sane-project-backends/backend/mustek_pp.h

/* sane - Scanner Access Now Easy.
   Copyright (C) 2000-2003 Jochen Eisinger <jochen.eisinger@gmx.net>
   This file is part of the SANE package.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA.

   As a special exception, the authors of SANE give permission for
   additional uses of the libraries contained in this release of SANE.

   The exception is that, if you link a SANE library with other files
   to produce an executable, this does not by itself cause the
   resulting executable to be covered by the GNU General Public
   License.  Your use of that executable is in no way restricted on
   account of linking the SANE library code into it.

   This exception does not, however, invalidate any other reasons why
   the executable file might be covered by the GNU General Public
   License.

   If you submit changes to SANE to the maintainers to be included in
   a subsequent release, you agree by submitting the changes that
   those changes may be distributed with this exception intact.

   If you write modifications of your own for SANE, it is your choice
   whether to permit this exception to apply to your modifications.
   If you do not wish that, delete this exception notice.  */

#ifndef mustek_pp_h
#define mustek_pp_h

#if defined(HAVE_SYS_TYPES_H)
# include <sys/types.h>
#endif
#if defined(HAVE_SYS_TIME_H)
# include <sys/time.h>
#endif
   
#define DEBUG_NOT_STATIC
#include "../include/sane/sanei_debug.h"

/* Please note: ASSERT won't go away if you define NDEBUG, it just won't
 * output a message when ASSERT failes. So if "cond" does anything, it will
 * be executed, even if NDEBUG is defined... 
 */
#define	ASSERT(cond, retval)	do { 					\
				if (!(cond)) { 				\
					DBG(2, "assertion %s failed\n",	\
					STRINGIFY(cond));		\
					if (retval >= 0)		\
						return retval;		\
					else				\
						return;			\
				}					\
				}

/* This macro uses a otherwise unused argument */
#if defined(__GNUC__)
# define __UNUSED__	__attribute__ ((unused))
#else
# define __UNUSED__
#endif


/* the function init uses this callback to register a device to the backend */
typedef SANE_Status (*SANE_Attach_Callback) (SANE_String_Const port, SANE_String_Const name,
						SANE_Int driver, SANE_Int info);

typedef struct {

	const char		*driver;
	const char		*author;
	const char		*version;

	/* this function detects the presence of a scanner at the
	 * given location */
	SANE_Status		(*init)(SANE_Int options,
					SANE_String_Const port,
					SANE_String_Const name,
					SANE_Attach_Callback attach);
	/* this function returns the informationen needed to set up
	 * the device entry. the info parameter is passed from
	 * init to the attach_callback to this function, to
	 * help to identify the device, before it is registered
	 */
	void			(*capabilities)(SANE_Int info,
						SANE_String *model,
						SANE_String *vendor,
						SANE_String *type,
						SANE_Int *maxres,
						SANE_Int *minres,
						SANE_Int *maxhsize,
						SANE_Int *maxvsize,
						SANE_Int *caps);

	/* tries to open the given device. returns a fd on success */
	SANE_Status		(*open)(SANE_String port, SANE_Int caps, SANE_Int *fd);

	/* start scanning session */
	void			(*setup)(SANE_Handle hndl);

        /* processes a configuration option */
        SANE_Status		(*config)(SANE_Handle hndl, 
					  SANE_String_Const optname,
                                          SANE_String_Const optval);

	/* stop scanning session */
	void			(*close)(SANE_Handle hndl);

	/* start actuall scan */
	SANE_Status		(*start)(SANE_Handle hndl);

	/* read data (one line) */
	void			(*read)(SANE_Handle hndl, SANE_Byte *buffer);

	/* stop scanner and return scanhead home */
	void			(*stop)(SANE_Handle hndl);

} Mustek_pp_Functions;

/* Drivers */



#define MUSTEK_PP_NUM_DRIVERS	((int)(sizeof(Mustek_pp_Drivers) / \
				sizeof(Mustek_pp_Functions)))

#define	CAP_NOTHING		0
#define CAP_GAMMA_CORRECT	1
#define CAP_INVERT		2
#define	CAP_SPEED_SELECT	4
#define CAP_LAMP_OFF		8
#define CAP_TA			16
#define CAP_DEPTH		32

/* Structure for holding name/value options from the configuration file */
typedef struct Mustek_pp_config_option {

   SANE_String name;
   SANE_String value;
   
} Mustek_pp_config_option;

typedef struct Mustek_pp_Device {

	struct Mustek_pp_Device	*next;

	SANE_Device		sane;

	/* non-const copy of SANE_Device */
	SANE_String		name, vendor, model, type;

	/* port */
	SANE_String		port;

	/* part describing hardware capabilities */
	int			minres;
	int			maxres;
	int			maxhsize;
	int			maxvsize;
	int			caps;

	/* functions */
	Mustek_pp_Functions	*func;
        
        /* Modified by EDG: device identification is needed to initialize
           private device descriptor */
        SANE_Int 		info;
        
        /* Array of configuration file options */
        int			numcfgoptions;
        Mustek_pp_config_option *cfgoptions;

} Mustek_pp_Device;

#define STATE_IDLE		0
#define	STATE_CANCELLED		1
#define STATE_SCANNING		2

#define MODE_BW			0
#define MODE_GRAYSCALE		1
#define MODE_COLOR		2

#define SPEED_SLOWEST		0
#define SPEED_SLOWER		1
#define SPEED_NORMAL		2
#define SPEED_FASTER		3
#define SPEED_FASTEST		4


enum Mustek_pp_Option
{
  OPT_NUM_OPTS = 0,

  OPT_MODE_GROUP,
  OPT_MODE,
  OPT_DEPTH,
  OPT_RESOLUTION,
  OPT_PREVIEW,
  OPT_GRAY_PREVIEW,
  OPT_SPEED,

  OPT_GEOMETRY_GROUP,
  OPT_TL_X,			/* top-left x */
  OPT_TL_Y,			/* top-left y */
  OPT_BR_X,			/* bottom-right x */
  OPT_BR_Y,			/* bottom-right y */

  OPT_ENHANCEMENT_GROUP,


  OPT_INVERT,

  OPT_CUSTOM_GAMMA,		/* use custom gamma tables? */
  /* The gamma vectors MUST appear in the order gray, red, green,
     blue.  */
  OPT_GAMMA_VECTOR,
  OPT_GAMMA_VECTOR_R,
  OPT_GAMMA_VECTOR_G,
  OPT_GAMMA_VECTOR_B,

  /* must come last: */
  NUM_OPTIONS
};

typedef union
{
  SANE_Word w;
  SANE_Word *wa;		/* word array */
  SANE_String s;
}
Option_Value;


typedef struct Mustek_pp_Handle {

	struct Mustek_pp_Handle	*next;

	
	
	Mustek_pp_Device	*dev;

	int			fd;

	int			reader;
	int			pipe;

	int			state;
	
	int			topX, topY;
	int			bottomX, bottomY;
	int			mode;
	int			res;

	/* gamma table, etc... */
	SANE_Int		gamma_table[4][256];
	int			do_gamma;
	int			invert;
	int			use_ta;
	int			depth;
	int			speed;
	
	/* current parameters */
	SANE_Parameters params;

	SANE_Range dpi_range;
	SANE_Range x_range;
	SANE_Range y_range;
	SANE_Range gamma_range;
  
	/* options */
	SANE_Option_Descriptor	opt[NUM_OPTIONS];
	Option_Value		val[NUM_OPTIONS];


	time_t			lamp_on;

	void			*priv;
	
} Mustek_pp_Handle;

#endif /* mustek_pp_h */