kopia lustrzana https://gitlab.com/sane-project/backends
add strip search function for gl841
Stphane Voltz
rodzic
19d87357c6
commit
97afad85ff
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@ -5811,6 +5811,274 @@ gl841_update_hardware_sensors (Genesys_Scanner * s)
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return status;
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}
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/**
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* search for a full width black or white strip.
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* @param dev scanner device
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* @param forward SANE_TRUE if searching forward, SANE_FALSE if searching backward
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* @param black SANE_TRUE if searching for a black strip, SANE_FALSE for a white strip
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* @return SANE_STATUS_GOOD if a matching strip is found, SANE_STATUS_UNSUPPORTED if not
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*/
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static SANE_Status
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gl841_search_strip (Genesys_Device * dev, SANE_Bool forward, SANE_Bool black)
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{
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unsigned int pixels, lines, channels;
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SANE_Status status;
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Genesys_Register_Set local_reg[GENESYS_GL841_MAX_REGS + 1];
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size_t size;
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uint8_t *data;
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int steps, depth, dpi;
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unsigned int pass, count, found, x, y;
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char title[80];
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Genesys_Register_Set * r;
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DBG (DBG_proc, "gl841_search_strip %s %s\n",black ? "black":"white",forward ? "forward":"reverse");
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gl841_save_power (dev, SANE_FALSE);
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gl841_set_fe (dev, AFE_SET);
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status = gl841_stop_action (dev);
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if (status != SANE_STATUS_GOOD)
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{
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DBG (DBG_error,
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"gl841_search_strip: Failed to stop: %s\n",
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sane_strstatus (status));
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return status;
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}
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/* set up for a gray scan at lowest dpi */
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dpi = 9600;
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for (x = 0; x < MAX_RESOLUTIONS; x++)
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{
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if (dev->model->xdpi_values[x] > 0 && dev->model->xdpi_values[x] < dpi)
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dpi = dev->model->xdpi_values[x];
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}
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channels = 1;
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/* 10 MM */
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lines = (10 * dpi) / MM_PER_INCH;
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/* shading calibation is done with dev->motor.base_ydpi */
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lines = (dev->model->shading_lines * dpi) / dev->motor.base_ydpi;
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depth = 8;
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pixels = (dev->sensor.sensor_pixels * dpi) / dev->sensor.optical_res;
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size = pixels * channels * lines *(depth/8);
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data = malloc (size);
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if (!data)
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{
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DBG (DBG_error, "gl841_search_strip: failed to allocate memory\n");
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return SANE_STATUS_NO_MEM;
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}
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dev->scanhead_position_in_steps = 0;
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memcpy (local_reg, dev->reg,
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(GENESYS_GL841_MAX_REGS + 1) * sizeof (Genesys_Register_Set));
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status = gl841_init_scan_regs (dev,
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local_reg,
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dpi,
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dpi,
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0,
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0,
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pixels,
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lines,
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depth,
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channels,
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0,
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0);
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if (status != SANE_STATUS_GOOD)
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{
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DBG (DBG_error,
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"gl841_search_strip: Failed to setup for scan: %s\n",
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sane_strstatus (status));
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return status;
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}
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/* set up for reverse or forward */
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r = sanei_genesys_get_address (local_reg, 0x02);
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if (forward)
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r->value &= ~4;
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else
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r->value |= 4;
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status = gl841_bulk_write_register (dev, local_reg, GENESYS_GL841_MAX_REGS);
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if (status != SANE_STATUS_GOOD)
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{
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DBG (DBG_error,
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"gl841_search_strip: Failed to bulk write registers: %s\n",
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sane_strstatus (status));
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return status;
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}
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status = gl841_begin_scan (dev, local_reg, SANE_TRUE);
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if (status != SANE_STATUS_GOOD)
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{
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free (data);
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DBG (DBG_error,
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"gl841_search_strip: failed to begin scan: %s\n",
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sane_strstatus (status));
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return status;
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}
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/* waits for valid data */
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do
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sanei_genesys_test_buffer_empty (dev, &steps);
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while (steps);
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/* now we're on target, we can read data */
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status = sanei_genesys_read_data_from_scanner (dev, data, size);
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if (status != SANE_STATUS_GOOD)
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{
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free (data);
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DBG (DBG_error,
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"gl841_search_start_position: failed to read data: %s\n",
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sane_strstatus (status));
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return status;
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}
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status = gl841_end_scan (dev, local_reg, SANE_TRUE);
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if (status != SANE_STATUS_GOOD)
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{
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free (data);
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DBG (DBG_error,
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"gl841_search_strip: failed to end scan: %s\n",
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sane_strstatus (status));
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return status;
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}
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status = gl841_stop_action (dev);
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if (status != SANE_STATUS_GOOD)
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{
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free (data);
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DBG (DBG_error, "gl841_search_strip: gl841_stop_action failed\n");
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return status;
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}
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pass = 0;
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if (DBG_LEVEL >= DBG_data)
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{
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sprintf (title, "search_strip_%s%02d.pnm",
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forward ? "fwd" : "bwd", pass);
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sanei_genesys_write_pnm_file (title, data, depth, channels, pixels, lines);
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}
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/* loop until strip is found or maximum pass number done */
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found = 0;
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while (pass < 20 && !found)
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{
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status =
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gl841_bulk_write_register (dev, local_reg, GENESYS_GL841_MAX_REGS);
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if (status != SANE_STATUS_GOOD)
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{
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DBG (DBG_error,
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"gl841_search_strip: Failed to bulk write registers: %s\n",
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sane_strstatus (status));
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return status;
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}
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/* now start scan */
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status = gl841_begin_scan (dev, local_reg, SANE_TRUE);
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if (status != SANE_STATUS_GOOD)
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{
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free (data);
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DBG (DBG_error,
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"gl841_search_strip: failed to begin scan: %s\n",
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sane_strstatus (status));
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return status;
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}
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/* waits for valid data */
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do
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sanei_genesys_test_buffer_empty (dev, &steps);
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while (steps);
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/* now we're on target, we can read data */
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status = sanei_genesys_read_data_from_scanner (dev, data, size);
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if (status != SANE_STATUS_GOOD)
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{
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free (data);
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DBG (DBG_error,
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"gl841_search_start_position: failed to read data: %s\n",
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sane_strstatus (status));
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return status;
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}
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status = gl841_end_scan (dev, local_reg, SANE_TRUE);
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if (status != SANE_STATUS_GOOD)
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{
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free (data);
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DBG (DBG_error,
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"gl841_search_strip: failed to end scan: %s\n",
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sane_strstatus (status));
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return status;
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}
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status = gl841_stop_action (dev);
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if (status != SANE_STATUS_GOOD)
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{
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free (data);
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DBG (DBG_error, "gl841_search_strip: gl841_stop_action failed\n");
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return status;
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}
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if (DBG_LEVEL >= DBG_data)
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{
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sprintf (title, "search_strip_%s%02d.pnm",
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forward ? "fwd" : "bwd", pass);
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sanei_genesys_write_pnm_file (title, data, depth, channels,
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pixels, lines);
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}
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/* search data to find black strip */
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/* when searching forward, we only need one line of the searched color since we
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* will scan forward. But when doing backward search, we need all the area of the
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* same color */
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count=0;
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for (y = 0; y < lines && !found; y++)
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{
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if(forward)
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{
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count = 0;
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}
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/* count of white/black pixels depending on the color searched */
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for (x = 0; x < pixels; x++)
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{
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/* when searching for black, detect white pixels */
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if (black && data[y * pixels + x] > 60)
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{
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count++;
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}
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/* when searching for white, detect black pixels */
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if (!black && data[y * pixels + x] < 60)
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{
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count++;
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}
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}
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/* at end of line, if count > 2%, line is not fully of the desired color
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* so we must go to next line of the buffer */
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/* count*100/pixels < 3 */
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if ((forward && ((count*100)/pixels)<3)||(!forward && ((count*100)/(pixels*lines)<3)))
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{
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found = 1;
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DBG (DBG_data,
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"gl841_search_strip: strip found during pass %d at line %d\n",
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pass, y);
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}
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}
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pass++;
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}
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free (data);
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if (found)
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{
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status = SANE_STATUS_GOOD;
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DBG (DBG_info, "gl841_search_strip: strip found\n");
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}
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else
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{
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status = SANE_STATUS_UNSUPPORTED;
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DBG (DBG_info, "gl841_search_strip: strip not found\n");
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}
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DBG (DBG_proc, "gl841_search_strip: completed\n");
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return status;
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}
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/** the gl841 command set */
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static Genesys_Command_Set gl841_cmd_set = {
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"gl841-generic", /* the name of this set */
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@ -5860,7 +6128,7 @@ static Genesys_Command_Set gl841_cmd_set = {
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gl841_load_document,
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gl841_detect_document_end,
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gl841_eject_document,
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NULL,
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gl841_search_strip,
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gl841_is_compatible_calibration,
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};
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