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 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2017 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/attribute.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/colorspace.h"
  48 #include "MagickCore/colorspace-private.h"
  49 #include "MagickCore/constitute.h"
  50 #include "MagickCore/exception.h"
  51 #include "MagickCore/exception-private.h"
  52 #include "MagickCore/image.h"
  53 #include "MagickCore/image-private.h"
  54 #include "MagickCore/list.h"
  55 #include "MagickCore/magick.h"
  56 #include "MagickCore/memory_.h"
  57 #include "MagickCore/monitor.h"
  58 #include "MagickCore/monitor-private.h"
  59 #include "MagickCore/pixel.h"
  60 #include "MagickCore/pixel-accessor.h"
  61 #include "MagickCore/quantum-private.h"
  62 #include "MagickCore/static.h"
  63 #include "MagickCore/statistic.h"
  64 #include "MagickCore/string_.h"
  65 #include "MagickCore/module.h"
  66 \f
  67 /*
  68   Forward declarations.
  69 */
  70 static MagickBooleanType
  71   WriteGRAYImage(const ImageInfo *,Image *,ExceptionInfo *);
  72 \f
  73 /*
  74 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  75 %                                                                             %
  76 %                                                                             %
  77 %                                                                             %
  78 %   R e a d G R A Y I m a g e                                                 %
  79 %                                                                             %
  80 %                                                                             %
  81 %                                                                             %
  82 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  83 %
  84 %  ReadGRAYImage() reads an image of raw grayscale samples and returns
  85 %  it.  It allocates the memory necessary for the new Image structure and
  86 %  returns a pointer to the new image.
  87 %
  88 %  The format of the ReadGRAYImage method is:
  89 %
  90 %      Image *ReadGRAYImage(const ImageInfo *image_info,
  91 %        ExceptionInfo *exception)
  92 %
  93 %  A description of each parameter follows:
  94 %
  95 %    o image_info: the image info.
  96 %
  97 %    o exception: return any errors or warnings in this structure.
  98 %
  99 */
 100 static Image *ReadGRAYImage(const ImageInfo *image_info,
 101   ExceptionInfo *exception)
 102 {
 103   const unsigned char
 104     *pixels;
 105
 106   Image
 107     *canvas_image,
 108     *image;
 109
 110   MagickBooleanType
 111     status;
 112
 113   MagickOffsetType
 114     scene;
 115
 116   QuantumInfo
 117     *quantum_info;
 118
 119   QuantumType
 120     quantum_type;
 121
 122   size_t
 123     length;
 124
 125   ssize_t
 126     count,
 127     y;
 128
 129   /*
 130     Open image file.
 131   */
 132   assert(image_info != (const ImageInfo *) NULL);
 133   assert(image_info->signature == MagickCoreSignature);
 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 == MagickCoreSignature);
 139   image=AcquireImage(image_info,exception);
 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   SetImageColorspace(image,GRAYColorspace,exception);
 155   canvas_image=CloneImage(image,image->extract_info.width,1,MagickFalse,
 156     exception);
 157   (void) SetImageVirtualPixelMethod(canvas_image,BlackVirtualPixelMethod,
 158     exception);
 159   quantum_type=GrayQuantum;
 160   quantum_info=AcquireQuantumInfo(image_info,canvas_image);
 161   if (quantum_info == (QuantumInfo *) NULL)
 162     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 163   pixels=(const unsigned char *) NULL;
 164   if (image_info->number_scenes != 0)
 165     while (image->scene < image_info->scene)
 166     {
 167       /*
 168         Skip to next image.
 169       */
 170       image->scene++;
 171       length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
 172       for (y=0; y < (ssize_t) image->rows; y++)
 173       {
 174         pixels=(const unsigned char *) ReadBlobStream(image,length,
 175           GetQuantumPixels(quantum_info),&count);
 176         if (count != (ssize_t) length)
 177           break;
 178       }
 179     }
 180   scene=0;
 181   count=0;
 182   length=0;
 183   do
 184   {
 185     /*
 186       Read pixels to virtual canvas image then push to image.
 187     */
 188     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 189       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 190         break;
 191     status=SetImageExtent(image,image->columns,image->rows,exception);
 192     if (status == MagickFalse)
 193       return(DestroyImageList(image));
 194     SetImageColorspace(image,GRAYColorspace,exception);
 195     if (scene == 0)
 196       {
 197         length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
 198         pixels=(const unsigned char *) ReadBlobStream(image,length,
 199           GetQuantumPixels(quantum_info),&count);
 200       }
 201     for (y=0; y < (ssize_t) image->extract_info.height; y++)
 202     {
 203       register const Quantum
 204         *magick_restrict p;
 205
 206       register ssize_t
 207         x;
 208
 209       register Quantum
 210         *magick_restrict q;
 211
 212       if (count != (ssize_t) length)
 213         {
 214           ThrowFileException(exception,CorruptImageError,
 215             "UnexpectedEndOfFile",image->filename);
 216           break;
 217         }
 218       q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,exception);
 219       if (q == (Quantum *) NULL)
 220         break;
 221       length=ImportQuantumPixels(canvas_image,(CacheView *) NULL,quantum_info,
 222         quantum_type,pixels,exception);
 223       if (SyncAuthenticPixels(canvas_image,exception) == MagickFalse)
 224         break;
 225       if (((y-image->extract_info.y) >= 0) &&
 226           ((y-image->extract_info.y) < (ssize_t) image->rows))
 227         {
 228           p=GetVirtualPixels(canvas_image,canvas_image->extract_info.x,0,
 229             image->columns,1,exception);
 230           q=QueueAuthenticPixels(image,0,y-image->extract_info.y,image->columns,
 231             1,exception);
 232           if ((p == (const Quantum *) NULL) ||
 233               (q == (Quantum *) NULL))
 234             break;
 235           for (x=0; x < (ssize_t) image->columns; x++)
 236           {
 237             SetPixelGray(image,GetPixelGray(canvas_image,p),q);
 238             p+=GetPixelChannels(canvas_image);
 239             q+=GetPixelChannels(image);
 240           }
 241           if (SyncAuthenticPixels(image,exception) == MagickFalse)
 242             break;
 243         }
 244       if (image->previous == (Image *) NULL)
 245         {
 246           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 247             image->rows);
 248           if (status == MagickFalse)
 249             break;
 250         }
 251       pixels=(const unsigned char *) ReadBlobStream(image,length,
 252         GetQuantumPixels(quantum_info),&count);
 253     }
 254     SetQuantumImageType(image,quantum_type);
 255     /*
 256       Proceed to next image.
 257     */
 258     if (image_info->number_scenes != 0)
 259       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 260         break;
 261     if (count == (ssize_t) length)
 262       {
 263         /*
 264           Allocate next image structure.
 265         */
 266         AcquireNextImage(image_info,image,exception);
 267         if (GetNextImageInList(image) == (Image *) NULL)
 268           {
 269             image=DestroyImageList(image);
 270             return((Image *) NULL);
 271           }
 272         image=SyncNextImageInList(image);
 273         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 274           GetBlobSize(image));
 275         if (status == MagickFalse)
 276           break;
 277       }
 278     scene++;
 279   } while (count == (ssize_t) length);
 280   quantum_info=DestroyQuantumInfo(quantum_info);
 281   canvas_image=DestroyImage(canvas_image);
 282   (void) CloseBlob(image);
 283   return(GetFirstImageInList(image));
 284 }
 285 \f
 286 /*
 287 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 288 %                                                                             %
 289 %                                                                             %
 290 %                                                                             %
 291 %   R e g i s t e r G R A Y I m a g e                                         %
 292 %                                                                             %
 293 %                                                                             %
 294 %                                                                             %
 295 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 296 %
 297 %  RegisterGRAYImage() adds attributes for the GRAY image format to
 298 %  the list of supported formats.  The attributes include the image format
 299 %  tag, a method to read and/or write the format, whether the format
 300 %  supports the saving of more than one frame to the same file or blob,
 301 %  whether the format supports native in-memory I/O, and a brief
 302 %  description of the format.
 303 %
 304 %  The format of the RegisterGRAYImage method is:
 305 %
 306 %      size_t RegisterGRAYImage(void)
 307 %
 308 */
 309 ModuleExport size_t RegisterGRAYImage(void)
 310 {
 311   MagickInfo
 312     *entry;
 313
 314   entry=AcquireMagickInfo("GRAY","GRAY","Raw gray samples");
 315   entry->decoder=(DecodeImageHandler *) ReadGRAYImage;
 316   entry->encoder=(EncodeImageHandler *) WriteGRAYImage;
 317   entry->flags|=CoderRawSupportFlag;
 318   entry->flags|=CoderEndianSupportFlag;
 319   (void) RegisterMagickInfo(entry);
 320   return(MagickImageCoderSignature);
 321 }
 322 \f
 323 /*
 324 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 325 %                                                                             %
 326 %                                                                             %
 327 %                                                                             %
 328 %   U n r e g i s t e r G R A Y I m a g e                                     %
 329 %                                                                             %
 330 %                                                                             %
 331 %                                                                             %
 332 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 333 %
 334 %  UnregisterGRAYImage() removes format registrations made by the
 335 %  GRAY module from the list of supported formats.
 336 %
 337 %  The format of the UnregisterGRAYImage method is:
 338 %
 339 %      UnregisterGRAYImage(void)
 340 %
 341 */
 342 ModuleExport void UnregisterGRAYImage(void)
 343 {
 344   (void) UnregisterMagickInfo("GRAY");
 345 }
 346 \f
 347 /*
 348 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 349 %                                                                             %
 350 %                                                                             %
 351 %                                                                             %
 352 %   W r i t e G R A Y I m a g e                                               %
 353 %                                                                             %
 354 %                                                                             %
 355 %                                                                             %
 356 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 357 %
 358 %  WriteGRAYImage() writes an image to a file as gray scale intensity
 359 %  values.
 360 %
 361 %  The format of the WriteGRAYImage method is:
 362 %
 363 %      MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
 364 %        Image *image,ExceptionInfo *exception)
 365 %
 366 %  A description of each parameter follows.
 367 %
 368 %    o image_info: the image info.
 369 %
 370 %    o image:  The image.
 371 %
 372 %    o exception: return any errors or warnings in this structure.
 373 %
 374 */
 375 static MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
 376   Image *image,ExceptionInfo *exception)
 377 {
 378   MagickBooleanType
 379     status;
 380
 381   MagickOffsetType
 382     scene;
 383
 384   QuantumInfo
 385     *quantum_info;
 386
 387   QuantumType
 388     quantum_type;
 389
 390   size_t
 391     length;
 392
 393   ssize_t
 394     count,
 395     y;
 396
 397   unsigned char
 398     *pixels;
 399
 400   /*
 401     Open output image file.
 402   */
 403   assert(image_info != (const ImageInfo *) NULL);
 404   assert(image_info->signature == MagickCoreSignature);
 405   assert(image != (Image *) NULL);
 406   assert(image->signature == MagickCoreSignature);
 407   if (image->debug != MagickFalse)
 408     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 409   assert(exception != (ExceptionInfo *) NULL);
 410   assert(exception->signature == MagickCoreSignature);
 411   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 412   if (status == MagickFalse)
 413     return(status);
 414   scene=0;
 415   do
 416   {
 417     /*
 418       Write grayscale pixels.
 419     */
 420     (void) TransformImageColorspace(image,sRGBColorspace,exception);
 421     quantum_type=GrayQuantum;
 422     quantum_info=AcquireQuantumInfo(image_info,image);
 423     if (quantum_info == (QuantumInfo *) NULL)
 424       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 425     pixels=(unsigned char *) GetQuantumPixels(quantum_info);
 426     for (y=0; y < (ssize_t) image->rows; y++)
 427     {
 428       register const Quantum
 429         *magick_restrict p;
 430
 431       p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 432       if (p == (const Quantum *) NULL)
 433         break;
 434       length=ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
 435         quantum_type,pixels,exception);
 436       count=WriteBlob(image,length,pixels);
 437       if (count != (ssize_t) length)
 438         break;
 439       if (image->previous == (Image *) NULL)
 440         {
 441           status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 442             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 }