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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-or-later
# <pep8 compliant>
_IS_BIG_ENDIAN = (__import__("sys").byteorder != 'little')
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 icon_decode_head(f_src):
import struct
# 2 ints
temp_data = f_src.read(4 * 2)
icon_w, icon_h = struct.unpack('<2I', temp_data)
temp_data = f_src.read(4 * 2)
orig_x, orig_y = struct.unpack('<2I', temp_data)
temp_data = f_src.read(4 * 2)
canvas_w, canvas_h = struct.unpack('<2I', temp_data)
return (icon_w, icon_h,
orig_x, orig_y,
canvas_w, canvas_h)
def icon_decode(f_src):
head = icon_decode_head(f_src)
(icon_w, icon_h,
orig_x, orig_y,
canvas_w, canvas_h) = head
# pixels
import array
pixels = f_src.read(icon_w * icon_h * 4)
pixels = array.array('I', pixels)
if _IS_BIG_ENDIAN:
pixels.byteswap()
return head, pixels
def icon_read(file_src):
with open(file_src, 'rb') as f_src:
head, pixels = icon_decode(f_src)
return head, pixels
def icon_merge(file_src, pixels_canvas, canvas_w, canvas_h):
""" Takes an icon filepath and merges into a pixel array
"""
head, pixels = icon_read(file_src)
(icon_w, icon_h,
orig_x, orig_y,
w_canvas_test, h_canvas_test) = head
assert(w_canvas_test == canvas_w)
assert(h_canvas_test == canvas_h)
for x in range(icon_w):
for y in range(icon_h):
# get pixel
pixel = pixels[(y * icon_w) + x]
# set pixel
dst_x = orig_x + x
dst_y = orig_y + y
pixels_canvas[(dst_y * canvas_w) + dst_x] = pixel
def icondir_to_png(path_src, file_dst):
""" Takes a path full of 'dat' files and writes out
"""
import os
import array
files = [os.path.join(path_src, f) for f in os.listdir(path_src) if f.endswith(".dat")]
# First check if we need to bother.
if os.path.exists(file_dst):
dst_time = os.path.getmtime(file_dst)
has_newer = False
for f in files:
if os.path.getmtime(f) > dst_time:
has_newer = True
break
if not has_newer:
return
with open(files[0], 'rb') as f_src:
(icon_w, icon_h,
orig_x, orig_y,
canvas_w, canvas_h) = icon_decode_head(f_src)
# load in pixel data
pixels_canvas = array.array('I', [0]) * (canvas_w * canvas_h)
for f in files:
icon_merge(f, pixels_canvas, canvas_w, canvas_h)
# write pixels
with open(file_dst, 'wb') as f_dst:
pixels_data = pixels_canvas.tobytes()
image_data = write_png(pixels_data, canvas_w, canvas_h)
f_dst.write(image_data)
def main_ex(argv):
import os
path_src = argv[-2].rstrip(os.sep)
file_dst = argv[-1]
icondir_to_png(path_src, file_dst)
def main():
import sys
main_ex(sys.argv)
if __name__ == "__main__":
main()
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