kopia lustrzana https://gitlab.com/sane-project/backends
209 wiersze
6.1 KiB
C
209 wiersze
6.1 KiB
C
/*.............................................................................
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* Project : SANE library for Plustek flatbed scanners.
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*.............................................................................
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*/
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/** @file plustek-usbmap.c
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* @brief Creating and manipulating lookup tables.
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*
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* Based on sources acquired from Plustek Inc.<br>
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* Copyright (C) 2001-2007 Gerhard Jaeger <gerhard@gjaeger.de>
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*
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* History:
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* - 0.40 - starting version of the USB support
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* - 0.41 - fixed brightness problem for lineart mode
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* - 0.42 - removed preset of linear gamma tables
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* - 0.43 - no changes
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* - 0.44 - map inversion for negatatives now only upon user request
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* - 0.45 - no changes
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* - 0.46 - no changes
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* - 0.47 - cleanup work
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* - 0.48 - added support for binary from color scans
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* - 0.49 - changed usb_MapDownload
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* - 0.50 - cleanup
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* - 0.51 - no changes
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* - 0.52 - no changes
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* .
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* <hr>
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* This file is part of the SANE package.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* As a special exception, the authors of SANE give permission for
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* additional uses of the libraries contained in this release of SANE.
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*
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* The exception is that, if you link a SANE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public
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* License. Your use of that executable is in no way restricted on
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* account of linking the SANE library code into it.
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*
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* This exception does not, however, invalidate any other reasons why
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* the executable file might be covered by the GNU General Public
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* License.
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*
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* If you submit changes to SANE to the maintainers to be included in
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* a subsequent release, you agree by submitting the changes that
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* those changes may be distributed with this exception intact.
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*
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* If you write modifications of your own for SANE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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* <hr>
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*/
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#define _MAP_SIZE 4096
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static SANE_Byte a_bMap[_MAP_SIZE * 3];
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/** adjust according to brightness and contrast
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*/
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static void usb_MapAdjust( Plustek_Device *dev )
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{
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int i, tabLen;
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double b, c, tmp;
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tabLen = _MAP_SIZE;
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/* adjust brightness (b) and contrast (c) using the function:
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*
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* s(x,y) = (s(x,y) + b) * c
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* b = [-127, 127]
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* c = [0,2]
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*/
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b = ((double)dev->scanning.sParam.brightness * 192.0)/100.0;
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c = ((double)dev->scanning.sParam.contrast + 100.0)/100.0;
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DBG( _DBG_INFO, "* brightness = %i -> %i\n",
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dev->scanning.sParam.brightness, (u_char)b);
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DBG( _DBG_INFO, "* contrast = %i -> %.3f\n",
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dev->scanning.sParam.contrast, c);
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if( dev->scanning.sParam.brightness == 0 && dev->scanning.sParam.contrast )
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return;
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for( i = 0; i < tabLen; i++ ) {
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tmp = ((double)(a_bMap[i] + b)) * c;
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if( tmp < 0 ) tmp = 0;
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if( tmp > 255 ) tmp = 255;
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a_bMap[i] = (u_char)tmp;
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tmp = ((double)(a_bMap[tabLen+i] + b)) * c;
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if( tmp < 0 ) tmp = 0;
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if( tmp > 255 ) tmp = 255;
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a_bMap[tabLen+i] = (u_char)tmp;
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tmp = ((double)(a_bMap[tabLen*2+i] + b)) * c;
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if( tmp < 0 ) tmp = 0;
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if( tmp > 255 ) tmp = 255;
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a_bMap[tabLen*2+i] = (u_char)tmp;
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}
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}
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/**
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*/
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static SANE_Bool usb_MapDownload( Plustek_Device *dev )
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{
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ScanDef *scanning = &dev->scanning;
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DCapsDef *sc = &dev->usbDev.Caps;
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int color;
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int i, threshold;
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SANE_Byte value;
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SANE_Bool fInverse = 0;
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DBG( _DBG_INFO, "usb_MapDownload()\n" );
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/* the maps are have been already set */
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/* do the brightness and contrast adjustment ... */
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if( scanning->sParam.bDataType != SCANDATATYPE_BW )
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usb_MapAdjust( dev );
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if( !usbio_WriteReg( dev->fd, 7, 0))
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return SANE_FALSE;
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/* we download all the time all three color maps, as we run
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* into trouble elsewhere on CanoScan models using gray mode
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*/
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for( color = 0; color < 3; color++) {
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/* select color */
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value = (color << 2)+2;
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/* set gamma color selector */
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usbio_WriteReg( dev->fd, 0x03, value );
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usbio_WriteReg( dev->fd, 0x04, 0 );
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usbio_WriteReg( dev->fd, 0x05, 0 );
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/* write the gamma table entry to merlin */
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if((scanning->sParam.bDataType == SCANDATATYPE_BW) ||
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(scanning->fGrayFromColor > 7 )) {
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threshold = (int)((double)scanning->sParam.brightness *
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(_MAP_SIZE/200.0)) + (_MAP_SIZE/2);
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threshold = _MAP_SIZE - threshold;
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if(threshold < 0)
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threshold = 0;
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if(threshold > (int)_MAP_SIZE)
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threshold = _MAP_SIZE;
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DBG(_DBG_INFO, "* Threshold is at %u brightness=%i\n",
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threshold, scanning->sParam.brightness );
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for(i = 0; i < threshold; i++)
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a_bMap[color*_MAP_SIZE + i] = 0;
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for(i = threshold; i < _MAP_SIZE; i++)
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a_bMap[color*_MAP_SIZE + i] = 255;
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fInverse = 1;
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} else {
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fInverse = 0;
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}
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if( /*scanning->dwFlag & SCANFLAG_Pseudo48 && */
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(scanning->sParam.bSource == SOURCE_Negative) &&
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(sc->workaroundFlag &_WAF_INV_NEGATIVE_MAP)) {
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fInverse ^= 1;
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}
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if( fInverse ) {
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u_char map[_MAP_SIZE];
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u_char *pMap = a_bMap+color*_MAP_SIZE;
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DBG( _DBG_INFO, "* Inverting Map\n" );
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for( i = 0; i < _MAP_SIZE; i++, pMap++ )
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map[i] = ~*pMap;
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sanei_lm983x_write( dev->fd, 0x06, map, _MAP_SIZE, SANE_FALSE );
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} else {
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DBG( _DBG_INFO, "* downloading map %u...\n", color );
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sanei_lm983x_write( dev->fd, 0x06, a_bMap+color*_MAP_SIZE,
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_MAP_SIZE, SANE_FALSE );
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}
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} /* for each color */
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DBG( _DBG_INFO, "usb_MapDownload() done.\n" );
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return SANE_TRUE;
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}
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/* END PLUSTEK-USBMAP.C .....................................................*/
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