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sane-project-backends/backend/plustek-pp_map.c

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/* @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 <gerhard@gjaeger.de>
* 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
* .
* <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>
*/
#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 .....................................................*/
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