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 1999-2011 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 /*
  39   Include declarations.
  40 */
  41 #include "MagickCore/studio.h"
  42 #include "MagickCore/blob.h"
  43 #include "MagickCore/blob-private.h"
  44 #include "MagickCore/cache.h"
  45 #include "MagickCore/color-private.h"
  46 #include "MagickCore/colormap.h"
  47 #include "MagickCore/colorspace.h"
  48 #include "MagickCore/colorspace-private.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   WriteWBMPImage(const ImageInfo *,Image *,ExceptionInfo *);
  69 \f
  70 /*
  71 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  72 %                                                                             %
  73 %                                                                             %
  74 %                                                                             %
  75 %   R e a d W B M P I m a g e                                                 %
  76 %                                                                             %
  77 %                                                                             %
  78 %                                                                             %
  79 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  80 %
  81 %  ReadWBMPImage() reads a WBMP (level 0) image file and returns it.  It
  82 %  allocates the memory necessary for the new Image structure and returns a
  83 %  pointer to the new image.
  84 %
  85 %  ReadWBMPImage was contributed by Milan Votava <votava@mageo.cz>.
  86 %
  87 %  The format of the ReadWBMPImage method is:
  88 %
  89 %      Image *ReadWBMPImage(const ImageInfo *image_info,
  90 %        ExceptionInfo *exception)
  91 %
  92 %  A description of each parameter follows:
  93 %
  94 %    o image_info: the image info.
  95 %
  96 %    o exception: return any errors or warnings in this structure.
  97 %
  98 */
  99
 100 static MagickBooleanType WBMPReadInteger(Image *image,size_t *value)
 101 {
 102   int
 103     byte;
 104
 105   *value=0;
 106   do
 107   {
 108     byte=ReadBlobByte(image);
 109     if (byte == EOF)
 110       return(MagickFalse);
 111     *value<<=7;
 112     *value|=(unsigned int) (byte & 0x7f);
 113   } while (byte & 0x80);
 114   return(MagickTrue);
 115 }
 116
 117 static Image *ReadWBMPImage(const ImageInfo *image_info,
 118   ExceptionInfo *exception)
 119 {
 120   Image
 121     *image;
 122
 123   int
 124     byte;
 125
 126   MagickBooleanType
 127     status;
 128
 129   register ssize_t
 130     x;
 131
 132   register Quantum
 133     *q;
 134
 135   ssize_t
 136     y;
 137
 138   unsigned char
 139     bit;
 140
 141   unsigned short
 142     header;
 143
 144   /*
 145     Open image file.
 146   */
 147   assert(image_info != (const ImageInfo *) NULL);
 148   assert(image_info->signature == MagickSignature);
 149   if (image_info->debug != MagickFalse)
 150     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 151       image_info->filename);
 152   assert(exception != (ExceptionInfo *) NULL);
 153   assert(exception->signature == MagickSignature);
 154   image=AcquireImage(image_info);
 155   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 156   if (status == MagickFalse)
 157     {
 158       image=DestroyImageList(image);
 159       return((Image *) NULL);
 160     }
 161   if (ReadBlob(image,2,(unsigned char *) &header) == 0)
 162     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 163   if (header != 0)
 164     ThrowReaderException(CoderError,"OnlyLevelZerofilesSupported");
 165   /*
 166     Initialize image structure.
 167   */
 168   if (WBMPReadInteger(image,&image->columns) == MagickFalse)
 169     ThrowReaderException(CorruptImageError,"CorruptWBMPimage");
 170   if (WBMPReadInteger(image,&image->rows) == MagickFalse)
 171     ThrowReaderException(CorruptImageError,"CorruptWBMPimage");
 172   if ((image->columns == 0) || (image->rows == 0))
 173     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 174   if (DiscardBlobBytes(image,image->offset) == MagickFalse)
 175     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 176       image->filename);
 177   if (AcquireImageColormap(image,2,exception) == MagickFalse)
 178     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 179   if (image_info->ping != MagickFalse)
 180     {
 181       (void) CloseBlob(image);
 182       return(GetFirstImageInList(image));
 183     }
 184   /*
 185     Convert bi-level image to pixel packets.
 186   */
 187   for (y=0; y < (ssize_t) image->rows; y++)
 188   {
 189     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 190     if (q == (Quantum *) NULL)
 191       break;
 192     bit=0;
 193     byte=0;
 194     for (x=0; x < (ssize_t) image->columns; x++)
 195     {
 196       if (bit == 0)
 197         {
 198           byte=ReadBlobByte(image);
 199           if (byte == EOF)
 200             ThrowReaderException(CorruptImageError,"CorruptImage");
 201         }
 202       SetPixelIndex(image,(byte & (0x01 << (7-bit))) ? 1 : 0,q);
 203       bit++;
 204       if (bit == 8)
 205         bit=0;
 206       q+=GetPixelChannels(image);
 207     }
 208     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 209       break;
 210     status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 211                 image->rows);
 212     if (status == MagickFalse)
 213       break;
 214   }
 215   (void) SyncImage(image);
 216   if (EOFBlob(image) != MagickFalse)
 217     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 218       image->filename);
 219   (void) CloseBlob(image);
 220   return(GetFirstImageInList(image));
 221 }
 222 \f
 223 /*
 224 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 225 %                                                                             %
 226 %                                                                             %
 227 %                                                                             %
 228 %   R e g i s t e r W B M P I m a g e                                         %
 229 %                                                                             %
 230 %                                                                             %
 231 %                                                                             %
 232 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 233 %
 234 %  RegisterWBMPImage() adds attributes for the WBMP image format to
 235 %  the list of supported formats.  The attributes include the image format
 236 %  tag, a method to read and/or write the format, whether the format
 237 %  supports the saving of more than one frame to the same file or blob,
 238 %  whether the format supports native in-memory I/O, and a brief
 239 %  description of the format.
 240 %
 241 %  The format of the RegisterWBMPImage method is:
 242 %
 243 %      size_t RegisterWBMPImage(void)
 244 %
 245 */
 246 ModuleExport size_t RegisterWBMPImage(void)
 247 {
 248   MagickInfo
 249     *entry;
 250
 251   entry=SetMagickInfo("WBMP");
 252   entry->decoder=(DecodeImageHandler *) ReadWBMPImage;
 253   entry->encoder=(EncodeImageHandler *) WriteWBMPImage;
 254   entry->adjoin=MagickFalse;
 255   entry->description=ConstantString("Wireless Bitmap (level 0) image");
 256   entry->module=ConstantString("WBMP");
 257   (void) RegisterMagickInfo(entry);
 258   return(MagickImageCoderSignature);
 259 }
 260 \f
 261 /*
 262 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 263 %                                                                             %
 264 %                                                                             %
 265 %                                                                             %
 266 %   U n r e g i s t e r W B M P I m a g e                                     %
 267 %                                                                             %
 268 %                                                                             %
 269 %                                                                             %
 270 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 271 %
 272 %  UnregisterWBMPImage() removes format registrations made by the
 273 %  WBMP module from the list of supported formats.
 274 %
 275 %  The format of the UnregisterWBMPImage method is:
 276 %
 277 %      UnregisterWBMPImage(void)
 278 %
 279 */
 280 ModuleExport void UnregisterWBMPImage(void)
 281 {
 282   (void) UnregisterMagickInfo("WBMP");
 283 }
 284 \f
 285 /*
 286 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 287 %                                                                             %
 288 %                                                                             %
 289 %                                                                             %
 290 %   W r i t e W B M P I m a g e                                               %
 291 %                                                                             %
 292 %                                                                             %
 293 %                                                                             %
 294 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 295 %
 296 %  WriteWBMPImage() writes an image to a file in the Wireless Bitmap
 297 %  (level 0) image format.
 298 %
 299 %  WriteWBMPImage was contributed by Milan Votava <votava@mageo.cz>.
 300 %
 301 %  The format of the WriteWBMPImage method is:
 302 %
 303 %      MagickBooleanType WriteWBMPImage(const ImageInfo *image_info,
 304 %        Image *image,ExceptionInfo *exception)
 305 %
 306 %  A description of each parameter follows.
 307 %
 308 %    o image_info: the image info.
 309 %
 310 %    o image:  The image.
 311 %
 312 %    o exception: return any errors or warnings in this structure.
 313 %
 314 */
 315
 316 static void WBMPWriteInteger(Image *image,const size_t value)
 317 {
 318   int
 319     bits,
 320     flag,
 321     n;
 322
 323   register ssize_t
 324     i;
 325
 326   unsigned char
 327     buffer[5],
 328     octet;
 329
 330   n=1;
 331   bits=28;
 332   flag=MagickFalse;
 333   for (i=4; i >= 0; i--)
 334   {
 335     octet=(unsigned char) ((value >> bits) & 0x7f);
 336     if ((flag == 0) && (octet != 0))
 337       {
 338         flag=MagickTrue;
 339         n=i+1;
 340       }
 341     buffer[4-i]=octet | (i && (flag || octet))*(0x01 << 7);
 342     bits-=7;
 343   }
 344   (void) WriteBlob(image,(size_t) n,buffer+5-n);
 345 }
 346
 347 static MagickBooleanType WriteWBMPImage(const ImageInfo *image_info,
 348   Image *image,ExceptionInfo *exception)
 349 {
 350   MagickBooleanType
 351     status;
 352
 353   register const Quantum
 354     *p;
 355
 356   register ssize_t
 357     x;
 358
 359   ssize_t
 360     y;
 361
 362   unsigned char
 363     bit,
 364     byte;
 365
 366   /*
 367     Open output image file.
 368   */
 369   assert(image_info != (const ImageInfo *) NULL);
 370   assert(image_info->signature == MagickSignature);
 371   assert(image != (Image *) NULL);
 372   assert(image->signature == MagickSignature);
 373   if (image->debug != MagickFalse)
 374     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 375   assert(exception != (ExceptionInfo *) NULL);
 376   assert(exception->signature == MagickSignature);
 377   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 378   if (status == MagickFalse)
 379     return(status);
 380   if (IsRGBColorspace(image->colorspace) == MagickFalse)
 381     (void) TransformImageColorspace(image,RGBColorspace);
 382   /*
 383     Convert image to a bi-level image.
 384   */
 385   (void) SetImageType(image,BilevelType,exception);
 386   (void) WriteBlobMSBShort(image,0);
 387   WBMPWriteInteger(image,image->columns);
 388   WBMPWriteInteger(image,image->rows);
 389   for (y=0; y < (ssize_t) image->rows; y++)
 390   {
 391     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 392     if (p == (const Quantum *) NULL)
 393       break;
 394     bit=0;
 395     byte=0;
 396     for (x=0; x < (ssize_t) image->columns; x++)
 397     {
 398       if (GetPixelIntensity(image,p) >= ((MagickRealType) QuantumRange/2.0))
 399         byte|=0x1 << (7-bit);
 400       bit++;
 401       if (bit == 8)
 402         {
 403           (void) WriteBlobByte(image,byte);
 404           bit=0;
 405           byte=0;
 406         }
 407       p+=GetPixelChannels(image);
 408     }
 409     if (bit != 0)
 410       (void) WriteBlobByte(image,byte);
 411     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 412       image->rows);
 413     if (status == MagickFalse)
 414       break;
 415   }
 416   (void) CloseBlob(image);
 417   return(MagickTrue);
 418 }