162 lines
4.3 KiB
Python
Executable File
162 lines
4.3 KiB
Python
Executable File
#!/usr/bin/env python3
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# ##### BEGIN GPL LICENSE BLOCK #####
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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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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# ##### END GPL LICENSE BLOCK #####
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# <pep8 compliant>
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_IS_BIG_ENDIAN = (__import__("sys").byteorder != 'little')
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def write_png(buf, width, height):
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import zlib
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import struct
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# reverse the vertical line order and add null bytes at the start
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width_byte_4 = width * 4
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raw_data = b"".join(
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b'\x00' + buf[span:span + width_byte_4]
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for span in range((height - 1) * width * 4, -1, - width_byte_4)
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)
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def png_pack(png_tag, data):
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chunk_head = png_tag + data
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return struct.pack("!I", len(data)) + chunk_head + struct.pack("!I", 0xFFFFFFFF & zlib.crc32(chunk_head))
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return b"".join([
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b'\x89PNG\r\n\x1a\n',
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png_pack(b'IHDR', struct.pack("!2I5B", width, height, 8, 6, 0, 0, 0)),
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png_pack(b'IDAT', zlib.compress(raw_data, 9)),
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png_pack(b'IEND', b'')])
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def icon_decode_head(f_src):
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import struct
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# 2 ints
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temp_data = f_src.read(4 * 2)
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icon_w, icon_h = struct.unpack('<2I', temp_data)
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temp_data = f_src.read(4 * 2)
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orig_x, orig_y = struct.unpack('<2I', temp_data)
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temp_data = f_src.read(4 * 2)
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canvas_w, canvas_h = struct.unpack('<2I', temp_data)
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return (icon_w, icon_h,
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orig_x, orig_y,
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canvas_w, canvas_h)
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def icon_decode(f_src):
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head = icon_decode_head(f_src)
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(icon_w, icon_h,
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orig_x, orig_y,
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canvas_w, canvas_h) = head
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# pixels
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import array
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pixels = f_src.read(icon_w * icon_h * 4)
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pixels = array.array('I', pixels)
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if _IS_BIG_ENDIAN:
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pixels.byteswap()
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return head, pixels
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def icon_read(file_src):
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with open(file_src, 'rb') as f_src:
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head, pixels = icon_decode(f_src)
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return head, pixels
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def icon_merge(file_src, pixels_canvas, canvas_w, canvas_h):
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""" Takes an icon filepath and merges into a pixel array
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"""
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head, pixels = icon_read(file_src)
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(icon_w, icon_h,
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orig_x, orig_y,
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w_canvas_test, h_canvas_test) = head
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assert(w_canvas_test == canvas_w)
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assert(h_canvas_test == canvas_h)
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for x in range(icon_w):
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for y in range(icon_h):
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# get pixel
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pixel = pixels[(y * icon_w) + x]
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# set pixel
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dst_x = orig_x + x
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dst_y = orig_y + y
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pixels_canvas[(dst_y * canvas_w) + dst_x] = pixel
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def icondir_to_png(path_src, file_dst):
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""" Takes a path full of 'dat' files and writes out
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"""
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import os
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import array
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files = [os.path.join(path_src, f) for f in os.listdir(path_src) if f.endswith(".dat")]
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# First check if we need to bother.
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if os.path.exists(file_dst):
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dst_time = os.path.getmtime(file_dst)
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has_newer = False
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for f in files:
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if os.path.getmtime(f) > dst_time:
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has_newer = True
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break
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if not has_newer:
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return
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with open(files[0], 'rb') as f_src:
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(icon_w, icon_h,
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orig_x, orig_y,
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canvas_w, canvas_h) = icon_decode_head(f_src)
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# load in pixel data
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pixels_canvas = array.array('I', [0]) * (canvas_w * canvas_h)
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for f in files:
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icon_merge(f, pixels_canvas, canvas_w, canvas_h)
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# write pixels
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with open(file_dst, 'wb') as f_dst:
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pixels_data = pixels_canvas.tobytes()
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image_data = write_png(pixels_data, canvas_w, canvas_h)
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f_dst.write(image_data)
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def main_ex(argv):
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import os
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path_src = argv[-2].rstrip(os.sep)
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file_dst = argv[-1]
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icondir_to_png(path_src, file_dst)
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def main():
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import sys
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main_ex(sys.argv)
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if __name__ == "__main__":
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main()
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