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