resize_atlas.py

# builtin imports
import argparse
from pathlib import Path
from math import ceil

# 3d Party imports
import deftree
from PIL import Image


def get_all_images(atlas_root):
    return [image.get_attribute("image").value for image in atlas_root.elements("images")]


def scale_image(image, percent):
    img = Image.open(image)
    new_width = ceil(img.width * (percent/100))
    width_percent = (new_width/float(img.size[0]))
    new_height = int((float(img.size[1])*float(width_percent)))
    img = img.resize((new_width, new_height), Image.ANTIALIAS)
    img.save(image)


def main(argument_style):
    args = argument_style()
    root_path = args.root
    atlas_path = args.atlas
    percent = args.percent
    if not root_path or not atlas_path or not percent:
        print_help()
        return
    tree = deftree.parse(atlas_path)
    root = tree.get_root()
    for image in get_all_images(root):
        path = Path(root_path) / image[1:]
        scale_image(path, percent)


def _parser():
    parser = argparse.ArgumentParser(description='Commandline tool to scale atlases')
    parser.add_argument('-r', '--root', dest='root', )
    parser.add_argument('-a', '--atlas', dest='atlas')
    parser.add_argument('-p', '--percent', dest='percent', type=int)
    return parser


def arguments():
    parser = _parser()
    input_args = parser.parse_args()
    return input_args


def mock_up():
    parser = _parser()
    input_args = parser.parse_args(['--root', 'test/repo', '-a', 'test/repo/assets/atlases/avatars.atlas', "-p", "90"])
    return input_args


def print_help():
    print("Usage: python resize_atlas.py -r 'project/root/' -a 'project/root/game.atlas' -p 10\n")
    print("The arguments are:")
    print("    --root (-r)     Root the the project")
    print("    --atlas (-a)    Atlas that we should resize the images of")
    print("    --percent (-p)  The new size in percent (90 will resave the image at 90%)")


if __name__ == '__main__':
    main(arguments)