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