1154             if (quantum_bits.red == 5)
1155               red|=((red & 0xe000) >> 5);
1156             if (quantum_bits.red <= 8)
1157               red|=((red & 0xff00) >> 8);
1158             green=((pixel & bmp_info.green_mask) << shift.green) >> 16;
1159             if (quantum_bits.green == 5)
1160               green|=((green & 0xe000) >> 5);
1161             if (quantum_bits.green == 6)
1162               green|=((green & 0xc000) >> 6);
1163             if (quantum_bits.green <= 8)
1164               green|=((green & 0xff00) >> 8);
1165             blue=((pixel & bmp_info.blue_mask) << shift.blue) >> 16;
1166             if (quantum_bits.blue == 5)
1167               blue|=((blue & 0xe000) >> 5);
1168             if (quantum_bits.blue <= 8)
1169               blue|=((blue & 0xff00) >> 8);
1170             opacity=((pixel & bmp_info.alpha_mask) << shift.alpha) >> 16;
1171             if (quantum_bits.alpha <= 8)
1172               opacity|=((opacity & 0xff00) >> 8);
1173             SetPixelRed(image,ScaleShortToQuantum((unsigned short) red),q);
1174             SetPixelGreen(image,ScaleShortToQuantum((unsigned short) green),q);
1175             SetPixelBlue(image,ScaleShortToQuantum((unsigned short) blue),q);
1176             SetPixelAlpha(image,OpaqueAlpha,q);
1177             if (image->matte != MagickFalse)
1178               SetPixelAlpha(image,
1179                 ScaleShortToQuantum((unsigned short) opacity),q);
1180             q+=GetPixelChannels(image);
1181           }
1182           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1183             break;
1184           offset=(MagickOffsetType) (image->rows-y-1);
1185           if (image->previous == (Image *) NULL)
1186             {
1187               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
1188                 image->rows);
1189               if (status == MagickFalse)
1190                 break;
1191             }
1192         }
1193         break;
1194       }
1195       case 24:
1196       {
1197         /*
1198           Convert DirectColor scanline.
1199         */
1200         bytes_per_line=4*((image->columns*24+31)/32);
1201         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1202         {
1203           p=pixels+(image->rows-y-1)*bytes_per_line;
1204           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1205           if (q == (Quantum *) NULL)
1206             break;
1207           for (x=0; x < (ssize_t) image->columns; x++)
1208           {
1209             SetPixelBlue(image,ScaleCharToQuantum(*p++),q);
1210             SetPixelGreen(image,ScaleCharToQuantum(*p++),q);
1211             SetPixelRed(image,ScaleCharToQuantum(*p++),q);
1212             SetPixelAlpha(image,OpaqueAlpha,q);
1213             q+=GetPixelChannels(image);
1214           }
1215           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1216             break;
1217           offset=(MagickOffsetType) (image->rows-y-1);
1218           if (image->previous == (Image *) NULL)
1219             {
1220               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
1221                 image->rows);
1222               if (status == MagickFalse)
1223                 break;
1224             }
1225         }
1226         break;
1227       }
1228       case 32:
1229       {
1230         /*
1231           Convert bitfield encoded DirectColor scanline.
1232         */
1233         if ((bmp_info.compression != BI_RGB) &&
1234             (bmp_info.compression != BI_BITFIELDS))
1235           {
1236             pixels=(unsigned char *) RelinquishMagickMemory(pixels);
1237             ThrowReaderException(CorruptImageError,
1238               "UnrecognizedImageCompression");
1239           }
1240         bytes_per_line=4*(image->columns);
1241         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1242         {
1243           size_t
1244             pixel;
1245
1246           p=pixels+(image->rows-y-1)*bytes_per_line;
1247           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1248           if (q == (Quantum *) NULL)
1249             break;
1250           for (x=0; x < (ssize_t) image->columns; x++)
1251           {
1252             pixel=(size_t) (*p++);
1253             pixel|=(*p++ << 8);
1254             pixel|=(*p++ << 16);
1255             pixel|=(*p++ << 24);
1256             red=((pixel & bmp_info.red_mask) << shift.red) >> 16;
1257             if (quantum_bits.red == 8)
1258               red|=(red >> 8);
1259             green=((pixel & bmp_info.green_mask) << shift.green) >> 16;
1260             if (quantum_bits.green == 8)
1261               green|=(green >> 8);
1262             blue=((pixel & bmp_info.blue_mask) << shift.blue) >> 16;
1263             if (quantum_bits.blue == 8)
1264               blue|=(blue >> 8);
1265             opacity=((pixel & bmp_info.alpha_mask) << shift.alpha) >> 16;
1266             if (quantum_bits.alpha == 8)
1267               opacity|=(opacity >> 8);
1268             SetPixelRed(image,ScaleShortToQuantum((unsigned short) red),q);
1269             SetPixelGreen(image,ScaleShortToQuantum((unsigned short) green),q);
1270             SetPixelBlue(image,ScaleShortToQuantum((unsigned short) blue),q);
1271             SetPixelAlpha(image,OpaqueAlpha,q);
1272             if (image->matte != MagickFalse)
1273               SetPixelAlpha(image,
1274                 ScaleShortToQuantum((unsigned short) opacity),q);
1275             q+=GetPixelChannels(image);
1276           }
1277           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1278             break;
1279           offset=(MagickOffsetType) (image->rows-y-1);
1280           if (image->previous == (Image *) NULL)
1281             {
1282               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
1283                 image->rows);
1284               if (status == MagickFalse)
1285                 break;
1286             }
1287         }
1288         break;
1289       }
1290       default:
1291       {
1292         pixels=(unsigned char *) RelinquishMagickMemory(pixels);
1293         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1294       }
1295     }
1296     pixels=(unsigned char *) RelinquishMagickMemory(pixels);
1297     if (EOFBlob(image) != MagickFalse)
1298       {
1299         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
1300           image->filename);
1301         break;
1302       }
1303     if (bmp_info.height < 0)
1304       {
1305         Image
1306           *flipped_image;
1307
1308         /*
1309           Correct image orientation.
1310         */
1311         flipped_image=FlipImage(image,exception);
1312         if (flipped_image != (Image *) NULL)
1313           {
1314             DuplicateBlob(flipped_image,image);
1315             image=DestroyImage(image);
1316             image=flipped_image;
1317           }
1318       }
1319     /*
1320       Proceed to next image.
1321     */
1322     if (image_info->number_scenes != 0)
1323       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
1324         break;
1325     *magick='\0';
1326     if (bmp_info.ba_offset != 0)
1327       {
1328         offset=SeekBlob(image,(MagickOffsetType) bmp_info.ba_offset,SEEK_SET);
1329         if (offset < 0)
1330           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1331       }
1332     count=ReadBlob(image,2,magick);
1333     if ((count == 2) && (IsBMP(magick,2) != MagickFalse))
1334       {
1335         /*
1336           Acquire next image structure.
1337         */
1338         AcquireNextImage(image_info,image,exception);
1339         if (GetNextImageInList(image) == (Image *) NULL)
1340           {
1341             image=DestroyImageList(image);
1342             return((Image *) NULL);
1343           }
1344         image=SyncNextImageInList(image);
1345         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
1346           GetBlobSize(image));
1347         if (status == MagickFalse)
1348           break;
1349       }
1350   } while (IsBMP(magick,2) != MagickFalse);
1351   (void) CloseBlob(image);
1352   return(GetFirstImageInList(image));
1353 }
1354 \f
1355 /*
1356 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1357 %                                                                             %
1358 %                                                                             %
1359 %                                                                             %
1360 %   R e g i s t e r B M P I m a g e                                           %
1361 %                                                                             %
1362 %                                                                             %
1363 %                                                                             %
1364 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1365 %
1366 %  RegisterBMPImage() adds attributes for the BMP image format to
1367 %  the list of supported formats.  The attributes include the image format
1368 %  tag, a method to read and/or write the format, whether the format
1369 %  supports the saving of more than one frame to the same file or blob,
1370 %  whether the format supports native in-memory I/O, and a brief
1371 %  description of the format.
1372 %
1373 %  The format of the RegisterBMPImage method is:
1374 %
1375 %      size_t RegisterBMPImage(void)
1376 %
1377 */
1378 ModuleExport size_t RegisterBMPImage(void)
1379 {
1380   MagickInfo
1381     *entry;
1382
1383   entry=SetMagickInfo("BMP");
1384   entry->decoder=(DecodeImageHandler *) ReadBMPImage;
1385   entry->encoder=(EncodeImageHandler *) WriteBMPImage;
1386   entry->magick=(IsImageFormatHandler *) IsBMP;
1387   entry->description=ConstantString("Microsoft Windows bitmap image");
1388   entry->module=ConstantString("BMP");
1389   entry->adjoin=MagickFalse;
1390   entry->seekable_stream=MagickTrue;
1391   (void) RegisterMagickInfo(entry);
1392   entry=SetMagickInfo("BMP2");
1393   entry->encoder=(EncodeImageHandler *) WriteBMPImage;
1394   entry->magick=(IsImageFormatHandler *) IsBMP;
1395   entry->description=ConstantString("Microsoft Windows bitmap image (V2)");
1396   entry->module=ConstantString("BMP");
1397   entry->adjoin=MagickFalse;
1398   entry->seekable_stream=MagickTrue;
1399   (void) RegisterMagickInfo(entry);
1400   entry=SetMagickInfo("BMP3");
1401   entry->encoder=(EncodeImageHandler *) WriteBMPImage;
1402   entry->magick=(IsImageFormatHandler *) IsBMP;
1403   entry->description=ConstantString("Microsoft Windows bitmap image (V3)");
1404   entry->module=ConstantString("BMP");
1405   entry->adjoin=MagickFalse;
1406   entry->seekable_stream=MagickTrue;
1407   (void) RegisterMagickInfo(entry);
1408   return(MagickImageCoderSignature);
1409 }
1410 \f
1411 /*
1412 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1413 %                                                                             %
1414 %                                                                             %
1415 %                                                                             %
1416 %   U n r e g i s t e r B M P I m a g e                                       %
1417 %                                                                             %
1418 %                                                                             %
1419 %                                                                             %
1420 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1421 %
1422 %  UnregisterBMPImage() removes format registrations made by the
1423 %  BMP module from the list of supported formats.
1424 %
1425 %  The format of the UnregisterBMPImage method is:
1426 %
1427 %      UnregisterBMPImage(void)
1428 %
1429 */
1430 ModuleExport void UnregisterBMPImage(void)
1431 {
1432   (void) UnregisterMagickInfo("BMP");
1433   (void) UnregisterMagickInfo("BMP2");
1434   (void) UnregisterMagickInfo("BMP3");
1435 }
1436 \f
1437 /*
1438 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1439 %                                                                             %
1440 %                                                                             %
1441 %                                                                             %
1442 %   W r i t e B M P I m a g e                                                 %
1443 %                                                                             %
1444 %                                                                             %
1445 %                                                                             %
1446 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1447 %
1448 %  WriteBMPImage() writes an image in Microsoft Windows bitmap encoded
1449 %  image format, version 3 for Windows or (if the image has a matte channel)
1450 %  version 4.
1451 %
1452 %  The format of the WriteBMPImage method is:
1453 %
1454 %      MagickBooleanType WriteBMPImage(const ImageInfo *image_info,
1455 %        Image *image,ExceptionInfo *exception)
1456 %
1457 %  A description of each parameter follows.
1458 %
1459 %    o image_info: the image info.
1460 %
1461 %    o image:  The image.
1462 %
1463 %    o exception: return any errors or warnings in this structure.
1464 %
1465 */
1466 static MagickBooleanType WriteBMPImage(const ImageInfo *image_info,Image *image,
1467   ExceptionInfo *exception)
1468 {
1469   BMPInfo
1470     bmp_info;
1471
1472   const StringInfo
1473     *profile;
1474
1475   MagickBooleanType
1476     have_color_info,
1477     status;
1478
1479   MagickOffsetType
1480     scene;
1481
1482   register const Quantum
1483     *p;
1484
1485   register ssize_t
1486     i,
1487     x;
1488
1489   register unsigned char
1490     *q;
1491
1492   size_t
1493     bytes_per_line,
1494     type;
1495
1496   ssize_t
1497     y;
1498
1499   unsigned char
1500     *bmp_data,
1501     *pixels;
1502
1503   /*
1504     Open output image file.
1505   */
1506   assert(image_info != (const ImageInfo *) NULL);
1507   assert(image_info->signature == MagickSignature);
1508   assert(image != (Image *) NULL);
1509   assert(image->signature == MagickSignature);
1510   if (image->debug != MagickFalse)
1511     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1512   assert(exception != (ExceptionInfo *) NULL);
1513   assert(exception->signature == MagickSignature);
1514   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
1515   if (status == MagickFalse)
1516     return(status);
1517   type=4;
1518   if (LocaleCompare(image_info->magick,"BMP2") == 0)
1519     type=2;
1520   else
1521     if (LocaleCompare(image_info->magick,"BMP3") == 0)
1522       type=3;
1523   scene=0;
1524   do
1525   {
1526     /*
1527       Initialize BMP raster file header.
1528     */
1529     if (IsRGBColorspace(image->colorspace) == MagickFalse)
1530       (void) TransformImageColorspace(image,sRGBColorspace,exception);
1531     (void) ResetMagickMemory(&bmp_info,0,sizeof(bmp_info));
1532     bmp_info.file_size=14+12;
1533     if (type > 2)
1534       bmp_info.file_size+=28;
1535     bmp_info.offset_bits=bmp_info.file_size;
1536     bmp_info.compression=BI_RGB;
1537     if ((image->storage_class == PseudoClass) && (image->colors > 256))
1538       (void) SetImageStorageClass(image,DirectClass,exception);
1539     if (image->storage_class != DirectClass)
1540       {
1541         /*
1542           Colormapped BMP raster.
1543         */
1544         bmp_info.bits_per_pixel=8;
1545         if (image->colors <= 2)
1546           bmp_info.bits_per_pixel=1;
1547         else
1548           if (image->colors <= 16)
1549             bmp_info.bits_per_pixel=4;
1550           else
1551             if (image->colors <= 256)
1552               bmp_info.bits_per_pixel=8;
1553         if (image_info->compression == RLECompression)
1554           bmp_info.bits_per_pixel=8;
1555         bmp_info.number_colors=1U << bmp_info.bits_per_pixel;
1556         if (image->matte != MagickFalse)
1557           (void) SetImageStorageClass(image,DirectClass,exception);
1558         else
1559           if ((size_t) bmp_info.number_colors < image->colors)
1560             (void) SetImageStorageClass(image,DirectClass,exception);
1561           else
1562             {
1563               bmp_info.file_size+=3*(1UL << bmp_info.bits_per_pixel);
1564               bmp_info.offset_bits+=3*(1UL << bmp_info.bits_per_pixel);
1565               if (type > 2)
1566                 {
1567                   bmp_info.file_size+=(1UL << bmp_info.bits_per_pixel);
1568                   bmp_info.offset_bits+=(1UL << bmp_info.bits_per_pixel);
1569                 }
1570             }
1571       }
1572     if (image->storage_class == DirectClass)
1573       {
1574         /*
1575           Full color BMP raster.
1576         */
1577         bmp_info.number_colors=0;
1578         bmp_info.bits_per_pixel=(unsigned short)
1579           ((type > 3) && (image->matte != MagickFalse) ? 32 : 24);
1580         bmp_info.compression=(unsigned int) ((type > 3) &&
1581           (image->matte != MagickFalse) ?  BI_BITFIELDS : BI_RGB);
1582       }
1583     bytes_per_line=4*((image->columns*bmp_info.bits_per_pixel+31)/32);
1584     bmp_info.ba_offset=0;
1585     profile=GetImageProfile(image,"icc");
1586     have_color_info=(image->rendering_intent != UndefinedIntent) ||
1587       (profile != (StringInfo *) NULL) || (image->gamma != 0.0) ?  MagickTrue :
1588       MagickFalse;
1589     if (type == 2)
1590       bmp_info.size=12;
1591     else
1592       if ((type == 3) || ((image->matte == MagickFalse) &&
1593           (have_color_info == MagickFalse)))
1594         {
1595           type=3;
1596           bmp_info.size=40;
1597         }
1598       else
1599         {
1600           int
1601             extra_size;
1602
1603           bmp_info.size=108;
1604           extra_size=68;
1605           if ((image->rendering_intent != UndefinedIntent) ||
1606               (profile != (StringInfo *) NULL))
1607             {
1608               bmp_info.size=124;
1609               extra_size+=16;
1610             }
1611           bmp_info.file_size+=extra_size;
1612           bmp_info.offset_bits+=extra_size;
1613         }
1614     bmp_info.width=(ssize_t) image->columns;
1615     bmp_info.height=(ssize_t) image->rows;
1616     bmp_info.planes=1;
1617     bmp_info.image_size=(unsigned int) (bytes_per_line*image->rows);
1618     bmp_info.file_size+=bmp_info.image_size;
1619     bmp_info.x_pixels=75*39;
1620     bmp_info.y_pixels=75*39;
1621     switch (image->units)
1622     {
1623       case UndefinedResolution:
1624       case PixelsPerInchResolution:
1625       {
1626         bmp_info.x_pixels=(unsigned int) (100.0*image->resolution.x/2.54);
1627         bmp_info.y_pixels=(unsigned int) (100.0*image->resolution.y/2.54);
1628         break;
1629       }
1630       case PixelsPerCentimeterResolution:
1631       {
1632         bmp_info.x_pixels=(unsigned int) (100.0*image->resolution.x);
1633         bmp_info.y_pixels=(unsigned int) (100.0*image->resolution.y);
1634         break;
1635       }
1636     }
1637     bmp_info.colors_important=bmp_info.number_colors;
1638     /*
1639       Convert MIFF to BMP raster pixels.
1640     */
1641     pixels=(unsigned char *) AcquireQuantumMemory((size_t) bmp_info.image_size,
1642       sizeof(*pixels));
1643     if (pixels == (unsigned char *) NULL)
1644       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1645     (void) ResetMagickMemory(pixels,0,(size_t) bmp_info.image_size);
1646     switch (bmp_info.bits_per_pixel)
1647     {
1648       case 1:
1649       {
1650         size_t
1651           bit,
1652           byte;
1653
1654         /*
1655           Convert PseudoClass image to a BMP monochrome image.
1656         */
1657         for (y=0; y < (ssize_t) image->rows; y++)
1658         {
1659           ssize_t
1660             offset;
1661
1662           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1663           if (p == (const Quantum *) NULL)
1664             break;
1665           q=pixels+(image->rows-y-1)*bytes_per_line;
1666           bit=0;
1667           byte=0;
1668           for (x=0; x < (ssize_t) image->columns; x++)
1669           {
1670             byte<<=1;
1671             byte|=GetPixelIndex(image,p) != 0 ? 0x01 : 0x00;
1672             bit++;
1673             if (bit == 8)
1674               {
1675                 *q++=(unsigned char) byte;
1676                 bit=0;
1677                 byte=0;
1678               }
1679              p+=GetPixelChannels(image);
1680            }
1681            if (bit != 0)
1682              {
1683                *q++=(unsigned char) (byte << (8-bit));
1684                x++;
1685              }
1686           offset=(ssize_t) (image->columns+7)/8;
1687           for (x=offset; x < (ssize_t) bytes_per_line; x++)
1688             *q++=0x00;
1689           if (image->previous == (Image *) NULL)
1690             {
1691               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1692                 image->rows);
1693               if (status == MagickFalse)
1694                 break;
1695             }
1696         }
1697         break;
1698       }
1699       case 4:
1700       {
1701         size_t
1702           byte,
1703           nibble,
1704           offset;
1705
1706         /*
1707           Convert PseudoClass image to a BMP monochrome image.
1708         */
1709         for (y=0; y < (ssize_t) image->rows; y++)
1710         {
1711           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1712           if (p == (const Quantum *) NULL)
1713             break;
1714           q=pixels+(image->rows-y-1)*bytes_per_line;
1715           nibble=0;
1716           byte=0;
1717           for (x=0; x < (ssize_t) image->columns; x++)
1718           {
1719             byte<<=4;
1720             byte|=((size_t) GetPixelIndex(image,p) & 0x0f);
1721             nibble++;
1722             if (nibble == 2)
1723               {
1724                 *q++=(unsigned char) byte;
1725                 nibble=0;
1726                 byte=0;
1727               }
1728             p+=GetPixelChannels(image);
1729           }
1730           if (nibble != 0)
1731             {
1732               *q++=(unsigned char) (byte << 4);
1733               x++;
1734             }
1735           offset=(ssize_t) (image->columns+1)/2;
1736           for (x=offset; x < (ssize_t) bytes_per_line; x++)
1737             *q++=0x00;
1738           if (image->previous == (Image *) NULL)
1739             {
1740               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1741                 image->rows);
1742               if (status == MagickFalse)
1743                 break;
1744             }
1745         }
1746         break;
1747       }
1748       case 8:
1749       {
1750         /*
1751           Convert PseudoClass packet to BMP pixel.
1752         */
1753         for (y=0; y < (ssize_t) image->rows; y++)
1754         {
1755           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1756           if (p == (const Quantum *) NULL)
1757             break;
1758           q=pixels+(image->rows-y-1)*bytes_per_line;
1759           for (x=0; x < (ssize_t) image->columns; x++)
1760           {
1761             *q++=(unsigned char) GetPixelIndex(image,p);
1762             p+=GetPixelChannels(image);
1763           }
1764           for ( ; x < (ssize_t) bytes_per_line; x++)
1765             *q++=0x00;
1766           if (image->previous == (Image *) NULL)
1767             {
1768               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1769                 image->rows);
1770               if (status == MagickFalse)
1771                 break;
1772             }
1773         }
1774         break;
1775       }
1776       case 24:
1777       {
1778         /*
1779           Convert DirectClass packet to BMP BGR888.
1780         */
1781         for (y=0; y < (ssize_t) image->rows; y++)
1782         {
1783           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1784           if (p == (const Quantum *) NULL)
1785             break;
1786           q=pixels+(image->rows-y-1)*bytes_per_line;
1787           for (x=0; x < (ssize_t) image->columns; x++)
1788           {
1789             *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1790             *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1791             *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1792             p+=GetPixelChannels(image);
1793           }
1794           for (x=3L*(ssize_t) image->columns; x < (ssize_t) bytes_per_line; x++)
1795             *q++=0x00;
1796           if (image->previous == (Image *) NULL)
1797             {
1798               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1799                 image->rows);
1800               if (status == MagickFalse)
1801                 break;
1802             }
1803         }
1804         break;
1805       }
1806       case 32:
1807       {
1808         /*
1809           Convert DirectClass packet to ARGB8888 pixel.
1810         */
1811         for (y=0; y < (ssize_t) image->rows; y++)
1812         {
1813           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1814           if (p == (const Quantum *) NULL)
1815             break;
1816           q=pixels+(image->rows-y-1)*bytes_per_line;
1817           for (x=0; x < (ssize_t) image->columns; x++)
1818           {
1819             *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1820             *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1821             *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1822             *q++=ScaleQuantumToChar(GetPixelAlpha(image,p));
1823             p+=GetPixelChannels(image);
1824           }
1825           if (image->previous == (Image *) NULL)
1826             {
1827               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1828                 image->rows);
1829               if (status == MagickFalse)
1830                 break;
1831             }
1832         }
1833         break;
1834       }
1835     }
1836     if ((type > 2) && (bmp_info.bits_per_pixel == 8))
1837       if (image_info->compression != NoCompression)
1838         {
1839           size_t
1840             length;
1841
1842           /*
1843             Convert run-length encoded raster pixels.
1844           */
1845           length=(size_t) (2*(bytes_per_line+2)*(image->rows+2)+2);
1846           bmp_data=(unsigned char *) NULL;
1847           if (~length >= bytes_per_line)
1848             bmp_data=(unsigned char *) AcquireQuantumMemory(length+
1849               bytes_per_line,sizeof(*bmp_data));
1850           if (bmp_data == (unsigned char *) NULL)
1851             {
1852               pixels=(unsigned char *) RelinquishMagickMemory(pixels);
1853               ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1854             }
1855           bmp_info.file_size-=bmp_info.image_size;
1856           bmp_info.image_size=(unsigned int) EncodeImage(image,bytes_per_line,
1857             pixels,bmp_data);
1858           bmp_info.file_size+=bmp_info.image_size;
1859           pixels=(unsigned char *) RelinquishMagickMemory(pixels);
1860           pixels=bmp_data;
1861           bmp_info.compression=BI_RLE8;
1862         }
1863     /*
1864       Write BMP for Windows, all versions, 14-byte header.
1865     */
1866     if (image->debug != MagickFalse)
1867       {
1868         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1869           "   Writing BMP version %.20g datastream",(double) type);
1870         if (image->storage_class == DirectClass)
1871           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1872             "   Storage class=DirectClass");
1873         else
1874           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1875             "   Storage class=PseudoClass");
1876         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1877           "   Image depth=%.20g",(double) image->depth);
1878         if (image->matte != MagickFalse)
1879           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1880             "   Matte=True");
1881         else
1882           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1883             "   Matte=MagickFalse");
1884         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1885           "   BMP bits_per_pixel=%.20g",(double) bmp_info.bits_per_pixel);
1886         switch ((int) bmp_info.compression)
1887         {
1888            case BI_RGB:
1889            {
1890              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1891                "   Compression=BI_RGB");
1892              break;
1893            }
1894            case BI_RLE8:
1895            {
1896              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1897                "   Compression=BI_RLE8");
1898              break;
1899            }
1900            case BI_BITFIELDS:
1901            {
1902              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1903                "   Compression=BI_BITFIELDS");
1904              break;
1905            }
1906            default:
1907            {
1908              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1909                "   Compression=UNKNOWN (%u)",bmp_info.compression);
1910              break;
1911            }
1912         }
1913         if (bmp_info.number_colors == 0)
1914           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1915             "   Number_colors=unspecified");
1916         else
1917           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1918             "   Number_colors=%u",bmp_info.number_colors);
1919       }
1920     (void) WriteBlob(image,2,(unsigned char *) "BM");
1921     (void) WriteBlobLSBLong(image,bmp_info.file_size);
1922     (void) WriteBlobLSBLong(image,bmp_info.ba_offset);  /* always 0 */
1923     (void) WriteBlobLSBLong(image,bmp_info.offset_bits);
1924     if (type == 2)
1925       {
1926         /*
1927           Write 12-byte version 2 bitmap header.
1928         */
1929         (void) WriteBlobLSBLong(image,bmp_info.size);
1930         (void) WriteBlobLSBShort(image,(unsigned short) bmp_info.width);
1931         (void) WriteBlobLSBShort(image,(unsigned short) bmp_info.height);
1932         (void) WriteBlobLSBShort(image,bmp_info.planes);
1933         (void) WriteBlobLSBShort(image,bmp_info.bits_per_pixel);
1934       }
1935     else
1936       {
1937         /*
1938           Write 40-byte version 3+ bitmap header.
1939         */
1940         (void) WriteBlobLSBLong(image,bmp_info.size);
1941         (void) WriteBlobLSBLong(image,(unsigned int) bmp_info.width);
1942         (void) WriteBlobLSBLong(image,(unsigned int) bmp_info.height);
1943         (void) WriteBlobLSBShort(image,bmp_info.planes);
1944         (void) WriteBlobLSBShort(image,bmp_info.bits_per_pixel);
1945         (void) WriteBlobLSBLong(image,bmp_info.compression);
1946         (void) WriteBlobLSBLong(image,bmp_info.image_size);
1947         (void) WriteBlobLSBLong(image,bmp_info.x_pixels);
1948         (void) WriteBlobLSBLong(image,bmp_info.y_pixels);
1949         (void) WriteBlobLSBLong(image,bmp_info.number_colors);
1950         (void) WriteBlobLSBLong(image,bmp_info.colors_important);
1951       }
1952     if ((type > 3) && ((image->matte != MagickFalse) ||
1953         (have_color_info != MagickFalse)))
1954       {
1955         /*
1956           Write the rest of the 108-byte BMP Version 4 header.
1957         */
1958         (void) WriteBlobLSBLong(image,0x00ff0000U);  /* Red mask */
1959         (void) WriteBlobLSBLong(image,0x0000ff00U);  /* Green mask */
1960         (void) WriteBlobLSBLong(image,0x000000ffU);  /* Blue mask */
1961         (void) WriteBlobLSBLong(image,0xff000000U);  /* Alpha mask */
1962         (void) WriteBlobLSBLong(image,0x00000001U);  /* CSType==Calib. RGB */
1963         (void) WriteBlobLSBLong(image,(unsigned int)
1964           image->chromaticity.red_primary.x*0x3ffffff);
1965         (void) WriteBlobLSBLong(image,(unsigned int)
1966           image->chromaticity.red_primary.y*0x3ffffff);
1967         (void) WriteBlobLSBLong(image,(unsigned int)
1968           (1.000f-(image->chromaticity.red_primary.x+
1969           image->chromaticity.red_primary.y)*0x3ffffff));
1970         (void) WriteBlobLSBLong(image,(unsigned int)
1971           image->chromaticity.green_primary.x*0x3ffffff);
1972         (void) WriteBlobLSBLong(image,(unsigned int)
1973           image->chromaticity.green_primary.y*0x3ffffff);
1974         (void) WriteBlobLSBLong(image,(unsigned int)
1975           (1.000f-(image->chromaticity.green_primary.x+
1976           image->chromaticity.green_primary.y)*0x3ffffff));
1977         (void) WriteBlobLSBLong(image,(unsigned int)
1978           image->chromaticity.blue_primary.x*0x3ffffff);
1979         (void) WriteBlobLSBLong(image,(unsigned int)
1980           image->chromaticity.blue_primary.y*0x3ffffff);
1981         (void) WriteBlobLSBLong(image,(unsigned int)
1982           (1.000f-(image->chromaticity.blue_primary.x+
1983           image->chromaticity.blue_primary.y)*0x3ffffff));
1984         (void) WriteBlobLSBLong(image,(unsigned int)
1985           bmp_info.gamma_scale.x*0xffff);
1986         (void) WriteBlobLSBLong(image,(unsigned int)
1987           bmp_info.gamma_scale.y*0xffff);
1988         (void) WriteBlobLSBLong(image,(unsigned int)
1989           bmp_info.gamma_scale.z*0xffff);
1990         if ((image->rendering_intent != UndefinedIntent) ||
1991             (profile != (StringInfo *) NULL))
1992           {
1993             ssize_t
1994               intent;
1995
1996             switch ((int) image->rendering_intent)
1997             {
1998               case SaturationIntent:
1999               {
2000                 intent=LCS_GM_BUSINESS;
2001                 break;
2002               }
2003               case RelativeIntent:
2004               {
2005                 intent=LCS_GM_GRAPHICS;
2006                 break;
2007               }
2008               case PerceptualIntent:
2009               {
2010                 intent=LCS_GM_IMAGES;
2011                 break;
2012               }
2013               case AbsoluteIntent:
2014               {
2015                 intent=LCS_GM_ABS_COLORIMETRIC;
2016                 break;
2017               }
2018               default:
2019               {
2020                 intent=0;
2021                 break;
2022               }
2023             }
2024             (void) WriteBlobLSBLong(image,(unsigned int) intent);
2025             (void) WriteBlobLSBLong(image,0x00);  /* dummy profile data */
2026             (void) WriteBlobLSBLong(image,0x00);  /* dummy profile length */
2027             (void) WriteBlobLSBLong(image,0x00);  /* reserved */
2028           }
2029       }
2030     if (image->storage_class == PseudoClass)
2031       {
2032         unsigned char
2033           *bmp_colormap;
2034
2035         /*
2036           Dump colormap to file.
2037         */
2038         if (image->debug != MagickFalse)
2039           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2040             "  Colormap: %.20g entries",(double) image->colors);
2041         bmp_colormap=(unsigned char *) AcquireQuantumMemory((size_t) (1UL <<
2042           bmp_info.bits_per_pixel),4*sizeof(*bmp_colormap));
2043         if (bmp_colormap == (unsigned char *) NULL)
2044           ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
2045         q=bmp_colormap;
2046         for (i=0; i < (ssize_t) MagickMin((ssize_t) image->colors,(ssize_t) bmp_info.number_colors); i++)
2047         {
2048           *q++=ScaleQuantumToChar(image->colormap[i].blue);
2049           *q++=ScaleQuantumToChar(image->colormap[i].green);
2050           *q++=ScaleQuantumToChar(image->colormap[i].red);
2051           if (type > 2)
2052             *q++=(unsigned char) 0x0;
2053         }
2054         for ( ; i < (ssize_t) (1UL << bmp_info.bits_per_pixel); i++)
2055         {
2056           *q++=(unsigned char) 0x00;
2057           *q++=(unsigned char) 0x00;
2058           *q++=(unsigned char) 0x00;
2059           if (type > 2)
2060             *q++=(unsigned char) 0x00;
2061         }
2062         if (type <= 2)
2063           (void) WriteBlob(image,(size_t) (3*(1L << bmp_info.bits_per_pixel)),
2064             bmp_colormap);
2065         else
2066           (void) WriteBlob(image,(size_t) (4*(1L << bmp_info.bits_per_pixel)),
2067             bmp_colormap);
2068         bmp_colormap=(unsigned char *) RelinquishMagickMemory(bmp_colormap);
2069       }
2070     if (image->debug != MagickFalse)
2071       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2072         "  Pixels:  %u bytes",bmp_info.image_size);
2073     (void) WriteBlob(image,(size_t) bmp_info.image_size,pixels);
2074     pixels=(unsigned char *) RelinquishMagickMemory(pixels);
2075     if (GetNextImageInList(image) == (Image *) NULL)
2076       break;
2077     image=SyncNextImageInList(image);
2078     status=SetImageProgress(image,SaveImagesTag,scene++,
2079       GetImageListLength(image));
2080     if (status == MagickFalse)
2081       break;
2082   } while (image_info->adjoin != MagickFalse);
2083   (void) CloseBlob(image);
2084   return(MagickTrue);
2085 }