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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                        PPPP    AAA   L      M   M                           %
   7 %                        P   P  A   A  L      MM MM                           %
   8 %                        PPPP   AAAAA  L      M M M                           %
   9 %                        P      A   A  L      M   M                           %
  10 %                        P      A   A  LLLLL  M   M                           %
  11 %                                                                             %
  12 %                                                                             %
  13 %                          Read/Write Palm Pixmap.                            %
  14 %                                                                             %
  15 %                                                                             %
  16 %                              Software Design                                %
  17 %                            Christopher R. Hawks                             %
  18 %                               December 2001                                 %
  19 %                                                                             %
  20 %  Copyright 1999-2004 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %                                                                             %
  35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  36 %
  37 %  Based on pnmtopalm by Bill Janssen and ppmtobmp by Ian Goldberg.
  38 %
  39 */
  40 \f
  41 /*
  42   Include declarations.
  43 */
  44 #include "MagickCore/studio.h"
  45 #include "MagickCore/attribute.h"
  46 #include "MagickCore/blob.h"
  47 #include "MagickCore/blob-private.h"
  48 #include "MagickCore/cache.h"
  49 #include "MagickCore/color.h"
  50 #include "MagickCore/colormap.h"
  51 #include "MagickCore/colormap-private.h"
  52 #include "MagickCore/color-private.h"
  53 #include "MagickCore/colorspace.h"
  54 #include "MagickCore/colorspace-private.h"
  55 #include "MagickCore/constitute.h"
  56 #include "MagickCore/exception.h"
  57 #include "MagickCore/histogram.h"
  58 #include "MagickCore/image.h"
  59 #include "MagickCore/image-private.h"
  60 #include "MagickCore/list.h"
  61 #include "MagickCore/magick.h"
  62 #include "MagickCore/memory_.h"
  63 #include "MagickCore/monitor.h"
  64 #include "MagickCore/monitor-private.h"
  65 #include "MagickCore/paint.h"
  66 #include "MagickCore/pixel-accessor.h"
  67 #include "MagickCore/property.h"
  68 #include "MagickCore/quantize.h"
  69 #include "MagickCore/quantum-private.h"
  70 #include "MagickCore/static.h"
  71 #include "MagickCore/string_.h"
  72 #include "MagickCore/module.h"
  73 #include "MagickCore/utility.h"
  74 \f
  75 /*
  76   Define declarations.
  77 */
  78 #define PALM_IS_COMPRESSED_FLAG  0x8000
  79 #define PALM_HAS_COLORMAP_FLAG  0x4000
  80 #define PALM_HAS_FOUR_BYTE_FIELD  0x0200
  81 #define PALM_HAS_TRANSPARENCY_FLAG  0x2000
  82 #define PALM_IS_INDIRECT  0x1000
  83 #define PALM_IS_FOR_SCREEN  0x0800
  84 #define PALM_IS_DIRECT_COLOR  0x0400
  85 #define PALM_COMPRESSION_SCANLINE  0x00
  86 #define PALM_COMPRESSION_RLE  0x01
  87 #define PALM_COMPRESSION_NONE  0xFF
  88 \f
  89 /*
  90  The 256 color system palette for Palm Computing Devices.
  91 */
  92 static unsigned char
  93   PalmPalette[256][3] =
  94   {
  95     {255, 255,255}, {255, 204,255}, {255, 153,255}, {255, 102,255},
  96     {255,  51,255}, {255,   0,255}, {255, 255,204}, {255, 204,204},
  97     {255, 153,204}, {255, 102,204}, {255,  51,204}, {255,   0,204},
  98     {255, 255,153}, {255, 204,153}, {255, 153,153}, {255, 102,153},
  99     {255,  51,153}, {255,   0,153}, {204, 255,255}, {204, 204,255},
 100     {204, 153,255}, {204, 102,255}, {204,  51,255}, {204,   0,255},
 101     {204, 255,204}, {204, 204,204}, {204, 153,204}, {204, 102,204},
 102     {204,  51,204}, {204,   0,204}, {204, 255,153}, {204, 204,153},
 103     {204, 153,153}, {204, 102,153}, {204,  51,153}, {204,   0,153},
 104     {153, 255,255}, {153, 204,255}, {153, 153,255}, {153, 102,255},
 105     {153,  51,255}, {153,   0,255}, {153, 255,204}, {153, 204,204},
 106     {153, 153,204}, {153, 102,204}, {153,  51,204}, {153,   0,204},
 107     {153, 255,153}, {153, 204,153}, {153, 153,153}, {153, 102,153},
 108     {153,  51,153}, {153,   0,153}, {102, 255,255}, {102, 204,255},
 109     {102, 153,255}, {102, 102,255}, {102,  51,255}, {102,   0,255},
 110     {102, 255,204}, {102, 204,204}, {102, 153,204}, {102, 102,204},
 111     {102,  51,204}, {102,   0,204}, {102, 255,153}, {102, 204,153},
 112     {102, 153,153}, {102, 102,153}, {102,  51,153}, {102,   0,153},
 113     { 51, 255,255}, { 51, 204,255}, { 51, 153,255}, { 51, 102,255},
 114     { 51,  51,255}, { 51,   0,255}, { 51, 255,204}, { 51, 204,204},
 115     { 51, 153,204}, { 51, 102,204}, { 51,  51,204}, { 51,   0,204},
 116     { 51, 255,153}, { 51, 204,153}, { 51, 153,153}, { 51, 102,153},
 117     { 51,  51,153}, { 51,   0,153}, {  0, 255,255}, {  0, 204,255},
 118     {  0, 153,255}, {  0, 102,255}, {  0,  51,255}, {  0,   0,255},
 119     {  0, 255,204}, {  0, 204,204}, {  0, 153,204}, {  0, 102,204},
 120     {  0,  51,204}, {  0,   0,204}, {  0, 255,153}, {  0, 204,153},
 121     {  0, 153,153}, {  0, 102,153}, {  0,  51,153}, {  0,   0,153},
 122     {255, 255,102}, {255, 204,102}, {255, 153,102}, {255, 102,102},
 123     {255,  51,102}, {255,   0,102}, {255, 255, 51}, {255, 204, 51},
 124     {255, 153, 51}, {255, 102, 51}, {255,  51, 51}, {255,   0, 51},
 125     {255, 255,  0}, {255, 204,  0}, {255, 153,  0}, {255, 102,  0},
 126     {255,  51,  0}, {255,   0,  0}, {204, 255,102}, {204, 204,102},
 127     {204, 153,102}, {204, 102,102}, {204,  51,102}, {204,   0,102},
 128     {204, 255, 51}, {204, 204, 51}, {204, 153, 51}, {204, 102, 51},
 129     {204,  51, 51}, {204,   0, 51}, {204, 255,  0}, {204, 204,  0},
 130     {204, 153,  0}, {204, 102,  0}, {204,  51,  0}, {204,   0,  0},
 131     {153, 255,102}, {153, 204,102}, {153, 153,102}, {153, 102,102},
 132     {153,  51,102}, {153,   0,102}, {153, 255, 51}, {153, 204, 51},
 133     {153, 153, 51}, {153, 102, 51}, {153,  51, 51}, {153,   0, 51},
 134     {153, 255,  0}, {153, 204,  0}, {153, 153,  0}, {153, 102,  0},
 135     {153,  51,  0}, {153,   0,  0}, {102, 255,102}, {102, 204,102},
 136     {102, 153,102}, {102, 102,102}, {102,  51,102}, {102,   0,102},
 137     {102, 255, 51}, {102, 204, 51}, {102, 153, 51}, {102, 102, 51},
 138     {102,  51, 51}, {102,   0, 51}, {102, 255,  0}, {102, 204,  0},
 139     {102, 153,  0}, {102, 102,  0}, {102,  51,  0}, {102,   0,  0},
 140     { 51, 255,102}, { 51, 204,102}, { 51, 153,102}, { 51, 102,102},
 141     { 51,  51,102}, { 51,   0,102}, { 51, 255, 51}, { 51, 204, 51},
 142     { 51, 153, 51}, { 51, 102, 51}, { 51,  51, 51}, { 51,   0, 51},
 143     { 51, 255,  0}, { 51, 204,  0}, { 51, 153,  0}, { 51, 102,  0},
 144     { 51,  51,  0}, { 51,   0,  0}, {  0, 255,102}, {  0, 204,102},
 145     {  0, 153,102}, {  0, 102,102}, {  0,  51,102}, {  0,   0,102},
 146     {  0, 255, 51}, {  0, 204, 51}, {  0, 153, 51}, {  0, 102, 51},
 147     {  0,  51, 51}, {  0,   0, 51}, {  0, 255,  0}, {  0, 204,  0},
 148     {  0, 153,  0}, {  0, 102,  0}, {  0,  51,  0}, { 17,  17, 17},
 149     { 34,  34, 34}, { 68,  68, 68}, { 85,  85, 85}, {119, 119,119},
 150     {136, 136,136}, {170, 170,170}, {187, 187,187}, {221, 221,221},
 151     {238, 238,238}, {192, 192,192}, {128,   0,  0}, {128,   0,128},
 152     {  0, 128,  0}, {  0, 128,128}, {  0,   0,  0}, {  0,   0,  0},
 153     {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0},
 154     {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0},
 155     {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0},
 156     {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0},
 157     {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0},
 158     {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0}, {  0,   0,  0}
 159   };
 160 \f
 161 /*
 162   Forward declarations.
 163 */
 164 static MagickBooleanType
 165   WritePALMImage(const ImageInfo *,Image *,ExceptionInfo *);
 166 \f
 167 /*
 168 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 169 %                                                                             %
 170 %                                                                             %
 171 %                                                                             %
 172 %   F i n d C o l o r                                                         %
 173 %                                                                             %
 174 %                                                                             %
 175 %                                                                             %
 176 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 177 %
 178 %  FindColor() returns the index of the matching entry from PalmPalette for a
 179 %  given PixelInfo.
 180 %
 181 %  The format of the FindColor method is:
 182 %
 183 %      int FindColor(PixelInfo *pixel)
 184 %
 185 %  A description of each parameter follows:
 186 %
 187 %    o int: the index of the matching color or -1 if not found/
 188 %
 189 %    o pixel: a pointer to the PixelInfo to be matched.
 190 %
 191 */
 192 static ssize_t FindColor(PixelInfo *packet)
 193 {
 194   register ssize_t
 195     i;
 196
 197   for (i=0; i < 256; i++)
 198     if (ScaleQuantumToChar(ClampToQuantum(packet->red)) == PalmPalette[i][0] &&
 199         ScaleQuantumToChar(ClampToQuantum(packet->green)) == PalmPalette[i][1] &&
 200         ScaleQuantumToChar(ClampToQuantum(packet->blue)) == PalmPalette[i][2])
 201       return(i);
 202   return(-1);
 203 }
 204 \f
 205 /*
 206 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 207 %                                                                             %
 208 %                                                                             %
 209 %                                                                             %
 210 %   R e a d P A L M I m a g e                                                 %
 211 %                                                                             %
 212 %                                                                             %
 213 %                                                                             %
 214 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 215 %
 216 %  ReadPALMImage() reads an image of raw bites in LSB order and returns it.  It
 217 %  allocates the memory necessary for the new Image structure and returns a
 218 %  pointer to the new image.
 219 %
 220 %  The format of the ReadPALMImage method is:
 221 %
 222 %      Image *ReadPALMImage(const ImageInfo *image_info,
 223 %        ExceptionInfo *exception)
 224 %
 225 %  A description of each parameter follows:
 226 %
 227 %    o image_info: Specifies a pointer to an ImageInfo structure.
 228 %
 229 %    o exception: return any errors or warnings in this structure.
 230 %
 231 */
 232
 233 static inline size_t MagickMax(const size_t x,const size_t y)
 234 {
 235   if (x > y)
 236     return(x);
 237   return(y);
 238 }
 239
 240 static inline ssize_t MagickMin(const ssize_t x,const ssize_t y)
 241 {
 242   if (x < y)
 243     return(x);
 244   return(y);
 245 }
 246
 247 static Image *ReadPALMImage(const ImageInfo *image_info,
 248   ExceptionInfo *exception)
 249 {
 250   Image
 251     *image;
 252
 253   MagickBooleanType
 254     status;
 255
 256   MagickOffsetType
 257     totalOffset,
 258     seekNextDepth;
 259
 260   PixelInfo
 261     transpix;
 262
 263   Quantum
 264     index;
 265
 266   register ssize_t
 267     i,
 268     x;
 269
 270   register Quantum
 271     *q;
 272
 273   ssize_t
 274     count,
 275     y;
 276
 277   size_t
 278     bytes_per_row,
 279     flags,
 280     bits_per_pixel,
 281     version,
 282     nextDepthOffset,
 283     transparentIndex,
 284     compressionType,
 285     byte,
 286     mask,
 287     redbits,
 288     greenbits,
 289     bluebits,
 290     one,
 291     pad,
 292     size,
 293     bit;
 294
 295   unsigned char
 296     *lastrow,
 297     *one_row,
 298     *ptr;
 299
 300   unsigned short
 301     color16;
 302
 303   /*
 304     Open image file.
 305   */
 306   assert(image_info != (const ImageInfo *) NULL);
 307   assert(image_info->signature == MagickSignature);
 308   if (image_info->debug != MagickFalse)
 309     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 310       image_info->filename);
 311   assert(exception != (ExceptionInfo *) NULL);
 312   assert(exception->signature == MagickSignature);
 313   image=AcquireImage(image_info,exception);
 314   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 315   if (status == MagickFalse)
 316     {
 317       (void) DestroyImageList(image);
 318       return((Image *) NULL);
 319     }
 320   totalOffset=0;
 321   do
 322   {
 323     image->columns=ReadBlobMSBShort(image);
 324     image->rows=ReadBlobMSBShort(image);
 325     if (EOFBlob(image) != MagickFalse)
 326       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 327     if ((image->columns == 0) || (image->rows == 0))
 328       ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
 329     bytes_per_row=ReadBlobMSBShort(image);
 330     flags=ReadBlobMSBShort(image);
 331     bits_per_pixel=(size_t) ReadBlobByte(image);
 332     if ((bits_per_pixel == 0) || (bits_per_pixel > 16))
 333       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 334     version=(size_t) ReadBlobByte(image);
 335     (void) version;
 336     nextDepthOffset=(size_t) ReadBlobMSBShort(image);
 337     transparentIndex=(size_t) ReadBlobByte(image);
 338     compressionType=(size_t) ReadBlobByte(image);
 339     pad=ReadBlobMSBShort(image);
 340     (void) pad;
 341     /*
 342       Initialize image colormap.
 343     */
 344     one=1;
 345     if ((bits_per_pixel < 16) &&
 346         (AcquireImageColormap(image,one << bits_per_pixel,exception) == MagickFalse))
 347       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 348     GetPixelInfo(image,&transpix);
 349     if (bits_per_pixel == 16)  /* Direct Color */
 350       {
 351         redbits=(size_t) ReadBlobByte(image);  /* # of bits of red */
 352         (void) redbits;
 353         greenbits=(size_t) ReadBlobByte(image);  /* # of bits of green */
 354         (void) greenbits;
 355         bluebits=(size_t) ReadBlobByte(image);  /* # of bits of blue */
 356         (void) bluebits;
 357         ReadBlobByte(image);  /* reserved by Palm */
 358         ReadBlobByte(image);  /* reserved by Palm */
 359         transpix.red=(double) (QuantumRange*ReadBlobByte(image)/31);
 360         transpix.green=(double) (QuantumRange*ReadBlobByte(image)/63);
 361         transpix.blue=(double) (QuantumRange*ReadBlobByte(image)/31);
 362       }
 363     if (bits_per_pixel == 8)
 364       {
 365         ssize_t
 366           index;
 367
 368         if (flags & PALM_HAS_COLORMAP_FLAG)
 369           {
 370             count=(ssize_t) ReadBlobMSBShort(image);
 371             for (i=0; i < (ssize_t) count; i++)
 372             {
 373               ReadBlobByte(image);
 374               index=ConstrainColormapIndex(image,255-i,exception);
 375               image->colormap[index].red=(MagickRealType)
 376                 ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
 377               image->colormap[index].green=(MagickRealType)
 378                 ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
 379               image->colormap[index].blue=(MagickRealType)
 380                 ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
 381           }
 382         }
 383       else
 384         {
 385           for (i=0; i < (ssize_t) (1L << bits_per_pixel); i++)
 386           {
 387             index=ConstrainColormapIndex(image,255-i,exception);
 388             image->colormap[index].red=(MagickRealType)
 389               ScaleCharToQuantum(PalmPalette[i][0]);
 390             image->colormap[index].green=(MagickRealType)
 391               ScaleCharToQuantum(PalmPalette[i][1]);
 392             image->colormap[index].blue=(MagickRealType)
 393               ScaleCharToQuantum(PalmPalette[i][2]);
 394           }
 395         }
 396       }
 397     if (flags & PALM_IS_COMPRESSED_FLAG)
 398       size=ReadBlobMSBShort(image);
 399     (void) size;
 400     image->storage_class=DirectClass;
 401     if (bits_per_pixel < 16)
 402       {
 403         image->storage_class=PseudoClass;
 404         image->depth=8;
 405       }
 406     one_row=(unsigned char *) AcquireQuantumMemory(MagickMax(bytes_per_row,
 407       2*image->columns),sizeof(*one_row));
 408     if (one_row == (unsigned char *) NULL)
 409       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 410     lastrow=(unsigned char *) NULL;
 411     if (compressionType == PALM_COMPRESSION_SCANLINE) {
 412       lastrow=(unsigned char *) AcquireQuantumMemory(MagickMax(bytes_per_row,
 413         2*image->columns),sizeof(*lastrow));
 414     if (lastrow == (unsigned char *) NULL)
 415       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 416     }
 417     mask=(size_t) (1U << bits_per_pixel)-1;
 418     for (y = 0; y < (ssize_t) image->rows; y++)
 419     {
 420       if ((flags & PALM_IS_COMPRESSED_FLAG) == 0)
 421         {
 422           /* TODO move out of loop! */
 423           image->compression=NoCompression;
 424           count=ReadBlob(image,bytes_per_row,one_row);
 425         }
 426       else
 427         {
 428           if (compressionType == PALM_COMPRESSION_RLE)
 429             {
 430               /* TODO move out of loop! */
 431               image->compression=RLECompression;
 432               for (i=0; i < (ssize_t) bytes_per_row; )
 433               {
 434                 count=(ssize_t) ReadBlobByte(image);
 435                 count=MagickMin(count,(ssize_t) bytes_per_row-i);
 436                 byte=(size_t) ReadBlobByte(image);
 437                 (void) ResetMagickMemory(one_row+i,(int) byte,(size_t) count);
 438                 i+=count;
 439               }
 440           }
 441         else
 442           if (compressionType == PALM_COMPRESSION_SCANLINE)
 443             {
 444               size_t
 445                 one;
 446
 447               /* TODO move out of loop! */
 448               one=1;
 449               image->compression=FaxCompression;
 450               for (i=0; i < (ssize_t) bytes_per_row; i+=8)
 451               {
 452                 count=(ssize_t) ReadBlobByte(image);
 453                 byte=(size_t) MagickMin((ssize_t) bytes_per_row-i,8);
 454                 for (bit=0; bit < byte; bit++)
 455                 {
 456                   if ((y == 0) || (count & (one << (7 - bit))))
 457                     one_row[i+bit]=(unsigned char) ReadBlobByte(image);
 458                   else
 459                     one_row[i+bit]=lastrow[i+bit];
 460                 }
 461               }
 462               (void) CopyMagickMemory(lastrow, one_row, bytes_per_row);
 463             }
 464         }
 465       ptr=one_row;
 466       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 467       if (q == (Quantum *) NULL)
 468         break;
 469       if (bits_per_pixel == 16)
 470         {
 471           if (image->columns > (2*bytes_per_row))
 472             ThrowReaderException(CorruptImageError,"CorruptImage");
 473           for (x=0; x < (ssize_t) image->columns; x++)
 474           {
 475             color16=(*ptr++ << 8);
 476             color16|=(*ptr++);
 477             SetPixelRed(image,(Quantum) ((QuantumRange*((color16 >> 11) &
 478               0x1f))/0x1f),q);
 479             SetPixelGreen(image,(Quantum) ((QuantumRange*((color16 >> 5) &
 480               0x3f))/0x3f),q);
 481             SetPixelBlue(image,(Quantum) ((QuantumRange*((color16 >> 0) &
 482               0x1f))/0x1f),q);
 483             SetPixelAlpha(image,OpaqueAlpha,q);
 484             q+=GetPixelChannels(image);
 485           }
 486         }
 487       else
 488         {
 489           bit=8-bits_per_pixel;
 490           for (x=0; x < (ssize_t) image->columns; x++)
 491           {
 492             if ((size_t) (ptr-one_row) >= bytes_per_row)
 493               ThrowReaderException(CorruptImageError,"CorruptImage");
 494             index=(Quantum) (mask-(((*ptr) & (mask << bit)) >> bit));
 495             SetPixelIndex(image,index,q);
 496             SetPixelInfoPixel(image,image->colormap+(ssize_t) index,q);
 497             if (bit)
 498               bit-=bits_per_pixel;
 499             else
 500               {
 501                 ptr++;
 502                 bit=8-bits_per_pixel;
 503               }
 504             q+=GetPixelChannels(image);
 505           }
 506           if (SyncAuthenticPixels(image,exception) == MagickFalse)
 507             break;
 508         }
 509         if (image->previous == (Image *) NULL)
 510           {
 511             status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 512               image->rows);
 513             if (status == MagickFalse)
 514               break;
 515           }
 516       }
 517     if (flags & PALM_HAS_TRANSPARENCY_FLAG)
 518       {
 519         if (bits_per_pixel != 16)
 520           transpix=image->colormap[mask-transparentIndex];
 521         (void) TransparentPaintImage(image,&transpix,(Quantum) TransparentAlpha,
 522           MagickFalse,exception);
 523       }
 524     one_row=(unsigned char *) RelinquishMagickMemory(one_row);
 525     if (compressionType == PALM_COMPRESSION_SCANLINE)
 526       lastrow=(unsigned char *) RelinquishMagickMemory(lastrow);
 527     /*
 528       Proceed to next image. Copied from coders/pnm.c
 529     */
 530     if (image_info->number_scenes != 0)
 531       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 532         break;
 533     if (nextDepthOffset != 0)
 534       {
 535         /*
 536           Skip to next image.
 537         */
 538         totalOffset+=(MagickOffsetType) (nextDepthOffset*4);
 539         if (totalOffset >= (MagickOffsetType) GetBlobSize(image))
 540           {
 541             ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 542           }
 543         else
 544           {
 545             seekNextDepth=SeekBlob(image,totalOffset,SEEK_SET);
 546           }
 547         if (seekNextDepth != totalOffset)
 548           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 549         /*
 550           Allocate next image structure. Copied from coders/pnm.c
 551         */
 552         AcquireNextImage(image_info,image,exception);
 553         if (GetNextImageInList(image) == (Image *) NULL)
 554           {
 555             (void) DestroyImageList(image);
 556             return((Image *) NULL);
 557           }
 558         image=SyncNextImageInList(image);
 559         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 560           GetBlobSize(image));
 561         if (status == MagickFalse)
 562           break;
 563       }
 564   } while (nextDepthOffset != 0);
 565   (void) CloseBlob(image);
 566   return(GetFirstImageInList(image));
 567 }
 568 \f
 569 /*
 570 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 571 %                                                                             %
 572 %                                                                             %
 573 %                                                                             %
 574 %   R e g i s t e r P A L M I m a g e                                         %
 575 %                                                                             %
 576 %                                                                             %
 577 %                                                                             %
 578 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 579 %
 580 %  RegisterPALMImage() adds properties for the PALM image format to the list of
 581 %  supported formats.  The properties include the image format tag, a method to
 582 %  read and/or write the format, whether the format supports the saving of more
 583 %  than one frame to the same file or blob, whether the format supports native
 584 %  in-memory I/O, and a brief description of the format.
 585 %
 586 %  The format of the RegisterPALMImage method is:
 587 %
 588 %      size_t RegisterPALMImage(void)
 589 %
 590 */
 591 ModuleExport size_t RegisterPALMImage(void)
 592 {
 593   MagickInfo
 594     *entry;
 595
 596   entry=SetMagickInfo("PALM");
 597   entry->decoder=(DecodeImageHandler *) ReadPALMImage;
 598   entry->encoder=(EncodeImageHandler *) WritePALMImage;
 599   entry->seekable_stream=MagickTrue;
 600   entry->description=ConstantString("Palm pixmap");
 601   entry->module=ConstantString("PALM");
 602   (void) RegisterMagickInfo(entry);
 603   return(MagickImageCoderSignature);
 604 }
 605 \f
 606 /*
 607 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 608 %                                                                             %
 609 %                                                                             %
 610 %                                                                             %
 611 %   U n r e g i s t e r P A L M I m a g e                                     %
 612 %                                                                             %
 613 %                                                                             %
 614 %                                                                             %
 615 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 616 %
 617 %  UnregisterPALMImage() removes format registrations made by the PALM
 618 %  module from the list of supported formats.
 619 %
 620 %  The format of the UnregisterPALMImage method is:
 621 %
 622 %      UnregisterPALMImage(void)
 623 %
 624 */
 625 ModuleExport void UnregisterPALMImage(void)
 626 {
 627   (void) UnregisterMagickInfo("PALM");
 628 }
 629 \f
 630 /*
 631 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 632 %                                                                             %
 633 %                                                                             %
 634 %                                                                             %
 635 %   W r i t e P A L M I m a g e                                               %
 636 %                                                                             %
 637 %                                                                             %
 638 %                                                                             %
 639 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 640 %
 641 %  WritePALMImage() writes an image of raw bits in LSB order to a file.
 642 %
 643 %  The format of the WritePALMImage method is:
 644 %
 645 %      MagickBooleanType WritePALMImage(const ImageInfo *image_info,
 646 %        Image *image,ExceptionInfo *exception)
 647 %
 648 %  A description of each parameter follows.
 649 %
 650 %    o image_info: Specifies a pointer to an ImageInfo structure.
 651 %
 652 %    o image:  A pointer to a Image structure.
 653 %
 654 %    o exception: return any errors or warnings in this structure.
 655 %
 656 */
 657 static MagickBooleanType WritePALMImage(const ImageInfo *image_info,
 658   Image *image,ExceptionInfo *exception)
 659 {
 660   MagickBooleanType
 661     status;
 662
 663   MagickOffsetType
 664     currentOffset,
 665     offset,
 666     scene;
 667
 668   MagickSizeType
 669     cc;
 670
 671   PixelInfo
 672     transpix;
 673
 674   QuantizeInfo
 675     *quantize_info;
 676
 677   register ssize_t
 678     x;
 679
 680   register const Quantum
 681     *p;
 682
 683   register Quantum
 684     *q;
 685
 686   ssize_t
 687     y;
 688
 689   size_t
 690     count,
 691     bits_per_pixel,
 692     bytes_per_row,
 693     nextDepthOffset,
 694     one;
 695
 696   unsigned char
 697     bit,
 698     byte,
 699     color,
 700     *lastrow,
 701     *one_row,
 702     *ptr,
 703     version;
 704
 705   unsigned int
 706     transparentIndex;
 707
 708   unsigned short
 709     color16,
 710     flags;
 711
 712   /*
 713     Open output image file.
 714   */
 715   assert(image_info != (const ImageInfo *) NULL);
 716   assert(image_info->signature == MagickSignature);
 717   assert(image != (Image *) NULL);
 718   assert(image->signature == MagickSignature);
 719   if (image->debug != MagickFalse)
 720     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 721   assert(exception != (ExceptionInfo *) NULL);
 722   assert(exception->signature == MagickSignature);
 723   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 724   if (status == MagickFalse)
 725     return(status);
 726   quantize_info=AcquireQuantizeInfo(image_info);
 727   flags=0;
 728   currentOffset=0;
 729   transparentIndex=0;
 730   transpix.red=0.0;
 731   transpix.green=0.0;
 732   transpix.blue=0.0;
 733   transpix.alpha=0.0;
 734   one=1;
 735   version=0;
 736   scene=0;
 737   do
 738   {
 739     (void) TransformImageColorspace(image,sRGBColorspace,exception);
 740     count=GetNumberColors(image,NULL,exception);
 741     for (bits_per_pixel=1;  (one << bits_per_pixel) < count; bits_per_pixel*=2) ;
 742     if (image_info->depth > 100)
 743       bits_per_pixel=image_info->depth-100;
 744     if (bits_per_pixel < 16)
 745       (void) TransformImageColorspace(image,image->colorspace,exception);
 746     if (bits_per_pixel < 8)
 747       {
 748         (void) TransformImageColorspace(image,GRAYColorspace,exception);
 749         (void) SetImageType(image,PaletteType,exception);
 750         (void) SortColormapByIntensity(image,exception);
 751       }
 752     if ((image->storage_class == PseudoClass) && (image->colors > 256))
 753       (void) SetImageStorageClass(image,DirectClass,exception);
 754     if (image->storage_class == PseudoClass)
 755       flags|=PALM_HAS_COLORMAP_FLAG;
 756     else
 757       flags|=PALM_IS_DIRECT_COLOR;
 758     (void) WriteBlobMSBShort(image,(unsigned short) image->columns); /* width */
 759     (void) WriteBlobMSBShort(image,(unsigned short) image->rows);  /* height */
 760     bytes_per_row=((image->columns+(16/bits_per_pixel-1))/(16/
 761       bits_per_pixel))*2;
 762     (void) WriteBlobMSBShort(image,(unsigned short) bytes_per_row);
 763     if ((image_info->compression == RLECompression) ||
 764         (image_info->compression == FaxCompression))
 765       flags|=PALM_IS_COMPRESSED_FLAG;
 766     (void) WriteBlobMSBShort(image, flags);
 767     (void) WriteBlobByte(image,(unsigned char) bits_per_pixel);
 768     if (bits_per_pixel > 1)
 769       version=1;
 770     if ((image_info->compression == RLECompression) ||
 771         (image_info->compression == FaxCompression))
 772       version=2;
 773     (void) WriteBlobByte(image,version);
 774     (void) WriteBlobMSBShort(image,0);  /* nextDepthOffset */
 775     (void) WriteBlobByte(image,(unsigned char) transparentIndex);
 776     if (image_info->compression == RLECompression)
 777       (void) WriteBlobByte(image,PALM_COMPRESSION_RLE);
 778     else
 779       if (image_info->compression == FaxCompression)
 780         (void) WriteBlobByte(image,PALM_COMPRESSION_SCANLINE);
 781       else
 782         (void) WriteBlobByte(image,PALM_COMPRESSION_NONE);
 783     (void) WriteBlobMSBShort(image,0);  /* reserved */
 784     offset=16;
 785     if (bits_per_pixel == 16)
 786       {
 787         (void) WriteBlobByte(image,5);  /* # of bits of red */
 788         (void) WriteBlobByte(image,6);  /* # of bits of green */
 789         (void) WriteBlobByte(image,5);  /* # of bits of blue */
 790         (void) WriteBlobByte(image,0);  /* reserved by Palm */
 791         (void) WriteBlobMSBLong(image,0);  /* no transparent color, YET */
 792         offset+=8;
 793       }
 794     if (bits_per_pixel == 8)
 795       {
 796         if (flags & PALM_HAS_COLORMAP_FLAG)  /* Write out colormap */
 797           {
 798             quantize_info->dither_method=IsPaletteImage(image,exception)
 799               == MagickFalse ? RiemersmaDitherMethod : NoDitherMethod;
 800             quantize_info->number_colors=image->colors;
 801             (void) QuantizeImage(quantize_info,image,exception);
 802             (void) WriteBlobMSBShort(image,(unsigned short) image->colors);
 803             for (count = 0; count < image->colors; count++)
 804             {
 805               (void) WriteBlobByte(image,(unsigned char) count);
 806               (void) WriteBlobByte(image,ScaleQuantumToChar(ClampToQuantum(
 807                 image->colormap[count].red)));
 808               (void) WriteBlobByte(image,ScaleQuantumToChar(ClampToQuantum(
 809                 image->colormap[count].green)));
 810               (void) WriteBlobByte(image,ScaleQuantumToChar(ClampToQuantum(
 811                 image->colormap[count].blue)));
 812             }
 813             offset+=2+count*4;
 814           }
 815       else  /* Map colors to Palm standard colormap */
 816         {
 817           Image
 818             *affinity_image;
 819
 820           affinity_image=ConstituteImage(256,1,"RGB",CharPixel,&PalmPalette,
 821             exception);
 822           (void) TransformImageColorspace(affinity_image,
 823             affinity_image->colorspace,exception);
 824           (void) RemapImage(quantize_info,image,affinity_image,exception);
 825           for (y=0; y < (ssize_t) image->rows; y++)
 826           {
 827             q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
 828             for (x=0; x < (ssize_t) image->columns; x++)
 829             {
 830               SetPixelIndex(image,(Quantum) FindColor(&image->colormap[(ssize_t)
 831                 GetPixelIndex(image,q)]),q);
 832               q+=GetPixelChannels(image);
 833             }
 834           }
 835           affinity_image=DestroyImage(affinity_image);
 836         }
 837       }
 838     if (flags & PALM_IS_COMPRESSED_FLAG)
 839       (void) WriteBlobMSBShort(image,0);  /* fill in size later */
 840     lastrow=(unsigned char *) NULL;
 841     if (image_info->compression == FaxCompression)
 842       lastrow=(unsigned char *) AcquireQuantumMemory(bytes_per_row,
 843         sizeof(*lastrow));
 844       /* TODO check whether memory really was acquired? */
 845     one_row=(unsigned char *) AcquireQuantumMemory(bytes_per_row,
 846       sizeof(*one_row));
 847     if (one_row == (unsigned char *) NULL)
 848       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 849     for (y=0; y < (ssize_t) image->rows; y++)
 850     {
 851       ptr=one_row;
 852       (void) ResetMagickMemory(ptr,0,bytes_per_row);
 853       p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 854       if (p == (const Quantum *) NULL)
 855         break;
 856       if (bits_per_pixel == 16)
 857         {
 858           for (x=0; x < (ssize_t) image->columns; x++)
 859           {
 860             color16=(unsigned short) ((((31*(size_t) GetPixelRed(image,p))/
 861               (size_t) QuantumRange) << 11) | (((63*(size_t)
 862               GetPixelGreen(image,p))/(size_t) QuantumRange) << 5) |
 863               ((31*(size_t) GetPixelBlue(image,p))/(size_t) QuantumRange));
 864             if (GetPixelAlpha(image,p) == (Quantum) TransparentAlpha)
 865               {
 866                 transpix.red=(MagickRealType) GetPixelRed(image,p);
 867                 transpix.green=(MagickRealType) GetPixelGreen(image,p);
 868                 transpix.blue=(MagickRealType) GetPixelBlue(image,p);
 869                 transpix.alpha=(MagickRealType) GetPixelAlpha(image,p);
 870                 flags|=PALM_HAS_TRANSPARENCY_FLAG;
 871               }
 872             *ptr++=(unsigned char) ((color16 >> 8) & 0xff);
 873             *ptr++=(unsigned char) (color16 & 0xff);
 874             p+=GetPixelChannels(image);
 875           }
 876         }
 877       else
 878         {
 879           byte=0x00;
 880           bit=(unsigned char) (8-bits_per_pixel);
 881           for (x=0; x < (ssize_t) image->columns; x++)
 882           {
 883             if (bits_per_pixel >= 8)
 884               color=(unsigned char) GetPixelIndex(image,p);
 885             else
 886               color=(unsigned char) (GetPixelIndex(image,p)*
 887                 ((one << bits_per_pixel)-1)/MagickMax(1*image->colors-1,1));
 888             byte|=color << bit;
 889             if (bit != 0)
 890               bit-=(unsigned char) bits_per_pixel;
 891             else
 892               {
 893                 *ptr++=byte;
 894                 byte=0x00;
 895                 bit=(unsigned char) (8-bits_per_pixel);
 896               }
 897             p+=GetPixelChannels(image);
 898           }
 899           if ((image->columns % (8/bits_per_pixel)) != 0)
 900             *ptr++=byte;
 901         }
 902       if (image_info->compression == RLECompression)
 903         {
 904           x=0;
 905           while (x < (ssize_t) bytes_per_row)
 906           {
 907             byte=one_row[x];
 908             count=1;
 909             while ((one_row[++x] == byte) && (count < 255) &&
 910                    (x < (ssize_t) bytes_per_row))
 911               count++;
 912             (void) WriteBlobByte(image,(unsigned char) count);
 913             (void) WriteBlobByte(image,(unsigned char) byte);
 914           }
 915         }
 916       else
 917         if (image_info->compression == FaxCompression)
 918           {
 919             char
 920               tmpbuf[8],
 921               *tptr;
 922
 923             for (x = 0;  x < (ssize_t) bytes_per_row;  x += 8)
 924             {
 925               tptr = tmpbuf;
 926               for (bit=0, byte=0; bit < (unsigned char) MagickMin(8,(ssize_t) bytes_per_row-x); bit++)
 927               {
 928                 if ((y == 0) || (lastrow[x + bit] != one_row[x + bit]))
 929                   {
 930                     byte |= (1 << (7 - bit));
 931                     *tptr++ = (char) one_row[x + bit];
 932                   }
 933               }
 934               (void) WriteBlobByte(image, byte);
 935               (void) WriteBlob(image,tptr-tmpbuf,(unsigned char *) tmpbuf);
 936             }
 937             (void) CopyMagickMemory(lastrow,one_row,bytes_per_row);
 938           }
 939         else
 940           (void) WriteBlob(image,bytes_per_row,one_row);
 941       }
 942     if (flags & PALM_HAS_TRANSPARENCY_FLAG)
 943       {
 944         offset=SeekBlob(image,currentOffset+6,SEEK_SET);
 945         (void) WriteBlobMSBShort(image,flags);
 946         offset=SeekBlob(image,currentOffset+12,SEEK_SET);
 947         (void) WriteBlobByte(image,(unsigned char) transparentIndex);  /* trans index */
 948       }
 949     if (bits_per_pixel == 16)
 950       {
 951         offset=SeekBlob(image,currentOffset+20,SEEK_SET);
 952         (void) WriteBlobByte(image,0);  /* reserved by Palm */
 953         (void) WriteBlobByte(image,(unsigned char) ((31*transpix.red)/QuantumRange));
 954         (void) WriteBlobByte(image,(unsigned char) ((63*transpix.green)/QuantumRange));
 955         (void) WriteBlobByte(image,(unsigned char) ((31*transpix.blue)/QuantumRange));
 956       }
 957     if (flags & PALM_IS_COMPRESSED_FLAG)  /* fill in size now */
 958       {
 959         offset=SeekBlob(image,currentOffset+offset,SEEK_SET);
 960         (void) WriteBlobMSBShort(image,(unsigned short) (GetBlobSize(image)-
 961           currentOffset-offset));
 962       }
 963     if (one_row != (unsigned char *) NULL)
 964       one_row=(unsigned char *) RelinquishMagickMemory(one_row);
 965     if (lastrow != (unsigned char *) NULL)
 966       lastrow=(unsigned char *) RelinquishMagickMemory(lastrow);
 967     if (GetNextImageInList(image) == (Image *) NULL)
 968       break;
 969     /* padding to 4 byte word */
 970     for (cc = (GetBlobSize(image))%4; cc > 0; cc--)
 971     {
 972       (void) WriteBlobByte(image,0);
 973     }
 974     /* write nextDepthOffset and return to end of image */
 975     offset=SeekBlob(image,currentOffset+10,SEEK_SET);
 976     nextDepthOffset=(size_t) ((GetBlobSize(image)-currentOffset)/4);
 977     (void) WriteBlobMSBShort(image,(unsigned short) nextDepthOffset);
 978     currentOffset=(MagickOffsetType) GetBlobSize(image);
 979     offset=SeekBlob(image,currentOffset,SEEK_SET);
 980     image=SyncNextImageInList(image);
 981     status=SetImageProgress(image,SaveImagesTag,scene++,
 982       GetImageListLength(image));
 983     if (status == MagickFalse)
 984       break;
 985   } while (image_info->adjoin != MagickFalse);
 986   quantize_info=DestroyQuantizeInfo(quantize_info);
 987   (void) CloseBlob(image);
 988   return(MagickTrue);
 989 }