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/*.............................................................................
* Project : SANE library for Plustek flatbed scanners.
*.............................................................................
*/
/** @file plustek-usbmap.c
* @brief Creating and manipulating lookup tables.
*
* Based on sources acquired from Plustek Inc.<br>
* Copyright (C) 2001-2007 Gerhard Jaeger <gerhard@gjaeger.de>
*
* History:
* - 0.40 - starting version of the USB support
* - 0.41 - fixed brightness problem for lineart mode
* - 0.42 - removed preset of linear gamma tables
* - 0.43 - no changes
* - 0.44 - map inversion for negatatives now only upon user request
* - 0.45 - no changes
* - 0.46 - no changes
* - 0.47 - cleanup work
* - 0.48 - added support for binary from color scans
* - 0.49 - changed usb_MapDownload
* - 0.50 - cleanup
* - 0.51 - no changes
* - 0.52 - no changes
* .
* <hr>
* 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, see <https://www.gnu.org/licenses/>.
*
* 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.
* <hr>
*/
#define _MAP_SIZE 4096
static SANE_Byte a_bMap[_MAP_SIZE * 3];
/** adjust according to brightness and contrast
*/
static void usb_MapAdjust( Plustek_Device *dev )
{
int i, tabLen;
double b, c, tmp;
tabLen = _MAP_SIZE;
/* adjust brightness (b) and contrast (c) using the function:
*
* s(x,y) = (s(x,y) + b) * c
* b = [-127, 127]
* c = [0,2]
*/
b = ((double)dev->scanning.sParam.brightness * 192.0)/100.0;
c = ((double)dev->scanning.sParam.contrast + 100.0)/100.0;
DBG( _DBG_INFO, "* brightness = %i -> %i\n",
dev->scanning.sParam.brightness, (u_char)b);
DBG( _DBG_INFO, "* contrast = %i -> %.3f\n",
dev->scanning.sParam.contrast, c);
if( dev->scanning.sParam.brightness == 0 && dev->scanning.sParam.contrast )
return;
for( i = 0; i < tabLen; i++ ) {
tmp = ((double)(a_bMap[i] + b)) * c;
if( tmp < 0 ) tmp = 0;
if( tmp > 255 ) tmp = 255;
a_bMap[i] = (u_char)tmp;
tmp = ((double)(a_bMap[tabLen+i] + b)) * c;
if( tmp < 0 ) tmp = 0;
if( tmp > 255 ) tmp = 255;
a_bMap[tabLen+i] = (u_char)tmp;
tmp = ((double)(a_bMap[tabLen*2+i] + b)) * c;
if( tmp < 0 ) tmp = 0;
if( tmp > 255 ) tmp = 255;
a_bMap[tabLen*2+i] = (u_char)tmp;
}
}
/**
*/
static SANE_Bool usb_MapDownload( Plustek_Device *dev )
{
ScanDef *scanning = &dev->scanning;
DCapsDef *sc = &dev->usbDev.Caps;
int color;
int i, threshold;
SANE_Byte value;
SANE_Bool fInverse = 0;
DBG( _DBG_INFO, "usb_MapDownload()\n" );
/* the maps are have been already set */
/* do the brightness and contrast adjustment ... */
if( scanning->sParam.bDataType != SCANDATATYPE_BW )
usb_MapAdjust( dev );
if( !usbio_WriteReg( dev->fd, 7, 0))
return SANE_FALSE;
/* we download all the time all three color maps, as we run
* into trouble elsewhere on CanoScan models using gray mode
*/
for( color = 0; color < 3; color++) {
/* select color */
value = (color << 2)+2;
/* set gamma color selector */
usbio_WriteReg( dev->fd, 0x03, value );
usbio_WriteReg( dev->fd, 0x04, 0 );
usbio_WriteReg( dev->fd, 0x05, 0 );
/* write the gamma table entry to merlin */
if((scanning->sParam.bDataType == SCANDATATYPE_BW) ||
(scanning->fGrayFromColor > 7 )) {
threshold = (int)((double)scanning->sParam.brightness *
(_MAP_SIZE/200.0)) + (_MAP_SIZE/2);
threshold = _MAP_SIZE - threshold;
if(threshold < 0)
threshold = 0;
if(threshold > (int)_MAP_SIZE)
threshold = _MAP_SIZE;
DBG(_DBG_INFO, "* Threshold is at %u brightness=%i\n",
threshold, scanning->sParam.brightness );
for(i = 0; i < threshold; i++)
a_bMap[color*_MAP_SIZE + i] = 0;
for(i = threshold; i < _MAP_SIZE; i++)
a_bMap[color*_MAP_SIZE + i] = 255;
fInverse = 1;
} else {
fInverse = 0;
}
if( /*scanning->dwFlag & SCANFLAG_Pseudo48 && */
(scanning->sParam.bSource == SOURCE_Negative) &&
(sc->workaroundFlag &_WAF_INV_NEGATIVE_MAP)) {
fInverse ^= 1;
}
if( fInverse ) {
u_char map[_MAP_SIZE];
u_char *pMap = a_bMap+color*_MAP_SIZE;
DBG( _DBG_INFO, "* Inverting Map\n" );
for( i = 0; i < _MAP_SIZE; i++, pMap++ )
map[i] = ~*pMap;
sanei_lm983x_write( dev->fd, 0x06, map, _MAP_SIZE, SANE_FALSE );
} else {
DBG( _DBG_INFO, "* downloading map %u...\n", color );
sanei_lm983x_write( dev->fd, 0x06, a_bMap+color*_MAP_SIZE,
_MAP_SIZE, SANE_FALSE );
}
} /* for each color */
DBG( _DBG_INFO, "usb_MapDownload() done.\n" );
return SANE_TRUE;
}
/* END PLUSTEK-USBMAP.C .....................................................*/
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