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#!/bin/sh
###############################################################################
# pamstretch-gen
###############################################################################
# A generalized version of pamstretch that can do non-integer scale factors.
#
# It works by scaling up with pamstretch then scaling down with pamscale.
#
# it also copes with N<1, but then it just uses pamscale. :-)
#
# Formerly named 'pnminterp-gen' and 'pnmstretch-gen'.
#
# Netpbm global options -quiet and -plain don't work (this should be fixed).
#
###############################################################################
if [ "$1" = "--version" -o "$1" = "-version" ]; then
pamstretch --version; exit $?;
fi
if [ "$1" = "" ]; then
echo 'usage: pamstretch-gen N [pnmfile]'
exit 1
fi
tempfile=$(mktemp "${TMPDIR:-/tmp}/netpbm.XXXXXXXX.pam")
if [ $? -ne 0 -o ! -e $tempfile ]; then
echo "Could not create temporary file. Exiting." 1>&2
exit 1
fi
trap 'rm -rf $tempfile' 0 1 3 15
if ! cat $2 | pampick -quiet 0 > $tempfile; then
echo 'pamstretch-gen: error reading file' 1>&2
exit 1
fi
# Calculate pamstretch scale factor (="iscale") and output width and
# height. Usually "int(scale) + 1" is sufficient for iscale but
# in some exceptional cases adjustment is necessary because of
# "-dropedge".
report=$(pamscale -reportonly $1 $tempfile)
if [ $? -ne 0 ]; then
echo "pamstretch-gen: pamscale does not support -reportonly" 1>&2
exit 1
fi
iscale_width_height=$(echo $report |\
awk 'NF!=6 || $1<=0 || $2<=0 || $3<=0 || $5<=0 || $6<=0 { exit 1 }
$3 > 1.0 { iscale = int($3) + 1;
if (iscale * ($1-1) < $5 || iscale * ($2-1) < $6 )
++iscale; }
{ iscale = 1 } # $3 <= 1.0
{ print iscale, "-width="$5, "-height="$6}' )
# Note that $1, $2, ..., $6 here are fields of the input line fed to awk,
# not shell positional parameters.
iscale=$(echo $iscale_width_height | cut -d " " -f 1)
if [ "$iscale" -eq 1 ]; then
pamscale "$1" $tempfile
else
width_height=$(echo $iscale_width_height | cut -d " " -f 2,3)
pamstretch -dropedge "$iscale" $tempfile |\
pamscale $width_height
fi
# Copyright (C) 1998,2000 Russell Marks.
# Modifications for "pamscale -reportonly" "pamstretch -dropedge" by
# Akira Urushibata (Jan. 2019)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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