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