Initial import of sane-backends version 1.0.24-1.2

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 ...................................................*/