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