1 /*.............................................................................
2 * Project : SANE library for Plustek flatbed scanners.
3 *.............................................................................
4 */
5
6 /** @file plustek-usbmap.c
7 * @brief Creating and manipulating lookup tables.
8 *
9 * Based on sources acquired from Plustek Inc.<br>
10 * Copyright (C) 2001-2007 Gerhard Jaeger <gerhard@gjaeger.de>
11 *
12 * History:
13 * - 0.40 - starting version of the USB support
14 * - 0.41 - fixed brightness problem for lineart mode
15 * - 0.42 - removed preset of linear gamma tables
16 * - 0.43 - no changes
17 * - 0.44 - map inversion for negatatives now only upon user request
18 * - 0.45 - no changes
19 * - 0.46 - no changes
20 * - 0.47 - cleanup work
21 * - 0.48 - added support for binary from color scans
22 * - 0.49 - changed usb_MapDownload
23 * - 0.50 - cleanup
24 * - 0.51 - no changes
25 * - 0.52 - no changes
26 * .
27 * <hr>
28 * This file is part of the SANE package.
29 *
30 * This program is free software; you can redistribute it and/or
31 * modify it under the terms of the GNU General Public License as
32 * published by the Free Software Foundation; either version 2 of the
33 * License, or (at your option) any later version.
34 *
35 * This program is distributed in the hope that it will be useful, but
36 * WITHOUT ANY WARRANTY; without even the implied warranty of
37 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
38 * General Public License for more details.
39 *
40 * You should have received a copy of the GNU General Public License
41 * along with this program. If not, see <https://www.gnu.org/licenses/>.
42 *
43 * As a special exception, the authors of SANE give permission for
44 * additional uses of the libraries contained in this release of SANE.
45 *
46 * The exception is that, if you link a SANE library with other files
47 * to produce an executable, this does not by itself cause the
48 * resulting executable to be covered by the GNU General Public
49 * License. Your use of that executable is in no way restricted on
50 * account of linking the SANE library code into it.
51 *
52 * This exception does not, however, invalidate any other reasons why
53 * the executable file might be covered by the GNU General Public
54 * License.
55 *
56 * If you submit changes to SANE to the maintainers to be included in
57 * a subsequent release, you agree by submitting the changes that
58 * those changes may be distributed with this exception intact.
59 *
60 * If you write modifications of your own for SANE, it is your choice
61 * whether to permit this exception to apply to your modifications.
62 * If you do not wish that, delete this exception notice.
63 * <hr>
64 */
65
66 #define _MAP_SIZE 4096
67
68 static SANE_Byte a_bMap[_MAP_SIZE * 3];
69
70 /** adjust according to brightness and contrast
71 */
usb_MapAdjust(Plustek_Device * dev)72 static void usb_MapAdjust( Plustek_Device *dev )
73 {
74 int i, tabLen;
75 double b, c, tmp;
76
77 tabLen = _MAP_SIZE;
78
79 /* adjust brightness (b) and contrast (c) using the function:
80 *
81 * s(x,y) = (s(x,y) + b) * c
82 * b = [-127, 127]
83 * c = [0,2]
84 */
85 b = ((double)dev->scanning.sParam.brightness * 192.0)/100.0;
86 c = ((double)dev->scanning.sParam.contrast + 100.0)/100.0;
87
88 DBG( _DBG_INFO, "* brightness = %i -> %i\n",
89 dev->scanning.sParam.brightness, (u_char)b);
90 DBG( _DBG_INFO, "* contrast = %i -> %.3f\n",
91 dev->scanning.sParam.contrast, c);
92
93 if( dev->scanning.sParam.brightness == 0 && dev->scanning.sParam.contrast )
94 return;
95
96 for( i = 0; i < tabLen; i++ ) {
97
98 tmp = ((double)(a_bMap[i] + b)) * c;
99 if( tmp < 0 ) tmp = 0;
100 if( tmp > 255 ) tmp = 255;
101 a_bMap[i] = (u_char)tmp;
102
103 tmp = ((double)(a_bMap[tabLen+i] + b)) * c;
104 if( tmp < 0 ) tmp = 0;
105 if( tmp > 255 ) tmp = 255;
106 a_bMap[tabLen+i] = (u_char)tmp;
107
108 tmp = ((double)(a_bMap[tabLen*2+i] + b)) * c;
109 if( tmp < 0 ) tmp = 0;
110 if( tmp > 255 ) tmp = 255;
111 a_bMap[tabLen*2+i] = (u_char)tmp;
112 }
113 }
114
115 /**
116 */
usb_MapDownload(Plustek_Device * dev)117 static SANE_Bool usb_MapDownload( Plustek_Device *dev )
118 {
119 ScanDef *scanning = &dev->scanning;
120 DCapsDef *sc = &dev->usbDev.Caps;
121
122 int color;
123 int i, threshold;
124 SANE_Byte value;
125 SANE_Bool fInverse = 0;
126
127 DBG( _DBG_INFO, "usb_MapDownload()\n" );
128
129 /* the maps are have been already set */
130
131 /* do the brightness and contrast adjustment ... */
132 if( scanning->sParam.bDataType != SCANDATATYPE_BW )
133 usb_MapAdjust( dev );
134
135 if( !usbio_WriteReg( dev->fd, 7, 0))
136 return SANE_FALSE;
137
138 /* we download all the time all three color maps, as we run
139 * into trouble elsewhere on CanoScan models using gray mode
140 */
141 for( color = 0; color < 3; color++) {
142
143 /* select color */
144 value = (color << 2)+2;
145
146 /* set gamma color selector */
147 usbio_WriteReg( dev->fd, 0x03, value );
148 usbio_WriteReg( dev->fd, 0x04, 0 );
149 usbio_WriteReg( dev->fd, 0x05, 0 );
150
151 /* write the gamma table entry to merlin */
152 if((scanning->sParam.bDataType == SCANDATATYPE_BW) ||
153 (scanning->fGrayFromColor > 7 )) {
154
155 threshold = (int)((double)scanning->sParam.brightness *
156 (_MAP_SIZE/200.0)) + (_MAP_SIZE/2);
157 threshold = _MAP_SIZE - threshold;
158 if(threshold < 0)
159 threshold = 0;
160 if(threshold > (int)_MAP_SIZE)
161 threshold = _MAP_SIZE;
162
163 DBG(_DBG_INFO, "* Threshold is at %u brightness=%i\n",
164 threshold, scanning->sParam.brightness );
165
166 for(i = 0; i < threshold; i++)
167 a_bMap[color*_MAP_SIZE + i] = 0;
168
169 for(i = threshold; i < _MAP_SIZE; i++)
170 a_bMap[color*_MAP_SIZE + i] = 255;
171
172 fInverse = 1;
173
174 } else {
175 fInverse = 0;
176 }
177
178 if( /*scanning->dwFlag & SCANFLAG_Pseudo48 && */
179 (scanning->sParam.bSource == SOURCE_Negative) &&
180 (sc->workaroundFlag &_WAF_INV_NEGATIVE_MAP)) {
181 fInverse ^= 1;
182 }
183
184 if( fInverse ) {
185
186 u_char map[_MAP_SIZE];
187 u_char *pMap = a_bMap+color*_MAP_SIZE;
188
189 DBG( _DBG_INFO, "* Inverting Map\n" );
190
191 for( i = 0; i < _MAP_SIZE; i++, pMap++ )
192 map[i] = ~*pMap;
193
194 sanei_lm983x_write( dev->fd, 0x06, map, _MAP_SIZE, SANE_FALSE );
195
196 } else {
197 DBG( _DBG_INFO, "* downloading map %u...\n", color );
198 sanei_lm983x_write( dev->fd, 0x06, a_bMap+color*_MAP_SIZE,
199 _MAP_SIZE, SANE_FALSE );
200 }
201
202 } /* for each color */
203
204 DBG( _DBG_INFO, "usb_MapDownload() done.\n" );
205 return SANE_TRUE;
206 }
207
208 /* END PLUSTEK-USBMAP.C .....................................................*/
209