gvplugin.h

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/*************************************************************************
 * 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
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/
 
/* Header used by plugins */
 
#pragma once
 
#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 within 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