ref: 1c828b08d37d33e4a7448b7c403efcc2ad50c12d
dir: /textscreen/fonts/convert-font/
#!/usr/bin/env python # # Copyright(C) 2016 Simon Howard # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # as published by the Free Software Foundation; either version 2 # of the License, or (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # # Converts images into libtextscreen fonts. # import sys import os import re GRID_COLUMNS = 16 GRID_ROWS = 16 try: import Image except ImportError: try: from PIL import Image except ImportError: print("WARNING: Could not update %s. " "Please install the Python Imaging library or Pillow." % sys.argv[3]) sys.exit(0) def generate_font_data(filename): """Read font data from the given file. Args: filename: Image file to read. Returns: Tuple containing: (width, height) dimensions of each font character. Array of byte data for font. """ im = Image.open(filename) width, height = im.size assert (width % GRID_COLUMNS) == 0 assert (height % GRID_ROWS) == 0 char_w, char_h = width // GRID_COLUMNS, height // GRID_ROWS font_data_len = (width * height) // 8 font_data = [0] * font_data_len for y in range(height): for x in range(width): px = im.getpixel((x, y)) if px > (127, 127, 127): char_x, char_y = x // char_w, y // char_h x1, y1 = x % char_w, y % char_h bit_index = ( (char_y * GRID_COLUMNS + char_x) * (char_w * char_h) + (y1 * char_w) + x1) font_data[bit_index // 8] |= 1 << (bit_index % 8) return (char_w, char_h), font_data def convert_image(font_prefix, filename, output_filename): """Convert the given image to a text output file. Args: font_prefix: Prefix string to attach to constants. filename: Input image file to read. output_filename: Header file to write. """ dimensions, data = generate_font_data(filename) with open(output_filename, "w") as outfile: outfile.write("/* Font data generated from %s; do not edit.\n" " Please see textscreen/fonts/README for copyright\n" " information. */\n\n" % filename) outfile.write("static const uint8_t %s_font_data[] =\n{\n" % font_prefix) for index, b in enumerate(data): if (index % 8) == 0: outfile.write(" ") outfile.write("0x%02x," % b) if ((index + 1) % 8) == 0: outfile.write("\n") else: outfile.write(" ") outfile.write("};\n") outfile.write("\n") outfile.write("static const txt_font_t %s_font =\n{\n" % font_prefix) outfile.write(" \"%s\", %s_font_data, %d, %d,\n" % ( font_prefix, font_prefix, dimensions[0], dimensions[1])) outfile.write("};\n") convert_image(sys.argv[1], sys.argv[2], sys.argv[3])