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 1999-2010 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/color-private.h"
  47 #include "magick/colormap.h"
  48 #include "magick/colorspace.h"
  49 #include "magick/exception.h"
  50 #include "magick/exception-private.h"
  51 #include "magick/image.h"
  52 #include "magick/image-private.h"
  53 #include "magick/list.h"
  54 #include "magick/magick.h"
  55 #include "magick/memory_.h"
  56 #include "magick/monitor.h"
  57 #include "magick/monitor-private.h"
  58 #include "magick/quantum-private.h"
  59 #include "magick/static.h"
  60 #include "magick/string_.h"
  61 #include "magick/module.h"
  62 \f
  63 /*
  64   Forward declarations.
  65 */
  66 static MagickBooleanType
  67   WriteMONOImage(const ImageInfo *,Image *);
  68 \f
  69 /*
  70 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  71 %                                                                             %
  72 %                                                                             %
  73 %                                                                             %
  74 %   R e a d M O N O I m a g e                                                 %
  75 %                                                                             %
  76 %                                                                             %
  77 %                                                                             %
  78 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  79 %
  80 %  ReadMONOImage() reads an image of raw bites in LSB order and returns
  81 %  it.  It allocates the memory necessary for the new Image structure and
  82 %  returns a pointer to the new image.
  83 %
  84 %  The format of the ReadMONOImage method is:
  85 %
  86 %      Image *ReadMONOImage(const ImageInfo *image_info,
  87 %        ExceptionInfo *exception)
  88 %
  89 %  A description of each parameter follows:
  90 %
  91 %    o image_info: the image info.
  92 %
  93 %    o exception: return any errors or warnings in this structure.
  94 %
  95 */
  96 static Image *ReadMONOImage(const ImageInfo *image_info,
  97   ExceptionInfo *exception)
  98 {
  99   Image
 100     *image;
 101
 102   ssize_t
 103     y;
 104
 105   MagickBooleanType
 106     status;
 107
 108   register IndexPacket
 109     *indexes;
 110
 111   register ssize_t
 112     x;
 113
 114   register PixelPacket
 115     *q;
 116
 117   register ssize_t
 118     i;
 119
 120   size_t
 121     bit,
 122     byte;
 123
 124   /*
 125     Open image file.
 126   */
 127   assert(image_info != (const ImageInfo *) NULL);
 128   assert(image_info->signature == MagickSignature);
 129   if (image_info->debug != MagickFalse)
 130     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 131       image_info->filename);
 132   assert(exception != (ExceptionInfo *) NULL);
 133   assert(exception->signature == MagickSignature);
 134   image=AcquireImage(image_info);
 135   if ((image->columns == 0) || (image->rows == 0))
 136     ThrowReaderException(OptionError,"MustSpecifyImageSize");
 137   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 138   if (status == MagickFalse)
 139     {
 140       image=DestroyImageList(image);
 141       return((Image *) NULL);
 142     }
 143   for (i=0; i < image->offset; i++)
 144     if (ReadBlobByte(image) == EOF)
 145       {
 146         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 147           image->filename);
 148         break;
 149       }
 150   /*
 151     Initialize image colormap.
 152   */
 153   image->depth=1;
 154   if (AcquireImageColormap(image,2) == MagickFalse)
 155     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 156   if (image_info->ping != MagickFalse)
 157     {
 158       (void) CloseBlob(image);
 159       return(GetFirstImageInList(image));
 160     }
 161   /*
 162     Convert bi-level image to pixel packets.
 163   */
 164   for (y=0; y < (ssize_t) image->rows; y++)
 165   {
 166     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 167     if (q == (PixelPacket *) NULL)
 168       break;
 169     indexes=GetAuthenticIndexQueue(image);
 170     bit=0;
 171     byte=0;
 172     for (x=0; x < (ssize_t) image->columns; x++)
 173     {
 174       if (bit == 0)
 175         byte=(size_t) ReadBlobByte(image);
 176       if (image_info->endian == LSBEndian)
 177         indexes[x]=(IndexPacket) (((byte & 0x01) != 0) ? 0x00 : 0x01);
 178       else
 179         indexes[x]=(IndexPacket) (((byte & 0x01) != 0) ? 0x01 : 0x00);
 180       bit++;
 181       if (bit == 8)
 182         bit=0;
 183       byte>>=1;
 184     }
 185     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 186       break;
 187     status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 188                 image->rows);
 189     if (status == MagickFalse)
 190       break;
 191   }
 192   (void) SyncImage(image);
 193   if (EOFBlob(image) != MagickFalse)
 194     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 195       image->filename);
 196   (void) CloseBlob(image);
 197   return(GetFirstImageInList(image));
 198 }
 199 \f
 200 /*
 201 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 202 %                                                                             %
 203 %                                                                             %
 204 %                                                                             %
 205 %   R e g i s t e r M O N O I m a g e                                         %
 206 %                                                                             %
 207 %                                                                             %
 208 %                                                                             %
 209 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 210 %
 211 %  RegisterMONOImage() adds attributes for the MONO image format to
 212 %  the list of supported formats.  The attributes include the image format
 213 %  tag, a method to read and/or write the format, whether the format
 214 %  supports the saving of more than one frame to the same file or blob,
 215 %  whether the format supports native in-memory I/O, and a brief
 216 %  description of the format.
 217 %
 218 %  The format of the RegisterMONOImage method is:
 219 %
 220 %      size_t RegisterMONOImage(void)
 221 %
 222 */
 223 ModuleExport size_t RegisterMONOImage(void)
 224 {
 225   MagickInfo
 226     *entry;
 227
 228   entry=SetMagickInfo("MONO");
 229   entry->decoder=(DecodeImageHandler *) ReadMONOImage;
 230   entry->encoder=(EncodeImageHandler *) WriteMONOImage;
 231   entry->raw=MagickTrue;
 232   entry->endian_support=MagickTrue;
 233   entry->adjoin=MagickFalse;
 234   entry->description=ConstantString("Raw bi-level bitmap");
 235   entry->module=ConstantString("MONO");
 236   (void) RegisterMagickInfo(entry);
 237   return(MagickImageCoderSignature);
 238 }
 239 \f
 240 /*
 241 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 242 %                                                                             %
 243 %                                                                             %
 244 %                                                                             %
 245 %   U n r e g i s t e r M O N O I m a g e                                     %
 246 %                                                                             %
 247 %                                                                             %
 248 %                                                                             %
 249 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 250 %
 251 %  UnregisterMONOImage() removes format registrations made by the
 252 %  MONO module from the list of supported formats.
 253 %
 254 %  The format of the UnregisterMONOImage method is:
 255 %
 256 %      UnregisterMONOImage(void)
 257 %
 258 */
 259 ModuleExport void UnregisterMONOImage(void)
 260 {
 261   (void) UnregisterMagickInfo("MONO");
 262 }
 263 \f
 264 /*
 265 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 266 %                                                                             %
 267 %                                                                             %
 268 %                                                                             %
 269 %   W r i t e M O N O I m a g e                                               %
 270 %                                                                             %
 271 %                                                                             %
 272 %                                                                             %
 273 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 274 %
 275 %  WriteMONOImage() writes an image of raw bits in LSB order to a file.
 276 %
 277 %  The format of the WriteMONOImage method is:
 278 %
 279 %      MagickBooleanType WriteMONOImage(const ImageInfo *image_info,
 280 %        Image *image)
 281 %
 282 %  A description of each parameter follows.
 283 %
 284 %    o image_info: the image info.
 285 %
 286 %    o image:  The image.
 287 %
 288 */
 289 static MagickBooleanType WriteMONOImage(const ImageInfo *image_info,
 290   Image *image)
 291 {
 292   ssize_t
 293     y;
 294
 295   MagickBooleanType
 296     status;
 297
 298   register const IndexPacket
 299     *indexes;
 300
 301   register const PixelPacket
 302     *p;
 303
 304   register ssize_t
 305     x;
 306
 307   size_t
 308     bit,
 309     byte;
 310
 311   /*
 312     Open output image file.
 313   */
 314   assert(image_info != (const ImageInfo *) NULL);
 315   assert(image_info->signature == MagickSignature);
 316   assert(image != (Image *) NULL);
 317   assert(image->signature == MagickSignature);
 318   if (image->debug != MagickFalse)
 319     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 320   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 321   if (status == MagickFalse)
 322     return(status);
 323   if (image->colorspace != RGBColorspace)
 324     (void) TransformImageColorspace(image,RGBColorspace);
 325   /*
 326     Convert image to a bi-level image.
 327   */
 328   (void) SetImageType(image,BilevelType);
 329   for (y=0; y < (ssize_t) image->rows; y++)
 330   {
 331     p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 332     if (p == (const PixelPacket *) NULL)
 333       break;
 334     indexes=GetVirtualIndexQueue(image);
 335     bit=0;
 336     byte=0;
 337     for (x=0; x < (ssize_t) image->columns; x++)
 338     {
 339       byte>>=1;
 340       if (image->endian == LSBEndian)
 341         {
 342           if (PixelIntensity(p) < ((Quantum) QuantumRange/2.0))
 343             byte|=0x80;
 344         }
 345       else
 346         if (PixelIntensity(p) >= ((Quantum) QuantumRange/2.0))
 347           byte|=0x80;
 348       bit++;
 349       if (bit == 8)
 350         {
 351           (void) WriteBlobByte(image,(unsigned char) byte);
 352           bit=0;
 353           byte=0;
 354         }
 355       p++;
 356     }
 357     if (bit != 0)
 358       (void) WriteBlobByte(image,(unsigned char) (byte >> (8-bit)));
 359     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 360                 image->rows);
 361     if (status == MagickFalse)
 362       break;
 363   }
 364   (void) CloseBlob(image);
 365   return(MagickTrue);
 366 }