@3xイメージから各種サイズに変換するシェルスクリプト 9-patch化も

resize-assets.sh

#!/bin/sh

mkdir -p drawable-mdpi drawable-hdpi drawable-xhdpi drawable-xxhdpi

for name in foo bar; do
    convert -resize 216x116 "${name}@3x.png" "${name}@2x.png"
    convert -resize 162x87 "${name}@3x.png" "${name}@1.5x.png"
    convert -resize 108x58 "${name}@3x.png" "${name}.png"
    convert "${name}@3x.png" -background transparent -gravity northeast -splice 1x1 tmp.png
    convert tmp.png -background transparent -gravity southwest -splice 1x1 "drawable-xxhdpi/${name}.9.png"
    convert "${name}@2x.png" -background transparent -gravity northeast -splice 1x1 tmp.png
    convert tmp.png -background transparent -gravity southwest -splice 1x1 "drawable-xhdpi/${name}.9.png"
    convert "${name}@1.5x.png" -background transparent -gravity northeast -splice 1x1 tmp.png
    convert tmp.png -background transparent -gravity southwest -splice 1x1 "drawable-hdpi/${name}.9.png"
    convert "${name}.png" -background transparent -gravity northeast -splice 1x1 tmp.png
    convert tmp.png -background transparent -gravity southwest -splice 1x1 "drawable-mdpi/${name}.9.png"
done

for name in hoge fuga; do
    convert -resize 40x40 "${name}@3x.png" "${name}@2x.png"
    convert -resize 30x30 "${name}@3x.png" "${name}@1.5x.png"
    convert -resize 20x20 "${name}@3x.png" "${name}.png"
    cp "${name}@3x.png" "drawable-xxhdpi/${name}.png"
    cp "${name}@2x.png" "drawable-xhdpi/${name}.png"
    cp "${name}@1.5x.png" "drawable-hdpi/${name}.png"
    cp "${name}.png" "drawable-mdpi/${name}.png"
done

rm -v *@1.5x.png tmp.png