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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            M   M   AAA   PPPP                               %
   7 %                            MM MM  A   A  P   P                              %
   8 %                            M M M  AAAAA  PPPP                               %
   9 %                            M   M  A   A  P                                  %
  10 %                            M   M  A   A  P                                  %
  11 %                                                                             %
  12 %                                                                             %
  13 %                  Read/Write Image Colormaps As An Image File.               %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2010 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 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "magick/studio.h"
  43 #include "magick/attribute.h"
  44 #include "magick/blob.h"
  45 #include "magick/blob-private.h"
  46 #include "magick/cache.h"
  47 #include "magick/color.h"
  48 #include "magick/color-private.h"
  49 #include "magick/colormap.h"
  50 #include "magick/colormap-private.h"
  51 #include "magick/colorspace.h"
  52 #include "magick/exception.h"
  53 #include "magick/exception-private.h"
  54 #include "magick/histogram.h"
  55 #include "magick/image.h"
  56 #include "magick/image-private.h"
  57 #include "magick/list.h"
  58 #include "magick/magick.h"
  59 #include "magick/memory_.h"
  60 #include "magick/quantum-private.h"
  61 #include "magick/static.h"
  62 #include "magick/statistic.h"
  63 #include "magick/string_.h"
  64 #include "magick/module.h"
  65 \f
  66 /*
  67   Forward declarations.
  68 */
  69 static MagickBooleanType
  70   WriteMAPImage(const ImageInfo *,Image *);
  71 \f
  72 /*
  73 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  74 %                                                                             %
  75 %                                                                             %
  76 %                                                                             %
  77 %   R e a d M A P I m a g e                                                   %
  78 %                                                                             %
  79 %                                                                             %
  80 %                                                                             %
  81 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  82 %
  83 %  ReadMAPImage() reads an image of raw RGB colormap and colormap index
  84 %  bytes and returns it.  It allocates the memory necessary for the new Image
  85 %  structure and returns a pointer to the new image.
  86 %
  87 %  The format of the ReadMAPImage method is:
  88 %
  89 %      Image *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception)
  90 %
  91 %  A description of each parameter follows:
  92 %
  93 %    o image_info: the image info.
  94 %
  95 %    o exception: return any errors or warnings in this structure.
  96 %
  97 */
  98 static Image *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception)
  99 {
 100   Image
 101     *image;
 102
 103   IndexPacket
 104     index;
 105
 106   long
 107     y;
 108
 109   MagickBooleanType
 110     status;
 111
 112   register IndexPacket
 113     *indexes;
 114
 115   register long
 116     x;
 117
 118   register PixelPacket
 119     *q;
 120
 121   register long
 122     i;
 123
 124   register unsigned char
 125     *p;
 126
 127   size_t
 128     packet_size;
 129
 130   ssize_t
 131     count;
 132
 133   unsigned char
 134     *colormap,
 135     *pixels;
 136
 137   unsigned long
 138     depth,
 139     quantum;
 140
 141   /*
 142     Open image file.
 143   */
 144   assert(image_info != (const ImageInfo *) NULL);
 145   assert(image_info->signature == MagickSignature);
 146   if (image_info->debug != MagickFalse)
 147     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 148       image_info->filename);
 149   assert(exception != (ExceptionInfo *) NULL);
 150   assert(exception->signature == MagickSignature);
 151   image=AcquireImage(image_info);
 152   if ((image->columns == 0) || (image->rows == 0))
 153     ThrowReaderException(OptionError,"MustSpecifyImageSize");
 154   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 155   if (status == MagickFalse)
 156     {
 157       image=DestroyImageList(image);
 158       return((Image *) NULL);
 159     }
 160   /*
 161     Initialize image structure.
 162   */
 163   image->storage_class=PseudoClass;
 164   status=AcquireImageColormap(image,(unsigned long)
 165     (image->offset != 0 ? image->offset : 256));
 166   if (status == MagickFalse)
 167     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 168   depth=GetImageQuantumDepth(image,MagickTrue);
 169   packet_size=(size_t) (depth/8);
 170   pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
 171     sizeof(*pixels));
 172   packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL);
 173   colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size*
 174     sizeof(*colormap));
 175   if ((pixels == (unsigned char *) NULL) ||
 176       (colormap == (unsigned char *) NULL))
 177     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 178   /*
 179     Read image colormap.
 180   */
 181   count=ReadBlob(image,packet_size*image->colors,colormap);
 182   if (count != (ssize_t) (packet_size*image->colors))
 183     ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
 184   p=colormap;
 185   if (image->depth <= 8)
 186     for (i=0; i < (long) image->colors; i++)
 187     {
 188       image->colormap[i].red=ScaleCharToQuantum(*p++);
 189       image->colormap[i].green=ScaleCharToQuantum(*p++);
 190       image->colormap[i].blue=ScaleCharToQuantum(*p++);
 191     }
 192   else
 193     for (i=0; i < (long) image->colors; i++)
 194     {
 195       quantum=(*p++ << 8);
 196       quantum|=(*p++);
 197       image->colormap[i].red=(Quantum) quantum;
 198       quantum=(*p++ << 8);
 199       quantum|=(*p++);
 200       image->colormap[i].green=(Quantum) quantum;
 201       quantum=(*p++ << 8);
 202       quantum|=(*p++);
 203       image->colormap[i].blue=(Quantum) quantum;
 204     }
 205   colormap=(unsigned char *) RelinquishMagickMemory(colormap);
 206   if (image_info->ping != MagickFalse)
 207     {
 208       (void) CloseBlob(image);
 209       return(GetFirstImageInList(image));
 210     }
 211   /*
 212     Read image pixels.
 213   */
 214   packet_size=(size_t) (depth/8);
 215   for (y=0; y < (long) image->rows; y++)
 216   {
 217     p=pixels;
 218     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 219     if (q == (PixelPacket *) NULL)
 220       break;
 221     indexes=GetAuthenticIndexQueue(image);
 222     count=ReadBlob(image,(size_t) packet_size*image->columns,pixels);
 223     if (count != (ssize_t) (packet_size*image->columns))
 224       break;
 225     for (x=0; x < (long) image->columns; x++)
 226     {
 227       index=ConstrainColormapIndex(image,*p);
 228       p++;
 229       if (image->colors > 256)
 230         {
 231           index=ConstrainColormapIndex(image,((unsigned long) index << 8)+(*p));
 232           p++;
 233         }
 234       indexes[x]=(IndexPacket) index;
 235       *q++=image->colormap[(long) index];
 236     }
 237     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 238       break;
 239   }
 240   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 241   if (y < (long) image->rows)
 242     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 243       image->filename);
 244   (void) CloseBlob(image);
 245   return(GetFirstImageInList(image));
 246 }
 247 \f
 248 /*
 249 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 250 %                                                                             %
 251 %                                                                             %
 252 %                                                                             %
 253 %   R e g i s t e r M A P I m a g e                                           %
 254 %                                                                             %
 255 %                                                                             %
 256 %                                                                             %
 257 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 258 %
 259 %  RegisterMAPImage() adds attributes for the MAP image format to
 260 %  the list of supported formats.  The attributes include the image format
 261 %  tag, a method to read and/or write the format, whether the format
 262 %  supports the saving of more than one frame to the same file or blob,
 263 %  whether the format supports native in-memory I/O, and a brief
 264 %  description of the format.
 265 %
 266 %  The format of the RegisterMAPImage method is:
 267 %
 268 %      unsigned long RegisterMAPImage(void)
 269 %
 270 */
 271 ModuleExport unsigned long RegisterMAPImage(void)
 272 {
 273   MagickInfo
 274     *entry;
 275
 276   entry=SetMagickInfo("MAP");
 277   entry->decoder=(DecodeImageHandler *) ReadMAPImage;
 278   entry->encoder=(EncodeImageHandler *) WriteMAPImage;
 279   entry->adjoin=MagickFalse;
 280   entry->format_type=ExplicitFormatType;
 281   entry->raw=MagickTrue;
 282   entry->endian_support=MagickTrue;
 283   entry->description=ConstantString("Colormap intensities and indices");
 284   entry->module=ConstantString("MAP");
 285   (void) RegisterMagickInfo(entry);
 286   return(MagickImageCoderSignature);
 287 }
 288 \f
 289 /*
 290 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 291 %                                                                             %
 292 %                                                                             %
 293 %                                                                             %
 294 %   U n r e g i s t e r M A P I m a g e                                       %
 295 %                                                                             %
 296 %                                                                             %
 297 %                                                                             %
 298 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 299 %
 300 %  UnregisterMAPImage() removes format registrations made by the
 301 %  MAP module from the list of supported formats.
 302 %
 303 %  The format of the UnregisterMAPImage method is:
 304 %
 305 %      UnregisterMAPImage(void)
 306 %
 307 */
 308 ModuleExport void UnregisterMAPImage(void)
 309 {
 310   (void) UnregisterMagickInfo("MAP");
 311 }
 312 \f
 313 /*
 314 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 315 %                                                                             %
 316 %                                                                             %
 317 %                                                                             %
 318 %   W r i t e M A P I m a g e                                                 %
 319 %                                                                             %
 320 %                                                                             %
 321 %                                                                             %
 322 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 323 %
 324 %  WriteMAPImage() writes an image to a file as red, green, and blue
 325 %  colormap bytes followed by the colormap indexes.
 326 %
 327 %  The format of the WriteMAPImage method is:
 328 %
 329 %      MagickBooleanType WriteMAPImage(const ImageInfo *image_info,Image *image)
 330 %
 331 %  A description of each parameter follows.
 332 %
 333 %    o image_info: the image info.
 334 %
 335 %    o image:  The image.
 336 %
 337 %
 338 */
 339 static MagickBooleanType WriteMAPImage(const ImageInfo *image_info,Image *image)
 340 {
 341   long
 342     y;
 343
 344   MagickBooleanType
 345     status;
 346
 347   register const IndexPacket
 348     *indexes;
 349
 350   register const PixelPacket
 351     *p;
 352
 353   register long
 354     i,
 355     x;
 356
 357   register unsigned char
 358     *q;
 359
 360   size_t
 361     packet_size;
 362
 363   unsigned char
 364     *colormap,
 365     *pixels;
 366
 367   unsigned long
 368     depth;
 369
 370   /*
 371     Open output image file.
 372   */
 373   assert(image_info != (const ImageInfo *) NULL);
 374   assert(image_info->signature == MagickSignature);
 375   assert(image != (Image *) NULL);
 376   assert(image->signature == MagickSignature);
 377   if (image->debug != MagickFalse)
 378     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 379   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 380   if (status == MagickFalse)
 381     return(status);
 382   if (image->colorspace != RGBColorspace)
 383     (void) TransformImageColorspace(image,RGBColorspace);
 384   /*
 385     Allocate colormap.
 386   */
 387   if (IsPaletteImage(image,&image->exception) == MagickFalse)
 388     (void) SetImageType(image,PaletteType);
 389   depth=GetImageQuantumDepth(image,MagickTrue);
 390   packet_size=(size_t) (depth/8);
 391   pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
 392     sizeof(*pixels));
 393   packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL);
 394   colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size*
 395     sizeof(*colormap));
 396   if ((pixels == (unsigned char *) NULL) ||
 397       (colormap == (unsigned char *) NULL))
 398     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 399   /*
 400     Write colormap to file.
 401   */
 402   q=colormap;
 403   if (image->depth <= 8)
 404     for (i=0; i < (long) image->colors; i++)
 405     {
 406       *q++=(unsigned char) image->colormap[i].red;
 407       *q++=(unsigned char) image->colormap[i].green;
 408       *q++=(unsigned char) image->colormap[i].blue;
 409     }
 410   else
 411     for (i=0; i < (long) image->colors; i++)
 412     {
 413       *q++=(unsigned char) ((unsigned long) image->colormap[i].red >> 8);
 414       *q++=(unsigned char) image->colormap[i].red;
 415       *q++=(unsigned char) ((unsigned long) image->colormap[i].green >> 8);
 416       *q++=(unsigned char) image->colormap[i].green;
 417       *q++=(unsigned char) ((unsigned long) image->colormap[i].blue >> 8);
 418       *q++=(unsigned char) image->colormap[i].blue;
 419     }
 420   (void) WriteBlob(image,packet_size*image->colors,colormap);
 421   colormap=(unsigned char *) RelinquishMagickMemory(colormap);
 422   /*
 423     Write image pixels to file.
 424   */
 425   for (y=0; y < (long) image->rows; y++)
 426   {
 427     p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 428     if (p == (const PixelPacket *) NULL)
 429       break;
 430     indexes=GetVirtualIndexQueue(image);
 431     q=pixels;
 432     for (x=0; x < (long) image->columns; x++)
 433     {
 434       if (image->colors > 256)
 435         *q++=(unsigned char) ((unsigned long) indexes[x] >> 8);
 436       *q++=(unsigned char) indexes[x];
 437     }
 438     (void) WriteBlob(image,(size_t) (q-pixels),pixels);
 439   }
 440   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 441   (void) CloseBlob(image);
 442   return(status);
 443 }