69 lines
1.6 KiB
Bash
Executable File
69 lines
1.6 KiB
Bash
Executable File
#!/bin/sh
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# resize a 1000x1000 image to every size in [100,1000], check for black
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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 ... add a bit so the image should not
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# contain any zeros, helps to spot missing tiles and bad pixels
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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 linear $tmp/t1.v $tmp/t2.v 1 20 --uchar
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vips replicate $tmp/t2.v $tmp/t1.v 2 2
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vips crop $tmp/t1.v $tmp/t2.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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size=1000
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while [ $size -gt 99 ]; do
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printf "testing size to $size ... "
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vipsthumbnail $tmp/t2.v -o $tmp/t1.v --size $size
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if [ $(vipsheader -f width $tmp/t1.v) -ne $size ]; then
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echo $tmp/t1.v failed -- bad size
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echo output width is $(vipsheader -f width $tmp/t1.v)
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exit
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fi
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if [ $(vipsheader -f height $tmp/t1.v) -ne $size ]; then
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echo $tmp/t1.v failed -- bad size
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echo output height is $(vipsheader -f width $tmp/t1.v)
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exit
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fi
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vips project $tmp/t1.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 $tmp/t1.v failed -- has a black column
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exit
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fi
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min=$(vips min $tmp/rows.v)
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if break_threshold $min 0; then
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echo $tmp/t1.v failed -- has a black row
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exit
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fi
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min=$(vips min $tmp/t1.v)
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if break_threshold $min 0; then
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echo $tmp/t1.v failed -- has black pixels
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exit
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fi
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echo ok
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size=$(($size-1))
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done
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