Python script to create Xamarin Android Mipmap Resources from Image / Icon

resources.py

'''
  Copyright 2017, 2018, 2019 Captive Reality Ltd
  Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is 
  hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 
  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE
  FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 
  LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 
  ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  
  Source: https://gist.github.com/markcastle/492465d5ac16ff67e56bbcb09684d246
  Description: 
  Create Xamarin Android Mipmap Resources from Image / Icon
  
  Installation:
  You may need to install pip and then image like this...
  python -m pip install -U pip
  python -m pip install image
  
  Usage: 
  Drop the resources.py folder into the same folder as your source Icon then run with...
  python resources.py <SourceIconImageFile>
  
  eg...
  python resources.py ic_outbound.png
  
  This will then create folders such as
  
  Current Folder
    +-- 24px
         +-- ic_outbound.png
    +-- 32px
         +-- ic_outbound.png
    +-- 512px
         +-- ic_outbound.png
    +-- mipmap-hdpi
         +-- ic_outbound.png
    +-- mipmap-ldpi
         +-- ic_outbound.png
    +-- mipmap-mdpi
         +-- ic_outbound.png
    +-- mipmap-xhdpi
         +-- ic_outbound.png
    +-- mipmap-xxhdpi
         +-- ic_outbound.png
    +-- mipmap-xxxhdpi
         +-- ic_outbound.png

  You can now drop these into your mipmap folder in Xamarin :-)
  
'''


import os, sys
from PIL import Image

# Creates a folder in the current directory
# Example
# createFolder('./data/')
def createFolder(directory):
    try:
        if not os.path.exists(directory):
            os.makedirs(directory)
    except OSError:
        print ('Error: Creating directory. ' +  directory)

# Resize an image to 'size x size' and output the result in a named folder.
# Example
# resizeImage('mipmap-xxxhdpi', 192, infile)
def resizeImage(foldername, size, infile):
    # print ('Creating Folder...%s' % foldername)
    createFolder('./%s/' % foldername)
    outfile = './%s/%s' % (foldername, infile[0])
    # print ('outfile=%s' % outfile)
    outsize = size, size
    try:
        im = Image.open(infile[0])
        im.thumbnail(outsize, Image.ANTIALIAS)
        im.save(outfile, "png")
        print ('icon saved:%s' % outfile)
    except IOError:
        print ('cannot create image for %s size:%s' % infile)

infile = sys.argv[1:]

resizeImage('512px', 512, infile)
resizeImage('mipmap-xxxhdpi', 192, infile)
resizeImage('mipmap-xxhdpi', 144, infile)
resizeImage('mipmap-xhdpi', 96, infile)
resizeImage('mipmap-hdpi', 72, infile)
resizeImage('mipmap-mdpi', 48, infile)
resizeImage('mipmap-ldpi', 36, infile)
resizeImage('32px', 32, infile)
resizeImage('24px', 24, infile)