diff options
Diffstat (limited to 'backend/plustek-usbmap.c')
| -rw-r--r-- | backend/plustek-usbmap.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/backend/plustek-usbmap.c b/backend/plustek-usbmap.c new file mode 100644 index 0000000..1e54789 --- /dev/null +++ b/backend/plustek-usbmap.c @@ -0,0 +1,210 @@ +/*............................................................................. + * 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, 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. + * <hr> + */ + +#define _MAP_SIZE 4096 + +static SANE_Byte a_bMap[_MAP_SIZE * 3]; + +/** adjust acording 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 .....................................................*/ |