567b23e171
When building the font, images are composited onto a slightly rectangular canvas that's 4 pixels wider on the left and right. The thumbnails though are required to be 72x72, i.e. square. In order that they look the intended size we need to crop off the margins that were added earlier.
160 lines
5.1 KiB
Python
Executable File
160 lines
5.1 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright 2017 Google Inc. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Generate 72x72 thumbnails including aliases.
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Takes a source directory of images named using our emoji filename
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conventions and writes thumbnails of them into the destination
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directory. If a file is a target of one or more aliases, creates
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copies named for the aliases."""
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import argparse
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import collections
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import logging
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import os
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from os import path
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import shutil
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import subprocess
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import add_aliases
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from nototools import tool_utils
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from nototools import unicode_data
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logger = logging.getLogger('emoji_thumbnails')
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def create_thumbnail(src_path, dst_path, crop):
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# Uses imagemagik
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# We need images exactly 72x72 in size, with transparent background.
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# Remove 4-pixel LR margins from 136x128 source images if we crop.
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if crop:
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cmd = [
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'convert', src_path, '-crop', '128x128+4+0!', '-thumbnail', '72x72',
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'PNG32:' + dst_path]
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else:
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cmd = [
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'convert', '-thumbnail', '72x72', '-gravity', 'center', '-background',
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'none', '-extent', '72x72', src_path, 'PNG32:' + dst_path]
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subprocess.check_call(cmd)
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def get_inv_aliases():
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"""Return a mapping from target to list of sources for all alias
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targets in either the default alias table or the unknown_flag alias
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table."""
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inv_aliases = collections.defaultdict(list)
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standard_aliases = add_aliases.read_default_emoji_aliases()
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for k, v in standard_aliases.iteritems():
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inv_aliases[v].append(k)
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unknown_flag_aliases = add_aliases.read_emoji_aliases(
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'unknown_flag_aliases.txt')
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for k, v in unknown_flag_aliases.iteritems():
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inv_aliases[v].append(k)
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return inv_aliases
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def filename_to_sequence(filename, prefix, suffix):
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if not filename.startswith(prefix) and filename.endswith(suffix):
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raise ValueError('bad prefix or suffix: "%s"' % filename)
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seq_str = filename[len(prefix): -len(suffix)]
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seq = unicode_data.string_to_seq(seq_str)
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if not unicode_data.is_cp_seq(seq):
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raise ValueError('sequence includes non-codepoint: "%s"' % filename)
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return seq
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def sequence_to_filename(seq, prefix, suffix):
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return ''.join((prefix, unicode_data.seq_to_string(seq), suffix))
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def create_thumbnails_and_aliases(src_dir, dst_dir, crop, dst_prefix):
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"""Creates thumbnails in dst_dir based on sources in src.dir, using
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dst_prefix. Assumes the source prefix is 'emoji_u' and the common suffix
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is '.png'."""
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src_dir = tool_utils.resolve_path(src_dir)
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if not path.isdir(src_dir):
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raise ValueError('"%s" is not a directory')
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dst_dir = tool_utils.ensure_dir_exists(tool_utils.resolve_path(dst_dir))
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src_prefix = 'emoji_u'
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suffix = '.png'
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inv_aliases = get_inv_aliases()
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for src_file in os.listdir(src_dir):
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try:
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seq = unicode_data.strip_emoji_vs(
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filename_to_sequence(src_file, src_prefix, suffix))
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except ValueError as ve:
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logger.warning('Error (%s), skipping' % ve)
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continue
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src_path = path.join(src_dir, src_file)
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dst_file = sequence_to_filename(seq, dst_prefix, suffix)
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dst_path = path.join(dst_dir, dst_file)
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create_thumbnail(src_path, dst_path, crop)
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logger.info('wrote thumbnail%s: %s' % (
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' with crop' if crop else '', dst_file))
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for alias_seq in inv_aliases.get(seq, ()):
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alias_file = sequence_to_filename(alias_seq, dst_prefix, suffix)
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alias_path = path.join(dst_dir, alias_file)
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shutil.copy2(dst_path, alias_path)
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logger.info('wrote alias: %s' % alias_file)
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def main():
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SRC_DEFAULT = '[emoji]/build/compressed_pngs'
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PREFIX_DEFAULT = 'android_'
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parser = argparse.ArgumentParser()
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parser.add_argument(
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'-s', '--src_dir', help='source images (default \'%s\')' % SRC_DEFAULT,
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default=SRC_DEFAULT, metavar='dir')
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parser.add_argument(
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'-d', '--dst_dir', help='destination directory', metavar='dir',
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required=True)
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parser.add_argument(
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'-p', '--prefix', help='prefix for thumbnail (default \'%s\')' %
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PREFIX_DEFAULT, default=PREFIX_DEFAULT, metavar='str')
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parser.add_argument(
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'-c', '--crop', help='crop images (will automatically crop if '
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'src dir is the default)', action='store_true')
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parser.add_argument(
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'-v', '--verbose', help='write log output', metavar='level',
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choices='warning info debug'.split(), const='info',
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nargs='?')
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args = parser.parse_args()
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if args.verbose is not None:
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logging.basicConfig(level=getattr(logging, args.verbose.upper()))
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crop = args.crop or (args.src_dir == SRC_DEFAULT)
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create_thumbnails_and_aliases(
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args.src_dir, args.dst_dir, crop, args.prefix)
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if __name__ == '__main__':
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main()
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