openjpeg/libopenjpeg/event.h

/*
 * Copyright (c) 2005, Herv<EFBFBD> Drolon, FreeImage Team
 * Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef __EVENT_H
#define __EVENT_H

#include "openjpeg.h"

/**
@file event.h
@brief Implementation of a event callback system

The functions in EVENT.C have for goal to send output messages (errors, warnings, debug) to the user.
*/
/**
Message handler object
used for 
<ul>
<li>Error messages
<li>Warning messages
<li>Debugging messages
</ul>
*/
typedef struct opj_event_mgr 
{
	/** Data to call the event manager upon */
	void *			m_error_data;
	/** Data to call the event manager upon */
	void *			m_warning_data;
	/** Data to call the event manager upon */
	void *			m_info_data;
	/** Error message callback if available, NULL otherwise */
	opj_msg_callback error_handler;
	/** Warning message callback if available, NULL otherwise */
	opj_msg_callback warning_handler;
	/** Debug message callback if available, NULL otherwise */
	opj_msg_callback info_handler;
} opj_event_mgr_t;

#define EVT_ERROR	1	/**< Error event type */
#define EVT_WARNING	2	/**< Warning event type */
#define EVT_INFO	4	/**< Debug event type */

/** @defgroup EVENT EVENT - Implementation of a event callback system */
/*@{*/

/** @name Exported functions (see also openjpeg.h) */
/*@{*/
/* ----------------------------------------------------------------------- */
/**
 * Writes formatted data to a string and send the string to a user callback. 
 * @param p_event_mgr the event manager to display messages.
 * @param event_type Event type of the message
 * @param fmt Format-control string (plus optionnal arguments)
 * @return Returns true if successful, returns false otherwise
*/
bool opj_event_msg(struct opj_event_mgr * p_event_mgr, OPJ_INT32 event_type, const OPJ_CHAR *fmt, ...);
/* ----------------------------------------------------------------------- */
/*@}*/

/*@}*/

#endif /* __EVENT_H */