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