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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            PPPP   IIIII  X   X                              %
   7 %                            P   P    I     X X                               %
   8 %                            PPPP     I      X                                %
   9 %                            P        I     X X                               %
  10 %                            P      IIIII  X   X                              %
  11 %                                                                             %
  12 %                                                                             %
  13 %                    Read Alias/Wavefront RLE Image Format                    %
  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/blob.h"
  44 #include "magick/blob-private.h"
  45 #include "magick/cache.h"
  46 #include "magick/colormap.h"
  47 #include "magick/exception.h"
  48 #include "magick/exception-private.h"
  49 #include "magick/image.h"
  50 #include "magick/image-private.h"
  51 #include "magick/list.h"
  52 #include "magick/magick.h"
  53 #include "magick/memory_.h"
  54 #include "magick/monitor.h"
  55 #include "magick/monitor-private.h"
  56 #include "magick/quantum-private.h"
  57 #include "magick/static.h"
  58 #include "magick/string_.h"
  59 #include "magick/module.h"
  60 \f
  61 /*
  62 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  63 %                                                                             %
  64 %                                                                             %
  65 %                                                                             %
  66 %   R e a d P I X I m a g e                                                   %
  67 %                                                                             %
  68 %                                                                             %
  69 %                                                                             %
  70 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  71 %
  72 %  ReadPIXImage() reads a Alias/Wavefront RLE image file and returns it.
  73 %  It allocates the memory necessary for the new Image structure and returns a
  74 %  pointer to the new image.
  75 %
  76 %  The format of the ReadPIXImage method is:
  77 %
  78 %      Image *ReadPIXImage(const ImageInfo *image_info,ExceptionInfo *exception)
  79 %
  80 %  A description of each parameter follows:
  81 %
  82 %    o image_info: the image info.
  83 %
  84 %    o exception: return any errors or warnings in this structure.
  85 %
  86 %
  87 */
  88 static Image *ReadPIXImage(const ImageInfo *image_info,ExceptionInfo *exception)
  89 {
  90   Image
  91     *image;
  92
  93   IndexPacket
  94     index;
  95
  96   ssize_t
  97     y;
  98
  99   MagickBooleanType
 100     status;
 101
 102   Quantum
 103     blue,
 104     green,
 105     red;
 106
 107   register IndexPacket
 108     *indexes;
 109
 110   register ssize_t
 111     x;
 112
 113   register PixelPacket
 114     *q;
 115
 116   size_t
 117     length;
 118
 119   size_t
 120     bits_per_pixel,
 121     height,
 122     width;
 123
 124   /*
 125     Open image file.
 126   */
 127   assert(image_info != (const ImageInfo *) NULL);
 128   assert(image_info->signature == MagickSignature);
 129   if (image_info->debug != MagickFalse)
 130     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 131       image_info->filename);
 132   assert(exception != (ExceptionInfo *) NULL);
 133   assert(exception->signature == MagickSignature);
 134   image=AcquireImage(image_info);
 135   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 136   if (status == MagickFalse)
 137     {
 138       image=DestroyImageList(image);
 139       return((Image *) NULL);
 140     }
 141   /*
 142     Read PIX image.
 143   */
 144   width=ReadBlobMSBShort(image);
 145   height=ReadBlobMSBShort(image);
 146   (void) ReadBlobMSBShort(image);  /* x-offset */
 147   (void) ReadBlobMSBShort(image);  /* y-offset */
 148   bits_per_pixel=ReadBlobMSBShort(image);
 149   if ((width == 0UL) || (height == 0UL) || ((bits_per_pixel != 8) &&
 150       (bits_per_pixel != 24)))
 151     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 152   do
 153   {
 154     /*
 155       Initialize image structure.
 156     */
 157     image->columns=width;
 158     image->rows=height;
 159     if (bits_per_pixel == 8)
 160       if (AcquireImageColormap(image,256) == MagickFalse)
 161         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 162     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 163       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 164         break;
 165     /*
 166       Convert PIX raster image to pixel packets.
 167     */
 168     red=(Quantum) 0;
 169     green=(Quantum) 0;
 170     blue=(Quantum) 0;
 171     index=(IndexPacket) 0;
 172     length=0;
 173     for (y=0; y < (ssize_t) image->rows; y++)
 174     {
 175       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 176       if (q == (PixelPacket *) NULL)
 177         break;
 178       indexes=GetAuthenticIndexQueue(image);
 179       for (x=0; x < (ssize_t) image->columns; x++)
 180       {
 181         if (length == 0)
 182           {
 183             length=(size_t) ReadBlobByte(image);
 184             if (bits_per_pixel == 8)
 185               index=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
 186             else
 187               {
 188                 blue=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
 189                 green=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
 190                 red=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
 191               }
 192           }
 193         if (image->storage_class == PseudoClass)
 194           indexes[x]=index;
 195         q->blue=blue;
 196         q->green=green;
 197         q->red=red;
 198         length--;
 199         q++;
 200       }
 201       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 202         break;
 203       if (image->previous == (Image *) NULL)
 204         {
 205           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 206                 image->rows);
 207           if (status == MagickFalse)
 208             break;
 209         }
 210     }
 211     if (image->storage_class == PseudoClass)
 212       (void) SyncImage(image);
 213     if (EOFBlob(image) != MagickFalse)
 214       {
 215         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 216           image->filename);
 217         break;
 218       }
 219     /*
 220       Proceed to next image.
 221     */
 222     if (image_info->number_scenes != 0)
 223       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 224         break;
 225     width=ReadBlobMSBLong(image);
 226     height=ReadBlobMSBLong(image);
 227     (void) ReadBlobMSBShort(image);
 228     (void) ReadBlobMSBShort(image);
 229     bits_per_pixel=ReadBlobMSBShort(image);
 230     status=(width != 0UL) && (height == 0UL) && ((bits_per_pixel == 8) ||
 231       (bits_per_pixel == 24)) ? MagickTrue : MagickFalse;
 232     if (status == MagickTrue)
 233       {
 234         /*
 235           Allocate next image structure.
 236         */
 237         AcquireNextImage(image_info,image);
 238         if (GetNextImageInList(image) == (Image *) NULL)
 239           {
 240             image=DestroyImageList(image);
 241             return((Image *) NULL);
 242           }
 243         image=SyncNextImageInList(image);
 244         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 245           GetBlobSize(image));
 246         if (status == MagickFalse)
 247           break;
 248       }
 249   } while (status == MagickTrue);
 250   (void) CloseBlob(image);
 251   return(GetFirstImageInList(image));
 252 }
 253 \f
 254 /*
 255 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 256 %                                                                             %
 257 %                                                                             %
 258 %                                                                             %
 259 %   R e g i s t e r P I X I m a g e                                           %
 260 %                                                                             %
 261 %                                                                             %
 262 %                                                                             %
 263 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 264 %
 265 %  RegisterPIXImage() adds attributes for the PIX image format to
 266 %  the list of supported formats.  The attributes include the image format
 267 %  tag, a method to read and/or write the format, whether the format
 268 %  supports the saving of more than one frame to the same file or blob,
 269 %  whether the format supports native in-memory I/O, and a brief
 270 %  description of the format.
 271 %
 272 %  The format of the RegisterPIXImage method is:
 273 %
 274 %      size_t RegisterPIXImage(void)
 275 %
 276 */
 277 ModuleExport size_t RegisterPIXImage(void)
 278 {
 279   MagickInfo
 280     *entry;
 281
 282   entry=SetMagickInfo("PIX");
 283   entry->decoder=(DecodeImageHandler *) ReadPIXImage;
 284   entry->description=ConstantString("Alias/Wavefront RLE image format");
 285   entry->module=ConstantString("PIX");
 286   (void) RegisterMagickInfo(entry);
 287   return(MagickImageCoderSignature);
 288 }
 289 \f
 290 /*
 291 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 292 %                                                                             %
 293 %                                                                             %
 294 %                                                                             %
 295 %   U n r e g i s t e r P I X I m a g e                                       %
 296 %                                                                             %
 297 %                                                                             %
 298 %                                                                             %
 299 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 300 %
 301 %  UnregisterPIXImage() removes format registrations made by the
 302 %  PIX module from the list of supported formats.
 303 %
 304 %  The format of the UnregisterPIXImage method is:
 305 %
 306 %      UnregisterPIXImage(void)
 307 %
 308 */
 309 ModuleExport void UnregisterPIXImage(void)
 310 {
 311   (void) UnregisterMagickInfo("PIX");
 312 }