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 1999-2010 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/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   long
 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   register long
 121     i;
 122
 123   ssize_t
 124     count;
 125
 126   size_t
 127     length;
 128
 129   unsigned char
 130     *pixels;
 131
 132   /*
 133     Open image file.
 134   */
 135   assert(image_info != (const ImageInfo *) NULL);
 136   assert(image_info->signature == MagickSignature);
 137   if (image_info->debug != MagickFalse)
 138     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 139       image_info->filename);
 140   assert(exception != (ExceptionInfo *) NULL);
 141   assert(exception->signature == MagickSignature);
 142   image=AcquireImage(image_info);
 143   if ((image->columns == 0) || (image->rows == 0))
 144     ThrowReaderException(OptionError,"MustSpecifyImageSize");
 145   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 146   if (status == MagickFalse)
 147     {
 148       image=DestroyImageList(image);
 149       return((Image *) NULL);
 150     }
 151   for (i=0; i < image->offset; i++)
 152     if (ReadBlobByte(image) == EOF)
 153       {
 154         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 155           image->filename);
 156         break;
 157       }
 158   /*
 159     Create virtual canvas to support cropping (i.e. image.gray[100x100+10+20]).
 160   */
 161   canvas_image=CloneImage(image,image->extract_info.width,1,MagickFalse,
 162     exception);
 163   (void) SetImageVirtualPixelMethod(canvas_image,BlackVirtualPixelMethod);
 164   quantum_type=GrayQuantum;
 165   quantum_info=AcquireQuantumInfo(image_info,canvas_image);
 166   if (quantum_info == (QuantumInfo *) NULL)
 167     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 168   pixels=GetQuantumPixels(quantum_info);
 169   if (image_info->number_scenes != 0)
 170     while (image->scene < image_info->scene)
 171     {
 172       /*
 173         Skip to next image.
 174       */
 175       image->scene++;
 176       length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
 177       for (y=0; y < (long) image->rows; y++)
 178       {
 179         count=ReadBlob(image,length,pixels);
 180         if (count != (ssize_t) length)
 181           break;
 182       }
 183     }
 184   scene=0;
 185   count=0;
 186   length=0;
 187   do
 188   {
 189     /*
 190       Read pixels to virtual canvas image then push to image.
 191     */
 192     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 193       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 194         break;
 195     if (scene == 0)
 196       {
 197         length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
 198         count=ReadBlob(image,length,pixels);
 199       }
 200     for (y=0; y < (long) image->extract_info.height; y++)
 201     {
 202       register const PixelPacket
 203         *restrict p;
 204
 205       register long
 206         x;
 207
 208       register PixelPacket
 209         *restrict q;
 210
 211       if (count != (ssize_t) length)
 212         {
 213           ThrowFileException(exception,CorruptImageError,
 214             "UnexpectedEndOfFile",image->filename);
 215           break;
 216         }
 217       q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,exception);
 218       if (q == (PixelPacket *) NULL)
 219         break;
 220       length=ImportQuantumPixels(canvas_image,(CacheView *) NULL,quantum_info,
 221         quantum_type,pixels,exception);
 222       if (SyncAuthenticPixels(canvas_image,exception) == MagickFalse)
 223         break;
 224       if (((y-image->extract_info.y) >= 0) &&
 225           ((y-image->extract_info.y) < (long) image->rows))
 226         {
 227           p=GetVirtualPixels(canvas_image,canvas_image->extract_info.x,0,
 228             image->columns,1,exception);
 229           q=QueueAuthenticPixels(image,0,y-image->extract_info.y,image->columns,
 230             1,exception);
 231           if ((p == (const PixelPacket *) NULL) || (q == (PixelPacket *) NULL))
 232             break;
 233           for (x=0; x < (long) image->columns; x++)
 234           {
 235             SetRedPixelComponent(q,GetRedPixelComponent(p));
 236             SetGreenPixelComponent(q,GetGreenPixelComponent(p));
 237             SetBluePixelComponent(q,GetBluePixelComponent(p));
 238             p++;
 239             q++;
 240           }
 241           if (SyncAuthenticPixels(image,exception) == MagickFalse)
 242             break;
 243         }
 244       if (image->previous == (Image *) NULL)
 245         {
 246           status=SetImageProgress(image,LoadImageTag,y,image->rows);
 247           if (status == MagickFalse)
 248             break;
 249         }
 250       count=ReadBlob(image,length,pixels);
 251     }
 252     SetQuantumImageType(image,quantum_type);
 253     /*
 254       Proceed to next image.
 255     */
 256     if (image_info->number_scenes != 0)
 257       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 258         break;
 259     if (count == (ssize_t) length)
 260       {
 261         /*
 262           Allocate next image structure.
 263         */
 264         AcquireNextImage(image_info,image);
 265         if (GetNextImageInList(image) == (Image *) NULL)
 266           {
 267             image=DestroyImageList(image);
 268             return((Image *) NULL);
 269           }
 270         image=SyncNextImageInList(image);
 271         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 272           GetBlobSize(image));
 273         if (status == MagickFalse)
 274           break;
 275       }
 276     scene++;
 277   } while (count == (ssize_t) length);
 278   quantum_info=DestroyQuantumInfo(quantum_info);
 279   InheritException(&image->exception,&canvas_image->exception);
 280   canvas_image=DestroyImage(canvas_image);
 281   (void) CloseBlob(image);
 282   return(GetFirstImageInList(image));
 283 }
 284 \f
 285 /*
 286 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 287 %                                                                             %
 288 %                                                                             %
 289 %                                                                             %
 290 %   R e g i s t e r G R A Y I m a g e                                         %
 291 %                                                                             %
 292 %                                                                             %
 293 %                                                                             %
 294 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 295 %
 296 %  RegisterGRAYImage() adds attributes for the GRAY image format to
 297 %  the list of supported formats.  The attributes include the image format
 298 %  tag, a method to read and/or write the format, whether the format
 299 %  supports the saving of more than one frame to the same file or blob,
 300 %  whether the format supports native in-memory I/O, and a brief
 301 %  description of the format.
 302 %
 303 %  The format of the RegisterGRAYImage method is:
 304 %
 305 %      unsigned long RegisterGRAYImage(void)
 306 %
 307 */
 308 ModuleExport unsigned long RegisterGRAYImage(void)
 309 {
 310   MagickInfo
 311     *entry;
 312
 313   entry=SetMagickInfo("GRAY");
 314   entry->decoder=(DecodeImageHandler *) ReadGRAYImage;
 315   entry->encoder=(EncodeImageHandler *) WriteGRAYImage;
 316   entry->raw=MagickTrue;
 317   entry->endian_support=MagickTrue;
 318   entry->format_type=ExplicitFormatType;
 319   entry->description=ConstantString("Raw gray samples");
 320   entry->module=ConstantString("GRAY");
 321   (void) RegisterMagickInfo(entry);
 322   return(MagickImageCoderSignature);
 323 }
 324 \f
 325 /*
 326 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 327 %                                                                             %
 328 %                                                                             %
 329 %                                                                             %
 330 %   U n r e g i s t e r G R A Y I m a g e                                     %
 331 %                                                                             %
 332 %                                                                             %
 333 %                                                                             %
 334 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 335 %
 336 %  UnregisterGRAYImage() removes format registrations made by the
 337 %  GRAY module from the list of supported formats.
 338 %
 339 %  The format of the UnregisterGRAYImage method is:
 340 %
 341 %      UnregisterGRAYImage(void)
 342 %
 343 */
 344 ModuleExport void UnregisterGRAYImage(void)
 345 {
 346   (void) UnregisterMagickInfo("GRAY");
 347 }
 348 \f
 349 /*
 350 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 351 %                                                                             %
 352 %                                                                             %
 353 %                                                                             %
 354 %   W r i t e G R A Y I m a g e                                               %
 355 %                                                                             %
 356 %                                                                             %
 357 %                                                                             %
 358 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 359 %
 360 %  WriteGRAYImage() writes an image to a file as gray scale intensity
 361 %  values.
 362 %
 363 %  The format of the WriteGRAYImage method is:
 364 %
 365 %      MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
 366 %        Image *image)
 367 %
 368 %  A description of each parameter follows.
 369 %
 370 %    o image_info: the image info.
 371 %
 372 %    o image:  The image.
 373 %
 374 */
 375 static MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
 376   Image *image)
 377 {
 378   long
 379     y;
 380
 381   MagickBooleanType
 382     status;
 383
 384   MagickOffsetType
 385     scene;
 386
 387   QuantumInfo
 388     *quantum_info;
 389
 390   QuantumType
 391     quantum_type;
 392
 393   ssize_t
 394     count;
 395
 396   size_t
 397     length;
 398
 399   unsigned char
 400     *pixels;
 401
 402   /*
 403     Open output image file.
 404   */
 405   assert(image_info != (const ImageInfo *) NULL);
 406   assert(image_info->signature == MagickSignature);
 407   assert(image != (Image *) NULL);
 408   assert(image->signature == MagickSignature);
 409   if (image->debug != MagickFalse)
 410     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 411   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 412   if (status == MagickFalse)
 413     return(status);
 414   scene=0;
 415   do
 416   {
 417     /*
 418       Write grayscale pixels.
 419     */
 420     if (image->colorspace != RGBColorspace)
 421       (void) TransformImageColorspace(image,RGBColorspace);
 422     quantum_type=GrayQuantum;
 423     quantum_info=AcquireQuantumInfo(image_info,image);
 424     if (quantum_info == (QuantumInfo *) NULL)
 425       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 426     pixels=GetQuantumPixels(quantum_info);
 427     for (y=0; y < (long) image->rows; y++)
 428     {
 429       register const PixelPacket
 430         *restrict p;
 431
 432       p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 433       if (p == (const PixelPacket *) NULL)
 434         break;
 435       length=ExportQuantumPixels(image,(const CacheView *) NULL,quantum_info,
 436         quantum_type,pixels,&image->exception);
 437       count=WriteBlob(image,length,pixels);
 438       if (count != (ssize_t) length)
 439         break;
 440       if (image->previous == (Image *) NULL)
 441         {
 442           status=SetImageProgress(image,SaveImageTag,y,image->rows);
 443           if (status == MagickFalse)
 444             break;
 445         }
 446     }
 447     quantum_info=DestroyQuantumInfo(quantum_info);
 448     if (GetNextImageInList(image) == (Image *) NULL)
 449       break;
 450     image=SyncNextImageInList(image);
 451     status=SetImageProgress(image,SaveImagesTag,scene++,
 452       GetImageListLength(image));
 453     if (status == MagickFalse)
 454       break;
 455   } while (image_info->adjoin != MagickFalse);
 456   (void) CloseBlob(image);
 457   return(MagickTrue);
 458 }