Mercurial > public > sg101
view gpp/core/image.py @ 504:b5bd3509e6e6
Made some tweaks to the ajax login javascript.
Cleared the inputs on failure so someone won't repeatedly try a bad login.
Redirect on lockout so the page will refresh.
Set focus on the username box after failure for convenience.
author | Brian Neal <bgneal@gmail.com> |
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date | Sat, 03 Dec 2011 16:25:15 +0000 |
parents | 1ba2c6bf6eb7 |
children |
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""" This file contains common utility functions for manipulating images for the rest of the applications in the project. """ from PIL import ImageFile from PIL import Image def parse_image(file): """ Returns a PIL Image from the supplied Django file object. Throws IOError if the file does not parse as an image file or some other I/O error occurred. """ parser = ImageFile.Parser() for chunk in file.chunks(): parser.feed(chunk) image = parser.close() return image def downscale_image_square(image, size): """ Scale an image to the square dimensions given by size (in pixels). The new image is returned. If the image is already smaller than (size, size) then no scaling is performed and the image is returned unchanged. """ # don't upscale if (size, size) >= image.size: return image (w, h) = image.size if w > h: diff = (w - h) / 2 image = image.crop((diff, 0, w - diff, h)) elif h > w: diff = (h - w) / 2 image = image.crop((0, diff, w, h - diff)) image = image.resize((size, size), Image.ANTIALIAS) return image