external/potrace/check/mkbitmap-check.sh
#! /bin/sh

# Copyright (C) 2001-2019 Peter Selinger.
# This file is part of Potrace. It is free software and it is covered
# by the GNU General Public License. See the file COPYING for details.

echo "Checking mkbitmap..." >& 2

# because of floating point inaccuracies, we cannot check that the
# output is identical to its reference; instead, we compare pixmaps
# and allow for small differences.

if test -z "$srcdir"; then
    srcdir=.
fi

. "$srcdir/missing.sh"

NAME=`basename "$0"`

MKBITMAP="${CHECK_MKBITMAP:-../src/mkbitmap$EXEEXT}"
DATADIR="$srcdir/data"
PGMDIFF="./pgmdiff$EXEEXT"
TMPDIR="${TEMPDIR:-/tmp}"
TMP1=`mktemp "$TMPDIR/$NAME-1.XXXXXX"`
DATA="$DATADIR/data2.ppm"
REFDATA1="$DATADIR/data2-out1.pbm"
REFDATA2="$DATADIR/data2-out2.pbm"

action () {
    "$@"
    if test $? -ne 0; then
	echo "$NAME: test failed" >& 2
	echo "Failed command: $LINE: $@" >& 2
	exit 1
    fi
}

actiondiff () {
    D=`action "$PGMDIFF" "$1" "$2"`
    # check return value because subshell can't exit
    if test $? -ne 0; then 
	exit 1; 
    fi
    echo "Difference: $D" >& 2
    if test "$D" -gt "$3"; then
	echo "$NAME: test failed" >& 2
	echo "Failed command: $LINE: $PGMDIFF $1 $2" >& 2
	exit 1;
    fi
}

# keep track of line numbers
alias action="LINE=\$LINENO; action"
alias actiondiff="LINE=\$LINENO; actiondiff"

action $MKBITMAP -f2 -s2 -t.48 -o "$TMP1" "$DATA"
actiondiff "$TMP1" "$REFDATA1" 50

action $MKBITMAP -f1 -s2 -t.54 -1 -i -o "$TMP1" "$DATA"
actiondiff "$TMP1" "$REFDATA2" 50

action rm -f "$TMP1"

echo "$NAME: test succeeded" >& 2
exit 0
