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 1999-2011 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/blob.h"
  44 #include "MagickCore/blob-private.h"
  45 #include "MagickCore/cache.h"
  46 #include "MagickCore/colormap.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 P I X I m a g e                                                   %
  68 %                                                                             %
  69 %                                                                             %
  70 %                                                                             %
  71 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  72 %
  73 %  ReadPIXImage() reads a Alias/Wavefront RLE image file and returns it.
  74 %  It allocates the memory necessary for the new Image structure and returns a
  75 %  pointer to the new image.
  76 %
  77 %  The format of the ReadPIXImage method is:
  78 %
  79 %      Image *ReadPIXImage(const ImageInfo *image_info,ExceptionInfo *exception)
  80 %
  81 %  A description of each parameter follows:
  82 %
  83 %    o image_info: the image info.
  84 %
  85 %    o exception: return any errors or warnings in this structure.
  86 %
  87 %
  88 */
  89 static Image *ReadPIXImage(const ImageInfo *image_info,ExceptionInfo *exception)
  90 {
  91   Image
  92     *image;
  93
  94   MagickBooleanType
  95     status;
  96
  97   Quantum
  98     blue,
  99     green,
 100     index,
 101     red;
 102
 103   register ssize_t
 104     x;
 105
 106   register Quantum
 107     *q;
 108
 109   size_t
 110     bits_per_pixel,
 111     height,
 112     length,
 113     width;
 114
 115   ssize_t
 116     y;
 117
 118   /*
 119     Open image file.
 120   */
 121   assert(image_info != (const ImageInfo *) NULL);
 122   assert(image_info->signature == MagickSignature);
 123   if (image_info->debug != MagickFalse)
 124     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 125       image_info->filename);
 126   assert(exception != (ExceptionInfo *) NULL);
 127   assert(exception->signature == MagickSignature);
 128   image=AcquireImage(image_info,exception);
 129   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 130   if (status == MagickFalse)
 131     {
 132       image=DestroyImageList(image);
 133       return((Image *) NULL);
 134     }
 135   /*
 136     Read PIX image.
 137   */
 138   width=ReadBlobMSBShort(image);
 139   height=ReadBlobMSBShort(image);
 140   (void) ReadBlobMSBShort(image);  /* x-offset */
 141   (void) ReadBlobMSBShort(image);  /* y-offset */
 142   bits_per_pixel=ReadBlobMSBShort(image);
 143   if ((width == 0UL) || (height == 0UL) || ((bits_per_pixel != 8) &&
 144       (bits_per_pixel != 24)))
 145     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 146   do
 147   {
 148     /*
 149       Initialize image structure.
 150     */
 151     image->columns=width;
 152     image->rows=height;
 153     if (bits_per_pixel == 8)
 154       if (AcquireImageColormap(image,256,exception) == MagickFalse)
 155         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 156     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 157       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 158         break;
 159     /*
 160       Convert PIX raster image to pixel packets.
 161     */
 162     red=(Quantum) 0;
 163     green=(Quantum) 0;
 164     blue=(Quantum) 0;
 165     index=0;
 166     length=0;
 167     for (y=0; y < (ssize_t) image->rows; y++)
 168     {
 169       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 170       if (q == (Quantum *) NULL)
 171         break;
 172       for (x=0; x < (ssize_t) image->columns; x++)
 173       {
 174         if (length == 0)
 175           {
 176             length=(size_t) ReadBlobByte(image);
 177             if (bits_per_pixel == 8)
 178               index=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
 179             else
 180               {
 181                 blue=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
 182                 green=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
 183                 red=ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
 184               }
 185           }
 186         if (image->storage_class == PseudoClass)
 187           SetPixelIndex(image,index,q);
 188         SetPixelBlue(image,blue,q);
 189         SetPixelGreen(image,green,q);
 190         SetPixelRed(image,red,q);
 191         length--;
 192         q+=GetPixelChannels(image);
 193       }
 194       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 195         break;
 196       if (image->previous == (Image *) NULL)
 197         {
 198           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 199             image->rows);
 200           if (status == MagickFalse)
 201             break;
 202         }
 203     }
 204     if (image->storage_class == PseudoClass)
 205       (void) SyncImage(image);
 206     if (EOFBlob(image) != MagickFalse)
 207       {
 208         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 209           image->filename);
 210         break;
 211       }
 212     /*
 213       Proceed to next image.
 214     */
 215     if (image_info->number_scenes != 0)
 216       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 217         break;
 218     width=ReadBlobMSBLong(image);
 219     height=ReadBlobMSBLong(image);
 220     (void) ReadBlobMSBShort(image);
 221     (void) ReadBlobMSBShort(image);
 222     bits_per_pixel=ReadBlobMSBShort(image);
 223     status=(width != 0UL) && (height == 0UL) && ((bits_per_pixel == 8) ||
 224       (bits_per_pixel == 24)) ? MagickTrue : MagickFalse;
 225     if (status == MagickTrue)
 226       {
 227         /*
 228           Allocate next image structure.
 229         */
 230         AcquireNextImage(image_info,image,exception);
 231         if (GetNextImageInList(image) == (Image *) NULL)
 232           {
 233             image=DestroyImageList(image);
 234             return((Image *) NULL);
 235           }
 236         image=SyncNextImageInList(image);
 237         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 238           GetBlobSize(image));
 239         if (status == MagickFalse)
 240           break;
 241       }
 242   } while (status == MagickTrue);
 243   (void) CloseBlob(image);
 244   return(GetFirstImageInList(image));
 245 }
 246 \f
 247 /*
 248 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 249 %                                                                             %
 250 %                                                                             %
 251 %                                                                             %
 252 %   R e g i s t e r P I X I m a g e                                           %
 253 %                                                                             %
 254 %                                                                             %
 255 %                                                                             %
 256 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 257 %
 258 %  RegisterPIXImage() adds attributes for the PIX image format to
 259 %  the list of supported formats.  The attributes include the image format
 260 %  tag, a method to read and/or write the format, whether the format
 261 %  supports the saving of more than one frame to the same file or blob,
 262 %  whether the format supports native in-memory I/O, and a brief
 263 %  description of the format.
 264 %
 265 %  The format of the RegisterPIXImage method is:
 266 %
 267 %      size_t RegisterPIXImage(void)
 268 %
 269 */
 270 ModuleExport size_t RegisterPIXImage(void)
 271 {
 272   MagickInfo
 273     *entry;
 274
 275   entry=SetMagickInfo("PIX");
 276   entry->decoder=(DecodeImageHandler *) ReadPIXImage;
 277   entry->description=ConstantString("Alias/Wavefront RLE image format");
 278   entry->module=ConstantString("PIX");
 279   (void) RegisterMagickInfo(entry);
 280   return(MagickImageCoderSignature);
 281 }
 282 \f
 283 /*
 284 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 285 %                                                                             %
 286 %                                                                             %
 287 %                                                                             %
 288 %   U n r e g i s t e r P I X I m a g e                                       %
 289 %                                                                             %
 290 %                                                                             %
 291 %                                                                             %
 292 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 293 %
 294 %  UnregisterPIXImage() removes format registrations made by the
 295 %  PIX module from the list of supported formats.
 296 %
 297 %  The format of the UnregisterPIXImage method is:
 298 %
 299 %      UnregisterPIXImage(void)
 300 %
 301 */
 302 ModuleExport void UnregisterPIXImage(void)
 303 {
 304   (void) UnregisterMagickInfo("PIX");
 305 }