1 files changed, 117 insertions, 0 deletions
diff --git a/pkg/images/tv/display/iiswnd.x b/pkg/images/tv/display/iiswnd.x
new file mode 100644
index 00000000..e906cc1f
--- /dev/null
+++ b/pkg/images/tv/display/iiswnd.x
@@ -0,0 +1,117 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <mach.h>
+include "zdisplay.h"
+include "iis.h"
+
+# IISWND -- Window IIS display frame with the trackball.
+
+procedure iiswnd3 (chan1, chan2, chan3)
+
+int	chan1[ARB], chan2[ARB], chan3[ARB]
+
+int	i, j
+real	x, y
+short	lut[LEN_LUT]
+int	status, xcur, ycur, lutval
+int	iisflu(), and()
+
+begin
+	if (iisflu(chan1) == GRCHAN)
+	    return
+	call iisrlt (chan1, lut)
+
+	# Starting point at lut[2] because lut[1] is background
+	for (i=3;  (i < 257) && (lut[i] == lut[2]);  i=i+1)
+	    ; 		
+	i = i - 1
+
+	for (j=255;  (j > i) && (lut[j] == lut[256]);  j=j-1)
+	    ; 
+	j = j + 1
+
+	if ((i == j) || (lut[i] == lut[j])) {
+	    xcur = 256
+	    ycur = 384
+	} else {
+	    y = real (lut[j] - lut[i]) / (j - i)
+	    xcur = 2 * (i - 1) - (2 * lut[i] - 256) / y + 1
+	    if (y > 1)
+		y = 2 - (1 / y)
+	    if (y < -1)
+		y = -2 - (1 / y)
+	    ycur = 128 * y + 256.5
+	}
+
+	xcur = xcur * MCXSCALE
+	ycur = ycur * MCYSCALE
+	call iiswcr (status, xcur, ycur)
+	status = 0
+
+	while (and (status, PUSH) == 0) {
+	    call iisrcr (status, xcur, ycur)
+	    if (status == EOF)
+		break
+
+	    xcur = xcur / MCXSCALE
+	    ycur = ycur / MCYSCALE
+	    x = xcur / 2
+	    y = (ycur - 255.5) / 128.
+
+	    if (y > 1)
+		y = 1. / (2 - y)
+	    if (y < - 1)
+		y = -1. / (2 + y)
+	    do i = 1, 256 {
+		lutval = y * (i - 1 - x) + 127.5
+		lut[i] = max (0, min (255, lutval))
+	    }
+
+	    lut[1] = 0			# Make background black
+	    if ((chan1[1] == chan2[1]) && (chan1[1] == chan3[1]))
+	        call iiswlt (chan1, lut)
+	    else {
+		call iiswlt (chan1, lut)
+		call iiswlt (chan2, lut)
+		call iiswlt (chan3, lut)
+	    }
+	}
+end
+
+
+# IISWLT -- Write monochrome look up table.
+
+procedure iiswlt (chan, lut)
+
+int	chan[ARB]
+short	lut[ARB]
+
+int	status
+int	iisflu()
+
+begin
+	if (iisflu (chan) == GRCHAN)
+	    return
+	call iishdr (IWRITE+VRETRACE, LEN_LUT, LUT, ADVXONTC, 0, chan[2],
+	    iisflu (chan))
+	call iisio (lut, LEN_LUT * SZB_CHAR, status)
+end
+
+
+# IISRLT -- Read monochrome look up table.
+
+procedure iisrlt (chan, lut)
+
+int	chan[ARB]
+short	lut[ARB]
+
+int	status
+int	iisflu()
+
+begin
+	if (iisflu (chan) == GRCHAN)
+	    return
+	call iishdr (IREAD+VRETRACE, LEN_LUT, LUT, ADVXONTC, 0, 0,
+	    iisflu (chan))
+	call iisio (lut, LEN_LUT * SZB_CHAR, status)
+end