annotate gpp/core/image.py @ 318:c550933ff5b6
Fix a bug where you'd get an error when trying to delete a forum thread (topic does not exist). Apparently when you call topic.delete() the posts would get deleted, but the signal handler for each one would run, and it would try to update the topic's post count or something, but the topic was gone? Reworked the code a bit and explicitly delete the posts first. I also added a sync() call on the parent forum since post counts were not getting adjusted.
| author |
Brian Neal <bgneal@gmail.com> |
| date |
Sat, 05 Feb 2011 21:46:52 +0000 |
| parents |
1ba2c6bf6eb7 |
| children |
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| rev |
line source |
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bgneal@265
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1 """
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2 This file contains common utility functions for manipulating images for
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3 the rest of the applications in the project.
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4 """
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5 from PIL import ImageFile
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6 from PIL import Image
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7
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8
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9 def parse_image(file):
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10 """
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11 Returns a PIL Image from the supplied Django file object.
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12 Throws IOError if the file does not parse as an image file or some other
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13 I/O error occurred.
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14
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15 """
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16 parser = ImageFile.Parser()
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17 for chunk in file.chunks():
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18 parser.feed(chunk)
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19 image = parser.close()
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20 return image
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21
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22
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23 def downscale_image_square(image, size):
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24 """
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25 Scale an image to the square dimensions given by size (in pixels).
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26 The new image is returned.
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27 If the image is already smaller than (size, size) then no scaling
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28 is performed and the image is returned unchanged.
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29
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30 """
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31 # don't upscale
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32 if (size, size) >= image.size:
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33 return image
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34
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35 (w, h) = image.size
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36 if w > h:
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37 diff = (w - h) / 2
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38 image = image.crop((diff, 0, w - diff, h))
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39 elif h > w:
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40 diff = (h - w) / 2
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41 image = image.crop((0, diff, w, h - diff))
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42 image = image.resize((size, size), Image.ANTIALIAS)
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43 return image
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