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#!/usr/bin/env python
# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import getopt
import os
import re
import sys
import Image
BACKGROUND_COLOR = (255, 255, 255)
DEFAULT_OUTPUT_EXT = '.bmp'
def parse_scale_factor(pattern, original_size):
# Format: w%xh%, or wxh!
factor = re.findall(r'^([0-9]+)%x([0-9]+)%$', pattern)
if factor:
w, h = factor[0]
return (int(int(w) / 100.0 * original_size[0]),
int(int(h) / 100.0 * original_size[1]))
factor = re.findall(r'^([0-9]+)x([0-9]+)!?$', pattern)
if factor:
return map(int, factor[0])
raise Exception('Unknown scaling parameter: %s', pattern)
def convert_to_bmp(input_file, scale, outdir, background=BACKGROUND_COLOR):
source = Image.open(input_file)
output_file = os.path.join(
outdir,
os.path.basename(input_file).rpartition('.')[0] + DEFAULT_OUTPUT_EXT)
# Process alpha channel and transparency.
if source.mode == 'RGBA':
target = Image.new('RGB', source.size, background)
source.load() # required for source.split()
mask = source.split()[-1]
target.paste(source, mask=mask)
elif (source.mode == 'P') and ('transparency' in source.info):
exit('Sorry, PNG with RGBA palette is not supported.')
elif source.mode != 'RGB':
target = source.convert('RGB')
else:
target = source
# Process scaling
if scale:
new_size = parse_scale_factor(scale, source.size)
target = target.resize(new_size, Image.BICUBIC)
# Export and downsample color space.
target.convert('P', dither=None, palette=Image.ADAPTIVE).save(output_file)
def main(argv):
scale_param = ''
outdir = ''
try:
opts, args = getopt.getopt(argv[1:], '', ('scale=', 'outdir='))
for key, value in opts:
if key == '--scale':
scale_param = value
elif key == '--outdir':
outdir = value
if len(args) < 1:
raise Exception('need more param')
except:
exit('Usage: ' + argv[0] +
' [--scale WxH!|--scale W%xH%] [--outdir DIR] files(s)...')
if outdir and not os.path.isdir(outdir):
os.makedirs(outdir)
for source_file in args:
convert_to_bmp(source_file, scale_param, outdir)
if __name__ == '__main__':
main(sys.argv)
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