* doc/plustek/Plustek-USB.changes: Update.

* backend/plustek.c: Bumped build number.
* backend/plustek-usb.c backend/plustek-usbscan.c: Fixed problem,
  when trying to scan at resolutions beyond the optical one
  (sensor stops too early).

backend/plustek-usb.c

@@ -1127,6 +1127,17 @@ static int usbDev_Prepare( Plustek_Device *dev, SANE_Byte *buf )
 
 		usleep( 10 * 1000 );
 
+		/* need to preset that here, as we need it during parameter setting
+		 */
+		scan->bLinesToSkip = (u_char)(scan->sParam.PhyDpi.y / 50);
+
+		scan->dwLinesDiscard = 0;
+		if( scan->sParam.bChannels == 3 ) {
+			scan->dwLinesDiscard = (u_long)scaps->bSensorDistance *
+			                       scan->sParam.PhyDpi.y / scaps->OpticDpi.y;
+			scan->dwLinesDiscard <<= 1;
+		}
+
 		if( !usb_SetScanParameters( dev, &scan->sParam )) {
 			DBG( _DBG_ERROR, "Setting Scan Parameters failed!\n" );
 			return 0;
@@ -1135,7 +1146,7 @@ static int usbDev_Prepare( Plustek_Device *dev, SANE_Byte *buf )
 		/* if we bypass the calibration step, we wait on lamp warmup here...
 		 */
 		if( scaps->workaroundFlag & _WAF_BYPASS_CALIBRATION ) {
-    		if( !usb_Wait4Warmup( dev )) {
+			if( !usb_Wait4Warmup( dev )) {
 				DBG( _DBG_INFO, "usbDev_Prepare() - Cancel detected...\n" );
 				return 0;
 			}
@@ -1256,7 +1267,6 @@ static int usbDev_Prepare( Plustek_Device *dev, SANE_Byte *buf )
 		/* set a funtion to process the RAW data... */
 		usb_GetImageProc( dev );
 
-		scan->bLinesToSkip = (u_char)(scan->sParam.PhyDpi.y / 50);
 		if( scan->sParam.bSource == SOURCE_ADF )
 			scan->dwFlag |= SCANFLAG_StillModule;
 

backend/plustek-usbscan.c

@@ -1250,10 +1250,12 @@ static SANE_Bool usb_SetScanParameters( Plustek_Device *dev, ScanParam *pParam )
 	 */
 	if(pParam->bCalibration == PARAM_Scan && pParam->bSource != SOURCE_ADF) {
 
-		u_short scansteps = (u_short)ceil((double)(pParam->Size.dwPhyLines + 10)*
+		u_long  lines     = pParam->Size.dwPhyLines + scan->bLinesToSkip +
+		                                              scan->dwLinesDiscard + 5;
+		u_short scansteps = (u_short)ceil((double)lines*
 		                                     hw->wMotorDpi / pParam->PhyDpi.y);
-		DBG( _DBG_INFO, "* Scansteps=%u (%lu*%u/%u)\n", scansteps, 
+		DBG( _DBG_INFO, "* Scansteps=%u (%lu*%u/%u)\n", scansteps,  lines,
-		                 pParam->Size.dwPhyLines, hw->wMotorDpi, pParam->PhyDpi.y );
+		                hw->wMotorDpi, pParam->PhyDpi.y );
 		regs[0x4c] = _HIBYTE(scansteps);
 		regs[0x4d] = _LOBYTE(scansteps);
 	}

backend/plustek.c

@@ -153,7 +153,7 @@
 #include "../include/sane/sanei.h"
 #include "../include/sane/saneopts.h"
 
-#define BACKEND_VERSION "0.50-2"
+#define BACKEND_VERSION "0.50-3"
 
 #define BACKEND_NAME    plustek
 #include "../include/sane/sanei_access.h"

doc/plustek/Plustek-USB.changes

@@ -3,6 +3,11 @@ Plustek.changes - Gerhard J
 
 Note: All other not mentioned builds have never been released.
 
+V 0.50-3 (2005-08-22)
+---------------------
+Fixed problem, when trying to scan at resolutions beyond the
+optical one (sensor stops too early)
+
 V 0.50-2 (2005-08-19)
 ---------------------
 More cleanup.