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#!/usr/bin/env python3
# ##### BEGIN GPL LICENSE BLOCK #####
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####
# This script is just to view the icons
def write_png(buf, width, height):
import zlib
import struct
# reverse the vertical line order and add null bytes at the start
width_byte_4 = width * 4
raw_data = b"".join(
b'\x00' + buf[span:span + width_byte_4]
for span in range((height - 1) * width * 4, -1, - width_byte_4)
)
def png_pack(png_tag, data):
chunk_head = png_tag + data
return struct.pack("!I", len(data)) + chunk_head + struct.pack("!I", 0xFFFFFFFF & zlib.crc32(chunk_head))
return b"".join([
b'\x89PNG\r\n\x1a\n',
png_pack(b'IHDR', struct.pack("!2I5B", width, height, 8, 6, 0, 0, 0)),
png_pack(b'IDAT', zlib.compress(raw_data, 9)),
png_pack(b'IEND', b'')])
def icondata_to_png(file_src, file_dst):
import struct
with open(file_src, 'rb') as f_src:
# 2 ints
temp_data = f_src.read(4 * 2)
w, h = struct.unpack('<2I', temp_data)
temp_data = f_src.read(4 * 2) # (x, y) - ignored
temp_data = f_src.read(4 * 2) # (xfrom, yfrom) - ignored
# pixels
temp_data = f_src.read(w * h * 4)
buf = write_png(temp_data, w, h)
with open(file_dst, 'wb') as f_dst:
f_dst.write(buf)
def main():
import sys
import os
for arg in sys.argv[1:]:
file_src = arg
file_dst = os.path.splitext(arg)[0] + ".png"
icondata_to_png(file_src, file_dst)
if __name__ == "__main__":
main()
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