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