1 # -*- coding: utf-8 -*-
2 ##############################################################################
4 # OpenERP, Open Source Management Solution
5 # Copyright (C) 2012-today OpenERP s.a. (<http://openerp.com>).
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU Affero General Public License as
9 # published by the Free Software Foundation, either version 3 of the
10 # License, or (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU Affero General Public License for more details.
17 # You should have received a copy of the GNU Affero General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
20 ##############################################################################
26 from PIL import ImageFilter
27 from random import random
29 # ----------------------------------------
31 # ----------------------------------------
33 def image_resize_image(base64_source, size=(1024, 1024), encoding='base64', filetype='PNG', avoid_if_small=False):
34 """ Function to resize an image. The image will be resized to the given
35 size, while keeping the aspect ratios, and holes in the image will be
36 filled with transparent background. The image will not be stretched if
37 smaller than the expected size.
38 Steps of the resizing:
39 - if avoid_if_small: if both image sizes are smaller than the requested
40 sizes, the original image is returned. This is used to avoid adding
41 transparent content around images that we do not want to alter but
42 just resize if too big. This is used for example when storing images
43 in the 'image' field: we keep the original image, resized to a maximal
44 size, without adding transparent content around it if smaller.
45 - create a thumbnail of the source image through using the thumbnail
46 function. Aspect ratios are preserved when using it. Note that if the
47 source image is smaller than the expected size, it will not be
48 extended, but filled to match the size.
49 - create a transparent background that will hold the final
51 - past the thumbnail on the transparent background and center
54 :param base64_source: base64-encoded version of the source
56 :param size: tuple(height, width)
57 :param encoding: the output encoding
58 :param filetype: the output filetype
59 :param avoid_if_small: do not resize if image height and width
60 are smaller than the expected size.
62 image_stream = io.BytesIO(base64_source.decode(encoding))
63 image = Image.open(image_stream)
64 # check image size: do not create a thumbnail if avoiding smaller images
65 if avoid_if_small and image.size[0] <= size[0] and image.size[1] <= size[1]:
67 # create a thumbnail: will resize and keep ratios
68 image.thumbnail(size, Image.ANTIALIAS)
69 image = image.filter(ImageFilter.SHARPEN)
70 # create a transparent image for background
71 background = Image.new('RGBA', size, (255, 255, 255, 0))
72 # past the resized image on the background
73 background.paste(image, ((size[0] - image.size[0]) / 2, (size[1] - image.size[1]) / 2))
74 # return an encoded image
75 background_stream = StringIO.StringIO()
76 background.save(background_stream, filetype)
77 return background_stream.getvalue().encode(encoding)
79 def image_resize_image_big(base64_source, size=(1204, 1204), encoding='base64', filetype='PNG'):
80 """ Wrapper on image_resize_image, to resize images larger than the standard
81 'big' image size: 1024x1024px.
82 :param base64_source: base64 encoded source image. If False,
83 the function returns False.
87 return image_resize_image(base64_source, size, encoding, filetype, True)
89 def image_resize_image_medium(base64_source, size=(180, 180), encoding='base64', filetype='PNG'):
90 """ Wrapper on image_resize_image, to resize to the standard 'medium'
92 :param base64_source: base64 encoded source image. If False,
93 the function returns False.
97 return image_resize_image(base64_source, size, encoding, filetype)
99 def image_resize_image_small(base64_source, size=(50, 50), encoding='base64', filetype='PNG'):
100 """ Wrapper on image_resize_image, to resize to the standard 'small' image
102 :param base64_source: base64 encoded source image. If False,
103 the function returns False.
105 if not base64_source:
107 return image_resize_image(base64_source, size, encoding, filetype)
109 # ----------------------------------------
111 # ---------------------------------------
113 def image_colorize(original, randomize=True, color=(255, 255, 255)):
114 """ Add a color to the transparent background of an image.
115 :param original: file object on the original image file
116 :param randomize: randomize the background color
117 :param color: background-color, if not randomize
119 # create a new image, based on the original one
120 original = Image.open(io.BytesIO(original))
121 image = Image.new('RGB', original.size)
122 # generate the background color, past it as background
124 color = (int(random() * 192 + 32), int(random() * 192 + 32), int(random() * 192 + 32))
126 image.paste(original, mask=original)
127 # return the new image
128 buffer = StringIO.StringIO()
129 image.save(buffer, 'PNG')
130 return buffer.getvalue()
132 # ----------------------------------------
134 # ---------------------------------------
136 def image_get_resized_images(base64_source, return_big=False, return_medium=True, return_small=True,
137 big_name='image', medium_name='image_medium', small_name='image_small'):
138 """ Standard tool function that returns a dictionary containing the
139 big, medium and small versions of the source image. This function
140 is meant to be used for the methods of functional fields for
143 Default parameters are given to be used for the getter of functional
144 image fields, for example with res.users or res.partner. It returns
145 only image_medium and image_small values, to update those fields.
147 :param base64_source: if set to False, other values are set to False
148 also. The purpose is to be linked to the fields that hold images in
149 OpenERP and that are binary fields.
150 :param return_big: if set, return_dict contains the 'big_name' entry
151 :param return_medium: if set, return_dict contains the 'medium_name' entry
152 :param return_small: if set, return_dict contains the 'small_name' entry
153 :param big_name: name related to the big version of the image;
155 :param medium_name: name related to the medium version of the
156 image; 'image_medium' by default.
157 :param small_name: name related to the small version of the
158 image; 'image_small' by default.
159 :return return_dict: dictionary with resized images, depending on
164 return_dict[big_name] = image_resize_image_big(base64_source)
166 return_dict[medium_name] = image_resize_image_medium(base64_source)
168 return_dict[small_name] = image_resize_image_small(base64_source)