diff --git a/src/devctxt.c b/src/devctxt.c
index 234ac5e..88a1f89 100755
--- a/src/devctxt.c
+++ b/src/devctxt.c
@@ -19,7 +19,7 @@ inline static BYTE line_clip_outcode(INT32 x, INT32 y, INT32 xmin, INT32 ymin, I
   return rc;
 }
 
-#define CPX 4  /* clipping precision in bits */
+#define CPX 8  /* clipping precision in bits */
 
 #define ONE (1 << CPX)  /* constant for mathematics */
 
@@ -69,29 +69,25 @@ static BOOL line_clip(PINT32 output, INT32 x1, INT32 y1, INT32 x2, INT32 y2, INT
 	}
 	if (outcode1 & 0x8)
 	{
-	  tmp = M(x2 - x1, D(ymin - y1, y2 - y1));
-	  x1 += tmp;
+	  x1 += M(x2 - x1, D(ymin - y1, y2 - y1));
 	  y1 = ymin;
 	  Log(LDEBUG, "clipped against top to point (%d, %d), dx=%d/%d", x1 >> CPX, y1 >> CPX, tmp >> CPX, tmp);
 	}
 	else if (outcode1 & 0x4)
 	{
-	  tmp = M(x2 - x1, D(ymax - ONE - y1, y2 - y1));
-	  x1 += tmp;
+	  x1 += M(x2 - x1, D(ymax - ONE - y1, y2 - y1));
 	  y1 = ymax - ONE;
 	  Log(LDEBUG, "clipped against bottom to point (%d, %d), dx=%d/%d", x1 >> CPX, y1 >> CPX, tmp >> CPX, tmp);
 	}
 	else if (outcode1 & 0x2)
 	{
-	  tmp = M(y2 - y1, D(xmax - ONE - x1, x2 - x1));
-	  y1 += tmp;
+	  y1 += M(y2 - y1, D(xmax - ONE - x1, x2 - x1));
 	  x1 = xmax - ONE;
 	  Log(LDEBUG, "clipped against right to point (%d, %d), dy=%d/%d", x1 >> CPX, y1 >> CPX, tmp >> CPX, tmp);
 	}
 	else if (outcode1 & 0x1)
 	{
-	  tmp = M(y2 - y1, D(xmin - x1, x2 - x1));
-	  y1 += tmp;
+	  y1 += M(y2 - y1, D(xmin - x1, x2 - x1));
 	  x1 = xmin;
 	  Log(LDEBUG, "clipped against left to point (%d, %d), dy=%d/%d", x1 >> CPX, y1 >> CPX, tmp >> CPX, tmp);
 	}