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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            M   M  TTTTT  V   V                              %
   7 %                            MM MM    T    V   V                              %
   8 %                            M M M    T    V   V                              %
   9 %                            M   M    T     V V                               %
  10 %                            M   M    T      V                                %
  11 %                                                                             %
  12 %                                                                             %
  13 %                   Read/Write MTV Raytracer 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/colorspace.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   Forward declarations.
  63 */
  64 static MagickBooleanType
  65   WriteMTVImage(const ImageInfo *,Image *);
  66 \f
  67 /*
  68 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  69 %                                                                             %
  70 %                                                                             %
  71 %                                                                             %
  72 %   R e a d M T V I m a g e                                                   %
  73 %                                                                             %
  74 %                                                                             %
  75 %                                                                             %
  76 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  77 %
  78 %  ReadMTVImage() reads a MTV image file and returns it.  It allocates
  79 %  the memory necessary for the new Image structure and returns a pointer to
  80 %  the new image.
  81 %
  82 %  The format of the ReadMTVImage method is:
  83 %
  84 %      Image *ReadMTVImage(const ImageInfo *image_info,ExceptionInfo *exception)
  85 %
  86 %  A description of each parameter follows:
  87 %
  88 %    o image_info: the image info.
  89 %
  90 %    o exception: return any errors or warnings in this structure.
  91 %
  92 */
  93 static Image *ReadMTVImage(const ImageInfo *image_info,ExceptionInfo *exception)
  94 {
  95   char
  96     buffer[MaxTextExtent];
  97
  98   Image
  99     *image;
 100
 101   long
 102     y;
 103
 104   MagickBooleanType
 105     status;
 106
 107   register long
 108     x;
 109
 110   register PixelPacket
 111     *q;
 112
 113   register unsigned char
 114     *p;
 115
 116   ssize_t
 117     count;
 118
 119   unsigned char
 120     *pixels;
 121
 122   unsigned long
 123     columns,
 124     rows;
 125
 126   /*
 127     Open image file.
 128   */
 129   assert(image_info != (const ImageInfo *) NULL);
 130   assert(image_info->signature == MagickSignature);
 131   if (image_info->debug != MagickFalse)
 132     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 133       image_info->filename);
 134   assert(exception != (ExceptionInfo *) NULL);
 135   assert(exception->signature == MagickSignature);
 136   image=AcquireImage(image_info);
 137   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 138   if (status == MagickFalse)
 139     {
 140       image=DestroyImageList(image);
 141       return((Image *) NULL);
 142     }
 143   /*
 144     Read MTV image.
 145   */
 146   (void) ReadBlobString(image,buffer);
 147   count=(ssize_t) sscanf(buffer,"%lu %lu\n",&columns,&rows);
 148   if (count <= 0)
 149     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 150   do
 151   {
 152     /*
 153       Initialize image structure.
 154     */
 155     image->columns=columns;
 156     image->rows=rows;
 157     image->depth=8;
 158     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 159       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 160         break;
 161     /*
 162       Convert MTV raster image to pixel packets.
 163     */
 164     pixels=(unsigned char *) AcquireQuantumMemory((size_t) image->columns,
 165       3UL*sizeof(*pixels));
 166     if (pixels == (unsigned char *) NULL)
 167       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 168     for (y=0; y < (long) image->rows; y++)
 169     {
 170       count=(ssize_t) ReadBlob(image,(size_t) (3*image->columns),pixels);
 171       if (count != (ssize_t) (3*image->columns))
 172         ThrowReaderException(CorruptImageError,"UnableToReadImageData");
 173       p=pixels;
 174       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 175       if (q == (PixelPacket *) NULL)
 176         break;
 177       for (x=0; x < (long) image->columns; x++)
 178       {
 179         q->red=ScaleCharToQuantum(*p++);
 180         q->green=ScaleCharToQuantum(*p++);
 181         q->blue=ScaleCharToQuantum(*p++);
 182         SetOpacityPixelComponent(q,OpaqueOpacity);
 183         q++;
 184       }
 185       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 186         break;
 187       if (image->previous == (Image *) NULL)
 188         {
 189           status=SetImageProgress(image,LoadImageTag,y,image->rows);
 190           if (status == MagickFalse)
 191             break;
 192         }
 193     }
 194     pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 195     if (EOFBlob(image) != MagickFalse)
 196       {
 197         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 198           image->filename);
 199         break;
 200       }
 201     /*
 202       Proceed to next image.
 203     */
 204     if (image_info->number_scenes != 0)
 205       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 206         break;
 207     *buffer='\0';
 208     (void) ReadBlobString(image,buffer);
 209     count=(ssize_t) sscanf(buffer,"%lu %lu\n",&columns,&rows);
 210     if (count > 0)
 211       {
 212         /*
 213           Allocate next image structure.
 214         */
 215         AcquireNextImage(image_info,image);
 216         if (GetNextImageInList(image) == (Image *) NULL)
 217           {
 218             image=DestroyImageList(image);
 219             return((Image *) NULL);
 220           }
 221         image=SyncNextImageInList(image);
 222         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 223           GetBlobSize(image));
 224         if (status == MagickFalse)
 225           break;
 226       }
 227   } while (count > 0);
 228   (void) CloseBlob(image);
 229   return(GetFirstImageInList(image));
 230 }
 231 \f
 232 /*
 233 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 234 %                                                                             %
 235 %                                                                             %
 236 %                                                                             %
 237 %   R e g i s t e r M T V I m a g e                                           %
 238 %                                                                             %
 239 %                                                                             %
 240 %                                                                             %
 241 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 242 %
 243 %  RegisterMTVImage() adds attributes for the MTV image format to
 244 %  the list of supported formats.  The attributes include the image format
 245 %  tag, a method to read and/or write the format, whether the format
 246 %  supports the saving of more than one frame to the same file or blob,
 247 %  whether the format supports native in-memory I/O, and a brief
 248 %  description of the format.
 249 %
 250 %  The format of the RegisterMTVImage method is:
 251 %
 252 %      unsigned long RegisterMTVImage(void)
 253 %
 254 */
 255 ModuleExport unsigned long RegisterMTVImage(void)
 256 {
 257   MagickInfo
 258     *entry;
 259
 260   entry=SetMagickInfo("MTV");
 261   entry->decoder=(DecodeImageHandler *) ReadMTVImage;
 262   entry->encoder=(EncodeImageHandler *) WriteMTVImage;
 263   entry->description=ConstantString("MTV Raytracing image format");
 264   entry->module=ConstantString("MTV");
 265   (void) RegisterMagickInfo(entry);
 266   return(MagickImageCoderSignature);
 267 }
 268 \f
 269 /*
 270 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 271 %                                                                             %
 272 %                                                                             %
 273 %                                                                             %
 274 %   U n r e g i s t e r M T V I m a g e                                       %
 275 %                                                                             %
 276 %                                                                             %
 277 %                                                                             %
 278 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 279 %
 280 %  UnregisterMTVImage() removes format registrations made by the
 281 %  MTV module from the list of supported formats.
 282 %
 283 %  The format of the UnregisterMTVImage method is:
 284 %
 285 %      UnregisterMTVImage(void)
 286 %
 287 */
 288 ModuleExport void UnregisterMTVImage(void)
 289 {
 290   (void) UnregisterMagickInfo("MTV");
 291 }
 292 \f
 293 /*
 294 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 295 %                                                                             %
 296 %                                                                             %
 297 %                                                                             %
 298 %   W r i t e M T V I m a g e                                                 %
 299 %                                                                             %
 300 %                                                                             %
 301 %                                                                             %
 302 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 303 %
 304 %  WriteMTVImage() writes an image to a file in red, green, and blue
 305 %  MTV rasterfile format.
 306 %
 307 %  The format of the WriteMTVImage method is:
 308 %
 309 %      MagickBooleanType WriteMTVImage(const ImageInfo *image_info,Image *image)
 310 %
 311 %  A description of each parameter follows.
 312 %
 313 %    o image_info: the image info.
 314 %
 315 %    o image:  The image.
 316 %
 317 */
 318 static MagickBooleanType WriteMTVImage(const ImageInfo *image_info,Image *image)
 319 {
 320   char
 321     buffer[MaxTextExtent];
 322
 323   long
 324     y;
 325
 326   MagickBooleanType
 327     status;
 328
 329   MagickOffsetType
 330     scene;
 331
 332   register const PixelPacket
 333     *p;
 334
 335   register long
 336     x;
 337
 338   register unsigned char
 339     *q;
 340
 341   unsigned char
 342     *pixels;
 343
 344   /*
 345     Open output image file.
 346   */
 347   assert(image_info != (const ImageInfo *) NULL);
 348   assert(image_info->signature == MagickSignature);
 349   assert(image != (Image *) NULL);
 350   assert(image->signature == MagickSignature);
 351   if (image->debug != MagickFalse)
 352     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 353   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 354   if (status == MagickFalse)
 355     return(status);
 356   scene=0;
 357   do
 358   {
 359     /*
 360       Allocate memory for pixels.
 361     */
 362     if (image->colorspace != RGBColorspace)
 363       (void) TransformImageColorspace(image,RGBColorspace);
 364     pixels=(unsigned char *) AcquireQuantumMemory((size_t) image->columns,
 365       3UL*sizeof(*pixels));
 366     if (pixels == (unsigned char *) NULL)
 367       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 368     /*
 369       Initialize raster file header.
 370     */
 371     (void) FormatMagickString(buffer,MaxTextExtent,"%lu %lu\n",
 372       image->columns,image->rows);
 373     (void) WriteBlobString(image,buffer);
 374     for (y=0; y < (long) image->rows; y++)
 375     {
 376       p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 377       if (p == (const PixelPacket *) NULL)
 378         break;
 379       q=pixels;
 380       for (x=0; x < (long) image->columns; x++)
 381       {
 382         *q++=ScaleQuantumToChar(GetRedPixelComponent(p));
 383         *q++=ScaleQuantumToChar(GetGreenPixelComponent(p));
 384         *q++=ScaleQuantumToChar(GetBluePixelComponent(p));
 385         p++;
 386       }
 387       (void) WriteBlob(image,(size_t) (q-pixels),pixels);
 388       if (image->previous == (Image *) NULL)
 389         {
 390           status=SetImageProgress(image,SaveImageTag,y,image->rows);
 391           if (status == MagickFalse)
 392             break;
 393         }
 394     }
 395     pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 396     if (GetNextImageInList(image) == (Image *) NULL)
 397       break;
 398     image=SyncNextImageInList(image);
 399     status=SetImageProgress(image,SaveImagesTag,scene,
 400       GetImageListLength(image));
 401     if (status == MagickFalse)
 402       break;
 403     scene++;
 404   } while (image_info->adjoin != MagickFalse);
 405   (void) CloseBlob(image);
 406   return(MagickTrue);
 407 }