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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                         GGGG  RRRR    AAA   Y   Y                           %
   7 %                        G      R   R  A   A   Y Y                            %
   8 %                        G  GG  RRRR   AAAAA    Y                             %
   9 %                        G   G  R R    A   A    Y                             %
  10 %                         GGG   R  R   A   A    Y                             %
  11 %                                                                             %
  12 %                                                                             %
  13 %                    Read/Write RAW Gray 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/constitute.h"
  48 #include "magick/exception.h"
  49 #include "magick/exception-private.h"
  50 #include "magick/image.h"
  51 #include "magick/image-private.h"
  52 #include "magick/list.h"
  53 #include "magick/magick.h"
  54 #include "magick/memory_.h"
  55 #include "magick/monitor.h"
  56 #include "magick/monitor-private.h"
  57 #include "magick/pixel.h"
  58 #include "magick/pixel-private.h"
  59 #include "magick/quantum-private.h"
  60 #include "magick/static.h"
  61 #include "magick/statistic.h"
  62 #include "magick/string_.h"
  63 #include "magick/module.h"
  64 \f
  65 /*
  66   Forward declarations.
  67 */
  68 static MagickBooleanType
  69   WriteGRAYImage(const ImageInfo *,Image *);
  70 \f
  71 /*
  72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  73 %                                                                             %
  74 %                                                                             %
  75 %                                                                             %
  76 %   R e a d G R A Y I m a g e                                                 %
  77 %                                                                             %
  78 %                                                                             %
  79 %                                                                             %
  80 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  81 %
  82 %  ReadGRAYImage() reads an image of raw grayscale samples and returns
  83 %  it.  It allocates the memory necessary for the new Image structure and
  84 %  returns a pointer to the new image.
  85 %
  86 %  The format of the ReadGRAYImage method is:
  87 %
  88 %      Image *ReadGRAYImage(const ImageInfo *image_info,
  89 %        ExceptionInfo *exception)
  90 %
  91 %  A description of each parameter follows:
  92 %
  93 %    o image_info: the image info.
  94 %
  95 %    o exception: return any errors or warnings in this structure.
  96 %
  97 */
  98 static Image *ReadGRAYImage(const ImageInfo *image_info,
  99   ExceptionInfo *exception)
 100 {
 101   Image
 102     *canvas_image,
 103     *image;
 104
 105   ssize_t
 106     y;
 107
 108   MagickBooleanType
 109     status;
 110
 111   MagickOffsetType
 112     scene;
 113
 114   QuantumInfo
 115     *quantum_info;
 116
 117   QuantumType
 118     quantum_type;
 119
 120   size_t
 121     length;
 122
 123   ssize_t
 124     count;
 125
 126   unsigned char
 127     *pixels;
 128
 129   /*
 130     Open image file.
 131   */
 132   assert(image_info != (const ImageInfo *) NULL);
 133   assert(image_info->signature == MagickSignature);
 134   if (image_info->debug != MagickFalse)
 135     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 136       image_info->filename);
 137   assert(exception != (ExceptionInfo *) NULL);
 138   assert(exception->signature == MagickSignature);
 139   image=AcquireImage(image_info);
 140   if ((image->columns == 0) || (image->rows == 0))
 141     ThrowReaderException(OptionError,"MustSpecifyImageSize");
 142   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 143   if (status == MagickFalse)
 144     {
 145       image=DestroyImageList(image);
 146       return((Image *) NULL);
 147     }
 148   if (DiscardBlobBytes(image,(size_t) image->offset) == MagickFalse)
 149     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 150       image->filename);
 151   /*
 152     Create virtual canvas to support cropping (i.e. image.gray[100x100+10+20]).
 153   */
 154   canvas_image=CloneImage(image,image->extract_info.width,1,MagickFalse,
 155     exception);
 156   (void) SetImageVirtualPixelMethod(canvas_image,BlackVirtualPixelMethod);
 157   quantum_type=GrayQuantum;
 158   quantum_info=AcquireQuantumInfo(image_info,canvas_image);
 159   if (quantum_info == (QuantumInfo *) NULL)
 160     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 161   pixels=GetQuantumPixels(quantum_info);
 162   if (image_info->number_scenes != 0)
 163     while (image->scene < image_info->scene)
 164     {
 165       /*
 166         Skip to next image.
 167       */
 168       image->scene++;
 169       length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
 170       for (y=0; y < (ssize_t) image->rows; y++)
 171       {
 172         count=ReadBlob(image,length,pixels);
 173         if (count != (ssize_t) length)
 174           break;
 175       }
 176     }
 177   scene=0;
 178   count=0;
 179   length=0;
 180   do
 181   {
 182     /*
 183       Read pixels to virtual canvas image then push to image.
 184     */
 185     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 186       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 187         break;
 188     if (scene == 0)
 189       {
 190         length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
 191         count=ReadBlob(image,length,pixels);
 192       }
 193     for (y=0; y < (ssize_t) image->extract_info.height; y++)
 194     {
 195       register const PixelPacket
 196         *restrict p;
 197
 198       register ssize_t
 199         x;
 200
 201       register PixelPacket
 202         *restrict q;
 203
 204       if (count != (ssize_t) length)
 205         {
 206           ThrowFileException(exception,CorruptImageError,
 207             "UnexpectedEndOfFile",image->filename);
 208           break;
 209         }
 210       q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,exception);
 211       if (q == (PixelPacket *) NULL)
 212         break;
 213       length=ImportQuantumPixels(canvas_image,(CacheView *) NULL,quantum_info,
 214         quantum_type,pixels,exception);
 215       if (SyncAuthenticPixels(canvas_image,exception) == MagickFalse)
 216         break;
 217       if (((y-image->extract_info.y) >= 0) &&
 218           ((y-image->extract_info.y) < (ssize_t) image->rows))
 219         {
 220           p=GetVirtualPixels(canvas_image,canvas_image->extract_info.x,0,
 221             image->columns,1,exception);
 222           q=QueueAuthenticPixels(image,0,y-image->extract_info.y,image->columns,
 223             1,exception);
 224           if ((p == (const PixelPacket *) NULL) || (q == (PixelPacket *) NULL))
 225             break;
 226           for (x=0; x < (ssize_t) image->columns; x++)
 227           {
 228             SetRedPixelComponent(q,GetRedPixelComponent(p));
 229             SetGreenPixelComponent(q,GetGreenPixelComponent(p));
 230             SetBluePixelComponent(q,GetBluePixelComponent(p));
 231             p++;
 232             q++;
 233           }
 234           if (SyncAuthenticPixels(image,exception) == MagickFalse)
 235             break;
 236         }
 237       if (image->previous == (Image *) NULL)
 238         {
 239           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 240             image->rows);
 241           if (status == MagickFalse)
 242             break;
 243         }
 244       count=ReadBlob(image,length,pixels);
 245     }
 246     SetQuantumImageType(image,quantum_type);
 247     /*
 248       Proceed to next image.
 249     */
 250     if (image_info->number_scenes != 0)
 251       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 252         break;
 253     if (count == (ssize_t) length)
 254       {
 255         /*
 256           Allocate next image structure.
 257         */
 258         AcquireNextImage(image_info,image);
 259         if (GetNextImageInList(image) == (Image *) NULL)
 260           {
 261             image=DestroyImageList(image);
 262             return((Image *) NULL);
 263           }
 264         image=SyncNextImageInList(image);
 265         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 266           GetBlobSize(image));
 267         if (status == MagickFalse)
 268           break;
 269       }
 270     scene++;
 271   } while (count == (ssize_t) length);
 272   quantum_info=DestroyQuantumInfo(quantum_info);
 273   InheritException(&image->exception,&canvas_image->exception);
 274   canvas_image=DestroyImage(canvas_image);
 275   (void) CloseBlob(image);
 276   return(GetFirstImageInList(image));
 277 }
 278 \f
 279 /*
 280 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 281 %                                                                             %
 282 %                                                                             %
 283 %                                                                             %
 284 %   R e g i s t e r G R A Y I m a g e                                         %
 285 %                                                                             %
 286 %                                                                             %
 287 %                                                                             %
 288 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 289 %
 290 %  RegisterGRAYImage() adds attributes for the GRAY image format to
 291 %  the list of supported formats.  The attributes include the image format
 292 %  tag, a method to read and/or write the format, whether the format
 293 %  supports the saving of more than one frame to the same file or blob,
 294 %  whether the format supports native in-memory I/O, and a brief
 295 %  description of the format.
 296 %
 297 %  The format of the RegisterGRAYImage method is:
 298 %
 299 %      size_t RegisterGRAYImage(void)
 300 %
 301 */
 302 ModuleExport size_t RegisterGRAYImage(void)
 303 {
 304   MagickInfo
 305     *entry;
 306
 307   entry=SetMagickInfo("GRAY");
 308   entry->decoder=(DecodeImageHandler *) ReadGRAYImage;
 309   entry->encoder=(EncodeImageHandler *) WriteGRAYImage;
 310   entry->raw=MagickTrue;
 311   entry->endian_support=MagickTrue;
 312   entry->description=ConstantString("Raw gray samples");
 313   entry->module=ConstantString("GRAY");
 314   (void) RegisterMagickInfo(entry);
 315   return(MagickImageCoderSignature);
 316 }
 317 \f
 318 /*
 319 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 320 %                                                                             %
 321 %                                                                             %
 322 %                                                                             %
 323 %   U n r e g i s t e r G R A Y I m a g e                                     %
 324 %                                                                             %
 325 %                                                                             %
 326 %                                                                             %
 327 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 328 %
 329 %  UnregisterGRAYImage() removes format registrations made by the
 330 %  GRAY module from the list of supported formats.
 331 %
 332 %  The format of the UnregisterGRAYImage method is:
 333 %
 334 %      UnregisterGRAYImage(void)
 335 %
 336 */
 337 ModuleExport void UnregisterGRAYImage(void)
 338 {
 339   (void) UnregisterMagickInfo("GRAY");
 340 }
 341 \f
 342 /*
 343 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 344 %                                                                             %
 345 %                                                                             %
 346 %                                                                             %
 347 %   W r i t e G R A Y I m a g e                                               %
 348 %                                                                             %
 349 %                                                                             %
 350 %                                                                             %
 351 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 352 %
 353 %  WriteGRAYImage() writes an image to a file as gray scale intensity
 354 %  values.
 355 %
 356 %  The format of the WriteGRAYImage method is:
 357 %
 358 %      MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
 359 %        Image *image)
 360 %
 361 %  A description of each parameter follows.
 362 %
 363 %    o image_info: the image info.
 364 %
 365 %    o image:  The image.
 366 %
 367 */
 368 static MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
 369   Image *image)
 370 {
 371   ssize_t
 372     y;
 373
 374   MagickBooleanType
 375     status;
 376
 377   MagickOffsetType
 378     scene;
 379
 380   QuantumInfo
 381     *quantum_info;
 382
 383   QuantumType
 384     quantum_type;
 385
 386   ssize_t
 387     count;
 388
 389   size_t
 390     length;
 391
 392   unsigned char
 393     *pixels;
 394
 395   /*
 396     Open output image file.
 397   */
 398   assert(image_info != (const ImageInfo *) NULL);
 399   assert(image_info->signature == MagickSignature);
 400   assert(image != (Image *) NULL);
 401   assert(image->signature == MagickSignature);
 402   if (image->debug != MagickFalse)
 403     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 404   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 405   if (status == MagickFalse)
 406     return(status);
 407   scene=0;
 408   do
 409   {
 410     /*
 411       Write grayscale pixels.
 412     */
 413     if (image->colorspace != RGBColorspace)
 414       (void) TransformImageColorspace(image,RGBColorspace);
 415     quantum_type=GrayQuantum;
 416     quantum_info=AcquireQuantumInfo(image_info,image);
 417     if (quantum_info == (QuantumInfo *) NULL)
 418       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 419     pixels=GetQuantumPixels(quantum_info);
 420     for (y=0; y < (ssize_t) image->rows; y++)
 421     {
 422       register const PixelPacket
 423         *restrict p;
 424
 425       p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 426       if (p == (const PixelPacket *) NULL)
 427         break;
 428       length=ExportQuantumPixels(image,(const CacheView *) NULL,quantum_info,
 429         quantum_type,pixels,&image->exception);
 430       count=WriteBlob(image,length,pixels);
 431       if (count != (ssize_t) length)
 432         break;
 433       if (image->previous == (Image *) NULL)
 434         {
 435           status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 436             image->rows);
 437           if (status == MagickFalse)
 438             break;
 439         }
 440     }
 441     quantum_info=DestroyQuantumInfo(quantum_info);
 442     if (GetNextImageInList(image) == (Image *) NULL)
 443       break;
 444     image=SyncNextImageInList(image);
 445     status=SetImageProgress(image,SaveImagesTag,scene++,
 446       GetImageListLength(image));
 447     if (status == MagickFalse)
 448       break;
 449   } while (image_info->adjoin != MagickFalse);
 450   (void) CloseBlob(image);
 451   return(MagickTrue);
 452 }