#!/bin/csh -f
# SCCSid "$SunId$ LBL"
#
# 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 -v:
		set verb
		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
cat > $td/coef.fmt << '_EOF_'
  rcx=${   $1   };   rcy=${   $2   };   rsx=${   $3   };   rsy=${   $4   };
rcxcy=${   $5   }; rcxsy=${   $6   }; rsxcy=${   $7   }; rsxsy=${   $8   };
  gcx=${   $9   };   gcy=${  $10   };   gsx=${  $11   };   gsy=${  $12   };
gcxcy=${  $13   }; gcxsy=${  $14   }; gsxcy=${  $15   }; gsxsy=${  $16   };
  bcx=${  $17   };   bcy=${  $18   };   bsx=${  $19   };   bsy=${  $20   };
bcxcy=${  $21   }; bcxsy=${  $22   }; bsxcy=${  $23   }; bsxsy=${  $24   };
'_EOF_'
cat > $td/coef.cal << '_EOF_'
$1=$3*2*cx; $2=$3*2*cy; $3=$3*2*sx; $4=$3*2*sy;
$5=$3*4*cx*cy; $6=$3*4*cx*sy; $7=$3*4*sx*cy; $8=$3*4*sx*sy;
$9=$4*2*cx; $10=$4*2*cy; $11=$4*2*sx; $12=$4*2*sy;
$13=$4*4*cx*cy; $14=$4*4*cx*sy; $15=$4*4*sx*cy; $16=$4*4*sx*sy;
$17=$5*2*cx; $18=$5*2*cy; $19=$5*2*sx; $20=$5*2*sy;
$21=$5*4*cx*cy; $22=$5*4*cx*sy; $23=$5*4*sx*cy; $24=$5*4*sx*sy;
cx=cos(wx); cy=cos(wy);
sx=sin(wx); sy=sin(wy);
wx=2*PI*($1+.5)/xres; wy=2*PI*($2+.5)/yres;
'_EOF_'
cat > $td/fsub.cal << '_EOF_'
ro=ri(1)-rcx*cx-rcy*cy-rsx*sx-rsy*sy
	-rcxcy*cx*cy-rcxsy*cx*sy-rsxcy*sx*cy-rsxsy*sx*sy;
go=gi(1)-gcx*cx-gcy*cy-gsx*sx-gsy*sy
	-gcxcy*cx*cy-gcxsy*cx*sy-gsxcy*sx*cy-gsxsy*sx*sy;
bo=bi(1)-bcx*cx-bcy*cy-bsx*sx-bsy*sy
	-bcxcy*cx*cy-bcxsy*cx*sy-bsxcy*sx*cy-bsxsy*sx*sy;
cx=cos(wx); cy=cos(wy);
sx=sin(wx); sy=sin(wy);
wx=2*PI*(x+.5)/xres; wy=2*PI*(y+.5)/yres;
PI=3.14159265358979323846;
'_EOF_'
foreach f ($*)
	if ( $?verb ) then
		echo $f\:
		echo adjusting exposure/size...
	endif
	$pf $f > $td/pf
	getinfo < $td/pf > $f
	ed - $f << _EOF_
i
$ha
.
w
q
_EOF_
	set resolu=`getinfo -d < $td/pf | sed 's/-Y \([0-9]*\) +X \([0-9]*\)/\2 \1/'`
	if ( $?verb ) then
		echo computing Fourier coefficients...
	endif
	pfilt -1 -x 32 -y 32 $td/pf | pvalue -h \
		| rcalc -f $td/coef.cal -e 'xres=32;yres=32' \
		| total -m | rcalc -o $td/coef.fmt \
		> $td/coef
	if ( $?verb ) then
		cat $td/coef
		echo removing low frequencies...
	endif
	if ( ! $?blend ) then
		( getinfo - < $td/hf >> $f & ) > /dev/null
	endif
	pcomb -f $td/fsub.cal -f $td/coef \
		-e "xres=$resolu[1];yres=$resolu[2]" \
		$td/pf > $td/hf
	if ( $?blend ) then
		if ( $?verb ) then
			echo blending edges...
		endif
		@ 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
	if ( $?verb ) then
		echo $f done.
	endif
end
quit:
rm -rf $td