61 lines
1.4 KiB
Bash
Executable File
61 lines
1.4 KiB
Bash
Executable File
#!/bin/sh
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# resize a 1000x1000 image to every size in [500,1000] with every interpolator
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# and check for black lines
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# see https://github.com/jcupitt/libvips/issues/131
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# set -x
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. ./variables.sh
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# make a 1000x1000 mono test image
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echo building test image ...
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vips extract_band $image $tmp/t1.v 1
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vips replicate $tmp/t1.v $tmp/t2.v 2 2
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vips extract_area $tmp/t2.v $tmp/t1.v 10 10 1000 1000
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# is a difference beyond a threshold? return 0 (meaning all ok) or 1 (meaning
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# error, or outside threshold)
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break_threshold() {
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diff=$1
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threshold=$2
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return $(echo "$diff > $threshold" | bc -l)
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}
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for interp in nearest bilinear bicubic lbb nohalo vsqbs; do
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size=1000
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while [ $size -gt 499 ]; do
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printf "testing $interp, size to $size ... "
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vipsthumbnail $tmp/t1.v -o $tmp/t2.v --size $size --interpolator $interp
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if [ $(vipsheader -f width $tmp/t2.v) -ne $size ]; then
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echo failed -- bad size
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exit
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fi
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if [ $(vipsheader -f height $tmp/t2.v) -ne $size ]; then
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echo failed -- bad size
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exit
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fi
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vips project $tmp/t2.v $tmp/cols.v $tmp/rows.v
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min=$(vips min $tmp/cols.v)
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if break_threshold $min 0; then
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echo failed -- has a black column
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exit
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fi
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min=$(vips min $tmp/rows.v)
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if break_threshold $min 0; then
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echo failed -- has a black row
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exit
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fi
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echo ok
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size=$(($size-1))
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done
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done
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