Walnut App Icon Embed

make-walnut-icon.py

import os
import sys

def make_embed(in_png_file, out_file_name):

    with open(in_png_file, "rb") as file:
        png_data = file.read()

    with open(out_file_name, "w") as file:
        file.write("const uint8_t g_WalnutIcon[] =\n{\n")

        count = 0
        length = len(png_data)

        for index in range(length):
            byte = png_data[index]
            file.write(f'0x{byte:02X}')

            if index == length - 1:
                break

            count = count + 1

            if count < 16:
                file.write(', ')
            else:
                file.write(',\n')
                count = 0

        file.write("\n};")
        print(f'Wrote {length} bytes to {out_file_name}')

def usage():
    print("usage: python make-walnut-icon.py [path-to-png-file]")

def main():
    arg_count = len(sys.argv)

    if (arg_count != 2):
        usage()
        return

    in_png_file = sys.argv[1]

    if not os.path.exists(in_png_file):
        print(f'{in_png_file} does not exist.')
        return

    out_file_name = 'Walnut-Icon.embed'
    make_embed(in_png_file, out_file_name)

if __name__ == "__main__":
    main()