#!/bin/bash -eu

# Force this to the working directory
cd "$(dirname "$0")"

if which convert > /dev/null; then
  echo "Converting..."
else
  echo "Please install ImageMagic."
  exit 1
fi

# Note: Look into filters (http://www.imagemagick.org/script/command-line-options.php?#filter)

rm -f ./*.png

# Render the SVG into a big PNG
convert -density 1200 -background none pivot-logo.svg -resize 1024x1024 pivot-logo-1024.png
convert -density 1200 -background none pivot-logo.svg -resize 800x800   pivot-logo-800.png

# Down size the large PNG into other sizes
# Gamma correction from: http://www.4p8.com/eric.brasseur/gamma.html
# Thank you to Xavier Léauté (https://github.com/xvrl) for pointing it out.
convert pivot-logo-1024.png -depth 16 -gamma 0.454545 -resize 512x512 -gamma 2.2 -depth 8 pivot-logo-512.png
convert pivot-logo-1024.png -depth 16 -gamma 0.454545 -resize 128x128 -gamma 2.2 -depth 8 pivot-logo-128.png
convert pivot-logo-1024.png -depth 16 -gamma 0.454545 -resize 64x64   -gamma 2.2 -depth 8 pivot-logo-64.png
convert pivot-logo-1024.png -depth 16 -gamma 0.454545 -resize 32x32   -gamma 2.2 -depth 8 pivot-logo-32.png

echo "Done"