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Diffstat (limited to 'backend/plustek-pp_scale.c')
| -rw-r--r-- | backend/plustek-pp_scale.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/backend/plustek-pp_scale.c b/backend/plustek-pp_scale.c new file mode 100644 index 0000000..295a566 --- /dev/null +++ b/backend/plustek-pp_scale.c @@ -0,0 +1,149 @@ +/* @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 ...................................................*/ |