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# ContentDB
# Copyright (C) 2018 rubenwardy
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
from flask import abort, send_file, Blueprint, current_app
bp = Blueprint("thumbnails", __name__)
import os
from PIL import Image
ALLOWED_RESOLUTIONS=[(100,67), (270,180), (350,233)]
def mkdir(path):
assert path != "" and path is not None
try:
if not os.path.isdir(path):
os.mkdir(path)
except FileExistsError:
pass
def resize_and_crop(img_path, modified_path, size):
try:
img = Image.open(img_path)
except FileNotFoundError:
abort(404)
# Get current and desired ratio for the images
img_ratio = img.size[0] / float(img.size[1])
ratio = size[0] / float(size[1])
# Is more portrait than target, scale and crop
if ratio > img_ratio:
img = img.resize((int(size[0]), int(size[0] * img.size[1] / img.size[0])),
Image.BICUBIC)
box = (0, (img.size[1] - size[1]) / 2, img.size[0], (img.size[1] + size[1]) / 2)
img = img.crop(box)
# Is more landscape than target, scale and crop
elif ratio < img_ratio:
img = img.resize((int(size[1] * img.size[0] / img.size[1]), int(size[1])),
Image.BICUBIC)
box = ((img.size[0] - size[0]) / 2, 0, (img.size[0] + size[0]) / 2, img.size[1])
img = img.crop(box)
# Is exactly the same ratio as target
else:
img = img.resize(size, Image.BICUBIC)
img.save(modified_path)
@bp.route("/thumbnails/<int:level>/<img>")
def make_thumbnail(img, level):
if level > len(ALLOWED_RESOLUTIONS) or level <= 0:
abort(403)
w, h = ALLOWED_RESOLUTIONS[level - 1]
upload_dir = current_app.config["UPLOAD_DIR"]
thumbnail_dir = current_app.config["THUMBNAIL_DIR"]
mkdir(thumbnail_dir)
output_dir = os.path.join(thumbnail_dir, str(level))
mkdir(output_dir)
cache_filepath = os.path.join(output_dir, img)
source_filepath = os.path.join(upload_dir, img)
resize_and_crop(source_filepath, cache_filepath, (w, h))
return send_file(cache_filepath)
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