1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/* @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, see <https://www.gnu.org/licenses/>.
*
* 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 according 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 ............................................................*/
|
