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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            H   H  RRRR   ZZZZZ                              %
   7 %                            H   H  R   R     ZZ                              %
   8 %                            HHHHH  RRRR     Z                                %
   9 %                            H   H  R R    ZZ                                 %
  10 %                            H   H  R  R   ZZZZZ                              %
  11 %                                                                             %
  12 %                                                                             %
  13 %                Read/Write Slow Scan TeleVision Image 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/colorspace.h"
  47 #include "magick/exception.h"
  48 #include "magick/exception-private.h"
  49 #include "magick/image.h"
  50 #include "magick/image-private.h"
  51 #include "magick/list.h"
  52 #include "magick/magick.h"
  53 #include "magick/memory_.h"
  54 #include "magick/monitor.h"
  55 #include "magick/monitor-private.h"
  56 #include "magick/quantum-private.h"
  57 #include "magick/static.h"
  58 #include "magick/string_.h"
  59 #include "magick/module.h"
  60 \f
  61 /*
  62   Forward declarations.
  63 */
  64 static MagickBooleanType
  65   WriteHRZImage(const ImageInfo *,Image *);
  66 \f
  67 /*
  68 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  69 %                                                                             %
  70 %                                                                             %
  71 %                                                                             %
  72 %   R e a d H R Z I m a g e                                                   %
  73 %                                                                             %
  74 %                                                                             %
  75 %                                                                             %
  76 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  77 %
  78 %  ReadHRZImage() reads a Slow Scan TeleVision image file and returns it.  It
  79 %  allocates the memory necessary for the new Image structure and returns a
  80 %  pointer to the new image.
  81 %
  82 %  The format of the ReadHRZImage method is:
  83 %
  84 %      Image *ReadHRZImage(const ImageInfo *image_info,ExceptionInfo *exception)
  85 %
  86 %  A description of each parameter follows:
  87 %
  88 %    o image_info: the image info.
  89 %
  90 %    o exception: return any errors or warnings in this structure.
  91 %
  92 */
  93 static Image *ReadHRZImage(const ImageInfo *image_info,ExceptionInfo *exception)
  94 {
  95   Image
  96     *image;
  97
  98   ssize_t
  99     y;
 100
 101   MagickBooleanType
 102     status;
 103
 104   register ssize_t
 105     x;
 106
 107   register PixelPacket
 108     *q;
 109
 110   register unsigned char
 111     *p;
 112
 113   ssize_t
 114     count;
 115
 116   size_t
 117     length;
 118
 119   unsigned char
 120     *pixels;
 121
 122   /*
 123     Open image file.
 124   */
 125   assert(image_info != (const ImageInfo *) NULL);
 126   assert(image_info->signature == MagickSignature);
 127   if (image_info->debug != MagickFalse)
 128     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 129       image_info->filename);
 130   assert(exception != (ExceptionInfo *) NULL);
 131   assert(exception->signature == MagickSignature);
 132   image=AcquireImage(image_info);
 133   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 134   if (status == MagickFalse)
 135     {
 136       image=DestroyImageList(image);
 137       return((Image *) NULL);
 138     }
 139   /*
 140     Convert HRZ raster image to pixel packets.
 141   */
 142   image->columns=256;
 143   image->rows=240;
 144   image->depth=8;
 145   pixels=(unsigned char *) AcquireQuantumMemory(image->columns,
 146     3*sizeof(*pixels));
 147   if (pixels == (unsigned char *) NULL)
 148     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 149   length=(size_t) (3*image->columns);
 150   for (y=0; y < (ssize_t) image->rows; y++)
 151   {
 152     count=ReadBlob(image,length,pixels);
 153     if ((size_t) count != length)
 154       ThrowReaderException(CorruptImageError,"UnableToReadImageData");
 155     p=pixels;
 156     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 157     if (q == (PixelPacket *) NULL)
 158       break;
 159     for (x=0; x < (ssize_t) image->columns; x++)
 160     {
 161       q->red=4*ScaleCharToQuantum(*p++);
 162       q->green=4*ScaleCharToQuantum(*p++);
 163       q->blue=4*ScaleCharToQuantum(*p++);
 164       SetOpacityPixelComponent(q,OpaqueOpacity);
 165       q++;
 166     }
 167     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 168       break;
 169     if (SetImageProgress(image,LoadImageTag,y,image->rows) == MagickFalse)
 170       break;
 171   }
 172   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 173   if (EOFBlob(image) != MagickFalse)
 174     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 175       image->filename);
 176   (void) CloseBlob(image);
 177   return(GetFirstImageInList(image));
 178 }
 179 \f
 180 /*
 181 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 182 %                                                                             %
 183 %                                                                             %
 184 %                                                                             %
 185 %   R e g i s t e r H R Z I m a g e                                           %
 186 %                                                                             %
 187 %                                                                             %
 188 %                                                                             %
 189 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 190 %
 191 %  RegisterHRZImage() adds attributes for the HRZ X image format to the list
 192 %  of supported formats.  The attributes include the image format tag, a
 193 %  method to read and/or write the format, whether the format supports the
 194 %  saving of more than one frame to the same file or blob, whether the format
 195 %  supports native in-memory I/O, and a brief description of the format.
 196 %
 197 %  The format of the RegisterHRZImage method is:
 198 %
 199 %      size_t RegisterHRZImage(void)
 200 %
 201 */
 202 ModuleExport size_t RegisterHRZImage(void)
 203 {
 204   MagickInfo
 205     *entry;
 206
 207   entry=SetMagickInfo("HRZ");
 208   entry->decoder=(DecodeImageHandler *) ReadHRZImage;
 209   entry->encoder=(EncodeImageHandler *) WriteHRZImage;
 210   entry->adjoin=MagickFalse;
 211   entry->description=ConstantString("Slow Scan TeleVision");
 212   entry->module=ConstantString("HRZ");
 213   (void) RegisterMagickInfo(entry);
 214   return(MagickImageCoderSignature);
 215 }
 216 \f
 217 /*
 218 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 219 %                                                                             %
 220 %                                                                             %
 221 %                                                                             %
 222 %   U n r e g i s t e r H R Z I m a g e                                       %
 223 %                                                                             %
 224 %                                                                             %
 225 %                                                                             %
 226 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 227 %
 228 %  UnregisterHRZImage() removes format registrations made by the
 229 %  HRZ module from the list of supported formats.
 230 %
 231 %  The format of the UnregisterHRZImage method is:
 232 %
 233 %      UnregisterHRZImage(void)
 234 %
 235 */
 236 ModuleExport void UnregisterHRZImage(void)
 237 {
 238   (void) UnregisterMagickInfo("HRZ");
 239 }
 240 \f
 241 /*
 242 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 243 %                                                                             %
 244 %                                                                             %
 245 %                                                                             %
 246 %   W r i t e H R Z I m a g e                                                 %
 247 %                                                                             %
 248 %                                                                             %
 249 %                                                                             %
 250 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 251 %
 252 %  WriteHRZImage() writes an image to a file in HRZ X image format.
 253 %
 254 %  The format of the WriteHRZImage method is:
 255 %
 256 %      MagickBooleanType WriteHRZImage(const ImageInfo *image_info,Image *image)
 257 %
 258 %  A description of each parameter follows.
 259 %
 260 %    o image_info: the image info.
 261 %
 262 %    o image:  The image.
 263 %
 264 */
 265 static MagickBooleanType WriteHRZImage(const ImageInfo *image_info,Image *image)
 266 {
 267   Image
 268     *hrz_image;
 269
 270   MagickBooleanType
 271     status;
 272
 273   register const PixelPacket
 274     *p;
 275
 276   register ssize_t
 277     x,
 278     y;
 279
 280   register unsigned char
 281     *q;
 282
 283   ssize_t
 284     count;
 285
 286   unsigned char
 287     *pixels;
 288
 289   /*
 290     Open output image file.
 291   */
 292   assert(image_info != (const ImageInfo *) NULL);
 293   assert(image_info->signature == MagickSignature);
 294   assert(image != (Image *) NULL);
 295   assert(image->signature == MagickSignature);
 296   if (image->debug != MagickFalse)
 297     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 298   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 299   if (status == MagickFalse)
 300     return(status);
 301   hrz_image=ResizeImage(image,256,240,image->filter,image->blur,
 302     &image->exception);
 303   if (hrz_image == (Image *) NULL)
 304     return(MagickFalse);
 305   if (hrz_image->colorspace != RGBColorspace)
 306     (void) TransformImageColorspace(hrz_image,RGBColorspace);
 307   /*
 308     Allocate memory for pixels.
 309   */
 310   pixels=(unsigned char *) AcquireQuantumMemory((size_t) hrz_image->columns,
 311     3*sizeof(*pixels));
 312   if (pixels == (unsigned char *) NULL)
 313     {
 314       hrz_image=DestroyImage(hrz_image);
 315       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 316     }
 317   /*
 318     Convert MIFF to HRZ raster pixels.
 319   */
 320   for (y=0; y < (ssize_t) hrz_image->rows; y++)
 321   {
 322     p=GetVirtualPixels(hrz_image,0,y,hrz_image->columns,1,&image->exception);
 323     if (p == (PixelPacket *) NULL)
 324       break;
 325     q=pixels;
 326     for (x=0; x < (ssize_t) hrz_image->columns; x++)
 327     {
 328       *q++=ScaleQuantumToChar(GetRedPixelComponent(p))/4;
 329       *q++=ScaleQuantumToChar(GetGreenPixelComponent(p))/4;
 330       *q++=ScaleQuantumToChar(GetBluePixelComponent(p))/4;
 331       p++;
 332     }
 333     count=WriteBlob(image,(size_t) (q-pixels),pixels);
 334     if (count != (ssize_t) (q-pixels))
 335       break;
 336     status=SetImageProgress(image,SaveImageTag,y,hrz_image->rows);
 337     if (status == MagickFalse)
 338       break;
 339   }
 340   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 341   hrz_image=DestroyImage(hrz_image);
 342   (void) CloseBlob(image);
 343   return(MagickTrue);
 344 }