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