ss_mustek.c revision 1.2
1 /* $NetBSD: ss_mustek.c,v 1.2 1996/03/19 03:05:15 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Joachim Koenig-Baltes. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Joachim Koenig-Baltes. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * special driver for MUSTEK flatbed scanners MFS 06000CX and MFS 12000CX 34 * these scanners come with their own scsi card, containing an NCR53C400 35 * SCSI controller chip. I'm in the progress of writing a driver for this 36 * card to work under NetBSD-current. I've hooked it up to a Seagate ST01 37 * hostadapter in the meantime, giving 350KB/sec for higher resolutions! 38 * 39 * I tried to connect it to my Adaptec 1542B, but with no success. It seems, 40 * it does not like synchronous negotiation between Hostadapter and other 41 * targets, but I could not turn this off for the 1542B. 42 * 43 * There is also an other reason why you would not like to connect it to your 44 * favourite SCSI host adapter: The Mustek DOES NOT DISCONNECT. It will block 45 * other traffic from the bus while a transfer is active. 46 */ 47 48 #include <sys/types.h> 49 #include <sys/param.h> 50 #include <sys/kernel.h> 51 #include <sys/systm.h> 52 #include <sys/fcntl.h> 53 #include <sys/errno.h> 54 #include <sys/ioctl.h> 55 #include <sys/malloc.h> 56 #include <sys/buf.h> 57 #include <sys/proc.h> 58 #include <sys/user.h> 59 #include <sys/device.h> 60 #include <sys/conf.h> /* for cdevsw */ 61 #include <sys/scanio.h> 62 63 #include <scsi/scsi_all.h> 64 #include <scsi/scsi_scanner.h> 65 #include <scsi/scsiconf.h> 66 #include <scsi/ssvar.h> 67 #include <scsi/ss_mustek.h> 68 69 #define MUSTEK_RETRIES 4 70 71 int mustek_get_params __P((struct ss_softc *)); 72 int mustek_set_params __P((struct ss_softc *, struct scan_io *)); 73 int mustek_trigger_scanner __P((struct ss_softc *)); 74 void mustek_minphys __P((struct ss_softc *, struct buf *)); 75 int mustek_read __P((struct ss_softc *, struct buf *)); 76 int mustek_rewind_scanner __P((struct ss_softc *)); 77 78 /* only used internally */ 79 int mustek_get_status __P((struct ss_softc *, int, int)); 80 void mustek_compute_sizes __P((struct ss_softc *)); 81 82 /* 83 * structure for the special handlers 84 */ 85 struct ss_special mustek_special = { 86 mustek_set_params, 87 mustek_trigger_scanner, 88 mustek_get_params, 89 mustek_minphys, 90 mustek_read, 91 mustek_rewind_scanner, 92 NULL, /* no adf support right now */ 93 NULL /* no adf support right now */ 94 }; 95 96 /* 97 * mustek_attach: attach special functions to ss 98 */ 99 void 100 mustek_attach(ss, sa) 101 struct ss_softc *ss; 102 struct scsibus_attach_args *sa; 103 { 104 struct scsi_link *sc_link = sa->sa_sc_link; 105 106 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_attach: start\n")); 107 ss->sio.scan_scanner_type = 0; 108 109 /* first, check the model which determines resolutions */ 110 if (!bcmp(sa->sa_inqbuf->product, "MFS-06000CX", 11)) { 111 ss->sio.scan_scanner_type = MUSTEK_06000CX; 112 printf(": Mustek 6000CX Flatbed 3-pass color scanner, 3 - 600 dpi\n"); 113 } 114 if (!bcmp(sa->sa_inqbuf->product, "MFS-12000CX", 11)) { 115 ss->sio.scan_scanner_type = MUSTEK_12000CX; 116 printf(": Mustek 12000CX Flatbed 3-pass color scanner, 6 - 1200 dpi\n"); 117 } 118 119 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_attach: scanner_type = %d\n", 120 ss->sio.scan_scanner_type)); 121 122 /* install special handlers */ 123 ss->special = &mustek_special; 124 125 /* 126 * populate the scanio struct with legal values 127 * the default should come from user space 128 */ 129 ss->sio.scan_width = 1200; 130 ss->sio.scan_height = 1200; 131 ss->sio.scan_x_resolution = 99; 132 ss->sio.scan_y_resolution = 99; 133 ss->sio.scan_x_origin = 0; 134 ss->sio.scan_y_origin = 0; 135 ss->sio.scan_brightness = 100; 136 ss->sio.scan_contrast = 100; 137 ss->sio.scan_quality = 100; 138 ss->sio.scan_image_mode = SIM_GRAYSCALE; 139 140 mustek_compute_sizes(ss); 141 } 142 143 int 144 mustek_get_params (ss) 145 struct ss_softc *ss; 146 { 147 148 return (0); 149 } 150 151 /* 152 * check the parameters if the mustek is capable of fulfilling it 153 * but don't send the command to the scanner in case the user wants 154 * to change parameters by more than one call 155 */ 156 int 157 mustek_set_params(ss, sio) 158 struct ss_softc *ss; 159 struct scan_io *sio; 160 { 161 int error; 162 163 /* 164 * if the scanner is triggered, then rewind it 165 */ 166 if (ss->flags & SSF_TRIGGERED) { 167 error = mustek_rewind_scanner(ss); 168 if (error) 169 return (error); 170 } 171 172 /* size constraints: 8.5" horizontally and 14" vertically */ 173 #ifdef MUSTEK_INCH_SPEC 174 /* sizes must be a multiple of 1/8" */ 175 sio->scan_x_origin -= sio->scan_x_origin % 150; 176 sio->scan_y_origin -= sio->scan_y_origin % 150; 177 sio->scan_width -= sio->scan_width % 150; 178 sio->scan_height -= sio->scan_height % 150; 179 #endif 180 if (sio->scan_width == 0 || 181 sio->scan_x_origin + sio->scan_width > 10200 || 182 sio->scan_height == 0 || 183 sio->scan_y_origin + sio->scan_height > 16800) 184 return (EINVAL); 185 186 /* 187 * for now, only realize the values for the MUSTEK_06000CX 188 * in the future, values for the MUSTEK_12000CX will be implemented 189 */ 190 191 /* 192 * resolution (dpi) must be <= 300 and a multiple of 3 or 193 * between 300 and 600 and a multiple of 30 194 */ 195 sio->scan_x_resolution -= sio->scan_x_resolution <= 300 ? 196 sio->scan_x_resolution % 3 : sio->scan_x_resolution % 30; 197 sio->scan_y_resolution -= sio->scan_y_resolution <= 300 ? 198 sio->scan_y_resolution % 3 : sio->scan_y_resolution % 30; 199 if (sio->scan_x_resolution < 3 || sio->scan_x_resolution > 600 || 200 sio->scan_x_resolution != sio->scan_y_resolution) 201 return (EINVAL); 202 203 /* assume brightness values are between 64 and 136 in steps of 3 */ 204 sio->scan_brightness -= (sio->scan_brightness - 64) % 3; 205 if (sio->scan_brightness < 64 || sio->scan_brightness > 136) 206 return (EINVAL); 207 208 /* contrast values must be between 16 and 184 in steps of 7 */ 209 sio->scan_contrast -= (sio->scan_contrast - 16) % 7; 210 if (sio->scan_contrast < 16 || sio->scan_contrast > 184) 211 return (EINVAL); 212 213 /* 214 * velocity: between 0 (fast) and 4 (slow) which will be mapped 215 * to 100% = 4, 80% = 3, 60% = 2, 40% = 1, 20% = 0 216 * must be a multiple of 20 217 */ 218 sio->scan_quality -= sio->scan_quality % 20; 219 if (sio->scan_quality < 20 || sio->scan_quality > 100) 220 return (EINVAL); 221 222 switch (sio->scan_image_mode) { 223 case SIM_BINARY_MONOCHROME: 224 case SIM_DITHERED_MONOCHROME: 225 case SIM_GRAYSCALE: 226 case SIM_RED: 227 case SIM_GREEN: 228 case SIM_BLUE: 229 break; 230 default: 231 return (EINVAL); 232 } 233 234 /* change ss_softc to the new values, but save ro-variables */ 235 sio->scan_scanner_type = ss->sio.scan_scanner_type; 236 bcopy(sio, &ss->sio, sizeof(struct scan_io)); 237 238 mustek_compute_sizes(ss); 239 240 return (0); 241 } 242 243 /* 244 * trim the requested transfer to a multiple of the line size 245 * this is called only from ssread() which guarantees, scanner is triggered 246 * In the future, it will trim the transfer to not read to much at a time 247 * because the mustek cannot disconnect. It will be calculated by the 248 * resolution, the velocity and the number of bytes per line. 249 */ 250 void 251 mustek_minphys(ss, bp) 252 struct ss_softc *ss; 253 struct buf *bp; 254 { 255 struct scsi_link *sc_link = ss->sc_link; 256 257 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_minphys: before: %d\n", 258 bp->b_bcount)); 259 bp->b_bcount -= bp->b_bcount % 260 ((ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8); 261 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_minphys: after: %d\n", 262 bp->b_bcount)); 263 } 264 265 /* 266 * trigger the scanner to start a scan operation 267 * this includes sending the mode- and window-data, starting the scanner 268 * and getting the image size info 269 */ 270 int 271 mustek_trigger_scanner(ss) 272 struct ss_softc *ss; 273 { 274 struct mustek_mode_select_cmd mode_cmd; 275 struct mustek_mode_select_data mode_data; 276 struct mustek_set_window_cmd window_cmd; 277 struct mustek_set_window_data window_data; 278 struct mustek_start_scan_cmd start_scan_cmd; 279 struct scsi_link *sc_link = ss->sc_link; 280 int pixel_tlx, pixel_tly, pixel_brx, pixel_bry, paperlength; 281 int error; 282 283 mustek_compute_sizes(ss); 284 285 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_trigger_scanner\n")); 286 287 /* 288 * set the window params and send the scsi command 289 */ 290 bzero(&window_cmd, sizeof(window_cmd)); 291 window_cmd.opcode = MUSTEK_SET_WINDOW; 292 window_cmd.length = sizeof(window_data); 293 294 bzero(&window_data, sizeof(window_data)); 295 window_data.frame.header = MUSTEK_LINEART_BACKGROUND | MUSTEK_UNIT_SPEC; 296 #ifdef MUSTEK_INCH_SPEC 297 /* the positional values are all 1 byte because 256 / 8 = 32" */ 298 pixel_tlx = ss->sio.scan_x_origin / 150; 299 pixel_tly = ss->sio.scan_y_origin / 150; 300 pixel_brx = pixel_tlx + ss->sio.scan_width / 150; 301 pixel_bry = pixel_tly + ss->sio.scan_height / 150; 302 #else 303 pixel_tlx = (ss->sio.scan_x_origin * ss->sio.scan_x_resolution) / 1200; 304 pixel_tly = (ss->sio.scan_y_origin * ss->sio.scan_y_resolution) / 1200; 305 pixel_brx = pixel_tlx + 306 (ss->sio.scan_width * ss->sio.scan_x_resolution) / 1200; 307 pixel_bry = pixel_tly + 308 (ss->sio.scan_height * ss->sio.scan_y_resolution) / 1200; 309 #endif 310 _lto2l(pixel_tlx, window_data.frame.tl_x); 311 _lto2l(pixel_tly, window_data.frame.tl_y); 312 _lto2l(pixel_brx, window_data.frame.br_x); 313 _lto2l(pixel_bry, window_data.frame.br_y); 314 315 #if MUSTEK_WINDOWS >= 1 316 window_data.window1 = window_data.frame; 317 window_data.window1.header = MUSTEK_WINDOW_MASK | MUSTEK_UNIT_SPEC; 318 #endif 319 320 /* send the set window command to the scanner */ 321 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_set_parms: set_window\n")); 322 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &window_cmd, 323 sizeof(window_cmd), (u_char *) &window_data, sizeof(window_data), 324 MUSTEK_RETRIES, 5000, NULL, SCSI_DATA_OUT); 325 if (error) 326 return (error); 327 328 /* 329 * do what it takes to actualize the mode 330 */ 331 bzero(&mode_cmd, sizeof(mode_cmd)); 332 mode_cmd.opcode = MUSTEK_MODE_SELECT; 333 _lto2b(sizeof(mode_data), mode_cmd.length); 334 335 bzero(&mode_data, sizeof(mode_data)); 336 mode_data.mode = 337 MUSTEK_MODE_MASK | MUSTEK_HT_PATTERN_BUILTIN | MUSTEK_UNIT_SPEC; 338 if (ss->sio.scan_x_resolution <= 300) { 339 mode_data.resolution = ss->sio.scan_x_resolution / 3; 340 } else { 341 /* 342 * the resolution values is computed by modulo 100, but not 343 * for 600dpi, where the value is 100 (a bit tricky, but ...) 344 */ 345 mode_data.resolution = 346 ((ss->sio.scan_x_resolution - 1) % 100) + 1; 347 } 348 mode_data.brightness = (ss->sio.scan_brightness - 64) / 3; 349 mode_data.contrast = (ss->sio.scan_contrast - 16) / 7; 350 mode_data.grain = 0; 351 mode_data.velocity = ss->sio.scan_quality / 20 - 1; 352 #ifdef MUSTEK_INCH_SPEC 353 paperlength = 14 * 8; /* 14" */ 354 #else 355 paperlength = 14 * ss->sio.scan_y_resolution; /* 14" */ 356 #endif 357 _lto2l(paperlength, mode_data.paperlength); 358 359 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_trigger_scanner: mode_select\n")); 360 /* send the command to the scanner */ 361 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &mode_cmd, 362 sizeof(mode_cmd), (u_char *) &mode_data, sizeof(mode_data), 363 MUSTEK_RETRIES, 5000, NULL, SCSI_DATA_OUT); 364 if (error) 365 return (error); 366 367 /* 368 * now construct and send the start command 369 */ 370 bzero(&start_scan_cmd,sizeof(start_scan_cmd)); 371 start_scan_cmd.opcode = MUSTEK_START_STOP; 372 start_scan_cmd.mode = MUSTEK_SCAN_START; 373 if (ss->sio.scan_x_resolution <= 300) 374 start_scan_cmd.mode |= MUSTEK_RES_STEP_1; 375 else 376 start_scan_cmd.mode |= MUSTEK_RES_STEP_10; 377 switch (ss->sio.scan_image_mode) { 378 case SIM_BINARY_MONOCHROME: 379 case SIM_DITHERED_MONOCHROME: 380 start_scan_cmd.mode |= MUSTEK_BIT_MODE | MUSTEK_GRAY_FILTER; 381 break; 382 case SIM_GRAYSCALE: 383 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_GRAY_FILTER; 384 break; 385 case SIM_RED: 386 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_RED_FILTER; 387 break; 388 case SIM_GREEN: 389 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_GREEN_FILTER; 390 break; 391 case SIM_BLUE: 392 start_scan_cmd.mode |= MUSTEK_GRAY_MODE | MUSTEK_BLUE_FILTER; 393 break; 394 } 395 396 /* send the command to the scanner */ 397 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_trigger_scanner: start_scan\n")); 398 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &start_scan_cmd, 399 sizeof(start_scan_cmd), NULL, 0, 400 MUSTEK_RETRIES, 5000, NULL, 0); 401 if (error) 402 return (error); 403 404 /* 405 * now check if scanner ready this time with update of size info 406 * we wait here so that if the user issues a read directly afterwards, 407 * the scanner will respond directly (otherwise we had to sleep with 408 * a buffer locked in memory) 409 */ 410 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_trigger_scanner: get_status\n")); 411 error = mustek_get_status(ss, 60, 1); 412 if (error) 413 return (error); 414 415 return (0); 416 } 417 418 /* 419 * stop a scan operation in progress 420 */ 421 int 422 mustek_rewind_scanner(ss) 423 struct ss_softc *ss; 424 { 425 struct mustek_start_scan_cmd cmd; 426 struct scsi_link *sc_link = ss->sc_link; 427 int error; 428 429 if (ss->sio.scan_window_size != 0) { 430 /* 431 * only if not all data has been read, the scanner has to be 432 * stopped 433 */ 434 bzero(&cmd, sizeof(cmd)); 435 cmd.opcode = MUSTEK_START_STOP; 436 cmd.mode = MUSTEK_SCAN_STOP; 437 438 /* send the command to the scanner */ 439 SC_DEBUG(sc_link, SDEV_DB1, 440 ("mustek_rewind_scanner: stop_scan\n")); 441 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 442 sizeof(cmd), NULL, 0, MUSTEK_RETRIES, 5000, NULL, 0); 443 if (error) 444 return (error); 445 } 446 447 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_rewind_scanner: end\n")); 448 449 return (0); 450 } 451 452 /* 453 * read the requested number of bytes/lines from the scanner 454 */ 455 int 456 mustek_read(ss, bp) 457 struct ss_softc *ss; 458 struct buf *bp; 459 { 460 struct mustek_read_cmd cmd; 461 struct scsi_link *sc_link = ss->sc_link; 462 u_long lines_to_read; 463 464 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_read: start\n")); 465 466 bzero(&cmd, sizeof(cmd)); 467 cmd.opcode = MUSTEK_READ; 468 469 /* instead of the bytes, the mustek wants the number of lines */ 470 lines_to_read = bp->b_bcount / 471 ((ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8); 472 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_read: read %d lines\n", 473 lines_to_read)); 474 _lto3b(lines_to_read, cmd.length); 475 476 /* 477 * go ask the adapter to do all this for us 478 */ 479 if (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), 480 (u_char *) bp->b_data, bp->b_bcount, MUSTEK_RETRIES, 10000, bp, 481 SCSI_NOSLEEP | SCSI_DATA_IN) != SUCCESSFULLY_QUEUED) 482 printf("%s: not queued\n", ss->sc_dev.dv_xname); 483 else { 484 ss->sio.scan_lines -= lines_to_read; 485 ss->sio.scan_window_size -= bp->b_bcount; 486 } 487 488 return (0); 489 } 490 491 /* 492 * check if the scanner is ready to take commands 493 * wait timeout seconds and try only every second 494 * if update, then update picture size info 495 * 496 * returns EBUSY if scanner not ready 497 */ 498 int 499 mustek_get_status(ss, timeout, update) 500 struct ss_softc *ss; 501 int timeout, update; 502 { 503 struct mustek_get_status_cmd cmd; 504 struct mustek_get_status_data data; 505 struct scsi_link *sc_link = ss->sc_link; 506 int error, lines, bytes_per_line; 507 508 bzero(&cmd, sizeof(cmd)); 509 cmd.opcode = MUSTEK_GET_STATUS; 510 cmd.length = sizeof(data); 511 512 while (1) { 513 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_get_status: stat_cmd\n")); 514 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 515 sizeof(cmd), (u_char *) &data, sizeof(data), MUSTEK_RETRIES, 516 5000, NULL, SCSI_DATA_IN); 517 if (error) 518 return (error); 519 if ((data.ready_busy == MUSTEK_READY) || 520 (timeout-- <= 0)) 521 break; 522 /* please wait a second */ 523 tsleep((caddr_t)mustek_get_status, PRIBIO + 1, "mtkrdy", hz); 524 } 525 526 if (update) { 527 bytes_per_line = _2ltol(data.bytes_per_line); 528 lines = _3ltol(data.lines); 529 if (lines != ss->sio.scan_lines) { 530 printf("mustek: lines actual(%d) != computed(%d)\n", 531 lines, ss->sio.scan_lines); 532 return (EIO); 533 } 534 if (bytes_per_line * lines != ss->sio.scan_window_size) { 535 printf("mustek: win-size actual(%d) != computed(%d)\n", 536 bytes_per_line * lines, ss->sio.scan_window_size); 537 return (EIO); 538 } 539 540 SC_DEBUG(sc_link, SDEV_DB1, 541 ("mustek_get_size: bpl=%d, lines=%d\n", 542 (ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8, 543 ss->sio.scan_lines)); 544 SC_DEBUG(sc_link, SDEV_DB1, ("window size = %d\n", 545 ss->sio.scan_window_size)); 546 } 547 548 SC_DEBUG(sc_link, SDEV_DB1, ("mustek_get_status: end\n")); 549 if (data.ready_busy == MUSTEK_READY) 550 return (0); 551 else 552 return (EBUSY); 553 } 554 555 /* 556 * mustek_compute_sizes: compute window_size and lines for the picture 557 * this function is called from different places in the code 558 */ 559 void 560 mustek_compute_sizes(ss) 561 struct ss_softc *ss; 562 { 563 564 switch (ss->sio.scan_image_mode) { 565 case SIM_BINARY_MONOCHROME: 566 case SIM_DITHERED_MONOCHROME: 567 ss->sio.scan_bits_per_pixel = 1; 568 break; 569 case SIM_GRAYSCALE: 570 case SIM_RED: 571 case SIM_GREEN: 572 case SIM_BLUE: 573 ss->sio.scan_bits_per_pixel = 8; 574 break; 575 } 576 577 /* 578 * horizontal number of bytes is always a multiple of 2, 579 * in 8-bit mode at least 580 */ 581 ss->sio.scan_pixels_per_line = 582 (ss->sio.scan_width * ss->sio.scan_x_resolution) / 1200; 583 if (ss->sio.scan_bits_per_pixel == 1) 584 /* make it a multiple of 16, and thus of 2 bytes */ 585 ss->sio.scan_pixels_per_line = 586 (ss->sio.scan_pixels_per_line + 15) & 0xfffffff0; 587 else 588 ss->sio.scan_pixels_per_line = 589 (ss->sio.scan_pixels_per_line + 1) & 0xfffffffe; 590 591 ss->sio.scan_lines = 592 (ss->sio.scan_height * ss->sio.scan_y_resolution) / 1200; 593 ss->sio.scan_window_size = ss->sio.scan_lines * 594 ((ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8); 595 } 596
Indexes created Thu Sep 25 02:09:54 GMT 2025