/* @file plustek-pp_map.c * @brief functions to create and manipulate lookup tables. * * based on sources acquired from Plustek Inc. * Copyright (C) 1998 Plustek Inc. * Copyright (C) 2000-2004 Gerhard Jaeger * also based on the work done by Rick Bronson * * History: * - 0.30 - initial version * - 0.31 - brightness and contrast is working (see mapAdjust) * - 0.32 - no changes * - 0.33 - disabled a few functions * - 0.34 - added new dither matrix for checking * - 0.35 - no changes * - 0.36 - activated Dithermap 1 * - removed some unused functions * - added additional SCANDEF_Inverse check to MapSetupDither() * - fixed the double inversion bug, the map always compensates * - the scanner hw-settings * - 0.37 - code cleanup * - 0.38 - added P12 stuff * - 0.39 - no changes * - 0.40 - no changes * - 0.41 - no changes * - 0.42 - made MapAdjust global * - changed include names * - 0.43 - cleanup, removed floating point stuff * . *
* 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 . * * 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. *
*/ #include "plustek-pp_scan.h" /*************************** local vars **************************************/ /*WORK: * create other thresholds for the dither maps */ static Byte mapDitherMatrix0[_DITHERSIZE] = { 0, 32, 8, 40, 2, 34, 10, 42, 48, 16, 56, 24, 50, 18, 58, 26, 12, 44, 4, 36, 14, 46, 6, 38, 60, 28, 52, 20, 62, 30, 54, 22, 3, 35, 11, 43, 1, 33, 9, 41, 51, 19, 59, 27, 49, 17, 57, 25, 15, 47, 7, 39, 13, 45, 5, 37, 63, 31, 55, 23, 61, 29, 53, 21 }; static Byte mapDitherMatrix1[_DITHERSIZE] = { 2, 60, 16, 56, 3, 57, 13, 53, 34, 18, 48, 32, 35, 19, 45, 29, 10, 50, 6, 63, 11, 51, 7, 61, 42, 26, 38, 22, 43, 27, 39, 23, 4, 58, 14, 54, 1, 59, 15, 55, 36, 20, 46, 30, 33, 17, 47, 31, 12, 52, 8, 62, 9, 49, 5, 63, 44, 28, 40, 24, 41, 25, 37, 21 }; /*************************** local functions *********************************/ /** set the selected dither maps... */ static void mapSetDitherMap( pScanData ps ) { ULong i; pUChar pDitherSource; pUChar pDither = ps->a_bDitherPattern; if( 0 == ps->DataInf.wDither ) { DBG( DBG_LOW, "Using Dithermatrix 0\n" ); pDitherSource = mapDitherMatrix0; } else { DBG( DBG_LOW, "Using Dithermatrix 1\n" ); pDitherSource = mapDitherMatrix1; } for( i = 0; i < _DITHERSIZE; i++ ) { pDither[i] = pDitherSource[i]; } } /** nothing more to say */ static void mapInvertMap( pScanData ps ) { pULong pdw; ULong dw, size; DBG( DBG_LOW, "mapInvertMap()\n" ); if( _IS_ASIC98(ps->sCaps.AsicID)) { size = 4096; } else { size = 256; } for (pdw = (pULong)ps->a_bMapTable, dw = size * 3 / 4; dw; dw--, pdw++) { *pdw = ~(*pdw); } } /** as the name says... */ static void mapInvertDitherMap( pScanData ps ) { if( ps->DataInf.dwScanFlag & SCANDEF_Inverse ) { ULong dw; pULong pDither = (pULong)ps->a_bDitherPattern; DBG( DBG_LOW, "mapInvertDitherMap()\n" ); mapInvertMap( ps ); for (dw = 0; dw < 16; dw++) { pDither[dw] = ~pDither[dw]; } } } /** build linear map... */ static void mapBuildLinearMap( pScanData ps ) { ULong i; DBG( DBG_LOW, "mapBuildLinearMap()\n" ); if( _IS_ASIC98(ps->sCaps.AsicID)) { for( i = 0; i < 4096; i++ ) { ps->a_bMapTable[i] = (UChar)(i >> 4); ps->a_bMapTable[4096+i] = (UChar)(i >> 4); ps->a_bMapTable[8192+i] = (UChar)(i >> 4); } } else { for( i = 0; i < 256; i++ ) { ps->a_bMapTable[i] = (UChar)(i & 0xff); ps->a_bMapTable[256+i] = (UChar)(i & 0xff); ps->a_bMapTable[512+i] = (UChar)(i & 0xff); } } } /************************ exported functions *********************************/ /** create a mapping table * in the original code this map will be created by the TWAIN application * and the is being downloaded to the driver, as I don't have the code * we have to try to build up such a table here */ _LOC void MapInitialize( pScanData ps ) { mapBuildLinearMap( ps ); MapAdjust( ps, _MAP_MASTER ); } /** setup dither maps */ _LOC void MapSetupDither( pScanData ps ) { DBG( DBG_LOW, "MapSetupDither() - %u\n", ps->DataInf.wAppDataType ); if( COLOR_HALFTONE == ps->DataInf.wAppDataType ) { mapSetDitherMap( ps ); if (ps->DataInf.dwScanFlag & SCANDEF_Inverse) mapInvertDitherMap( ps ); } } /** adjust according to brightness and contrast */ _LOC void MapAdjust( pScanData ps, int which ) { ULong i, tabLen, dw; ULong *pdw; long b, c, tmp; DBG( DBG_LOW, "MapAdjust(%u)\n", which ); if( _IS_ASIC98(ps->sCaps.AsicID)) { tabLen = 4096; } else { tabLen = 256; } /* adjust brightness (b) and contrast (c) using the function: * s'(x,y) = (s(x,y) + b) * c * b = [-127, 127] * c = [0,2] */ /* scale brightness and contrast... */ b = ps->wBrightness * 192; c = ps->wContrast + 100; DBG( DBG_LOW, "brightness = %i -> %i\n", ps->wBrightness, (UChar)(b/100)); DBG( DBG_LOW, "contrast*100 = %i -> %i\n", ps->wContrast, (int)(c)); for( i = 0; i < tabLen; i++ ) { if((_MAP_MASTER == which) || (_MAP_RED == which)) { tmp = ((((long)ps->a_bMapTable[i] * 100) + b) *c ) / 10000; if( tmp < 0 ) tmp = 0; if( tmp > 255 ) tmp = 255; ps->a_bMapTable[i] = (UChar)tmp; } if((_MAP_MASTER == which) || (_MAP_GREEN == which)) { tmp = ((((long)ps->a_bMapTable[tabLen+i] * 100) + b) * c) / 10000; if( tmp < 0 ) tmp = 0; if( tmp > 255 ) tmp = 255; ps->a_bMapTable[tabLen+i] = (UChar)tmp; } if((_MAP_MASTER == which) || (_MAP_BLUE == which)) { tmp = ((((long)ps->a_bMapTable[tabLen*2+i] * 100) + b) * c) / 10000; if( tmp < 0 ) tmp = 0; if( tmp > 255 ) tmp = 255; ps->a_bMapTable[tabLen*2+i] = (UChar)tmp; } } if( ps->DataInf.dwScanFlag & SCANDEF_Negative ) { DBG( DBG_LOW, "inverting...\n" ); if((_MAP_MASTER == which) || (_MAP_RED == which)) { DBG( DBG_LOW, "inverting RED map\n" ); pdw = (pULong)ps->a_bMapTable; for( dw = tabLen / 4; dw; dw--, pdw++ ) *pdw = ~(*pdw); } if((_MAP_MASTER == which) || (_MAP_GREEN == which)) { DBG( DBG_LOW, "inverting GREEN map\n" ); pdw = (pULong)&ps->a_bMapTable[tabLen]; for( dw = tabLen / 4; dw; dw--, pdw++ ) *pdw = ~(*pdw); } if((_MAP_MASTER == which) || (_MAP_BLUE == which)) { DBG( DBG_LOW, "inverting BLUE map\n" ); pdw = (pULong)&ps->a_bMapTable[tabLen*2]; for( dw = tabLen / 4; dw; dw--, pdw++ ) *pdw = ~(*pdw); } } } /* END PLUSTEK-PP_MAP.C .....................................................*/