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