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/*
Copyright (C) 2001 Bertrik Sikken (bertrik@zonnet.nl)
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.
$Id$
*/
/*
Core NIASH chip functions.
*/
#ifndef _NIASH_CORE_H_
#define _NIASH_CORE_H_
#include <unistd.h>
#include "niash_xfer.h" /* for EScannerModel */
#define HP3300C_RIGHT 330
#define HP3300C_TOP 452
#define HP3300C_BOTTOM (HP3300C_TOP + 14200UL)
#define HW_PIXELS 5300 /* number of pixels supported by hardware */
#define HW_DPI 600 /* horizontal resolution of hardware */
#define HW_LPI 1200 /* vertical resolution of hardware */
#define BYTES_PER_PIXEL 3
typedef struct
{
int iXferHandle; /* handle used for data transfer to HW */
int iTopLeftX; /* in mm */
int iTopLeftY; /* in mm */
int iSensorSkew; /* in units of 1/1200 inch */
int iSkipLines; /* lines of garbage to skip */
SANE_Bool fReg07; /* NIASH00019 */
SANE_Bool fGamma16; /* if TRUE, gamma entries are 16 bit */
int iExpTime;
SANE_Bool iReversedHead; /* Head is reversed */
int iBufferSize; /* Size of internal scan buffer */
EScannerModel eModel;
} THWParams;
typedef struct
{
int iDpi; /* horizontal resolution */
int iLpi; /* vertical resolution */
int iTop; /* in HW coordinates */
int iLeft; /* in HW coordinates */
int iWidth; /* pixels */
int iHeight; /* lines */
int iBottom;
int fCalib; /* if TRUE, disable backtracking? */
} TScanParams;
typedef struct
{
unsigned char *pabXferBuf; /* transfer buffer */
int iCurLine; /* current line in the transfer buffer */
int iBytesPerLine; /* unsigned chars in one scan line */
int iLinesPerXferBuf; /* number of lines held in the transfer buffer */
int iLinesLeft; /* transfer (down) counter for pabXFerBuf */
int iSaneBytesPerLine; /* how many unsigned chars to be read by SANE per line */
int iScaleDownDpi; /* factors used to emulate lower resolutions */
int iScaleDownLpi; /* than those offered by hardware */
int iSkipLines; /* line to skip at the start of scan */
int iWidth; /* number of pixels expected by SANE */
unsigned char *pabCircBuf; /* circular buffer */
int iLinesPerCircBuf; /* lines held in the circular buffer */
int iRedLine, iGrnLine, /* start indices for the color information */
iBluLine; /* in the circular buffer */
unsigned char *pabLineBuf; /* buffer used to pass data to SANE */
} TDataPipe;
STATIC int NiashOpen (THWParams * pHWParams, const char *pszName);
STATIC void NiashClose (THWParams * pHWParams);
/* more sof. method that also returns the values of the white (RGB) value */
STATIC SANE_Bool SimpleCalibExt (THWParams * pHWPar,
unsigned char *pabCalibTable,
unsigned char *pabCalWhite);
STATIC SANE_Bool GetLamp (THWParams * pHWParams, SANE_Bool * pfLampIsOn);
STATIC SANE_Bool SetLamp (THWParams * pHWParams, SANE_Bool fLampOn);
STATIC SANE_Bool InitScan (TScanParams * pParams, THWParams * pHWParams);
STATIC void FinishScan (THWParams * pHWParams);
STATIC void CalcGamma (unsigned char *pabTable, double Gamma);
STATIC void WriteGammaCalibTable (unsigned char *pabGammaR,
unsigned char *pabGammaG,
unsigned char *pabGammaB,
unsigned char *pabCalibTable, int iGain,
int iOffset, THWParams * pHWPar);
/* set -1 for iHeight to disable all checks on buffer transfers */
/* iWidth is in pixels of SANE */
/* iHeight is lines in scanner resolution */
STATIC void CircBufferInit (int iHandle, TDataPipe * p,
int iWidth, int iHeight,
int iMisAlignment, SANE_Bool iReversedHead,
int iScaleDownDpi, int iScaleDownLpi);
/* returns false, when trying to read after end of buffer */
STATIC SANE_Bool CircBufferGetLine (int iHandle, TDataPipe * p,
unsigned char *pabLine,
SANE_Bool iReversedHead);
/* returns false, when trying to read after end of buffer
if fReturn==SANE_TRUE, the head will return automatically on an end of scan */
STATIC SANE_Bool
CircBufferGetLineEx (int iHandle, TDataPipe * p, unsigned char *pabLine,
SANE_Bool iReversedHead, SANE_Bool fReturn);
STATIC void CircBufferExit (TDataPipe * p);
#endif /* _NIASH_CORE_H_ */
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