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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                         W   W  BBBB   M   M  PPPP                           %
   7 %                         W   W  B   B  MM MM  P   P                          %
   8 %                         W W W  BBBB   M M M  PPPP                           %
   9 %                         WW WW  B   B  M   M  P                              %
  10 %                         W   W  BBBB   M   M  P                              %
  11 %                                                                             %
  12 %                                                                             %
  13 %               Read/Write Wireless Bitmap (level 0) Image Format             %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                               January 2000                                  %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2012 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 /*
  39   Include declarations.
  40 */
  41 #include "MagickCore/studio.h"
  42 #include "MagickCore/attribute.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   WriteWBMPImage(const ImageInfo *,Image *,ExceptionInfo *);
  70 \f
  71 /*
  72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  73 %                                                                             %
  74 %                                                                             %
  75 %                                                                             %
  76 %   R e a d W B M P I m a g e                                                 %
  77 %                                                                             %
  78 %                                                                             %
  79 %                                                                             %
  80 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  81 %
  82 %  ReadWBMPImage() reads a WBMP (level 0) image file and returns it.  It
  83 %  allocates the memory necessary for the new Image structure and returns a
  84 %  pointer to the new image.
  85 %
  86 %  ReadWBMPImage was contributed by Milan Votava <votava@mageo.cz>.
  87 %
  88 %  The format of the ReadWBMPImage method is:
  89 %
  90 %      Image *ReadWBMPImage(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
 101 static MagickBooleanType WBMPReadInteger(Image *image,size_t *value)
 102 {
 103   int
 104     byte;
 105
 106   *value=0;
 107   do
 108   {
 109     byte=ReadBlobByte(image);
 110     if (byte == EOF)
 111       return(MagickFalse);
 112     *value<<=7;
 113     *value|=(unsigned int) (byte & 0x7f);
 114   } while (byte & 0x80);
 115   return(MagickTrue);
 116 }
 117
 118 static Image *ReadWBMPImage(const ImageInfo *image_info,
 119   ExceptionInfo *exception)
 120 {
 121   Image
 122     *image;
 123
 124   int
 125     byte;
 126
 127   MagickBooleanType
 128     status;
 129
 130   register ssize_t
 131     x;
 132
 133   register Quantum
 134     *q;
 135
 136   ssize_t
 137     y;
 138
 139   unsigned char
 140     bit;
 141
 142   unsigned short
 143     header;
 144
 145   /*
 146     Open image file.
 147   */
 148   assert(image_info != (const ImageInfo *) NULL);
 149   assert(image_info->signature == MagickSignature);
 150   if (image_info->debug != MagickFalse)
 151     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 152       image_info->filename);
 153   assert(exception != (ExceptionInfo *) NULL);
 154   assert(exception->signature == MagickSignature);
 155   image=AcquireImage(image_info,exception);
 156   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 157   if (status == MagickFalse)
 158     {
 159       image=DestroyImageList(image);
 160       return((Image *) NULL);
 161     }
 162   if (ReadBlob(image,2,(unsigned char *) &header) == 0)
 163     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 164   if (header != 0)
 165     ThrowReaderException(CoderError,"OnlyLevelZerofilesSupported");
 166   /*
 167     Initialize image structure.
 168   */
 169   if (WBMPReadInteger(image,&image->columns) == MagickFalse)
 170     ThrowReaderException(CorruptImageError,"CorruptWBMPimage");
 171   if (WBMPReadInteger(image,&image->rows) == MagickFalse)
 172     ThrowReaderException(CorruptImageError,"CorruptWBMPimage");
 173   if ((image->columns == 0) || (image->rows == 0))
 174     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 175   if (DiscardBlobBytes(image,image->offset) == MagickFalse)
 176     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 177       image->filename);
 178   if (AcquireImageColormap(image,2,exception) == MagickFalse)
 179     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 180   if (image_info->ping != MagickFalse)
 181     {
 182       (void) CloseBlob(image);
 183       return(GetFirstImageInList(image));
 184     }
 185   /*
 186     Convert bi-level image to pixel packets.
 187   */
 188   for (y=0; y < (ssize_t) image->rows; y++)
 189   {
 190     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 191     if (q == (Quantum *) NULL)
 192       break;
 193     bit=0;
 194     byte=0;
 195     for (x=0; x < (ssize_t) image->columns; x++)
 196     {
 197       if (bit == 0)
 198         {
 199           byte=ReadBlobByte(image);
 200           if (byte == EOF)
 201             ThrowReaderException(CorruptImageError,"CorruptImage");
 202         }
 203       SetPixelIndex(image,(byte & (0x01 << (7-bit))) ? 1 : 0,q);
 204       bit++;
 205       if (bit == 8)
 206         bit=0;
 207       q+=GetPixelChannels(image);
 208     }
 209     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 210       break;
 211     status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 212                 image->rows);
 213     if (status == MagickFalse)
 214       break;
 215   }
 216   (void) SyncImage(image,exception);
 217   if (EOFBlob(image) != MagickFalse)
 218     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 219       image->filename);
 220   (void) CloseBlob(image);
 221   return(GetFirstImageInList(image));
 222 }
 223 \f
 224 /*
 225 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 226 %                                                                             %
 227 %                                                                             %
 228 %                                                                             %
 229 %   R e g i s t e r W B M P I m a g e                                         %
 230 %                                                                             %
 231 %                                                                             %
 232 %                                                                             %
 233 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 234 %
 235 %  RegisterWBMPImage() adds attributes for the WBMP image format to
 236 %  the list of supported formats.  The attributes include the image format
 237 %  tag, a method to read and/or write the format, whether the format
 238 %  supports the saving of more than one frame to the same file or blob,
 239 %  whether the format supports native in-memory I/O, and a brief
 240 %  description of the format.
 241 %
 242 %  The format of the RegisterWBMPImage method is:
 243 %
 244 %      size_t RegisterWBMPImage(void)
 245 %
 246 */
 247 ModuleExport size_t RegisterWBMPImage(void)
 248 {
 249   MagickInfo
 250     *entry;
 251
 252   entry=SetMagickInfo("WBMP");
 253   entry->decoder=(DecodeImageHandler *) ReadWBMPImage;
 254   entry->encoder=(EncodeImageHandler *) WriteWBMPImage;
 255   entry->adjoin=MagickFalse;
 256   entry->description=ConstantString("Wireless Bitmap (level 0) image");
 257   entry->module=ConstantString("WBMP");
 258   (void) RegisterMagickInfo(entry);
 259   return(MagickImageCoderSignature);
 260 }
 261 \f
 262 /*
 263 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 264 %                                                                             %
 265 %                                                                             %
 266 %                                                                             %
 267 %   U n r e g i s t e r W B M P I m a g e                                     %
 268 %                                                                             %
 269 %                                                                             %
 270 %                                                                             %
 271 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 272 %
 273 %  UnregisterWBMPImage() removes format registrations made by the
 274 %  WBMP module from the list of supported formats.
 275 %
 276 %  The format of the UnregisterWBMPImage method is:
 277 %
 278 %      UnregisterWBMPImage(void)
 279 %
 280 */
 281 ModuleExport void UnregisterWBMPImage(void)
 282 {
 283   (void) UnregisterMagickInfo("WBMP");
 284 }
 285 \f
 286 /*
 287 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 288 %                                                                             %
 289 %                                                                             %
 290 %                                                                             %
 291 %   W r i t e W B M P I m a g e                                               %
 292 %                                                                             %
 293 %                                                                             %
 294 %                                                                             %
 295 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 296 %
 297 %  WriteWBMPImage() writes an image to a file in the Wireless Bitmap
 298 %  (level 0) image format.
 299 %
 300 %  WriteWBMPImage was contributed by Milan Votava <votava@mageo.cz>.
 301 %
 302 %  The format of the WriteWBMPImage method is:
 303 %
 304 %      MagickBooleanType WriteWBMPImage(const ImageInfo *image_info,
 305 %        Image *image,ExceptionInfo *exception)
 306 %
 307 %  A description of each parameter follows.
 308 %
 309 %    o image_info: the image info.
 310 %
 311 %    o image:  The image.
 312 %
 313 %    o exception: return any errors or warnings in this structure.
 314 %
 315 */
 316
 317 static void WBMPWriteInteger(Image *image,const size_t value)
 318 {
 319   int
 320     bits,
 321     flag,
 322     n;
 323
 324   register ssize_t
 325     i;
 326
 327   unsigned char
 328     buffer[5],
 329     octet;
 330
 331   n=1;
 332   bits=28;
 333   flag=MagickFalse;
 334   for (i=4; i >= 0; i--)
 335   {
 336     octet=(unsigned char) ((value >> bits) & 0x7f);
 337     if ((flag == 0) && (octet != 0))
 338       {
 339         flag=MagickTrue;
 340         n=i+1;
 341       }
 342     buffer[4-i]=octet | (i && (flag || octet))*(0x01 << 7);
 343     bits-=7;
 344   }
 345   (void) WriteBlob(image,(size_t) n,buffer+5-n);
 346 }
 347
 348 static MagickBooleanType WriteWBMPImage(const ImageInfo *image_info,
 349   Image *image,ExceptionInfo *exception)
 350 {
 351   MagickBooleanType
 352     status;
 353
 354   register const Quantum
 355     *p;
 356
 357   register ssize_t
 358     x;
 359
 360   ssize_t
 361     y;
 362
 363   unsigned char
 364     bit,
 365     byte;
 366
 367   /*
 368     Open output image file.
 369   */
 370   assert(image_info != (const ImageInfo *) NULL);
 371   assert(image_info->signature == MagickSignature);
 372   assert(image != (Image *) NULL);
 373   assert(image->signature == MagickSignature);
 374   if (image->debug != MagickFalse)
 375     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 376   assert(exception != (ExceptionInfo *) NULL);
 377   assert(exception->signature == MagickSignature);
 378   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 379   if (status == MagickFalse)
 380     return(status);
 381   if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
 382     (void) TransformImageColorspace(image,sRGBColorspace,exception);
 383   /*
 384     Convert image to a bi-level image.
 385   */
 386   (void) SetImageType(image,BilevelType,exception);
 387   (void) WriteBlobMSBShort(image,0);
 388   WBMPWriteInteger(image,image->columns);
 389   WBMPWriteInteger(image,image->rows);
 390   for (y=0; y < (ssize_t) image->rows; y++)
 391   {
 392     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 393     if (p == (const Quantum *) NULL)
 394       break;
 395     bit=0;
 396     byte=0;
 397     for (x=0; x < (ssize_t) image->columns; x++)
 398     {
 399       if (GetPixelIntensity(image,p) >= ((double) QuantumRange/2.0))
 400         byte|=0x1 << (7-bit);
 401       bit++;
 402       if (bit == 8)
 403         {
 404           (void) WriteBlobByte(image,byte);
 405           bit=0;
 406           byte=0;
 407         }
 408       p+=GetPixelChannels(image);
 409     }
 410     if (bit != 0)
 411       (void) WriteBlobByte(image,byte);
 412     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 413       image->rows);
 414     if (status == MagickFalse)
 415       break;
 416   }
 417   (void) CloseBlob(image);
 418   return(MagickTrue);
 419 }