86 lines
2.5 KiB
Python
86 lines
2.5 KiB
Python
# ContentDB
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# Copyright (C) 2018-21 rubenwardy
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from flask import abort, send_file, Blueprint, current_app
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bp = Blueprint("thumbnails", __name__)
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import os
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from PIL import Image
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ALLOWED_RESOLUTIONS=[(100,67), (270,180), (350,233)]
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def mkdir(path):
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assert path != "" and path is not None
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try:
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if not os.path.isdir(path):
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os.mkdir(path)
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except FileExistsError:
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pass
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def resize_and_crop(img_path, modified_path, size):
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try:
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img = Image.open(img_path)
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except FileNotFoundError:
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abort(404)
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# Get current and desired ratio for the images
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img_ratio = img.size[0] / float(img.size[1])
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ratio = size[0] / float(size[1])
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# Is more portrait than target, scale and crop
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if ratio > img_ratio:
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img = img.resize((int(size[0]), int(size[0] * img.size[1] / img.size[0])),
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Image.BICUBIC)
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box = (0, (img.size[1] - size[1]) / 2, img.size[0], (img.size[1] + size[1]) / 2)
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img = img.crop(box)
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# Is more landscape than target, scale and crop
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elif ratio < img_ratio:
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img = img.resize((int(size[1] * img.size[0] / img.size[1]), int(size[1])),
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Image.BICUBIC)
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box = ((img.size[0] - size[0]) / 2, 0, (img.size[0] + size[0]) / 2, img.size[1])
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img = img.crop(box)
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# Is exactly the same ratio as target
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else:
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img = img.resize(size, Image.BICUBIC)
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img.save(modified_path)
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@bp.route("/thumbnails/<int:level>/<img>")
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def make_thumbnail(img, level):
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if level > len(ALLOWED_RESOLUTIONS) or level <= 0:
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abort(403)
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w, h = ALLOWED_RESOLUTIONS[level - 1]
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upload_dir = current_app.config["UPLOAD_DIR"]
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thumbnail_dir = current_app.config["THUMBNAIL_DIR"]
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mkdir(thumbnail_dir)
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output_dir = os.path.join(thumbnail_dir, str(level))
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mkdir(output_dir)
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cache_filepath = os.path.join(output_dir, img)
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source_filepath = os.path.join(upload_dir, img)
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resize_and_crop(source_filepath, cache_filepath, (w, h))
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return send_file(cache_filepath)
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