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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            RRRR   L       AAA                               %
   7 %                            R   R  L      A   A                              %
   8 %                            RRRR   L      AAAAA                              %
   9 %                            R R    L      A   A                              %
  10 %                            R  R   LLLLL  A   A                              %
  11 %                                                                             %
  12 %                                                                             %
  13 %                      Read Alias/Wavefront Image Format                      %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2017 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 %    https://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/property.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/exception.h"
  48 #include "MagickCore/exception-private.h"
  49 #include "MagickCore/image.h"
  50 #include "MagickCore/image-private.h"
  51 #include "MagickCore/list.h"
  52 #include "MagickCore/magick.h"
  53 #include "MagickCore/memory_.h"
  54 #include "MagickCore/monitor.h"
  55 #include "MagickCore/monitor-private.h"
  56 #include "MagickCore/pixel-accessor.h"
  57 #include "MagickCore/quantum-private.h"
  58 #include "MagickCore/static.h"
  59 #include "MagickCore/string_.h"
  60 #include "MagickCore/module.h"
  61 \f
  62 /*
  63 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  64 %                                                                             %
  65 %                                                                             %
  66 %                                                                             %
  67 %   R e a d R L A I m a g e                                                   %
  68 %                                                                             %
  69 %                                                                             %
  70 %                                                                             %
  71 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  72 %
  73 %  ReadRLAImage() reads a run-length encoded Wavefront RLA image file
  74 %  and returns it.  It allocates the memory necessary for the new Image
  75 %  structure and returns a pointer to the new image.
  76 %
  77 %  Note:  This module was contributed by Lester Vecsey (master@internexus.net).
  78 %
  79 %  The format of the ReadRLAImage method is:
  80 %
  81 %      Image *ReadRLAImage(const ImageInfo *image_info,ExceptionInfo *exception)
  82 %
  83 %  A description of each parameter follows:
  84 %
  85 %    o image_info: the image info.
  86 %
  87 %    o exception: return any errors or warnings in this structure.
  88 %
  89 */
  90 static Image *ReadRLAImage(const ImageInfo *image_info,ExceptionInfo *exception)
  91 {
  92   typedef struct _WindowFrame
  93   {
  94     short
  95       left,
  96       right,
  97       bottom,
  98       top;
  99   } WindowFrame;
 100
 101   typedef struct _RLAInfo
 102   {
 103     WindowFrame
 104       window,
 105       active_window;
 106
 107     short
 108       frame,
 109       storage_type,
 110       number_channels,
 111       number_matte_channels,
 112       number_auxiliary_channels,
 113       revision;
 114
 115     char
 116       gamma[16+1],
 117       red_primary[24+1],
 118       green_primary[24+1],
 119       blue_primary[24+1],
 120       white_point[24+1];
 121
 122     int
 123       job_number;
 124
 125     char
 126       name[128+1],
 127       description[128+1],
 128       program[64+1],
 129       machine[32+1],
 130       user[32+1],
 131       date[20+1],
 132       aspect[24+1],
 133       aspect_ratio[8+1],
 134       chan[32+1];
 135
 136     short
 137       field;
 138
 139     char
 140       time[12],
 141       filter[32];
 142
 143     short
 144       bits_per_channel,
 145       matte_type,
 146       matte_bits,
 147       auxiliary_type,
 148       auxiliary_bits;
 149
 150     char
 151       auxiliary[32+1],
 152       space[36+1];
 153
 154     int
 155       next;
 156   } RLAInfo;
 157
 158   Image
 159     *image;
 160
 161   int
 162     channel,
 163     length,
 164     runlength;
 165
 166   MagickBooleanType
 167     status;
 168
 169   MagickOffsetType
 170     offset,
 171     *scanlines;
 172
 173   register ssize_t
 174     i,
 175     x;
 176
 177   register Quantum
 178     *q;
 179
 180   ssize_t
 181     count,
 182     y;
 183
 184   RLAInfo
 185     rla_info;
 186
 187   unsigned char
 188     byte;
 189
 190   /*
 191     Open image file.
 192   */
 193   assert(image_info != (const ImageInfo *) NULL);
 194   assert(image_info->signature == MagickCoreSignature);
 195   if (image_info->debug != MagickFalse)
 196     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 197       image_info->filename);
 198   assert(exception != (ExceptionInfo *) NULL);
 199   assert(exception->signature == MagickCoreSignature);
 200   image=AcquireImage(image_info,exception);
 201   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 202   if (status == MagickFalse)
 203     {
 204       image=DestroyImageList(image);
 205       return((Image *) NULL);
 206     }
 207   (void) ResetMagickMemory(&rla_info,0,sizeof(rla_info));
 208   rla_info.window.left=(short) ReadBlobMSBShort(image);
 209   rla_info.window.right=(short) ReadBlobMSBShort(image);
 210   rla_info.window.bottom=(short) ReadBlobMSBShort(image);
 211   rla_info.window.top=(short) ReadBlobMSBShort(image);
 212   rla_info.active_window.left=(short) ReadBlobMSBShort(image);
 213   rla_info.active_window.right=(short) ReadBlobMSBShort(image);
 214   rla_info.active_window.bottom=(short) ReadBlobMSBShort(image);
 215   rla_info.active_window.top=(short) ReadBlobMSBShort(image);
 216   rla_info.frame=(short) ReadBlobMSBShort(image);
 217   rla_info.storage_type=(short) ReadBlobMSBShort(image);
 218   rla_info.number_channels=(short) ReadBlobMSBShort(image);
 219   rla_info.number_matte_channels=(short) ReadBlobMSBShort(image);
 220   if (rla_info.number_channels == 0)
 221     rla_info.number_channels=3;
 222   rla_info.number_channels+=rla_info.number_matte_channels;
 223   rla_info.number_auxiliary_channels=(short) ReadBlobMSBShort(image);
 224   rla_info.revision=(short) ReadBlobMSBShort(image);
 225   count=ReadBlob(image,16,(unsigned char *) rla_info.gamma);
 226   count=ReadBlob(image,24,(unsigned char *) rla_info.red_primary);
 227   count=ReadBlob(image,24,(unsigned char *) rla_info.green_primary);
 228   count=ReadBlob(image,24,(unsigned char *) rla_info.blue_primary);
 229   count=ReadBlob(image,24,(unsigned char *) rla_info.white_point);
 230   rla_info.job_number=ReadBlobMSBSignedLong(image);
 231   count=ReadBlob(image,128,(unsigned char *) rla_info.name);
 232   count=ReadBlob(image,128,(unsigned char *) rla_info.description);
 233   rla_info.description[127]='\0';
 234   count=ReadBlob(image,64,(unsigned char *) rla_info.program);
 235   count=ReadBlob(image,32,(unsigned char *) rla_info.machine);
 236   count=ReadBlob(image,32,(unsigned char *) rla_info.user);
 237   count=ReadBlob(image,20,(unsigned char *) rla_info.date);
 238   count=ReadBlob(image,24,(unsigned char *) rla_info.aspect);
 239   count=ReadBlob(image,8,(unsigned char *) rla_info.aspect_ratio);
 240   count=ReadBlob(image,32,(unsigned char *) rla_info.chan);
 241   rla_info.field=(short) ReadBlobMSBShort(image);
 242   count=ReadBlob(image,12,(unsigned char *) rla_info.time);
 243   count=ReadBlob(image,32,(unsigned char *) rla_info.filter);
 244   rla_info.bits_per_channel=(short) ReadBlobMSBShort(image);
 245   rla_info.matte_type=(short) ReadBlobMSBShort(image);
 246   rla_info.matte_bits=(short) ReadBlobMSBShort(image);
 247   rla_info.auxiliary_type=(short) ReadBlobMSBShort(image);
 248   rla_info.auxiliary_bits=(short) ReadBlobMSBShort(image);
 249   count=ReadBlob(image,32,(unsigned char *) rla_info.auxiliary);
 250   count=ReadBlob(image,36,(unsigned char *) rla_info.space);
 251   if ((size_t) count != 36)
 252     ThrowReaderException(CorruptImageError,"UnableToReadImageData");
 253   rla_info.next=ReadBlobMSBSignedLong(image);
 254   /*
 255     Initialize image structure.
 256   */
 257   image->alpha_trait=rla_info.number_matte_channels != 0 ? BlendPixelTrait :
 258     UndefinedPixelTrait;
 259   image->columns=(size_t) (rla_info.active_window.right-
 260     rla_info.active_window.left+1);
 261   image->rows=(size_t) (rla_info.active_window.top-
 262     rla_info.active_window.bottom+1);
 263   if (image_info->ping != MagickFalse)
 264     {
 265       (void) CloseBlob(image);
 266       return(GetFirstImageInList(image));
 267     }
 268   status=SetImageExtent(image,image->columns,image->rows,exception);
 269   if (status == MagickFalse)
 270     return(DestroyImageList(image));
 271   scanlines=(MagickOffsetType *) AcquireQuantumMemory(image->rows,
 272     sizeof(*scanlines));
 273   if (scanlines == (MagickOffsetType *) NULL)
 274     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 275   if (*rla_info.description != '\0')
 276     (void) SetImageProperty(image,"comment",rla_info.description,exception);
 277   /*
 278     Read offsets to each scanline data.
 279   */
 280   for (i=0; i < (ssize_t) image->rows; i++)
 281     scanlines[i]=(MagickOffsetType) ReadBlobMSBSignedLong(image);
 282   /*
 283     Read image data.
 284   */
 285   x=0;
 286   for (y=0; y < (ssize_t) image->rows; y++)
 287   {
 288     offset=SeekBlob(image,scanlines[image->rows-y-1],SEEK_SET);
 289     if (offset < 0)
 290       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 291     for (channel=0; channel < (int) rla_info.number_channels; channel++)
 292     {
 293       length=ReadBlobMSBSignedShort(image);
 294       while (length > 0)
 295       {
 296         byte=(unsigned char) ReadBlobByte(image);
 297         runlength=byte;
 298         if (byte > 127)
 299           runlength=byte-256;
 300         length--;
 301         if (length == 0)
 302           break;
 303         if (runlength < 0)
 304           {
 305             while (runlength < 0)
 306             {
 307               q=GetAuthenticPixels(image,(ssize_t) (x % image->columns),
 308                 (ssize_t) (y % image->rows),1,1,exception);
 309               if (q == (Quantum *) NULL)
 310                 break;
 311               byte=(unsigned char) ReadBlobByte(image);
 312               length--;
 313               switch (channel)
 314               {
 315                 case 0:
 316                 {
 317                   SetPixelRed(image,ScaleCharToQuantum(byte),q);
 318                   break;
 319                 }
 320                 case 1:
 321                 {
 322                   SetPixelGreen(image,ScaleCharToQuantum(byte),q);
 323                   break;
 324                 }
 325                 case 2:
 326                 {
 327                   SetPixelBlue(image,ScaleCharToQuantum(byte),q);
 328                   break;
 329                 }
 330                 case 3:
 331                 default:
 332                 {
 333                   SetPixelAlpha(image,ScaleCharToQuantum(byte),q);
 334                   break;
 335                 }
 336               }
 337               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 338                 break;
 339               x++;
 340               runlength++;
 341             }
 342             continue;
 343           }
 344         byte=(unsigned char) ReadBlobByte(image);
 345         length--;
 346         runlength++;
 347         do
 348         {
 349           q=GetAuthenticPixels(image,(ssize_t) (x % image->columns),
 350             (ssize_t) (y % image->rows),1,1,exception);
 351           if (q == (Quantum *) NULL)
 352             break;
 353           switch (channel)
 354           {
 355             case 0:
 356             {
 357               SetPixelRed(image,ScaleCharToQuantum(byte),q);
 358               break;
 359             }
 360             case 1:
 361             {
 362               SetPixelGreen(image,ScaleCharToQuantum(byte),q);
 363               break;
 364             }
 365             case 2:
 366             {
 367               SetPixelBlue(image,ScaleCharToQuantum(byte),q);
 368               break;
 369             }
 370             case 3:
 371             default:
 372             {
 373               SetPixelAlpha(image,ScaleCharToQuantum(byte),q);
 374               break;
 375             }
 376           }
 377           if (SyncAuthenticPixels(image,exception) == MagickFalse)
 378             break;
 379           x++;
 380           runlength--;
 381         }
 382         while (runlength > 0);
 383       }
 384     }
 385     status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 386       image->rows);
 387     if (status == MagickFalse)
 388       break;
 389   }
 390   if (EOFBlob(image) != MagickFalse)
 391     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 392       image->filename);
 393   scanlines=(MagickOffsetType *) RelinquishMagickMemory(scanlines);
 394   (void) CloseBlob(image);
 395   return(GetFirstImageInList(image));
 396 }
 397 \f
 398 /*
 399 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 400 %                                                                             %
 401 %                                                                             %
 402 %                                                                             %
 403 %   R e g i s t e r R L A I m a g e                                           %
 404 %                                                                             %
 405 %                                                                             %
 406 %                                                                             %
 407 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 408 %
 409 %  RegisterRLAImage() adds attributes for the RLA image format to
 410 %  the list of supported formats.  The attributes include the image format
 411 %  tag, a method to read and/or write the format, whether the format
 412 %  supports the saving of more than one frame to the same file or blob,
 413 %  whether the format supports native in-memory I/O, and a brief
 414 %  description of the format.
 415 %
 416 %  The format of the RegisterRLAImage method is:
 417 %
 418 %      size_t RegisterRLAImage(void)
 419 %
 420 */
 421 ModuleExport size_t RegisterRLAImage(void)
 422 {
 423   MagickInfo
 424     *entry;
 425
 426   entry=AcquireMagickInfo("RLA","RLA","Alias/Wavefront image");
 427   entry->decoder=(DecodeImageHandler *) ReadRLAImage;
 428   entry->flags^=CoderAdjoinFlag;
 429   entry->flags|=CoderDecoderSeekableStreamFlag;
 430   (void) RegisterMagickInfo(entry);
 431   return(MagickImageCoderSignature);
 432 }
 433 \f
 434 /*
 435 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 436 %                                                                             %
 437 %                                                                             %
 438 %                                                                             %
 439 %   U n r e g i s t e r R L A I m a g e                                       %
 440 %                                                                             %
 441 %                                                                             %
 442 %                                                                             %
 443 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 444 %
 445 %  UnregisterRLAImage() removes format registrations made by the
 446 %  RLA module from the list of supported formats.
 447 %
 448 %  The format of the UnregisterRLAImage method is:
 449 %
 450 %      UnregisterRLAImage(void)
 451 %
 452 */
 453 ModuleExport void UnregisterRLAImage(void)
 454 {
 455   (void) UnregisterMagickInfo("RLA");
 456 }