granicus.if.org Git - imagemagick/blob - www/source/mgk.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            M   M   GGGG  K   K                              %
   7 %                            MM MM  G      K  K                               %
   8 %                            M M M  G  GG  KKK                                %
   9 %                            M   M  G   G  K  K                               %
  10 %                            M   M   GGG   K   K                              %
  11 %                                                                             %
  12 %                                                                             %
  13 %                        Read/Write MGK 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 "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   WriteMGKImage(const ImageInfo *,Image *);
  66 \f
  67 /*
  68 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  69 %                                                                             %
  70 %                                                                             %
  71 %                                                                             %
  72 %   I s M G K                                                                 %
  73 %                                                                             %
  74 %                                                                             %
  75 %                                                                             %
  76 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  77 %
  78 %  IsMGK() returns MagickTrue if the image format type, identified by the
  79 %  magick string, is MGK.
  80 %
  81 %  The format of the IsMGK method is:
  82 %
  83 %      MagickBooleanType IsMGK(const unsigned char *magick,const size_t length)
  84 %
  85 %  A description of each parameter follows:
  86 %
  87 %    o magick: This string is generally the first few bytes of an image file
  88 %      or blob.
  89 %
  90 %    o length: Specifies the length of the magick string.
  91 %
  92 */
  93 static MagickBooleanType IsMGK(const unsigned char *magick,const size_t length)
  94 {
  95   if (length < 7)
  96     return(MagickFalse);
  97   if (LocaleNCompare((char *) magick,"id=mgk",7) == 0)
  98     return(MagickTrue);
  99   return(MagickFalse);
 100 }
 101 \f
 102 /*
 103 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 104 %                                                                             %
 105 %                                                                             %
 106 %                                                                             %
 107 %   R e a d M G K I m a g e                                                   %
 108 %                                                                             %
 109 %                                                                             %
 110 %                                                                             %
 111 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 112 %
 113 %  ReadMGKImage() reads a MGK image file and returns it.  It allocates
 114 %  the memory necessary for the new Image structure and returns a pointer to
 115 %  the new image.
 116 %
 117 %  The format of the ReadMGKImage method is:
 118 %
 119 %      Image *ReadMGKImage(const ImageInfo *image_info,
 120 %        ExceptionInfo *exception)
 121 %
 122 %  A description of each parameter follows:
 123 %
 124 %    o image_info: the image info.
 125 %
 126 %    o exception: return any errors or warnings in this structure.
 127 %
 128 */
 129 static Image *ReadMGKImage(const ImageInfo *image_info,
 130   ExceptionInfo *exception)
 131 {
 132   char
 133     buffer[MaxTextExtent];
 134
 135   Image
 136     *image;
 137
 138   MagickBooleanType
 139     status;
 140
 141   register ssize_t
 142     x;
 143
 144   register PixelPacket
 145     *q;
 146
 147   register unsigned char
 148     *p;
 149
 150   ssize_t
 151     count,
 152     y;
 153
 154   size_t
 155     columns,
 156     rows;
 157
 158   unsigned char
 159     *pixels;
 160
 161   /*
 162     Open image file.
 163   */
 164   assert(image_info != (const ImageInfo *) NULL);
 165   assert(image_info->signature == MagickSignature);
 166   if (image_info->debug != MagickFalse)
 167     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 168       image_info->filename);
 169   assert(exception != (ExceptionInfo *) NULL);
 170   assert(exception->signature == MagickSignature);
 171   image=AcquireImage(image_info);
 172   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 173   if (status == MagickFalse)
 174     {
 175       image=DestroyImageList(image);
 176       return((Image *) NULL);
 177     }
 178   /*
 179     Read MGK image.
 180   */
 181   (void) ReadBlobString(image,buffer);  /* read magic number */
 182   if (IsMGK(buffer,7) == MagickFalse)
 183     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 184   (void) ReadBlobString(image,buffer);
 185   count=(ssize_t) sscanf(buffer,"%lu %lu\n",&columns,&rows);
 186   if (count <= 0)
 187     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 188   do
 189   {
 190     /*
 191       Initialize image structure.
 192     */
 193     image->columns=columns;
 194     image->rows=rows;
 195     image->depth=8;
 196     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 197       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 198         break;
 199     /*
 200       Convert MGK raster image to pixel packets.
 201     */
 202     if (SetImageExtent(image,0,0) == MagickFalse)
 203       {
 204         InheritException(exception,&image->exception);
 205         return(DestroyImageList(image));
 206       }
 207     pixels=(unsigned char *) AcquireQuantumMemory((size_t) image->columns,
 208       3UL*sizeof(*pixels));
 209     if (pixels == (unsigned char *) NULL)
 210       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 211     for (y=0; y < (ssize_t) image->rows; y++)
 212     {
 213       count=(ssize_t) ReadBlob(image,(size_t) (3*image->columns),pixels);
 214       if (count != (ssize_t) (3*image->columns))
 215         ThrowReaderException(CorruptImageError,"UnableToReadImageData");
 216       p=pixels;
 217       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 218       if (q == (PixelPacket *) NULL)
 219         break;
 220       for (x=0; x < (ssize_t) image->columns; x++)
 221       {
 222         SetPixelRed(q,ScaleCharToQuantum(*p++));
 223         SetPixelGreen(q,ScaleCharToQuantum(*p++));
 224         SetPixelBlue(q,ScaleCharToQuantum(*p++));
 225         q++;
 226       }
 227       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 228         break;
 229       if ((image->previous == (Image *) NULL) &&
 230           (SetImageProgress(image,LoadImageTag,y,image->rows) == MagickFalse))
 231         break;
 232     }
 233     pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 234     if (EOFBlob(image) != MagickFalse)
 235       {
 236         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 237           image->filename);
 238         break;
 239       }
 240     /*
 241       Proceed to next image.
 242     */
 243     if (image_info->number_scenes != 0)
 244       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 245         break;
 246     *buffer='\0';
 247     (void) ReadBlobString(image,buffer);
 248     count=(ssize_t) sscanf(buffer,"%lu %lu\n",&columns,&rows);
 249     if (count > 0)
 250       {
 251         /*
 252           Allocate next image structure.
 253         */
 254         AcquireNextImage(image_info,image);
 255         if (GetNextImageInList(image) == (Image *) NULL)
 256           {
 257             image=DestroyImageList(image);
 258             return((Image *) NULL);
 259           }
 260         image=SyncNextImageInList(image);
 261         if (image->progress_monitor != (MagickProgressMonitor) NULL)
 262           {
 263             status=SetImageProgress(image,LoadImageTag,TellBlob(image),
 264               GetBlobSize(image));
 265             if (status == MagickFalse)
 266               break;
 267           }
 268       }
 269   } while (count > 0);
 270   (void) CloseBlob(image);
 271   return(GetFirstImageInList(image));
 272 }
 273 \f
 274 /*
 275 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 276 %                                                                             %
 277 %                                                                             %
 278 %                                                                             %
 279 %   R e g i s t e r M G K I m a g e                                           %
 280 %                                                                             %
 281 %                                                                             %
 282 %                                                                             %
 283 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 284 %
 285 %  RegisterMGKImage() adds attributes for the MGK image format to
 286 %  the list of supported formats.  The attributes include the image format
 287 %  tag, a method to read and/or write the format, whether the format
 288 %  supports the saving of more than one frame to the same file or blob,
 289 %  whether the format supports native in-memory I/O, and a brief
 290 %  description of the format.
 291 %
 292 %  The format of the RegisterMGKImage method is:
 293 %
 294 %      size_t RegisterMGKImage(void)
 295 %
 296 */
 297 ModuleExport size_t RegisterMGKImage(void)
 298 {
 299   MagickInfo
 300     *entry;
 301
 302   entry=SetMagickInfo("MGK");
 303   entry->decoder=(DecodeImageHandler *) ReadMGKImage;
 304   entry->encoder=(EncodeImageHandler *) WriteMGKImage;
 305   entry->magick=(IsImageFormatHandler *) IsMGK;
 306   entry->description=ConstantString("MGK");
 307   entry->module=ConstantString("MGK");
 308   (void) RegisterMagickInfo(entry);
 309   return(MagickImageCoderSignature);
 310 }
 311 \f
 312 /*
 313 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 314 %                                                                             %
 315 %                                                                             %
 316 %                                                                             %
 317 %   U n r e g i s t e r M G K I m a g e                                       %
 318 %                                                                             %
 319 %                                                                             %
 320 %                                                                             %
 321 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 322 %
 323 %  UnregisterMGKImage() removes format registrations made by the
 324 %  MGK module from the list of supported formats.
 325 %
 326 %  The format of the UnregisterMGKImage method is:
 327 %
 328 %      UnregisterMGKImage(void)
 329 %
 330 */
 331 ModuleExport void UnregisterMGKImage(void)
 332 {
 333   (void) UnregisterMagickInfo("MGK");
 334 }
 335 \f
 336 /*
 337 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 338 %                                                                             %
 339 %                                                                             %
 340 %                                                                             %
 341 %   W r i t e M G K I m a g e                                                 %
 342 %                                                                             %
 343 %                                                                             %
 344 %                                                                             %
 345 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 346 %
 347 %  WriteMGKImage() writes an image to a file in red, green, and blue
 348 %  MGK rasterfile format.
 349 %
 350 %  The format of the WriteMGKImage method is:
 351 %
 352 %      MagickBooleanType WriteMGKImage(const ImageInfo *image_info,
 353 %        Image *image)
 354 %
 355 %  A description of each parameter follows.
 356 %
 357 %    o image_info: the image info.
 358 %
 359 %    o image:  The image.
 360 %
 361 */
 362 static MagickBooleanType WriteMGKImage(const ImageInfo *image_info,
 363   Image *image)
 364 {
 365   char
 366     buffer[MaxTextExtent];
 367
 368   MagickBooleanType
 369     status;
 370
 371   MagickOffsetType
 372     scene;
 373
 374   register const PixelPacket
 375     *p;
 376
 377   register ssize_t
 378     x;
 379
 380   register unsigned char
 381     *q;
 382
 383   ssize_t
 384     y;
 385
 386   unsigned char
 387     *pixels;
 388
 389   /*
 390     Open output image file.
 391   */
 392   assert(image_info != (const ImageInfo *) NULL);
 393   assert(image_info->signature == MagickSignature);
 394   assert(image != (Image *) NULL);
 395   assert(image->signature == MagickSignature);
 396   if (image->debug != MagickFalse)
 397     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 398   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 399   if (status == MagickFalse)
 400     return(status);
 401   scene=0;
 402   do
 403   {
 404     /*
 405       Allocate memory for pixels.
 406     */
 407     if (image->colorspace != RGBColorspace)
 408       (void) SetImageColorspace(image,RGBColorspace);
 409     pixels=(unsigned char *) AcquireQuantumMemory((size_t) image->columns,
 410       3UL*sizeof(*pixels));
 411     if (pixels == (unsigned char *) NULL)
 412       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 413     /*
 414       Initialize raster file header.
 415     */
 416     (void) WriteBlobString(image,"id=mgk\n");
 417     (void) FormatMagickString(buffer,MaxTextExtent,"%lu %lu\n",image->columns,
 418       image->rows);
 419     (void) WriteBlobString(image,buffer);
 420     for (y=0; y < (ssize_t) image->rows; y++)
 421     {
 422       p=AcquireImagePixels(image,0,y,image->columns,1,&image->exception);
 423       if (p == (const PixelPacket *) NULL)
 424         break;
 425       q=pixels;
 426       for (x=0; x < (ssize_t) image->columns; x++)
 427       {
 428         *q++=ScaleQuantumToChar(GetRedSample(p));
 429         *q++=ScaleQuantumToChar(GetGreenSample(p));
 430         *q++=ScaleQuantumToChar(GetBlueSample(p));
 431         p++;
 432       }
 433       (void) WriteBlob(image,(size_t) (q-pixels),pixels);
 434       if ((image->previous == (Image *) NULL) &&
 435           (SetImageProgress(image,SaveImageTag,y,image->rows) == MagickFalse))
 436         break;
 437     }
 438     pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 439     if (GetNextImageInList(image) == (Image *) NULL)
 440       break;
 441     image=SyncNextImageInList(image);
 442     status=SetImageProgress(image,SaveImagesTag,scene,
 443       GetImageListLength(image));
 444     if (status == MagickFalse)
 445       break;
 446     scene++;
 447   } while (image_info->adjoin != MagickFalse);
 448   (void) CloseBlob(image);
 449   return(MagickTrue);
 450 }