/usr/include/graphviz/gvplugin.h is in libgraphviz-dev 2.36.0-0ubuntu3.
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/
*************************************************************************/
/* Header used by plugins */
#ifndef GVPLUGIN_H
#define GVPLUGIN_H
#ifdef __cplusplus
extern "C" {
#endif
#include "gvcext.h"
/*
* Terminology:
*
* package - e.g. libgvplugin_cairo.so
* api - e.g. render
* type - e.g. "png", "ps"
*/
typedef struct {
int id; /* an id that is only unique within a package
of plugins of the same api.
A renderer-type such as "png" in the cairo package
has an id that is different from the "ps" type
in the same package */
const char *type; /* a string name, such as "png" or "ps" that
distinguishes different types withing the same
(renderer in this case) */
int quality; /* an arbitrary integer used for ordering plugins of
the same type from different packages */
void *engine; /* pointer to the jump table for the plugin */
void *features; /* pointer to the feature description
void* because type varies by api */
} gvplugin_installed_t;
typedef struct {
api_t api;
gvplugin_installed_t *types;
} gvplugin_api_t;
typedef struct {
char *packagename; /* used when this plugin is builtin and has
no pathname */
gvplugin_api_t *apis;
} gvplugin_library_t;
#ifdef __cplusplus
}
#endif
#endif /* GVPLUGIN_H */
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