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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<gio.h>
+
+# GGCELL -- Get a cell array, i.e., a two dimensional array of pixels.  If the
+# resolution of the graphics device does not match that of the cell array the
+# kernel is expected to compute the coordinates of each cell array pixel in 
+# device coordinates and return the value of the nearest device pixel as the
+# cell array value.  This equates to either subsampling or block replication
+# depending on the relative scale of the two devices.  See put cell array for
+# additional information.
+
+procedure ggcell (gp, m, nx, ny, x1, y1, x2, y2)
+
+pointer	gp			# device descriptor
+int	nx, ny			# size of pixel array
+short	m[nx,ny]		# pixels
+real	x1, y1			# lower left corner of input window
+real	x2, y2			# upper right corner of input window
+
+real	dy
+int	ly1, ly2, i
+int	sx1, sx2, sy1, sy2
+include	"gpl.com"
+
+begin
+	# Flush any buffered polyline output.  Make sure the wcs transformation
+	# in the cache is up to date.
+
+	if (op > 1)
+	    call gpl_flush()
+	else if (gp != gp_out || GP_WCS(gp) != wcs)
+	    call gpl_cache (gp)
+
+	# Transform cell window to GKI coordinates.  The coordinate
+	# transformation must be linear.
+
+	sx1 = (x1 - wxorigin) * xscale + mxorigin
+	sx2 = (x2 - wxorigin) * xscale + mxorigin
+	sy1 = (y1 - wyorigin) * yscale + myorigin
+	sy2 = (y2 - wyorigin) * yscale + myorigin
+
+	dy = real (sy2 - sy1) / ny	# height of a line in GKI coords
+
+	# Read the cell array into M, one line at a time.  Take care that the
+	# GKI integer value of ly1 of one line is the same as the ly2 value
+	# of the previous line, or there will be a blank line in the output
+	# image.
+
+	do i = 1, ny {
+	    ly1 = (i-1) * dy + sy1
+	    ly2 = (i  ) * dy + sy1
+	    call gki_getcellarray (GP_FD(gp), m[1,i], nx,1, sx1,ly1, sx2,ly2)
+	}
+end