/* Portions Copyright (C) 1994-1996, Russell Lang.  
   Portions Copyright (C) 2001 artofcode LLC.
   Portions Copyright (C) 1996, 2001 Artifex Software Inc.
   Portions Copyright (C) 1988, 2000 Aladdin Enterprises.
   This software is based in part on the work of the Independent JPEG Group.
   All Rights Reserved.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/ or
   contact Artifex Software, Inc., 101 Lucas Valley Road #110,
   San Rafael, CA  94903, (415)492-9861, for further information. */

/*$RCSfile: gsdll.h,v $ $Revision: 1.10 $ */

#ifndef gsdll_INCLUDED
#  define gsdll_INCLUDED

#include "iapi.h"

#ifdef __MACOS__
#define HWND char *
#include <QDOffscreen.h>
#pragma export on
#endif

#ifdef __WINDOWS__
#define _Windows
#endif

#ifdef __IBMC__
#define GSDLLCALLLINK _System
#else
#define GSDLLCALLLINK
#endif

/* global pointer to callback */
typedef int (* GSDLLCALLLINK GSDLL_CALLBACK) (int, char *, unsigned long);
extern GSDLL_CALLBACK pgsdll_callback;

/* message values for callback */
#define GSDLL_STDIN 1		/* get count characters to str from stdin */
			/* return number of characters read */
#define GSDLL_STDOUT 2		/* put count characters from str to stdout */
			/* return number of characters written */
#define GSDLL_DEVICE 3		/* device = str has been opened if count=1 */
			/*                    or closed if count=0 */
#define GSDLL_SYNC 4		/* sync_output for device str */
#define GSDLL_PAGE 5		/* output_page for device str */
#define GSDLL_SIZE 6		/* resize for device str */
			/* LOWORD(count) is new xsize */
			/* HIWORD(count) is new ysize */
#define GSDLL_POLL 7		/* Called from gp_check_interrupt */
			/* Can be used by caller to poll the message queue */
			/* Normally returns 0 */
			/* To abort gsdll_execute_cont(), return a */
			/* non zero error code until gsdll_execute_cont() */
			/* returns */

/* return values from gsdll_init() */
#define GSDLL_INIT_IN_USE  100	/* DLL is in use */
#define GSDLL_INIT_QUIT    101	/* quit or EOF during init */
				  /* This is not an error. */
				  /* gsdll_exit() must not be called */


/* DLL exported  functions */
/* for load time dynamic linking */
GSDLLEXPORT int GSDLLAPI gsdll_revision(const char * * product, const char * * copyright, long * gs_revision, long * gs_revisiondate);
GSDLLEXPORT int GSDLLAPI gsdll_init(GSDLL_CALLBACK callback, HWND hwnd, int argc, char * * argv);
GSDLLEXPORT int GSDLLAPI gsdll_execute_begin(void);
GSDLLEXPORT int GSDLLAPI gsdll_execute_cont(const char * str, int len);
GSDLLEXPORT int GSDLLAPI gsdll_execute_end(void);
GSDLLEXPORT int GSDLLAPI gsdll_exit(void);
GSDLLEXPORT int GSDLLAPI gsdll_lock_device(unsigned char *device, int flag);

/* Function pointer typedefs */
/* for run time dynamic linking */
typedef int (GSDLLAPIPTR PFN_gsdll_revision)(const char ** product, 
    const char ** copyright, long * revision, long * revisiondate);
typedef int (GSDLLAPIPTR PFN_gsdll_init) (GSDLL_CALLBACK, HWND, int argc, char * * argv);
typedef int (GSDLLAPIPTR PFN_gsdll_execute_begin) (void);
typedef int (GSDLLAPIPTR PFN_gsdll_execute_cont) (const char * str, int len);
typedef int (GSDLLAPIPTR PFN_gsdll_execute_end) (void);
typedef int (GSDLLAPIPTR PFN_gsdll_exit) (void);
typedef int (GSDLLAPIPTR PFN_gsdll_lock_device) (unsigned char *, int);

#ifdef __MACOS__
#pragma export off
#endif

#endif /* gsdll_INCLUDED */
