--- ray/src/px/normpat.csh	1991/01/03 18:01:36	1.1
+++ ray/src/px/normpat.csh	1991/01/04 12:05:59	1.2
@@ -1,19 +1,94 @@
 #!/bin/csh -f
 # SCCSid "$SunId$ LBL"
 #
-# Normalize a picture to make it suitable as a tiling pattern.
-# This script reduces the image and removes the lowest frequencies.
+# Normalize a pattern for tiling (-b option blends edges) by removing
+# lowest frequencies from image and reducing to standard size (-r option)
 #
+set pf="pfilt -e 2"
+while ($#argv > 0)
+	switch ($argv[1])
+	case -r:
+		shift argv
+		set pf="$pf -x $argv[1] -y $argv[1] -p 1"
+		breaksw
+	case -b:
+		set blend
+		breaksw
+	case -*:
+		echo bad option $argv[1]
+		exit 1
+	default:
+		goto dofiles
+	endsw
+	shift argv
+end
+dofiles:
+onintr quit
+set td=/usr/tmp/np$$
+mkdir $td
+set ha=$0
+set ha=$ha:t
+if ( $?blend ) then
+	set ha="$ha -b"
+else
+	mknod $td/hf p
+endif
 foreach f ($*)
-	pfilt -e 2 -x 128 -y 128 -p 1 $f > np$$
-	set resolu=`getinfo -d < np$$ | sed 's/-Y \([0-9]*\) +X \([0-9]*\)/\2 \1/'`
-	set coef=`pfilt -1 -x 32 -y 32 np$$ | pvalue -h -b | rcalc -e '$1=2*$3*cos(wx);$2=2*$3*cos(wy);$3=2*$3*sin(wx);$4=2*$3*sin(wy);$5=4*$3*cos(wx)*cos(wy);$6=4*$3*cos(wx)*sin(wy);$7=4*$3*sin(wx)*cos(wy);$8=4*$3*sin(wx)*sin(wy);' -e 'wx=2*PI/32*$1;wy=2*PI/32*$2' | total -m`
+	echo $f\:
+	echo adjusting size/exposure...
+	$pf $f > $td/pf
+	getinfo < $td/pf > $f
+	ed - $f << _EOF_
+i
+$ha
+.
+w
+q
+_EOF_
+	if ( ! $?blend ) then
+		getinfo - < $td/hf >> $f &
+	endif
+	set resolu=`getinfo -d < $td/pf | sed 's/-Y \([0-9]*\) +X \([0-9]*\)/\2 \1/'`
+	echo computing Fourier coefficients...
+	set coef=`pfilt -1 -x 32 -y 32 $td/pf | pvalue -h -b | rcalc -e '$1=2*$3*cos(wx);$2=2*$3*cos(wy);$3=2*$3*sin(wx);$4=2*$3*sin(wy);$5=4*$3*cos(wx)*cos(wy);$6=4*$3*cos(wx)*sin(wy);$7=4*$3*sin(wx)*cos(wy);$8=4*$3*sin(wx)*sin(wy);' -e 'wx=2*PI/32*$1;wy=2*PI/32*$2' | total -m`
+	echo "cosx cosy sinx siny"
+	echo $coef[1-4]
+	echo "cosx*cosy cosx*siny sinx*cosy sinx*siny"
+	echo $coef[5-8]
+	echo removing low frequencies...
 	pcomb -e 'ro=ri(1)*f;go=gi(1)*f;bo=bi(1)*f;f=1-fc-fs-f0-f1' \
 		-e "fc=$coef[1]*cos(wx)+$coef[2]*cos(wy)" \
 		-e "fs=$coef[3]*sin(wx)+$coef[4]*sin(wy)" \
 		-e "f0=$coef[5]*cos(wx)*cos(wy)+$coef[6]*cos(wx)*sin(wy)" \
 		-e "f1=$coef[7]*sin(wx)*cos(wy)+$coef[8]*sin(wx)*sin(wy)" \
 		-e "wx=2*3.1416/$resolu[1]*x;wy=2*3.1416/$resolu[2]*y" \
-		np$$ > $f
-	rm np$$
+		$td/pf > $td/hf
+	if ( $?blend ) then
+		echo blending edges...
+		@ mar= $resolu[1] - 3
+		pcompos -x 3 $td/hf 0 0 > $td/left
+		pcompos $td/hf -$mar 0 > $td/right
+		pcomb -e 'ro=f(ri);go=f(gi);bo=f(bi)' \
+			-e 'f(p)=(3-x)/7*p(1)+(4+x)/7*p(2)' \
+			$td/right $td/left > $td/left.patch
+		pcomb -e 'ro=f(ri);go=f(gi);bo=f(bi)' \
+			-e 'f(p)=(1+x)/7*p(1)+(6-x)/7*p(2)' \
+			$td/left $td/right > $td/right.patch
+		pcompos $td/hf 0 0 $td/left.patch 0 0 $td/right.patch $mar 0 \
+			> $td/hflr
+		@ mar= $resolu[2] - 3
+		pcompos -y 3 $td/hflr 0 0 > $td/bottom
+		pcompos $td/hflr 0 -$mar > $td/top
+		pcomb -e 'ro=f(ri);go=f(gi);bo=f(bi)' \
+			-e 'f(p)=(3-y)/7*p(1)+(4+y)/7*p(2)' \
+			$td/top $td/bottom > $td/bottom.patch
+		pcomb -e 'ro=f(ri);go=f(gi);bo=f(bi)' \
+			-e 'f(p)=(1+y)/7*p(1)+(6-y)/7*p(2)' \
+			$td/bottom $td/top > $td/top.patch
+		pcompos $td/hflr 0 0 $td/bottom.patch 0 0 $td/top.patch 0 $mar \
+			| getinfo - >> $f
+	endif
+	echo $f done.
 end
+quit:
+rm -rf $td