ref: ff3a9a5f3822d54c95e0534195c9155f8e46f229
dir: /textscreen/fonts/convert-font/
#!/usr/bin/env python3
#
# 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])