sheetfed calibration tuning

- use sensor max resolution to do led/offset/gain calibration
- use different thresholds when detecting white/black pixels in search
  strip function
- tune device flags for DP485, DP487 and XP100

backend/genesys.c

@@ -3678,6 +3678,7 @@ genesys_sheetfed_calibration (Genesys_Device * dev)
 {
   SANE_Status status = SANE_STATUS_GOOD;
   SANE_Bool forward = SANE_TRUE;
+  int xres;
 
   DBG (DBG_proc, "genesys_sheetfed_calibration: start\n");
   if (dev->model->cmd_set->search_strip == NULL)
@@ -3697,13 +3698,17 @@ genesys_sheetfed_calibration (Genesys_Device * dev)
       return status;
     }
 
-  int yres;
 
   DBG (DBG_info, "genesys_flatbed_calibration\n");
 
-  yres = dev->sensor.optical_res;
-  if (dev->settings.yres <= dev->sensor.optical_res / 2)
-    yres /= 2;
+  /* led, offset and gain calibration are influenced by scan
+   * settings. So we set it to sensor resolution */
+  xres = dev->sensor.optical_res;
+  dev->settings.xres = dev->sensor.optical_res;
+  /* XP200 needs to calibrate a full and half sensor's resolution */
+  if (dev->model->ccd_type == CIS_XP200 
+   && dev->settings.xres <= dev->sensor.optical_res / 2)
+    dev->settings.xres /= 2;
 
   /* the afe needs to sends valid data even before calibration */
 
@@ -3744,7 +3749,7 @@ genesys_sheetfed_calibration (Genesys_Device * dev)
 
       /* since all the registers are set up correctly, just use them */
 
-      status = dev->model->cmd_set->coarse_gain_calibration (dev, yres);
+      status = dev->model->cmd_set->coarse_gain_calibration (dev, xres);
       if (status != SANE_STATUS_GOOD)
 	{
 	  DBG (DBG_error,
@@ -3880,6 +3885,9 @@ genesys_sheetfed_calibration (Genesys_Device * dev)
 	   sane_strstatus (status));
       return status;
     }
+
+  /* resotre settings */
+  dev->settings.xres = xres;
   DBG (DBG_proc, "genesys_sheetfed_calibration: end\n");
   return SANE_STATUS_GOOD;
 }

backend/genesys_devices.c

@@ -1456,9 +1456,10 @@ static Genesys_Model visioneer_xp100_r3_model = {
   MOTOR_ROADWARRIOR,
   GENESYS_FLAG_LAZY_INIT 	/* Which flags are needed for this scanner? */
     | GENESYS_FLAG_SKIP_WARMUP
-    | GENESYS_FLAG_NO_CALIBRATION,
-  GENESYS_HAS_SCAN_SW | GENESYS_HAS_PAGE_LOADED_SW,
-  300,
+    | GENESYS_FLAG_OFFSET_CALIBRATION
+    | GENESYS_FLAG_DARK_CALIBRATION,
+  GENESYS_HAS_SCAN_SW | GENESYS_HAS_PAGE_LOADED_SW | GENESYS_HAS_CALIBRATE,
+  100,
   400
 };
 
@@ -1560,7 +1561,7 @@ static Genesys_Model syscan_docketport_485_model = {
     | GENESYS_FLAG_SKIP_WARMUP
     | GENESYS_FLAG_OFFSET_CALIBRATION
     | GENESYS_FLAG_DARK_CALIBRATION,
-  GENESYS_HAS_SCAN_SW | GENESYS_HAS_PAGE_LOADED_SW,
+  GENESYS_HAS_SCAN_SW | GENESYS_HAS_PAGE_LOADED_SW | GENESYS_HAS_CALIBRATE,
   100,
   400
 };
@@ -1613,7 +1614,7 @@ static Genesys_Model dct_docketport_487_model = {
     | GENESYS_FLAG_OFFSET_CALIBRATION
     | GENESYS_FLAG_DARK_CALIBRATION
     | GENESYS_FLAG_UNTESTED,
-  GENESYS_HAS_SCAN_SW | GENESYS_HAS_PAGE_LOADED_SW,
+  GENESYS_HAS_SCAN_SW | GENESYS_HAS_PAGE_LOADED_SW | GENESYS_HAS_CALIBRATE,
   100,
   400
 };

backend/genesys_gl646.c

@@ -5040,7 +5040,7 @@ gl646_search_strip (Genesys_Device * dev, SANE_Bool forward, SANE_Bool black)
 	      for (x = 0; x < settings.pixels; x++)
 		{
 		  /* when searching for black, detect white pixels */
-		  if (black && data[y * settings.pixels + x] > 60)
+		  if (black && data[y * settings.pixels + x] > 90)
 		    {
 		      count++;
 		    }

backend/genesys_gl841.c

@@ -6073,7 +6073,7 @@ gl841_search_strip (Genesys_Device * dev, SANE_Bool forward, SANE_Bool black)
 	      for (x = 0; x < pixels; x++)
 		{
 		  /* when searching for black, detect white pixels */
-		  if (black && data[y * pixels + x] > 60)
+		  if (black && data[y * pixels + x] > 90)
 		    {
 		      count++;
 		    }