optimize-ico-files: Move the logic for this script into a module.

tools/resources/ico_tools.py

-#!/usr/bin/env python
 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-"""Windows ICO file crusher.
-
-Optimizes the PNG images within a Windows ICO icon file. This extracts all of
-the sub-images within the file, runs any PNG-formatted images through
-optimize-png-files.sh, then packs them back into an ICO file.
-
-NOTE: ICO files can contain both raw uncompressed BMP files and PNG files. This
-script does not touch the BMP files, which means if you have a huge uncompressed
-image, it will not get smaller. 256x256 icons should be PNG-formatted first.
-(Smaller icons should be BMPs for compatibility with Windows XP.)
-"""
-
-import argparse
 import logging
 import math
 import os
-import StringIO
 import struct
 import subprocess
 import sys
 import tempfile
 
 OPTIMIZE_PNG_FILES = 'tools/resources/optimize-png-files.sh'
 
 logging.basicConfig(level=logging.INFO, format='%(levelname)s: %(message)s')
 
 class InvalidFile(Exception):
@@ skipping 175 matching lines @@
     icon_dir_entries[i] = (width % 256, height % 256, num_colors, r1, r2, r3,
                            new_size, offset)
     icon_bitmap_data.append(icon_data)
 
   # Write the data back to outfile.
   outfile.write(icondir)
   for icon_dir_entry in icon_dir_entries:
     outfile.write(struct.pack('<BBBBHHLL', *icon_dir_entry))
   for icon_bitmap in icon_bitmap_data:
     outfile.write(icon_bitmap)
-
-def main(args=None):
-  if args is None:
-    args = sys.argv[1:]
-
-  parser = argparse.ArgumentParser(description='Crush Windows ICO files.')
-  parser.add_argument('files', metavar='ICO', type=argparse.FileType('r+b'),
-                      nargs='+', help='.ico files to be crushed')
-  parser.add_argument('-o', dest='optimization_level', metavar='OPT', type=int,
-                      help='optimization level')
-  parser.add_argument('-d', '--debug', dest='debug', action='store_true',
-                      help='enable debug logging')
-
-  args = parser.parse_args()
-
-  if args.debug:
-    logging.getLogger().setLevel(logging.DEBUG)
-
-  for file in args.files:
-    buf = StringIO.StringIO()
-    file.seek(0, os.SEEK_END)
-    old_length = file.tell()
-    file.seek(0, os.SEEK_SET)
-    OptimizeIcoFile(file, buf, args.optimization_level)
-
-    new_length = len(buf.getvalue())
-
-    # Always write (even if file size not reduced), because we make other fixes
-    # such as regenerating the AND mask.
-    file.truncate(new_length)
-    file.seek(0)
-    file.write(buf.getvalue())
-
-    if new_length >= old_length:
-      logging.info('%s : Could not reduce file size.', file.name)
-    else:
-      saving = old_length - new_length
-      saving_percent = float(saving) / old_length
-      logging.info('%s : %d => %d (%d bytes : %d %%)', file.name, old_length,
-                   new_length, saving, int(saving_percent * 100))
-
-if __name__ == '__main__':
-  sys.exit(main())