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 %                                   Cristy                                    %
  17 %                            Glenn Randers-Pehrson                            %
  18 %                               December 2001                                 %
  19 %                                                                             %
  20 %                                                                             %
  21 %  Copyright 1999-2016 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/option.h"
  63 #include "MagickCore/pixel-accessor.h"
  64 #include "MagickCore/profile.h"
  65 #include "MagickCore/quantum-private.h"
  66 #include "MagickCore/static.h"
  67 #include "MagickCore/string_.h"
  68 #include "MagickCore/module.h"
  69 #include "MagickCore/transform.h"
  70 \f
  71 /*
  72   Macro definitions (from Windows wingdi.h).
  73 */
  74 #undef BI_JPEG
  75 #define BI_JPEG  4
  76 #undef BI_PNG
  77 #define BI_PNG  5
  78 #if !defined(MAGICKCORE_WINDOWS_SUPPORT) || defined(__MINGW32__) || defined(__MINGW64__)
  79 #undef BI_RGB
  80 #define BI_RGB  0
  81 #undef BI_RLE8
  82 #define BI_RLE8  1
  83 #undef BI_RLE4
  84 #define BI_RLE4  2
  85 #undef BI_BITFIELDS
  86 #define BI_BITFIELDS  3
  87
  88 #undef LCS_CALIBRATED_RBG
  89 #define LCS_CALIBRATED_RBG  0
  90 #undef LCS_sRGB
  91 #define LCS_sRGB  1
  92 #undef LCS_WINDOWS_COLOR_SPACE
  93 #define LCS_WINDOWS_COLOR_SPACE  2
  94 #undef PROFILE_LINKED
  95 #define PROFILE_LINKED  3
  96 #undef PROFILE_EMBEDDED
  97 #define PROFILE_EMBEDDED  4
  98
  99 #undef LCS_GM_BUSINESS
 100 #define LCS_GM_BUSINESS  1  /* Saturation */
 101 #undef LCS_GM_GRAPHICS
 102 #define LCS_GM_GRAPHICS  2  /* Relative */
 103 #undef LCS_GM_IMAGES
 104 #define LCS_GM_IMAGES  4  /* Perceptual */
 105 #undef LCS_GM_ABS_COLORIMETRIC
 106 #define LCS_GM_ABS_COLORIMETRIC  8  /* Absolute */
 107 #endif
 108 \f
 109 /*
 110   Typedef declarations.
 111 */
 112 typedef struct _BMPInfo
 113 {
 114   unsigned long
 115     file_size,
 116     ba_offset,
 117     offset_bits,
 118     size;
 119
 120   ssize_t
 121     width,
 122     height;
 123
 124   unsigned short
 125     planes,
 126     bits_per_pixel;
 127
 128   unsigned long
 129     compression,
 130     image_size,
 131     x_pixels,
 132     y_pixels,
 133     number_colors,
 134     red_mask,
 135     green_mask,
 136     blue_mask,
 137     alpha_mask,
 138     colors_important;
 139
 140   long
 141     colorspace;
 142
 143   PrimaryInfo
 144     red_primary,
 145     green_primary,
 146     blue_primary,
 147     gamma_scale;
 148 } BMPInfo;
 149 \f
 150 /*
 151   Forward declarations.
 152 */
 153 static MagickBooleanType
 154   WriteBMPImage(const ImageInfo *,Image *,ExceptionInfo *);
 155 \f
 156 /*
 157 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 158 %                                                                             %
 159 %                                                                             %
 160 %                                                                             %
 161 %   D e c o d e I m a g e                                                     %
 162 %                                                                             %
 163 %                                                                             %
 164 %                                                                             %
 165 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 166 %
 167 %  DecodeImage unpacks the packed image pixels into runlength-encoded
 168 %  pixel packets.
 169 %
 170 %  The format of the DecodeImage method is:
 171 %
 172 %      MagickBooleanType DecodeImage(Image *image,
 173 %        const size_t compression,unsigned char *pixels)
 174 %
 175 %  A description of each parameter follows:
 176 %
 177 %    o image: the address of a structure of type Image.
 178 %
 179 %    o compression:  Zero means uncompressed.  A value of 1 means the
 180 %      compressed pixels are runlength encoded for a 256-color bitmap.
 181 %      A value of 2 means a 16-color bitmap.  A value of 3 means bitfields
 182 %      encoding.
 183 %
 184 %    o pixels:  The address of a byte (8 bits) array of pixel data created by
 185 %      the decoding process.
 186 %
 187 */
 188 static MagickBooleanType DecodeImage(Image *image,const size_t compression,
 189   unsigned char *pixels)
 190 {
 191   int
 192     count;
 193
 194   register ssize_t
 195     i,
 196     x;
 197
 198   register unsigned char
 199     *p,
 200     *q;
 201
 202   ssize_t
 203     y;
 204
 205   unsigned char
 206     byte;
 207
 208   assert(image != (Image *) NULL);
 209   assert(image->signature == MagickCoreSignature);
 210   if (image->debug != MagickFalse)
 211     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 212   assert(pixels != (unsigned char *) NULL);
 213   (void) ResetMagickMemory(pixels,0,(size_t) image->columns*image->rows*
 214     sizeof(*pixels));
 215   byte=0;
 216   x=0;
 217   p=pixels;
 218   q=pixels+(size_t) image->columns*image->rows;
 219   for (y=0; y < (ssize_t) image->rows; )
 220   {
 221     MagickBooleanType
 222       status;
 223
 224     if ((p < pixels) || (p > q))
 225       break;
 226     count=ReadBlobByte(image);
 227     if (count == EOF)
 228       break;
 229     if (count != 0)
 230       {
 231         /*
 232           Encoded mode.
 233         */
 234         count=(int) MagickMin((ssize_t) count,(ssize_t) (q-p));
 235         byte=(unsigned char) ReadBlobByte(image);
 236         if (compression == BI_RLE8)
 237           {
 238             for (i=0; i < (ssize_t) count; i++)
 239               *p++=(unsigned char) byte;
 240           }
 241         else
 242           {
 243             for (i=0; i < (ssize_t) count; i++)
 244               *p++=(unsigned char)
 245                 ((i & 0x01) != 0 ? (byte & 0x0f) : ((byte >> 4) & 0x0f));
 246           }
 247         x+=count;
 248       }
 249     else
 250       {
 251         /*
 252           Escape mode.
 253         */
 254         count=ReadBlobByte(image);
 255         if (count == EOF)
 256           break;
 257         if (count == 0x01)
 258           return(MagickTrue);
 259         switch (count)
 260         {
 261           case 0x00:
 262           {
 263             /*
 264               End of line.
 265             */
 266             x=0;
 267             y++;
 268             p=pixels+y*image->columns;
 269             break;
 270           }
 271           case 0x02:
 272           {
 273             /*
 274               Delta mode.
 275             */
 276             x+=ReadBlobByte(image);
 277             y+=ReadBlobByte(image);
 278             p=pixels+y*image->columns+x;
 279             break;
 280           }
 281           default:
 282           {
 283             /*
 284               Absolute mode.
 285             */
 286             count=(int) MagickMin((ssize_t) count,(ssize_t) (q-p));
 287             if (compression == BI_RLE8)
 288               for (i=0; i < (ssize_t) count; i++)
 289                 *p++=(unsigned char) ReadBlobByte(image);
 290             else
 291               for (i=0; i < (ssize_t) count; i++)
 292               {
 293                 if ((i & 0x01) == 0)
 294                   byte=(unsigned char) ReadBlobByte(image);
 295                 *p++=(unsigned char)
 296                   ((i & 0x01) != 0 ? (byte & 0x0f) : ((byte >> 4) & 0x0f));
 297               }
 298             x+=count;
 299             /*
 300               Read pad byte.
 301             */
 302             if (compression == BI_RLE8)
 303               {
 304                 if ((count & 0x01) != 0)
 305                   (void) ReadBlobByte(image);
 306               }
 307             else
 308               if (((count & 0x03) == 1) || ((count & 0x03) == 2))
 309                 (void) ReadBlobByte(image);
 310             break;
 311           }
 312         }
 313       }
 314     status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 315       image->rows);
 316     if (status == MagickFalse)
 317       break;
 318   }
 319   (void) ReadBlobByte(image);  /* end of line */
 320   (void) ReadBlobByte(image);
 321   return(y < (ssize_t) image->rows ? MagickFalse : MagickTrue);
 322 }
 323 \f
 324 /*
 325 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 326 %                                                                             %
 327 %                                                                             %
 328 %                                                                             %
 329 %   E n c o d e I m a g e                                                     %
 330 %                                                                             %
 331 %                                                                             %
 332 %                                                                             %
 333 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 334 %
 335 %  EncodeImage compresses pixels using a runlength encoded format.
 336 %
 337 %  The format of the EncodeImage method is:
 338 %
 339 %    static MagickBooleanType EncodeImage(Image *image,
 340 %      const size_t bytes_per_line,const unsigned char *pixels,
 341 %      unsigned char *compressed_pixels)
 342 %
 343 %  A description of each parameter follows:
 344 %
 345 %    o image:  The image.
 346 %
 347 %    o bytes_per_line: the number of bytes in a scanline of compressed pixels
 348 %
 349 %    o pixels:  The address of a byte (8 bits) array of pixel data created by
 350 %      the compression process.
 351 %
 352 %    o compressed_pixels:  The address of a byte (8 bits) array of compressed
 353 %      pixel data.
 354 %
 355 */
 356 static size_t EncodeImage(Image *image,const size_t bytes_per_line,
 357   const unsigned char *pixels,unsigned char *compressed_pixels)
 358 {
 359   MagickBooleanType
 360     status;
 361
 362   register const unsigned char
 363     *p;
 364
 365   register ssize_t
 366     i,
 367     x;
 368
 369   register unsigned char
 370     *q;
 371
 372   ssize_t
 373     y;
 374
 375   /*
 376     Runlength encode pixels.
 377   */
 378   assert(image != (Image *) NULL);
 379   assert(image->signature == MagickCoreSignature);
 380   if (image->debug != MagickFalse)
 381     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 382   assert(pixels != (const unsigned char *) NULL);
 383   assert(compressed_pixels != (unsigned char *) NULL);
 384   p=pixels;
 385   q=compressed_pixels;
 386   i=0;
 387   for (y=0; y < (ssize_t) image->rows; y++)
 388   {
 389     for (x=0; x < (ssize_t) bytes_per_line; x+=i)
 390     {
 391       /*
 392         Determine runlength.
 393       */
 394       for (i=1; ((x+i) < (ssize_t) bytes_per_line); i++)
 395         if ((i == 255) || (*(p+i) != *p))
 396           break;
 397       *q++=(unsigned char) i;
 398       *q++=(*p);
 399       p+=i;
 400     }
 401     /*
 402       End of line.
 403     */
 404     *q++=(unsigned char) 0x00;
 405     *q++=(unsigned char) 0x00;
 406     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 407       image->rows);
 408     if (status == MagickFalse)
 409       break;
 410   }
 411   /*
 412     End of bitmap.
 413   */
 414   *q++=(unsigned char) 0x00;
 415   *q++=(unsigned char) 0x01;
 416   return((size_t) (q-compressed_pixels));
 417 }
 418 \f
 419 /*
 420 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 421 %                                                                             %
 422 %                                                                             %
 423 %                                                                             %
 424 %   I s B M P                                                                 %
 425 %                                                                             %
 426 %                                                                             %
 427 %                                                                             %
 428 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 429 %
 430 %  IsBMP() returns MagickTrue if the image format type, identified by the
 431 %  magick string, is BMP.
 432 %
 433 %  The format of the IsBMP method is:
 434 %
 435 %      MagickBooleanType IsBMP(const unsigned char *magick,const size_t length)
 436 %
 437 %  A description of each parameter follows:
 438 %
 439 %    o magick: compare image format pattern against these bytes.
 440 %
 441 %    o length: Specifies the length of the magick string.
 442 %
 443 */
 444 static MagickBooleanType IsBMP(const unsigned char *magick,const size_t length)
 445 {
 446   if (length < 2)
 447     return(MagickFalse);
 448   if ((LocaleNCompare((char *) magick,"BA",2) == 0) ||
 449       (LocaleNCompare((char *) magick,"BM",2) == 0) ||
 450       (LocaleNCompare((char *) magick,"IC",2) == 0) ||
 451       (LocaleNCompare((char *) magick,"PI",2) == 0) ||
 452       (LocaleNCompare((char *) magick,"CI",2) == 0) ||
 453       (LocaleNCompare((char *) magick,"CP",2) == 0))
 454     return(MagickTrue);
 455   return(MagickFalse);
 456 }
 457 \f
 458 /*
 459 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 460 %                                                                             %
 461 %                                                                             %
 462 %                                                                             %
 463 %   R e a d B M P I m a g e                                                   %
 464 %                                                                             %
 465 %                                                                             %
 466 %                                                                             %
 467 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 468 %
 469 %  ReadBMPImage() reads a Microsoft Windows bitmap image file, Version
 470 %  2, 3 (for Windows or NT), or 4, and  returns it.  It allocates the memory
 471 %  necessary for the new Image structure and returns a pointer to the new
 472 %  image.
 473 %
 474 %  The format of the ReadBMPImage method is:
 475 %
 476 %      image=ReadBMPImage(image_info)
 477 %
 478 %  A description of each parameter follows:
 479 %
 480 %    o image_info: the image info.
 481 %
 482 %    o exception: return any errors or warnings in this structure.
 483 %
 484 */
 485
 486 static Image *ReadBMPImage(const ImageInfo *image_info,ExceptionInfo *exception)
 487 {
 488   BMPInfo
 489     bmp_info;
 490
 491   Image
 492     *image;
 493
 494   MagickBooleanType
 495     status;
 496
 497   MagickOffsetType
 498     offset,
 499     start_position;
 500
 501   MemoryInfo
 502     *pixel_info;
 503
 504   Quantum
 505     index;
 506
 507   register Quantum
 508     *q;
 509
 510   register ssize_t
 511     i,
 512     x;
 513
 514   register unsigned char
 515     *p;
 516
 517   size_t
 518     bit,
 519     blue,
 520     bytes_per_line,
 521     green,
 522     length,
 523     red;
 524
 525   ssize_t
 526     count,
 527     y;
 528
 529   unsigned char
 530     magick[12],
 531     *pixels;
 532
 533   /*
 534     Open image file.
 535   */
 536   assert(image_info != (const ImageInfo *) NULL);
 537   assert(image_info->signature == MagickCoreSignature);
 538   if (image_info->debug != MagickFalse)
 539     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 540       image_info->filename);
 541   assert(exception != (ExceptionInfo *) NULL);
 542   assert(exception->signature == MagickCoreSignature);
 543   image=AcquireImage(image_info,exception);
 544   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 545   if (status == MagickFalse)
 546     {
 547       image=DestroyImageList(image);
 548       return((Image *) NULL);
 549     }
 550   /*
 551     Determine if this a BMP file.
 552   */
 553   (void) ResetMagickMemory(&bmp_info,0,sizeof(bmp_info));
 554   bmp_info.ba_offset=0;
 555   start_position=0;
 556   count=ReadBlob(image,2,magick);
 557   if (count != 2)
 558     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 559   do
 560   {
 561     PixelInfo
 562       quantum_bits;
 563
 564     PixelPacket
 565       shift;
 566
 567     size_t
 568       profile_data,
 569       profile_size;
 570
 571     /*
 572       Verify BMP identifier.
 573     */
 574     if (bmp_info.ba_offset == 0)
 575       start_position=TellBlob(image)-2;
 576     bmp_info.ba_offset=0;
 577     while (LocaleNCompare((char *) magick,"BA",2) == 0)
 578     {
 579       bmp_info.file_size=ReadBlobLSBLong(image);
 580       bmp_info.ba_offset=ReadBlobLSBLong(image);
 581       bmp_info.offset_bits=ReadBlobLSBLong(image);
 582       count=ReadBlob(image,2,magick);
 583       if (count != 2)
 584         break;
 585     }
 586     if (image->debug != MagickFalse)
 587       (void) LogMagickEvent(CoderEvent,GetMagickModule(),"  Magick: %c%c",
 588         magick[0],magick[1]);
 589     if ((count != 2) || ((LocaleNCompare((char *) magick,"BM",2) != 0) &&
 590         (LocaleNCompare((char *) magick,"CI",2) != 0)))
 591       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 592     bmp_info.file_size=ReadBlobLSBLong(image);
 593     (void) ReadBlobLSBLong(image);
 594     bmp_info.offset_bits=ReadBlobLSBLong(image);
 595     bmp_info.size=ReadBlobLSBLong(image);
 596     if (image->debug != MagickFalse)
 597       (void) LogMagickEvent(CoderEvent,GetMagickModule(),"  BMP size: %lu",
 598         bmp_info.size);
 599     if (bmp_info.size == 12)
 600       {
 601         /*
 602           OS/2 BMP image file.
 603         */
 604         (void) CopyMagickString(image->magick,"BMP2",MagickPathExtent);
 605         bmp_info.width=(ssize_t) ((short) ReadBlobLSBShort(image));
 606         bmp_info.height=(ssize_t) ((short) ReadBlobLSBShort(image));
 607         bmp_info.planes=ReadBlobLSBShort(image);
 608         bmp_info.bits_per_pixel=ReadBlobLSBShort(image);
 609         bmp_info.x_pixels=0;
 610         bmp_info.y_pixels=0;
 611         bmp_info.number_colors=0;
 612         bmp_info.compression=BI_RGB;
 613         bmp_info.image_size=0;
 614         bmp_info.alpha_mask=0;
 615         if (image->debug != MagickFalse)
 616           {
 617             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 618               "  Format: OS/2 Bitmap");
 619             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 620               "  Geometry: %.20gx%.20g",(double) bmp_info.width,(double)
 621               bmp_info.height);
 622           }
 623       }
 624     else
 625       {
 626         /*
 627           Microsoft Windows BMP image file.
 628         */
 629         if (bmp_info.size < 40)
 630           ThrowReaderException(CorruptImageError,"NonOS2HeaderSizeError");
 631         bmp_info.width=(ssize_t) ReadBlobLSBSignedLong(image);
 632         bmp_info.height=(ssize_t) ReadBlobLSBSignedLong(image);
 633         bmp_info.planes=ReadBlobLSBShort(image);
 634         bmp_info.bits_per_pixel=ReadBlobLSBShort(image);
 635         bmp_info.compression=ReadBlobLSBLong(image);
 636         bmp_info.image_size=ReadBlobLSBLong(image);
 637         bmp_info.x_pixels=ReadBlobLSBLong(image);
 638         bmp_info.y_pixels=ReadBlobLSBLong(image);
 639         bmp_info.number_colors=ReadBlobLSBLong(image);
 640         bmp_info.colors_important=ReadBlobLSBLong(image);
 641         profile_data=0;
 642         profile_size=0;
 643         if (image->debug != MagickFalse)
 644           {
 645             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 646               "  Format: MS Windows bitmap");
 647             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 648               "  Geometry: %.20gx%.20g",(double) bmp_info.width,(double)
 649               bmp_info.height);
 650             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 651               "  Bits per pixel: %.20g",(double) bmp_info.bits_per_pixel);
 652             switch ((int) bmp_info.compression)
 653             {
 654               case BI_RGB:
 655               {
 656                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 657                   "  Compression: BI_RGB");
 658                 break;
 659               }
 660               case BI_RLE4:
 661               {
 662                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 663                   "  Compression: BI_RLE4");
 664                 break;
 665               }
 666               case BI_RLE8:
 667               {
 668                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 669                   "  Compression: BI_RLE8");
 670                 break;
 671               }
 672               case BI_BITFIELDS:
 673               {
 674                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 675                   "  Compression: BI_BITFIELDS");
 676                 break;
 677               }
 678               case BI_PNG:
 679               {
 680                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 681                   "  Compression: BI_PNG");
 682                 break;
 683               }
 684               case BI_JPEG:
 685               {
 686                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 687                   "  Compression: BI_JPEG");
 688                 break;
 689               }
 690               default:
 691               {
 692                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 693                   "  Compression: UNKNOWN (%lu)",bmp_info.compression);
 694               }
 695             }
 696             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 697               "  Number of colors: %lu",bmp_info.number_colors);
 698           }
 699         bmp_info.red_mask=ReadBlobLSBLong(image);
 700         bmp_info.green_mask=ReadBlobLSBLong(image);
 701         bmp_info.blue_mask=ReadBlobLSBLong(image);
 702         if (bmp_info.size > 40)
 703           {
 704             double
 705               gamma;
 706
 707             /*
 708               Read color management information.
 709             */
 710             bmp_info.alpha_mask=ReadBlobLSBLong(image);
 711             bmp_info.colorspace=ReadBlobLSBSignedLong(image);
 712             /*
 713               Decode 2^30 fixed point formatted CIE primaries.
 714             */
 715 #           define BMP_DENOM ((double) 0x40000000)
 716             bmp_info.red_primary.x=(double) ReadBlobLSBLong(image)/BMP_DENOM;
 717             bmp_info.red_primary.y=(double) ReadBlobLSBLong(image)/BMP_DENOM;
 718             bmp_info.red_primary.z=(double) ReadBlobLSBLong(image)/BMP_DENOM;
 719             bmp_info.green_primary.x=(double) ReadBlobLSBLong(image)/BMP_DENOM;
 720             bmp_info.green_primary.y=(double) ReadBlobLSBLong(image)/BMP_DENOM;
 721             bmp_info.green_primary.z=(double) ReadBlobLSBLong(image)/BMP_DENOM;
 722             bmp_info.blue_primary.x=(double) ReadBlobLSBLong(image)/BMP_DENOM;
 723             bmp_info.blue_primary.y=(double) ReadBlobLSBLong(image)/BMP_DENOM;
 724             bmp_info.blue_primary.z=(double) ReadBlobLSBLong(image)/BMP_DENOM;
 725
 726             gamma=bmp_info.red_primary.x+bmp_info.red_primary.y+
 727               bmp_info.red_primary.z;
 728             gamma=PerceptibleReciprocal(gamma);
 729             bmp_info.red_primary.x*=gamma;
 730             bmp_info.red_primary.y*=gamma;
 731             image->chromaticity.red_primary.x=bmp_info.red_primary.x;
 732             image->chromaticity.red_primary.y=bmp_info.red_primary.y;
 733
 734             gamma=bmp_info.green_primary.x+bmp_info.green_primary.y+
 735               bmp_info.green_primary.z;
 736             gamma=PerceptibleReciprocal(gamma);
 737             bmp_info.green_primary.x*=gamma;
 738             bmp_info.green_primary.y*=gamma;
 739             image->chromaticity.green_primary.x=bmp_info.green_primary.x;
 740             image->chromaticity.green_primary.y=bmp_info.green_primary.y;
 741
 742             gamma=bmp_info.blue_primary.x+bmp_info.blue_primary.y+
 743               bmp_info.blue_primary.z;
 744             gamma=PerceptibleReciprocal(gamma);
 745             bmp_info.blue_primary.x*=gamma;
 746             bmp_info.blue_primary.y*=gamma;
 747             image->chromaticity.blue_primary.x=bmp_info.blue_primary.x;
 748             image->chromaticity.blue_primary.y=bmp_info.blue_primary.y;
 749
 750             /*
 751               Decode 16^16 fixed point formatted gamma_scales.
 752             */
 753             bmp_info.gamma_scale.x=(double) ReadBlobLSBLong(image)/0x10000;
 754             bmp_info.gamma_scale.y=(double) ReadBlobLSBLong(image)/0x10000;
 755             bmp_info.gamma_scale.z=(double) ReadBlobLSBLong(image)/0x10000;
 756             /*
 757               Compute a single gamma from the BMP 3-channel gamma.
 758             */
 759             image->gamma=(bmp_info.gamma_scale.x+bmp_info.gamma_scale.y+
 760               bmp_info.gamma_scale.z)/3.0;
 761           }
 762         else
 763           (void) CopyMagickString(image->magick,"BMP3",MagickPathExtent);
 764
 765         if (bmp_info.size > 108)
 766           {
 767             size_t
 768               intent;
 769
 770             /*
 771               Read BMP Version 5 color management information.
 772             */
 773             intent=ReadBlobLSBLong(image);
 774             switch ((int) intent)
 775             {
 776               case LCS_GM_BUSINESS:
 777               {
 778                 image->rendering_intent=SaturationIntent;
 779                 break;
 780               }
 781               case LCS_GM_GRAPHICS:
 782               {
 783                 image->rendering_intent=RelativeIntent;
 784                 break;
 785               }
 786               case LCS_GM_IMAGES:
 787               {
 788                 image->rendering_intent=PerceptualIntent;
 789                 break;
 790               }
 791               case LCS_GM_ABS_COLORIMETRIC:
 792               {
 793                 image->rendering_intent=AbsoluteIntent;
 794                 break;
 795               }
 796             }
 797             profile_data=ReadBlobLSBLong(image);
 798             profile_size=ReadBlobLSBLong(image);
 799             (void) profile_data;
 800             (void) profile_size;
 801             (void) ReadBlobLSBLong(image);  /* Reserved byte */
 802           }
 803       }
 804     if ((MagickSizeType) bmp_info.file_size > GetBlobSize(image))
 805       (void) ThrowMagickException(exception,GetMagickModule(),CorruptImageError,
 806         "LengthAndFilesizeDoNotMatch","`%s'",image->filename);
 807     else
 808       if ((MagickSizeType) bmp_info.file_size < GetBlobSize(image))
 809         (void) ThrowMagickException(exception,GetMagickModule(),
 810           CorruptImageWarning,"LengthAndFilesizeDoNotMatch","`%s'",
 811           image->filename);
 812     if (bmp_info.width <= 0)
 813       ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
 814     if (bmp_info.height == 0)
 815       ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
 816     if (bmp_info.planes != 1)
 817       ThrowReaderException(CorruptImageError,"StaticPlanesValueNotEqualToOne");
 818     if ((bmp_info.bits_per_pixel != 1) && (bmp_info.bits_per_pixel != 4) &&
 819         (bmp_info.bits_per_pixel != 8) && (bmp_info.bits_per_pixel != 16) &&
 820         (bmp_info.bits_per_pixel != 24) && (bmp_info.bits_per_pixel != 32))
 821       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 822     if (bmp_info.bits_per_pixel < 16 &&
 823         bmp_info.number_colors > (1U << bmp_info.bits_per_pixel))
 824       ThrowReaderException(CorruptImageError,"UnrecognizedNumberOfColors");
 825     if ((bmp_info.compression == 1) && (bmp_info.bits_per_pixel != 8))
 826       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 827     if ((bmp_info.compression == 2) && (bmp_info.bits_per_pixel != 4))
 828       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 829     if ((bmp_info.compression == 3) && (bmp_info.bits_per_pixel < 16))
 830       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 831     switch (bmp_info.compression)
 832     {
 833       case BI_RGB:
 834         image->compression=NoCompression;
 835         break;
 836       case BI_RLE8:
 837       case BI_RLE4:
 838         image->compression=RLECompression;
 839         break;
 840       case BI_BITFIELDS:
 841         break;
 842       case BI_JPEG:
 843         ThrowReaderException(CoderError,"JPEGCompressNotSupported");
 844       case BI_PNG:
 845         ThrowReaderException(CoderError,"PNGCompressNotSupported");
 846       default:
 847         ThrowReaderException(CorruptImageError,"UnrecognizedImageCompression");
 848     }
 849     image->columns=(size_t) MagickAbsoluteValue(bmp_info.width);
 850     image->rows=(size_t) MagickAbsoluteValue(bmp_info.height);
 851     image->depth=bmp_info.bits_per_pixel <= 8 ? bmp_info.bits_per_pixel : 8;
 852     image->alpha_trait=((bmp_info.alpha_mask != 0) &&
 853       (bmp_info.compression == BI_BITFIELDS)) ? BlendPixelTrait :
 854       UndefinedPixelTrait;
 855     if (bmp_info.bits_per_pixel < 16)
 856       {
 857         size_t
 858           one;
 859
 860         image->storage_class=PseudoClass;
 861         image->colors=bmp_info.number_colors;
 862         one=1;
 863         if (image->colors == 0)
 864           image->colors=one << bmp_info.bits_per_pixel;
 865       }
 866     if (image->storage_class == PseudoClass)
 867       {
 868         unsigned char
 869           *bmp_colormap;
 870
 871         size_t
 872           packet_size;
 873
 874         /*
 875           Read BMP raster colormap.
 876         */
 877         if (image->debug != MagickFalse)
 878           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 879             "  Reading colormap of %.20g colors",(double) image->colors);
 880         if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 881           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 882         bmp_colormap=(unsigned char *) AcquireQuantumMemory((size_t)
 883           image->colors,4*sizeof(*bmp_colormap));
 884         if (bmp_colormap == (unsigned char *) NULL)
 885           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 886         if ((bmp_info.size == 12) || (bmp_info.size == 64))
 887           packet_size=3;
 888         else
 889           packet_size=4;
 890         offset=SeekBlob(image,start_position+14+bmp_info.size,SEEK_SET);
 891         if (offset < 0)
 892           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 893         count=ReadBlob(image,packet_size*image->colors,bmp_colormap);
 894         if (count != (ssize_t) (packet_size*image->colors))
 895           ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
 896         p=bmp_colormap;
 897         for (i=0; i < (ssize_t) image->colors; i++)
 898         {
 899           image->colormap[i].blue=(MagickRealType) ScaleCharToQuantum(*p++);
 900           image->colormap[i].green=(MagickRealType) ScaleCharToQuantum(*p++);
 901           image->colormap[i].red=(MagickRealType) ScaleCharToQuantum(*p++);
 902           if (packet_size == 4)
 903             p++;
 904         }
 905         bmp_colormap=(unsigned char *) RelinquishMagickMemory(bmp_colormap);
 906       }
 907     image->resolution.x=(double) bmp_info.x_pixels/100.0;
 908     image->resolution.y=(double) bmp_info.y_pixels/100.0;
 909     image->units=PixelsPerCentimeterResolution;
 910     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 911       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 912         break;
 913     status=SetImageExtent(image,image->columns,image->rows,exception);
 914     if (status == MagickFalse)
 915       return(DestroyImageList(image));
 916     /*
 917       Read image data.
 918     */
 919     offset=SeekBlob(image,start_position+bmp_info.offset_bits,SEEK_SET);
 920     if (offset < 0)
 921       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 922     if (bmp_info.compression == BI_RLE4)
 923       bmp_info.bits_per_pixel<<=1;
 924     bytes_per_line=4*((image->columns*bmp_info.bits_per_pixel+31)/32);
 925     length=(size_t) bytes_per_line*image->rows;
 926     pixel_info=AcquireVirtualMemory((size_t) image->rows,
 927       MagickMax(bytes_per_line,image->columns+256UL)*sizeof(*pixels));
 928     if (pixel_info == (MemoryInfo *) NULL)
 929       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 930     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
 931     if ((bmp_info.compression == BI_RGB) ||
 932         (bmp_info.compression == BI_BITFIELDS))
 933       {
 934         if (image->debug != MagickFalse)
 935           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 936             "  Reading pixels (%.20g bytes)",(double) length);
 937         count=ReadBlob(image,length,pixels);
 938         if (count != (ssize_t) length)
 939           {
 940             pixel_info=RelinquishVirtualMemory(pixel_info);
 941             ThrowReaderException(CorruptImageError,
 942               "InsufficientImageDataInFile");
 943           }
 944       }
 945     else
 946       {
 947         /*
 948           Convert run-length encoded raster pixels.
 949         */
 950         status=DecodeImage(image,bmp_info.compression,pixels);
 951         if (status == MagickFalse)
 952           {
 953             pixel_info=RelinquishVirtualMemory(pixel_info);
 954             ThrowReaderException(CorruptImageError,
 955               "UnableToRunlengthDecodeImage");
 956           }
 957       }
 958     /*
 959       Convert BMP raster image to pixel packets.
 960     */
 961     if (bmp_info.compression == BI_RGB)
 962       {
 963         /*
 964           We should ignore the alpha value in BMP3 files but there have been
 965           reports about 32 bit files with alpha. We do a quick check to see if
 966           the alpha channel contains a value that is not zero (default value).
 967           If we find a non zero value we asume the program that wrote the file
 968           wants to use the alpha channel.
 969         */
 970         if ((image->alpha_trait == UndefinedPixelTrait) && (bmp_info.size == 40) &&
 971             (bmp_info.bits_per_pixel == 32))
 972           {
 973             bytes_per_line=4*(image->columns);
 974             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 975             {
 976               p=pixels+(image->rows-y-1)*bytes_per_line;
 977               for (x=0; x < (ssize_t) image->columns; x++)
 978               {
 979                 if (*(p+3) != 0)
 980                   {
 981                     image->alpha_trait=BlendPixelTrait;
 982                     y=-1;
 983                     break;
 984                   }
 985                 p+=4;
 986               }
 987             }
 988           }
 989         bmp_info.alpha_mask=image->alpha_trait != UndefinedPixelTrait ?
 990           0xff000000U : 0U;
 991         bmp_info.red_mask=0x00ff0000U;
 992         bmp_info.green_mask=0x0000ff00U;
 993         bmp_info.blue_mask=0x000000ffU;
 994         if (bmp_info.bits_per_pixel == 16)
 995           {
 996             /*
 997               RGB555.
 998             */
 999             bmp_info.red_mask=0x00007c00U;
1000             bmp_info.green_mask=0x000003e0U;
1001             bmp_info.blue_mask=0x0000001fU;
1002           }
1003       }
1004     (void) ResetMagickMemory(&shift,0,sizeof(shift));
1005     (void) ResetMagickMemory(&quantum_bits,0,sizeof(quantum_bits));
1006     if ((bmp_info.bits_per_pixel == 16) || (bmp_info.bits_per_pixel == 32))
1007       {
1008         register size_t
1009           sample;
1010
1011         /*
1012           Get shift and quantum bits info from bitfield masks.
1013         */
1014         if (bmp_info.red_mask != 0)
1015           while (((bmp_info.red_mask << shift.red) & 0x80000000UL) == 0)
1016             shift.red++;
1017         if (bmp_info.green_mask != 0)
1018           while (((bmp_info.green_mask << shift.green) & 0x80000000UL) == 0)
1019             shift.green++;
1020         if (bmp_info.blue_mask != 0)
1021           while (((bmp_info.blue_mask << shift.blue) & 0x80000000UL) == 0)
1022             shift.blue++;
1023         if (bmp_info.alpha_mask != 0)
1024           while (((bmp_info.alpha_mask << shift.alpha) & 0x80000000UL) == 0)
1025             shift.alpha++;
1026         sample=shift.red;
1027         while (((bmp_info.red_mask << sample) & 0x80000000UL) != 0)
1028           sample++;
1029         quantum_bits.red=(MagickRealType) (sample-shift.red);
1030         sample=shift.green;
1031         while (((bmp_info.green_mask << sample) & 0x80000000UL) != 0)
1032           sample++;
1033         quantum_bits.green=(MagickRealType) (sample-shift.green);
1034         sample=shift.blue;
1035         while (((bmp_info.blue_mask << sample) & 0x80000000UL) != 0)
1036           sample++;
1037         quantum_bits.blue=(MagickRealType) (sample-shift.blue);
1038         sample=shift.alpha;
1039         while (((bmp_info.alpha_mask << sample) & 0x80000000UL) != 0)
1040           sample++;
1041         quantum_bits.alpha=(MagickRealType) (sample-shift.alpha);
1042       }
1043     switch (bmp_info.bits_per_pixel)
1044     {
1045       case 1:
1046       {
1047         /*
1048           Convert bitmap scanline.
1049         */
1050         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1051         {
1052           p=pixels+(image->rows-y-1)*bytes_per_line;
1053           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1054           if (q == (Quantum *) NULL)
1055             break;
1056           for (x=0; x < ((ssize_t) image->columns-7); x+=8)
1057           {
1058             for (bit=0; bit < 8; bit++)
1059             {
1060               index=(Quantum) (((*p) & (0x80 >> bit)) != 0 ? 0x01 : 0x00);
1061               SetPixelIndex(image,index,q);
1062               q+=GetPixelChannels(image);
1063             }
1064             p++;
1065           }
1066           if ((image->columns % 8) != 0)
1067             {
1068               for (bit=0; bit < (image->columns % 8); bit++)
1069               {
1070                 index=(Quantum) (((*p) & (0x80 >> bit)) != 0 ? 0x01 : 0x00);
1071                 SetPixelIndex(image,index,q);
1072                 q+=GetPixelChannels(image);
1073               }
1074               p++;
1075             }
1076           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1077             break;
1078           if (image->previous == (Image *) NULL)
1079             {
1080               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1081                 (image->rows-y),image->rows);
1082               if (status == MagickFalse)
1083                 break;
1084             }
1085         }
1086         (void) SyncImage(image,exception);
1087         break;
1088       }
1089       case 4:
1090       {
1091         /*
1092           Convert PseudoColor scanline.
1093         */
1094         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1095         {
1096           p=pixels+(image->rows-y-1)*bytes_per_line;
1097           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1098           if (q == (Quantum *) NULL)
1099             break;
1100           for (x=0; x < ((ssize_t) image->columns-1); x+=2)
1101           {
1102             ValidateColormapValue(image,(*p >> 4) & 0x0f,&index,exception);
1103             SetPixelIndex(image,index,q);
1104             q+=GetPixelChannels(image);
1105             ValidateColormapValue(image,*p & 0x0f,&index,exception);
1106             SetPixelIndex(image,index,q);
1107             q+=GetPixelChannels(image);
1108             p++;
1109           }
1110           if ((image->columns % 2) != 0)
1111             {
1112               ValidateColormapValue(image,(*p >> 4) & 0xf,&index,exception);
1113               SetPixelIndex(image,index,q);
1114               q+=GetPixelChannels(image);
1115               p++;
1116               x++;
1117             }
1118           if (x < (ssize_t) image->columns)
1119             break;
1120           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1121             break;
1122           if (image->previous == (Image *) NULL)
1123             {
1124               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1125                 (image->rows-y),image->rows);
1126               if (status == MagickFalse)
1127                 break;
1128             }
1129         }
1130         (void) SyncImage(image,exception);
1131         break;
1132       }
1133       case 8:
1134       {
1135         /*
1136           Convert PseudoColor scanline.
1137         */
1138         if ((bmp_info.compression == BI_RLE8) ||
1139             (bmp_info.compression == BI_RLE4))
1140           bytes_per_line=image->columns;
1141         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1142         {
1143           p=pixels+(image->rows-y-1)*bytes_per_line;
1144           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1145           if (q == (Quantum *) NULL)
1146             break;
1147           for (x=(ssize_t) image->columns; x != 0; --x)
1148           {
1149             ValidateColormapValue(image,*p++,&index,exception);
1150             SetPixelIndex(image,index,q);
1151             q+=GetPixelChannels(image);
1152           }
1153           if (x > 0)
1154             break;
1155           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1156             break;
1157           offset=(MagickOffsetType) (image->rows-y-1);
1158           if (image->previous == (Image *) NULL)
1159             {
1160               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1161                 (image->rows-y),image->rows);
1162               if (status == MagickFalse)
1163                 break;
1164             }
1165         }
1166         (void) SyncImage(image,exception);
1167         break;
1168       }
1169       case 16:
1170       {
1171         size_t
1172           alpha,
1173           pixel;
1174
1175         /*
1176           Convert bitfield encoded 16-bit PseudoColor scanline.
1177         */
1178         if (bmp_info.compression != BI_RGB &&
1179             bmp_info.compression != BI_BITFIELDS)
1180           {
1181             pixel_info=RelinquishVirtualMemory(pixel_info);
1182             ThrowReaderException(CorruptImageError,
1183               "UnrecognizedImageCompression");
1184           }
1185         bytes_per_line=2*(image->columns+image->columns % 2);
1186         image->storage_class=DirectClass;
1187         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1188         {
1189           p=pixels+(image->rows-y-1)*bytes_per_line;
1190           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1191           if (q == (Quantum *) NULL)
1192             break;
1193           for (x=0; x < (ssize_t) image->columns; x++)
1194           {
1195             pixel=(size_t) (*p++);
1196             pixel|=(*p++) << 8;
1197             red=((pixel & bmp_info.red_mask) << shift.red) >> 16;
1198             if (quantum_bits.red == 5)
1199               red|=((red & 0xe000) >> 5);
1200             if (quantum_bits.red <= 8)
1201               red|=((red & 0xff00) >> 8);
1202             green=((pixel & bmp_info.green_mask) << shift.green) >> 16;
1203             if (quantum_bits.green == 5)
1204               green|=((green & 0xe000) >> 5);
1205             if (quantum_bits.green == 6)
1206               green|=((green & 0xc000) >> 6);
1207             if (quantum_bits.green <= 8)
1208               green|=((green & 0xff00) >> 8);
1209             blue=((pixel & bmp_info.blue_mask) << shift.blue) >> 16;
1210             if (quantum_bits.blue == 5)
1211               blue|=((blue & 0xe000) >> 5);
1212             if (quantum_bits.blue <= 8)
1213               blue|=((blue & 0xff00) >> 8);
1214             SetPixelRed(image,ScaleShortToQuantum((unsigned short) red),q);
1215             SetPixelGreen(image,ScaleShortToQuantum((unsigned short) green),q);
1216             SetPixelBlue(image,ScaleShortToQuantum((unsigned short) blue),q);
1217             SetPixelAlpha(image,OpaqueAlpha,q);
1218             if (image->alpha_trait != UndefinedPixelTrait)
1219               {
1220                 alpha=((pixel & bmp_info.alpha_mask) << shift.alpha) >> 16;
1221                 if (quantum_bits.alpha <= 8)
1222                   alpha|=((alpha & 0xff00) >> 8);
1223                 SetPixelAlpha(image,ScaleShortToQuantum(
1224                   (unsigned short) alpha),q);
1225               }
1226             q+=GetPixelChannels(image);
1227           }
1228           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1229             break;
1230           offset=(MagickOffsetType) (image->rows-y-1);
1231           if (image->previous == (Image *) NULL)
1232             {
1233               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1234                 (image->rows-y),image->rows);
1235               if (status == MagickFalse)
1236                 break;
1237             }
1238         }
1239         break;
1240       }
1241       case 24:
1242       {
1243         /*
1244           Convert DirectColor scanline.
1245         */
1246         bytes_per_line=4*((image->columns*24+31)/32);
1247         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1248         {
1249           p=pixels+(image->rows-y-1)*bytes_per_line;
1250           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1251           if (q == (Quantum *) NULL)
1252             break;
1253           for (x=0; x < (ssize_t) image->columns; x++)
1254           {
1255             SetPixelBlue(image,ScaleCharToQuantum(*p++),q);
1256             SetPixelGreen(image,ScaleCharToQuantum(*p++),q);
1257             SetPixelRed(image,ScaleCharToQuantum(*p++),q);
1258             SetPixelAlpha(image,OpaqueAlpha,q);
1259             q+=GetPixelChannels(image);
1260           }
1261           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1262             break;
1263           offset=(MagickOffsetType) (image->rows-y-1);
1264           if (image->previous == (Image *) NULL)
1265             {
1266               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1267                 (image->rows-y),image->rows);
1268               if (status == MagickFalse)
1269                 break;
1270             }
1271         }
1272         break;
1273       }
1274       case 32:
1275       {
1276         /*
1277           Convert bitfield encoded DirectColor scanline.
1278         */
1279         if ((bmp_info.compression != BI_RGB) &&
1280             (bmp_info.compression != BI_BITFIELDS))
1281           {
1282             pixel_info=RelinquishVirtualMemory(pixel_info);
1283             ThrowReaderException(CorruptImageError,
1284               "UnrecognizedImageCompression");
1285           }
1286         bytes_per_line=4*(image->columns);
1287         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1288         {
1289           size_t
1290             alpha,
1291             pixel;
1292
1293           p=pixels+(image->rows-y-1)*bytes_per_line;
1294           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1295           if (q == (Quantum *) NULL)
1296             break;
1297           for (x=0; x < (ssize_t) image->columns; x++)
1298           {
1299             pixel=(size_t) (*p++);
1300             pixel|=((size_t) *p++ << 8);
1301             pixel|=((size_t) *p++ << 16);
1302             pixel|=((size_t) *p++ << 24);
1303             red=((pixel & bmp_info.red_mask) << shift.red) >> 16;
1304             if (quantum_bits.red == 8)
1305               red|=(red >> 8);
1306             green=((pixel & bmp_info.green_mask) << shift.green) >> 16;
1307             if (quantum_bits.green == 8)
1308               green|=(green >> 8);
1309             blue=((pixel & bmp_info.blue_mask) << shift.blue) >> 16;
1310             if (quantum_bits.blue == 8)
1311               blue|=(blue >> 8);
1312             SetPixelRed(image,ScaleShortToQuantum((unsigned short) red),q);
1313             SetPixelGreen(image,ScaleShortToQuantum((unsigned short) green),q);
1314             SetPixelBlue(image,ScaleShortToQuantum((unsigned short) blue),q);
1315             SetPixelAlpha(image,OpaqueAlpha,q);
1316             if (image->alpha_trait != UndefinedPixelTrait)
1317               {
1318                 alpha=((pixel & bmp_info.alpha_mask) << shift.alpha) >> 16;
1319                 if (quantum_bits.alpha == 8)
1320                   alpha|=(alpha >> 8);
1321                 SetPixelAlpha(image,ScaleShortToQuantum(
1322                   (unsigned short) alpha),q);
1323               }
1324             q+=GetPixelChannels(image);
1325           }
1326           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1327             break;
1328           offset=(MagickOffsetType) (image->rows-y-1);
1329           if (image->previous == (Image *) NULL)
1330             {
1331               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1332                 (image->rows-y),image->rows);
1333               if (status == MagickFalse)
1334                 break;
1335             }
1336         }
1337         break;
1338       }
1339       default:
1340       {
1341         pixel_info=RelinquishVirtualMemory(pixel_info);
1342         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1343       }
1344     }
1345     pixel_info=RelinquishVirtualMemory(pixel_info);
1346     if (y > 0)
1347       break;
1348     if (EOFBlob(image) != MagickFalse)
1349       {
1350         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
1351           image->filename);
1352         break;
1353       }
1354     if (bmp_info.height < 0)
1355       {
1356         Image
1357           *flipped_image;
1358
1359         /*
1360           Correct image orientation.
1361         */
1362         flipped_image=FlipImage(image,exception);
1363         if (flipped_image != (Image *) NULL)
1364           {
1365             DuplicateBlob(flipped_image,image);
1366             image=DestroyImage(image);
1367             image=flipped_image;
1368           }
1369       }
1370     /*
1371       Proceed to next image.
1372     */
1373     if (image_info->number_scenes != 0)
1374       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
1375         break;
1376     *magick='\0';
1377     if (bmp_info.ba_offset != 0)
1378       {
1379         offset=SeekBlob(image,(MagickOffsetType) bmp_info.ba_offset,SEEK_SET);
1380         if (offset < 0)
1381           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1382       }
1383     count=ReadBlob(image,2,magick);
1384     if ((count == 2) && (IsBMP(magick,2) != MagickFalse))
1385       {
1386         /*
1387           Acquire next image structure.
1388         */
1389         AcquireNextImage(image_info,image,exception);
1390         if (GetNextImageInList(image) == (Image *) NULL)
1391           {
1392             image=DestroyImageList(image);
1393             return((Image *) NULL);
1394           }
1395         image=SyncNextImageInList(image);
1396         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
1397           GetBlobSize(image));
1398         if (status == MagickFalse)
1399           break;
1400       }
1401   } while (IsBMP(magick,2) != MagickFalse);
1402   (void) CloseBlob(image);
1403   return(GetFirstImageInList(image));
1404 }
1405 \f
1406 /*
1407 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1408 %                                                                             %
1409 %                                                                             %
1410 %                                                                             %
1411 %   R e g i s t e r B M P I m a g e                                           %
1412 %                                                                             %
1413 %                                                                             %
1414 %                                                                             %
1415 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1416 %
1417 %  RegisterBMPImage() adds attributes for the BMP image format to
1418 %  the list of supported formats.  The attributes include the image format
1419 %  tag, a method to read and/or write the format, whether the format
1420 %  supports the saving of more than one frame to the same file or blob,
1421 %  whether the format supports native in-memory I/O, and a brief
1422 %  description of the format.
1423 %
1424 %  The format of the RegisterBMPImage method is:
1425 %
1426 %      size_t RegisterBMPImage(void)
1427 %
1428 */
1429 ModuleExport size_t RegisterBMPImage(void)
1430 {
1431   MagickInfo
1432     *entry;
1433
1434   entry=AcquireMagickInfo("BMP","BMP","Microsoft Windows bitmap image");
1435   entry->decoder=(DecodeImageHandler *) ReadBMPImage;
1436   entry->encoder=(EncodeImageHandler *) WriteBMPImage;
1437   entry->magick=(IsImageFormatHandler *) IsBMP;
1438   entry->flags^=CoderAdjoinFlag;
1439   entry->flags|=CoderSeekableStreamFlag;
1440   (void) RegisterMagickInfo(entry);
1441   entry=AcquireMagickInfo("BMP","BMP2","Microsoft Windows bitmap image (V2)");
1442   entry->encoder=(EncodeImageHandler *) WriteBMPImage;
1443   entry->magick=(IsImageFormatHandler *) IsBMP;
1444   entry->flags^=CoderAdjoinFlag;
1445   entry->flags|=CoderSeekableStreamFlag;
1446   (void) RegisterMagickInfo(entry);
1447   entry=AcquireMagickInfo("BMP","BMP3","Microsoft Windows bitmap image (V3)");
1448   entry->encoder=(EncodeImageHandler *) WriteBMPImage;
1449   entry->magick=(IsImageFormatHandler *) IsBMP;
1450   entry->flags^=CoderAdjoinFlag;
1451   entry->flags|=CoderSeekableStreamFlag;
1452   (void) RegisterMagickInfo(entry);
1453   return(MagickImageCoderSignature);
1454 }
1455 \f
1456 /*
1457 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1458 %                                                                             %
1459 %                                                                             %
1460 %                                                                             %
1461 %   U n r e g i s t e r B M P I m a g e                                       %
1462 %                                                                             %
1463 %                                                                             %
1464 %                                                                             %
1465 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1466 %
1467 %  UnregisterBMPImage() removes format registrations made by the
1468 %  BMP module from the list of supported formats.
1469 %
1470 %  The format of the UnregisterBMPImage method is:
1471 %
1472 %      UnregisterBMPImage(void)
1473 %
1474 */
1475 ModuleExport void UnregisterBMPImage(void)
1476 {
1477   (void) UnregisterMagickInfo("BMP");
1478   (void) UnregisterMagickInfo("BMP2");
1479   (void) UnregisterMagickInfo("BMP3");
1480 }
1481 \f
1482 /*
1483 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1484 %                                                                             %
1485 %                                                                             %
1486 %                                                                             %
1487 %   W r i t e B M P I m a g e                                                 %
1488 %                                                                             %
1489 %                                                                             %
1490 %                                                                             %
1491 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1492 %
1493 %  WriteBMPImage() writes an image in Microsoft Windows bitmap encoded
1494 %  image format, version 3 for Windows or (if the image has a matte channel)
1495 %  version 4.
1496 %
1497 %  The format of the WriteBMPImage method is:
1498 %
1499 %      MagickBooleanType WriteBMPImage(const ImageInfo *image_info,
1500 %        Image *image,ExceptionInfo *exception)
1501 %
1502 %  A description of each parameter follows.
1503 %
1504 %    o image_info: the image info.
1505 %
1506 %    o image:  The image.
1507 %
1508 %    o exception: return any errors or warnings in this structure.
1509 %
1510 */
1511 static MagickBooleanType WriteBMPImage(const ImageInfo *image_info,Image *image,
1512   ExceptionInfo *exception)
1513 {
1514   BMPInfo
1515     bmp_info;
1516
1517   const char
1518     *option;
1519
1520   const StringInfo
1521     *profile;
1522
1523   MagickBooleanType
1524     have_color_info,
1525     status;
1526
1527   MagickOffsetType
1528     scene;
1529
1530   MemoryInfo
1531     *pixel_info;
1532
1533   register const Quantum
1534     *p;
1535
1536   register ssize_t
1537     i,
1538     x;
1539
1540   register unsigned char
1541     *q;
1542
1543   size_t
1544     bytes_per_line,
1545     type;
1546
1547   ssize_t
1548     y;
1549
1550   unsigned char
1551     *bmp_data,
1552     *pixels;
1553
1554   /*
1555     Open output image file.
1556   */
1557   assert(image_info != (const ImageInfo *) NULL);
1558   assert(image_info->signature == MagickCoreSignature);
1559   assert(image != (Image *) NULL);
1560   assert(image->signature == MagickCoreSignature);
1561   if (image->debug != MagickFalse)
1562     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1563   assert(exception != (ExceptionInfo *) NULL);
1564   assert(exception->signature == MagickCoreSignature);
1565   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
1566   if (status == MagickFalse)
1567     return(status);
1568   type=4;
1569   if (LocaleCompare(image_info->magick,"BMP2") == 0)
1570     type=2;
1571   else
1572     if (LocaleCompare(image_info->magick,"BMP3") == 0)
1573       type=3;
1574
1575   option=GetImageOption(image_info,"bmp:format");
1576   if (option != (char *) NULL)
1577     {
1578       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1579           "  Format=%s",option);
1580
1581       if (LocaleCompare(option,"bmp2") == 0)
1582         type=2;
1583       if (LocaleCompare(option,"bmp3") == 0)
1584         type=3;
1585       if (LocaleCompare(option,"bmp4") == 0)
1586         type=4;
1587     }
1588
1589   scene=0;
1590   do
1591   {
1592     /*
1593       Initialize BMP raster file header.
1594     */
1595     (void) TransformImageColorspace(image,sRGBColorspace,exception);
1596     (void) ResetMagickMemory(&bmp_info,0,sizeof(bmp_info));
1597     bmp_info.file_size=14+12;
1598     if (type > 2)
1599       bmp_info.file_size+=28;
1600     bmp_info.offset_bits=bmp_info.file_size;
1601     bmp_info.compression=BI_RGB;
1602     if ((image->storage_class == PseudoClass) && (image->colors > 256))
1603       (void) SetImageStorageClass(image,DirectClass,exception);
1604     if (image->storage_class != DirectClass)
1605       {
1606         /*
1607           Colormapped BMP raster.
1608         */
1609         bmp_info.bits_per_pixel=8;
1610         if (image->colors <= 2)
1611           bmp_info.bits_per_pixel=1;
1612         else
1613           if (image->colors <= 16)
1614             bmp_info.bits_per_pixel=4;
1615           else
1616             if (image->colors <= 256)
1617               bmp_info.bits_per_pixel=8;
1618         if (image_info->compression == RLECompression)
1619           bmp_info.bits_per_pixel=8;
1620         bmp_info.number_colors=1U << bmp_info.bits_per_pixel;
1621         if (image->alpha_trait != UndefinedPixelTrait)
1622           (void) SetImageStorageClass(image,DirectClass,exception);
1623         else
1624           if ((size_t) bmp_info.number_colors < image->colors)
1625             (void) SetImageStorageClass(image,DirectClass,exception);
1626           else
1627             {
1628               bmp_info.file_size+=3*(1UL << bmp_info.bits_per_pixel);
1629               bmp_info.offset_bits+=3*(1UL << bmp_info.bits_per_pixel);
1630               if (type > 2)
1631                 {
1632                   bmp_info.file_size+=(1UL << bmp_info.bits_per_pixel);
1633                   bmp_info.offset_bits+=(1UL << bmp_info.bits_per_pixel);
1634                 }
1635             }
1636       }
1637     if (image->storage_class == DirectClass)
1638       {
1639         /*
1640           Full color BMP raster.
1641         */
1642         bmp_info.number_colors=0;
1643         bmp_info.bits_per_pixel=(unsigned short)
1644           ((type > 3) && (image->alpha_trait != UndefinedPixelTrait) ? 32 : 24);
1645         bmp_info.compression=(unsigned int) ((type > 3) &&
1646           (image->alpha_trait != UndefinedPixelTrait) ?  BI_BITFIELDS : BI_RGB);
1647         if ((type == 3) && (image->alpha_trait != UndefinedPixelTrait))
1648           {
1649             option=GetImageOption(image_info,"bmp3:alpha");
1650             if (IsStringTrue(option))
1651               bmp_info.bits_per_pixel=32;
1652           }
1653       }
1654     bytes_per_line=4*((image->columns*bmp_info.bits_per_pixel+31)/32);
1655     bmp_info.ba_offset=0;
1656     profile=GetImageProfile(image,"icc");
1657     have_color_info=(image->rendering_intent != UndefinedIntent) ||
1658       (profile != (StringInfo *) NULL) || (image->gamma != 0.0) ?  MagickTrue :
1659       MagickFalse;
1660     if (type == 2)
1661       bmp_info.size=12;
1662     else
1663       if ((type == 3) || ((image->alpha_trait == UndefinedPixelTrait) &&
1664           (have_color_info == MagickFalse)))
1665         {
1666           type=3;
1667           bmp_info.size=40;
1668         }
1669       else
1670         {
1671           int
1672             extra_size;
1673
1674           bmp_info.size=108;
1675           extra_size=68;
1676           if ((image->rendering_intent != UndefinedIntent) ||
1677               (profile != (StringInfo *) NULL))
1678             {
1679               bmp_info.size=124;
1680               extra_size+=16;
1681             }
1682           bmp_info.file_size+=extra_size;
1683           bmp_info.offset_bits+=extra_size;
1684         }
1685     bmp_info.width=(ssize_t) image->columns;
1686     bmp_info.height=(ssize_t) image->rows;
1687     bmp_info.planes=1;
1688     bmp_info.image_size=(unsigned int) (bytes_per_line*image->rows);
1689     bmp_info.file_size+=bmp_info.image_size;
1690     bmp_info.x_pixels=75*39;
1691     bmp_info.y_pixels=75*39;
1692     switch (image->units)
1693     {
1694       case UndefinedResolution:
1695       case PixelsPerInchResolution:
1696       {
1697         bmp_info.x_pixels=(unsigned int) (100.0*image->resolution.x/2.54);
1698         bmp_info.y_pixels=(unsigned int) (100.0*image->resolution.y/2.54);
1699         break;
1700       }
1701       case PixelsPerCentimeterResolution:
1702       {
1703         bmp_info.x_pixels=(unsigned int) (100.0*image->resolution.x);
1704         bmp_info.y_pixels=(unsigned int) (100.0*image->resolution.y);
1705         break;
1706       }
1707     }
1708     bmp_info.colors_important=bmp_info.number_colors;
1709     /*
1710       Convert MIFF to BMP raster pixels.
1711     */
1712     pixel_info=AcquireVirtualMemory((size_t) bmp_info.image_size,
1713       sizeof(*pixels));
1714     if (pixel_info == (MemoryInfo *) NULL)
1715       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1716     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
1717     (void) ResetMagickMemory(pixels,0,(size_t) bmp_info.image_size);
1718     switch (bmp_info.bits_per_pixel)
1719     {
1720       case 1:
1721       {
1722         size_t
1723           bit,
1724           byte;
1725
1726         /*
1727           Convert PseudoClass image to a BMP monochrome image.
1728         */
1729         for (y=0; y < (ssize_t) image->rows; y++)
1730         {
1731           ssize_t
1732             offset;
1733
1734           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1735           if (p == (const Quantum *) NULL)
1736             break;
1737           q=pixels+(image->rows-y-1)*bytes_per_line;
1738           bit=0;
1739           byte=0;
1740           for (x=0; x < (ssize_t) image->columns; x++)
1741           {
1742             byte<<=1;
1743             byte|=GetPixelIndex(image,p) != 0 ? 0x01 : 0x00;
1744             bit++;
1745             if (bit == 8)
1746               {
1747                 *q++=(unsigned char) byte;
1748                 bit=0;
1749                 byte=0;
1750               }
1751              p+=GetPixelChannels(image);
1752            }
1753            if (bit != 0)
1754              {
1755                *q++=(unsigned char) (byte << (8-bit));
1756                x++;
1757              }
1758           offset=(ssize_t) (image->columns+7)/8;
1759           for (x=offset; x < (ssize_t) bytes_per_line; x++)
1760             *q++=0x00;
1761           if (image->previous == (Image *) NULL)
1762             {
1763               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1764                 image->rows);
1765               if (status == MagickFalse)
1766                 break;
1767             }
1768         }
1769         break;
1770       }
1771       case 4:
1772       {
1773         size_t
1774           byte,
1775           nibble;
1776
1777         ssize_t
1778           offset;
1779
1780         /*
1781           Convert PseudoClass image to a BMP monochrome image.
1782         */
1783         for (y=0; y < (ssize_t) image->rows; y++)
1784         {
1785           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1786           if (p == (const Quantum *) NULL)
1787             break;
1788           q=pixels+(image->rows-y-1)*bytes_per_line;
1789           nibble=0;
1790           byte=0;
1791           for (x=0; x < (ssize_t) image->columns; x++)
1792           {
1793             byte<<=4;
1794             byte|=((size_t) GetPixelIndex(image,p) & 0x0f);
1795             nibble++;
1796             if (nibble == 2)
1797               {
1798                 *q++=(unsigned char) byte;
1799                 nibble=0;
1800                 byte=0;
1801               }
1802             p+=GetPixelChannels(image);
1803           }
1804           if (nibble != 0)
1805             {
1806               *q++=(unsigned char) (byte << 4);
1807               x++;
1808             }
1809           offset=(ssize_t) (image->columns+1)/2;
1810           for (x=offset; x < (ssize_t) bytes_per_line; x++)
1811             *q++=0x00;
1812           if (image->previous == (Image *) NULL)
1813             {
1814               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1815                 image->rows);
1816               if (status == MagickFalse)
1817                 break;
1818             }
1819         }
1820         break;
1821       }
1822       case 8:
1823       {
1824         /*
1825           Convert PseudoClass packet to BMP pixel.
1826         */
1827         for (y=0; y < (ssize_t) image->rows; y++)
1828         {
1829           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1830           if (p == (const Quantum *) NULL)
1831             break;
1832           q=pixels+(image->rows-y-1)*bytes_per_line;
1833           for (x=0; x < (ssize_t) image->columns; x++)
1834           {
1835             *q++=(unsigned char) GetPixelIndex(image,p);
1836             p+=GetPixelChannels(image);
1837           }
1838           for ( ; x < (ssize_t) bytes_per_line; x++)
1839             *q++=0x00;
1840           if (image->previous == (Image *) NULL)
1841             {
1842               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1843                 image->rows);
1844               if (status == MagickFalse)
1845                 break;
1846             }
1847         }
1848         break;
1849       }
1850       case 24:
1851       {
1852         /*
1853           Convert DirectClass packet to BMP BGR888.
1854         */
1855         for (y=0; y < (ssize_t) image->rows; y++)
1856         {
1857           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1858           if (p == (const Quantum *) NULL)
1859             break;
1860           q=pixels+(image->rows-y-1)*bytes_per_line;
1861           for (x=0; x < (ssize_t) image->columns; x++)
1862           {
1863             *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1864             *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1865             *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1866             p+=GetPixelChannels(image);
1867           }
1868           for (x=3L*(ssize_t) image->columns; x < (ssize_t) bytes_per_line; x++)
1869             *q++=0x00;
1870           if (image->previous == (Image *) NULL)
1871             {
1872               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1873                 image->rows);
1874               if (status == MagickFalse)
1875                 break;
1876             }
1877         }
1878         break;
1879       }
1880       case 32:
1881       {
1882         /*
1883           Convert DirectClass packet to ARGB8888 pixel.
1884         */
1885         for (y=0; y < (ssize_t) image->rows; y++)
1886         {
1887           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1888           if (p == (const Quantum *) NULL)
1889             break;
1890           q=pixels+(image->rows-y-1)*bytes_per_line;
1891           for (x=0; x < (ssize_t) image->columns; x++)
1892           {
1893             *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1894             *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1895             *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1896             *q++=ScaleQuantumToChar(GetPixelAlpha(image,p));
1897             p+=GetPixelChannels(image);
1898           }
1899           if (image->previous == (Image *) NULL)
1900             {
1901               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1902                 image->rows);
1903               if (status == MagickFalse)
1904                 break;
1905             }
1906         }
1907         break;
1908       }
1909     }
1910     if ((type > 2) && (bmp_info.bits_per_pixel == 8))
1911       if (image_info->compression != NoCompression)
1912         {
1913           MemoryInfo
1914             *rle_info;
1915
1916           /*
1917             Convert run-length encoded raster pixels.
1918           */
1919           rle_info=AcquireVirtualMemory((size_t) (2*(bytes_per_line+2)+2),
1920             (image->rows+2)*sizeof(*pixels));
1921           if (rle_info == (MemoryInfo *) NULL)
1922             {
1923               pixel_info=RelinquishVirtualMemory(pixel_info);
1924               ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1925             }
1926           bmp_data=(unsigned char *) GetVirtualMemoryBlob(rle_info);
1927           bmp_info.file_size-=bmp_info.image_size;
1928           bmp_info.image_size=(unsigned int) EncodeImage(image,bytes_per_line,
1929             pixels,bmp_data);
1930           bmp_info.file_size+=bmp_info.image_size;
1931           pixel_info=RelinquishVirtualMemory(pixel_info);
1932           pixel_info=rle_info;
1933           pixels=bmp_data;
1934           bmp_info.compression=BI_RLE8;
1935         }
1936     /*
1937       Write BMP for Windows, all versions, 14-byte header.
1938     */
1939     if (image->debug != MagickFalse)
1940       {
1941         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1942           "   Writing BMP version %.20g datastream",(double) type);
1943         if (image->storage_class == DirectClass)
1944           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1945             "   Storage class=DirectClass");
1946         else
1947           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1948             "   Storage class=PseudoClass");
1949         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1950           "   Image depth=%.20g",(double) image->depth);
1951         if (image->alpha_trait != UndefinedPixelTrait)
1952           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1953             "   Matte=True");
1954         else
1955           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1956             "   Matte=MagickFalse");
1957         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1958           "   BMP bits_per_pixel=%.20g",(double) bmp_info.bits_per_pixel);
1959         switch ((int) bmp_info.compression)
1960         {
1961            case BI_RGB:
1962            {
1963              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1964                "   Compression=BI_RGB");
1965              break;
1966            }
1967            case BI_RLE8:
1968            {
1969              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1970                "   Compression=BI_RLE8");
1971              break;
1972            }
1973            case BI_BITFIELDS:
1974            {
1975              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1976                "   Compression=BI_BITFIELDS");
1977              break;
1978            }
1979            default:
1980            {
1981              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1982                "   Compression=UNKNOWN (%lu)",bmp_info.compression);
1983              break;
1984            }
1985         }
1986         if (bmp_info.number_colors == 0)
1987           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1988             "   Number_colors=unspecified");
1989         else
1990           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1991             "   Number_colors=%lu",bmp_info.number_colors);
1992       }
1993     (void) WriteBlob(image,2,(unsigned char *) "BM");
1994     (void) WriteBlobLSBLong(image,bmp_info.file_size);
1995     (void) WriteBlobLSBLong(image,bmp_info.ba_offset);  /* always 0 */
1996     (void) WriteBlobLSBLong(image,bmp_info.offset_bits);
1997     if (type == 2)
1998       {
1999         /*
2000           Write 12-byte version 2 bitmap header.
2001         */
2002         (void) WriteBlobLSBLong(image,bmp_info.size);
2003         (void) WriteBlobLSBSignedShort(image,bmp_info.width);
2004         (void) WriteBlobLSBSignedShort(image,bmp_info.height);
2005         (void) WriteBlobLSBShort(image,bmp_info.planes);
2006         (void) WriteBlobLSBShort(image,bmp_info.bits_per_pixel);
2007       }
2008     else
2009       {
2010         /*
2011           Write 40-byte version 3+ bitmap header.
2012         */
2013         (void) WriteBlobLSBLong(image,bmp_info.size);
2014         (void) WriteBlobLSBSignedLong(image,bmp_info.width);
2015         (void) WriteBlobLSBSignedLong(image,bmp_info.height);
2016         (void) WriteBlobLSBShort(image,bmp_info.planes);
2017         (void) WriteBlobLSBShort(image,bmp_info.bits_per_pixel);
2018         (void) WriteBlobLSBLong(image,bmp_info.compression);
2019         (void) WriteBlobLSBLong(image,bmp_info.image_size);
2020         (void) WriteBlobLSBLong(image,bmp_info.x_pixels);
2021         (void) WriteBlobLSBLong(image,bmp_info.y_pixels);
2022         (void) WriteBlobLSBLong(image,bmp_info.number_colors);
2023         (void) WriteBlobLSBLong(image,bmp_info.colors_important);
2024       }
2025     if ((type > 3) && ((image->alpha_trait != UndefinedPixelTrait) ||
2026         (have_color_info != MagickFalse)))
2027       {
2028         /*
2029           Write the rest of the 108-byte BMP Version 4 header.
2030         */
2031         (void) WriteBlobLSBLong(image,0x00ff0000U);  /* Red mask */
2032         (void) WriteBlobLSBLong(image,0x0000ff00U);  /* Green mask */
2033         (void) WriteBlobLSBLong(image,0x000000ffU);  /* Blue mask */
2034         (void) WriteBlobLSBLong(image,0xff000000U);  /* Alpha mask */
2035         (void) WriteBlobLSBLong(image,0x73524742U);  /* sRGB */
2036         (void) WriteBlobLSBLong(image,(unsigned int)
2037           (image->chromaticity.red_primary.x*0x40000000));
2038         (void) WriteBlobLSBLong(image,(unsigned int)
2039           (image->chromaticity.red_primary.y*0x40000000));
2040         (void) WriteBlobLSBLong(image,(unsigned int)
2041           ((1.000f-(image->chromaticity.red_primary.x+
2042           image->chromaticity.red_primary.y))*0x40000000));
2043         (void) WriteBlobLSBLong(image,(unsigned int)
2044           (image->chromaticity.green_primary.x*0x40000000));
2045         (void) WriteBlobLSBLong(image,(unsigned int)
2046           (image->chromaticity.green_primary.y*0x40000000));
2047         (void) WriteBlobLSBLong(image,(unsigned int)
2048           ((1.000f-(image->chromaticity.green_primary.x+
2049           image->chromaticity.green_primary.y))*0x40000000));
2050         (void) WriteBlobLSBLong(image,(unsigned int)
2051           (image->chromaticity.blue_primary.x*0x40000000));
2052         (void) WriteBlobLSBLong(image,(unsigned int)
2053           (image->chromaticity.blue_primary.y*0x40000000));
2054         (void) WriteBlobLSBLong(image,(unsigned int)
2055           ((1.000f-(image->chromaticity.blue_primary.x+
2056           image->chromaticity.blue_primary.y))*0x40000000));
2057         (void) WriteBlobLSBLong(image,(unsigned int)
2058           (bmp_info.gamma_scale.x*0x10000));
2059         (void) WriteBlobLSBLong(image,(unsigned int)
2060           (bmp_info.gamma_scale.y*0x10000));
2061         (void) WriteBlobLSBLong(image,(unsigned int)
2062           (bmp_info.gamma_scale.z*0x10000));
2063         if ((image->rendering_intent != UndefinedIntent) ||
2064             (profile != (StringInfo *) NULL))
2065           {
2066             ssize_t
2067               intent;
2068
2069             switch ((int) image->rendering_intent)
2070             {
2071               case SaturationIntent:
2072               {
2073                 intent=LCS_GM_BUSINESS;
2074                 break;
2075               }
2076               case RelativeIntent:
2077               {
2078                 intent=LCS_GM_GRAPHICS;
2079                 break;
2080               }
2081               case PerceptualIntent:
2082               {
2083                 intent=LCS_GM_IMAGES;
2084                 break;
2085               }
2086               case AbsoluteIntent:
2087               {
2088                 intent=LCS_GM_ABS_COLORIMETRIC;
2089                 break;
2090               }
2091               default:
2092               {
2093                 intent=0;
2094                 break;
2095               }
2096             }
2097             (void) WriteBlobLSBLong(image,(unsigned int) intent);
2098             (void) WriteBlobLSBLong(image,0x00);  /* dummy profile data */
2099             (void) WriteBlobLSBLong(image,0x00);  /* dummy profile length */
2100             (void) WriteBlobLSBLong(image,0x00);  /* reserved */
2101           }
2102       }
2103     if (image->storage_class == PseudoClass)
2104       {
2105         unsigned char
2106           *bmp_colormap;
2107
2108         /*
2109           Dump colormap to file.
2110         */
2111         if (image->debug != MagickFalse)
2112           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2113             "  Colormap: %.20g entries",(double) image->colors);
2114         bmp_colormap=(unsigned char *) AcquireQuantumMemory((size_t) (1UL <<
2115           bmp_info.bits_per_pixel),4*sizeof(*bmp_colormap));
2116         if (bmp_colormap == (unsigned char *) NULL)
2117           ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
2118         q=bmp_colormap;
2119         for (i=0; i < (ssize_t) MagickMin((ssize_t) image->colors,(ssize_t) bmp_info.number_colors); i++)
2120         {
2121           *q++=ScaleQuantumToChar(ClampToQuantum(image->colormap[i].blue));
2122           *q++=ScaleQuantumToChar(ClampToQuantum(image->colormap[i].green));
2123           *q++=ScaleQuantumToChar(ClampToQuantum(image->colormap[i].red));
2124           if (type > 2)
2125             *q++=(unsigned char) 0x0;
2126         }
2127         for ( ; i < (ssize_t) (1UL << bmp_info.bits_per_pixel); i++)
2128         {
2129           *q++=(unsigned char) 0x00;
2130           *q++=(unsigned char) 0x00;
2131           *q++=(unsigned char) 0x00;
2132           if (type > 2)
2133             *q++=(unsigned char) 0x00;
2134         }
2135         if (type <= 2)
2136           (void) WriteBlob(image,(size_t) (3*(1L << bmp_info.bits_per_pixel)),
2137             bmp_colormap);
2138         else
2139           (void) WriteBlob(image,(size_t) (4*(1L << bmp_info.bits_per_pixel)),
2140             bmp_colormap);
2141         bmp_colormap=(unsigned char *) RelinquishMagickMemory(bmp_colormap);
2142       }
2143     if (image->debug != MagickFalse)
2144       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2145         "  Pixels:  %lu bytes",bmp_info.image_size);
2146     (void) WriteBlob(image,(size_t) bmp_info.image_size,pixels);
2147     pixel_info=RelinquishVirtualMemory(pixel_info);
2148     if (GetNextImageInList(image) == (Image *) NULL)
2149       break;
2150     image=SyncNextImageInList(image);
2151     status=SetImageProgress(image,SaveImagesTag,scene++,
2152       GetImageListLength(image));
2153     if (status == MagickFalse)
2154       break;
2155   } while (image_info->adjoin != MagickFalse);
2156   (void) CloseBlob(image);
2157   return(MagickTrue);
2158 }