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# https://joeldare.com/rounding-image-corners-with-imagemagick
rounded_corners()
{
local destdir height mask radius ratio subdir t0 width
destdir=$1; shift
mask=$(mktemp)
for subdir in ?x?; do
ratio=${subdir%x*}/${subdir#*x}
for height; do
width=$((height * $ratio))
radius=$((height / 10))
convert -size ${width}x${height} xc:none -draw \
"roundRectangle 0,0,$((width-1)),$((height-1)),$radius,$radius" \
-strip "png:$mask"
mkdir -p "$destdir/${width}x${height}"
echo -n "Generating flags ${width}x${height}... "
t0=$(date +%s)
for flag in $subdir/*.svg; do
convert -resize ${width}x${height} \
"$flag" -matte "$mask" \
-compose DstIn -composite -strip \
"$destdir/${width}x${height}/$(basename "$flag" svg)png"
done
echo "finished in $(date -ur $((`date +%s`-t0)) +%M:%S)"
done
done
rm "$mask"
}
"$@"
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