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