Concat cubemap slices into one big image with 4:3 aspect ratio

fitcube.py

#!/usr/bin/env python

from email.mime import image
import os
import sys
from PIL import Image

def main():
    canvas = None # type: Image
    data = [(2,1),(0,1),(1,0),(1,2),(1,1),(3,1)]
    size = (0, 0)
    dir = '.'
    for n, name in enumerate(sys.argv[1:]):
        print(n, name)
        slice = Image.open(name)
        if not canvas:
            size = slice.size[0], slice.size[0]
            dir = os.path.dirname(os.path.abspath(name))
            canvas = Image.new('RGB', size=(size[0]*4, size[1]*3))
        if size != slice.size:
            slice = slice.resize(size=size, resample=Image.Resampling.BICUBIC)
        slot = data[n]
        canvas.paste(slice, (slot[0]*size[0],slot[1]*size[1]))
        if n >= 6: break
    if not canvas: raise Exception('invalid arguments: {}'.format(sys.argv[1:]))
    filename = os.path.join(dir, 'cubemap.tga')
    canvas.save(filename)
    print('>> {}'.format(filename))

if __name__ == '__main__': main()