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