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authorJörg Frings-Fürst <debian@jff-webhosting.net>2014-10-06 14:00:40 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2014-10-06 14:00:40 +0200
commit6e9c41a892ed0e0da326e0278b3221ce3f5713b8 (patch)
tree2e301d871bbeeb44aa57ff9cc070fcf3be484487 /backend/plustek-pp_scale.c
Initial import of sane-backends version 1.0.24-1.2
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diff --git a/backend/plustek-pp_scale.c b/backend/plustek-pp_scale.c
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+/* @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 ...................................................*/