text: /*
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %                                                                             %
  %                                                                             %
  %                                                                             %
  %                            DDDD    OOO   TTTTT                              %
  %                            D   D  O   O    T                                %
  %                            D   D  O   O    T                                %
  %                            D   D  O   O    T                                %
  %                            DDDD    OOO     T                                %
  %                                                                             %
  %                                                                             %
  %                      Read/Write Graphviz DOT Format                         %
  %                                                                             %
  %                              Software Design                                %
  %                                   Cristy                                    %
  %                                 July 1992                                   %
  %                                                                             %
  %                                                                             %
  %  Copyright 1999-2020 ImageMagick Studio LLC, a non-profit organization      %
  %  dedicated to making software imaging solutions freely available.           %
  %                                                                             %
  %  You may not use this file except in compliance with the License.  You may  %
  %  obtain a copy of the License at                                            %
  %                                                                             %
  %    https://imagemagick.org/script/license.php                               %
  %                                                                             %
  %  Unless required by applicable law or agreed to in writing, software        %
  %  distributed under the License is distributed on an "AS IS" BASIS,          %
  %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  %  See the License for the specific language governing permissions and        %
  %  limitations under the License.                                             %
  %                                                                             %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  %
  */
  
  /*
    Include declarations.
  */
  #include "MagickCore/studio.h"
  #include "MagickCore/blob.h"
  #include "MagickCore/blob-private.h"
  #include "MagickCore/client.h"
  #include "MagickCore/constitute.h"
  #include "MagickCore/exception.h"
  #include "MagickCore/exception-private.h"
  #include "MagickCore/image.h"
  #include "MagickCore/image-private.h"
  #include "MagickCore/list.h"
  #include "MagickCore/magick.h"
  #include "MagickCore/memory_.h"
  #include "MagickCore/monitor.h"
  #include "MagickCore/monitor-private.h"
  #include "MagickCore/option.h"
  #include "MagickCore/resource_.h"
  #include "MagickCore/quantum-private.h"
  #include "MagickCore/static.h"
  #include "MagickCore/string_.h"
  #include "MagickCore/module.h"
  #include "MagickCore/utility.h"
  #include "MagickCore/xwindow-private.h"
  #if defined(MAGICKCORE_GVC_DELEGATE)
  #undef HAVE_CONFIG_H
  #include <gvc.h>
  static GVC_t
    *graphic_context = (GVC_t *) NULL;
  #endif
  
  #if defined(MAGICKCORE_GVC_DELEGATE)
  /*
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %                                                                             %
  %                                                                             %
  %                                                                             %
  %   R e a d D O T I m a g e                                                   %
  %                                                                             %
  %                                                                             %
  %                                                                             %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  %  ReadDOTImage() reads a Graphviz image file and returns it.  It allocates
  %  the memory necessary for the new Image structure and returns a pointer to
  %  the new image.
  %
  %  The format of the ReadDOTImage method is:
  %
  %      Image *ReadDOTImage(const ImageInfo *image_info,ExceptionInfo *exception)
  %
  %  A description of each parameter follows:
  %
  %    o image_info: the image info.
  %
  %    o exception: return any errors or warnings in this structure.
  %
  */
  static Image *ReadDOTImage(const ImageInfo *image_info,ExceptionInfo *exception)
  {
    char
      command[MagickPathExtent];
  
    const char
      *option;
  
    graph_t
      *graph;
  
    Image
      *image;
  
    ImageInfo
      *read_info;
  
    MagickBooleanType
      status;
  
    /*
      Open image file.
    */
    assert(image_info != (const ImageInfo *) NULL);
    assert(image_info->signature == MagickCoreSignature);
    if (image_info->debug != MagickFalse)
      (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
        image_info->filename);
    assert(exception != (ExceptionInfo *) NULL);
    assert(exception->signature == MagickCoreSignature);
    assert(graphic_context != (GVC_t *) NULL);
    image=AcquireImage(image_info,exception);
    status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
    if (status == MagickFalse)
      return(DestroyImageList(image));
    read_info=CloneImageInfo(image_info);
    SetImageInfoBlob(read_info,(void *) NULL,0);
    (void) CopyMagickString(read_info->magick,"SVG",MagickPathExtent);
    (void) AcquireUniqueFilename(read_info->filename);
    (void) FormatLocaleString(command,MagickPathExtent,"-Tsvg -o%s %s",
      read_info->filename,image_info->filename);
  #if !defined(WITH_CGRAPH)
    graph=agread(GetBlobFileHandle(image));
  #else
    graph=agread(GetBlobFileHandle(image),(Agdisc_t *) NULL);
  #endif
    if (graph == (graph_t *) NULL)
      {
        (void) RelinquishUniqueFileResource(read_info->filename);
        return(DestroyImageList(image));
      }
    option=GetImageOption(image_info,"dot:layout-engine");
    if (option == (const char *) NULL)
      gvLayout(graphic_context,graph,(char *) "dot");
    else
      gvLayout(graphic_context,graph,(char *) option);
    gvRenderFilename(graphic_context,graph,(char *) "svg",read_info->filename);
    gvFreeLayout(graphic_context,graph);
    agclose(graph);
    image=DestroyImageList(image);
    /*
      Read SVG graph.
    */
    (void) CopyMagickString(read_info->magick,"SVG",MaxTextExtent);
    image=ReadImage(read_info,exception);
    (void) RelinquishUniqueFileResource(read_info->filename);
    read_info=DestroyImageInfo(read_info);
    if (image == (Image *) NULL)
      return((Image *) NULL);
    return(GetFirstImageInList(image));
  }
  #endif
  
  /*
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %                                                                             %
  %                                                                             %
  %                                                                             %
  %   R e g i s t e r D O T I m a g e                                           %
  %                                                                             %
  %                                                                             %
  %                                                                             %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  %  RegisterDOTImage() adds attributes for the Display Postscript image
  %  format to the list of supported formats.  The attributes include the image
  %  format tag, a method to read and/or write the format, whether the format
  %  supports the saving of more than one frame to the same file or blob,
  %  whether the format supports native in-memory I/O, and a brief
  %  description of the format.
  %
  %  The format of the RegisterDOTImage method is:
  %
  %      size_t RegisterDOTImage(void)
  %
  */
  ModuleExport size_t RegisterDOTImage(void)
  {
    MagickInfo
      *entry;
  
    entry=AcquireMagickInfo("DOT","DOT","Graphviz");
  #if defined(MAGICKCORE_GVC_DELEGATE)
    entry->decoder=(DecodeImageHandler *) ReadDOTImage;
  #endif
    entry->flags^=CoderBlobSupportFlag;
    (void) RegisterMagickInfo(entry);
    entry=AcquireMagickInfo("DOT","GV","Graphviz");
  #if defined(MAGICKCORE_GVC_DELEGATE)
    entry->decoder=(DecodeImageHandler *) ReadDOTImage;
  #endif
    entry->flags^=CoderBlobSupportFlag;
    (void) RegisterMagickInfo(entry);
  #if defined(MAGICKCORE_GVC_DELEGATE)
    graphic_context=gvContext();
  #endif
    return(MagickImageCoderSignature);
  }
  
  /*
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %                                                                             %
  %                                                                             %
  %                                                                             %
  %   U n r e g i s t e r D O T I m a g e                                       %
  %                                                                             %
  %                                                                             %
  %                                                                             %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  %  UnregisterDOTImage() removes format registrations made by the
  %  DOT module from the list of supported formats.
  %
  %  The format of the UnregisterDOTImage method is:
  %
  %      UnregisterDOTImage(void)
  %
  */
  ModuleExport void UnregisterDOTImage(void)
  {
    (void) UnregisterMagickInfo("GV");
    (void) UnregisterMagickInfo("DOT");
  #if defined(MAGICKCORE_GVC_DELEGATE)
    if (graphic_context != (GVC_t *) NULL)
      {
        gvFreeContext(graphic_context);
        graphic_context=(GVC_t *) NULL;
      }
  #endif
  }
  