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top_srcdir=@abs_top_srcdir@
top_builddir=@abs_top_builddir@
PYTHON=@PYTHON@
# we need a different tmp for each script since make can run tests in parallel
tmp=$top_builddir/test/tmp-$$
test_images=$top_srcdir/test/test-suite/images
image=$test_images/sample.jpg
mkdir -p $tmp
vips=$top_builddir/tools/vips
vipsthumbnail=$top_builddir/tools/vipsthumbnail
vipsheader=$top_builddir/tools/vipsheader
# we need bc to use '.' for a decimal separator
export LC_NUMERIC=C
# raspbian sets this too, annoyingly
unset LC_ALL
# test for file format supported
test_supported() {
format=$1
if $vips $format > /dev/null 2>&1; then
result=0
else
echo "support for $format not configured, skipping test"
result=1
fi
return $result
}
# 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
if ! command -v bc >/dev/null; then
exit 77
fi
return $(echo "$diff <= $threshold" | bc -l)
}
# subtract, look for max difference less than a threshold
test_difference() {
before=$1
after=$2
threshold=$3
# compare in srgb space
$vips colourspace $before $tmp/b-rgb.v srgb
$vips colourspace $after $tmp/a-rgb.v srgb
$vips subtract $tmp/b-rgb.v $tmp/a-rgb.v $tmp/difference.v
$vips abs $tmp/difference.v $tmp/abs.v
dif=$($vips max $tmp/abs.v)
if break_threshold $dif $threshold; then
echo "save / load difference is $dif"
exit 1
fi
}
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