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# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
try:
from PIL import Image
from PIL import ImageFont
from PIL import ImageDraw
except ImportError:
import Image
import ImageFont
import ImageDraw
import logging
import pkg_resources
import os
_log = logging.getLogger(__name__)
class AsciiToImage:
'''
Converter of ASCII art into image files, preserving whitespace
kwargs:
- font: Path to font file
default: fonts/Inconsolata.otf
- font_size: Font size, ``int``
default: 11
'''
def __init__(self, **kw):
self._font = kw.get('font', pkg_resources.resource_filename(
'mediagoblin.media_types.ascii',
os.path.join('fonts', 'Inconsolata.otf')))
self._font_size = kw.get('font_size', 11)
self._if = ImageFont.truetype(
self._font,
self._font_size,
encoding='unic')
_log.info('Font set to {}, size {}'.format(
self._font,
self._font_size))
# ,-,-^-'-^'^-^'^-'^-.
# ( I am a wall socket )Oo, ___
# `-.,.-.,.-.-.,.-.--' ' `
# Get the size, in pixels of the '.' character
self._if_dims = self._if.getsize('.')
# `---'
def convert(self, text, destination):
# TODO: Detect if text is a file-like, if so, act accordingly
im = self._create_image(text)
# PIL's Image.save will handle both file-likes and paths
if im.save(destination):
_log.info('Saved image in {}'.format(
destination))
def _create_image(self, text):
'''
Write characters to a PIL image canvas.
TODO:
- Character set detection and decoding,
http://pypi.python.org/pypi/chardet
'''
_log.debug('Drawing image')
# Convert the input from str to unicode
text = text.decode('utf-8')
# TODO: Account for alternative line endings
lines = text.split('\n')
line_lengths = [len(i) for i in lines]
# Calculate destination size based on text input and character size
im_dims = (
max(line_lengths) * self._if_dims[0],
len(line_lengths) * self._if_dims[1])
_log.info('Destination image dimensions will be {}'.format(
im_dims))
im = Image.new(
'RGBA',
im_dims,
(255, 255, 255, 0))
draw = ImageDraw.Draw(im)
char_pos = [0, 0]
for line in lines:
line_length = len(line)
_log.debug(f'Writing line at {char_pos}')
for _pos in range(0, line_length):
char = line[_pos]
px_pos = self._px_pos(char_pos)
_log.debug('Writing character "{}" at {} (px pos {})'.format(
char.encode('ascii', 'replace'),
char_pos,
px_pos))
draw.text(
px_pos,
char,
font=self._if,
fill=(0, 0, 0, 255))
char_pos[0] += 1
# Reset X position, increment Y position
char_pos[0] = 0
char_pos[1] += 1
return im
def _px_pos(self, char_pos):
'''
Helper function to calculate the pixel position based on
character position and character dimensions
'''
px_pos = [0, 0]
for index, val in zip(range(0, len(char_pos)), char_pos):
px_pos[index] = char_pos[index] * self._if_dims[index]
return px_pos
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