1 files changed, 68 insertions, 0 deletions
diff --git a/pkg/images/tv/iis/iism70/iissplit.x b/pkg/images/tv/iis/iism70/iissplit.x
new file mode 100644
index 00000000..2badb7cb
--- /dev/null
+++ b/pkg/images/tv/iis/iism70/iissplit.x
@@ -0,0 +1,68 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <mach.h>
+include "iis.h"
+include "../lib/ids.h"
+
+define	X_SPLIT	12
+
+# IISSPLIT -- Read and Write split screen coordinates
+
+procedure iissplit (rw, n, data)
+
+short	rw			# read or write
+short	n			# number of data values
+short	data[ARB]		# the data
+
+int	command,len,x
+short	coord[2]
+
+include "iis.com"
+
+begin
+	len = min (int(n), 2)
+	if ( len < 1) {
+	    data[1] = IDS_EOD
+	    return
+	}
+
+	if (rw == IDS_WRITE) {
+	    if (data[1] == IDS_EOD)
+	        return
+	    command = IWRITE+VRETRACE
+	    coord[1] = data[1] / MCXSCALE
+
+
+	    # Split screen will display the full screen from one lut ONLY
+	    # if the split coordinate is zero.  Setting the split to 511
+	    # means that all the screen BUT the last pixel is from one lut.
+	    # Hence the y coordinate for full screen in one quad is 
+	    # (device) 0 , (user) 511.  If the user requests split at (0,0),
+	    # we honor this as a (device) (0,0).  This will remove the
+	    # ability to split the screen with just the bottom line
+	    # in the "other" lut, which shouldn't bother anyone.
+
+	    if (len == 2)
+		coord[2] = (IIS_YDIM - 1) - data[2]/MCYSCALE
+
+	    if (coord[2] == IIS_YDIM - 1)
+		coord[2] = 0
+
+	} else
+	    command = IREAD+VRETRACE
+
+	# at most, read/write the x,y registers
+	x = X_SPLIT + ADVXONTC
+
+	call iishdr (command, len, LUT+COMMAND, x, 0, 0, 0)
+	call iisio (coord, len * SZB_CHAR)
+
+	if ( rw != IDS_WRITE ) {
+	    data[1] = coord[1] * MCXSCALE
+	    if ( len == 2 ) {
+		if ( coord[2] == 0)
+		    coord[2] = IIS_YDIM - 1
+		data[2] = (IIS_YDIM - 1 - coord[2] ) * MCYSCALE
+	    }
+	}
+end