/usr/include/graphviz/gvc.h is in libgraphviz-dev 2.36.0-0ubuntu3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/* vim:set shiftwidth=4 ts=8: */
/*************************************************************************
* Copyright (c) 2011 AT&T Intellectual Property
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors: See CVS logs. Details at http://www.graphviz.org/
*************************************************************************/
#ifndef GVC_H
#define GVC_H
#include "types.h"
#include "gvplugin.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifdef GVDLL
#define extern __declspec(dllexport)
#else
#define extern
#endif
/*visual studio*/
#ifdef WIN32_DLL
#ifndef GVC_EXPORTS
#define extern __declspec(dllimport)
#endif
#endif
/*end visual studio*/
/* misc */
/* FIXME - this needs eliminating or renaming */
extern void gvToggle(int);
/* set up a graphviz context */
extern GVC_t *gvNEWcontext(const lt_symlist_t *builtins, int demand_loading);
/* set up a graphviz context - and init graph - retaining old API */
extern GVC_t *gvContext(void);
/* set up a graphviz context - and init graph - with builtins */
extern GVC_t *gvContextPlugins(const lt_symlist_t *builtins, int demand_loading);
/* get information associated with a graphviz context */
extern char **gvcInfo(GVC_t*);
extern char *gvcVersion(GVC_t*);
extern char *gvcBuildDate(GVC_t*);
/* parse command line args - minimally argv[0] sets layout engine */
extern int gvParseArgs(GVC_t *gvc, int argc, char **argv);
extern graph_t *gvNextInputGraph(GVC_t *gvc);
extern graph_t *gvPluginsGraph(GVC_t *gvc);
/* Compute a layout using a specified engine */
extern int gvLayout(GVC_t *gvc, graph_t *g, const char *engine);
/* Compute a layout using layout engine from command line args */
extern int gvLayoutJobs(GVC_t *gvc, graph_t *g);
/* Render layout into string attributes of the graph */
extern void attach_attrs(graph_t *g);
/* Render layout in a specified format to an open FILE */
extern int gvRender(GVC_t *gvc, graph_t *g, const char *format, FILE *out);
/* Render layout in a specified format to an open FILE */
extern int gvRenderFilename(GVC_t *gvc, graph_t *g, const char *format, const char *filename);
/* Render layout in a specified format to an external context */
extern int gvRenderContext(GVC_t *gvc, graph_t *g, const char *format, void *context);
/* Render layout in a specified format to a malloc'ed string */
extern int gvRenderData(GVC_t *gvc, graph_t *g, const char *format, char **result, unsigned int *length);
/* Free memory allocated and pointed to by *result in gvRenderData */
extern void gvFreeRenderData (char* data);
/* Render layout according to -T and -o options found by gvParseArgs */
extern int gvRenderJobs(GVC_t *gvc, graph_t *g);
/* Clean up layout data structures - layouts are not nestable (yet) */
extern int gvFreeLayout(GVC_t *gvc, graph_t *g);
/* Clean up graphviz context */
extern void gvFinalize(GVC_t *gvc);
extern int gvFreeContext(GVC_t *gvc);
/* Return list of plugins of type kind.
* kind would normally be "render" "layout" "textlayout" "device" "loadimage"
* The size of the list is stored in sz.
* The caller is responsible for freeing the storage. This involves
* freeing each item, then the list.
* Returns NULL on error, or if there are no plugins.
* In the former case, sz is unchanged; in the latter, sz = 0.
*
* At present, the str argument is unused, but may be used to modify
* the search as in gvplugin_list above.
*/
extern char** gvPluginList (GVC_t *gvc, char* kind, int* sz, char*);
/** Add a library from your user application
* @param gvc Graphviz context to add library to
* @param lib library to add
*/
extern void gvAddLibrary(GVC_t *gvc, gvplugin_library_t *lib);
#undef extern
#ifdef __cplusplus
}
#endif
#endif /* GVC_H */
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