atasciipng.py

#!/usr/bin/env python3
""" Render ATASCII text as a PNG graphic

Copyright 2020 Randy Gill

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""

import sys
import argparse
import zlib
import pickle
import base64
import png


def main():
    """ Process command line arguments and render ATASCII text as a PNG graphic """

    parser = argparse.ArgumentParser(
        description="Utility that renders an ATASCII text file as a PNG graphic, with native Atari 8-bit font."
    )
    parser.add_argument(
        dest="infile",
        type=argparse.FileType("rb"),
        help="Name of file containing ATASCII text"
    )
    parser.add_argument(
        dest="outfile",
        type=argparse.FileType("wb"),
        help="Name of PNG file to create"
    )

    args = parser.parse_args()

    compressed_char_data = base64.decodebytes(bytes(CHARACTER_SET_DATA, encoding="ascii"))
    pickled_char_data = zlib.decompress(compressed_char_data)
    char_data = pickle.loads(pickled_char_data)

    source_lines = args.infile.read().rstrip(b"\x9b").split(b"\x9b")
    args.infile.close()

    png_width = 8 * max([len(line) for line in source_lines])
    png_height = len(source_lines) * 8

    pixels = []
    for i in range(png_height):
        pixels.append([0] * png_width)

    pixel_y = 0
    for source_line in source_lines:
        for scan_line in range(8):
            pixel_x = 0
            for source_byte in source_line:
                char_line_pixels = char_data[source_byte][scan_line]
                for pixel in char_line_pixels:
                    pixels[pixel_y][pixel_x] = pixel
                    pixel_x += 1
            pixel_y += 1

    png_writer =  png.Writer(png_width, png_height, greyscale=True, bitdepth=1)
    png_writer.write(args.outfile, pixels)
    args.outfile.close()

CHARACTER_SET_DATA = """
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"""
if __name__ == "__main__":
    main()