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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                         M   M   OOO   N   N   OOO                           %
   7 %                         MM MM  O   O  NN  N  O   O                          %
   8 %                         M M M  O   O  N N N  O   O                          %
   9 %                         M   M  O   O  N  NN  O   O                          %
  10 %                         M   M   OOO   N   N   OOO                           %
  11 %                                                                             %
  12 %                                                                             %
  13 %                   Read/Write Raw Bi-Level Bitmap 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 "MagickCore/studio.h"
  43 #include "MagickCore/blob.h"
  44 #include "MagickCore/blob-private.h"
  45 #include "MagickCore/cache.h"
  46 #include "MagickCore/color-private.h"
  47 #include "MagickCore/colormap.h"
  48 #include "MagickCore/colorspace.h"
  49 #include "MagickCore/exception.h"
  50 #include "MagickCore/exception-private.h"
  51 #include "MagickCore/image.h"
  52 #include "MagickCore/image-private.h"
  53 #include "MagickCore/list.h"
  54 #include "MagickCore/magick.h"
  55 #include "MagickCore/memory_.h"
  56 #include "MagickCore/monitor.h"
  57 #include "MagickCore/monitor-private.h"
  58 #include "MagickCore/pixel-accessor.h"
  59 #include "MagickCore/quantum-private.h"
  60 #include "MagickCore/static.h"
  61 #include "MagickCore/string_.h"
  62 #include "MagickCore/module.h"
  63 \f
  64 /*
  65   Forward declarations.
  66 */
  67 static MagickBooleanType
  68   WriteMONOImage(const ImageInfo *,Image *);
  69 \f
  70 /*
  71 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  72 %                                                                             %
  73 %                                                                             %
  74 %                                                                             %
  75 %   R e a d M O N O I m a g e                                                 %
  76 %                                                                             %
  77 %                                                                             %
  78 %                                                                             %
  79 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  80 %
  81 %  ReadMONOImage() reads an image of raw bites in LSB order and returns
  82 %  it.  It allocates the memory necessary for the new Image structure and
  83 %  returns a pointer to the new image.
  84 %
  85 %  The format of the ReadMONOImage method is:
  86 %
  87 %      Image *ReadMONOImage(const ImageInfo *image_info,
  88 %        ExceptionInfo *exception)
  89 %
  90 %  A description of each parameter follows:
  91 %
  92 %    o image_info: the image info.
  93 %
  94 %    o exception: return any errors or warnings in this structure.
  95 %
  96 */
  97 static Image *ReadMONOImage(const ImageInfo *image_info,
  98   ExceptionInfo *exception)
  99 {
 100   Image
 101     *image;
 102
 103   MagickBooleanType
 104     status;
 105
 106   register Quantum
 107     *q;
 108
 109   register ssize_t
 110     x;
 111
 112   size_t
 113     bit,
 114     byte;
 115
 116   ssize_t
 117     y;
 118
 119   /*
 120     Open image file.
 121   */
 122   assert(image_info != (const ImageInfo *) NULL);
 123   assert(image_info->signature == MagickSignature);
 124   if (image_info->debug != MagickFalse)
 125     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 126       image_info->filename);
 127   assert(exception != (ExceptionInfo *) NULL);
 128   assert(exception->signature == MagickSignature);
 129   image=AcquireImage(image_info);
 130   if ((image->columns == 0) || (image->rows == 0))
 131     ThrowReaderException(OptionError,"MustSpecifyImageSize");
 132   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 133   if (status == MagickFalse)
 134     {
 135       image=DestroyImageList(image);
 136       return((Image *) NULL);
 137     }
 138   if (DiscardBlobBytes(image,image->offset) == MagickFalse)
 139     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 140       image->filename);
 141   /*
 142     Initialize image colormap.
 143   */
 144   image->depth=1;
 145   if (AcquireImageColormap(image,2) == MagickFalse)
 146     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 147   if (image_info->ping != MagickFalse)
 148     {
 149       (void) CloseBlob(image);
 150       return(GetFirstImageInList(image));
 151     }
 152   /*
 153     Convert bi-level image to pixel packets.
 154   */
 155   for (y=0; y < (ssize_t) image->rows; y++)
 156   {
 157     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 158     if (q == (const Quantum *) NULL)
 159       break;
 160     bit=0;
 161     byte=0;
 162     for (x=0; x < (ssize_t) image->columns; x++)
 163     {
 164       if (bit == 0)
 165         byte=(size_t) ReadBlobByte(image);
 166       if (image_info->endian == LSBEndian)
 167         SetPixelIndex(image,((byte & 0x01) != 0) ? 0x00 : 0x01,q);
 168       else
 169         SetPixelIndex(image,((byte & 0x01) != 0) ? 0x01 : 0x00,q);
 170       bit++;
 171       if (bit == 8)
 172         bit=0;
 173       byte>>=1;
 174       q+=GetPixelChannels(image);
 175     }
 176     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 177       break;
 178     status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 179       image->rows);
 180     if (status == MagickFalse)
 181       break;
 182   }
 183   (void) SyncImage(image);
 184   if (EOFBlob(image) != MagickFalse)
 185     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 186       image->filename);
 187   (void) CloseBlob(image);
 188   return(GetFirstImageInList(image));
 189 }
 190 \f
 191 /*
 192 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 193 %                                                                             %
 194 %                                                                             %
 195 %                                                                             %
 196 %   R e g i s t e r M O N O I m a g e                                         %
 197 %                                                                             %
 198 %                                                                             %
 199 %                                                                             %
 200 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 201 %
 202 %  RegisterMONOImage() adds attributes for the MONO image format to
 203 %  the list of supported formats.  The attributes include the image format
 204 %  tag, a method to read and/or write the format, whether the format
 205 %  supports the saving of more than one frame to the same file or blob,
 206 %  whether the format supports native in-memory I/O, and a brief
 207 %  description of the format.
 208 %
 209 %  The format of the RegisterMONOImage method is:
 210 %
 211 %      size_t RegisterMONOImage(void)
 212 %
 213 */
 214 ModuleExport size_t RegisterMONOImage(void)
 215 {
 216   MagickInfo
 217     *entry;
 218
 219   entry=SetMagickInfo("MONO");
 220   entry->decoder=(DecodeImageHandler *) ReadMONOImage;
 221   entry->encoder=(EncodeImageHandler *) WriteMONOImage;
 222   entry->raw=MagickTrue;
 223   entry->endian_support=MagickTrue;
 224   entry->adjoin=MagickFalse;
 225   entry->description=ConstantString("Raw bi-level bitmap");
 226   entry->module=ConstantString("MONO");
 227   (void) RegisterMagickInfo(entry);
 228   return(MagickImageCoderSignature);
 229 }
 230 \f
 231 /*
 232 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 233 %                                                                             %
 234 %                                                                             %
 235 %                                                                             %
 236 %   U n r e g i s t e r M O N O I m a g e                                     %
 237 %                                                                             %
 238 %                                                                             %
 239 %                                                                             %
 240 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 241 %
 242 %  UnregisterMONOImage() removes format registrations made by the
 243 %  MONO module from the list of supported formats.
 244 %
 245 %  The format of the UnregisterMONOImage method is:
 246 %
 247 %      UnregisterMONOImage(void)
 248 %
 249 */
 250 ModuleExport void UnregisterMONOImage(void)
 251 {
 252   (void) UnregisterMagickInfo("MONO");
 253 }
 254 \f
 255 /*
 256 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 257 %                                                                             %
 258 %                                                                             %
 259 %                                                                             %
 260 %   W r i t e M O N O I m a g e                                               %
 261 %                                                                             %
 262 %                                                                             %
 263 %                                                                             %
 264 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 265 %
 266 %  WriteMONOImage() writes an image of raw bits in LSB order to a file.
 267 %
 268 %  The format of the WriteMONOImage method is:
 269 %
 270 %      MagickBooleanType WriteMONOImage(const ImageInfo *image_info,
 271 %        Image *image)
 272 %
 273 %  A description of each parameter follows.
 274 %
 275 %    o image_info: the image info.
 276 %
 277 %    o image:  The image.
 278 %
 279 */
 280 static MagickBooleanType WriteMONOImage(const ImageInfo *image_info,
 281   Image *image)
 282 {
 283   MagickBooleanType
 284     status;
 285
 286   register const Quantum
 287     *p;
 288
 289   register ssize_t
 290     x;
 291
 292   size_t
 293     bit,
 294     byte;
 295
 296   ssize_t
 297     y;
 298
 299   /*
 300     Open output image file.
 301   */
 302   assert(image_info != (const ImageInfo *) NULL);
 303   assert(image_info->signature == MagickSignature);
 304   assert(image != (Image *) NULL);
 305   assert(image->signature == MagickSignature);
 306   if (image->debug != MagickFalse)
 307     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 308   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 309   if (status == MagickFalse)
 310     return(status);
 311   if (image->colorspace != RGBColorspace)
 312     (void) TransformImageColorspace(image,RGBColorspace);
 313   /*
 314     Convert image to a bi-level image.
 315   */
 316   (void) SetImageType(image,BilevelType);
 317   for (y=0; y < (ssize_t) image->rows; y++)
 318   {
 319     p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 320     if (p == (const Quantum *) NULL)
 321       break;
 322     bit=0;
 323     byte=0;
 324     for (x=0; x < (ssize_t) image->columns; x++)
 325     {
 326       byte>>=1;
 327       if (image->endian == LSBEndian)
 328         {
 329           if (GetPixelIntensity(image,p) < ((Quantum) QuantumRange/2.0))
 330             byte|=0x80;
 331         }
 332       else
 333         if (GetPixelIntensity(image,p) >= ((Quantum) QuantumRange/2.0))
 334           byte|=0x80;
 335       bit++;
 336       if (bit == 8)
 337         {
 338           (void) WriteBlobByte(image,(unsigned char) byte);
 339           bit=0;
 340           byte=0;
 341         }
 342       p+=GetPixelChannels(image);
 343     }
 344     if (bit != 0)
 345       (void) WriteBlobByte(image,(unsigned char) (byte >> (8-bit)));
 346     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 347       image->rows);
 348     if (status == MagickFalse)
 349       break;
 350   }
 351   (void) CloseBlob(image);
 352   return(MagickTrue);
 353 }