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