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 1999-2011 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 "MagickCore/studio.h"
  43 #include "MagickCore/attribute.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/color.h"
  48 #include "MagickCore/color-private.h"
  49 #include "MagickCore/colormap.h"
  50 #include "MagickCore/colormap-private.h"
  51 #include "MagickCore/colorspace.h"
  52 #include "MagickCore/exception.h"
  53 #include "MagickCore/exception-private.h"
  54 #include "MagickCore/histogram.h"
  55 #include "MagickCore/image.h"
  56 #include "MagickCore/image-private.h"
  57 #include "MagickCore/list.h"
  58 #include "MagickCore/magick.h"
  59 #include "MagickCore/memory_.h"
  60 #include "MagickCore/pixel-accessor.h"
  61 #include "MagickCore/quantum-private.h"
  62 #include "MagickCore/static.h"
  63 #include "MagickCore/statistic.h"
  64 #include "MagickCore/string_.h"
  65 #include "MagickCore/module.h"
  66 \f
  67 /*
  68   Forward declarations.
  69 */
  70 static MagickBooleanType
  71   WriteMAPImage(const ImageInfo *,Image *);
  72 \f
  73 /*
  74 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  75 %                                                                             %
  76 %                                                                             %
  77 %                                                                             %
  78 %   R e a d M A P I m a g e                                                   %
  79 %                                                                             %
  80 %                                                                             %
  81 %                                                                             %
  82 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  83 %
  84 %  ReadMAPImage() reads an image of raw RGB colormap and colormap index
  85 %  bytes and returns it.  It allocates the memory necessary for the new Image
  86 %  structure and returns a pointer to the new image.
  87 %
  88 %  The format of the ReadMAPImage method is:
  89 %
  90 %      Image *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception)
  91 %
  92 %  A description of each parameter follows:
  93 %
  94 %    o image_info: the image info.
  95 %
  96 %    o exception: return any errors or warnings in this structure.
  97 %
  98 */
  99 static Image *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception)
 100 {
 101   Image
 102     *image;
 103
 104   MagickBooleanType
 105     status;
 106
 107   Quantum
 108     index;
 109
 110   register ssize_t
 111     x;
 112
 113   register Quantum
 114     *q;
 115
 116   register ssize_t
 117     i;
 118
 119   register unsigned char
 120     *p;
 121
 122   size_t
 123     depth,
 124     packet_size,
 125     quantum;
 126
 127   ssize_t
 128     count,
 129     y;
 130
 131   unsigned char
 132     *colormap,
 133     *pixels;
 134
 135   /*
 136     Open image file.
 137   */
 138   assert(image_info != (const ImageInfo *) NULL);
 139   assert(image_info->signature == MagickSignature);
 140   if (image_info->debug != MagickFalse)
 141     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 142       image_info->filename);
 143   assert(exception != (ExceptionInfo *) NULL);
 144   assert(exception->signature == MagickSignature);
 145   image=AcquireImage(image_info);
 146   if ((image->columns == 0) || (image->rows == 0))
 147     ThrowReaderException(OptionError,"MustSpecifyImageSize");
 148   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 149   if (status == MagickFalse)
 150     {
 151       image=DestroyImageList(image);
 152       return((Image *) NULL);
 153     }
 154   /*
 155     Initialize image structure.
 156   */
 157   image->storage_class=PseudoClass;
 158   status=AcquireImageColormap(image,(size_t)
 159     (image->offset != 0 ? image->offset : 256));
 160   if (status == MagickFalse)
 161     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 162   depth=GetImageQuantumDepth(image,MagickTrue);
 163   packet_size=(size_t) (depth/8);
 164   pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
 165     sizeof(*pixels));
 166   packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL);
 167   colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size*
 168     sizeof(*colormap));
 169   if ((pixels == (unsigned char *) NULL) ||
 170       (colormap == (unsigned char *) NULL))
 171     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 172   /*
 173     Read image colormap.
 174   */
 175   count=ReadBlob(image,packet_size*image->colors,colormap);
 176   if (count != (ssize_t) (packet_size*image->colors))
 177     ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
 178   p=colormap;
 179   if (image->depth <= 8)
 180     for (i=0; i < (ssize_t) image->colors; i++)
 181     {
 182       image->colormap[i].red=ScaleCharToQuantum(*p++);
 183       image->colormap[i].green=ScaleCharToQuantum(*p++);
 184       image->colormap[i].blue=ScaleCharToQuantum(*p++);
 185     }
 186   else
 187     for (i=0; i < (ssize_t) image->colors; i++)
 188     {
 189       quantum=(*p++ << 8);
 190       quantum|=(*p++);
 191       image->colormap[i].red=(Quantum) quantum;
 192       quantum=(*p++ << 8);
 193       quantum|=(*p++);
 194       image->colormap[i].green=(Quantum) quantum;
 195       quantum=(*p++ << 8);
 196       quantum|=(*p++);
 197       image->colormap[i].blue=(Quantum) quantum;
 198     }
 199   colormap=(unsigned char *) RelinquishMagickMemory(colormap);
 200   if (image_info->ping != MagickFalse)
 201     {
 202       (void) CloseBlob(image);
 203       return(GetFirstImageInList(image));
 204     }
 205   /*
 206     Read image pixels.
 207   */
 208   packet_size=(size_t) (depth/8);
 209   for (y=0; y < (ssize_t) image->rows; y++)
 210   {
 211     p=pixels;
 212     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 213     if (q == (const Quantum *) NULL)
 214       break;
 215     count=ReadBlob(image,(size_t) packet_size*image->columns,pixels);
 216     if (count != (ssize_t) (packet_size*image->columns))
 217       break;
 218     for (x=0; x < (ssize_t) image->columns; x++)
 219     {
 220       index=ConstrainColormapIndex(image,*p);
 221       p++;
 222       if (image->colors > 256)
 223         {
 224           index=ConstrainColormapIndex(image,((size_t) index << 8)+(*p));
 225           p++;
 226         }
 227       SetPixelIndex(image,index,q);
 228       SetPixelPacket(image,image->colormap+(ssize_t) index,q);
 229       q+=GetPixelChannels(image);
 230     }
 231     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 232       break;
 233   }
 234   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 235   if (y < (ssize_t) image->rows)
 236     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 237       image->filename);
 238   (void) CloseBlob(image);
 239   return(GetFirstImageInList(image));
 240 }
 241 \f
 242 /*
 243 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 244 %                                                                             %
 245 %                                                                             %
 246 %                                                                             %
 247 %   R e g i s t e r M A P I m a g e                                           %
 248 %                                                                             %
 249 %                                                                             %
 250 %                                                                             %
 251 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 252 %
 253 %  RegisterMAPImage() adds attributes for the MAP image format to
 254 %  the list of supported formats.  The attributes include the image format
 255 %  tag, a method to read and/or write the format, whether the format
 256 %  supports the saving of more than one frame to the same file or blob,
 257 %  whether the format supports native in-memory I/O, and a brief
 258 %  description of the format.
 259 %
 260 %  The format of the RegisterMAPImage method is:
 261 %
 262 %      size_t RegisterMAPImage(void)
 263 %
 264 */
 265 ModuleExport size_t RegisterMAPImage(void)
 266 {
 267   MagickInfo
 268     *entry;
 269
 270   entry=SetMagickInfo("MAP");
 271   entry->decoder=(DecodeImageHandler *) ReadMAPImage;
 272   entry->encoder=(EncodeImageHandler *) WriteMAPImage;
 273   entry->adjoin=MagickFalse;
 274   entry->format_type=ExplicitFormatType;
 275   entry->raw=MagickTrue;
 276   entry->endian_support=MagickTrue;
 277   entry->description=ConstantString("Colormap intensities and indices");
 278   entry->module=ConstantString("MAP");
 279   (void) RegisterMagickInfo(entry);
 280   return(MagickImageCoderSignature);
 281 }
 282 \f
 283 /*
 284 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 285 %                                                                             %
 286 %                                                                             %
 287 %                                                                             %
 288 %   U n r e g i s t e r M A P I m a g e                                       %
 289 %                                                                             %
 290 %                                                                             %
 291 %                                                                             %
 292 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 293 %
 294 %  UnregisterMAPImage() removes format registrations made by the
 295 %  MAP module from the list of supported formats.
 296 %
 297 %  The format of the UnregisterMAPImage method is:
 298 %
 299 %      UnregisterMAPImage(void)
 300 %
 301 */
 302 ModuleExport void UnregisterMAPImage(void)
 303 {
 304   (void) UnregisterMagickInfo("MAP");
 305 }
 306 \f
 307 /*
 308 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 309 %                                                                             %
 310 %                                                                             %
 311 %                                                                             %
 312 %   W r i t e M A P I m a g e                                                 %
 313 %                                                                             %
 314 %                                                                             %
 315 %                                                                             %
 316 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 317 %
 318 %  WriteMAPImage() writes an image to a file as red, green, and blue
 319 %  colormap bytes followed by the colormap indexes.
 320 %
 321 %  The format of the WriteMAPImage method is:
 322 %
 323 %      MagickBooleanType WriteMAPImage(const ImageInfo *image_info,Image *image)
 324 %
 325 %  A description of each parameter follows.
 326 %
 327 %    o image_info: the image info.
 328 %
 329 %    o image:  The image.
 330 %
 331 %
 332 */
 333 static MagickBooleanType WriteMAPImage(const ImageInfo *image_info,Image *image)
 334 {
 335   MagickBooleanType
 336     status;
 337
 338   register const Quantum
 339     *p;
 340
 341   register ssize_t
 342     i,
 343     x;
 344
 345   register unsigned char
 346     *q;
 347
 348   size_t
 349     depth,
 350     packet_size;
 351
 352   ssize_t
 353     y;
 354
 355   unsigned char
 356     *colormap,
 357     *pixels;
 358
 359   /*
 360     Open output image file.
 361   */
 362   assert(image_info != (const ImageInfo *) NULL);
 363   assert(image_info->signature == MagickSignature);
 364   assert(image != (Image *) NULL);
 365   assert(image->signature == MagickSignature);
 366   if (image->debug != MagickFalse)
 367     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 368   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 369   if (status == MagickFalse)
 370     return(status);
 371   if (image->colorspace != RGBColorspace)
 372     (void) TransformImageColorspace(image,RGBColorspace);
 373   /*
 374     Allocate colormap.
 375   */
 376   if (IsPaletteImage(image,&image->exception) == MagickFalse)
 377     (void) SetImageType(image,PaletteType);
 378   depth=GetImageQuantumDepth(image,MagickTrue);
 379   packet_size=(size_t) (depth/8);
 380   pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
 381     sizeof(*pixels));
 382   packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL);
 383   colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size*
 384     sizeof(*colormap));
 385   if ((pixels == (unsigned char *) NULL) ||
 386       (colormap == (unsigned char *) NULL))
 387     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 388   /*
 389     Write colormap to file.
 390   */
 391   q=colormap;
 392   if (image->depth <= 8)
 393     for (i=0; i < (ssize_t) image->colors; i++)
 394     {
 395       *q++=(unsigned char) image->colormap[i].red;
 396       *q++=(unsigned char) image->colormap[i].green;
 397       *q++=(unsigned char) image->colormap[i].blue;
 398     }
 399   else
 400     for (i=0; i < (ssize_t) image->colors; i++)
 401     {
 402       *q++=(unsigned char) ((size_t) image->colormap[i].red >> 8);
 403       *q++=(unsigned char) image->colormap[i].red;
 404       *q++=(unsigned char) ((size_t) image->colormap[i].green >> 8);
 405       *q++=(unsigned char) image->colormap[i].green;
 406       *q++=(unsigned char) ((size_t) image->colormap[i].blue >> 8);
 407       *q++=(unsigned char) image->colormap[i].blue;
 408     }
 409   (void) WriteBlob(image,packet_size*image->colors,colormap);
 410   colormap=(unsigned char *) RelinquishMagickMemory(colormap);
 411   /*
 412     Write image pixels to file.
 413   */
 414   for (y=0; y < (ssize_t) image->rows; y++)
 415   {
 416     p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 417     if (p == (const Quantum *) NULL)
 418       break;
 419     q=pixels;
 420     for (x=0; x < (ssize_t) image->columns; x++)
 421     {
 422       if (image->colors > 256)
 423         *q++=(unsigned char) ((size_t) GetPixelIndex(image,p) >> 8);
 424       *q++=(unsigned char) GetPixelIndex(image,p);
 425       p+=GetPixelChannels(image);
 426     }
 427     (void) WriteBlob(image,(size_t) (q-pixels),pixels);
 428   }
 429   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 430   (void) CloseBlob(image);
 431   return(status);
 432 }