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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            DDDD    OOO   TTTTT                              %
   7 %                            D   D  O   O    T                                %
   8 %                            D   D  O   O    T                                %
   9 %                            D   D  O   O    T                                %
  10 %                            DDDD    OOO     T                                %
  11 %                                                                             %
  12 %                                                                             %
  13 %                      Read/Write Graphviz DOT Format                         %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2018 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 %    https://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/client.h"
  46 #include "MagickCore/constitute.h"
  47 #include "MagickCore/exception.h"
  48 #include "MagickCore/exception-private.h"
  49 #include "MagickCore/image.h"
  50 #include "MagickCore/image-private.h"
  51 #include "MagickCore/list.h"
  52 #include "MagickCore/magick.h"
  53 #include "MagickCore/memory_.h"
  54 #include "MagickCore/monitor.h"
  55 #include "MagickCore/monitor-private.h"
  56 #include "MagickCore/option.h"
  57 #include "MagickCore/resource_.h"
  58 #include "MagickCore/quantum-private.h"
  59 #include "MagickCore/static.h"
  60 #include "MagickCore/string_.h"
  61 #include "MagickCore/module.h"
  62 #include "MagickCore/utility.h"
  63 #include "MagickCore/xwindow-private.h"
  64 #if defined(MAGICKCORE_GVC_DELEGATE)
  65 #undef HAVE_CONFIG_H
  66 #include <gvc.h>
  67 static GVC_t
  68   *graphic_context = (GVC_t *) NULL;
  69 #endif
  70 \f
  71 #if defined(MAGICKCORE_GVC_DELEGATE)
  72 /*
  73 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  74 %                                                                             %
  75 %                                                                             %
  76 %                                                                             %
  77 %   R e a d D O T I m a g e                                                   %
  78 %                                                                             %
  79 %                                                                             %
  80 %                                                                             %
  81 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  82 %
  83 %  ReadDOTImage() reads a Graphviz image file and returns it.  It allocates
  84 %  the memory necessary for the new Image structure and returns a pointer to
  85 %  the new image.
  86 %
  87 %  The format of the ReadDOTImage method is:
  88 %
  89 %      Image *ReadDOTImage(const ImageInfo *image_info,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 *ReadDOTImage(const ImageInfo *image_info,ExceptionInfo *exception)
  99 {
 100   char
 101     command[MagickPathExtent];
 102
 103   const char
 104     *option;
 105
 106   graph_t
 107     *graph;
 108
 109   Image
 110     *image;
 111
 112   ImageInfo
 113     *read_info;
 114
 115   MagickBooleanType
 116     status;
 117
 118   /*
 119     Open image file.
 120   */
 121   assert(image_info != (const ImageInfo *) NULL);
 122   assert(image_info->signature == MagickCoreSignature);
 123   if (image_info->debug != MagickFalse)
 124     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 125       image_info->filename);
 126   assert(exception != (ExceptionInfo *) NULL);
 127   assert(exception->signature == MagickCoreSignature);
 128   assert(graphic_context != (GVC_t *) NULL);
 129   image=AcquireImage(image_info,exception);
 130   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 131   if (status == MagickFalse)
 132     return((Image *) NULL);
 133   read_info=CloneImageInfo(image_info);
 134   SetImageInfoBlob(read_info,(void *) NULL,0);
 135   (void) CopyMagickString(read_info->magick,"SVG",MagickPathExtent);
 136   (void) AcquireUniqueFilename(read_info->filename);
 137   (void) FormatLocaleString(command,MagickPathExtent,"-Tsvg -o%s %s",
 138     read_info->filename,image_info->filename);
 139 #if !defined(WITH_CGRAPH)
 140   graph=agread(GetBlobFileHandle(image));
 141 #else
 142   graph=agread(GetBlobFileHandle(image),(Agdisc_t *) NULL);
 143 #endif
 144   if (graph == (graph_t *) NULL)
 145     {
 146       (void) RelinquishUniqueFileResource(read_info->filename);
 147       return ((Image *) NULL);
 148     }
 149   option=GetImageOption(image_info,"dot:layout-engine");
 150   if (option == (const char *) NULL)
 151     gvLayout(graphic_context,graph,(char *) "dot");
 152   else
 153     gvLayout(graphic_context,graph,(char *) option);
 154   gvRenderFilename(graphic_context,graph,(char *) "svg",read_info->filename);
 155   gvFreeLayout(graphic_context,graph);
 156   agclose(graph);
 157   /*
 158     Read SVG graph.
 159   */
 160   image=ReadImage(read_info,exception);
 161   (void) RelinquishUniqueFileResource(read_info->filename);
 162   read_info=DestroyImageInfo(read_info);
 163   if (image == (Image *) NULL)
 164     return((Image *) NULL);
 165   return(GetFirstImageInList(image));
 166 }
 167 #endif
 168 \f
 169 /*
 170 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 171 %                                                                             %
 172 %                                                                             %
 173 %                                                                             %
 174 %   R e g i s t e r D O T I m a g e                                           %
 175 %                                                                             %
 176 %                                                                             %
 177 %                                                                             %
 178 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 179 %
 180 %  RegisterDOTImage() adds attributes for the Display Postscript image
 181 %  format to the list of supported formats.  The attributes include the image
 182 %  format tag, a method to read and/or write the format, whether the format
 183 %  supports the saving of more than one frame to the same file or blob,
 184 %  whether the format supports native in-memory I/O, and a brief
 185 %  description of the format.
 186 %
 187 %  The format of the RegisterDOTImage method is:
 188 %
 189 %      size_t RegisterDOTImage(void)
 190 %
 191 */
 192 ModuleExport size_t RegisterDOTImage(void)
 193 {
 194   MagickInfo
 195     *entry;
 196
 197   entry=AcquireMagickInfo("DOT","DOT","Graphviz");
 198 #if defined(MAGICKCORE_GVC_DELEGATE)
 199   entry->decoder=(DecodeImageHandler *) ReadDOTImage;
 200 #endif
 201   entry->flags^=CoderBlobSupportFlag;
 202   (void) RegisterMagickInfo(entry);
 203   entry=AcquireMagickInfo("DOT","GV","Graphviz");
 204 #if defined(MAGICKCORE_GVC_DELEGATE)
 205   entry->decoder=(DecodeImageHandler *) ReadDOTImage;
 206 #endif
 207   entry->flags^=CoderBlobSupportFlag;
 208   (void) RegisterMagickInfo(entry);
 209 #if defined(MAGICKCORE_GVC_DELEGATE)
 210   graphic_context=gvContext();
 211 #endif
 212   return(MagickImageCoderSignature);
 213 }
 214 \f
 215 /*
 216 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 217 %                                                                             %
 218 %                                                                             %
 219 %                                                                             %
 220 %   U n r e g i s t e r D O T I m a g e                                       %
 221 %                                                                             %
 222 %                                                                             %
 223 %                                                                             %
 224 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 225 %
 226 %  UnregisterDOTImage() removes format registrations made by the
 227 %  DOT module from the list of supported formats.
 228 %
 229 %  The format of the UnregisterDOTImage method is:
 230 %
 231 %      UnregisterDOTImage(void)
 232 %
 233 */
 234 ModuleExport void UnregisterDOTImage(void)
 235 {
 236   (void) UnregisterMagickInfo("GV");
 237   (void) UnregisterMagickInfo("DOT");
 238 #if defined(MAGICKCORE_GVC_DELEGATE)
 239   if (graphic_context != (GVC_t *) NULL)
 240     {
 241       gvFreeContext(graphic_context);
 242       graphic_context=(GVC_t *) NULL;
 243     }
 244 #endif
 245 }