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 1999-2015 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     red;
 539
 540   ssize_t
 541     count,
 542     y;
 543
 544   unsigned char
 545     magick[12],
 546     *pixels;
 547
 548   /*
 549     Open image file.
 550   */
 551   assert(image_info != (const ImageInfo *) NULL);
 552   assert(image_info->signature == MagickSignature);
 553   if (image_info->debug != MagickFalse)
 554     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 555       image_info->filename);
 556   assert(exception != (ExceptionInfo *) NULL);
 557   assert(exception->signature == MagickSignature);
 558   image=AcquireImage(image_info,exception);
 559   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 560   if (status == MagickFalse)
 561     {
 562       image=DestroyImageList(image);
 563       return((Image *) NULL);
 564     }
 565   /*
 566     Determine if this a BMP file.
 567   */
 568   (void) ResetMagickMemory(&bmp_info,0,sizeof(bmp_info));
 569   bmp_info.ba_offset=0;
 570   start_position=0;
 571   count=ReadBlob(image,2,magick);
 572   do
 573   {
 574     PixelInfo
 575       quantum_bits;
 576
 577     PixelPacket
 578       shift;
 579
 580     size_t
 581       profile_data,
 582       profile_size;
 583
 584     /*
 585       Verify BMP identifier.
 586     */
 587     if (bmp_info.ba_offset == 0)
 588       start_position=TellBlob(image)-2;
 589     bmp_info.ba_offset=0;
 590     while (LocaleNCompare((char *) magick,"BA",2) == 0)
 591     {
 592       bmp_info.file_size=ReadBlobLSBLong(image);
 593       bmp_info.ba_offset=ReadBlobLSBLong(image);
 594       bmp_info.offset_bits=ReadBlobLSBLong(image);
 595       count=ReadBlob(image,2,magick);
 596       if (count != 2)
 597         break;
 598     }
 599     if (image->debug != MagickFalse)
 600       (void) LogMagickEvent(CoderEvent,GetMagickModule(),"  Magick: %c%c",
 601         magick[0],magick[1]);
 602     if ((count == 0) || ((LocaleNCompare((char *) magick,"BM",2) != 0) &&
 603         (LocaleNCompare((char *) magick,"CI",2) != 0)))
 604       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 605     bmp_info.file_size=ReadBlobLSBLong(image);
 606     (void) ReadBlobLSBLong(image);
 607     bmp_info.offset_bits=ReadBlobLSBLong(image);
 608     bmp_info.size=ReadBlobLSBLong(image);
 609     if (image->debug != MagickFalse)
 610       (void) LogMagickEvent(CoderEvent,GetMagickModule(),"  BMP size: %u",
 611         bmp_info.size);
 612     if (bmp_info.size == 12)
 613       {
 614         /*
 615           OS/2 BMP image file.
 616         */
 617         (void) CopyMagickString(image->magick,"BMP2",MaxTextExtent);
 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         else
 774           (void) CopyMagickString(image->magick,"BMP3",MaxTextExtent);
 775
 776         if (bmp_info.size > 108)
 777           {
 778             size_t
 779               intent;
 780
 781             /*
 782               Read BMP Version 5 color management information.
 783             */
 784             intent=ReadBlobLSBLong(image);
 785             switch ((int) intent)
 786             {
 787               case LCS_GM_BUSINESS:
 788               {
 789                 image->rendering_intent=SaturationIntent;
 790                 break;
 791               }
 792               case LCS_GM_GRAPHICS:
 793               {
 794                 image->rendering_intent=RelativeIntent;
 795                 break;
 796               }
 797               case LCS_GM_IMAGES:
 798               {
 799                 image->rendering_intent=PerceptualIntent;
 800                 break;
 801               }
 802               case LCS_GM_ABS_COLORIMETRIC:
 803               {
 804                 image->rendering_intent=AbsoluteIntent;
 805                 break;
 806               }
 807             }
 808             profile_data=ReadBlobLSBLong(image);
 809             profile_size=ReadBlobLSBLong(image);
 810             (void) profile_data;
 811             (void) profile_size;
 812             (void) ReadBlobLSBLong(image);  /* Reserved byte */
 813           }
 814       }
 815     if ((MagickSizeType) bmp_info.file_size > GetBlobSize(image))
 816       (void) ThrowMagickException(exception,GetMagickModule(),CorruptImageError,
 817         "LengthAndFilesizeDoNotMatch","`%s'",image->filename);
 818     else
 819       if ((MagickSizeType) bmp_info.file_size < GetBlobSize(image))
 820         (void) ThrowMagickException(exception,GetMagickModule(),
 821           CorruptImageWarning,"LengthAndFilesizeDoNotMatch","`%s'",
 822           image->filename);
 823     if (bmp_info.width <= 0)
 824       ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
 825     if (bmp_info.height == 0)
 826       ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
 827     if (bmp_info.planes != 1)
 828       ThrowReaderException(CorruptImageError,"StaticPlanesValueNotEqualToOne");
 829     if ((bmp_info.bits_per_pixel != 1) && (bmp_info.bits_per_pixel != 4) &&
 830         (bmp_info.bits_per_pixel != 8) && (bmp_info.bits_per_pixel != 16) &&
 831         (bmp_info.bits_per_pixel != 24) && (bmp_info.bits_per_pixel != 32))
 832       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 833     if (bmp_info.bits_per_pixel < 16 &&
 834         bmp_info.number_colors > (1U << bmp_info.bits_per_pixel))
 835       {
 836         ThrowReaderException(CorruptImageError,
 837             "UnrecognizedNumberOfColors");
 838       }
 839     if ((bmp_info.compression == 1) && (bmp_info.bits_per_pixel != 8))
 840       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 841     if ((bmp_info.compression == 2) && (bmp_info.bits_per_pixel != 4))
 842       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 843     if ((bmp_info.compression == 3) && (bmp_info.bits_per_pixel < 16))
 844       ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
 845     switch (bmp_info.compression)
 846     {
 847       case BI_RGB:
 848       case BI_RLE8:
 849       case BI_RLE4:
 850       case BI_BITFIELDS:
 851         break;
 852       case BI_JPEG:
 853         ThrowReaderException(CoderError,"JPEGCompressNotSupported");
 854       case BI_PNG:
 855         ThrowReaderException(CoderError,"PNGCompressNotSupported");
 856       default:
 857         ThrowReaderException(CorruptImageError,"UnrecognizedImageCompression");
 858     }
 859     image->columns=(size_t) MagickAbsoluteValue(bmp_info.width);
 860     image->rows=(size_t) MagickAbsoluteValue(bmp_info.height);
 861     image->depth=bmp_info.bits_per_pixel <= 8 ? bmp_info.bits_per_pixel : 8;
 862     image->alpha_trait=((bmp_info.alpha_mask != 0) &&
 863       (bmp_info.compression == BI_BITFIELDS)) ? BlendPixelTrait :
 864       UndefinedPixelTrait;
 865     if (bmp_info.bits_per_pixel < 16)
 866       {
 867         size_t
 868           one;
 869
 870         image->storage_class=PseudoClass;
 871         image->colors=bmp_info.number_colors;
 872         one=1;
 873         if (image->colors == 0)
 874           image->colors=one << bmp_info.bits_per_pixel;
 875       }
 876     if (image->storage_class == PseudoClass)
 877       {
 878         unsigned char
 879           *bmp_colormap;
 880
 881         size_t
 882           packet_size;
 883
 884         /*
 885           Read BMP raster colormap.
 886         */
 887         if (image->debug != MagickFalse)
 888           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 889             "  Reading colormap of %.20g colors",(double) image->colors);
 890         if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 891           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 892         bmp_colormap=(unsigned char *) AcquireQuantumMemory((size_t)
 893           image->colors,4*sizeof(*bmp_colormap));
 894         if (bmp_colormap == (unsigned char *) NULL)
 895           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 896         if ((bmp_info.size == 12) || (bmp_info.size == 64))
 897           packet_size=3;
 898         else
 899           packet_size=4;
 900         offset=SeekBlob(image,start_position+14+bmp_info.size,SEEK_SET);
 901         if (offset < 0)
 902           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 903         count=ReadBlob(image,packet_size*image->colors,bmp_colormap);
 904         if (count != (ssize_t) (packet_size*image->colors))
 905           ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
 906         p=bmp_colormap;
 907         for (i=0; i < (ssize_t) image->colors; i++)
 908         {
 909           image->colormap[i].blue=(MagickRealType) ScaleCharToQuantum(*p++);
 910           image->colormap[i].green=(MagickRealType) ScaleCharToQuantum(*p++);
 911           image->colormap[i].red=(MagickRealType) ScaleCharToQuantum(*p++);
 912           if (packet_size == 4)
 913             p++;
 914         }
 915         bmp_colormap=(unsigned char *) RelinquishMagickMemory(bmp_colormap);
 916       }
 917     image->resolution.x=(double) bmp_info.x_pixels/100.0;
 918     image->resolution.y=(double) bmp_info.y_pixels/100.0;
 919     image->units=PixelsPerCentimeterResolution;
 920     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 921       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 922         break;
 923     status=SetImageExtent(image,image->columns,image->rows,exception);
 924     if (status == MagickFalse)
 925       return(DestroyImageList(image));
 926     /*
 927       Read image data.
 928     */
 929     offset=SeekBlob(image,start_position+bmp_info.offset_bits,SEEK_SET);
 930     if (offset < 0)
 931       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 932     if (bmp_info.compression == BI_RLE4)
 933       bmp_info.bits_per_pixel<<=1;
 934     bytes_per_line=4*((image->columns*bmp_info.bits_per_pixel+31)/32);
 935     length=(size_t) bytes_per_line*image->rows;
 936     pixel_info=AcquireVirtualMemory((size_t) image->rows,
 937       MagickMax(bytes_per_line,image->columns+256UL)*sizeof(*pixels));
 938     if (pixel_info == (MemoryInfo *) NULL)
 939       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 940     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
 941     if ((bmp_info.compression == BI_RGB) ||
 942         (bmp_info.compression == BI_BITFIELDS))
 943       {
 944         if (image->debug != MagickFalse)
 945           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 946             "  Reading pixels (%.20g bytes)",(double) length);
 947         count=ReadBlob(image,length,pixels);
 948         if (count != (ssize_t) length)
 949           {
 950             pixel_info=RelinquishVirtualMemory(pixel_info);
 951             ThrowReaderException(CorruptImageError,
 952               "InsufficientImageDataInFile");
 953           }
 954       }
 955     else
 956       {
 957         /*
 958           Convert run-length encoded raster pixels.
 959         */
 960         status=DecodeImage(image,bmp_info.compression,pixels);
 961         if (status == MagickFalse)
 962           {
 963             pixel_info=RelinquishVirtualMemory(pixel_info);
 964             ThrowReaderException(CorruptImageError,
 965               "UnableToRunlengthDecodeImage");
 966           }
 967       }
 968     /*
 969       Convert BMP raster image to pixel packets.
 970     */
 971     if (bmp_info.compression == BI_RGB)
 972       {
 973         /*
 974           We should ignore the alpha value in BMP3 files but there have been
 975           reports about 32 bit files with alpha. We do a quick check to see if
 976           the alpha channel contains a value that is not zero (default value).
 977           If we find a non zero value we asume the program that wrote the file
 978           wants to use the alpha channel.
 979         */
 980         if ((image->alpha_trait != BlendPixelTrait) && (bmp_info.size == 40) &&
 981             (bmp_info.bits_per_pixel == 32))
 982           {
 983             bytes_per_line=4*(image->columns);
 984             for (y=(ssize_t) image->rows-1; y >= 0; y--)
 985             {
 986               p=pixels+(image->rows-y-1)*bytes_per_line;
 987               for (x=0; x < (ssize_t) image->columns; x++)
 988               {
 989                 if (*(p+3) != 0)
 990                   {
 991                     image->alpha_trait=BlendPixelTrait;
 992                     y=-1;
 993                     break;
 994                   }
 995                 p+=4;
 996               }
 997             }
 998           }
 999         bmp_info.alpha_mask=image->alpha_trait == BlendPixelTrait ?
1000           0xff000000U : 0U;
1001         bmp_info.red_mask=0x00ff0000U;
1002         bmp_info.green_mask=0x0000ff00U;
1003         bmp_info.blue_mask=0x000000ffU;
1004         if (bmp_info.bits_per_pixel == 16)
1005           {
1006             /*
1007               RGB555.
1008             */
1009             bmp_info.red_mask=0x00007c00U;
1010             bmp_info.green_mask=0x000003e0U;
1011             bmp_info.blue_mask=0x0000001fU;
1012           }
1013       }
1014     if ((bmp_info.bits_per_pixel == 16) || (bmp_info.bits_per_pixel == 32))
1015       {
1016         register size_t
1017           sample;
1018
1019         /*
1020           Get shift and quantum bits info from bitfield masks.
1021         */
1022         (void) ResetMagickMemory(&shift,0,sizeof(shift));
1023         (void) ResetMagickMemory(&quantum_bits,0,sizeof(quantum_bits));
1024         if (bmp_info.red_mask != 0)
1025           while (((bmp_info.red_mask << shift.red) & 0x80000000UL) == 0)
1026             shift.red++;
1027         if (bmp_info.green_mask != 0)
1028           while (((bmp_info.green_mask << shift.green) & 0x80000000UL) == 0)
1029             shift.green++;
1030         if (bmp_info.blue_mask != 0)
1031           while (((bmp_info.blue_mask << shift.blue) & 0x80000000UL) == 0)
1032             shift.blue++;
1033         if (bmp_info.alpha_mask != 0)
1034           while (((bmp_info.alpha_mask << shift.alpha) & 0x80000000UL) == 0)
1035             shift.alpha++;
1036         sample=shift.red;
1037         while (((bmp_info.red_mask << sample) & 0x80000000UL) != 0)
1038           sample++;
1039         quantum_bits.red=(MagickRealType) (sample-shift.red);
1040         sample=shift.green;
1041         while (((bmp_info.green_mask << sample) & 0x80000000UL) != 0)
1042           sample++;
1043         quantum_bits.green=(MagickRealType) (sample-shift.green);
1044         sample=shift.blue;
1045         while (((bmp_info.blue_mask << sample) & 0x80000000UL) != 0)
1046           sample++;
1047         quantum_bits.blue=(MagickRealType) (sample-shift.blue);
1048         sample=shift.alpha;
1049         while (((bmp_info.alpha_mask << sample) & 0x80000000UL) != 0)
1050           sample++;
1051         quantum_bits.alpha=(MagickRealType) (sample-shift.alpha);
1052       }
1053     switch (bmp_info.bits_per_pixel)
1054     {
1055       case 1:
1056       {
1057         /*
1058           Convert bitmap scanline.
1059         */
1060         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1061         {
1062           p=pixels+(image->rows-y-1)*bytes_per_line;
1063           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1064           if (q == (Quantum *) NULL)
1065             break;
1066           for (x=0; x < ((ssize_t) image->columns-7); x+=8)
1067           {
1068             for (bit=0; bit < 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 ((image->columns % 8) != 0)
1077             {
1078               for (bit=0; bit < (image->columns % 8); bit++)
1079               {
1080                 index=(Quantum) (((*p) & (0x80 >> bit)) != 0 ? 0x01 : 0x00);
1081                 SetPixelIndex(image,index,q);
1082                 q+=GetPixelChannels(image);
1083               }
1084               p++;
1085             }
1086           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1087             break;
1088           if (image->previous == (Image *) NULL)
1089             {
1090               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1091                 (image->rows-y),image->rows);
1092               if (status == MagickFalse)
1093                 break;
1094             }
1095         }
1096         (void) SyncImage(image,exception);
1097         break;
1098       }
1099       case 4:
1100       {
1101         /*
1102           Convert PseudoColor scanline.
1103         */
1104         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1105         {
1106           p=pixels+(image->rows-y-1)*bytes_per_line;
1107           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1108           if (q == (Quantum *) NULL)
1109             break;
1110           for (x=0; x < ((ssize_t) image->columns-1); x+=2)
1111           {
1112             index=ConstrainColormapIndex(image,(*p >> 4) & 0x0f,exception);
1113             SetPixelIndex(image,index,q);
1114             q+=GetPixelChannels(image);
1115             index=ConstrainColormapIndex(image,*p & 0x0f,exception);
1116             SetPixelIndex(image,index,q);
1117             q+=GetPixelChannels(image);
1118             p++;
1119           }
1120           if ((image->columns % 2) != 0)
1121             {
1122               index=ConstrainColormapIndex(image,(*p >> 4) & 0xf,exception);
1123               SetPixelIndex(image,index,q);
1124               q+=GetPixelChannels(image);
1125               p++;
1126             }
1127           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1128             break;
1129           if (image->previous == (Image *) NULL)
1130             {
1131               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1132                 (image->rows-y),image->rows);
1133               if (status == MagickFalse)
1134                 break;
1135             }
1136         }
1137         (void) SyncImage(image,exception);
1138         break;
1139       }
1140       case 8:
1141       {
1142         /*
1143           Convert PseudoColor scanline.
1144         */
1145         if ((bmp_info.compression == BI_RLE8) ||
1146             (bmp_info.compression == BI_RLE4))
1147           bytes_per_line=image->columns;
1148         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1149         {
1150           p=pixels+(image->rows-y-1)*bytes_per_line;
1151           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1152           if (q == (Quantum *) NULL)
1153             break;
1154           for (x=(ssize_t) image->columns; x != 0; --x)
1155           {
1156             index=ConstrainColormapIndex(image,*p++,exception);
1157             SetPixelIndex(image,index,q);
1158             q+=GetPixelChannels(image);
1159           }
1160           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1161             break;
1162           offset=(MagickOffsetType) (image->rows-y-1);
1163           if (image->previous == (Image *) NULL)
1164             {
1165               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1166                 (image->rows-y),image->rows);
1167               if (status == MagickFalse)
1168                 break;
1169             }
1170         }
1171         (void) SyncImage(image,exception);
1172         break;
1173       }
1174       case 16:
1175       {
1176         size_t
1177           alpha,
1178           pixel;
1179
1180         /*
1181           Convert bitfield encoded 16-bit PseudoColor scanline.
1182         */
1183         if (bmp_info.compression != BI_RGB &&
1184             bmp_info.compression != BI_BITFIELDS)
1185           {
1186             pixel_info=RelinquishVirtualMemory(pixel_info);
1187             ThrowReaderException(CorruptImageError,
1188               "UnrecognizedImageCompression");
1189           }
1190         bytes_per_line=2*(image->columns+image->columns % 2);
1191         image->storage_class=DirectClass;
1192         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1193         {
1194           p=pixels+(image->rows-y-1)*bytes_per_line;
1195           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1196           if (q == (Quantum *) NULL)
1197             break;
1198           for (x=0; x < (ssize_t) image->columns; x++)
1199           {
1200             pixel=(size_t) (*p++);
1201             pixel|=(*p++) << 8;
1202             red=((pixel & bmp_info.red_mask) << shift.red) >> 16;
1203             if (quantum_bits.red == 5)
1204               red|=((red & 0xe000) >> 5);
1205             if (quantum_bits.red <= 8)
1206               red|=((red & 0xff00) >> 8);
1207             green=((pixel & bmp_info.green_mask) << shift.green) >> 16;
1208             if (quantum_bits.green == 5)
1209               green|=((green & 0xe000) >> 5);
1210             if (quantum_bits.green == 6)
1211               green|=((green & 0xc000) >> 6);
1212             if (quantum_bits.green <= 8)
1213               green|=((green & 0xff00) >> 8);
1214             blue=((pixel & bmp_info.blue_mask) << shift.blue) >> 16;
1215             if (quantum_bits.blue == 5)
1216               blue|=((blue & 0xe000) >> 5);
1217             if (quantum_bits.blue <= 8)
1218               blue|=((blue & 0xff00) >> 8);
1219             SetPixelRed(image,ScaleShortToQuantum((unsigned short) red),q);
1220             SetPixelGreen(image,ScaleShortToQuantum((unsigned short) green),q);
1221             SetPixelBlue(image,ScaleShortToQuantum((unsigned short) blue),q);
1222             SetPixelAlpha(image,OpaqueAlpha,q);
1223             if (image->alpha_trait == BlendPixelTrait)
1224               {
1225                 alpha=((pixel & bmp_info.alpha_mask) << shift.alpha) >> 16;
1226                 if (quantum_bits.alpha <= 8)
1227                   alpha|=((alpha & 0xff00) >> 8);
1228                 SetPixelAlpha(image,ScaleShortToQuantum(
1229                   (unsigned short) alpha),q);
1230               }
1231             q+=GetPixelChannels(image);
1232           }
1233           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1234             break;
1235           offset=(MagickOffsetType) (image->rows-y-1);
1236           if (image->previous == (Image *) NULL)
1237             {
1238               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1239                 (image->rows-y),image->rows);
1240               if (status == MagickFalse)
1241                 break;
1242             }
1243         }
1244         break;
1245       }
1246       case 24:
1247       {
1248         /*
1249           Convert DirectColor scanline.
1250         */
1251         bytes_per_line=4*((image->columns*24+31)/32);
1252         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1253         {
1254           p=pixels+(image->rows-y-1)*bytes_per_line;
1255           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1256           if (q == (Quantum *) NULL)
1257             break;
1258           for (x=0; x < (ssize_t) image->columns; x++)
1259           {
1260             SetPixelBlue(image,ScaleCharToQuantum(*p++),q);
1261             SetPixelGreen(image,ScaleCharToQuantum(*p++),q);
1262             SetPixelRed(image,ScaleCharToQuantum(*p++),q);
1263             SetPixelAlpha(image,OpaqueAlpha,q);
1264             q+=GetPixelChannels(image);
1265           }
1266           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1267             break;
1268           offset=(MagickOffsetType) (image->rows-y-1);
1269           if (image->previous == (Image *) NULL)
1270             {
1271               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1272                 (image->rows-y),image->rows);
1273               if (status == MagickFalse)
1274                 break;
1275             }
1276         }
1277         break;
1278       }
1279       case 32:
1280       {
1281         /*
1282           Convert bitfield encoded DirectColor scanline.
1283         */
1284         if ((bmp_info.compression != BI_RGB) &&
1285             (bmp_info.compression != BI_BITFIELDS))
1286           {
1287             pixel_info=RelinquishVirtualMemory(pixel_info);
1288             ThrowReaderException(CorruptImageError,
1289               "UnrecognizedImageCompression");
1290           }
1291         bytes_per_line=4*(image->columns);
1292         for (y=(ssize_t) image->rows-1; y >= 0; y--)
1293         {
1294           size_t
1295             alpha,
1296             pixel;
1297
1298           p=pixels+(image->rows-y-1)*bytes_per_line;
1299           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
1300           if (q == (Quantum *) NULL)
1301             break;
1302           for (x=0; x < (ssize_t) image->columns; x++)
1303           {
1304             pixel=(size_t) (*p++);
1305             pixel|=((size_t) *p++ << 8);
1306             pixel|=((size_t) *p++ << 16);
1307             pixel|=((size_t) *p++ << 24);
1308             red=((pixel & bmp_info.red_mask) << shift.red) >> 16;
1309             if (quantum_bits.red == 8)
1310               red|=(red >> 8);
1311             green=((pixel & bmp_info.green_mask) << shift.green) >> 16;
1312             if (quantum_bits.green == 8)
1313               green|=(green >> 8);
1314             blue=((pixel & bmp_info.blue_mask) << shift.blue) >> 16;
1315             if (quantum_bits.blue == 8)
1316               blue|=(blue >> 8);
1317             SetPixelRed(image,ScaleShortToQuantum((unsigned short) red),q);
1318             SetPixelGreen(image,ScaleShortToQuantum((unsigned short) green),q);
1319             SetPixelBlue(image,ScaleShortToQuantum((unsigned short) blue),q);
1320             SetPixelAlpha(image,OpaqueAlpha,q);
1321             if (image->alpha_trait == BlendPixelTrait)
1322               {
1323                 alpha=((pixel & bmp_info.alpha_mask) << shift.alpha) >> 16;
1324                 if (quantum_bits.alpha == 8)
1325                   alpha|=(alpha >> 8);
1326                 SetPixelAlpha(image,ScaleShortToQuantum(
1327                   (unsigned short) alpha),q);
1328               }
1329             q+=GetPixelChannels(image);
1330           }
1331           if (SyncAuthenticPixels(image,exception) == MagickFalse)
1332             break;
1333           offset=(MagickOffsetType) (image->rows-y-1);
1334           if (image->previous == (Image *) NULL)
1335             {
1336               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType)
1337                 (image->rows-y),image->rows);
1338               if (status == MagickFalse)
1339                 break;
1340             }
1341         }
1342         break;
1343       }
1344       default:
1345       {
1346         pixel_info=RelinquishVirtualMemory(pixel_info);
1347         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1348       }
1349     }
1350     pixel_info=RelinquishVirtualMemory(pixel_info);
1351     if (EOFBlob(image) != MagickFalse)
1352       {
1353         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
1354           image->filename);
1355         break;
1356       }
1357     if (bmp_info.height < 0)
1358       {
1359         Image
1360           *flipped_image;
1361
1362         /*
1363           Correct image orientation.
1364         */
1365         flipped_image=FlipImage(image,exception);
1366         if (flipped_image != (Image *) NULL)
1367           {
1368             DuplicateBlob(flipped_image,image);
1369             image=DestroyImage(image);
1370             image=flipped_image;
1371           }
1372       }
1373     /*
1374       Proceed to next image.
1375     */
1376     if (image_info->number_scenes != 0)
1377       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
1378         break;
1379     *magick='\0';
1380     if (bmp_info.ba_offset != 0)
1381       {
1382         offset=SeekBlob(image,(MagickOffsetType) bmp_info.ba_offset,SEEK_SET);
1383         if (offset < 0)
1384           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1385       }
1386     count=ReadBlob(image,2,magick);
1387     if ((count == 2) && (IsBMP(magick,2) != MagickFalse))
1388       {
1389         /*
1390           Acquire next image structure.
1391         */
1392         AcquireNextImage(image_info,image,exception);
1393         if (GetNextImageInList(image) == (Image *) NULL)
1394           {
1395             image=DestroyImageList(image);
1396             return((Image *) NULL);
1397           }
1398         image=SyncNextImageInList(image);
1399         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
1400           GetBlobSize(image));
1401         if (status == MagickFalse)
1402           break;
1403       }
1404   } while (IsBMP(magick,2) != MagickFalse);
1405   (void) CloseBlob(image);
1406   return(GetFirstImageInList(image));
1407 }
1408 \f
1409 /*
1410 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1411 %                                                                             %
1412 %                                                                             %
1413 %                                                                             %
1414 %   R e g i s t e r B M P I m a g e                                           %
1415 %                                                                             %
1416 %                                                                             %
1417 %                                                                             %
1418 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1419 %
1420 %  RegisterBMPImage() adds attributes for the BMP image format to
1421 %  the list of supported formats.  The attributes include the image format
1422 %  tag, a method to read and/or write the format, whether the format
1423 %  supports the saving of more than one frame to the same file or blob,
1424 %  whether the format supports native in-memory I/O, and a brief
1425 %  description of the format.
1426 %
1427 %  The format of the RegisterBMPImage method is:
1428 %
1429 %      size_t RegisterBMPImage(void)
1430 %
1431 */
1432 ModuleExport size_t RegisterBMPImage(void)
1433 {
1434   MagickInfo
1435     *entry;
1436
1437   entry=SetMagickInfo("BMP");
1438   entry->decoder=(DecodeImageHandler *) ReadBMPImage;
1439   entry->encoder=(EncodeImageHandler *) WriteBMPImage;
1440   entry->magick=(IsImageFormatHandler *) IsBMP;
1441   entry->description=ConstantString("Microsoft Windows bitmap image");
1442   entry->module=ConstantString("BMP");
1443   entry->adjoin=MagickFalse;
1444   entry->seekable_stream=MagickTrue;
1445   (void) RegisterMagickInfo(entry);
1446   entry=SetMagickInfo("BMP2");
1447   entry->encoder=(EncodeImageHandler *) WriteBMPImage;
1448   entry->magick=(IsImageFormatHandler *) IsBMP;
1449   entry->description=ConstantString("Microsoft Windows bitmap image (V2)");
1450   entry->module=ConstantString("BMP");
1451   entry->adjoin=MagickFalse;
1452   entry->seekable_stream=MagickTrue;
1453   (void) RegisterMagickInfo(entry);
1454   entry=SetMagickInfo("BMP3");
1455   entry->encoder=(EncodeImageHandler *) WriteBMPImage;
1456   entry->magick=(IsImageFormatHandler *) IsBMP;
1457   entry->description=ConstantString("Microsoft Windows bitmap image (V3)");
1458   entry->module=ConstantString("BMP");
1459   entry->adjoin=MagickFalse;
1460   entry->seekable_stream=MagickTrue;
1461   (void) RegisterMagickInfo(entry);
1462   return(MagickImageCoderSignature);
1463 }
1464 \f
1465 /*
1466 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1467 %                                                                             %
1468 %                                                                             %
1469 %                                                                             %
1470 %   U n r e g i s t e r B M P I m a g e                                       %
1471 %                                                                             %
1472 %                                                                             %
1473 %                                                                             %
1474 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1475 %
1476 %  UnregisterBMPImage() removes format registrations made by the
1477 %  BMP module from the list of supported formats.
1478 %
1479 %  The format of the UnregisterBMPImage method is:
1480 %
1481 %      UnregisterBMPImage(void)
1482 %
1483 */
1484 ModuleExport void UnregisterBMPImage(void)
1485 {
1486   (void) UnregisterMagickInfo("BMP");
1487   (void) UnregisterMagickInfo("BMP2");
1488   (void) UnregisterMagickInfo("BMP3");
1489 }
1490 \f
1491 /*
1492 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1493 %                                                                             %
1494 %                                                                             %
1495 %                                                                             %
1496 %   W r i t e B M P I m a g e                                                 %
1497 %                                                                             %
1498 %                                                                             %
1499 %                                                                             %
1500 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1501 %
1502 %  WriteBMPImage() writes an image in Microsoft Windows bitmap encoded
1503 %  image format, version 3 for Windows or (if the image has a matte channel)
1504 %  version 4.
1505 %
1506 %  The format of the WriteBMPImage method is:
1507 %
1508 %      MagickBooleanType WriteBMPImage(const ImageInfo *image_info,
1509 %        Image *image,ExceptionInfo *exception)
1510 %
1511 %  A description of each parameter follows.
1512 %
1513 %    o image_info: the image info.
1514 %
1515 %    o image:  The image.
1516 %
1517 %    o exception: return any errors or warnings in this structure.
1518 %
1519 */
1520 static MagickBooleanType WriteBMPImage(const ImageInfo *image_info,Image *image,
1521   ExceptionInfo *exception)
1522 {
1523   BMPInfo
1524     bmp_info;
1525   const char
1526     *value;
1527
1528
1529   const StringInfo
1530     *profile;
1531
1532   MagickBooleanType
1533     have_color_info,
1534     status;
1535
1536   MagickOffsetType
1537     scene;
1538
1539   MemoryInfo
1540     *pixel_info;
1541
1542   register const Quantum
1543     *p;
1544
1545   register ssize_t
1546     i,
1547     x;
1548
1549   register unsigned char
1550     *q;
1551
1552   size_t
1553     bytes_per_line,
1554     type;
1555
1556   ssize_t
1557     y;
1558
1559   unsigned char
1560     *bmp_data,
1561     *pixels;
1562
1563   /*
1564     Open output image file.
1565   */
1566   assert(image_info != (const ImageInfo *) NULL);
1567   assert(image_info->signature == MagickSignature);
1568   assert(image != (Image *) NULL);
1569   assert(image->signature == MagickSignature);
1570   if (image->debug != MagickFalse)
1571     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1572   assert(exception != (ExceptionInfo *) NULL);
1573   assert(exception->signature == MagickSignature);
1574   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
1575   if (status == MagickFalse)
1576     return(status);
1577   type=4;
1578   if (LocaleCompare(image_info->magick,"BMP2") == 0)
1579     type=2;
1580   else
1581     if (LocaleCompare(image_info->magick,"BMP3") == 0)
1582       type=3;
1583
1584   value=GetImageOption(image_info,"bmp:format");
1585
1586   if (value != (char *) NULL)
1587     {
1588       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1589           "  Format=%s",value);
1590
1591       if (LocaleCompare(value,"bmp2") == 0)
1592         type=2;
1593       if (LocaleCompare(value,"bmp3") == 0)
1594         type=3;
1595       if (LocaleCompare(value,"bmp4") == 0)
1596         type=4;
1597     }
1598
1599   scene=0;
1600   do
1601   {
1602     /*
1603       Initialize BMP raster file header.
1604     */
1605     (void) TransformImageColorspace(image,sRGBColorspace,exception);
1606     (void) ResetMagickMemory(&bmp_info,0,sizeof(bmp_info));
1607     bmp_info.file_size=14+12;
1608     if (type > 2)
1609       bmp_info.file_size+=28;
1610     bmp_info.offset_bits=bmp_info.file_size;
1611     bmp_info.compression=BI_RGB;
1612     if ((image->storage_class == PseudoClass) && (image->colors > 256))
1613       (void) SetImageStorageClass(image,DirectClass,exception);
1614     if (image->storage_class != DirectClass)
1615       {
1616         /*
1617           Colormapped BMP raster.
1618         */
1619         bmp_info.bits_per_pixel=8;
1620         if (image->colors <= 2)
1621           bmp_info.bits_per_pixel=1;
1622         else
1623           if (image->colors <= 16)
1624             bmp_info.bits_per_pixel=4;
1625           else
1626             if (image->colors <= 256)
1627               bmp_info.bits_per_pixel=8;
1628         if (image_info->compression == RLECompression)
1629           bmp_info.bits_per_pixel=8;
1630         bmp_info.number_colors=1U << bmp_info.bits_per_pixel;
1631         if (image->alpha_trait == BlendPixelTrait)
1632           (void) SetImageStorageClass(image,DirectClass,exception);
1633         else
1634           if ((size_t) bmp_info.number_colors < image->colors)
1635             (void) SetImageStorageClass(image,DirectClass,exception);
1636           else
1637             {
1638               bmp_info.file_size+=3*(1UL << bmp_info.bits_per_pixel);
1639               bmp_info.offset_bits+=3*(1UL << bmp_info.bits_per_pixel);
1640               if (type > 2)
1641                 {
1642                   bmp_info.file_size+=(1UL << bmp_info.bits_per_pixel);
1643                   bmp_info.offset_bits+=(1UL << bmp_info.bits_per_pixel);
1644                 }
1645             }
1646       }
1647     if (image->storage_class == DirectClass)
1648       {
1649         /*
1650           Full color BMP raster.
1651         */
1652         bmp_info.number_colors=0;
1653         bmp_info.bits_per_pixel=(unsigned short)
1654           ((type > 3) && (image->alpha_trait == BlendPixelTrait) ? 32 : 24);
1655         bmp_info.compression=(unsigned int) ((type > 3) &&
1656           (image->alpha_trait == BlendPixelTrait) ?  BI_BITFIELDS : BI_RGB);
1657       }
1658     bytes_per_line=4*((image->columns*bmp_info.bits_per_pixel+31)/32);
1659     bmp_info.ba_offset=0;
1660     profile=GetImageProfile(image,"icc");
1661     have_color_info=(image->rendering_intent != UndefinedIntent) ||
1662       (profile != (StringInfo *) NULL) || (image->gamma != 0.0) ?  MagickTrue :
1663       MagickFalse;
1664     if (type == 2)
1665       bmp_info.size=12;
1666     else
1667       if ((type == 3) || ((image->alpha_trait != BlendPixelTrait) &&
1668           (have_color_info == MagickFalse)))
1669         {
1670           type=3;
1671           bmp_info.size=40;
1672         }
1673       else
1674         {
1675           int
1676             extra_size;
1677
1678           bmp_info.size=108;
1679           extra_size=68;
1680           if ((image->rendering_intent != UndefinedIntent) ||
1681               (profile != (StringInfo *) NULL))
1682             {
1683               bmp_info.size=124;
1684               extra_size+=16;
1685             }
1686           bmp_info.file_size+=extra_size;
1687           bmp_info.offset_bits+=extra_size;
1688         }
1689     bmp_info.width=(ssize_t) image->columns;
1690     bmp_info.height=(ssize_t) image->rows;
1691     bmp_info.planes=1;
1692     bmp_info.image_size=(unsigned int) (bytes_per_line*image->rows);
1693     bmp_info.file_size+=bmp_info.image_size;
1694     bmp_info.x_pixels=75*39;
1695     bmp_info.y_pixels=75*39;
1696     switch (image->units)
1697     {
1698       case UndefinedResolution:
1699       case PixelsPerInchResolution:
1700       {
1701         bmp_info.x_pixels=(unsigned int) (100.0*image->resolution.x/2.54);
1702         bmp_info.y_pixels=(unsigned int) (100.0*image->resolution.y/2.54);
1703         break;
1704       }
1705       case PixelsPerCentimeterResolution:
1706       {
1707         bmp_info.x_pixels=(unsigned int) (100.0*image->resolution.x);
1708         bmp_info.y_pixels=(unsigned int) (100.0*image->resolution.y);
1709         break;
1710       }
1711     }
1712     bmp_info.colors_important=bmp_info.number_colors;
1713     /*
1714       Convert MIFF to BMP raster pixels.
1715     */
1716     pixel_info=AcquireVirtualMemory((size_t) bmp_info.image_size,
1717       sizeof(*pixels));
1718     if (pixel_info == (MemoryInfo *) NULL)
1719       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1720     pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
1721     (void) ResetMagickMemory(pixels,0,(size_t) bmp_info.image_size);
1722     switch (bmp_info.bits_per_pixel)
1723     {
1724       case 1:
1725       {
1726         size_t
1727           bit,
1728           byte;
1729
1730         /*
1731           Convert PseudoClass image to a BMP monochrome image.
1732         */
1733         for (y=0; y < (ssize_t) image->rows; y++)
1734         {
1735           ssize_t
1736             offset;
1737
1738           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1739           if (p == (const Quantum *) NULL)
1740             break;
1741           q=pixels+(image->rows-y-1)*bytes_per_line;
1742           bit=0;
1743           byte=0;
1744           for (x=0; x < (ssize_t) image->columns; x++)
1745           {
1746             byte<<=1;
1747             byte|=GetPixelIndex(image,p) != 0 ? 0x01 : 0x00;
1748             bit++;
1749             if (bit == 8)
1750               {
1751                 *q++=(unsigned char) byte;
1752                 bit=0;
1753                 byte=0;
1754               }
1755              p+=GetPixelChannels(image);
1756            }
1757            if (bit != 0)
1758              {
1759                *q++=(unsigned char) (byte << (8-bit));
1760                x++;
1761              }
1762           offset=(ssize_t) (image->columns+7)/8;
1763           for (x=offset; x < (ssize_t) bytes_per_line; x++)
1764             *q++=0x00;
1765           if (image->previous == (Image *) NULL)
1766             {
1767               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1768                 image->rows);
1769               if (status == MagickFalse)
1770                 break;
1771             }
1772         }
1773         break;
1774       }
1775       case 4:
1776       {
1777         size_t
1778           byte,
1779           nibble;
1780
1781         ssize_t
1782           offset;
1783
1784         /*
1785           Convert PseudoClass image to a BMP monochrome image.
1786         */
1787         for (y=0; y < (ssize_t) image->rows; y++)
1788         {
1789           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1790           if (p == (const Quantum *) NULL)
1791             break;
1792           q=pixels+(image->rows-y-1)*bytes_per_line;
1793           nibble=0;
1794           byte=0;
1795           for (x=0; x < (ssize_t) image->columns; x++)
1796           {
1797             byte<<=4;
1798             byte|=((size_t) GetPixelIndex(image,p) & 0x0f);
1799             nibble++;
1800             if (nibble == 2)
1801               {
1802                 *q++=(unsigned char) byte;
1803                 nibble=0;
1804                 byte=0;
1805               }
1806             p+=GetPixelChannels(image);
1807           }
1808           if (nibble != 0)
1809             {
1810               *q++=(unsigned char) (byte << 4);
1811               x++;
1812             }
1813           offset=(ssize_t) (image->columns+1)/2;
1814           for (x=offset; x < (ssize_t) bytes_per_line; x++)
1815             *q++=0x00;
1816           if (image->previous == (Image *) NULL)
1817             {
1818               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1819                 image->rows);
1820               if (status == MagickFalse)
1821                 break;
1822             }
1823         }
1824         break;
1825       }
1826       case 8:
1827       {
1828         /*
1829           Convert PseudoClass packet to BMP pixel.
1830         */
1831         for (y=0; y < (ssize_t) image->rows; y++)
1832         {
1833           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1834           if (p == (const Quantum *) NULL)
1835             break;
1836           q=pixels+(image->rows-y-1)*bytes_per_line;
1837           for (x=0; x < (ssize_t) image->columns; x++)
1838           {
1839             *q++=(unsigned char) GetPixelIndex(image,p);
1840             p+=GetPixelChannels(image);
1841           }
1842           for ( ; x < (ssize_t) bytes_per_line; x++)
1843             *q++=0x00;
1844           if (image->previous == (Image *) NULL)
1845             {
1846               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1847                 image->rows);
1848               if (status == MagickFalse)
1849                 break;
1850             }
1851         }
1852         break;
1853       }
1854       case 24:
1855       {
1856         /*
1857           Convert DirectClass packet to BMP BGR888.
1858         */
1859         for (y=0; y < (ssize_t) image->rows; y++)
1860         {
1861           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1862           if (p == (const Quantum *) NULL)
1863             break;
1864           q=pixels+(image->rows-y-1)*bytes_per_line;
1865           for (x=0; x < (ssize_t) image->columns; x++)
1866           {
1867             *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1868             *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1869             *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1870             p+=GetPixelChannels(image);
1871           }
1872           for (x=3L*(ssize_t) image->columns; x < (ssize_t) bytes_per_line; x++)
1873             *q++=0x00;
1874           if (image->previous == (Image *) NULL)
1875             {
1876               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1877                 image->rows);
1878               if (status == MagickFalse)
1879                 break;
1880             }
1881         }
1882         break;
1883       }
1884       case 32:
1885       {
1886         /*
1887           Convert DirectClass packet to ARGB8888 pixel.
1888         */
1889         for (y=0; y < (ssize_t) image->rows; y++)
1890         {
1891           p=GetVirtualPixels(image,0,y,image->columns,1,exception);
1892           if (p == (const Quantum *) NULL)
1893             break;
1894           q=pixels+(image->rows-y-1)*bytes_per_line;
1895           for (x=0; x < (ssize_t) image->columns; x++)
1896           {
1897             *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
1898             *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
1899             *q++=ScaleQuantumToChar(GetPixelRed(image,p));
1900             *q++=ScaleQuantumToChar(GetPixelAlpha(image,p));
1901             p+=GetPixelChannels(image);
1902           }
1903           if (image->previous == (Image *) NULL)
1904             {
1905               status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
1906                 image->rows);
1907               if (status == MagickFalse)
1908                 break;
1909             }
1910         }
1911         break;
1912       }
1913     }
1914     if ((type > 2) && (bmp_info.bits_per_pixel == 8))
1915       if (image_info->compression != NoCompression)
1916         {
1917           MemoryInfo
1918             *rle_info;
1919
1920           /*
1921             Convert run-length encoded raster pixels.
1922           */
1923           rle_info=AcquireVirtualMemory((size_t) (2*(bytes_per_line+2)+2),
1924             (image->rows+2)*sizeof(*pixels));
1925           if (rle_info == (MemoryInfo *) NULL)
1926             {
1927               pixel_info=RelinquishVirtualMemory(pixel_info);
1928               ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
1929             }
1930           bmp_data=(unsigned char *) GetVirtualMemoryBlob(rle_info);
1931           bmp_info.file_size-=bmp_info.image_size;
1932           bmp_info.image_size=(unsigned int) EncodeImage(image,bytes_per_line,
1933             pixels,bmp_data);
1934           bmp_info.file_size+=bmp_info.image_size;
1935           pixel_info=RelinquishVirtualMemory(pixel_info);
1936           pixel_info=rle_info;
1937           pixels=bmp_data;
1938           bmp_info.compression=BI_RLE8;
1939         }
1940     /*
1941       Write BMP for Windows, all versions, 14-byte header.
1942     */
1943     if (image->debug != MagickFalse)
1944       {
1945         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1946           "   Writing BMP version %.20g datastream",(double) type);
1947         if (image->storage_class == DirectClass)
1948           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1949             "   Storage class=DirectClass");
1950         else
1951           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1952             "   Storage class=PseudoClass");
1953         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1954           "   Image depth=%.20g",(double) image->depth);
1955         if (image->alpha_trait == BlendPixelTrait)
1956           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1957             "   Matte=True");
1958         else
1959           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1960             "   Matte=MagickFalse");
1961         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1962           "   BMP bits_per_pixel=%.20g",(double) bmp_info.bits_per_pixel);
1963         switch ((int) bmp_info.compression)
1964         {
1965            case BI_RGB:
1966            {
1967              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1968                "   Compression=BI_RGB");
1969              break;
1970            }
1971            case BI_RLE8:
1972            {
1973              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1974                "   Compression=BI_RLE8");
1975              break;
1976            }
1977            case BI_BITFIELDS:
1978            {
1979              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1980                "   Compression=BI_BITFIELDS");
1981              break;
1982            }
1983            default:
1984            {
1985              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1986                "   Compression=UNKNOWN (%u)",bmp_info.compression);
1987              break;
1988            }
1989         }
1990         if (bmp_info.number_colors == 0)
1991           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1992             "   Number_colors=unspecified");
1993         else
1994           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1995             "   Number_colors=%u",bmp_info.number_colors);
1996       }
1997     (void) WriteBlob(image,2,(unsigned char *) "BM");
1998     (void) WriteBlobLSBLong(image,bmp_info.file_size);
1999     (void) WriteBlobLSBLong(image,bmp_info.ba_offset);  /* always 0 */
2000     (void) WriteBlobLSBLong(image,bmp_info.offset_bits);
2001     if (type == 2)
2002       {
2003         /*
2004           Write 12-byte version 2 bitmap header.
2005         */
2006         (void) WriteBlobLSBLong(image,bmp_info.size);
2007         (void) WriteBlobLSBShort(image,(unsigned short) bmp_info.width);
2008         (void) WriteBlobLSBShort(image,(unsigned short) bmp_info.height);
2009         (void) WriteBlobLSBShort(image,bmp_info.planes);
2010         (void) WriteBlobLSBShort(image,bmp_info.bits_per_pixel);
2011       }
2012     else
2013       {
2014         /*
2015           Write 40-byte version 3+ bitmap header.
2016         */
2017         (void) WriteBlobLSBLong(image,bmp_info.size);
2018         (void) WriteBlobLSBLong(image,(unsigned int) bmp_info.width);
2019         (void) WriteBlobLSBLong(image,(unsigned int) bmp_info.height);
2020         (void) WriteBlobLSBShort(image,bmp_info.planes);
2021         (void) WriteBlobLSBShort(image,bmp_info.bits_per_pixel);
2022         (void) WriteBlobLSBLong(image,bmp_info.compression);
2023         (void) WriteBlobLSBLong(image,bmp_info.image_size);
2024         (void) WriteBlobLSBLong(image,bmp_info.x_pixels);
2025         (void) WriteBlobLSBLong(image,bmp_info.y_pixels);
2026         (void) WriteBlobLSBLong(image,bmp_info.number_colors);
2027         (void) WriteBlobLSBLong(image,bmp_info.colors_important);
2028       }
2029     if ((type > 3) && ((image->alpha_trait == BlendPixelTrait) ||
2030         (have_color_info != MagickFalse)))
2031       {
2032         /*
2033           Write the rest of the 108-byte BMP Version 4 header.
2034         */
2035         (void) WriteBlobLSBLong(image,0x00ff0000U);  /* Red mask */
2036         (void) WriteBlobLSBLong(image,0x0000ff00U);  /* Green mask */
2037         (void) WriteBlobLSBLong(image,0x000000ffU);  /* Blue mask */
2038         (void) WriteBlobLSBLong(image,0xff000000U);  /* Alpha mask */
2039         (void) WriteBlobLSBLong(image,0x73524742U);  /* sRGB */
2040         (void) WriteBlobLSBLong(image,(unsigned int)
2041           (image->chromaticity.red_primary.x*0x40000000));
2042         (void) WriteBlobLSBLong(image,(unsigned int)
2043           (image->chromaticity.red_primary.y*0x40000000));
2044         (void) WriteBlobLSBLong(image,(unsigned int)
2045           ((1.000f-(image->chromaticity.red_primary.x+
2046           image->chromaticity.red_primary.y))*0x40000000));
2047         (void) WriteBlobLSBLong(image,(unsigned int)
2048           (image->chromaticity.green_primary.x*0x40000000));
2049         (void) WriteBlobLSBLong(image,(unsigned int)
2050           (image->chromaticity.green_primary.y*0x40000000));
2051         (void) WriteBlobLSBLong(image,(unsigned int)
2052           ((1.000f-(image->chromaticity.green_primary.x+
2053           image->chromaticity.green_primary.y))*0x40000000));
2054         (void) WriteBlobLSBLong(image,(unsigned int)
2055           (image->chromaticity.blue_primary.x*0x40000000));
2056         (void) WriteBlobLSBLong(image,(unsigned int)
2057           (image->chromaticity.blue_primary.y*0x40000000));
2058         (void) WriteBlobLSBLong(image,(unsigned int)
2059           ((1.000f-(image->chromaticity.blue_primary.x+
2060           image->chromaticity.blue_primary.y))*0x40000000));
2061         (void) WriteBlobLSBLong(image,(unsigned int)
2062           (bmp_info.gamma_scale.x*0x10000));
2063         (void) WriteBlobLSBLong(image,(unsigned int)
2064           (bmp_info.gamma_scale.y*0x10000));
2065         (void) WriteBlobLSBLong(image,(unsigned int)
2066           (bmp_info.gamma_scale.z*0x10000));
2067         if ((image->rendering_intent != UndefinedIntent) ||
2068             (profile != (StringInfo *) NULL))
2069           {
2070             ssize_t
2071               intent;
2072
2073             switch ((int) image->rendering_intent)
2074             {
2075               case SaturationIntent:
2076               {
2077                 intent=LCS_GM_BUSINESS;
2078                 break;
2079               }
2080               case RelativeIntent:
2081               {
2082                 intent=LCS_GM_GRAPHICS;
2083                 break;
2084               }
2085               case PerceptualIntent:
2086               {
2087                 intent=LCS_GM_IMAGES;
2088                 break;
2089               }
2090               case AbsoluteIntent:
2091               {
2092                 intent=LCS_GM_ABS_COLORIMETRIC;
2093                 break;
2094               }
2095               default:
2096               {
2097                 intent=0;
2098                 break;
2099               }
2100             }
2101             (void) WriteBlobLSBLong(image,(unsigned int) intent);
2102             (void) WriteBlobLSBLong(image,0x00);  /* dummy profile data */
2103             (void) WriteBlobLSBLong(image,0x00);  /* dummy profile length */
2104             (void) WriteBlobLSBLong(image,0x00);  /* reserved */
2105           }
2106       }
2107     if (image->storage_class == PseudoClass)
2108       {
2109         unsigned char
2110           *bmp_colormap;
2111
2112         /*
2113           Dump colormap to file.
2114         */
2115         if (image->debug != MagickFalse)
2116           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2117             "  Colormap: %.20g entries",(double) image->colors);
2118         bmp_colormap=(unsigned char *) AcquireQuantumMemory((size_t) (1UL <<
2119           bmp_info.bits_per_pixel),4*sizeof(*bmp_colormap));
2120         if (bmp_colormap == (unsigned char *) NULL)
2121           ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
2122         q=bmp_colormap;
2123         for (i=0; i < (ssize_t) MagickMin((ssize_t) image->colors,(ssize_t) bmp_info.number_colors); i++)
2124         {
2125           *q++=ScaleQuantumToChar(ClampToQuantum(image->colormap[i].blue));
2126           *q++=ScaleQuantumToChar(ClampToQuantum(image->colormap[i].green));
2127           *q++=ScaleQuantumToChar(ClampToQuantum(image->colormap[i].red));
2128           if (type > 2)
2129             *q++=(unsigned char) 0x0;
2130         }
2131         for ( ; i < (ssize_t) (1UL << bmp_info.bits_per_pixel); i++)
2132         {
2133           *q++=(unsigned char) 0x00;
2134           *q++=(unsigned char) 0x00;
2135           *q++=(unsigned char) 0x00;
2136           if (type > 2)
2137             *q++=(unsigned char) 0x00;
2138         }
2139         if (type <= 2)
2140           (void) WriteBlob(image,(size_t) (3*(1L << bmp_info.bits_per_pixel)),
2141             bmp_colormap);
2142         else
2143           (void) WriteBlob(image,(size_t) (4*(1L << bmp_info.bits_per_pixel)),
2144             bmp_colormap);
2145         bmp_colormap=(unsigned char *) RelinquishMagickMemory(bmp_colormap);
2146       }
2147     if (image->debug != MagickFalse)
2148       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2149         "  Pixels:  %u bytes",bmp_info.image_size);
2150     (void) WriteBlob(image,(size_t) bmp_info.image_size,pixels);
2151     pixel_info=RelinquishVirtualMemory(pixel_info);
2152     if (GetNextImageInList(image) == (Image *) NULL)
2153       break;
2154     image=SyncNextImageInList(image);
2155     status=SetImageProgress(image,SaveImagesTag,scene++,
2156       GetImageListLength(image));
2157     if (status == MagickFalse)
2158       break;
2159   } while (image_info->adjoin != MagickFalse);
2160   (void) CloseBlob(image);
2161   return(MagickTrue);
2162 }