libvips/test/test_cli.sh

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#!/bin/sh
# this test is also in test_resample.py (though much smaller and neater) ...
# keep this test to exercise the cli interface
# set -x
. ./variables.sh
# is a difference beyond a threshold? return 0 (meaning all ok) or 1 (meaning
# error, or outside threshold)
#
# use bc since bash does not support fp math
break_threshold() {
diff=$1
threshold=$2
return $(echo "$diff <= $threshold" | bc -l)
}
# subtract, look for max difference less than a threshold
test_difference() {
before=$1
after=$2
threshold=$3
$vips subtract $before $after $tmp/difference.v
$vips abs $tmp/difference.v $tmp/abs.v
dif=$($vips max $tmp/abs.v)
if break_threshold $dif $threshold; then
echo "difference is $dif"
exit 1
fi
}
test_rotate() {
im=$1
inter=$2
printf "testing $inter ... "
# 90 degree clockwise rotate
trn="0 1 1 0"
$vips affine $im $tmp/t1.v "$trn" --interpolate $inter
$vips affine $tmp/t1.v $tmp/t2.v "$trn" --interpolate $inter
$vips affine $tmp/t2.v $tmp/t1.v "$trn" --interpolate $inter
$vips affine $tmp/t1.v $tmp/t2.v "$trn" --interpolate $inter
test_difference $im $tmp/t2.v 1
echo "ok"
}
# vsqbs is non-interpolatory, don't test this way
echo "testing with $(basename $image)"
for i in nearest bicubic bilinear nohalo lbb; do
test_rotate $image $i
done