| 1 | /* $NetBSD: ss_scanjet.c,v 1.54 2016/11/20 15:37:19 mlelstv Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1995 Kenneth Stailey. 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 Kenneth Stailey. |
| 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 functions for the HP ScanJet IIc and IIcx |
| 34 | */ |
| 35 | |
| 36 | #include <sys/cdefs.h> |
| 37 | __KERNEL_RCSID(0, "$NetBSD: ss_scanjet.c,v 1.54 2016/11/20 15:37:19 mlelstv Exp $" ); |
| 38 | |
| 39 | #include <sys/param.h> |
| 40 | #include <sys/systm.h> |
| 41 | #include <sys/fcntl.h> |
| 42 | #include <sys/errno.h> |
| 43 | #include <sys/ioctl.h> |
| 44 | #include <sys/malloc.h> |
| 45 | #include <sys/buf.h> |
| 46 | #include <sys/bufq.h> |
| 47 | #include <sys/proc.h> |
| 48 | #include <sys/device.h> |
| 49 | #include <sys/conf.h> /* for cdevsw */ |
| 50 | #include <sys/scanio.h> |
| 51 | #include <sys/kernel.h> |
| 52 | |
| 53 | #include <dev/scsipi/scsipi_all.h> |
| 54 | #include <dev/scsipi/scsi_all.h> |
| 55 | #include <dev/scsipi/scsi_scanner.h> |
| 56 | #include <dev/scsipi/scsipiconf.h> |
| 57 | #include <dev/scsipi/scsipi_base.h> |
| 58 | #include <dev/scsipi/ssvar.h> |
| 59 | |
| 60 | #define SCANJET_RETRIES 4 |
| 61 | |
| 62 | static int scanjet_get_params(struct ss_softc *); |
| 63 | static int scanjet_set_params(struct ss_softc *, struct scan_io *); |
| 64 | static int scanjet_trigger_scanner(struct ss_softc *); |
| 65 | static int scanjet_read(struct ss_softc *, struct buf *); |
| 66 | |
| 67 | /* only used internally */ |
| 68 | static int scanjet_ctl_write(struct ss_softc *, char *, u_int); |
| 69 | static int scanjet_ctl_read(struct ss_softc *, char *, u_int); |
| 70 | static int scanjet_set_window(struct ss_softc *); |
| 71 | static int scanjet_compute_sizes(struct ss_softc *); |
| 72 | |
| 73 | /* structure for the special handlers */ |
| 74 | static struct ss_special scanjet_special = { |
| 75 | scanjet_set_params, |
| 76 | scanjet_trigger_scanner, |
| 77 | scanjet_get_params, |
| 78 | NULL, /* no special minphys */ |
| 79 | scanjet_read, /* scsi 6-byte read */ |
| 80 | NULL, /* no "rewind" code (yet?) */ |
| 81 | NULL, /* no adf support right now */ |
| 82 | NULL /* no adf support right now */ |
| 83 | }; |
| 84 | |
| 85 | /* scanjet_attach: attach special functions to ss */ |
| 86 | void |
| 87 | scanjet_attach(struct ss_softc *ss, struct scsipibus_attach_args *sa) |
| 88 | { |
| 89 | int error; |
| 90 | |
| 91 | SC_DEBUG(ss->sc_periph, SCSIPI_DB1, ("scanjet_attach: start\n" )); |
| 92 | ss->sio.scan_scanner_type = 0; |
| 93 | |
| 94 | printf("%s: " , device_xname(ss->sc_dev)); |
| 95 | |
| 96 | /* first, check the model (which determines nothing yet) */ |
| 97 | if (!memcmp(sa->sa_inqbuf.product, "C1750A" , 6)) { |
| 98 | ss->sio.scan_scanner_type = HP_SCANJET_IIC; |
| 99 | printf("HP ScanJet IIc" ); |
| 100 | } else if (!memcmp(sa->sa_inqbuf.product, "C2500A" , 6)) { |
| 101 | ss->sio.scan_scanner_type = HP_SCANJET_IIC; |
| 102 | printf("HP ScanJet IIcx" ); |
| 103 | } else if (!memcmp(sa->sa_inqbuf.product, "C2520A" , 6)) { |
| 104 | ss->sio.scan_scanner_type = HP_SCANJET_IIC; |
| 105 | printf("HP ScanJet 4c" ); |
| 106 | } else if (!memcmp(sa->sa_inqbuf.product, "C1130A" , 6)) { |
| 107 | ss->sio.scan_scanner_type = HP_SCANJET_IIC; |
| 108 | printf("HP ScanJet 4p" ); |
| 109 | } else if (!memcmp(sa->sa_inqbuf.product, "C5110A" , 6)) { |
| 110 | ss->sio.scan_scanner_type = HP_SCANJET_IIC; |
| 111 | printf("HP ScanJet 5p" ); |
| 112 | } else { |
| 113 | ss->sio.scan_scanner_type = HP_SCANJET_IIC; |
| 114 | printf("HP ScanJet (unknown model)" ); |
| 115 | } |
| 116 | |
| 117 | SC_DEBUG(ss->sc_periph, SCSIPI_DB1, |
| 118 | ("scanjet_attach: scanner_type = %d\n" , |
| 119 | ss->sio.scan_scanner_type)); |
| 120 | |
| 121 | /* now install special handlers */ |
| 122 | ss->special = &scanjet_special; |
| 123 | |
| 124 | /* populate the scanio struct with legal values */ |
| 125 | ss->sio.scan_width = 1200; |
| 126 | ss->sio.scan_height = 1200; |
| 127 | ss->sio.scan_x_resolution = 100; |
| 128 | ss->sio.scan_y_resolution = 100; |
| 129 | ss->sio.scan_x_origin = 0; |
| 130 | ss->sio.scan_y_origin = 0; |
| 131 | ss->sio.scan_brightness = 128; |
| 132 | ss->sio.scan_contrast = 128; |
| 133 | ss->sio.scan_quality = 100; |
| 134 | ss->sio.scan_image_mode = SIM_GRAYSCALE; |
| 135 | |
| 136 | error = scanjet_set_window(ss); |
| 137 | if (error) { |
| 138 | printf(" set_window failed\n" ); |
| 139 | return; |
| 140 | } |
| 141 | error = scanjet_compute_sizes(ss); |
| 142 | if (error) { |
| 143 | printf(" compute_sizes failed\n" ); |
| 144 | return; |
| 145 | } |
| 146 | printf("\n" ); |
| 147 | } |
| 148 | |
| 149 | static int |
| 150 | scanjet_get_params(struct ss_softc *ss) |
| 151 | { |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * check the parameters if the scanjet is capable of fulfilling it |
| 157 | * but don't send the command to the scanner in case the user wants |
| 158 | * to change parameters by more than one call |
| 159 | */ |
| 160 | static int |
| 161 | scanjet_set_params(struct ss_softc *ss, struct scan_io *sio) |
| 162 | { |
| 163 | int error; |
| 164 | |
| 165 | #if 0 |
| 166 | /* |
| 167 | * if the scanner is triggered, then rewind it |
| 168 | */ |
| 169 | if (ss->flags & SSF_TRIGGERED) { |
| 170 | error = scanjet_rewind_scanner(ss); |
| 171 | if (error) |
| 172 | return error; |
| 173 | } |
| 174 | #endif |
| 175 | |
| 176 | /* size constraints... */ |
| 177 | if (sio->scan_width == 0 || |
| 178 | sio->scan_x_origin + sio->scan_width > 10200 || /* 8.5" */ |
| 179 | sio->scan_height == 0 || |
| 180 | sio->scan_y_origin + sio->scan_height > 16800) /* 14" */ |
| 181 | return EINVAL; |
| 182 | |
| 183 | /* resolution (dpi)... */ |
| 184 | if (sio->scan_x_resolution < 100 || |
| 185 | sio->scan_x_resolution > 400 || |
| 186 | sio->scan_y_resolution < 100 || |
| 187 | sio->scan_y_resolution > 400) |
| 188 | return EINVAL; |
| 189 | |
| 190 | switch (sio->scan_image_mode) { |
| 191 | case SIM_BINARY_MONOCHROME: |
| 192 | case SIM_DITHERED_MONOCHROME: |
| 193 | case SIM_GRAYSCALE: |
| 194 | case SIM_COLOR: |
| 195 | break; |
| 196 | default: |
| 197 | return EINVAL; |
| 198 | } |
| 199 | |
| 200 | /* change ss_softc to the new values, but save ro-variables */ |
| 201 | sio->scan_scanner_type = ss->sio.scan_scanner_type; |
| 202 | memcpy(&ss->sio, sio, sizeof(struct scan_io)); |
| 203 | |
| 204 | error = scanjet_set_window(ss); |
| 205 | if (error) { |
| 206 | uprintf("%s: set_window failed\n" , device_xname(ss->sc_dev)); |
| 207 | return error; |
| 208 | } |
| 209 | error = scanjet_compute_sizes(ss); |
| 210 | if (error) { |
| 211 | uprintf("%s: compute_sizes failed\n" , device_xname(ss->sc_dev)); |
| 212 | return error; |
| 213 | } |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * trigger the scanner to start a scan operation |
| 219 | * this includes sending the mode- and window-data, |
| 220 | * and starting the scanner |
| 221 | */ |
| 222 | static int |
| 223 | scanjet_trigger_scanner(struct ss_softc *ss) |
| 224 | { |
| 225 | char escape_codes[20]; |
| 226 | int error; |
| 227 | |
| 228 | error = scanjet_set_window(ss); |
| 229 | if (error) { |
| 230 | uprintf("%s: set_window failed\n" , device_xname(ss->sc_dev)); |
| 231 | return error; |
| 232 | } |
| 233 | error = scanjet_compute_sizes(ss); |
| 234 | if (error) { |
| 235 | uprintf("%s: compute_sizes failed\n" , device_xname(ss->sc_dev)); |
| 236 | return error; |
| 237 | } |
| 238 | |
| 239 | /* send "trigger" operation */ |
| 240 | strlcpy(escape_codes, "\033*f0S" , sizeof(escape_codes)); |
| 241 | error = scanjet_ctl_write(ss, escape_codes, strlen(escape_codes)); |
| 242 | if (error) { |
| 243 | uprintf("%s: trigger_scanner failed\n" , |
| 244 | device_xname(ss->sc_dev)); |
| 245 | return error; |
| 246 | } |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | static int |
| 251 | scanjet_read(struct ss_softc *ss, struct buf *bp) |
| 252 | { |
| 253 | struct scsi_rw_scanner cmd; |
| 254 | struct scsipi_xfer *xs; |
| 255 | struct scsipi_periph *periph = ss->sc_periph; |
| 256 | int error __diagused; |
| 257 | |
| 258 | /* Fill out the scsi command */ |
| 259 | memset(&cmd, 0, sizeof(cmd)); |
| 260 | cmd.opcode = READ; |
| 261 | |
| 262 | /* |
| 263 | * Handle "fixed-block-mode" tape drives by using the |
| 264 | * block count instead of the length. |
| 265 | */ |
| 266 | _lto3b(bp->b_bcount, cmd.len); |
| 267 | |
| 268 | /* go ask the adapter to do all this for us */ |
| 269 | xs = scsipi_make_xs_locked(periph, |
| 270 | (struct scsipi_generic *)&cmd, sizeof(cmd), |
| 271 | (u_char *)bp->b_data, bp->b_bcount, |
| 272 | SCANJET_RETRIES, 100000, bp, |
| 273 | XS_CTL_NOSLEEP | XS_CTL_ASYNC | XS_CTL_DATA_IN); |
| 274 | if (xs == NULL) { |
| 275 | /* |
| 276 | * out of memory. Keep this buffer in the queue, and |
| 277 | * retry later. |
| 278 | */ |
| 279 | callout_reset(&ss->sc_callout, hz / 2, ssrestart, periph); |
| 280 | return 0; |
| 281 | } |
| 282 | #ifdef DIAGNOSTIC |
| 283 | if (bufq_get(ss->buf_queue) != bp) |
| 284 | panic("ssstart(): dequeued wrong buf" ); |
| 285 | #else |
| 286 | bufq_get(ss->buf_queue); |
| 287 | #endif |
| 288 | error = scsipi_execute_xs(xs); |
| 289 | /* with a scsipi_xfer preallocated, scsipi_command can't fail */ |
| 290 | KASSERT(error == 0); |
| 291 | ss->sio.scan_window_size -= bp->b_bcount; |
| 292 | #if 0 |
| 293 | if (ss->sio.scan_window_size < 0) |
| 294 | ss->sio.scan_window_size = 0; |
| 295 | #endif |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | |
| 300 | /* Do a synchronous write. Used to send control messages. */ |
| 301 | static int |
| 302 | scanjet_ctl_write(struct ss_softc *ss, char *tbuf, u_int size) |
| 303 | { |
| 304 | struct scsi_rw_scanner cmd; |
| 305 | int flags; |
| 306 | |
| 307 | flags = 0; |
| 308 | if ((ss->flags & SSF_AUTOCONF) != 0) |
| 309 | flags |= XS_CTL_DISCOVERY; |
| 310 | |
| 311 | memset(&cmd, 0, sizeof(cmd)); |
| 312 | cmd.opcode = WRITE; |
| 313 | _lto3b(size, cmd.len); |
| 314 | |
| 315 | return scsipi_command(ss->sc_periph, |
| 316 | (void *)&cmd, sizeof(cmd), (void *)tbuf, size, 0, 100000, NULL, |
| 317 | flags | XS_CTL_DATA_OUT); |
| 318 | } |
| 319 | |
| 320 | |
| 321 | /* Do a synchronous read. Used to read responses to control messages. */ |
| 322 | static int |
| 323 | scanjet_ctl_read(struct ss_softc *ss, char *tbuf, u_int size) |
| 324 | { |
| 325 | struct scsi_rw_scanner cmd; |
| 326 | int flags; |
| 327 | |
| 328 | flags = 0; |
| 329 | if ((ss->flags & SSF_AUTOCONF) != 0) |
| 330 | flags |= XS_CTL_DISCOVERY; |
| 331 | |
| 332 | memset(&cmd, 0, sizeof(cmd)); |
| 333 | cmd.opcode = READ; |
| 334 | _lto3b(size, cmd.len); |
| 335 | |
| 336 | return scsipi_command(ss->sc_periph, |
| 337 | (void *)&cmd, sizeof(cmd), (void *)tbuf, size, 0, 100000, NULL, |
| 338 | flags | XS_CTL_DATA_IN); |
| 339 | } |
| 340 | |
| 341 | |
| 342 | #ifdef SCANJETDEBUG |
| 343 | static void |
| 344 | show_es(char *es) |
| 345 | { |
| 346 | char *p = es; |
| 347 | |
| 348 | while (*p) { |
| 349 | if (*p == '\033') |
| 350 | printf("[Esc]" ); |
| 351 | else |
| 352 | printf("%c" , *p); |
| 353 | ++p; |
| 354 | } |
| 355 | printf("\n" ); |
| 356 | } |
| 357 | #endif |
| 358 | |
| 359 | /* |
| 360 | * simulate SCSI_SET_WINDOW for ScanJets |
| 361 | */ |
| 362 | static int |
| 363 | scanjet_set_window(struct ss_softc *ss) |
| 364 | { |
| 365 | char escape_codes[128], *p, *ep; |
| 366 | |
| 367 | p = escape_codes; |
| 368 | ep = &escape_codes[128]; |
| 369 | |
| 370 | p += snprintf(p, ep - p, "\033*f%ldP" , ss->sio.scan_width / 4); |
| 371 | p += snprintf(p, ep - p, "\033*f%ldQ" , ss->sio.scan_height / 4); |
| 372 | p += snprintf(p, ep - p, "\033*f%ldX" , ss->sio.scan_x_origin / 4); |
| 373 | p += snprintf(p, ep - p, "\033*f%ldY" , ss->sio.scan_y_origin / 4); |
| 374 | p += snprintf(p, ep - p, "\033*a%dR" , ss->sio.scan_x_resolution); |
| 375 | p += snprintf(p, ep - p, "\033*a%dS" , ss->sio.scan_y_resolution); |
| 376 | |
| 377 | switch (ss->sio.scan_image_mode) { |
| 378 | case SIM_BINARY_MONOCHROME: |
| 379 | ss->sio.scan_bits_per_pixel = 1; |
| 380 | /* use "line art" mode */ |
| 381 | strlcpy(p, "\033*a0T" , ep - p); |
| 382 | p += strlen(p); |
| 383 | /* make image data be "min-is-white ala PBM */ |
| 384 | strlcpy(p, "\033*a0I" , ep - p); |
| 385 | p += strlen(p); |
| 386 | break; |
| 387 | case SIM_DITHERED_MONOCHROME: |
| 388 | ss->sio.scan_bits_per_pixel = 1; |
| 389 | /* use dithered mode */ |
| 390 | strlcpy(p, "\033*a3T" , ep - p); |
| 391 | p += strlen(p); |
| 392 | /* make image data be "min-is-white ala PBM */ |
| 393 | strlcpy(p, "\033*a0I" , ep - p); |
| 394 | p += strlen(p); |
| 395 | break; |
| 396 | case SIM_GRAYSCALE: |
| 397 | ss->sio.scan_bits_per_pixel = 8; |
| 398 | /* use grayscale mode */ |
| 399 | strlcpy(p, "\033*a4T" , ep - p); |
| 400 | p += strlen(p); |
| 401 | /* make image data be "min-is-black ala PGM */ |
| 402 | strlcpy(p, "\033*a1I" , ep - p); |
| 403 | p += strlen(p); |
| 404 | break; |
| 405 | case SIM_COLOR: |
| 406 | ss->sio.scan_bits_per_pixel = 24; |
| 407 | /* use RGB color mode */ |
| 408 | strlcpy(p, "\033*a5T" , ep - p); |
| 409 | p += strlen(p); |
| 410 | /* make image data be "min-is-black ala PPM */ |
| 411 | strlcpy(p, "\033*a1I" , ep - p); |
| 412 | p += strlen(p); |
| 413 | /* use pass-through matrix (disable NTSC) */ |
| 414 | strlcpy(p, "\033*u2T" , ep - p); |
| 415 | p += strlen(p); |
| 416 | break; |
| 417 | } |
| 418 | |
| 419 | p += snprintf(p, ep - p, "\033*a%dG" , ss->sio.scan_bits_per_pixel); |
| 420 | p += snprintf(p, ep - p, "\033*a%dL" , |
| 421 | (int)(ss->sio.scan_brightness) - 128); |
| 422 | p += snprintf(p, ep - p, "\033*a%dK" , |
| 423 | (int)(ss->sio.scan_contrast) - 128); |
| 424 | |
| 425 | return scanjet_ctl_write(ss, escape_codes, p - escape_codes); |
| 426 | } |
| 427 | |
| 428 | static int |
| 429 | scanjet_compute_sizes(struct ss_softc *ss) |
| 430 | { |
| 431 | int error; |
| 432 | static const char *wfail = "%s: interrogate write failed\n" ; |
| 433 | static const char *rfail = "%s: interrogate read failed\n" ; |
| 434 | static const char *dfail = "%s: bad data returned\n" ; |
| 435 | char escape_codes[20]; |
| 436 | char response[20]; |
| 437 | char *p; |
| 438 | |
| 439 | /* |
| 440 | * Deal with the fact that the HP ScanJet IIc uses 1/300" not 1/1200" |
| 441 | * as its base unit of measurement. PINT uses 1/1200" (yes I know |
| 442 | * ScanJet II's use decipoints as well but 1200 % 720 != 0) |
| 443 | */ |
| 444 | ss->sio.scan_width = (ss->sio.scan_width + 3) & 0xfffffffc; |
| 445 | ss->sio.scan_height = (ss->sio.scan_height + 3) & 0xfffffffc; |
| 446 | |
| 447 | switch (ss->sio.scan_image_mode) { |
| 448 | case SIM_BINARY_MONOCHROME: |
| 449 | case SIM_DITHERED_MONOCHROME: |
| 450 | /* bytes wide */ |
| 451 | strlcpy(escape_codes, "\033*s1025E" , sizeof(escape_codes)); |
| 452 | break; |
| 453 | case SIM_GRAYSCALE: |
| 454 | case SIM_COLOR: |
| 455 | /* pixels wide */ |
| 456 | strlcpy(escape_codes, "\033*s1024E" , sizeof(escape_codes)); |
| 457 | break; |
| 458 | } |
| 459 | error = scanjet_ctl_write(ss, escape_codes, strlen(escape_codes)); |
| 460 | if (error) { |
| 461 | uprintf(wfail, device_xname(ss->sc_dev)); |
| 462 | return error; |
| 463 | } |
| 464 | error = scanjet_ctl_read(ss, response, 20); |
| 465 | if (error) { |
| 466 | uprintf(rfail, device_xname(ss->sc_dev)); |
| 467 | return error; |
| 468 | } |
| 469 | p = strchr(response, 'd'); |
| 470 | if (p == 0) { |
| 471 | uprintf(dfail, device_xname(ss->sc_dev)); |
| 472 | return EIO; |
| 473 | } |
| 474 | ss->sio.scan_pixels_per_line = strtoul(p + 1, NULL, 10); |
| 475 | if (ss->sio.scan_image_mode < SIM_GRAYSCALE) |
| 476 | ss->sio.scan_pixels_per_line *= 8; |
| 477 | |
| 478 | /* pixels high */ |
| 479 | strlcpy(escape_codes, "\033*s1026E" , sizeof(escape_codes)); |
| 480 | error = scanjet_ctl_write(ss, escape_codes, strlen(escape_codes)); |
| 481 | if (error) { |
| 482 | uprintf(wfail, device_xname(ss->sc_dev)); |
| 483 | return error; |
| 484 | } |
| 485 | error = scanjet_ctl_read(ss, response, 20); |
| 486 | if (error) { |
| 487 | uprintf(rfail, device_xname(ss->sc_dev)); |
| 488 | return error; |
| 489 | } |
| 490 | p = strchr(response, 'd'); |
| 491 | if (p == 0) { |
| 492 | uprintf(dfail, device_xname(ss->sc_dev)); |
| 493 | return EIO; |
| 494 | } |
| 495 | ss->sio.scan_lines = strtoul(p + 1, NULL, 10); |
| 496 | |
| 497 | ss->sio.scan_window_size = ss->sio.scan_lines * |
| 498 | ((ss->sio.scan_pixels_per_line * ss->sio.scan_bits_per_pixel) / 8); |
| 499 | |
| 500 | return 0; |
| 501 | } |
| 502 | |