contentdb/app/views/thumbnails.py

72 lines
2.2 KiB
Python
Raw Normal View History

2018-05-29 17:19:17 +02:00
# Content DB
# 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 *
from app import app
2018-07-28 17:03:48 +02:00
import os
2018-05-29 17:19:17 +02:00
from PIL import Image
2018-05-29 17:56:35 +02:00
ALLOWED_RESOLUTIONS=[(350,233)]
2018-05-29 17:19:17 +02:00
def mkdir(path):
if not os.path.isdir(path):
os.mkdir(path)
2018-05-29 17:56:35 +02:00
mkdir("app/public/thumbnails/")
2018-07-28 17:03:48 +02:00
def resize_and_crop(img_path, modified_path, size):
img = Image.open(img_path)
# 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)
2018-05-29 17:19:17 +02:00
@app.route("/thumbnails/<img>")
@app.route("/thumbnails/<int:w>x<int:h>/<img>")
2018-05-29 17:56:35 +02:00
def make_thumbnail(img, w=350, h=233):
2018-05-29 17:19:17 +02:00
if not (w, h) in ALLOWED_RESOLUTIONS:
abort(403)
2018-05-29 17:56:35 +02:00
mkdir("app/public/thumbnails/{}x{}/".format(w, h))
2018-05-29 17:19:17 +02:00
cache_filepath = "public/thumbnails/{}x{}/{}".format(w, h, img)
source_filepath = "public/uploads/" + img
2018-07-28 17:03:48 +02:00
resize_and_crop("app/" + source_filepath, "app/" + cache_filepath, (w, h))
2018-05-29 17:19:17 +02:00
return send_file(cache_filepath)