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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/u12-map.c
Initial import of sane-backends version 1.0.24-1.2
Diffstat (limited to 'backend/u12-map.c')
-rw-r--r--backend/u12-map.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/backend/u12-map.c b/backend/u12-map.c
new file mode 100644
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+++ b/backend/u12-map.c
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+/* @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 ............................................................*/