Script to convert a PDF or SVG into iOS and Android app icons for a Skip project

skip-mkicon.sh

#!/bin/sh -ex
# This script should be executed in the root of a Skip project
# It will convert the specified image source (typically a PDF)
# into all the required icons for the Darwin/ and Android/ versions
#
# Prerequisite: `brew install imagemagick`
#
# e.g.: skip.iconconvert.sh Sources/Showcase/Resources/Module.xcassets/skiplogo.imageset/skiplogo.pdf

which magick &> /dev/null || (echo "$(basename $0): error: magick command not found (install imagemagick)"; exit 1)

if [ -z "$1" ]; then
    echo "Usage: $(basename $0) SRC.pdf BGCOLOR"
    exit 1
fi

SRC=$1
BGCOLOR=${2:-"white"}

convert() {
    # Aetting the -density before the file name will help when rasterising
    # svg images and preventing pixalation.
    # It also (unintuitively) reduces the resulting .png file sizes.
    magick +antialias -density 2000 "${SRC}" -background "${BGCOLOR}" -define png:exclude-chunks=date,time -strip -flatten -resize "${@}"
}

convert 48x48 Android/app/src/main/res/mipmap-mdpi/ic_launcher.png
convert 72x72 Android/app/src/main/res/mipmap-hdpi/ic_launcher.png
convert 192x192 Android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
convert 144x144 Android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
convert 96x96 Android/app/src/main/res/mipmap-xhdpi/ic_launcher.png

convert 40x40 Darwin/Assets.xcassets/AppIcon.appiconset/[email protected]
convert 40x40 Darwin/Assets.xcassets/AppIcon.appiconset/AppIcon-20@2x~ipad.png
convert 60x60 Darwin/Assets.xcassets/AppIcon.appiconset/[email protected]
convert 20x20 Darwin/Assets.xcassets/AppIcon.appiconset/AppIcon-20~ipad.png
convert 29x29 Darwin/Assets.xcassets/AppIcon.appiconset/AppIcon-29.png
convert 58x58 Darwin/Assets.xcassets/AppIcon.appiconset/[email protected]
convert 58x58 Darwin/Assets.xcassets/AppIcon.appiconset/AppIcon-29@2x~ipad.png
convert 87x87 Darwin/Assets.xcassets/AppIcon.appiconset/[email protected]
convert 29x29 Darwin/Assets.xcassets/AppIcon.appiconset/AppIcon-29~ipad.png
convert 80x80 Darwin/Assets.xcassets/AppIcon.appiconset/[email protected]
convert 80x80 Darwin/Assets.xcassets/AppIcon.appiconset/AppIcon-40@2x~ipad.png
convert 120x120 Darwin/Assets.xcassets/AppIcon.appiconset/[email protected]
convert 40x40 Darwin/Assets.xcassets/AppIcon.appiconset/AppIcon-40~ipad.png
convert 167x167 Darwin/Assets.xcassets/AppIcon.appiconset/AppIcon-83.5@2x~ipad.png
convert 120x120 Darwin/Assets.xcassets/AppIcon.appiconset/[email protected]
convert 152x152 Darwin/Assets.xcassets/AppIcon.appiconset/AppIcon@2x~ipad.png
convert 180x180 Darwin/Assets.xcassets/AppIcon.appiconset/[email protected]
convert 1024x1024 Darwin/Assets.xcassets/AppIcon.appiconset/AppIcon~ios-marketing.png
convert 76x76 Darwin/Assets.xcassets/AppIcon.appiconset/AppIcon~ipad.png

# output the file sizes
du -skhc Android/app/src/main/res/*/*.png Darwin/Assets.xcassets/AppIcon.appiconset/*.png