annotate gpp/core/image.py @ 429:d0f0800eef0c
Making the jquery tabbed version of the messages app the current version and removing the old. Also figured out how to dynamically update the base template's count of unread messages when messages are read.
| author |
Brian Neal <bgneal@gmail.com> |
| date |
Tue, 03 May 2011 02:56:58 +0000 |
| parents |
1ba2c6bf6eb7 |
| children |
|
| rev |
line source |
|
bgneal@265
|
1 """
|
|
bgneal@265
|
2 This file contains common utility functions for manipulating images for
|
|
bgneal@265
|
3 the rest of the applications in the project.
|
|
bgneal@265
|
4 """
|
|
bgneal@265
|
5 from PIL import ImageFile
|
|
bgneal@265
|
6 from PIL import Image
|
|
bgneal@265
|
7
|
|
bgneal@265
|
8
|
|
bgneal@265
|
9 def parse_image(file):
|
|
bgneal@265
|
10 """
|
|
bgneal@265
|
11 Returns a PIL Image from the supplied Django file object.
|
|
bgneal@265
|
12 Throws IOError if the file does not parse as an image file or some other
|
|
bgneal@265
|
13 I/O error occurred.
|
|
bgneal@265
|
14
|
|
bgneal@265
|
15 """
|
|
bgneal@265
|
16 parser = ImageFile.Parser()
|
|
bgneal@265
|
17 for chunk in file.chunks():
|
|
bgneal@265
|
18 parser.feed(chunk)
|
|
bgneal@265
|
19 image = parser.close()
|
|
bgneal@265
|
20 return image
|
|
bgneal@265
|
21
|
|
bgneal@265
|
22
|
|
bgneal@265
|
23 def downscale_image_square(image, size):
|
|
bgneal@265
|
24 """
|
|
bgneal@265
|
25 Scale an image to the square dimensions given by size (in pixels).
|
|
bgneal@265
|
26 The new image is returned.
|
|
bgneal@265
|
27 If the image is already smaller than (size, size) then no scaling
|
|
bgneal@265
|
28 is performed and the image is returned unchanged.
|
|
bgneal@265
|
29
|
|
bgneal@265
|
30 """
|
|
bgneal@265
|
31 # don't upscale
|
|
bgneal@265
|
32 if (size, size) >= image.size:
|
|
bgneal@265
|
33 return image
|
|
bgneal@265
|
34
|
|
bgneal@265
|
35 (w, h) = image.size
|
|
bgneal@265
|
36 if w > h:
|
|
bgneal@265
|
37 diff = (w - h) / 2
|
|
bgneal@265
|
38 image = image.crop((diff, 0, w - diff, h))
|
|
bgneal@265
|
39 elif h > w:
|
|
bgneal@265
|
40 diff = (h - w) / 2
|
|
bgneal@265
|
41 image = image.crop((0, diff, w, h - diff))
|
|
bgneal@265
|
42 image = image.resize((size, size), Image.ANTIALIAS)
|
|
bgneal@265
|
43 return image
|
