Initial import of sane-backends version 1.0.24-1.2

1 files changed, 192 insertions, 0 deletions

diff --git a/backend/u12-map.c b/backend/u12-map.c
new file mode 100644
index 0000000..7d2f84a
--- /dev/null
+++ b/backend/u12-map.c
@@ -0,0 +1,192 @@
+/* @file u12_map.c
+ * @brief functions to create and manipulate gamma lookup tables.
+ *
+ * Copyright (C) 2003-2004 Gerhard Jaeger <gerhard@gjaeger.de>
+ *
+ * History:
+ * - 0.01 - initial version
+ * - 0.02 - inverting map when scanning binary images
+ *        - changed u12map_Adjust()
+ * .
+ * <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>
+ */
+
+/**
+ * @param  s - pointer to the scanner specific structure
+ * @return The function always returns SANE_STATUS_GOOD
+ */
+static SANE_Status u12map_InitGammaSettings( U12_Device *dev )
+{
+	int    i, j, val;
+	double gamma;
+
+	dev->gamma_length      = 4096;
+	dev->gamma_range.min   = 0;
+	dev->gamma_range.max   = 255;
+	dev->gamma_range.quant = 0;
+
+	DBG( _DBG_INFO, "Presetting Gamma tables (len=%u)\n", dev->gamma_length );
+	DBG( _DBG_INFO, "----------------------------------\n" );
+
+	/* preset the gamma maps */
+	for( i = 0; i < 4; i++ ) {
+
+		switch( i ) {
+			case 1:  gamma = dev->adj.rgamma;    break;
+			case 2:  gamma = dev->adj.ggamma;    break;
+			case 3:  gamma = dev->adj.bgamma;    break;
+			default: gamma = dev->adj.graygamma; break;
+		}
+
+		for( j = 0; j < dev->gamma_length; j++ ) {
+
+			val = (dev->gamma_range.max *
+					    pow((double) j / ((double)dev->gamma_length - 1.0),
+						1.0 / gamma ));
+
+			if( val > dev->gamma_range.max )
+				val = dev->gamma_range.max;
+
+			dev->gamma_table[i][j] = val;
+		}
+	}
+	return SANE_STATUS_GOOD;
+}
+
+/** Check the gamma vectors we got back and limit if necessary
+ * @param  s - pointer to the scanner specific structure
+ * @return nothing
+ */
+static void u12map_CheckGammaSettings( U12_Device *dev )
+{
+	int i, j;
+
+	for( i = 0; i < 4 ; i++ ) {
+		for( j = 0; j < dev->gamma_length; j++ ) {
+			if( dev->gamma_table[i][j] > dev->gamma_range.max ) {
+				dev->gamma_table[i][j] = dev->gamma_range.max;
+			}
+		}
+	}
+}
+
+/** adjust acording to brightness and contrast
+ */
+static void u12map_Adjust( U12_Device *dev, int which, SANE_Byte *buf )
+{
+	int     i;
+	u_long *pdw;
+	double  b, c, tmp;
+
+	DBG( _DBG_INFO, "u12map_Adjust(%u)\n", which );
+
+	/* adjust brightness (b) and contrast (c) using the function:
+	 *
+	 * s'(x,y) = (s(x,y) + b) * c
+	 * b = [-127, 127]
+	 * c = [0,2]
+	 */
+
+	/* scale brightness and contrast...
+	 */
+	b = ((double)dev->DataInf.siBrightness * 192.0)/100.0;
+	c = ((double)dev->DataInf.siContrast   + 100.0)/100.0;
+
+	DBG( _DBG_INFO, "* brightness   = %i -> %i\n",
+	                 dev->DataInf.siBrightness, (SANE_Byte)b);
+	DBG( _DBG_INFO, "* contrast*100 = %i -> %i\n",
+	                 dev->DataInf.siContrast, (int)(c*100));
+
+	for( i = 0; i < dev->gamma_length; i++ ) {
+
+		if((_MAP_MASTER == which) || (_MAP_RED == which)) {
+			tmp = ((double)(dev->gamma_table[0][i] + b)) * c;
+			if( tmp < 0 )   tmp = 0;
+			if( tmp > 255 ) tmp = 255;
+			buf[i] = (SANE_Byte)tmp;
+		}
+
+		if((_MAP_MASTER == which) || (_MAP_GREEN == which)) {
+			tmp = ((double)(dev->gamma_table[1][i] + b)) * c;
+			if( tmp < 0 )   tmp = 0;
+			if( tmp > 255 ) tmp = 255;
+			buf[4096+i] = (SANE_Byte)tmp;
+    	}
+
+		if((_MAP_MASTER == which) || (_MAP_BLUE == which)) {
+			tmp = ((double)(dev->gamma_table[2][i] + b)) * c;
+			if( tmp < 0 )   tmp = 0;
+			if( tmp > 255 ) tmp = 255;
+			buf[8192+i] = (SANE_Byte)tmp;
+		}
+	}
+
+	if((dev->DataInf.dwScanFlag & _SCANDEF_Negative) ||
+	   (dev->DataInf.wPhyDataType == COLOR_BW)) {
+		DBG( _DBG_INFO, "inverting...\n" );
+
+		if((_MAP_MASTER == which) || (_MAP_RED == which)) {
+
+			DBG( _DBG_INFO, "inverting RED map\n" );
+			pdw = (u_long*)&buf[0];
+		    for( i = dev->gamma_length / 4; i; i--, pdw++ )
+				*pdw = ~(*pdw);
+		}
+
+		if((_MAP_MASTER == which) || (_MAP_GREEN == which)) {
+
+			DBG( _DBG_INFO, "inverting GREEN map\n" );
+			pdw = (u_long*)&buf[4096];
+		    for( i = dev->gamma_length / 4; i; i--, pdw++ )
+				*pdw = ~(*pdw);
+		}
+
+		if((_MAP_MASTER == which) || (_MAP_BLUE == which)) {
+
+			DBG( _DBG_INFO, "inverting BLUE map\n" );
+			pdw = (u_long*)&buf[8192];
+		    for( i = dev->gamma_length / 4; i; i--, pdw++ )
+				*pdw = ~(*pdw);
+		}
+	}
+}
+
+/* END U12-MAP.C ............................................................*/