1 files changed, 85 insertions, 0 deletions
diff --git a/scripts/newbitmaps/images/convert_to_bmp3.py b/scripts/newbitmaps/images/convert_to_bmp3.py
new file mode 100755
index 00000000..f5afd33d
--- /dev/null
+++ b/scripts/newbitmaps/images/convert_to_bmp3.py
@@ -0,0 +1,85 @@
+#!/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)