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