kopia lustrzana https://gitlab.com/sane-project/backends
150 wiersze
4.0 KiB
C
150 wiersze
4.0 KiB
C
/* @file plustek-pp_scale.c
|
|
* @brief Scaling functionality
|
|
*
|
|
* Copyright (C) 2000-2004 Gerhard Jaeger <gerhard@gjaeger.de>
|
|
*
|
|
* History:
|
|
* - 0.32 - initial version
|
|
* - 0.33 - no changes
|
|
* - 0.34 - no changes
|
|
* - 0.35 - no changes
|
|
* - 0.36 - no changes
|
|
* - 0.37 - no changes
|
|
* - 0.38 - no changes
|
|
* - 0.39 - no changes
|
|
* - 0.40 - no changes
|
|
* - 0.41 - no changes
|
|
* - 0.42 - 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, 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>
|
|
*/
|
|
#include "plustek-pp_scan.h"
|
|
|
|
/************************ exported functions *********************************/
|
|
|
|
/** scaling picture data in x-direction, using a DDA algo
|
|
* (digital differential analyzer).
|
|
*/
|
|
_LOC void ScaleX( pScanData ps, pUChar inBuf, pUChar outBuf )
|
|
{
|
|
UChar tmp;
|
|
int step;
|
|
int izoom;
|
|
int ddax;
|
|
register ULong i, j, x;
|
|
|
|
#ifdef DEBUG
|
|
_VAR_NOT_USED( dbg_level );
|
|
#endif
|
|
|
|
/* scale... */
|
|
izoom = (int)(1000000/ps->DataInf.XYRatio);
|
|
|
|
switch( ps->DataInf.wAppDataType ) {
|
|
|
|
case COLOR_BW : step = 0; break;
|
|
case COLOR_HALFTONE: step = 0; break;
|
|
case COLOR_256GRAY : step = 1; break;
|
|
case COLOR_TRUE24 : step = 3; break; /*NOTE: COLOR_TRUE32 is the same !*/
|
|
case COLOR_TRUE48 : step = 6; break;
|
|
default : step = 99; break;
|
|
}
|
|
|
|
/* when not supported, only copy the data
|
|
*/
|
|
if( 99 == step ) {
|
|
memcpy( outBuf, inBuf, ps->DataInf.dwAppBytesPerLine );
|
|
return;
|
|
}
|
|
|
|
/* now scale...
|
|
*/
|
|
ddax = 0;
|
|
x = 0;
|
|
if( 0 == step ) {
|
|
|
|
/* binary scaling
|
|
*/
|
|
memset( outBuf, 0, ps->DataInf.dwAppBytesPerLine );
|
|
|
|
for( i = 0; i < ps->DataInf.dwPhysBytesPerLine*8; i++ ) {
|
|
|
|
ddax -= 1000;
|
|
|
|
while( ddax < 0 ) {
|
|
|
|
tmp = inBuf[(i>>3)];
|
|
|
|
if((x>>3) < ps->DataInf.dwAppBytesPerLine ) {
|
|
if( 0 != (tmp &= (1 << ((~(i & 0x7))&0x7))))
|
|
outBuf[x>>3] |= (1 << ((~(x & 0x7))&0x7));
|
|
}
|
|
x++;
|
|
ddax += izoom;
|
|
}
|
|
}
|
|
|
|
} else {
|
|
|
|
/* color and gray scaling
|
|
*/
|
|
for( i = 0; i < ps->DataInf.dwPhysBytesPerLine*step; i+=step ) {
|
|
|
|
ddax -= 1000;
|
|
|
|
while( ddax < 0 ) {
|
|
|
|
for( j = 0; j < (ULong)step; j++ ) {
|
|
|
|
if((x+j) < ps->DataInf.dwAppBytesPerLine ) {
|
|
outBuf[x+j] = inBuf[i+j];
|
|
}
|
|
}
|
|
x += step;
|
|
ddax += izoom;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* END PLUSTEK-PP_SCALE.C ...................................................*/
|