resize-icon.bash

resize-icon.bash

#!/bin/bash

# https://stackoverflow.com/a/51343786
# https://developer.apple.com/library/archive/qa/qa1686/_index.html

RED='\033[0;31m'          # Red
GREEN='\033[0;32m'        # Green
RESET='\033[0m'       # Text Reset
function __system {
    echo -e $GREEN$*$RESET
}
function __error {
    echo -e $RED$*$RESET
}

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
PROJECT_DIR=$SCRIPT_DIR/..

OUTDIR="resized"
mkdir -p $OUTDIR
ICON=$1
if [[ -z $ICON ]]; then
  echo "Usage:"
  echo $0 "Icon-1024.png"
  exit 1
fi

function resize {
  POSTFIX=$1
  SIZE=$2
  MULTIPLIER=$3
  ACTUAL_SIZE=$(echo "$SIZE" '*' "$MULTIPLIER" | bc -l)

  SIZE_STR=$ACTUAL_SIZE'x'$ACTUAL_SIZE
  if [[ $MULTIPLIER -eq "1" ]]; then
    FILENAME='Icon-'$SIZE$POSTFIX'.png'
  else
    FILENAME='Icon-'$SIZE'@'$MULTIPLIER'x'$POSTFIX'.png'
  fi
  __system "Resizing $FILENAME..."
  convert $ICON -resize $SIZE_STR $OUTDIR/$FILENAME
}

# iPhone
resize '' 20 2
resize '' 20 3

resize '' 29 1
resize '' 29 2
resize '' 29 3

resize '' 40 2
resize '' 40 3

resize '' 60 2
resize '' 60 3

# iPad
resize '~ipad' 20 1
resize '~ipad' 20 2

resize '~ipad' 29 1
resize '~ipad' 29 2

resize '~ipad' 40 1
resize '~ipad' 40 2

resize '~ipad' 76 1
resize '~ipad' 76 2

resize '~ipad' 83.5 2

# App Store
resize '~ios-marketing' 1024 1

__system "Done"
__system "Output directory: $OUTDIR"
ls $OUTDIR