[sane-devel] Epson perfection 4990 photo/GT-X800 patch for 4800 dpi

[Claus Boje]

Hello

This scanner has a bug, it only reports maximum 3200 dpi back.

Here is a patch there will let this scanner be seen as a 4800 dpi

How do I get this patch in the next version of sane backends ?

This patch is make from sane-backends-1.0.17 and the the file needed to be
patch is backend/epson.c

patch --->

--- backend/epson.c	2005-01-10 20:23:08.000000000 +0100
+++ backend_4990/epson_4990.c	2006-03-22 17:56:08.000000000 +0100
@@ -14,6 +14,7 @@
    Copyright (C) 2000 Mike Porter <mike at udel.edu> (mjp)
    Copyright (C) 2003 EPSON KOWA Corporation
    Copyright (C) 1999-2005 Karl Heinz Kremer <khk at khk.net>
+   Copyright (C) 2006 Claus Boje <claus at egehuset.dk>
 */
 
 #define	SANE_EPSON_VERSION	"SANE Epson Backend v0.2.45 -
2000-01-09"
@@ -59,6 +60,7 @@
    If you do not wish that, delete this exception notice.  */
 
 /*
+   2006-03-12   Added support for perfetion 4990 photo 4800 dpi
    2005-01-09   "flaming hack to get USB scanners working without timeouts
under linux" 
 		submitted by "Steve" (in comment to bug #300830)
    2004-12-18   Added USB IDs for CX-4600 and CX-3650
@@ -2478,6 +2480,21 @@
 	  SANE_FIX ((buf[10] << 8 | buf[9]) * 25.4 / dev->dpi_range.max);
 	dev->tpu_y_range.quant = 0;
 
+        /* 
+         * Check for Perfection 4990 photo/GT-X800 scanner.
+         * This scanner only report 3200 dpi back.
+         * The scanner fysical supports 4800 dpi.
+         * This is simulated here...
+         * Futher details read:
+         * EPSON Programming guide for EPSON Color Image Scanner Perfection
4990
+         */
+        if (strncmp(&buf[0x1A],"GT-X800",7) == 0)
+        {
+	  dev->tpu_x_range.max = (dev->tpu_x_range.max/32)*48; 
+	  dev->tpu_y_range.max = (dev->tpu_y_range.max/32)*48; 
+	  DBG (5, "dpi_range.max %x \n",  dev->dpi_range.max);
+        }
+ 
 	DBG (5, "tpu tlx %f tly %f brx %f bry %f [mm]\n",
 	     SANE_UNFIX (dev->tpu_x_range.min),
 	     SANE_UNFIX (dev->tpu_y_range.min),
@@ -5949,7 +5966,6 @@
     /* we need to correct for the difference in size between
        the EpsonIdentRec and the EpsonHdrRec */
     int correction = sizeof (EpsonIdentRec) - sizeof (EpsonHdrRec);
-
     for (n = (count - correction), buf = ident->buf; n; n -= k, buf += k)
     {
       switch (*buf)
@@ -5982,6 +5998,53 @@
 
 	  DBG (1, "maximum scan area: x %d y %d\n", x, y);
 	  k = 5;
+
+          /* 
+           * Check for Perfection 4990 photo/GT-X800 scanner.
+           * This scanner only report 3200 dpi back.
+           * The scanner fysical supports 4800 dpi.
+           * This is simulated here...
+           * Futher details read:
+           * EPSON Programming guide for EPSON Color Image Scanner
Perfection 4990
+           */
+          if (s->hw->cmd->request_extended_status != 0)
+          {
+            u_char *buf;
+            u_char params[2];
+            EpsonHdr head;
+
+            params[0] = ESC;
+            params[1] = s->hw->cmd->request_extended_status;
+
+            if (NULL != (head = (EpsonHdr) command (s, params, 2,
&status)))
+            {
+              buf = &head->buf[0x1A];
+	      DBG (1, "product name %x %x %x %x %x %x %x %x \n", buf[0],
buf[1],buf[2],buf[3],buf[4], buf[5],buf[6], buf[7] );
+              if (strncmp(buf,"GT-X800",7) == 0)
+              {
+                int val = 0x12 << 8 | 0xC0;   
+                
+                s->hw->res_list_size++;
+	        s->hw->res_list =
+	         (SANE_Int *) realloc (s->hw->res_list,
+		        		  s->hw->res_list_size * sizeof
(SANE_Int));
+
+	        if (NULL == s->hw->res_list)
+	        {
+	          DBG (1, "out of memory (line %d)\n", __LINE__);
+	          return SANE_STATUS_NO_MEM;
+	        }
+
+	        s->hw->res_list[s->hw->res_list_size - 1] = (SANE_Int) val;
+                x = (x/32)*48;
+                y = (y/32)*48;
+
+	        DBG (1, "resolution (dpi): %d\n", val);
+	        DBG (1, "maximum scan area GT-X800: x %d y %d\n", x, y);
+              }
+            }
+          }
+
 	  continue;
 	}
       default:


----
Claus Boje